HomeMy WebLinkAbout2020-07-21; City Council; ; Continued to July 28, 2020-Americans with Disabilities Act Beach Access Feasibility Study and Trail Connectivity to Tamarack State Beach Feasibility StudyJuly 21, 2020
7. AMERICANS WITH DISABILITIES ACT BEACH ACCESS FEASIBILITY STUDY AND TRAIL
CONNECTIVITY TO TAMARACK STATE BEACH FEASIBILITY STUDY — Adoption of a
resolution accepting the Americans with Disabilities Act Beach Access Feasibility Study
and the Trail Connectivity to Tamarack State Beach Feasibility Study, including the
corresponding concept plans, and directing staff to prepare a request for proposals to
pursue the environmental review, agency permitting, engineering and construction
documentation phases of the projects. (Staff contact: Kyle Lancaster, Parks & Recreation
and Nathan Schmidt, Public Works)
THIS ITEM WAS
CONTINUED TO THE
JULY 28, 2020
CITY COUNCIL
MEETING.
CITY COUNCIL
Staff Report
CA Review AF
Meeting Date: July 21, 2020
To: Mayor and City Council
From: Scott Chadwick, City Manager
Staff Contact: Kyle Lancaster, Parks & Recreation Director
kyle.lancaster@carlsbadca.gov, 760-434-2941
Nathan Schmidt, Transportation Planning and Mobility Manager
nathan.schmidt@carlsbadca.gov, 760-602-2734
Subject: Americans with Disabilities Act Beach Access Feasibility Study and
Trail Connectivity to Tamarack State Beach Feasibility Study.
Recommended Action
Adopt a resolution receiving and accepting the Americans with Disabilities Act (ADA) Beach
Access Feasibility Study and the Trail Connectivity to Tamarack State Beach Feasibility Study,
including the corresponding concept plans, and directing staff to prepare a request for
proposals to pursue the environmental review, agency permitting, engineering and
construction documentation phases of the projects.
Executive Summary
On July 24, 2018, the City Council adopted a resolution authorizing the execution of a
Professional Services Agreement with Chen Ryan for the preparation of feasibility studies for
the ADA Beach Access Project, Capital Improvement Program (CIP) Project No. 6065, and the
Trail Connectivity to Tamarack State Beach Project, CIP Project No. 4063 (City Council
Resolution No. 2018-14). As referenced in the July 24, 2018 staff report (Exhibit 2), the studies
were to examine the feasibility of constructing ADA-accessible ramps from Carlsbad Boulevard
to the beach, as well as the feasibility of a trail connection from the North Shore Agua Hedionda
Lagoon Trail to the Tamarack State Beach.
The ADA Beach Access Feasibility Study evaluated five alternatives using criteria established by
the project team. The project team goals were to develop up to two preferred alternatives for
ADA access to the beach. The two preferred alternatives selected for this purpose are located
north of Pine Avenue and at the Tamarack Avenue restroom. Staff is recommending pursuing
the environmental review, agency permitting, engineering and construction documentation
phases on both preferred alternatives, to provide ADA access at each end of the lower sea wall.
The Trail Connectivity to Tamarack State Beach Feasibility Study evaluated the feasibility of
constructing a tunnel or undercrossing to connect the North Shore Agua Hedionda Lagoon Trail
to Tamarack State Beach. The study evaluated five alternatives to determine the engineering
feasibility, which took into consideration factors such as terrain, sea level rise and
July 21, 2020 Item #7 Page 1 of 157
constructability. The study found the cut-and-cover tunnel' was the most feasible alternative to
connect the North Shore Agua Hedionda Lagoon Trail to Tamarack State Beach. Staff is
recommending pursuing the environmental review, agency permitting, engineering and
construction documentation phases for the cut-and-cover tunnel alternative.
Staff is therefore recommending the City Council accept the ADA Beach Access Feasibility Study
and the Trail Connectivity to Tamarack State Beach Feasibility Study, including the
corresponding concept plans, and direct staff to prepare a request for proposals to pursue the
next phases of the projects, including environmental review, agency permitting, engineering
and construction documentation for each project.
Discussion
This report transmits the ADA Beach Access Feasibility Study and the Trail Connectivity to
Tamarack State Beach Feasibility Study, including a review of the existing conditions, study
approach, community and stakeholder outreach, alternatives analysis and results of each study,
as well as the state agency and city commissions' review of and comment on each study.
Community and stakeholder outreach
The development of both the ADA Access Feasibility Study and the Trail Connectivity to
Tamarack State Beach Feasibility Study involved a public outreach process to help inform the
final recommendations. In particular, the combined team of Public Works Branch staff, Parks &
Recreation Department staff, and the integrated transportation and use planning consultant
staff conducted community and stakeholder outreach to help identify the level of support for
these projects. These events included a stakeholder group meeting held on Thursday, Nov. 15,
2018 and a follow-up stakeholder group meeting on Wednesday, Aug. 28, 2019. Additionally,
staff held on-site "pop-up" events on Friday, Nov. 16, 2018 and Saturday, Nov. 17, 2018, to
gather further community input.
The project stakeholder group consisted of residents and business owners from the
surrounding area, with many of the meeting participants being wheelchair users who lived
within Carlsbad Village. The two pop-up events were held along Carlsbad Boulevard, near the
beach. The first was held on a Friday afternoon at the Ocean Street Sculpture Park, north of
Pine Avenue, and the second event was held on a Saturday morning at the Tamarack State
Beach upper picnic area, north of Tamarack Avenue.
Throughout the public outreach process, participants expressed the view that Carlsbad Village
is great for wheelchair users due to the generally flat topography. The overwhelming consensus
of participants was that the preferred location for ADA access to the beach would be near Pine
Avenue, due to its proximity to Carlsbad Village. ADA access at Tamarack Avenue was identified
as an additional location, but only if more than one ramp could be built, because of the high
levels of pedestrian activity and available amenities at Tamarack State Beach.
'Cut-and-cover is a means of constructing shallow tunnels in which a trench is excavated and roofed over with
material strong enough to carry the load of what is above the tunnel.
July 21, 2020 Item #7 Page 2 of 157
ADA Beach Access Feasibility Study
The primary objective of the ADA Beach Access Feasibility Study was to evaluate the feasibility
of constructing one or more ADA-compliant pedestrian walkways and access ramps from
Carlsbad Boulevard to the beach between the parking lot just north of Pine Avenue to the cold-
water inlet bridge just south of Tamarack Avenue. At the north end of the project, near Pine
Avenue, the roadway is about 30 feet above the beach while, at the south end, the roadway is
about 12 feet above the parking lot at Tamarack State Beach.
Pedestrian access to the beach is currently provided via six stairways and two non-ADA
compliant ramps. Vehicular access is provided as an extension of Pine Avenue to Frazee State
Beach and of Tamarack Avenue to Tamarack State Beach. The slopes of the two ramps at Pine
Avenue and at Tamarack Avenue, 15.6% and 9.9% respectively, exceed the allowable ADA
slopes without landings. The maximum allowable slope of ramps for full ADA compliance is 8%.
Taking into account the existing use of the access, community input, an analysis of vegetation
constraints and an engineering evaluation, all described in the feasibility study, the following
five alternative ramp locations were identified for further evaluation:
1. North of Pine Avenue
2. At Pine Avenue
3. At Cherry Street
4. At the Tamarack Avenue restroom
5. South of the Tamarack Avenue Access Road
The evaluation criteria used to select the preferred ramp locations from the five alternative
locations was based on the following 10 criteria, as developed by the project team:
1. Usage and demand
2. Safety and convenience
3. Construction feasibility and complexity
4. California Coastal Commission acceptance
5. Aesthetics
6. Public input
7. State Parks' concurrence
8. Vulnerability
9. Biological resources
10. Geotechnical and geological issues
A detailed evaluation was conducted of the five locations, and the two preferred alternative
locations were determined to be North of Pine Avenue and at the Tamarack Avenue restroom.
Here is how the five locations ranked, with summaries of the evaluations:
1. North of Pine Avenue - Preferred Alternative 1: This location scored highest across all
criteria except for criterion 8, vulnerability. This location may be vulnerable to sea level
July 21, 2020 Item #7 Page 3 of 157
rise and storm damage because the end of the walkway ramp is at grade and not
sheltered by shoreline protection. However, some of the existing rip-rap, or boulders, at
the end of the ramp could be relocated to address this deficiency. In addition, the
community and project stakeholders indicated that their most ideal location for ADA
access would be near Pine Avenue because it is closer to Carlsbad Village than the
proposed locations further south.
2. Pine Avenue: This location ranked third, scoring lower than the one north of Pine
Avenue because of the complexity of constructing the ramp in the narrow area between
the existing restroom and the upper sea wall walkway. It would also result in greater
impacts to biological resources and require landform alterations at the end of the ramp.
3. Cherry Street: This location resulted in the lowest score, scoring poorly on the criteria of
usage and demand, safety and convenience, and public input.
4. Tamarack Avenue Restroom - Preferred Alternative 2: This alternative location scored
second highest overall. The project stakeholders also indicated that this location would
be preferred if more than one ramp could be constructed, that is, in addition to the
north of Pine Avenue location.
5. South of Tamarack Avenue Access Road: This alternative scored fourth, scoring lower
than the Tamarack Avenue Restroom location due to sea level rise and storm damage
vulnerability because the walkway would not land behind the lower sea wall. This
location also scored low in regard to safety and convenience, as the walkway would
cross the vehicle drive aisle to access the beach and would not allow for ADA access to
the existing restroom.
The Pine Avenue ramp project would involve constructing an ADA-compliant ramp that would
begin at the parking lot north of the intersection of Pine Avenue and Carlsbad Boulevard. The
389-foot ramp would change direction once, extending the pathway southward along the
bluffs. The ramp would be designed with an incline of 7.8%. The ramp would be elevated as it
descends the bluff, ranging between distances of approximately two to nine feet above the
existing bluff below.
The proposed ramp at the Tamarack Avenue restroom would begin at the top of the bluff near
the existing showers and restrooms and would extend southward, parallel to the existing access
road to the Tamarack State Beach parking lot. The existing access road and walkway south of
the proposed ramp would remain in its current state. Additionally, the existing staircase located
perpendicular to the new ramp would be reconstructed. A portion of the ramp, approximately
60%, would be elevated along the bluff, ranging between two and five feet above the existing
bluff. The ramp would be 196 feet in length and have an incline of 7.5%. The existing ramp to
the restrooms would also be rebuilt to be ADA compliant. The proposed design of the Tamarack
Avenue ramp utilizes existing access points and disturbed areas to minimize impacts to the
undisturbed areas of the bluff.
July 21, 2020 Item #7 Page 4 of 157
Conceptual design plans, photo simulations and potential materials of the two preferred
alternative locations are displayed in Figures 3 through 8 of the study and provided as a
separate attachment. Staff recommends issuing a request for proposals to pursue the
environmental review, agency permitting, engineering and construction documentation phases
of both preferred alternatives, to provide ADA access to each end of the lower sea wall, which
is designated as a city trail.
Trail Connectivity to Tamarack State Beach Feasibility Study
The Trail Connectivity to Tamarack State Beach Project would be located at the cold-water inlet
bridge on Carlsbad Boulevard, south of Tamarack Avenue. The study's main objective was to
evaluate the feasibility of constructing a pedestrian tunnel or undercrossing to connect the
North Shore Agua Hedionda Lagoon Trail to Tamarack State Beach and to develop the preferred
alternative. This trail connectivity is also consistent with the goals of the City of Carlsbad's Trails
Master Plan.
Five alternatives were considered to provide a trail connection close to the cold-water inlet.
The project team initially thought the crossing could be underneath the existing bridge or under
the existing road, north of the bridge. An overcrossing alternative was not considered due to
the significant visual impacts that an elevated bridge structure would present. The following
alternatives were considered for a trail connection at the north side of the existing bridge:
1. Pedestrian bridge: This alternative would be located beneath the existing Carlsbad
Boulevard bridge and would be supported on a pile foundation in front of the northern
abutment. This option was considered infeasible because it would provide a maximum
vertical clearance of 12.18 feet and would not meet the minimum required vertical
clearance threshold of 12.5 feet.
2. Open walkway: This alternative would be located on a retaining wall beneath the
Carlsbad Boulevard bridge. This option was determined to be infeasible due to potential
hydraulic impacts and the requirement for deep foundations and walkway closures
during storm events.
3. Walled walkway: This alternative is similar to the open walkway, but it would include
walls to prevent water from entering the walkway. This alternative was determined to
be not preferable due to the higher hydraulic impacts than the open walkway, the
extensive foundations required for the wall and the need for closure during storm
events.
4. Tunnel: This alternative would construct a standard tunnel underneath Carlsbad
Boulevard. A tunnel typically requires a cover that is twice its diameter. To provide a
nine-foot overhead clearance, which is the minimum clearance requested by the city for
a closed crossing, the tunnel would need to be approximately 30 feet below ground,
would be located beneath the required water surface elevation and would be prone to
continual flooding due to the proximity of the lagoon.
July 21, 2020 Item 1*7 Page 5 of 157
5. Cut and-cover— Preferred Alternative: This alternative would be similar to the tunnel
and would also be underneath Carlsbad Boulevard; however, the trench excavation
would be much shallower, as the earth cover can be as shallow as 12 inches. The project
team found this alternative to be the most feasible option for crossing at this location
considering the design limitations of the other alternatives.
As described above, the cut-and-cover tunnel was found to be the most feasible option to
connect the North Shore Agua Hedionda Lagoon Trail and Tamarack State Beach. This
alternative would consist of a single precast reinforced concrete box culvert crossing under
Carlsbad Boulevard, north of the existing Carlsbad Boulevard Bridge. The proposed structure
would be built using accelerated bridge construction methods to minimize potential disruptions
to traffic and nearby residents.
The completed cut-and-cover tunnel structure would be 92.5 feet long and 12 feet wide and
nine feet high, following the same alignment of the existing Carlsbad Boulevard bridge. At the
Tamarack State Beach parking lot, a four-foot berm is proposed to keep water out of the
tunnel. Additionally, a gate can be added to both ends of the tunnel for closure during
maintenance or flooding.
To provide complete ADA access from the eastern side of Carlsbad Boulevard to Tamarack State
Beach on the west, an ADA ramp connecting the eastern sidewalk of Carlsbad Boulevard to the
North Shore Agua Hedionda Lagoon Trail would be provided. On the western side of the
crossing under Carlsbad Boulevard, an ADA-compliant concrete walkway would connect to the
existing parking lot at Tamarack State Beach. The parking lot would be reconfigured to provide
a four-foot wide ADA path of travel along the western edge of the existing parking lot. The
parking lot would be restriped to accommodate the proposed ADA path of travel, while
maintaining the existing number of parking stalls and minimum parking lot drive aisle widths.
Conceptual design plans and photo simulations of the preferred alternative are displayed in
Figures 5 through 6A of the study and provided as a separate attachment. Staff recommends
issuing a request for proposals to pursue the environmental review, agency permitting,
engineering and construction documentation phases of the cut-and-cover tunnel alternative.
Review by state agencies and city commissions
Staff has met with, and electronically communicated with, the local staffs of the California
Coastal Commission and the California Department of Parks and Recreation, or State Parks,
regarding these feasibility studies on multiple occasions since the projects' inception. On Nov.
8, 2019, staff received a detailed set of comments on the draft studies from the California
Coastal Commission's local staff. On Jan. 20, 2020, staff and the city's consultant responded to
all of the comments received from the California Coastal Commission's local staff (Exhibit 3).
Staff also forwarded those responses to comments to the State Parks local staff.
On Feb. 6, 2020, staff met with State Parks local staff regarding these studies. Staff responded
to several questions posed by State Parks local staff, primarily with respect to specific technical
items that would be addressed through subsequent phases of the projects. The California
July 21, 2020 Item #7 Page 6 of 157
Coastal Commission would have appeal authority on the city's issuance of a coastal
development permit for the ADA Beach Access Project and would have primary authority on
the issuance of a coastal development permit for the Trail Connectivity to Tamarack State
Beach Project. State Parks would have permitting authority on both projects, relative to
property ownership rights.
Staff presented a report on these project feasibility studies to the Traffic and Mobility
Commission on Feb. 3, 2020. The commission voted unanimously to support staff's
recommendation for the City Council to approve the studies. Staff presented informational
reports on these project feasibility studies to the Beach Preservation Commission on Feb. 4,
2020 and to the Parks & Recreation Commission on Feb. 24, 2020. All three commissions
expressed general support of the projects' intentions and concepts. Individual members of each
commission also provided the following comments, as summarized by staff:
Traffic and Mobility Commission
• Recommended a barrier along the edges of the access ramps for added protection of users
• Expressed concerns regarding the temporary traffic impacts during construction of a tunnel
• Questioned the need of trail connection to Tamarack State Beach based on user volume
Beach Preservation Commission
• Reinforced the need to position the ADA-access ramps to accommodate sea level rise
• Recommended installing deterrents to skateboarders on ADA-access ramps and guard rails
Parks & Recreation Commission
• Considered installation of additional disabled parking stalls at the Ocean Street parking lot
• Questioned the use of city funding versus the use of state or grant funding for construction
• Recommended transitions from the ADA-access ramps onto hardened mats over the sand
Fiscal Analysis
The feasibility studies developed a planning-level opinion of the probable construction costs for
the ADA-access ramps and the trail connectivity to Tamarack State Beach.
The estimated cost of the ADA Beach Access project, including design, state environmental
clearance and construction, was approximately $2,800,000 for each ramp. A detailed
breakdown of the costs can be found in Appendix F of the Carlsbad ADA Beach Access
Feasibility Study. The total available funding for this project is reflected in the table below.
ADA BEACH ACCESS PROJECT - CIP PROJECT NO. 6065
Current appropriation $375,000
Current Expenditures/encumbrances $103,110
TOTAL AVAILABLE FUNDING $271,890
The estimated cost of the Trail Connectivity to Tamarack State Beach Project, including design,
state environmental clearance and construction, was approximately $3,000,000. A detailed
July 21, 2020 Item #7 Page 7 of 157
breakdown of the costs can be found in Appendix B of the Trail Connectivity to Tamarack State
Beach Feasibility Study. The total available funding for this project is reflected in the table
below.
NO. 4063 TRAIL CONNECTIVITY TO TAMARACK STATE BEACH — CIP PROJECT
Current appropriation $3,276,000
Current expenditures/encumbrances $152,160
TOTAL AVAILABLE FUNDING $3,123,840
Proposition H
In 1982, the citizens of Carlsbad adopted Proposition H, codified at Carlsbad Municipal Code
Chapter 1.24, which states,
The city shall make no real property acquisition and/or no improvement to real property
the cost of which exceeds one million dollars in city funds, unless the proposed
acquisition and/or improvement project and the cost in city funds is first placed upon
the ballot and approved by a majority of the voters voting thereon at an election. A
project may not be separated into parts or phases so as to avoid the effects of this
chapter.
Proposition H allows the City Council to adopt reasonable guidelines to implement the chapter
following notice and a public hearing, which occurred on April 5, 1983 and July 19, 2005.
Guideline 6 states, in relevant part, that an "Improvement to Real Property" does "not include
replacement, repair, maintenance, routine refurbishment or upgrades of existing facilities as
they are considered to be routine ongoing capital expenditures necessary to carry out the
normal and routine business of the city." Guideline 6 also allows the City Council to make
findings on a case-by-case basis regarding whether an exception applies to a particular project.
Guideline 5 requires any legal challenge to the determinations of the City Council made in
regard to the application of the ordinance or the guidelines, or a decision to undertake a
particular project be brought within 30 days.
Then in 2001, the citizens of Carlsbad adopted Proposition C which approved spending city
funds, including General Fund money, in an amount exceeding $ 1 million to construct certain
capital facilities, including trails linkages.
The proposed resolution includes findings for City Council to make regarding the application of
Propositions H and C and the implementing guidelines, in order to utilize the 30-day limitations
period provided by Guideline 5. The proposed findings are that the ADA Beach Access Project
(CIP Project No. 6065) and the Trail Connectivity to Tamarack State Beach Project (CIP Project
No. 4063) are in compliance with Proposition H because Proposition C specifically allows for the
expenditure of General Fund monies in excess of $1 million for trail linkages such as these.
Alternatively, the projects may be considered routine ongoing capital upgrades of existing
facilities, which are exempt from Proposition H voter approval requirements.
July 21, 2020 Item #7 Page 8 of 157
Next Steps
Staff will prepare a request for proposals for a firm to address the environmental review,
agency permitting, engineering and construction documentation phases of the projects.
Environmental Evaluation (CEQA)
In keeping with California Environmental Quality Act Guidelines Section 15262, feasibility
studies for possible future actions which the city has not approved, adopted or funded are
exempt from environmental review provided that environmental factors are considered. Both
recommended feasibility studies include a brief analysis of environmental constraints. Selecting
project alternatives for which to pursue the environmental review, agency permitting,
engineering and construction documentation does not commit the city to any definite course of
action and does not foreclose the potential for alternatives or mitigation measures.
Public Notification
Public notice of this item was posted in accordance with the Ralph M. Brown Act and it was
available for public viewing and review at least 72 hours prior to scheduled meeting date.
Exhibits
1. City Council resolution
2. City Council staff report and resolution of July 24, 2018
3. Jan. 20, 2020 responses to comments received from local California Coastal Commission staff
July 21, 2020 Item #7 Page 9 of 157
EXHIBIT 1
RESOLUTION NO.
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF CARLSBAD,
CALIFORNIA, ACCEPTING THE AMERICANS WITH DISABILITIES ACT
BEACH ACCESS FEASIBILITY STUDY AND THE TRAIL CONNECTIVITY TO
TAMARACK STATE BEACH FEASIBILITY STUDY, INCLUDING THE
CORRESPONDING CONCEPT PLANS, AND DIRECTING STAFF TO PREPARE
A REQUEST FOR PROPOSALS TO PURSUE THE ENVIRONMENTAL
REVIEW, AGENCY PERMITTING, ENGINEERING AND CONSTRUCTION
DOCUMENTATION PHASES OF THE PROJECTS.
WHEREAS, on July 24, 2018, the City Council adopted a resolution authorizing the execution of
a Professional Services Agreement with Chen Ryan for the preparation of feasibility studies for the
Americans with Disabilities Act (ADA) Beach Access Project, Capital Improvement Program (CIP) Project
No. 6065, and the Trail Connectivity to Tamarack State Beach Project, CIP Project No. 4063; and
WHEREAS, the development of both the ADA Beach Access Feasibility Study and the Trail
Connectivity to Tamarack State Beach Feasibility Study involved a public outreach process to help
inform the final recommendations; and
WHEREAS, the combined team of Public Works Branch staff, Parks & Recreation Department
staff, and the integrated transportation and land use planning consultant's staff conducted community
and stakeholder outreach to help identify the level of support for these projects; and
WHEREAS, these events included a stakeholder group meeting held on Thursday, Nov. 15, 2018
and a follow-up stakeholder group meeting on Wednesday, Aug. 28, 2019, and on-site "pop-up" events
Friday, Nov. 16, 2018 and Saturday, Nov. 17, 2018, to gather further community input; and
WHEREAS, throughout the public outreach process, participants expressed that Carlsbad Village
is great for wheelchair users due to the generally flat topography; and
WHEREAS, the overwhelming consensus of participants was that the preferred location for ADA
access to the beach would be near Pine Avenue, due to its proximity to Carlsbad Village; and
July 21, 2020 Item #7 Page 10 of 157
WHEREAS, an ADA access at Tamarack Avenue was identified as an additional location - due to
the high levels of pedestrian activity and available amenities at Tamarack State Beach; and
WHEREAS, the ADA Beach Access Feasibility Study evaluated five alternatives using criteria
established by the project team; and
WHEREAS, the project team goals were to develop up to two preferred alternatives for ADA
access to the beach; and
WHEREAS, the two preferred alternatives selected for this purpose are located north of Pine
Avenue and at the Tamarack Avenue restroom; and
WHEREAS, the two preferred alternatives would provide ADA accessible connections to the
lower sea wall, which is designated as a city trail; and
WHEREAS, staff recommends pursuing the environmental review, agency permitting,
engineering and construction documentation phases on both preferred alternatives, to provide ADA
access at each end of the lower sea wall; and
WHEREAS, the Trail Connectivity to Tamarack State Beach Feasibility Study evaluated the
feasibility of constructing a tunnel or undercrossing to connect the North Shore Agua Hedionda Lagoon
Trail to Tamarack State Beach; and
WHEREAS, the study evaluated five alternatives to determine the engineering feasibility, which
took into consideration factors such as terrain, sea level rise and constructability; and
WHEREAS, the cut-and-cover tunnel was found to be the most feasible option to connect the
North Shore Agua Hedionda Lagoon Trail to Tamarack State Beach; and
WHEREAS, staff recommends pursuing the environmental review, agency permitting,
engineering and construction documentation phases for the cut-and-cover tunnel alternative; and
July 21, 2020 Item #7 Page 11 of 157
WHEREAS, staff has met with, and electronically communicated with, the California Coastal
Commission (CCC) local staff and the California Department of Parks and Recreation (State Parks) local
staff regarding these feasibility studies on multiple occasions since the projects' inception; and
WHEREAS, the CCC would have appeal authority on the city's issuance of a Coastal Development
Permit for the ADA Beach Access Project and would have primary authority on the issuance of a coastal
development permit for the Trail Connectivity to Tamarack State Beach Project; and
WHEREAS, State Parks would have permitting authority on both projects, relative to property
ownership rights; and
WHEREAS, the estimated cost of the ADA Beach Access Project was —$2,800,000 per ramp; and
WHEREAS, the estimated cost of the Trail Connectivity Project was —$3,000,000; and
WHEREAS, Proposition H, codified in Carlsbad Municipal Code Chapter 1.24, states in relevant
part that "the city shall make no real property acquisition and/or no improvement to real property the
cost of which exceeds one million dollars in city funds, unless the proposed acquisition and/or
improvement project and the cost in city funds is first placed upon the ballot and approved by a
majority of the voters voting thereon at an election;" and
WHEREAS, the Guidelines implementing Proposition H, adopted pursuant to the Carlsbad
Municipal Code Section 1.24.050, states that the term "Improvement to Real Property' shall not
include replacement, repair, maintenance, routine refurbishment or upgrades of existing facilities as
they are considered to be routine ongoing capital expenditures necessary to carry out the normal and
routine business of the city. The City Council may make findings on a case-by-case basis on whether
the above exceptions are applicable to a proposed project" and
July 21, 2020 Item #7 Page 12 of 157
WHEREAS, the ADA Beach Access and Trail Connectivity to Tamarack State Beach projects are
not "Improvements to Real Property" as defined by the guidelines implementing Proposition H because
the proposed projects are upgrades of existing facilities necessary to provide ADA access to beaches
and trails in the City of Carlsbad; and
WHEREAS, Proposition C, approved by a majority of voters in the City of Carlsbad in 2001,
authorized "spending city funds from various sources including the General Fund in an amount over $1
million to construct capital facilities including ... trail linkages and open space..."; and
WHEREAS, the ADA Beach Access and Trail Connectivity to Tamarack State Beach projects are
both trail linkages; and
WHEREAS, staff is recommending City Council accept these two feasibility studies, including the
corresponding concept plans, and direct staff to proceed with the issuance of a request for proposals
for the environmental review, agency permitting, engineering and construction documentation phases
of the ADA Beach Access and Trail Connectivity to Tamarack State Beach projects; and
WHEREAS, the City Planner has determined that City Council's acceptance of the feasibility
studies is categorically exempt per the California Environmental Quality Act (CEQA) pursuant to CEQA
Guidelines section 15262 and will not have a significant effect on the environment because it is the
acceptance of a consultant's feasibility study for possible future actions which the city has not
approved, adopted or funded; and
WHEREAS, selecting project alternatives for which to pursue the environmental review, agency
permitting, engineering and construction documentation does not commit the city to any definite
course of action and does not foreclose the potential alternatives or mitigation measures.
July 21, 2020 Item #7 Page 13 of 157
NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Carlsbad, California, as
follows:
1. That the above recitations are true and correct.
2. That the Americans With Disabilities Act Feasibility Study and the Trail Connectivity to
Tamarack State Beach Feasibility Study (Attachment A and Attachment B, respectively),
including corresponding concept plans (Attachment C), are accepted.
3. That the City Council selects Preferred Alternatives 1 and 4 as the preferred project
alternative for the ADA Beach Access Project.
4. That the City Council selects Preferred Alternative 5 as the preferred project alternative
for the Trail Connectivity to Tamarack State Beach Project.
5. That staff is directed to prepare a request for proposals to pursue the environmental
review, agency permitting, engineering and construction documentation phases of the
ADA Beach Access and Trail Connectivity to Tamarack State Beach projects.
6. That funding the proposed ADA Beach Access project, CIP Project No. 6065, and Trail
Connectivity to Tamarack State Beach Project, CIP Project No. 4063, using General Fund
money would comply with Proposition H because Proposition C authorized expenditures
of city funds over $1 million for trail linkages, and the proposed projects would not be
an Improvement to Real Property, as defined by the guidelines implementing
Proposition H.
7. That the City Planner has considered the environmental factors and determined that
this action is categorically exempt from CEQA pursuant to CEQA Guidelines section
15262 and that an exception to the exemption does not apply. Selecting project
alternatives for which to pursue the environmental review, agency permitting,
engineering and construction documentation does not commit the city to any definite
course of action and does not foreclose the potential for alternatives or mitigation
measures.
July 21, 2020 Item #7 Page 14 of 157
PASSED, APPROVED AND ADOPTED at a Regular Meeting of the City Council of the City of
Carlsbad on the day of , 2020, by the following vote, to wit:
AYES:
NAYS:
ABSENT:
MATT HALL, Mayor
BARBARA ENGLESON, City Clerk
(SEAL)
July 21, 2020 Item #7 Page 15 of 157
Attachment A
ADA Beach Access Feasibility Study
Final Report
Prepared for:
(City of
Carlsbad
Transportation Planning & Mobility
Public Works Department
City of Carlsbad
1635 Faraday Avenue
Carlsbad, CA 92008-7314
Prepared by:
CHEN *RYAN
3900 5th Avenue, Suite 310
San Diego, CA 92103
January 2020
July 21, 2020 Item #7 Page 16 of 157
Table of Contents
1.0 Introduction 2
1,1 Overview 2
1.2 Project Identification and Goals 2
1.3 Project Study Area 2
2.0 Existing Conditions 4
3.0 Feasibility Study Approach 4
3.1 Existing Access Utilization 4
3.2 Community Input 5
3.3 Vegetation Constraints Analysis 6
3,4 Engineering Evaluation 9
35 Development and Evaluation of Ramp Alternatives 10
3.6 Evaluation criteria to select preferred ramp 10
4.0 Feasibility Study Results 11
4.1 Preferred Alternatives 11
4.2 Conceptual Design 12
4.3 Opinion of Probable Construction Costs 19
4.4 CEQA Clearance 19
Appendices
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Pedestrian Acitivity Analysis
Vegetation Constraints Memorandum
Existing Conditions Slope Analysis
Pine Avenue and Tamarack Avenue Ramp Options
Pine Avenue and Tamarack Avenue Ramps
OPCC and Structures Estimate
Environmental Constraints Table
List of Figures
Figure 1 Project Study Area 3
Figure 2 Habitat Value Assessment 8
Figure 3 Pine Avenue Beach Access 13
Figure 4 Pine Avenue Ramp 14
Figure 5 Tamarak Avenue Beach Access 15
Figure 6 Tamarak Avenue Restroom Ramp 16
Figure 7 Design Character 17
Figure 8 Plant Materials 18
List of Tables
Table 3.1 24-Hr Pedestrian Activity —Saturday, August 11, 2018 5
Table 4.1 The Criteria for Evaluating Alternatives With Associated Weighting 11
July 21, 2020 Item 4*7 Page 17 of 157
1.0 Introduction
1.1 Overview
The City of Carlsbad Public Works — Transportation Department commissioned a feasibility study to
evaluate alternatives to provide access to Carlsbad State Beach (beach) that are compliant with the
Americans with Disabilities Act (ADA) requirements.
Purpose
The purpose of the project is to provide access for all pedestrians, regardless of ability, to one of the
area's premiere beaches. The importance of this project cannot be understated since it will allow the
community to enjoy a beautiful natural-resource that is unique to the region. The proposed project
promotes the spirit and vision of both the California Coastal Act and the Americans with Disabilities
Act.
1.2 Project Identification and Goals
ADA Beach Access Study, CIP No. 60651
The project's main objective is to evaluate the feasibility of constructing one or more ADA access
ramps to provide a connection from Carlsbad Boulevard to the beach. A number of alternatives were
considered and evaluated using criteria established by the project team. The project goal was to
develop up to two preferred alternatives for this connection between Carlsbad Boulevard and the
beach.
1.3 Project Study Area
The ADA Beach Access Study project area is along Carlsbad Boulevard and the beach from to the
parking lot just north of Pine Avenue to the Cold-Water Inlet Bridge (bridge), just south of Tamarack
Avenue.
Figure 1 displays the project's study area.
July 21, 2020 Item #7 Page 18 of 157
UNIMPROVED
ACCESS VIA SLOPE
EX. RAMP
@ PINE AVE
STAIRWAY —
@ SYCAMORE AVE
Rao,
,3141,14'
6,
STAIRWAY
@ MAPLE AVE
- AC WALK
RAMP ' ADJACENT TO Pi . it
@ RESTROOM '- STAIRWAY PARKING LOT
- BUILDING ', @ TAMARACK AVE ACCESS WAY ,
• s. 4
`s.
4* • ", t
, STAIRWAY
@ CHERRY AVE STAIRWAY
@ HEMLOCK AVE OZOZ "CZ Ainf Figure 1— Project Study Area
.7 co
3 LST 40 61 aed
2.0 Existing Conditions
Carlsbad State Beach, also known as Tamarack State Beach, stretches from the warm water jetties, just
south of Tamarack Avenue, to Frazee Beach, near Carlsbad Village Drive.
Carlsbad Boulevard runs along the bluffs above the beach along this stretch of coastline. At the north
end of the project (near Pine Avenue), the roadway is approximately 30 feet above the beach; at the
south end (bridge), the roadway is about 12 feet above the parking lot. Along these 4,200 lineal feet,
pedestrian access is provided via six stairways and two ramps. Vehicular access is provided as an
extension of Tamarack Avenue to Tamarack State Beach. The slopes of the two ramps at Pine Avenue
and Tamarack Avenue exceed the allowable slopes defmed by ADA at 15.6% and 9.9%, respectively
and with no landings.
The Carlsbad Seawall, a paved walking path along the coast, extends from Pine Avenue to Tamarack
Avenue. The lower seawall runs along the bottom of the bluffs at the back beach and provides shoreline
protection for the walking path and the bluffs. Stairs are provided to connect to lower seawall to the
beach. The upper seawall includes a paved walking trail along the west side of Carlsbad Boulevard.
The section of the coastline is highly utilized by people walking, jogging, and cycling.
3.0 Feasibility Study Approach
This chapter describes the various studies performed as part of the selection process for the location of
the proposed ramps.
3.1 Existing Access Utilization
In order to determine utilization at the existing points of access to the beach, pedestrian counts were
conducted at eight (8) locations (see below) along Carlsbad Boulevard on an average Saturday
(Saturday, August 11,2018).
1. Pine Avenue Beach Access Ramp;
2. Sycamore Avenue Stairway;
3. Maple Avenue Stairway;
4. Cherry Avenue Stairway;
5. Hemlock Avenue Stairway;
6. Tamarack Avenue Stairway;
7. Tamarack Beach Parking Lot Access Road Walkway; and
8. Cold-Water Inlet Stairway.
July 21, 2020 Item #7 Page 20 of 157
Table 3.1 displays the pedestrian counts collected Saturday, August 11, 2018.
TABLE 3.1 — 24-HR PEDESTRIAN ACTIVITY — SATURDAY AUGUST 11 2018
Location
1 — Pine Avenue Beach
Access Ramp
Total
Pedestrian
Counts
5,720
Peak Hour
7:00 PM
Peak Hour
Volume
536
2— Sycamore Avenue
Stairway 1,599 2:00 PM 191
3 — Maple Avenue
Stairway 1,249 1:00 PM 126
4 — Cherry Avenue
Stairway 2,042 7:00 PM 206
5 — Hemlock Avenue
Stairway 1,686 4:00 PM 173
6— Tamarack Avenue
Stairway 3,477 7:00 PM 316
7 — Tamarack Beach
Parking Lot Access
Road Walkway
1,758* 7:00 PM 215*
8— Cold-Water Inlet
Stairway 1,007 9:00 AM 120
Source: Chen Ryan Associates, June 2019.
Notes:
*Pedestrian volumes obtained using ratios developed based on counts from Friday,
August 10th.
As shown in Table 3.1, the Pine Avenue Beach Access Ramp was identified as the location with the
highest pedestrian activity with 5,720 pedestrians on an average summer Saturday. It should also be
noted that the combined number of pedestrians at the two available access points at Tamarack Avenue
was 5,235. The Cold-Water Inlet Stairway was identified as the location with the lowest pedestrian
activity with 1,007 pedestrians on an average summer Saturday. See Appendix A for pedestrian count
worksheets.
3.2 Community Input
The project team conducted community and stakeholder outreach initiatives to identify the level of
support and obtain community input for the ADA Beach Access Feasibility Study. These efforts
included:
• Stakeholder Meeting (November 15, 2018);
• On-site "pop-up" events (November 16 and 17, 2018).
The people who were invited to the Stakeholder Meeting were residents that had previously expressed
a desire for better access to Carlsbad State Beach. Many of these stakeholders are wheelchair users
and lived in the Carlsbad Village. They expressed that the village is a great for them due to the
generally flat topography. The overwhelming consensus from this group was that their most ideal
location for ADA access would be near Pine Avenue. Tamarack Avenue was identified as a potential
July 21, 2020 Item #7 Page 21 of 157
location if more than one ramp could be built. The reason for this overwhelming consensus is due to
the close proximity to Carlsbad Village of a Pine Avenue ADA Ramp compared to other locations
further to the south.
The two "pop-up" events were held
on-site. One was held on a Friday
afternoon near Pine Avenue and the
second was held on a Saturday
morning near Tamarack Avenue.
There was board support from the
community for the project at these
two events.
"Pop-up" event held near Pine Avenue on November 16, 2018
3.3 Vegetation Constraints Analysis
To aid in siting considerations that may minimize impacts to native habitats, the project team conducted
a qualitative assessment of bluff habitats supporting native plants along the coastal bluffs in the project
vicinity.
This assessment included a field inspection of the site to determine species composition and relative
cover values for native plants, non-native plants, and unvegetated areas. Bluff habitats were divided
into areas (polygons) of similar cover proportions and depicted on a map.
Common native species observed in the study area included coast prickly pear (Opuntia littoralis),
California fuchsia (Epilobium canum), seacliff buckwheat (Eriogonum parvifolium), California
boxthorn (Lycium californicum), coastal goldenbush (Isocoma menziesii), coast cholla
(Cylindropuntia prolifera), and California encelia (Encelia californica). Common non-native species
observed included, ngaio (Myoporum laetum), sea lavender (Limonium perezii), and natal plum
(Carissa macrocarpa).
On the basis of the relative cover values, each of the 12 mapped polygons were then ranked from
highest potential impact to native plant resources (Rank of 1) to lowest potential impact to native plant
resources (Rank of 12) on the basis of the assigned cover value using the following assumptions:
> Higher relative cover value of native plant implies higher potential impacts
> Higher relative cover value of non-native plants implies lower potential impacts
> Higher relative cover value of unvegetated implies lower potential impacts
See Appendix B for the Vegetation Constraints Memorandum.
July 21, 2020 Item #7 Page 22 of 157
The vegetation assessment provides a ranking for potential habitat impacts associated with construction
of ADA access along Carlsbad Boulevard. Figure 2 displays polygons and their respective ranking
with the highest rankings reflect the lowest degree of impact to native and/or dense vegetation along
the bluffs, while those with lower rankings represent those areas that should be avoided if feasible. For
example, Polygon "I" had the lowest ranking and would result in the highest amount of impacts to
native and/or dense vegetation, therefore this area was to be avoided. Polygon H has the highest ranking
of 12 and would result in the least amount of impacts. Impacts to this resource represent one
consideration among many, and helped inform siting efforts for the preferred alternatives.
July 21, 2020 Item #7 Page 23 of 157
60 40
5 80 RI
0 85 G'
5 80 F
5 75 A
15 60 K
10 55 D
0 25 L
10 30 C
0 20 E
15 5
5 15
0
15
15
15
20
25
35
75
60
80
80
80
Figure 2 — Habitat Value Assessment
G 2SC 0 250
Feet ADA ACCESSIBILITY
HABITAT VALUE ASSESSMENT Scaie:1:3,000 I in - 250 fe-?-1
July 21, 2020 Item #7 Page 24 of 157
3.4 Engineering Evaluation
A number of steps were taken to evaluate the engineering feasibility of ADA access ramp(s) from
Carlsbad Boulevard to the beach. Two key factors that were considered throughout this evaluation
were landform alteration and shoreline protection. This is due to the project team's understanding of
the California Coastal Commission's (CCC) desire to minimize landform alteration and installation of
new shoreline protection along the coastline.
A review of existing conditions was completed, including an evaluation of how long ADA compliant
ramps would need to be at various locations within the study area. Existing utilities were also identified
within the project area. These included the storm drain outfall at Pine Avenue and above ground
irrigation within along the bluffs.
In order to determine if the ramps could be constructed at grade while minimizing landform alteration,
a slope analysis was completed along the bluffs within the study area.
See Appendix C for slope analysis exhibits.
Land Form Alteration
Land form alteration is identified in the California Coastal Act as a significant environmental concern
for the following reasons:
• Land form alteration often leads to loss of habitat, erosion, runoff and water quality
degradation.
• Once land form alteration has occurred, it is difficult, if not impossible for an engineered area
to replicate all the functions of an unaltered area.
• Land form alteration in steep slope areas can have far more impact than in low relief areas.
• Development in steep areas often proposes vast amounts of land form alteration to make the
area safe and buildable.
Slope Analysis Results
The slope analysis showed slopes of stepper than 2:1 within the bluffs throughout the study area. These
steep slopes led the project team to determine that an elevated ramp system with pile supports would
be seen as more favorable compared to an at-grade ramp by both the CCC and CA State Parks.
Geotechnical
Based on preliminary review of existing conditions and the Geotechnical Investigation Report for the
Tamarack Coastal Improvements Project prepared by AECOM on March 2018, since the proposed pile
supports are entirely in the bluffs, putting it in formational soil (Terrace Deposits), liquefaction would not
be an issue.
July 21, 2020 Item #7 Page 25 of 157
3.5 Development and Evaluation of Ramp Alternatives
Based on the existing access utilization, community input, the vegetation constraints analysis, and the
engineering evaluation, all described above, five (5) different alternative ramp locations were identified
for further evaluation:
• North of Pine Avenue
• Pine Avenue
• Cherry Street
• Tamarack Avenue Restroom
• South of Tamarack Avenue Access Road
3.6 Evaluation criteria to select preferred ramp
The project team identified fourteen (14) potential criterion for evaluation of the five alternatives.
These included the following:
1. Usage / Demand
2. Safety and Convenience
3. Construction Feasibility / Complexity
4. California Coastal Commission Acceptance
5. Aesthetics
6. Public Input
7. State Parks Concurrence
8. Sea Level Rise / Storm Damage Vulnerability
9. Biological Resources
10. Geotechnical / Geology
11. Transportation / Traffic
12. Noise
13. Greenhouse Gas Emissions
14. Air Quality
The project team participated in an online survey to rank the fourteen (14) potential criterion based on
each team member's opinion of what should be considered as most important. These ranking led to
the elimination of the four (4) lowest scoring criterion, leaving the team with ten (10) criterion for
ranking the alternative ramp locations. Further, the project team utilized the ranking from the survey
to assign weights to each of the scoring criterion with the highest being worth a maximum of 13 points
and the lowest being worth a maximum of 6 points out of 100. Table 4.1 depicts the final criteria and
associated weight given to each criterion. It should be noted each of the five (5) ramp alternative
locations would have received very similar scores for each of the four criterion that were eliminated
(Transportation/Traffic, Noise, Greenhouse Gas Emissions, and Air Quality).
July 21, 2020 Item #7 Page 26 of 157
TABLE 4.1 displays the criteria for evaluating alternatives with associated weighting
#
1
Criteria Weight
usage/Demand 1.3
Weighted
Max
13
2 Safety/Convenience 1.3 13
3 Construction 1.1 Feasibility/Complexity 11
4 CCC Acceptance 1.1 11
5 Aesthetics 1.1 11
6 Public Input 1.0 10
7 State Parks Concurrence 1.0 10
8 Vulnerability 0.8 8
9 Biological Resources 0.7 Impact 7
10 Geotech / Geology 0.6 6
Total 10.0 100
Source: Chen Ryan Associates, June 2019.
4.0 Feasibility Study Results
4.1 Preferred Alternatives
The project team utilized the criteria for evaluating alternative locations to score each of the five (5)
alternative locations compared to one another.
Summary of the evaluation for each alternative:
• North of Pine Avenue— preferred alternative #1. The alternative location scored high across
the board with high scores for usage/demand, construction feasibility/complexity, CCC
acceptance, public input, State Parks concurrence, and biological resources impact. The only
real mark against this alternative is vulnerability. This is because the end of the ramp is at
grade and not protected by shoreline protection. However, some of the existing rip-rap could
be moved around to enhance this deficiency.
• Pine Avenue — This alternative scored lower than North of Pine due to the complexity of
constructing the ramp in the narrow area between the existing restroom and the upper sea wall
walkway. If would also result in greater impacts to biological resources and require some
landform alteration at the end of the ramp.
• Cherry Street - lowest score. This alternative scored poorly on usage/demand,
safety/convenience, and public input.
• Tamarack Avenue Restroom — preferred alternative #2. This alternative location scored
second highest overall.
July 21, 2020 Item #7 Page 27 of 157
• South of Tamarack Avenue Access Road — This alternative scored lower than the Tamarack
Avenue Restroom due to vulnerability (it does not land behind the lower seawall) and
safety/convenience (it requires crossing vehicle drive aisle to access the beach and does not
allow for ADA access to the existing restroom).
4.2 Conceptual Design
Schmidt Design Group developed a number of rough sketches for the two preferred alternatives (see
Appendix D). These were refined utilizing input from the project team and city staff (see Appendix
E). Some of the key decisions that were made during this process included the following:
• North of Pine Avenue Ramp —
o Land the ramp near the existing rip-rap adjacent to the existing restroom. This
approach mitigates the vulnerability to raising sea levels and provides access to the
ADA compliant restroom. Landing on the sand as shown on some of the initial
sketches was not seen as ideal.
o Do not include stairs. The project team decided that inclusion of stairs that provide
access to a different potion of the beach does not meet the reasonable accommodation
requirements of ADA.
o Ramp to be 8' wide.
o Maintain existing informal railroad tie access trails at the parking lot.
• Tamarack Avenue Restroom Ramp —
o Minimize ramp length within the bluffs. This approach lessens impact to biological
resources.
o Revise existing ramp to existing restroom to be ADA compliant. This allows for ADA
access to the existing restrooms and also allows a large portion of the ramp system to
be built at-grade (much lower cost) on previously disturbed land.
• Ramp to be 8' wide.
Figures 4-7 display the North of Pine Avenue Ramp and Tamarack Avenue Restroom Ramp final
concepts and photo simulations.
Figures 8 and 9 display the conceptual design character and plant materials for the projects.
July 21, 2020 Item #7 Page 28 of 157
ozoz 1 z AI n r KEY
o PROPOSED BA" RAM P WITH
HANDRAILING
Figure 3— North of Pine Avenue Ramp
CAnt
POPOsEt ACC A I•Af LS110 6Z 022d fi 2% MAX. LANDINGS; TYPICAL
o PROPOSED PLANTING AREA, TYPICAL
o START OF ELEVATED ACCESSIBLE PATH ON
STRUCTURAL COLUMNS
o END OF ELEVATED ACCESSIBLE PATH
ON STRUCTURAL COLUMNS. PATH
CONTINUES AT GRADE TO THE SOUTH
o EXISTING ADA ACCESSIBLE PARKING
e• EXISTING BLUFF & TRAILS TO REMAIN;
REPAIR AS NEEDED
O EXISTING STORM DRAIN
ei PROPOSED LOCATION FOR RELOCATED
SHOWER
C EXISTING SIDEWALK
• EXISTING RIP RAP
• EXISTING RESTROOM
• EXISTING SHOWER TO BE RELOCATED
OZOZ `TZ Alni Figure 4- North of Pine Avenue Ramp - Photosimulation LST 40 OE @Oed
1111111.1.11M
EXISTING CONOMONS • ozoz 'iz Ainf Figure 5 — Tamarack Avenue Restroom Ramp
CARLSBAD BLVD. KEY
0 PROPOSED 8'-0"WIDE CONCRETE RAMP
WITH HANDRAILING
EXISTING TURF TO REMAIN
O PROPOSED 8 ELEVATED WOOD RAMP ON
STRUCTURAL COLUMNS
O PROPOSED STAIRCASE
o PROPOSED PLANTING AREA; TYPICAL
01 PROPOSED RETAINING WALL
O PROPOSED ACCESSIBLE PATH TO PARKING
LOT
PROPOSID ACCESS RAMP TAMARACK STATE BEACH
O EXISTING SEAWALL
EXISTING VI EXISTING RETAINING WALL
PARKING LOT
' 0 EXISTING PLANTING AREA
119 EXISTING GUARDRAILING
O RELOCATE EXISTING PICNIC TABLE
e RELOCATE EXISTING TRASH RECEPTACLES
O EXISTING PICNICTABLE
el EXISTING SHOWERS AND PLAZA
0 EXISTING FENCE
0 EXISTING PAVING
O EXISTING LIFEGUARD TOWER
O EXISTING AC SIDEWALK LST jo TE aed
OZ0z `-rz Ainf ro 3 4:t LSI JO ZE aed Figure 6 — Tamarack Avenue Restroom Ramp — Photosimulation
PROPOSED RETAINING WALL TEXTURE 1110SWAIIA2111••161 111111.. AMIN&
Figure 7 — Conceptual Design Character
PROPOSED HANDRAIL CHARACTER
MB' I I It OZOZ'T Aini PROPOSED ELEVATED CONCRETE PLANK SURFACE WITH GUARDRA LING CHARACTER LSI JD EE @2ed ELEMTIQU
PROPOSED STAIR RAILING PROPOSED STAIR RAILING PROPOSED LIGHTING INTEGRATED
WITH HANDRAIL
LST JOVE aed MANZANITA
Arctostaphylloc x 'Howard McMinn"
DWARF COYOTE BUSH
Baccharic p 'Neon Point'
WILD LILAC
Ceanothus maritinius
SEA DAHLIA
Coreopsic rnardirna
COASTAL AGAVE
Aaave shawii
CHALK LIVEFOREVER
Dodleya polverolenta
SEASIDE DAIS'Y
Engeron g. 'Wayne Roden&
SANTA CRUZ ISLAND BUCKWHEAT
Ertogonum arboreccen:
RED BUCKWHEAT
Enogonutin panda rubeccenc
BEACH 'STRAWBERRY
Fragaria chtloensis
COASTAL ENCELIA
Encella cabfornica
COASTAL GUM PLANT
Crinde/ia ctricta
ISLAND SNAPDRAGON
Calvecia cpec.o:a
ISLAND SHRUB MALLOW
Lavatera accurgentflora
ARTEM‘SIA CALIFORNICA
California Sagebrush
Figure 8— Proposed Plant Materials ozoz V Ainr
4.3 Opinion of Probable Construction Costs
The project team developed a planning level opinion of probable construction costs for the ramps. The
estimated cost, including design and CEQA clearance, was $2.8M for each ramp. A breakdown of
costs can be found in Appendix F.
4.4 CEQA Clearance
The project team completed an evaluation of environmental constraints to help transition into the next
phase of the project. The biggest constraint are the existing biological resources that would be
impacted by construction. However, these impacts can be mitigated. The Environmental Constraints
Analysis Table can be found in Appendix G.
July 21, 2020 Item #7 Page 35 of 157
Page 120
Appendix A
Pedestrian Activity Analysis
Carlsbad ADA Beach Access
JC+1M1 RYAN Item #7 VSLelk6M7
9/26/2018 CARLSBAD ADA BEACH AND LAGOON ACCESS FEASIBILITY PROJECT
PEDESTRIAN ACTIVITY ANALYSIS
24-Hr Pedestrian Activity - Friday, August 10, 2018
Total Pedestrian
Location Counts Peak Hour Peak Hour Volume
7 - Tamarack Blvd
Stairway 2,162 7:00 PM 203
8 - Tamarack State
Beach Access Road
Walkway
1,140 7:00 PM 138
24-Hr Pedestrian Activity - Saturday, August 11 2018
Location
Total Pedestrian
Counts Peak Hour Peak Hour Volume
1 - Pine Avenue Beach
Access Ramp 5,720 7:00 PM 536
2 - Sycamore Avenue
Stairway 1,599 2:00 PM 191
3 - Maple Avenue
Stairway 1,249 1:00 PM 126
4 - Cherry Avenue
Stairway 2,042 7:00 PM 206
5 - Hemlock Avenue
Stairway 1,686 4:00 PM 173
6 - Cold-Water Inlet
Stairway 1,007 9:00 AM 120
7 - Tamarack Blvd
Stairway 3,477 7:00 PM 316
8 - Tamarack State
Beach Access Road
Walkway
1,758* 7:00 PM 215*
*Pedestrian volumes obtained using ratios developed based on counts from Friday, August
10th
Pedestrian Activity pedestrianns in 24 HR 7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
1- Pine Avenue 2- Sycamore 3 - Maple 4 - Cherry 5- Hemlock 6- Cold-Water 7 - Tamarack 8- Tamarack
Beach Access Avenue Avenue Avenue Avenue Inlet Stairway Blvd Stairway State Beach
Ramp Stairway Stairway Stairway Stairway Access Road
Walkway
Beach Access Location
Location 1 - Pine Avenue Beach Access Ramp experienced the highest pedestrian activity with 5,720
pedestrians.
Location 6 - Cold-Water Inlet Stairway experienced the lowest pedestrian activity with 1,007 pedestrians.
July 21, 2020 Item #7 Page 37 of 157
PEDESTRIAN BEACH ACCESS STUDY
SATURDAY - AUGUST 11, 2018
CITY: CARLSBAD
PROJECT: PTD18-0810-02
LOCATION 1- Pine Avenue Beach Access Ramp
1 00:00 --> 01:00 31
2 01:00 --> 02:00 33
3 02:00 —> 03:00 0
4 03:00 —> 04:00 0
5 04:00 —> 05:00 2
6 05:00 —> 06:00 15
7 06:00 —> 07:00 75
8 07:00 —> 08:00 189
9 08:00 —> 09:00 325
10 09:00 —> 10:00 447
11 10:00 —> 11:00 361
12 11:00 —> 12:00 418
13 12:00 —> 13:00 388
14 13:00 --> 14:00 410
15 14:00 --> 15:00 371
16 15:00 --> 16:00 360
17 16:00 —> 17:00 363
18 17:00 —> 18:00 426
19 18:00 —> 19:00 436
20 19:00 —> 20:00 536
21 20:00 --> 21:00 316
22 21:00 --> 22:00 96
23 22:00 —> 23:00 69
24 23:00 —> 00:00 53
DAILY LOCATION TOTAL 5720
PACIFIC TECHNICAL DATA, LLC
July 21, 2020 Item #7 Page 38 of 157
PEDESTRIAN BEACH ACCESS STUDY
SATURDAY - AUGUST 11, 2018
CITY: CARLSBAD
PROJECT: PTD18-0810-02
LOCATION 2 - Sycamore Avenue Stairway
1 00:00 --> 01:00 8
2 01:00 --> 02:00 2
3 02:00 —> 03:00 0
4 03:00 —> 04:00 0
5 04:00 —> 05:00 4
6 05:00 —> 06:00 6
7 06:00 —> 07:00 27
8 07:00 —> 08:00 24
9 08:00 —> 09:00 71
10 09:00 —> 10:00 86
11 10:00 —> 11:00 109
12 11:00 —> 12:00 91
13 12:00 —> 13:00 115
14 13:00 --> 14:00 131
15 14:00 --> 15:00 191
16 15:00 --> 16:00 137
17 16:00 —> 17:00 122
18 17:00 —> 18:00 129
19 18:00 —> 19:00 105
20 19:00 --> 20:00 128
21 20:00 --> 21:00 64
22 21:00 --> 22:00 5
23 22:00 —> 23:00 16
24 23:00 —> 00:00 28
DAILY LOCATION TOTAL 1599
PACIFIC TECHNICAL DATA, LLC
July 21, 2020 Item #7 Page 39 of 157
PEDESTRIAN BEACH ACCESS STUDY
SATURDAY - AUGUST 11, 2018
CITY: CARLSBAD
PROJECT: PTD18-0810-02
LOCATION 3 - Maple Avenue Stairway
1 00:00 —> 01:00 7
2 01:00 —> 02:00 2
3 02:00 —> 03:00 0
4 03:00 —> 04:00 0
5 04:00 —> 05:00 4
6 05:00 —> 06:00 2
7 06:00 —> 07:00 8
8 07:00 —> 08:00 44
9 08:00 —> 09:00 55
10 09:00 —> 10:00 62
11 10:00 —> 11:00 88
12 11:00 —> 12:00 96
13 12:00 —> 13:00 74
14 13:00 —> 14:00 126
15 14:00 —> 15:00 116
16 15:00 —> 16:00 93
17 16:00 —> 17:00 107
18 17:00 —> 18:00 124
19 18:00 —> 19:00 95
20 19:00 —> 20:00 75
21 20:00 —> 21:00 54
22 21:00 —> 22:00 8
23 22:00 —> 23:00 8
24 23:00 —> 00:00 1
DAILY LOCATION TOTAL 1249
PACIFIC TECHNICAL DATA, LLC
July 21, 2020 Item #7 Page 40 of 157
PEDESTRIAN BEACH ACCESS STUDY
SATURDAY - AUGUST 11, 2018
CITY: CARLSBAD
PROJECT: PTD18-0810-02
LOCATION 4 - Cherry Avenue Stairway
1 00:00 —> 01:00 6
2 01:00 —> 02:00 4
3 02:00 —> 03:00 6
4 03:00 —> 04:00 0
5 04:00 —> 05:00 0
6 05:00 --> 06:00 4
7 06:00 --> 07:00 17
8 07:00 --> 08:00 67
9 08:00 —> 09:00 79
10 09:00 —> 10:00 95
11 10:00 —> 11:00 121
12 11:00 --> 12:00 155
13 12:00 --> 13:00 137
14 13:00 --> 14:00 158
15 14:00 —> 15:00 149
16 15:00 —> 16:00 189
17 16:00 —> 17:00 180
18 17:00 —> 18:00 154
19 18:00 --> 19:00 156
20 19:00 --> 20:00 206
21 20:00 --> 21:00 62
22 21:00 —> 22:00 27
23 22:00 --> 23:00 23
24 23:00 —> 00:00 47
DAILY LOCATION TOTAL 2042
PACIFIC TECHNICAL DATA, LLC
July 21, 2020 Item #7 Page 41 of 157
PEDESTRIAN BEACH ACCESS STUDY
SATURDAY - AUGUST 11, 2018
CITY: CARLSBAD
PROJECT: PTD18-0810-02
LOCATION 5 - Hemlock Avenue Stairway
1 00:00 --> 01:00 4
2 01:00 --> 02:00 0
3 02:00 —> 03:00 0
4 03:00 --> 04:00 2
5 04:00 --> 05:00 2
6 05:00 —> 06:00 3
7 06:00 —> 07:00 27
8 07:00 —> 08:00 68
9 08:00 --> 09:00 57
10 09:00 —> 10:00 93
11 10:00 —> 11:00 81
12 11:00 —> 12:00 121
13 12:00 —> 13:00 115
14 13:00 --> 14:00 172
15 14:00 —> 15:00 150
16 15:00 --> 16:00 134
17 16:00 —> 17:00 173
18 17:00 —> 18:00 145
19 18:00 —> 19:00 111
20 19:00 —> 20:00 124
21 20:00 --> 21:00 39
22 21:00 —> 22:00 35
23 22:00 —> 23:00 24
24 23:00 --> 00:00 6
DAILY LOCATION TOTAL
1686
PACIFIC TECHNICAL DATA, LLC
July 21, 2020 Item #7 Page 42 of 157
PEDESTRIAN BEACH ACCESS STUDY
SATURDAY - AUGUST 11, 2018
CITY: CARLSBAD
PROJECT: PTD18-0810-02
LOCATION 6 - Cold-Water Inlet Stairway
1 00:00 --> 01:00 5
2 01:00 --> 02:00 0
3 02:00 —> 03:00 0
4 03:00 —> 04:00 0
5 04:00 —> 05:00 0
6 05:00 —> 06:00 3
7 06:00 —> 07:00 34
8 07:00 —> 08:00 68
9 08:00 —> 09:00 111
10 09:00 —> 10:00 120
11 10:00 —> 11:00 101
12 11:00 —> 12:00 49
13 12:00 —> 13:00 54
14 13:00 —> 14:00 36
15 14:00 —> 15:00 48
16 15:00 ----> 16:00 41
17 16:00 —> 17:00 70
18 17:00 —> 18:00 63
19 18:00 —> 19:00 78
20 19:00 —> 20:00 69
21 20:00 —> 21:00 32
22 21:00 —> 22:00 21
23 22:00 —> 23:00 2
24 23:00 —> 00:00 2
DAILY LOCATION TOTAL 1007
PACIFIC TECHNICAL DATA, LLC
July 21, 2020 Item #7 Page 43 of 157
ADA Beach Access - Tamarack Blvd Stairway
Fri Aug 10, 2018
Full Length (12AM-12AM (+2))
All Classes (Pedestrians, Pedestrians, Bicycles, Bicycles)
All Channels
ID: 553192, Location: 33.147429, -117.345717
Provided by: City of Carlsbad (CA)
1635 Faraday Ave, Carlsbad, CA, 92008, US
Leg
Direction
North
Southbound
South
Northbound
Time T App T App lot
2018-08-10 12:00AM 0 0 0 0 0
1:00AM 0 0 0 0 0
2:00AM 0 0 0 0 0
3:00AM 0 0 0 0 0
4:00AM 0 0 0 0 0
5:00AM 1 1 2 2 3
6:00AM 17 17 8 8 25
7:00AM 31 31 35 35 66
8:00AM 29 29 32 32 61
9:00AM 51 51 37 37 88
10:00AM 81 81 45 45 126
11:00AM 76 76 86 86 162
12:00PM 100 100 88 88 188
1:00PM 86 86 105 105 191
2:00PM 74 74 86 86 160
3:00PM 69 69 109 109 178
4:00PM 83 83 109 109 192
5:00PM 70 70 97 97 167
6:00PM 70 70 87 87 157
7:00PM 79 79 124 124 203
8:00PM 45 45 88 88 133
9:00PM 25 25 19 19 44
10:00PM 9 9 1 1 10
11:00PM 3 3 5 5 8
2018-08-11 12:00AM 1 1 1 1 2
1:00AM 2 2 2 2 4
2:00AM 0 0 1 1 1
3:00AM 0 0 0 0 0
4:00AM 1 1 0 0 1
5:00AM 7 7 4 4 11
6:00AM 30 30 9 9 39
7:00AM 59 59 49 49 108
8:00AM 71 71 70 70 141
9:00AM 91 91 87 87 178
10:00AM 111 111 82 82 193
11:00AM 147 147 101 101 248
12:00PM 122 122 113 113 235
1:00PM 156 156 142 142 298
2:00PM 156 156 168 168 324
3:00PM 113 113 163 163 276
4:00PM 116 116 191 191 307
5:00PM 126 126 143 143 269
6:00PM 136 136 162 162 298
7:00PM 117 117 199 199 316
8:00PM 66 66 79 79 145
9:00PM 30 30 28 28 58
10:00PM 4 4 19 19 23
11:00PM 0 0 2 2 2
Total 2661 2661 2978 2978 5639
% Approach 100% - 100% -
% Total 47.2% 47.2% 52.8% 52.8%
Pedestrians 0 0 0
%Pedestrians 0% 0% 0% 0% 0%
ii_liu__? 1 --)n-)n Bicycles 0 0 li-c, 1+7 Dnrrn AA rvf 1 C-7 . of 15
Leg
Direction
North
Southbound
South
Northbound
Time T App T App Int
% Bic yc le s 0% 0% 0% 0% 0%
Pedestrians 2661 2661 2977 2977 5638
% Pedestrians 100% 100% 100% 100.0% 100.0%
Bicycles 0 0 1 1 1
% Bicycles - 0% 100% 0% 0.0% . T: T hru
July 21, 2020 Item #7 Page 45 of 157
2 of 15
ADA Beach Access - Tamarack State Beach Access Road Walkway
Fri Aug 10, 2018
Full Length (12AM-9:45AM (+1))
All Classes (Pedestrians, Pedestrians)
All Channels
ID: 554529, Location: 33.147551, -117.345407
Provided by: City of Carlsbad (CA)
1635 Faraday Ave, Carlsbad, CA, 92008, US
Leg
Direction
North
Southbound
South
Northbound
Time T App T App Int
2018-08-10 12:00AM 0 0 0 0 0
12:15AM 0 0 0 0 0
12:30AM 0 0 0 0 0
12:4 5AM 0 0 0 0 0
Hourly Total 0 0 0 0 0
1:0 OAM 0 0 0 0 0
1:15AM 0 0 0 0 0
1:30AM 0 0 0 0 0
1:45AM 0 0 0 0 0
Hourly Total 0 o 0 0 0
2:00AM 0 0 0 0 0
2:15AM 0 0 0 0 0
2:3 OAM 0 0 0 0 0
2:4 5AM 0 0 0 o o
Hourly Total 0 0 0 0 0
3:00AM 0 0 0 0 0
3:15AM 0 0 0 0 0
3:30AM 0 0 0 0 0
3:45AM 0 0 0 0 0
Hourly Total 0 0 0 0 0
4:00AM 0 0 0 0 0
4:15AM 0 0 0 0 0
4:3 OAM 0 0 0 0 0
4:45AM 0 0 0 0 0
Hourly Total 0 0 0 0 0
5:00AM 0 0 0 0 0
5:15AM 1 1 0 0 1
5:30AM 1 1 0 0
5 :45AM 1 1 2 2 3
Hour y Total 3 3 2 2 0
6:0 OAM 0 0 2 2 2
6:15AM 2 2 1 1 3
6:30AM 0 0 4 4 4
6:45AM 2 2 3 3 5
Hourly Total 4 4 10 10 0
7:00AM 4 4 5 5 9
7:15AM 13 13 3 3 16
7:30AM 15 15 7 7 22
7:45AM 7 7 9 9 16
Hourly Total 39 39 24 24 0
8:00AM 7 7 5 5 12
8:15AM 3 3 10 10 13
8:3 OAM 5 5 4 4 9
8:4 SAM 6 6 4 4 10
Hourly Total 21 21 23 23 0
9:00AM 11 11 7 7 18
9:15AM 11 11 5 5 16
9:3 OAM 18 18 7 7 25
9:4 5AM 13 13 5 5 18
Hourly Total 53 53 24 24 0
10:00AM 12 12 7 7 19
10:15AM 18 18 11 11 29
10:3 OAM 13 13 3 3 16
10:4 5A_M 10 10 3 3 i r --7 13
1 0 `11J Ut 1 J
Leg
Direction
North
Southbound
South
Northbound
Time T App T App Int
Hourly Total 53 53 24 24 0
11:00AM 16 16 5 5 21
11:15AM 8 8 4 4 12
11:30AM 19 19 7 7 26
11:45AM 14 14 18 18 32
Hourly Total 57 57 34 34 0
12:00PM 4 4 1 1 5
12:15PM 6 6 7 7 13
12:30PM 6 6 5 5 11
12:45PM 9 9 8 8 17
Hourly Total 25 25 21 21 0
1:00PM 3 3 4 4 7
1:15PM 10 10 9 9 19
1:30PM 15 15 5 5 20
1:45PM 0 0 4 4 4
Hourly Total 28 28 22 22 0
2:00PM 8 8 3 3 11
2:15PM 12 12 5 5 17
2:30PM 12 12 18 18 30
2:45PM 1 1 4 4 5
Hourly Total 33 33 30 30 0
3:00PM 13 13 4 4 17
3:15PM 17 17 3 3 20
3:30PM 8 8 4 4 12
3:45PM 14 14 14 14 28
Hourly Total 52 52 25 25 0
4:00PM 20 20 12 12 32
4:15PM 12 12 10 10 22
4:30PM 16 16 8 8 24
4:45PM 10 10 15 15 25
Hourly Total 58 58 45 45 0
5:00PM 8 8 4 4 12
5:15PM 16 16 7 7 23
5:30PM 6 6 9 9 15
5:45PM 9 9 3 3 12
Hourly Total 39 39 23 23 0
6:00PM 13 13 4 4 17
6:15PM 6 6 6 6 12
6:30PM 23 23 13 13 36
6:45PM 31 31 4 4 35
Hourly Total 73 73 27 27 0
7:00PM 19 19 19 19 38
7:15PM 12 12 8 8 20
7:30PM 32 32 6 6 38
7:45PM 30 30 12 12 42
Hourly Total 93 93 45 45 0
8:00PM 24 24 13 13 37
8:15PM 21 21 10 10 31
8:30PM 15 15 2 2 17
8:45PM 1 1 1 1 2
Hourly Total 61 61 26 26 0
9:00PM 3 3 3 3 6
9:15PM 0 0 5 5 5
9:30PM 2 2 6 6 8
9:45PM 1 1 5 5 6
Hourly Total 6 6 19 19 0
10:00PM 0 0 0 0 0
10:15PM 0 0 1 1 1
10:30PM 4 4 2 2 6
10:45PM 4 4 0 0 4
July 21, 2020
Item #7 Page 47 of 157 2 of 13
Leg
Direction
North
Southbound
South
Northbound
Time T App T App Int
Hourly Total 8 8 3 3 0
11:00PM 0 0 2 2 2
11:15PM 1 1 2 2 3
11:30PM 0 0 0 0 0
11:45PM 0 0 2 2 2
Hourly Total 1 1 6 6 0
2018-08-11 12:00AM 0 0 0 0 0
12:15AM 0 0 0 0 0
12:30AM 0 0 0 0 0
12:45AM 0 0 0 0 0
Hourly Total 0 0 0 0 0
1:00AM 0 0 0 0 0
1:15AM 0 0 3 3 3
1:30AM 0 0 0 0 0
1:45AM 0 0 0 0 0
Hourly Total 0 0 3 3 0
2:00AM 0 0 0 0 0
2:15AM 0 0 0 0 0
2:30AM 0 0 0 0 0
2:45AM 0 0 0 0 0
Hourly Total 0 0 0 0- 0
3:00AM 0 0 0 0 0
3:15AM 0 0 0 0 0
3:30AM 1 1 3 3 4
3:45AM 1 1 0 0 1
Hourly Total 2 2 3 3 0
4:00AM 0 0 0 0 0
4:15AM 0 0 0 0 0
4:30AM 0 0 0 0 0
4:45AM 0 0 0 0 0
Hourly Total 0 0 0 0 0
5:00AM 0 0 0 0 0
5:15AM 0 0 0 0 0
5:30AM 0 0 1 1 1
5:45AM 3 3 1 1 4
Hourly Total 3 3 2 2 0
6:00AM 1 1 2 2 3
6:15AM 3 3 2 2 5
6:30AM 7 7 4 4 11
6:45AM 7 7 1 1 8
Hourly Total 18 18 9 9 0
7:00AM 7 7 6 6 13
7:15AM 8 8 11 11 19
7:30AM 8 8 8 8 16
7:45AM 7 7 5 5 12
Hourly Total 30 30 30 30 0
8:00AM 8 8 19 19 27
8:15AM 21 21 19 19 40
8:30AM 11 11 13 13 24
8:45AM 10 10 5 5 15
Hourly Total 50 50 56 56 0
9:00AM 15 15 12 12 27
9:15AM 14 14 18 18 32
9:30AM 18 18 8 8 26
9:45AM 2 2 1 1 3
Hourly Total, 49 49 39 39 0
Total 859 859 575 575 14 34
% Approach 100% - 100% - -
% Total 59.9% 59.9% 40.1% 40.1% -
Pedestrians 0 0 0
July 21, 2020 Item #7 Page 48 of 157
3 of 13
Leg
Direction
North
Southbound
South
Northbound
Time T App T App Jut
% Pedestrians 0% 0% 0% 0% 0%
Pedestrians 859 859 575 575 1434
"A Pedestrians 100% 100% 100% 100% 100.0%
*T: Thru
July 21, 2020 Item #7 Page 49 of 157
4 of 13
Page 121
Appendix B
Vegetation Constraints Memorandum
Carlsbad ADA Beach Access
ieirlEtl ARYAN Item #7
vgailAbi.M7
AECOM AECOM
401 West A Street
Suite 1200
San Diego, CA 92101
www.aecom.com
619.610.7600 tel
619.610.7601 fax
Memorandum
To Matt Capuzzi, Chen Ryan
Page 1
CC
Subject
ADA Accessibility - Vegetation Constraints Review
From Cindy Kinkade, AECOM
Date
December 20, 2018
Various siting options for ADA access to Carlsbad State Beach along Carlsbad Boulevard between
Pine Avenue and Tamarack Avenue are currently being considered. One consideration in siting may
be quality and density of native vegetation along the existing bluff. To aid in siting considerations that
may minimize impacts to native habitats, this qualitative assessment was conducted of bluff habitats
supporting native plants along the coastal bluffs in the project vicinity. Bluffs in the project area have
received various levels of habitat restoration/enhancement in recent years through the coordinated
efforts of the City of Carlsbad, Carlsbad State Park, and community volunteers. These restoration
activities have included the installation of irrigation systems, the planting of native species, and the
treatment and removal of invasive species. Specific areas within the proposed project area continue
to be characterized by sparse vegetation and/or bare patches and/or the presence of non-native or
invasive species.
This assessment included a field inspection of the site to determine species composition and relative
cover values for native plants, non-native plants, and unvegetated areas. Bluff habitats were divided
into areas (polygons) of similar cover proportions and depicted on a map (attached). Relative cover
values (totaling 100%) were assigned to each polygon by visual inspection of recent aerial imagery
(SANDAG 2017) and comparison to a California Native Plant Society cover diagram
(https://cnps.oro/wp-content/uploads/201 8/03/percent cover diag-cnps.pdf).
Common native species observed in the study area included coast prickly pear (Opuntia littoralis),
California fuchsia (Epilobium canum), seacliff buckwheat (Eriogonum parvifolium), California boxthorn
(Lycium californicum), coastal goldenbush (lsocoma menziesii), coast cholla (Cylindropuntia
prolifera), and California encelia (Encelia califomica). Common non-native species observed
included, ngaio (Myoporum laetum), sea lavender (Limonium perezii), and natal plum (Carissa
macrocarpa).
On the basis of the relative cover values, each of the 12 mapped polygons was then ranked from
highest potential impact to native plant resources (Rank of 1) to lowest potential impact to native plant
resources (Rank of 12) on the basis of the assigned cover value using the following assumptions:
• Higher relative cover value of native plant implies higher potential impacts
• Higher relative cover value of non-native plants implies lower potential impacts
• Higher relative cover value of unvegetated implies lower potential impacts
The assigned cover values and overall rank are presented in the attached table, and a graphical
representation of the overall ranking is presented in the attached figure.
July 21, 2020 Item #7 Page 51 of 157
Vegetation Polygon
(North to South) Vo Cover N .0/ - % Cover NonNativ- % Cover Unve:etate. Rank
AECOM
A 20 5 75 8
B 15 5 80 11
C 60 10 30 4
D 35 10 55 6
E 80 0 20 3
15 5 80 9
G 15 0 85 10
H 0 60 40 12
I 80 5 15 1
J 80 15 5 2
K 25 15 60 7
L 75 0 25 5
The vegetation assessment provides a ranking for potential habitat impacts associated with
construction of ADA access along Carlsbad Boulevard. Polygons with the highest ranking
(red on the attached figure) would result in the lowest degree of impact to native and/or
dense vegetation along the bluffs, while those with lower rankings (green on the attached
figure) represent those areas that should be avoided if feasible. For example, Polygon I has
the lowest ranking of 1 and would result in the highest amount of impacts to native and/or
dense vegetation, therefore this area should be avoided if possible. Polygon H has the
highest ranking of 12 and would result in the least amount of impacts. Impacts to this
resource represent one consideration among many, and may help inform siting efforts for
the proposed project. Please feel free to contact me at (619) 610-7801 or
cindy.kinkade@aecom.com to discuss the project and we will expedite any requests for
additional information.
Sincerely,
Cindy Kinkade
AECOM Project Manager
Attachments:
ADA Accessibility Habitat Value Assessment Map
July 21, 2020 Item #7 Page 52 of 157
LOZ OVONVS :ownos Path: P:\ 6058\60586864 CbadADABeach\900-CAD-GIS\920 GIS\mao dons \mxd\Carlsbad Habitat Value Rank mxri naul mnrenn 12/20/2018 3:13:10 PM
!
nr'; '54 7,4
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00 0 CO 0 03 CT) 0 0
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Ui U-1 1-x 0 0 0
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I-A NJ W NJ U1 C11 •••...1 00 03 00 -P % Cover Unvegetated U1 U1 00 01 U1 0 U1 0 0100
ic7 > I I G) :Vegetation Polygon
Page 122
Appendix C
Existing Conditions Analysis
Carlsbad ADA Beach Access
Jeir1Et1 RYAN Item #7 VgaileigtX.OM7
•
kILL,
0 A
L7.71 _
,... .............. ____....,
••••.__.
e,0,14,••••V
....... _ :/..S...:r. A; 4,.......:...„1..g., ....". •iriz,..., ,40.,............" - - 'P.: ' -'4 . 41.4.- t
...
: ilr' ' ':,,,-..=-,,,,,..- ..,,-,-..."....„ 4.. ` , .1.,01
' k400111:0„- .-•-••••••
"'eel, 'Noe .................. ....
Kr,— ea
REQUIRED RAelr MITTS& FT
INP4-‘; .074114,;••!...
0. 4?
-.74:41v
0
441
AIR ELEVA.113. 20.3 FT REQUIRED RAMP LENOIR 431.0 FT
Slop s Table
Number Minimum Slope MORIMUM SlOpe Color
1 0 4:1 a
2 4:1 2.5:1
3 2.5:1 2:1 ll
4 GREATER THAN 2:1 .
(City of
Carlsbad CHEN •ORYAN
Carlsbad ADA Beach and Lagoon Access Feasibility Study
Sheet 1 of 5
SCALE: 1..20' LST 10 SS aed
Carlsbad ADA Beach and Lagoon Access Feasibility Study
:g
•k, GREATER MAN
July 21, 2020 Item #7 Page 56 of 157
SEE SHEET 4
64 Carlsbad ADA Beach and Lagoon Access Feasibility Study I •
L71 CHEN*RYAN PFd
112) • Cr) cs)
'•••••.)
Item #7 Page 57 of 157
t/
July 21, 2020
SEE MATCHLINE BELOW
- • -
Slopes Table
Number Minimum Slope Maximum Slope Color
0 1.
2 4:1
2.45:1
:1
3 2.5:1 2:1 III
4 CREAlER 'MAN 2:1 E
20'
SCAM 1,•20'
(City of
Carlsbad
Carlsbad ADA Beach and Lagoon Access Feasibility Study
CHEN RYAN Sheet 4 of 5
LSI 10 65 aSed (City of
Carlsbad Sheet 5 of 5 CHEN RYAN
Carlsbad ADA Beach and Lagoon Access Feasibility Study
CARLSBAD BLVD
IN ATON — 13.0 FT , REWIRED MAP LENGTH 2,32.0 FT
4 ELEVA1101.1 = REQUIRED RAMP LENGTH .— 97.0 FT
Slopes Table
Number Minimum Slope Maximum Slops Color
1 0 4:1 II
2 4:1 2.5:1
3 25:1 2:1
4 GREATER THAN 2:1 111
SCALE: 1..313.
Page 123
Appendix D
Pine Avenue and Tamarack Avenue Ramp Options
Carlsbad ADA Beach Access
Jetim RYAN Item #7 VgatOiallY7
11707 `17 Alnr •
1
r---- (:_,_l__
\ 1\
\
\
Z.71_
CD
ID
3
4 id gAmr
2,78=01—
PINE AVE RAMP 71-1-1
SCHMIDT
DESIGN
GROUP
Re,ecran.51... Suite G. San Dago,... 419.23.62 DC. CA 2138 NW 219132 34139
SCitAlltalASIGN.CONI
CARLSBAD BEACH AND LAGOON
CARLSBAD, CA
0 10 20 40
SCALE 1' = 20-0'
Project Number: 18-106
Date: June 3, 2019
/
1
- `N,.`, • f
I
1_1
__--), j-------/ --,-)-7----,, ...)„..,,, , -- '--------------- -------1, -------- -- ----- ------- 1 - -
.---•
----).—.
..__
--, (7,1\l'N
r_
NN
---:::—N— ---------- s\--- ----
--- -
----
_,„). ----------,, --_, ....__ ---.. -7---,-- - -------------. , ---________ ------- ----4 -, / ,..,... -
_
...„..„.... _.,,,
:,.,., ,..- '----_ .)------`- "-------
-,„,7 ---------_____!---, ------
2.5' .14^tq
-14115--RA0N- -
RIAE AVE-. OM
,
aemcif _
1 /F
SCHMIDT
DESIGN
GROUP
1310 If osccran.11., Suf. Dfcgo.1, 92fOff 51,23E102
US. 552154J fIV 2191 152 34139
501,110lIASIGry.0041
PINE AVE RAMP
CARLSBAD BEACH AND LAGOON
CARLSBAD, CA
7177 C
o,
0 10 20 40
SCALE 11= 20-0
Project Number: 18-106
Date: June 3,2019
11707 '17 Alnf ‘5, \
/
Li
,
_
' —
'
)
aI
I/O' game
rhrVa OP", 3--
- Te —
SCHMIDT
DESIGN
GROUP
PINE AVE RAMP
CARLSBAD BEACH AND LAGOON
CARLSBAD, CA
0 10 20 40 "ly
SCALE: V= 2004.
Project Number: 18-106
Date: June 3, 2019
1.110 No, ccran: SI., Suite G. San Dom CA 9.2100 619.236.1062 DC..213811. 21910431139
1-9
4. •
-
I _ 44.
-
—
--- - —_____--
-- — — N ],. ' \ _____— --________ --------------__
-----. —
...::--------____-- -----... -------____
----__ -------. ,--- ' • -/ — _
— --- ----- \ ----___ ---------
..
22Z'
- ,39 2.5' SZASe-. LAvsmil,
PINE AVE RAMP SCHMIDT
DESIGN
GROUP
1310 liosucrom Suitc CA.100 619.236.1452 ULU, 208 I NV 2191, 31139
SO.10 MESIGN.C-01,1
CARLSBAD BEACH AND LAGOON
CARLSBAD, CA
0 10 20 40
SCALE] V, 20,01
Project Number: 18-106
Date: June 3,2019
,
p
15)
RELOCATE EXISTING BENCHES
2----.--, • -/
, — -- _,—.-.— - .: --- -----_,—,_----------:, ----7-1,, ,
..._--
---:-:---:,---Lz__-- --------_-__::: ------',7`'-
-----.-----, ------- -___-----------_ -.1._ ----------
'' ----------:::>--- -
.-
445
EXISTING RAY STATION /
RELOCATE EXISTING SIGNAGE
\ \ \ \\
\ \ \ \
\
u910 401, SCHMIDT
0 I- • • II*
1310 Nsecraol St., OwN bi9,3c,.1462
L,C. CA 213E I NV 2131 AZ
SCHMID-MEM
DESIGN
GROUP
a San CA 32500
34139
TAMARACK - OPTION 1 (10' wide) 10 20 40
SCALE: V =
Project Number: 18-106
Date: March 6, 2019
CARLSBAD BEACH AND LAGOON
CARLSBAD, CA
,cca
.44 44.
/ /
„/""
vJ / /'
4. N.
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+16
40
SCHMIDT
DESIGN
G-ROUP
1310 flusecranA, Sime C, Sin Diego. CA 92100
LiE
61,3,1492
C A 213£ I NV 219 AZ 34139.
5C19311090E5J6IC000
0 10 20
SCALE
TAMARACK - OPTION 2 (6' wide)
CARLSBAD BEACH AND LAGOON
CARLSBAD, CA Project Number: 18-106
Date: March 6, 2019
TAMARACK - OPTION 2 off wide)
CARLSBAD BEACH AND LAGOON
CARLSBAD, CA
WI Oh * •
SCHMIDT
DESIGN
GROUP
1310 Aosta.. St,. iwle G. 'isn Diem CN 92,0G 019_201,.1462
LIC. CA 2130 I NV 219142 34189
0 10 20 40
SCALE : 1" =20-0
Project Number: 18-106
Date: March 6, 2019
Page 1 24
Appendix E
Pine Avenue and Tamarack Avenue Ramps
Carlsbad ADA Beach Access
•IrlEt1 -ARYAN Item #7 Vg.a1a(-7
N.1
NJ
0 NJ
N. •
N
—
T.ErarfR)
,,-- N---- S7,3;k7---oF—A..W.,ElfbLE --
_____.--------- \ ......,....—.
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v_ivotmei---T5En);
129.6.
END or ACC.E.111N-"E 12pe,1P
-12Eirr...‘1e Q.XISTirio 04154ER.
41110 SCHMIDT
DESIGN
GROUP
PINE AVE RAMP 17-7-1
0 10 20 90
1310 INNtrans N.. Suite G. SN1 91106 619.234.1.16.2 CARLSBAD BEACH AND LAGOON SCALE: 1 = 20'-01
AC CA DIM I NV 219102 04139
CARLSBAD, CA Project Number: 18-106
Date: July i, 2019
4.5,0"-RAMP_
ON GRADE v-
39
'EXISTING GUARD
RAW ND
,
TOJtE_MAIN
RELOCATETRASH HERE
+24.975
--
PORTION OF --- PATHWAY TO BE
ELEVATED OVER PORTION OF PATHWAY
SLOPE TO BE ON GRADE
Sare. '..77W111.1m44 EXISTING PAVING W RETAINING
ALL VARIES 12,42"HT ROAD
ALLOW FOR
PEDESTRIAN SIDEWALK
EXISTING SEATWALL
TO REMAIN
EXTEND SIDEWAL
TO PARKING
EXISTING BLUFF TO REMAIN
2331/..--,nr233
NEW STAIRS
CARLSBAD BOULEVARD •
• EXISTING PLANTER • NEW.PUNTiNG AREA WIT
VA RAILING .
H ER 0" RAMP ON
TRUCTURAL COLD TABLE
EXISTING SEAWALL
EXISTING LIFEGUARD TOWER
\ • r
116 SCHMIDT
01110ilt
DESIGN
GROUP
TAMARACK RAMP BEACH ACCESS 71-1-7
0 10 20 40
1310K342343 5,931114 V San 0240 CA 92106 CARLSBAD BEACH AND LAGOON SCALE: 61923,1462
AC. CA 21221 NV 21914234119
54310.131119399143120131 CARLSBAD, CA Project Number: 1B-106
Date: April 5,2019
Page 125
Appendix F
OPCC and Structures Estimate
Carlsbad ADA Beach Access
iCi71Et1 ARYAN Item #7 We* OM7
Carlsbad ADA Beach Access Feasibility Study
Opinion of Probable Construction Costs
ADA Beach Access
Type from Carlsbad
Structural
Raised ramp (1) supported on pile extensions at each landing
Lump Sum $1,700,000.00
Civil
Site Prep, Clearing and Grubbing, Traffic Control, Staging,
Erosion Control, Staking, Utility Adjustments, BMPs
Lump Sum $500,000.00
Landscape & Aesthetics
Landscape, Irrigation, Custom Railings, Etc.
Lump Sum $300,000.00
Engineering & Environmental
CEQA and PS&E
Lump Sum $300,000.00
TOTAL $2,800,000.00
Cost includes 25% contingency
Cost does not include escalation LSI 40 zz. aed
$ 1,547,000
$ 1,600,000
-•"•YL.ININTERNATIONAL Carlsbad ADA Beach Access Feasibility Study D. Kasawdish
Preliminary Structures Cost Estimate 2/20/2019
E..1. ADA Beach Access from Carlsbad Boulevard
iv Structure Type: Raised ramp supported on pile extension at each landing.
Ramp Length
Ramp Width
Ramp Area=
Cost/ SF=
Structure Cost=
For Budget, Use
476 ft Based on information provided by Chen Ryan Associates via email on 1/2/19.
10 ft As requested by City during February PDT meeting
4,760 SF
Based on previous projects with similar structure type and Caltrans Comparative Bridge Costs,
325 scaled by the appropriate Bridge Cost index ratio. 48" CIDH Piles assumed at each landing.
Includes 25% Contingency
CD
3 LSI JO EL aed
Page 126
Appendix G
Environmental Constraints Table
Carlsbad ADA Beach Access
icom RYAN
Item #7 FgaiMOM7
74, CD CST JO SL aSed Carlsbad ADA Beach Access Feasibility Study — Environmental Constraints Analysis Table
Alternatives Summary
The Pine Avenue Americans with Disabilities Act (ADA) Ramp project would involve constructing an ADA compliant ramp that begins at the parking lot north of the intersection of Pine Avenue and Carlsbad Boulevard. The 1.3 389-foot ramp would change direction once, extending the pathway southward within the bluffs. The ramp would be designed with an incline of 7.8 percent. One bench would be installed at the top of the ramp to provide a
viewing point for the public. The ramp would be elevated as it descends the bluff, ranging at distances of approximately 2 to 9 feet above the existing bluff below. Two or three disabled parking places would be designated in
the existing parking lot.
The proposed Tamarack Avenue ADA Ramp is approximately 3,500 feet south of the Pine Avenue ADA Ramp, across from the intersection of Tamarack Avenue and Carlsbad Boulevard. The ramp would begin at the top of
the bluff near existing facilities (i.e., showers, plaza, and restrooms) and would extend southward, parallel to the existing access road to the California State Parks (State Parks) parking lot. Current facilities at this access
point are not ADA accessible. Construction of the Tamarack Avenue ADA Ramp would create an ADA compliant pathway and would generally improve public access to the beach and Lower Sea Wall at this access point.
The existing road/sidewalk south of the proposed ramp would remain the same. Additionally, the existing staircase located perpendicular to the new ramp would be reconstructed. A portion of the ramp would be elevated
along the bluff (approximately 60 percent) ranging between 2 and 5 feet above the existing bluff. The ramp would be 196 feet, starting at the access to the existing restroom, and have an inane of 7.5 percent. The existing
ramp down to the restrooms would also be rebuilt to be ADA compliant The design of the Tamarack Avenue Ramp uses existing access points and disturbed areas to the extent possible in order to minimize impacts to the
previously undisturbed bluff.
Issue Area Existing Conditions/Assumptions Pine Avenue ADA Ramp Tamarack Avenue ADA Ramp Constraints Summary
Aesthetics •
•
The existing bluff is mostly unvegetated at the
proposed Pine Avenue ADA Ramp location, while
the majority of the bluff is vegetated (planted) near
the Tamarack Avenue ADA Ramp.
There are no designated scenic resources in the
area,
•
•
•
Construction of the ramp would
begin at the existing parking lot
elevation (i.e., would not rise higher
than current bluff elevation). '
Landscaping of native vegetation
would be established adjacent to
ramp.
Design would be less intrusive
compared to other existing
structures of stairs along this
segment of beach, since this ramp
would be built closer to grade along
the slope of the bluff as compared
to existing staircases along the
coastline.
•
•
•
Construction of the ramp and
staircase would begin at the same
level of existing facilities and would
not rise higher than the current bluff
elevation,
Landscaping of native vegetation
would be established adjacent to
ramp.
The existing staircase would be
updated, which is built to grade
along the bluff.
•
•
Overall, the difference in aesthetics between both options
would be minimal aside from the existing staircase which
would remain built to grade along the bluff. However, the
Tamarack Avenue ADA Ramp incorporates planting to
complement the existing facilities area. The raised
structures could be perceived as large from vantage
points along the beach. However, these structures would
be less intrusive compared to the existing staircases
along this section of coastline and impacts would be
minimal.
Both options would not interfere with pedestrian/traffic
views of the coastline.
Air Quality • It is assumed that no operational sources are
associated with either option; therefore, only
construction impacts are evaluated.
• Potential impacts due to
construction would be temporary,
Standard construction equipment
• Potential impacts due to
construction would be temporary,
Standard construction equipment
• Potential air quality impacts related to construction of the
proposed ramps would be similar between the two
projects.
• Sensitive receptors are not located in the vicinity of
the proposed projects,
would be used and applicable
avoidance and minimization
measures would be implemented.
would be used and applicable
avoidance and minimization
measures would be implemented,
•
•
Air quality emissions associated with the proposed
projects include emissions from construction. However,
operations associated with construction would minimize
emissions through standard construction measures,
storm water pollution prevention plan measures, and best
management practices.
It is assumed im pacts would not occur to sensitive receptors as none are located in the vicinity of the proposed projects.
1
LSI 40 9L @Bed Carlsbad ADA Beach Access Feasibility Study— Environmental Constraints Analysis Table
Issue Area Existing Conditions/Assumptions Pine Avenue ADA Ramp Tamarack Avenue ADA Ramp Constraints Summary
Biological • In the Vegetation Constraints Review Memo • Equipment staging during • Equipment staging during • The Pine Avenue ADA Ramp would have a slightly larger
Resources prepared by AECOM for the proposed projects, the
North of Pine Avenue Ramp footprint evaluated
construction would most likely
occur in existing developed areas
construction would most likely
occur in existing developed areas.
impact area compared to the Tamarack Avenue ADA
Ramp as the design of the ramp is primarily focused on
along this section of bluff is identified as 20% (e.g., parking lot at top of ramp). • Impacts to vegetation may occur an undisturbed segment of bluff. Design of the Tamarack
•
natives, 5% nonnatives, and 75% unvegetated
(AECOM 2018a). This area has a ranking of 8 out
of 12 (where a rank of 12 is the lowest potential
impact to native plant resources). The Tamarack
Avenue Ramp footprint covers two areas identified
in the memo, known as I and J. These areas
encompass 80% native, 5% nonnative, 15%
unvegetated and 80% native, 15% nonnative, 5%
unvegetated, respectively. They rank 1 and 2 for
potential habitat impacts (where a rank of 1 is the
highest potential to impact native plant resources).
Endangered, threatened, or proposed for
listing/rare wildlife are not known to use the
proposed project site since habitat is low quality,
fragmented vegetation interspersed with sandy bluff
too minimal to support species.
•
•
Impacts to vegetation may occur
with installation of the ramp (e.g.,
vegetation removal).
Once constructed, the shadow
created by the ramp may shade
vegetation and could potentially
inhibit plant growth,
•
with installation of the ramp and
staircase (e.g., vegetation
removal),
Once constructed, the shadow
created by the elevated portions of
the ramp may shade vegetation
and could potentially inhibit plant
growth. The existing staircase that
would be updated as part of this
design is currently at grade and is
not expected to contribute to
shadowing effects from vegetation.
•
Avenue ADA Ramp incorporates the existing access
footprint to the extent possible. For example, the existing
staircase at the Tamarack Avenue ADA Ramp is in need
of repair and upgrades are proposed to the existing
structure within the previously disturbed footprint.
Additionally, the new ramp which would provide access to
the existing restrooms and associated improvements are
within previously disturbed areas.
In both options, vegetation is proposed along the access
ramp. The ramp footprint in the Pine Avenue ADA Ramp
would impact more undisturbed bluff than the Tamarack
Avenue ADA Ramp. However, while more undisturbed
bluff is expected to be impacted at North of Pine Avenue,
this area is of lesser habitat value than the cover type
existing in the vicinity of the Tamarack Avenue ADA
Ramp (AECOM 2018a). The Tamarack Avenue ADA
•
•
Implementation of both projects would avoid the
aquatic environment,
This area is not located within the City of Carlsbad's
Habitat Management Plan (HMP) and is not
designated as a significant wildlife corridor (City of
Carlsbad 2004).
Ramp design uses existing infrastructure at the staircase
and north of the public facilities, which would minimize
impacts to previously planted vegetation. Since
vegetation in the Tamarack Avenue Ramp footprint has
grown in successfully, this recruitment shows temporary
vegetation impacts along the bluff could be successfully
established post-construction. Best management
practices would be implemented to ensure plant
establishment along the bluff in both locations.
• Neither proposed project footprint functions as a
terrestrial wildlife movement corridor. The movement of
marine species would not be affected by the proposed
projects' activities, as there would be no permanent or
temporary blockage of the open water corridor. No
impacts are anticipated to wildlife movement/corridors
with implementation of either project.
• Avoidance and minimization measures would be
implemented to minimize potential impacts to wildlife
species, if found, such as clearance surveys for birds or
other sensitive species (e.g., silvery legless lizard, a
California Department of Fish and Wildlife species of
special concern) as required, or vegetation removal
outside of the breeding season.
Cultural/Tribal • A previous records search was conducted in the • The proposed project would be • For the most part, the proposed • Standard surveys, analysis, and mitigation measures
Cultural vicinity of the proposed projects for the Carlsbad constructed on previously project would be constructed on (e.g., consulting a qualified archaeologist and a Native
Resources Boulevard and Tamarack Avenue Improvement
Project in 2017 (AECOM 2018b). The records
search area encompassed all of the Tamarack
Avenue ADA Ramp option and a portion of the Pine
undisturbed bluffs known as the
Santiago Formation (AECOM
2018b). Potential for impact could
occur if a previously unknown
previously disturbed ground,
although excavation for
footings/foundations could extend
into previously undisturbed bluff
American representative, if applicable) would be
implemented prior to and during construction because
cultural sites have been identified within a 0.5-mile radius
of the proposed project areas, and the coastal region of
2
NJ
J."
NJ 0 NJ 0 LSI 40 LL aed Carlsbad ADA Beach Access Feasibility Study — Environmental Constraints Analysis Table
Issue Area Existing Conditions/Assumptions Pine Avenue ADA Ramp Tamarack Avenue ADA Ramp Constraints Summary
•
Avenue ADA Ramp footprint The previous records
search indicated 20 studies have been conducted,
four cultural resources were previously recorded,
and one cultural resource was identified during a
pedestrian survey, all within a 0.5 mile vicinity of the
proposed projects. After consulting with the Native
American Heritage Council, it was determined that
no Native American places or sites were on file in
the vicinity of the proposed project sites,
One cultural resource has been identified within the
Tamarack Avenue ADA Ramp option footprint,
known as the Tamarack Avenue Comfort Station. A
historical background study and determination of
eligibility was prepared in 2016 and indicated that
the Comfort Station is potentially eligible for listing
on the California Register of Historical Resources
and National Register of Historic Places (AECOM
resource was discovered during
ground disturbing activities.
formations (e.g., Santiago
Formation). Potential for impact
could occur ifs previously unknown
resource was discovered during
ground disturbing activities,
•
•
San Diego County retains a high level of cultural
sensitivity to Native American tribes (AECOM 2018b).
If feasible, project design would avoid the Comfort Station
at the Tamarack Avenue ADA Ramp; the proposed
project would provide ADA access as well as improved
general public access to this structure.
The Pine Avenue ADA Ramp may present more of an
opportunity to encounter unknown resources since more
ground disturbance would occur on undeveloped bluff.
Both options would follow standard procedures for
protecting cultural resources.
2018b; Bevil 2016).
• Separate record and Sacred Lands File searches
could be completed to confirm cultural and/or tribal
cultural resources are not in the proposed footprint
for the Pine Avenue ADA Ramp. Given the recent
results in the Cultural Resources Phase 1 Survey
Report conducted for the Carlsbad Boulevard and
Tamarack Avenue Improvement Project, it is
assumed cultural and/or tribal cultural resources
are not in the vicinity of the Pine Avenue ADA
Ramp.
Geotechnical/G • There are no active faults identified through • The proposed project would be • The majority of the proposed • Although loss of topsoil from project implementation is not
eology Carlsbad, and the California Geologic Survey does
not include Carlsbad on list of cities affected by the
Alquist-Priolo Earthquake Fault Zones. However,
Carlsbad is in a seismically active region and is
subject to ground-shaking during an earthquake.
constructed on a previously
undeveloped site where soil
removal would be required to install
piles for the elevated ramp design,
Potential impacts could occur with
project would be constructed on a
previously developed site and
generally the same footprint as the
existing walkway and staircase.
Potential impacts could occur with
anticipated to be substantial, and erosion would most
Rely decrease with project implementation due to
reduced use of informal trails, in order to minimize the
potential impacts of soil erosion or the loss of topsoil,
avoidance and minimization measures would be adopted
•
•
Geotechnical stability analyses were performed,
indicating the coastal bluffs in the project area
currently have adequate factors of safety against
deep instability and would not be located on an
unstable geologic unit or on expansive soils
(AECOM 2016a).
As stated in the General Plan, the city of Carlsbad
is located within the coastal portion of the
soil removal, which would be
required to install piles for the
elevated ramp design,
soil removal, required to install
piles for the elevated ramp design.
with implementation of both options (e.g., erosion control
and revegetation/planting plan, City review of site grading
plan to ensure compliance with code requirements). The
proposed project may decrease informal trail use,
especially in the vicinity of the Pine Avenue ADA Ramp,
which contributes to substantial soil erosion estimated to
be approximately 1 foot per year along the northern part
of the bluffs (AECOM 2016b).
Peninsular Ranges Geomorphic Province, a region
characterized by northwest-trending structural
blocks and intervening fault zones (City of Carlsbad
2015a). The proposed project areas consist of fill
material and terrace deposits where the base of the
bluffs is characterized by the Santiago Formation
and relatively resistant sandstone forms the lower
•
•
Both options would adhere to all applicable building and
seismic codes and regulations therefore, not exposing
people or structures to potential substantial adverse
effects, including risk of loss, injury, or death due to
severe ground shaking.
Due to the nature of the site as described under existing
conditions, impacts related to increased slope instability,
3
LSI 10 8L aSed Carlsbad ADA Beach Access Feasibility Study — Environmental Constraints Analysis Table
Issue Area Existing Conditions/Assumptions Pine Avenue ADA Ramp Tamarack Avenue ADA Ramp Constraints Summary
portion of the bluff (AECOM 2016a). Pleistocene
terrace deposits compose the upper portion of the
bluff, above an elevation of approximately 8 to 12
feet above mean sea level (AECOM 2016a).
landsides, or other adverse seismic-induced geologic
hazards are not anticipated.
Greenhouse • It is assumed that no operational sources are • Standard construction equipment • Standard construction equipment • GHG emissions related to construction of the project
Gas Emissions
•
associated with either project; therefore, only
construction impacts are evaluated,
The City of Carlsbad adopted a Climate Action Plan
would be used and standard
emissions controls would be
implemented.
would be used and standard
emissions controls would be
implemented.
would be similar between projects. Similar cqnstruction
equipment would likely be used, and vehicle trips to the
construction site would be similar.
(CAP) that outlines actions that the city will
undertake to achieve its proportional share of the
state greenhouse gas (GHG) emissions reductions,
The CAP is a plan for the reduction of GHG
emissions in accordance with California
Environmental Quality Act (CEQA) Guidelines
Section 15183.5. Pursuant to CEQA Guidelines
Sections 15064(h)(3), 15130(d), and 15183(b), a
project's incremental contribution to a cumulative
• Both options are expected to be in compliance with the
Carlsbad CAP and would not emit at or above the CAP
screening threshold of 900 metric tons of CO2 equivalent,
as outlined in the CAP Consistency Checklist.
Additionally, both options' incremental contribution to a
cumulative GHG emissions effect would not be
considered cumulatively considerable, because they
would comply with requirements of the CAP.
GHG emissions effect may be determined not to be
cumulatively considerable jilt complies with the
requirements of the CAP.
Land Use • Both proposed projects are surrounded by
residential development to the east and the Pacific
Ocean to the west. Both options are in the coastal
zone and subject to regulations per the California
• The proposed project would comply
with applicable land use policies
and guidelines,
• The proposed project would comply
with applicable land use policies
and guidelines,
• Both options would conform to applicable land use
policies and guidelines (e.g., Coastal Act) and
appropriate resource agencies would be involved during
the permitting process (e.g., California Coastal
Coastal Act. Commission, California State Parks).
• Proposed ramp improvements are located at
Carlsbad State Beach, which State Parks has
jurisdiction over,
• Proposed ramps would establish ADA compliant features
along the bluff, improve general public access to the
beach, and would be consistent with existing land use
and recreation for the area.
Noise •
•
•
It is assumed that no operational sources are
associated with either option, therefore only
construction impacts are evaluated,
The closest noise sensitive receptors to the Pine
Avenue ADA Ramp is a single-family residential
structure located approximately 150 feet north of
the site and multi-residential units approximately
150 feet east of the nearest construction boundary.
The closest noise sensitive receptor to the
• Noise impacts associated with
construction would be temporary
and standard construction
equipment would be used.
• Noise impacts associated with
construction would be temporary
and standard construction
equipment would be used,
•
•
Construction equipment and techniques used would be
similar or the same for both projects. Potential impacts
due to construction noise would be similar or the same for
both projects.
During construction of both projects, noise minimization
measures would be implemented and local noise
ordinance would be followed as detailed in Chapter 8.48,
Noise of the City of Carlsbad Municipal Code, which sets
limitations for construction hours.
•
Tamarack Ramp Avenue option is a multi-
residential structure located approximately 250 feet
southeast of the project limits,
Given the open space and recreational nature of
both proposed project sites, public using the beach
could be considered a sensitive noise receptor
during construction.
• While the public using the beach during construction
hours may experience higher noise levels anticipated with
construction, other portions of the beach where
temporary construction noise could be avoided will
remain open for use.
Recreation • Existing informal trails are located along the Pine
Avenue ADA Ramp footprint,
• Construction would temporarily
interrupt access via informal trails.
During construction, multiple
access points along the coastline
• Construction would temporarily
interrupt recreation and access to
the beach and facilities at this
location. Additionally, multiple
• Localized recreation and public access would be
temporarily interrupted during construction of both
projects; however, impacts between the two projects
would be similar. Portions of parking lots may be
4
Carlsbad ADA Beach Access Feasibility Study — Environmental Constraints Analysis Table
Issue Area Existing Conditions/Assumptions Pine Avenue ADA Ramp Tamarack Avenue ADA Ramp Constraints Summary
• There are multiple existing access points along this
portion of coastline, none of which are currently
ADA compliant,
could continue to be used to
access the beach.
access points along the coastline
could continue to be used in order
to access the beach instead of the
current access point at Tamarack
Avenue.
•
temporarily closed in order to stage equipment.
Numerous existing access points between the two
proposed project sites would remain available for use
during construction, including the ramp at Pine Avenue
and four staircases. These existing access areas would
remain open during construction and would continue to
provide adequate access to the beach during
construction. If feasible, proposed project work would be
conducted outside of the busy summer season.
Post-construction, recreation and access would be
enhanced via the proposed ADA compliant ramps.
Sea Level
Rise/Storm
Damage
Vulnerability
• Both structures are subject to influence from sea
level rise but would be constructed along the
existing bluff above the elevation of the existing
walkway, which is protected by a sea wall,
• To the extent practicable,
structures have been designed to
provide resilience to sea level rise
scenarios.
• To the extent practicable,
structures have been designed to
provide resilience to sea level rise
scenarios,
• Structures are designed to be above the elevation of an
existing boardwalk and behind a protective sea wall,
which protects from potential storm damage and sea level
rise influence.
Transportation/
Traffic
•
•
It is assumed that no operational sources are
associated with either option, therefore only
construction impacts are evaluated.
Increased traffic to the site due to improved access
is assumed to be minimal and most likely by
existing users or residents using this improved
route to access the beach, because the proposed
project would create an ADA compliant ramp and
safer/more direct pedestrian access.
• Traffic may be temporarily
interrupted during construction,
• Traffic may be temporarily
interrupted during construction,
• Applicable measures would be implemented during
construction to avoid and/or minimize temporary traffic
impacts (e.g., timing of project work, traffic control plan).
References
AECOM
2016a Geotechnical Investigations Carlsbad Boulevard and Tamarack Avenue Pedestrian Improvements Project.
2016b Tamarack Area Coastal Improvements Project Mitigated Negative Declaration.
2018a ADA Accessibility — Vegetation Constraints Review,
2018b Cultural Resources Phase I Survey Report for the Carlsbad Boulevard and Tamarack Avenue Improvement Project.
Bevil, A.D.
2016 The Tamarack Avenue Comfort Station at Carlsbad State Beach Historical Background Study and Determination of Eligibility. On file at the California Department of Parks and Recreation Southern Service
Center.
City of Carlsbad
2004 Habitat Management Plan for the Natural Communities in the City of Carlsbad. Available at: http://www.carlsbadca.gov/civicayJfilebank/blobdload.aspx?BloblD=27193. Accessed August 2016.
2015a General Plan. Available at: http://www.carlsbadca.qov/services/depts/planning/generaLasp. Accessed July 2019.
ro 2015b General Plan and Climate Action Plan Final Environmental Impact Report. Available at: http://www.carlsbadca.qov/civicax/filebank/blobdload.asox?BloblD=28464. Accessed August 2016.
l0
0
5
Attachment B
Trail Connectivity to Tamarack State
Beach Feasibility Study
Final Report
Prepared for:
_City of
Carlsbad
Community Services
Parks & Recreation Department
City of Carlsbad
1635 Faraday Avenue
Carlsbad, CA 92008-7314
Prepared by:
CHEN *RYAN
3900 5th Avenue, Suite 310
San Diego, CA 92103
December 2019
July 21, 2020 Item #7 Page 80 of 157
Page I i
Table of Contents
1.0 Introduction 2
1.1 Overview 2
1.2 Project Background 2
1.3 Project Study Area 2
2.0 Existing Conditions 4
2.1 Carlsbad Blvd Bridge 4
2.2 Clearance under Carlsbad Blvd Bridge 5
2.3 Wave run-up study 5
3.0 Feasibility Study Approach 6
3.1 Trail Connectivity to Tamarack State Beach 6
4.0 Feasibility Study Results 8
4.1 Proposed Structure 8
4.2 Opinion of Probable Construction Costs 9
4.3 CEQA Clearance 10
5.0 Conclusion 14
List of Figures
Figure 1 Project Study Area 3
Figure 2 Open Walkway 7
Figure 3 ADA Crossing Under Exist Bridge 7
Figure 4 ADA Crossing Under Exist Road 8
Figure 5 Cold Water Cut-Cover Tunnel Rendering 11
Figure 6 Cold Water Cut-Cover Tunnel 3-D Simulation 12
Appendices
Appendix A Final Wave Runup Study
Appendix B Cost Estimate and Structures Estimate
Appendix C Environmental Constraints Table
JLQ-IplIt RYAN Trail Connectivity to Tamarack State Beach
Item #7 Nie3 ..?AuY7
Page 12
1.0 Introduction
1.1 Overview
The City of Carlsbad Community Services — Parks & Recreation Department commissioned a feasibility
study for a connection between the North Shore Agua Hedionda Lagoon Trail and Tamarack State Beach
via pedestrian walkway, tunnel, or at grade crossing.
Purpose
The purpose of the project is to provide access for all pedestrians, regardless of ability, to one of the area's
premier beaches. The importance of this project cannot be understated as it will allow the community to
enjoy a beautiful natural-resource that is unique to the region. The proposed project promotes the spirit and
vision of both the California Coastal Act and the Americans with Disabilities Act.
1.2 Project Background
Trail Connectivity to Tamarack State Beach, Project No. 40631
The Trail Connectivity to Tamarack State Beach project is located at the Cold-Water Inlet Bridge (bridge)
on Carlsbad Boulevard, south of Tamarack Avenue. The bridge is one of two waterway openings that
connect the Agua Hedionda Lagoon and the Pacific Ocean. The North Shore Agua Hedionda Lagoon Trail
runs along the north side of the lagoon. The trail's western terminus is at the north side of the bridge, where
a steep dirt pathway leads up to the east side of Carlsbad Boulevard. Tamarack State Beach lies west of
Carlsbad Boulevard and north of the bridge. Currently, there is no connection between the North Shore
Trail and Tamarack State Beach. In the existing condition, people using the trail who want to access the
beach must climb the steep dirt trail at the terminus of the North Shore Trail, walk uphill (approximately
700 feet) along the east side of Carlsbad Boulevard to Tamarack Avenue, cross Tamarack Avenue, cross
Carlsbad Boulevard, and walk down a steep asphalt pathway to the Tamarack State Beach. This circuitous
route makes for a difficult connection between these two important natural resources.
The project's main objective is to evaluate the feasibility of constructing a tunnel or undercrossing to
connect the North Shore Lagoon Trail to Tamarack State Beach. A number of alternatives were considered
and evaluated to determine engineering feasibility. The project goal is to develop a preferred alternative
for the connection between the North Shore Lagoon Trail and Tamarack State Beach.
1.3 Project Study Area
The project study area is at and adjacent to the north side of the existing bridge.
Figure 1 displays the project study area.
iCirlEt1 ARYAN
Trail Connectivity to Tamarack State Beach
Item #7 Ftag6 cifuN57
Figure 1 Project Study Area
Page 13
CO UJ
0 -h
Lfl
CHEN RYAN
Trail Connectivity to Tamarack State Beach
Feasibility Study
Page 14
2.0 Existing Conditions
Carlsbad Boulevard is positioned on a coastal bluff and is elevated from the coastal parking lot.
Approximate elevations of key features in the study area (relative to NAVD88, ft) are as follows:
• Tamarack State Beach Parking Lot: +12 to +15 (west to east)
• Carlsbad Boulevard (in vicinity of stairs at the north side of the bridge): +27
• Cold Water bridge soffit: +17
• Tamarack back beach: +12
Jurisdictionally, the City owns and operates the roadway and California State Parks owns and manages the
parking lot and beach at Tamarack State Beach. The parking lot is currently subject to seasonal flooding
and rip-rap has been placed on the seaward edge to help protect the parking lot during these events. Wave
overtopping of the parking lot was evident during a site visit on November 1, 2018 as over-washed sand
and marine debris were present on the western side of the lot. A vertical seawall begins immediately north
of the parking lot, which spans about 3,500 feet to the north where it terminates in the vicinity of Pine
Avenue.
The width of Tamarack State Beach is controlled by regional and local beach nourishment activities.
Regionally, beach widths have been impacted by two large scale beach nourishment efforts conducted by
SANDAG in 2001 and 2012. These projects are known as the Regional Beach Sand Project I and II,
respectively. These projects placed about 2.1 million and 1.5 million cubic yards of sand on San Diego
beaches. Placement of sand at two beaches upcoast from Tamarack State Beach (i.e. North Carlsbad and
Oceanside placement sites) have impacted beach width and shape at Tamarack State Beach overtime. These
upcoast placement sites received a total of 646,000 cy and 512,000 cy of sand in 2001 and 2012,
respectively from these regional projects.
Locally, Tamarack beach is directly affected by the placement of sand from Agua Hedionda Lagoon
maintenance dredging activities. The program bypasses an average of 135,000 cy (during the period of
2001 to 2015) of sand from the flood shoal of the lagoon biennially. Dredged sand is placed at three beach
sites each year as follows: 1) north of the cold-water jetties within the study area, 2) south of the cold-water
jetties and 3) south of the warm water jetties. The direct placement of sand on this beach impacts width and
shape.
2.1 Carlsbad Blvd Bridge
The existing Carlsbad Blvd Bridge is a simple span cast in-place prestressed (CIP/PS) concrete box girder.
It is approximately 201-foot long, 82 feet wide. The superstructure consists of 8-foot deep twin box girders.
Carlsbad Blvd within the project limits is a 4-lane road, two lanes in each direction, separated by a raised
median within the bridge limits. The raised median ends at the bridge northern approach slab. Class II bike
lanes and sidewalk separated by concrete barriers are provided on both sides of the road. The barrier is
provided only within the limits of the bridge, and a guard rail is provided along the western sidewalk beyond
the northern bridge approach slab.
_Goal RYAN
Trail Connectivity to Tamarack State Beach
Item #7 Pfigag 4/01stErIP
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2.2 Clearance under Carlsbad Blvd Bridge
Vertical clearance under the bridge was a critical consideration, based on water surface elevations (WSEs)
in the lagoon. Based on the City of Carlsbad (City) Sea Level Rise Vulnerability Assessment report dated
December 2017, and the existing Carlsbad Boulevard bridge elevation, the following vertical clearance is
available under the existing bridge:
TABLE 1 - CLEARANCE UNDER CARLSBAD BLVD BRIDGE
Condition
Current Mean High-Water Line
WS Elevation
(ft) (a), Lagoon
4.44
Clearance Under Bridge (ft)
12.18
WS Elevation
(ft) (& Beach
-
Year 2050 Mean High-Water Line
(ft) 6.04 10.58 -
Year 2100 Mean High-Water Line
(ft) 11.04 5.58 -
Current Water Surface Elevation
(ft), (100-Year Storm) 6.90 9.72 11
Year 2050 Water Surface Elevation
(ft), (100-Year Storm) 8.50 8.12 13
Year 2100 Water Surface Elevation
(ft), (100-Year Storm) 13.50 3.12 18
Source: Chen Ryan Associates, June 2019.
As seen in the table above, clearance under the Carlsbad Blvd bridge is anticipated to decrease from 12.18
feet under Current Mean High-Water Line conditions to 5.58 feet under Year 2100 Mean High-Water Line
conditions.
2.3 Wave run-up study
The City of Carlsbad Sea Level Rise Vulnerability utilized the CoSMoS model which was developed as a
regional model and for planning purposes, therefore, site specific information was not accurate. Therefore,
a wave run-up study that focused on the project study area was developed.
The study evaluated existing and potential future coastal hazards (i.e. flooding and inundation) that may
impact the proposed trail connection. The study identified wave runup elevations to be approximately 2 feet
higher than WSE for the same return period. See Appendix A for wave run-up study.
ieirlEt1 &RYAN
Trail Connectivity to Tamarack State Beach
Item #7 PfigesOniscrt
Page
3.0 Feasibility Study Approach
This chapter describes the various analyses performed as part of the trail connectivity feasibility
evaluation.
3.1 Trail Connectivity to Tamarack State Beach
Multiple alternatives were considered to provide a trail connection in the vicinity of the Cold-Water Inlet.
The crossing can either be underneath the existing bridge or under the existing road, north of the bridge.
An overcrossing alternative was not considered due to significant visual impacts. The vertical clearance
underneath the bridge was a critical consideration, considering water surface elevations (WSEs) in the
lagoon.
The following alternatives were considered for a trail connection at the north side of the existing bridge:
1. Pedestrian Bridge (Beneath Exist Carlsbad Blvd Bridge)
A bridge supported on piles spanning beneath the existing Carlsbad Blvd Bridge, in front of the northern
abutment was considered. Based on Table 1, the maximum available clearance under the bridge for the
existing Mean High-Water condition is 12.18 ft. Considering the following requirements, a pedestrian
bridge requires a minimum of 12.5 ft vertical clearance. Therefore, this alternative is not feasible.
• 8"-0" Overhead Clearance
• 2'-6" Structure Depth
• 2'-0" Minimum Vertical Freeboard
2. Open Walkway
Walkway on a retaining wall beneath Carlsbad Blvd Bridge is a viable, cost effective option for this
alternative. However, this alternative is not preferable due to the following:
• Hydraulics Impact
o Scour
o Potential Back Water Effects
• Deep Foundations Required
• Closed During a Storm
iCklEtIARYAN
Trail Connectivity to Tamarack State Beach
Item #7 Pfigau titiOnE4
Page 17
Figure 2 Open Walkway
3. Walled Walkway
This alternative is similar to the Open Walkway, but it includes walls to work as barriers preventing
water from entering the walkway. This alternative is not preferable due to the following:
• Higher Hydraulics Impact than Open Walkway
o Scour
o Potential Back Water Effects
• Additional foundations required for the wall
• Closed During a Storm
Figure 3 ADA Crossing Under Exist Bridge
4. Tunnel
The design team also considered a standard tunnel underneath Carlsbad Blvd for a crossing at this
location. A tunnel typically requires a cover that is twice its diameter. To provide 9 ft overhead
clearance, which is the minimum clearance requested by the City for a closed crossing, the tunnel will
need to be about 30 ft below ground. Considering WSE discussed previously, a tunnel is not feasible
for this location.
5. Cut and Cover
Similar to the tunnel, this alternative would also be underneath Carlsbad Blvd however the trench
excavated is much shallower as the earth cover can be 12 inches minimum. Precast reinforced concrete
(PC/RC) box culvert is proposed for this alternative. The design team found this alternative to be the
most feasible option for a crossing at this location considering design limitations discussed previously.
Trail Connectivity to Tamarack State Beach
JeirlEti 2ORYAN Item #7 Ptge5 Uitt;fsitE0
Figure 4 ADA Crossing Under Exist Road
The results of the Wave Run-up study indicate higher water elevations as noted previously, which reduces
the available vertical clearance under the existing Carlsbad Blvd Bridge. Therefore, alternatives 2 and 3
were eliminated. As a result, the cut and cover alternative was selected as the preferred structure type for
this location.
4.0 Feasibility Study Results
4.1 Proposed Structure
The recommended alternative is a single cell precast reinforced concrete (PC/RC) box culvert crossing
under Carlsbad Blvd, north of the existing Carlsbad Blvd Bridge. The proposed structure would be built
using accelerated bridge construction (ABC) methods to minimize disruption to traffic and adjacent
residents.
The completed structure will be 92.5 feet long and 12 feet wide and 9 feet high, following the same skew
of the existing Carlsbad Blvd Bridge. Based on Caltrans Standard Plans, the proposed PC/ RC Box Culvert
will have 12-inch slabs and walls. The design assumes 2 feet of cover on top of the culvert. Two cast in
place (CIP) wing walls will be constructed on both ends of the box culvert. On the west end of the culvert,
at Tamarack State Beach, a 4 feet berm is proposed to keep water out of the structure. Additionally, a gate
can be added to both ends of the culvert, so it can be closed if flooded. The gate could also serve as a barrier
to prevent sand and dirt from entering the crossing. The box culvert is sloped at 1% from west to east to
drain into a proposed 18-inch storm drain on the eastern end of the crossing.
ADA Ramp at Trail
In order to provide complete ADA access from the eastern side of Carlsbad Blvd to Tamarack State Beach
on the west, an ADA ramp connecting the eastern sidewalk of Carlsbad Blvd to Agua Hedionda Trail would
be provided. The ramp would be about 255-foot long and 8-feet wide. Cast-in-place retaining walls are
proposed to frame the ramp with handrails on both sides of the ramp.
iGirlEtI2oRYAN
Trail Connectivity to Tamarack State Beach
Item #7 P Sges 8itrsrfsti,E0
Page 19
ADA Connection to Lower Sea Wall
On the western side of the box culvert crossing under Carlsbad Blvd, an ADA compliant concrete walkway
will connect to the existing parking lot. The parking lot will be reconfigured to provide a 4-foot wide ADA
path of travel along the western edge of the existing parking lot. The parking lot will be re-striped to
accommodate the proposed ADA path of travel, while maintaining the existing number of parking stalls
and minimum parking lot drive aisle widths.
The ADA path of travel will connect to an accessible 5-foot wide concrete ramp. This ramp will connect
to the modified Lower Sea Wall to provide a fully ADA compliant connection from the box culvert under
Carlsbad Boulevard to the Lower Sea Wall and proposed ADA Beach Access ramp at Tamarack Avenue.
The proposed modification to the Lower Sea Wall includes the removal of approximately 5-feet of the
existing "return wall" in order to create a connection location for the proposed ramp.
C onstructability
A specific construction staging and traffic control plan will be developed upon final design. Preliminary
information indicates the road will need to be closed during construction to excavate a trench and then it
can be covered with a temporary trench plate. Road closure will also be required to relocate existing utilities
that are in conflict with the proposed structure. These activities can be accomplished as night or weekend
work and it can be staged to minimize traffic impact.
Geotechnical
Based on preliminary review of existing conditions and the Geotechnical Investigation Report for the
Tamarack Coastal Improvements Project prepared by AECOM on March 2018, 2 feet of over-excavation
and recompaction may be required within the limits of the proposed box culvert. Since the proposed
structure is entirely in the bluffs, putting it in formational soil (Terrace Deposits), liquefaction would not
be an issue. Therefore, no ground improvements beyond the over- excavation and recompaction are
warranted.
Utilities
There are multiple existing utilities in the project area that will be affected by the proposed crossing.
Existing 4-inch HP Gas and electrical conduits for street lights can be relocated to be on top of the box
culvert. A portion of a 12-inch ACP Water Line will be impacted by the proposed crossing, so it will need
to be relocated underneath the proposed box culvert. Additionally, an existing 18-inch RCP Storm Drain
runs along the proposed structure, so it will need to be relocated and reconnected to an existing headwall
on the beach side. All this work will need to be coordinated and performed during road closures.
Aesthetics
For the box culvert crossing at Cold Water, it is proposed to extend the raised median on Carlsbad Blvd
north, so it crosses the box culvert, in order to provide a glass light well through the median. Lighting would
also be provided in the crossing. Additionally, new vegetation is proposed on the bluffs at Agua Hedionda
Trail to replace existing vegetation that would be impacted by the proposed crossing and ramp. Figure 5
and Figure 6 displays the conceptual design renderings for the proposed cut-cover tunnel.
4.2 Opinion of Probable Construction Costs
The project team developed a planning level opinion of probable construction costs for the trail
connection. The estimated cost, including design and CEQA clearance, was $3.0M for the trail
connection. A breakdown of costs can be found in Appendix B.
JeirIEN &RYAN
Trail Connectivity to Tamarack State Beach
Item #7 Pfigalc 9/10fsitbdP
Page I 10
4.3 CEQA Clearance
The project team completed an evaluation of environmental constraints to help transition into the next
phase of the project. The biggest constraint are the existing biological resources that would be
impacted by construction. However, these impacts can be mitigated. The Environmental Constraints
Analysis Table can be found in Appendix C.
iCirlE_t1 ARYAN
Trail Connectivity to Tamarack State Beach
Item #7 PAgesNitcrfstEcrt
—
/
KEY
0 PROPOSED PLANTING AREA; TYPICAL
Figure 5 Cold Water Cut-Cover Tunnel Rendering
\ ozoz 'iz Ainr \
4
„
+16.12 _
O EXISTING AGUA HEDIONDA TRAIL - REPAIR AS
NEEDED
• EXISTING RIP RAP
• LIMITS OF PROPOSED BOX CULVERT UNDER
PROPOSED ACCESS RAMP
-----------
Page Iii
ROAD
O PROPOSED SKYLIGHT OPENING IN MEDIAN
o PROPOSED 8'-0" INTEGRAL COLOR CONCRETE
ADA RAMP LSI JO 16 @Bed O PROPOSED RETAINING WALLS & HANDRAILS
o PROPOSED 18'' RCP STORM DRAIN
O PROPOSED CONCRETE"V" GUTTER
• EXISTING BRIDGE
O EXISTING STAIRCASE
CHEN *RYAN
Trail Connectivity to Tamarack State Beach
Feasibility Study
Page 112
Figure 6 Cold Water Cut-Cover Tunnel 3-D Simulation OZOZ gTz Ainf CHEN #RYAN
Trail Connectivity to Tamarack State Beach
Feasibility Study
PROPOSED ACCESSIBLE
PATH TO CARLSBAD
BOULEVARD
PROPOSED ACCESSIBLE
PATH TO COLD WATER
TUNNEL
PROPOSED PARKING PATH TAMARACK STATE BEACH
Page 113
SEQUOIA AVENUE
CARLSBAD BOULEVARD
ii ozoz 'Tz Ainr \\\\\
\ \\\
Figure 6.A Tamarack State Beach Parking Access LST 40 E6 aecl L# wall KEY
O DEMO 5'-0" OF EXISTING SEA WALL
O EXISTING CURB TO REMAIN
• RESTRIPE EXISTING PARKING STALLS
(1) EXISTING SEA WALL
PROPOSED 5'-0"CONCRETE WALKWAY
a PROPOSED ACCESSIBLE STRIPING
.4, EXISTING PARKING STRIPING TO REMAIN
CHEN 4fr RYAN
Trail Connectivity to Tamarack State Beach
Feasibility Study
Page 1 14
5.0 Conclusion
As described in this report, the City of Carlsbad Community Services — Parks & Recreation Department
commissioned a feasibility study for a connection between the North Shore Agua Hedionda Lagoon Trail
and Tamarack State Beach via pedestrian walkway, tunnel, or at grade crossing. After an engineering
evaluation and analysis of different alternatives that took into consideration factors such as terrain, sea level
rise, and constructability, the cut-cover tunnel was found to be the most feasible option to connect the North
Shore Agua Hedionda Lagoon Trail and Tamarack State Beach.
QiEn RYAN
Trail Connectivity to Tamarack State Beach
Item #7 F46etigi4iefulig7
Page 115
Appendix A
Final Wave Runup Study
Trail Connectivity to Tamarack State Beach
QTIEV RYAN
Item #7 PagebOY6furis7
Wave Run-up Study
City of Carlsbad ADA Beach and Lagoon Access Feasibility Study
Prepared for Chen-Ryan and Associates
3900 Fifth Avenue, Suite 310
San Diego, CA 92103
GHD I 9370 Sky Park Ct, Suite 140, San Diego, CA 92123, USA
11186682 1December14, 2018 (revised January 30, 2019)
July 21, 2020 Item #7 Page 96 of 157
Table of Contents
1. Introduction 1
2. Scope of Work 3
3. Existing Conditions & Coastal Setting 4
3.1 FEMA Mapping 7
3.1.1 Effective Flood Insurance Rate Map 7
3.1.2 Preliminary Flood Insurance Rate Map: 8
3.2 U.S. Geological Survey Coastal Storm Observing System (CoSMoS 3.0) 9
3.3 SANDAG Beach Profile Data 12
4, Oceanographic Data 15
4.1 Water Level 15
4.1.1 Tidal Datums 15
4.1.2 Tides 16
4.1.3 Sea Level Anomaly 16
4.1.4 Non-Tidal Residuals 17
4.1.5 Sea Level Rise 18
4.2 Wave Conditions 19
4.3 Beach Profile Analysis 20
5. Wave-Runup Results 21
6. Alternative Vulnerability Analysis 25
6.1 At-grade Walkway 25
6.2 Pedestrian Bridge 25
6.3 Cut and Cover structure 26
7 Conclusions 27
8. References 28
July 21, 2020 Item 17 Page 97 of 157
Figure Index
Figure 1. Pedestrian Bridge Concept (source: T.Y. Lin International) 2
Figure 2. Cut and Cover Concept (source: T.Y. Lin International) 2
Figure 3. Project Location Map 6
Figure 4. Project Map Showing Existing Coastal Structures and Topography (2011 SCC Lidar ft,
NAVD88) 6
Figure 5. FEMA NFIP Effective Flood Map for the Study Area 8
Figure 6. FEMA NFIP Preliminary Flood Map for the Study Area 9
Figure 7. CoSMoS Sea Level Rise Hazards in with 0.5m of Sea Level Rise (M&N 2015) 10
Figure 8. CoSMoS Sea Level Rise Hazards in with 2.0m of Sea Level Rise (M&N 2015) 11
Figure 9. Tamarack Seasonal Beach Profile Change at CB-0830 from Spring 1996 to Fall 2017 (CFC
2017) 13
Figure 10. Tamarack Mean Sea Level Beach Width Change from 1997 to Present (CFC Profile CB-
0830) 14
Figure 11. Water Level and Wave Data Locations Near the Project Site. 15
Figure 12. Non-Tidal Residual Hazard Curve for La Jolla 18
Figure 13. Significant Wave Height Return Periods for the Study Area 20
Figure 14. Seasonal CB-0830 Profiles from 2010 to 2012 (left) and Mean/Standard Deviation Profile
(right). 21
Figure 15. Wave Runup Hazard Curves for Project Site (ft NAVD88). 23
Figure 16. 10-yr Return Period Runup Elevations during Existing Conditions (2018) and Future
Condition (2068). 24
Figure 17. 100-yr Return Period Runup Elevations during Existing Conditions (2018) and Future
Condition (2068). 25
Table Index
Table 1. Tidal Datums from NOAA La Jolla Station 9410230. 16
Table 2. Astronomical Water Level Exceedance for La Jolla 16
Table 3. Sea Level Anomaly Exceedance for La Jolla 17
Table 4. Non-Tidal Residual Return Period for La Jolla. 17
Table 5. Sea Level Rise Trends for La Jolla 19
Table 6. Significant Wave Height Return Period for the Study Area (WIS 83105) 20
Table 7. Wave Runup Elevations for Project Site (ft, NAVD88) 23
July 21, 2020 Item #7 Page 98 of 157
I Introduction
Chen Ryan Associates, under contract to the City of Carlsbad (Carlsbad), is evaluating the
feasibility of connecting the North Shore Agua Hedionda Trail to Tamarack State Beach through an
ADA accessible pathway. Alternatives being considered to provide this connection are described
below:
1. At-grade connecting walkway — An at-grade crosswalk on Carlsbad Boulevard with ramps
and/or stairs to the beach. This concept has not be developed at the time of this study.
2. Pedestrian Bridge — An under-bridge pedestrian bridge / walkway under the Cold Water Inlet
Bridge, adjacent to the northern bridge abutment, as shown in Figure 1. A 9' vertical
clearance is desired for the walkway.
3. Cut and Cover walkway — A cut and cover walkway under Carlsbad Boulevard, as shown in
Figure 2. A 9' vertical clearance is desired for the walkway and a three-foot cover thickness is
assumed.
Aesthetics, functionality, environmental impact and coastal vulnerability are all factors being
considered in the evaluation of these potential options. GHD was contracted by Chen Ryan
Associates to evaluate existing and potential future coastal hazards (i.e. flooding and inundation)
that may impact the alternatives being considered in the feasibility study.
The approach of this analysis was developed using the Sea Level Rise Policy Guidance developed
by the California Coastal Commission (CCC) (August 2015) as updated by the recommendations of
the Adopted Science Update in November 2018 (California Coastal Commission, 2018).
July 21, 2020 Item #7 Page 99 of 157
Exist Carlsbad
Blvd Bridge
Walkway Under
the Bridge
Exist Carlsbad
Blvd Bridge
'OPOIPmeniminowi
l
rill1111111-1
_
Figure 1. Pedestrian Bridge Concept (source: T.Y. Lin International)
Figure 2. Cut and Cover Concept (source: T.Y. Lin International)
July 21, 2020
Item #7 Page 100 of 157
2. Scope of Work
GHD was retained by Chen Ryan Associated to prepare a Wave Run-up Study to support the
Carlsbad ADA Beach Access and Lagoon Feasibility Study Project for the City of Carlsbad. The
scope of work for this study is summarized below:
1. Review Existing Information - Available information for the study area was reviewed to form
an overview of the Project site from a coastal perspective. Data reviewed included the: City of
Carlsbad Sea Level Rise Vulnerability Study, Coastal Storm Observing System data
(CoSMoS 3.0), beach profile data (from SANDAG's regional beach monitoring program) and
FEMA data (effective and preliminary maps).
2. Prepare Wave Runup Study and Site-specific Vulnerability Assessment — The site's
vulnerability to coastal hazards (flooding and inundation) was analyzed in comparison to the
alternatives being considered with a focus on the ability of the proposed alternatives to
withstand extreme storm events in combination with tides and future predictions of sea level
rise. Determined existing and future wave runup elevations during frequently occurring and
extreme events (assumed 10-year and 100-year return period wave events within a 50-year
time horizon, respectively) to aide in the alternative evaluation. Once the limits of the coastal
hazards were established, vulnerabilities of the proposed alternatives were evaluated. The
analysis quantitatively described the frequency of coastal hazard exposure and the specific
alternative's sensitivity to these hazards.
3. Project Meetings and Management — GHD will attend two project team meetings; assumed
at the Project kick-off and Draft Wave Runup report phases.
July 21, 2020 Item #7 Page 101 of 157
3. Existing Conditions & Coastal Setting
The study area spans the shoreline from Tamarack Avenue to the northern Cold Water jetty. The
site consists of a coastal parking lot (i.e. Tamarack State Beach), which is fronted by a sandy beach
and backed by Carlsbad Boulevard (Figure 3). Carlsbad Boulevard is positioned on a coastal bluff
and is elevated from the coastal parking lot. Approximate elevations of key features in the study
area (relative to NAVD88, ft) are as follows:
• Tamarack State Beach Parking Lot: +12 to +15 (west to east)
• Carlsbad Boulevard (in vicinity of stairs): +26
• Cold Water bridge soffit: +17
• Tamarack back beach: +12
Jurisdictionally, the City owns and operates the roadway and California State Parks owns and
manages the parking lot and beach at Tamarack. The parking lot is currently subject to frequent
overtopping and State Parks has placed rip-rap on the seaward edge to help protect the lot during
these events. Wave overtopping of the parking lot was evident during a site visit on November 1,
2018 as overvvashed sand and marine debris were present on the western side of the lot (Photos 1
through 4). A vertical seawall begins immediately north of the parking lot, which spans about 3,500
feet to the north where it terminates in the vicinity of Pine Avenue (Figure 4).
The sandy beach at Tamarack is managed in that its width is controlled by regional and local beach
nourishment activities. Regionally, beach widths have been impacted by two large scale beach
nourishment efforts conducted by SANDAG in 2001 and 2012. These projects are known as the
Regional Beach Sand Project I and II, respectively. These projects placed about 2.1 million and 1.5
million cubic yards of sand on San Diego beaches. Placement of sand at two beaches upcoast from
Tamarack State Beach (i.e. North Carlsbad and Oceanside placement sites) have impacted beach
width and shape at this beach overtime. These upcoast placement sites received a total of 646,000
cy and 512,000 cy of sand in 2001 and 2012, respectively from these regional projects (CFC 2017).
Locally, the Tamarack beach is directly affected by the placement of sand from Agua Hedionda
Lagoon maintenance dredging activities. The program bypasses an average of 135,000 cy (during
the period of 2001 to 2015) of sand from the flood shoal of the lagoon annually (CFC 2017).
Dredged sand is placed at three beach sites each year as follows: 1) north of the cold water jetties
within the study area, 2) south of the cold water jetties and 3) south of the warm water jetties. The
direct placement of sand on this beach impacts width and shape.
July 21, 2020 Item #7 Page 102 of 157
MrraiifiJKI0,-t
:-_--.t_.i,.' ---;
, -,c,
.4. _ . Photo 2. Cold Water Jetty and bridge northern abutment. Photo 1. Tamarack State Beach Parking Lot.
.-I,' ft#MR‘r, - . - .. .
.
--
- . ,
, •i; — t
-1 - I2S
-if' - • i',
Photo 4. Rip rap shoreline protection fronting parking
_
/ .--..... . _ - , --- -
-- 7 7 ''''' --1 • _
Photo 3. Rip rap shoreline protection fronting parking lot.
..r.
lot. Evidence of recent wave runup into the parking lot.
July 21, 2020 Item #7 Page 103 of 157
[ 11,1kRiCKSIAlt
PA R)iln LOT
14
gl:RecIpps g
*\,
Exisling Mich Revetment
n •
SANDAG Beach Profile
Existing Sea Wars
Figure 3. Project Location Map
Figure 4. Existing Coastal Structures and Topography (2011 SCC Lidar ft, NAVD88)
July 21, 2020 Item #7 Page 104 of 157
3.1 FEMA Mapping
The Federal Emergency Management Administration (FEMA) maps national coastal hazards using
water level and wave data in order to derive their Flood Insurance Rate Maps (FIRM). Although
these maps do not include sea level rise, they do include wave induced water levels including
runup. These products were reviewed for the Project Site to understand FEMA mapped coastal
hazards in the study area.
FEMA is in the process of updating the FIRM for southern California; thus, the effective and
preliminary maps were reviewed. Differences between the effective and preliminary FIRM products
suggest that the base flood elevation (BFE) in the study area will increase from 11 feet (NAVD88) to
20 ft (NAVD88) and will change zone designations from AE and VE. More details on the findings of
these map reviews are below.
3.1.1 Effective Flood Insurance Rate Map
The FEMA Effective FIRM for the Project site (Panel 06073C0763G revised 5/16/2012) was
reviewed. According to the Effective FIRM, the Project site is located in the vicinity of FEMA zones:
Zone VE (EL 11) and Zone AE (EL 11), as shown in Figure 5. These zones are defined below:
Zone VE (EL 11) — Coastal High Hazard Area with a base flood elevation (BFE) of 11 feet
(NAVD88). The zone includes anticipated wave heights at or exceeding 3 feet; however, allows
construction when the structure is designed to accommodate anticipated wave forces and when the
minimum building foundations are above the BFE.
Zone AE (EL 11) — Areas subject to inundation by the 1-percent-annual-chance (or 100-year) flood
event determined by hydraulic methods. The zone has a BFE of 11 feet (NAVD88).
July 21, 2020 Item #7 Page 105 of 157
CHINQUAPIN AVE
AGUA HEDIONDA
LAGOON
ZONE A
ZONE X
ZONE AE
(EL 11)
Figure 5. FEMA NFIP Effective Flood Map for the Study Area
(Modified from: FEMA.gov)
3.1.2 Preliminary Flood Insurance Rate Map:
The FEMA Preliminary FIRM for the Project site (Panel 06073C0763H issued 2/3/2017) was
reviewed. According to the Preliminary FIRM, the Project site is located in Zone VE (EL 20) and
Zone AE (EL 8), as shown in Figure 6. These zones are defined below:
Zone VE (EL 20) — Coastal High Hazard Area with a base flood elevation (BEE) of 20 feet
(NAVD88). The zone includes anticipated wave heights at or exceeding 3 feet; however, allows
construction when the structure is designed to accommodate anticipated wave forces and when the
minimum building foundations are above the BEE.
Zone AE (EL 8) — Areas subject to inundation by the 1-percent-annual-chance (or 100-year) flood
event determined by detailed methods. The zone has a BEE of 8 feet (NAVD88).
July 21, 2020 Item #7 Page 106 of 157
,..--
,L.4-1...-47' mi,
— V'7 ,-. -.-- V 7
.7. .."
Figure 6. FEMA NFIP Preliminary Flood Map for the Study Area
(Modified from: FEMA.gov)
1•571.111
3.2 U.S. Geological Survey Coastal Storm Observing System
(CoSMoS 3.0)
Carlsbad's exposure to future rates of sea level rise was outlined in the City of Carlsbad Sea Level
Rise Vulnerability Assessment (Moffatt & Nichol & Revell Coastal, 2015). To assess future
vulnerability at the community scale, preliminary results from the CoSMoS 3.0 model were coupled
with future predictions of sea level rise. CoSMoS was developed for hindcast studies, operational
applications and future climate scenarios to provide emergency responders and coastal planners
with storm-hazards information that can be used to increase public safety, mitigate physical
damages, and more effectively manage and allocate resources within complex coastal settings
(Barnard et al., 2018). The modeling approach that has been developed by the U.S. Geological
Survey (USGS) to allow detailed predictions of coastal flooding due to both future sea level rise and
storms integrated with long-term coastal evolution (i.e., beach changes and cliff/bluff retreat) over
large geographic areas (100s of kilometers).
The 100-yr return period coastal hazards for year 2050 (0.5m or 1.65 ft of sea level rise) is shown in
Figure 7. Coastal hazards in the study area with 2.0m of sea level rise is shown in Figure 8.
CoSMoS results differ from those proposed by FEMA. The intent of CoSMoS was not to identify
coastal hazards at the parcel scale but instead to identify hazards and vulnerabilities over large
geographic regions. CoSMoS was also developed to predict potential future hazards resulting from
sea level rise while FEMA maps coastal hazards based on an analysis of existing data.
July 21, 2020 Item #7 Page 107 of 157
WWI
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0 175 .350 7001301
ASSETS
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POTENTIALLY VULNERABLE
PARCELS -ZONING
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Biul11.130.anl Zone 10.5m)
Flood limard Zone (051n1
Figure 7. CoSMoS Sea Level Rise Hazards with 0.5m of Sea Level Rise (M&N 2015)
July 21, 2020 Item #7 Page 108 of 157
WWI e 175 Bet: 700 ,e-et EXHIBIT B3
Ar.
es
—
TA pLA N NINB AREA
4 POTENTIALLY VULNERABLE
PARCELS-ZONING
Oat Pane1y Pe,depual
I Open Space
CocrenericallOpen Space
SEA-LEVEL RISE HAZARDS
— — — - Inurdatiun Hum, Zone (Man)
1111,1Raccard Zane e2.Die1
Flair] Hazard Zone Cleat,
ASSETS
L:feguaccl towers
Acccs Peens
Yr Sewer Parnp11.11ne
— —
- RoAs
—
- 0
F —Al-- 0 c4. 1
1 t.
Figure 8. CoSMoS Sea Level Rise Hazards with 2.0m of Sea Level Rise (M&N 2015)
July 21, 2020 Item #7 Page 109 of 157
3.3 SANDAG Beach Profile Data
In 1996, SANDAG initiated the Regional Shoreline Monitoring Program (Monitoring Program), which
measures the changes in beach width over time, documents the performance of sand
replenishment projects, and helps to improve the design and effectiveness of beach fills. The
Monitoring Program provided data for the design of the 2001 and 2012 Regional Beach Sand
Projects (RBSP) and helped guide the selection of candidate beach sites. Although the monitoring
requirements imposed as permit conditions of the 2001 RBSP ended in 2006, SANDAG has
continued a modified monitoring program (SANDAG, 2017).
Profile CB-0830 of the Monitoring Program is located within the Project site at the north end of the
Tamarack State Beach Parking Lot. The location of the transect is shown in Figure 4. Profiles at this
location have been measured seasonally (spring/fall) from 1996 to 2017 and are shown in Figure 9.
Profile CB-0830 is an accretional beach profile developed in response to regional and local
nourishment programs. Sediment transport within the littoral cell influences beach profiles on a
regional scale as sediment is moved along the coast in response to the wave climate. The most
recent nourishment used sediment courser than native sand that resulted in a steepening of the
upper shoreface relative to historic conditions. Figure 10 shows the time history of the mean sea
level contour since 1996. The data indicate that the growth of the profile started in 2012, reaching
the maximum beach width in 2014. An accretional beach profile, with seasonal fluctuations in profile
width, has occurred since 1997.
July 21, 2020 Item #7 Page 110 of 157
Coastal Frontiers Profile CB-0830
-100 /50 300 400
Range (ft from lransecl origin)
700 600 SOO
10
-10
-15
-5
1996 Saran
— 1996 Fall
---- 1997 Spnag
— 1907 Fall
- 1998 Span
— 1990 Fall
— 1999 Swig
192,9 Fall
2000 Spans;
2000 Fall
—2001 Spong
— 2001 Fall
—2002 Sarni;
--2002 Fall
—2003 Sppog
---2003 Fall
2004 Sprng
2004 Fall
— 2005 Sprng
--- 2005 Fall
2006 Sprag
2006 Fall
407 Sprng
2907 Fall
2000 Sprtng
2000 Fall
2000 Spnog
2609 Fail
2010 Simag
2010 Fall
2011 Spnng
- 2014 Fall
-- 2012 SpAng.
— 2012 Fall
—2013 601109
—2013 Fali
—2014 Saran
— 2014 Fall
— 2015 Sprog
—Z315 Fall
— 2016 Spivs)
—2046 Fall
—2017 Spring
—2017 Fan
Figure 9. Tamarack Seasonal Beach Profile Change at CB-0830 from Spring 1996 to Fall
2017 (CFC 2017)
July 21, 2020 Item #7 Page 111 of 157
Coastal Frontiers Profile CB-0830
1H-1
220 r 1
MSLi
200 I - !
180
E
— 8, I 100
80
60 -
:2 1201-
I
40 -
2007 1997 2000 2002 2005
1
2010 2012 2015 2017
Figure 10. Tamarack Mean Sea Level Beach Width Change from 1997 to Present (CFC Profile
CB-0830).
July 21, 2020 Item #7 Page 112 of 157
CO-OPs - Station ID: 9410230
Oceanographic Data
The approach for this Wave Run-up Study is to analyze current and potential future site conditions
relative to wave run-up. These elements are discussed in this section.
4.1 Water Level
Water level data for the Project Site were obtained from National Oceanic and Atmospheric
Administration (NOAA) La Jolla gauge (Station 9410230). The station is located at (32° 52 N, 1170
15.4' W) and was established in 1924 (with an updated installation in 1988). The tide gauge location
is shown in Figure 11. Water levels from this site are analyzed in this section.
Figure 11. Water Level and Wave Data Locations near the Project Site.
4.1.1 Tidal Datums
Tidal datums in La Jolla are applicable to the San Diego region open-ocean coastline. The tidal
datums are summarized in Table 1. Elevations in this report are described relative to the NAVD88
tidal datum.
July 21, 2020 Item #7 Page 113 of 157
Table 1. Tidal Datums from NOAA La Jolla Station 9410230.
Datum Abbreviation Elevation
(ft NAVD88)
Highest Astronomical Tide HAT 6.95
Mean Higher-High Water MHHW 5.13
Mean High Water MHW 4.41
Mean Tide Level MTL 2.56
Mean Sea Level MSL 2.54
Mean Diurnal Tide Level DTL 2.47
Mean Low Water MLW 0.71
Mean Lower-Low Water MLLW -0.19
Lowest Astronomical Tide LAT -2.07
North American Vertical
1988
Datum of NAVD88 0.00
Station Datum STND -4.56
4.1.2 Tides
Tides in Carlsbad are semidiurnal in nature, which refers to two highs and two lows occurring per
day. Astronomical water levels were isolated from the tidal record by regressing known tidal
frequencies onto the tidal record. Astronomical water levels for the Project site are shown in
Table 2.
Table 2. Astronomical Water Level Exceedance for La Jolla.
Exceedance
CYO
Water Level
(ft)
1 3.40
2 3.09
5 2.58
10 2.06
25 1.08
4.1.3 Sea Level Anomaly
A mean sea level anomaly reveals the regional extent of anomalous water levels in the coastal
ocean, which can indicate unusual water temperatures, salinities, average monthly winds,
atmospheric pressures, and/or coastal currents. The sea level anomaly occurs over periods of
months and demonstrates the interconnectedness of the ocean with atmospheric systems. Sea
level anomalies are typical along the U.S. Pacific Coast with climatic events such as the El Nino
Southern Oscillation (ENSO) (NOAA, 2013). The sea level anomaly exceedance curve for La Jolla
is shown in Table 3.
July 21, 2020 Item #7 Page 114 of 157
Table 3. Sea Level Anomaly Exceedance for La Jolla.
Exceedance Water Level
(0/0) (ft)
0A9
2 0.40
5 0.28
10 0.21
25 0.10
4.1.4 Non-Tidal Residuals
Non-tidal residuals (NTR) consist of components of the recorded water level not linked to
astronomical tide or seasonal water levels. NTRs include water level responses to regional effects
such as storm surge and changes in atmospheric pressure and typically occur on the order of days.
Storm surge is an abnormal rise of water over and above the predicted astronomical tide, typically
generated by a storm, and is generally the result of wind-induced set up along a shoreline.
Atmospheric pressure changes result in water column expansion or retraction due to low and high-
pressure systems, respectively.
Return period NTR events within the La Jolla tidal record were identified through a statistical
analysis of the tide gauge record. Results are summarized in Table 4 and shown in Figure 12. The
data indicate the 50- and 100-year NTR events are 1.18 feet and 1.29 feet, respectively.
Table 4. Non-Tidal Residual Return Period for La Jolla.
Return Period
(yr)
Water Level
(ft)
5 0.88
10 0.96
25 1.08
50 1.18
100 1.29
July 21, 2020 Item #7 Page 115 of 157
2.2
0.8
0.6
• Data (R = 0.982)
Best-Fit Curve
— — 95% Confidence Interval
I.
VVeibull (k = 0.75) [A= 0.02 B = 025 A = 0.43)
La Jolla, CA - Station ID: 9410230
1 10 100 1000
Return Period (yr)
Figure 12. Non-Tidal Residual Hazard Curve for La Jolla.
4.1.5 Sea Level Rise
Sea level rise trends were taken from California Coastal Commission Sea Level Rise Policy
Guidance, Table G-11 for the La Jolla tide gauge. The authors state that the table is adapted from
the 2018 California Ocean Protection Council Sea Level Rise Guidance (Ocean Protection Council
(OPC), 2018) to present only the three scenarios OPC recommends evaluating. While the OPC
tables include low emissions scenarios, only high emissions scenarios, which represent RCP 8.5,
are included in this study because global greenhouse gas emissions are currently tracking along
this trajectory. The H++ projection is a single "worst-case" scenario and does not have an
associated likelihood of occurrence. Projections are relative to a baseline year of 2000 (or more
specifically, the average relative sea level over 1991-2009). Although all three SLR scenarios were
assessed in the analysis, the Medium-High Risk Aversion projection is specifically discussed below.
July 21, 2020 Item #7 Page 116 of 157
Table 5. Sea Level Rise Trends for La Jolla
Projected Sea Level Rise (in feet): La Jolla
Probabilistic Projections (in feet) H++ Scenario
(based on Kopp et al. (2014)) (Sweet et al., 2017)
Year Low Risk
Aversion
Medium-High Risk
Aversion
Extreme Risk
Aversion
Limit of 'likely range" 1-in-200 chance Single scenario
(-17% probability SLR
exceeds...)
(0.5% probability SLR
exceeds...) (no associated probability)
2000 0.0 0.0 0.0
2030 0.6 0.9 1.1
2040 0.9 1.3 1.8
2050 1.2 2.0 2.8
2060 1.6 2.7 3.9
2068 1.9 3.4 4.9
2070 2.0 3.6 5.2
2080 2.5 4.6 6.7
2090 3.0 5.7 8.3
2100 3.6 7.1 10.2
2110 3.7 7.5 12.0
2120 4.3 8.8 14.3
2130 4.9 10.2 16.6
2140 5.4 11.7 19.2
2150 6.1 13.3 22.0
(Adapted from: California Coastal Commission Sea Level Rise Policy Guidance, Table G-11)
4.2 Wave Conditions
Water level data for the Project Site were obtained from United States Army Corps of Engineers
(USACE) Wave Information Studies (WIS) Station 83105. The wave station location is shown in
Figure 11. The objective of the WIS is to provide high-quality coastal wave hindcast model
estimates, wave analyses products and decision tools nationwide (U.S. Army Corps of Engineers,
2010). Wave estimates were hindcast using high quality wind fields, ice fields where appropriate
and the latest wave modeling technology. To satisfy the Corps requirement for risk-based designs,
long records of continuous wave climatology data are required. Hindcast datasets provide hourly
wave information for locations every few miles along the coast.
Return period significant wave height events at the WIS station were identified through a statistical
analysis of the tide gauge record. Results are summarized in Table 6 and shown in Figure 13. The
data indicate the 50- and 100-year return period wave events are 19.8 feet and 21.3 feet,
respectively. Note that a 10 year return period event has a 10% chance of occurring in any given
year and that a 100-year event has a 1% chance of occurrence in a year.
July 21, 2020 Item #7 Page 117 of 157
30
a)
45 25
co
c—o o 20
co
co 15
a) 2
10
Data (R = 0.970)
Best-Fit Curve
— 95% Confidence Interval
.••••
it! • • la.
0*.
001
WeiuII(1.Y2)[A=O.7O B = 3.14 A = 1.25]
35
Table 6. Significant Wave Height Return Period for the Study Area (WIS 83105)
Return Period
(yr)
Sig. Wave Height
(ft)
5 14.5
10 16.1
25 18.2
50 19.8
100 21.3
Wave Information Study (WIS) - Station ID: 83105
1 10 100 1000
Return Period (yr)
Figure 13. Significant Wave Height Return Periods for the Study Area
4.3 Beach Profile Analysis
Beach profiles were used to characterize local beach conditions at the Project site. SANDAG
profiles (CB-0830) from Spring 2010 to Fall 2012 were selected and averaged to form a
representative profile. Although there are more recent profiles, the most recent profiles seem
strongly influenced by RBSP ll project that have steepened the shoreface and do not appear
representative of natural beach conditions. Since wave runup results are influenced by beach slope
(i.e. steeper beach slope results in higher runup elevation), choosing a different representative
beach profile would change the results.
July 21, 2020 Item #7 Page 118 of 157
Elevation (ft NAVD88) 10
0
-10 -
•15
Profile Averaging (2010 - 2012)
-2010 Spring
-2010 Fall
2011 Spring 15 -
-2011 Fall
2012 Spring
2012 Fall
--Mean
— — Std Dev
▪ —F
15 -
10
Elevation (ft NAVD88) 0
-15
-100 0 100 200 300 400 500 600 700 -100 0 100 200 300 400 500 600 700
Range (ft from transect origin) Range (ft from transect origin)
Figure 14. Seasonal CB-0830 Profiles from 2010 to 2012 (left) and Mean/Standard Deviation
Profile (right).
Wave-Runup Results
Probabilistic hazard analysis provides a means to incorporate natural uncertainties, model
uncertainties and errors into the hazard assessment. Probabilistic hazard analysis was extended to
oceanographic problems [see Geist & Parsons (2006) & Geist & Lynett (2014)] by adapting a long-
standing probabilistic method for determining ground motion exceedance caused by earthquake
known as probabilistic seismic hazard analysis (Cornell, 1968).
Probabilistic hazard analysis is founded on the idea of separating input variable return periods (e.g.
storm surge, significant wave height) from hazard recurrence periods. Using a Monte Carlo
methodology, variables constrained by the prescribed probability density functions can be input to a
given set of governing equations to generate realizations which define the hazard recurrence space.
This methodology is ideal where the governing equations may be well known, but the independent
variables of the input as well as the resisting design components may not be completely known.
The process repeats hundreds or thousands of times to generate a statistical understanding of
design parameters (e.g. still water level, runup elevation) which contains the uncertainty of the input
parameters. Once the statistical parameters space is defined, the maximum envelope of all of these
realizations is estimated which represents the best estimate of the design parameter hazard. This
curve is what is known as the hazard curve.
July 21, 2020 Item #7 Page 119 of 157
For instance, for a given set of significant wave heights and water levels, it is possible that each
parameter set can have the same recurrence period but that the individual components can have
vastly difference individual recurrences. When coupled with a set of governing equations, the
difference in the input parameters can result in a wide array of possible solutions which define the
parameter space by recurrence period. Therefore, by defining the maximum envelope or hazard
curve for a given set of significant wave heights and water levels, it is possible to directly estimate
which solution defines the upper bound of the recurrence hazard. This upper bound is what is
defined as the hazard curve.
The run-up elevations (R„„a ) for the Project site were estimated using a Monte Carlo methodology
where the water level is a summation of individual components.
RTotal = 1ldatum + ?lade nseasonal rINTR 11SLR + R2
where 77 'datum is the data reference, ?lade is the tidal elevation, n , seasonal is the seasonal water level
elevation, n , NTR is the nontidal residual elevation, ns,,R is the sea level rise elevation at a given time
period and R2 is the run-up point reached or exceeded by only 2% of all waves.
Wave constituents are input into the Stockdon, Holman, Howd, & Sallenger (2006) empirical run-up
equation. This equation is commonly used to estimate run-up on sandy beaches along the western
U.S. shorelines. The equation is defined as follows:
, 11104(0.563fli + 0.004)11/2
R2 = 1.1(0.35 f3f(HoL0)112 + 2
Where, Ho is offshore significant wave height, Lo is offshore significant wavelength and flf is beach
slope. The R2 run-up level is a common metric for quantifying the maximum elevation inundated
during a storm event.
Run-up elevations return periods for the Project site are given in Table 7 and shown in Figure 15.
The 10- and 100-year return period events for the existing condition are 16.0 feet and 19.5 feet,
respectively. The 10- and 100-year return period events increase to 19.4 feet and 22.9 feet,
respectively under the year 2068 Medium-High Risk Aversion sea level rise scenario. Elevations are
shown overlaid on an aerial image for 2018 and 2068 in Figure 16 and Figure 17, respectively.
These results are comparable to the preliminary FIRM map elevations developed by FEMA. The
migration of mean sea level landward with the various projections of sea level rise are also shown in
these figures.
July 21, 2020 Item #7 Page 120 of 157
Table 7. Wave Runup Elevations for Project Site (ft, NAVD88).
Return
Period
(yr)
2018 Low Risk
Aversion
2068
Medium-
High Risk
Aversion
Extreme
Risk
Aversion,
H++
10 16.0 17.9 19.4 20.9
100 19.5 21.4 22.9 24.4
City of Carlsbad Wave Uprush Study
28
26
03 24 0
E 22
03
0. 03
S 20
18
16
14
2018
2068 (Low Risk Aversion)
2068 (Moderate-High Risk Aversion)
2068 (Extreme Risk Aversion)
10 100 1000
Return Period (yr)
Figure 15. Wave Runup Hazard Curves for Project Site (ft NAVD88).
July 21, 2020 Item #7 Page 121 of 157
10-YR Wave Runup:
2018 Mean Sea Level
— 2068 Mean Sea Level (Low)
2068 Mean Sea Level (Moderate-High)
— 2068 Mean Sea Level (Extreme)
- • - 2018 Wave Runup
• • - 2068 Wave Runup (Low)
2068 Wave Runup (Moderate-High)
- - - 2068 Wave Runup (Extreme)
Figure 16. 10-yr Return Period Runup Elevations during Existing Conditions (2018) and
Future Condition (2068).
July 21, 2020 Item #7 Page 122 of 157
.1‘
A
?).,4
100-YR Wave Runup:
— 2018 Mean Sea Level
— 2068 Mean Sea Level (Low)
2068 Mean Sea Level (Moderate-High)
— 2068 Mean Sea Level (Extreme)
- - 2018 Wave Runup
• - 2068 Wave Runup (Low)
2068 Wave Runup (Moderate-High)
- - - 2068 Wave Runup (Extreme)
Figure 17. 100-yr Return Period Runup Elevations during Existing Conditions (2018) and
Future Condition (2068).
6. Alternative Vulnerability Analysis
6.1 At-grade Walkway
Although the at-grade crosswalk on Carlsbad Boulevard concept has not been fully developed, the
elevation of the crossing on the roadway would be outside the reach of coastal hazards in the
existing and year 2068 condition. However, ramps and/or stairs down to the beach would likely be
within the limits of wave runup during extreme events. Thus, design of the ramps and/or stairs to the
beach should consider the coastal hazards described in this report.
6.2 Pedestrian Bridge
Specific elevations of this concept have yet to be developed. However, based on the vertical
walkway clearance desired and the bridge's soffit elevation, it is likely that the under-bridge
pedestrian bridge / walkway would be subject to frequent inundation (daily wetting and drying)
associated with tides in the existing and year 2068 condition. The walkway would also be subject to
flooding as waves commonly propagate between the cold water jetties in the existing condition.
Design of this concept should consider frequent wetting and drying and wave forces acting on the
structure.
July 21, 2020 Item #7 Page 123 of 157
6.3 Cut and Cover Structure
The vulnerability of the cut and cover walkway under Carlsbad Boulevard is at its connection to the
Tamarack State Beach parking lot. Given the walkway's design that includes a 9' vertical clearance
and three-foot cover thickness, the walkway enters the parking lot at an elevation of approximately
+14'. Assuming this elevation, the walkway would be vulnerable to flooding during less than a 10-
year return period wave event in the existing condition (without sea level rise). Under any sea level
rise scenario (Low or Medium-High Risk Aversion) by year 2068, the frequency and severity of
walkway flooding would increase.
Flooding events would expose the walkway to salt water, sand and debris during peak periods of
the tidal cycle and wave event. Therefore, exposure of the walkway to flooding would be relatively
short in duration (few hours during a day) and episodic in nature.
Adapting the walkway to accommodate impacts associated with flooding may include the following
design concepts:
• Incorporate drainage features within the walkway that allow water to discharge or percolate.
• Protect the walkway's western terminus from flood waters entering with a controlling structure,
such as a cutoff wall or dike.
• Improve shoreline protection at Tamarack State Beach parking lot to prohibit flooding. Concepts
to prohibit flooding would require an engineered revetment of seawall on the seaward edge of
the lot. Since the parking lot is owned by State Parks, coordination with the agency would be
needed to progress this option.
July 21, 2020 Item #7 Page 124 of 157
7. Conclusions
An analysis of existing and future coastal hazards was conducted to support Chen Ryan Associates
in the preparation of a feasibility study for this Project. The analysis included maximum wave run-up
during storm conditions in combination with potential future sea level rise (SLR). The approach of
the analysis was developed in general conformance with the California Coastal Commission (CCC)
SLR Policy guidance including recommendations within the Science Update released November
2018.
The 10- and 100-year return period wave runup elevations in the existing condition are 16.0 feet
and 19.5 feet, respectively. The 100-year runup result is comparable to that shown in the NFIP
preliminary map elevations developed by FEMA. The 10- and 100-year return period events
increase to 19.4 feet and 22.9 feet, respectively under the year 2068 Medium-High Risk Aversion
sea level rise scenario.
Based on a review of available information for the alternatives being considered in this feasibility
study, we offer the below coastal hazard vulnerability findings and recommendations:
At-grade Walkway: This concept would not be exposed to coastal hazards in the existing or
year 2068 condition. However, ramps and/or stairs down to the beach would likely be within
the limits of wave runup during extreme events. Thus, design of the ramps and/or stairs to the
beach should consider the coastal hazards described in this report.
• Pedestrian Bridge: Although elevations of the walkway deck and underdeck were not available
at the time of this analysis, the structure would likely be subject to frequent inundation (daily
wetting and drying) associated with tides in the existing and year 2068 condition. The walkway
would also be subject to flooding and wave forces acting on the structure as ocean waves
commonly propagate between the cold water jetties. A more detailed analysis would be
needed to understand the extent of wave impacts on this structure. It is recommended that the
design of this concept consider frequent wetting and drying and wave forces acting on the
structure.
• Cut and Cover Walkway: The western terminus of the walkway would be vulnerable to flooding
during a 100-year return period wave event without sea level rise. The walkway would be
vulnerable to flooding during anything greater than a 10-year return period wave event with
predictions for sea level rise by year 2068. This assumes that the walkway's western terminus
elevation is +14' NAVD88. Incorporation of drainage controls within the walkway, installation of
a water controlling structure fronting the terminus of the walkway, and protection of the parking
lot from flooding with a coastal structure (such as a seawall) were presented as potential
design options to lessen coastal vulnerabilities and accommodate sea level rise for this option.
July 21, 2020 Item #7 Page 125 of 157
8. References
Barnard, P., Erikson, L., Foxgrover, A. C., Limber, P. W., O'Neill, A. C., & Vitousek, S. (2018).
Coastal Storm Modeling System (CoSMoS) for Southern California, v3.0, Phase 2. U.S. Geological
Survey. Retrieved from https://doi.org/10.5066/F7T15104
California Coastal Commission. (2018). California Coastal Commission Sea Level Rise Policy
Guidance. State Of California—Natural Resources Agency.
Cornell, C. A. (1968). Engineering seismic risk analysis. Bulletin of the Seismological Society of
America, 58(5), 1583-1606.
Coastal Frontiers Corporation. 2017. Shoreline Monitoring Program Annual Report. Prepared for
SANDAG.
Geist, E. L., & Lynett, P. J. (2014). Source processes for the probabilistic assessment of tsunami
hazards. Oceanography, 27(2), 86-93. https://doi.org/10.5670/oceanog.2014.43
Geist, E. L., & Parsons, T. (2006). Probabilistic Analysis of Tsunami Hazards. Natural Hazards,
37(3), 277-314. https://doi.org/10.1007/s11069-005-4646-z
Kopp, R. E., Horton, R. M., Little, C. M., Mitrovica, J. X., Oppenheimer, M., Rasmussen, D. J., ...
Tebaldi, C. (2014). Probabilistic 21st and 22nd century sea-level projections at a global network of
tide-gauge sites. Earth's Future, 2(8), 383-406. https://doi.org/10.1002/2014EF000239
Moffatt & Nichol & Revell Coastal. (2015). City of Carlsbad Sea Level Rise Vulnerability
Assessment. City of Carlsbad.
Ocean Protection Council (OPC). (2018). State of California Sea-Level Rise Guidance: 2018
Update. State of California. Retrieved from http://vvvvw.opc.ca.gov/
SANDAG. (2017). Regional Shoreline Monitoring Program. SANDAG. Retrieved from
https://www.sandag.org/
Stockdon, H. F., Holman, R. A., Howd, P. A., & Sallenger, A. H. (2006). Empirical parameterization
of setup, swash, and runup. Coastal Engineering, 53, 573-588.
Sweet, W. V., Kopp, R. E., Weaver, C. P., Obeysekera, J., Horton, R. M., Thieler, E. R., & Zervas,
C. (2017). Global and Regional Sea Level Rise Scenarios for the United States. NASA Goddard
Space Flight Center, United States National Oceanic and Atmospheric Administration. Retrieved
from https://ntrs.nasa.gov/
U.S. Army Corps of Engineers. (2010). Wave Information Studies Project Documentation. Coastal
and Hydraulics Laboratory Engineer Research and Development Center. Retrieved from
http://wis.usace.army.mil/
July 21, 2020 Item #7 Page 126 of 157
Page 116
Appendix B
Cost Estimate and Structures Estimate
Trail Connectivity to Tamarack State Beach
Qui RYAN Item #7 PfigtEitg/YefulAS7
INTERNATIONAL CARLSBAD FEASIBILITY 04/25/2019
CONCEPTUAL COST ESTIMATE
Description Measure Quantity Price Total I Subtotals
Site Civil
Clearing and Grubbing LS 1 $7,740.00 $7,740
Roadway Excavation CY 227 $70.00 $15,890
Embankment CY 46 $120.00 $5,520
Remove Concrete (Curb and Gutter) LF 78 $10.00 $780
Remove Concrete (Sidewalk) SF 464 $10.00 $4,640
Remove Asphalt Concrete Pavement CY 83 $30.00 $2,480
Remove Concrete (Curb) CY 2 $290.00 $644
Class II Aggregate Base CY 82 $50.00 $4,100
Hot Mix Asphalt (TYPE A) TN 112 $120.00 $13,392
Minor Concrete (Sidewalk) CY 17 $700.00 $12,030
Minor Concrete (6" Curb & Gutter) CY 3 $550.00 $1,589
Minor Concrete (6" Curb) CY 5 $800.00 $4,296
Install 18" RCP Storm Drain LF 130 $200.00 $26,000
Install 48" RCP Storm Drain LF 135 $500.00 $67,500
Type A-6 Cleanout EA 1 $7,000.00 $7,000
Type B-1 Inlet EA 1 $6,200.00 $6,200
18" D-4 Headwall EA 1 $6,000.00 $6,000
18" Automatic Drainage Gate EA 2 $4,500.00 $9,000
Catch Basin - Type G EA 1 $3,900.00 $3,900
Concrete Pipe Collar EA 2 $4,000.00 $8,000
Remove RCP Storm Drain LF 104 $200.00 $20,800
Remove Inlet EA 1 $2,000.00 $2,000
Remove Drainage Structure EA 1 $4,000.00 $4,000
Relocate Street Light EA 2 $4,000.00 $8,000
Midwest Guardrail System LF 80 $80.00 $6,400
Fence LF 101 $30.00 $3,030
SWPPP LS 1 $10,000.00 $10,000
Construction Area Traffic Control LS 1 $50,000.00 $50,000
Civil Subtotal $310,931
Utilities
Relocate 6" PVC Sewer Force Main LS $65,000.00 $65,000
Relocate 12" CMLC Water LS $100,000.00 $100,000
Relocate 4" HP Gas LS $65,000.00 $65,000
Utility Subtotal $230,000 I
July 21, 2020 Item #7 Page 128 of 157 of 2
INTERNATIONAL
CARLSBAD FEASIBILITY 04/25/2019
CONCEPTUAL COST ESTIMATE
Description Measure Quantity Price Total I Subtotals
ADA Ramp
Clearing and Grubbing
Roadway Excavation
Embankment
Minor Concrete (Sidewalk)
Concrete Ditch
Cast in Place - Retaining Wall
Handrail
LS
CY
CY
CY
SF
SF
LF
1
139
290
157
252
1,724
610
$23,712.92
$70.00
$120.00
$700.00
$24.00
$150.00
$90.00
$23,713
$9,730
$34,800
$109,900
$6,048
$258,600
$54,900
Structures
Precast Box Culvert 1 LS 1 1 I $500,000.00
Ramp Subtotal ' $497,691
$500,000
Lighting
Lighting LS 1 $100,000.00
Structures Subtotal $500,000
$100,000
Landscape
Relocate Interpretive Signage
Revegetation Areas
Temporary Irrigation
Irrigation trenching/wiring (Asphalt removal and rep
EA
SF
SF
Allowance
1
3,500
3,500
1
$175.00
$2.50
$1.50
$2,500.00
Structures Subtotal $100,000
$175
$8,750
$5,250
$2,500
Utility Subtotal $16,675
Construction Total
30% Contingency
$1,655,297
$496,589
Construction Grand Total $2,151,886
DESIGN COST
Environmental and PE.
Design - 30% Package
Design - 60% and Permits
Design - 90%, Final, Bid Support
%
%
%
%
7
4
5
5
CCE
CCE
CCE
CCE
$151,000.00
$87,000.00
$108,000.00
$108,000.00
Design Subtotal $454,000
Construction Management (20%) $430,377
COST TOTAL $3,036,300
July 21, 2020 Item #7 Page 129 of 157 of 2
INTERNATIONAL Carlsbad ADA Beach Access Feasibility Study D. Kasawdish
Preliminary Structures Cost Estimate 2/20/2019
1 .ADA Beach Access at Cold Water
Structure Type: Cut and Cover- RC/ PC Box Culvert N.)
0 \.) 0
Ramp Length= 92.5 LF
6 ft PC Box Length per Oldcastle
Cost/ Box= $ 10,000 Based on estimate provided by Oldcastle and input from TYLI CM
No. Boxes= 16
Structure Cost= $ 160,000
Add'n costs= $ 200,000 Excavation, backfill, wing walls plus non standard box for skylight
Total= $ 360,000
Add 25% Contingency
Structure Cost= $ 360,000
For Budget, Use $ 400,000 Cost already included in the total estimate under Structures LSI 40 OET aed
Page 117
Appendix C
Environmental Constraints Table
Trail Connectivity to Tamarack State Beach
JCOUI ARYAN Item #7 PfigtsitWVeSfM7
NJ 0 LSI 10 ZS' aSed Carlsbad Trail Connectivity to Tamarack State Beach Feasibility Study — Environmental Constraints Analysis Table
The preferred alternative for the Trail Connectivity to Tamarack State Beach project involves constructing a cut and cover tunnel beneath Carlsbad Boulevard and constructing ADA compliant ramps on both sides of the
tunnel. The tunnel would be approximately 93-feet and the ramps would haves maximum incline of 7.9 percent. The tunnel/ramp system would connect to the existing North Shore Agua Hedionda Lagoon Trail and provide
connectivity from the east side of Carlsbad Boulevard to the beach.
Issue Area Existing Conditions/Assumptions Trail Connectivity to Tamarack State Beach Constraints Summary
Aesthetics • Existing structures on the west side of Carlsbad Boulevard
include a jetty armored with rock slope protection, and a parking
lot with the open beach just west of these structures. On the east
side of Carlsbad Boulevard, existing trails along with a small
undisturbed hillside are below residential homes, which line the
perimeter of the lagoon.
•
•
•
Construction of the tunnel/ramp system would be
primarily in a previously developed area or would
coincide with existing trails,
Extension of the trail system, including signage,
would be consistent with existing design.
Landscaping of native vegetation would be
•
•
•
Aesthetic impacts are not anticipated, as the design of this
alternative would be similar to the existing developed areas
adjacent to this site.
The portion of the ramp that would connect to eastward trails
would be designed similarly to the existing trail.
This option would not interfere with views of the coastline. • No designated scenic resources are located in the area. established adjacent to the proposed
improvements,
• The tunnel would not be highly visible to users as it is situated
under an existing developed roadway/structure. Air Quality • It is assumed that no operational sources are associated with this
Option, therefore only construction impacts are evaluated.
• Potential impacts due to construction would be
temporary. Standard construction equipment would
• Air quality emissions associated with the proposed project
include emissions from construction, including trenching under • No sensitive receptors are located in the vicinity of the proposed
project.
be used. the roadway. However, operations associated with construction
would minimize emissions through standard construction
measures, storm water pollution prevention plan measures,
and best management practices.
• Construction would be temporary; applicable measures would
be implemented as necessary to minimize emissions. Biological Resources • The majority of vegetation to the west and east of Carlsbad
Boulevard is planted vegetation and/or bare ground or beach,
The'proposed tunnel would be connected to the existing State
Parks parking lot west of Carlsbad Boulevard. East of Carlsbad
Boulevard, the proposed ramp would impact the existing hillside,
which mostly consists of sparse vegetation and existing trails. It
should be noted that planted rare plant species may be present in
the vegetation to the east of Carlsbad Boulevard; however, this
habitat is not expected to be contiguous with existing habitat to
the east within the larger Agua Hedionda Lagoon complex and a
low number of species are expected in this footprint.
•
•
•
Equipment staging during construction would most
likely occur in existing developed or unvegetated
areas (e.g., sewer lift station parking lot east of
Carlsbad Boulevard, trails, State Parks parking lot),
Impacts to vegetation may occur with installation of
the ramp on the east side of Carlsbad Boulevard
(e.g., vegetation removal),
Revegetation of bare ground and the establishment
of formal trails would occur after ground-disturbing
activities in the proposed project footprint,
• The proposed improvements have the potential to impact
vegetation near the site. However, the majority of the proposed
project footprint is sparsely vegetated or consists of planted
vegetation that has successfully established at the site, which
indicates that plant establishment would most likely be
successful post-construction. To the extent practicable, the
design of the ramp/tunnel system uses existing infrastructure
and trails, which would minimize impacts to vegetation. Best
management practices would be implemented to ensure plant
establishment adjacent to the ramp on the east side of
Carlsbad Boulevard.
• Wildlife species in the proposed project site are not anticipated
due to the disturbed footprint underneath and adjacent to
Carlsbad Boulevard. However, habitat near the proposed project
has potential eastward connection with Agua Hedionda Lagoon.
• The proposed project footprint does not function as a major
terrestrial wildlife movement corridor. No impacts are
anticipated to wildlife movement/corridors with implementation
of this option. North of the project site is coastal bluff, to the west is the Pacific
Ocean, and to the south is the lagoon inlet. • Measures would be implemented to avoid and/or minimize
potential impacts to rare plant and/or wildlife species if found •
•
If feasible, project implementation would avoid the aquatic
environment and potential jurisdictional resources to the south,
This area is not located within the City of Carlsbad's Habitat
(e.g., plant salvage, clearance surveys for birds, and
vegetation removal outside of the breeding season, if
applicable). Management Plan (HMP) and is not designated as a significant
wildlife corridor (City of Carlsbad 2004). • To the extent practicable, aquatic and jurisdictional resources
would be avoided during construction of the proposed
improvements.
• Temporary impacts to vegetation may occur; however, the
proposed project site would be planted east of Carlsbad
1
Alternative Summary
NJ
.!"
NJ
LSI Jo EEL aed Carlsbad Trail Connectivity to Tamarack State Beach Feasibility Study — Environmental Constraints Analysis Table
Issue Area Existing ConditionslAssumptions Trail Connectivity to Tamarack State Beach Constraints Summary
Boulevard, and vegetation would be reestablished in this area
post-construction.
Cultural/Tribal
Cultural Resources
• A previous records search was conducted in the vicinity of the
proposed project for the Carlsbad Boulevard and Tamarack
Avenue Improvement Project in 2017 and encompassed the
proposed tunnel/ramp system footprint (AECOM 2018). The
previous records search indicated 20 studies have been
conducted, four cultural resources were previously recorded, and
one cultural resource was identified during a pedestrian survey,
all within a 0.5 mile vicinity of the proposed project After
consulting with the Native American Heritage Council, it was
determined that no Native American places or sites were on file
in the vicinity of the proposed project site. Two prehistoric sites
were recorded within 1,500 feet of the proposed project, one of
which consisted of a short-term camp with shell midden and
cobble base artifacts, while the other site had primarily shell and
lithic scatter (AECOM 2018). The proposed project is not
anticipated to impact these sites as they are located outside of
the direct project footprint.
• The proposed project would be located on
previously undisturbed areas east of and under
Carlsbad Boulevard. Potential for impacts could
occur if a previously unknown resource was
discovered during ground-disturbing activities.
• Standard surveys, analysis, and mitigation measures (e.g.,
consulting a qualified archaeologist and a Native American
representative, if applicable) would be implemented prior to
and during construction, as required.
Geotechnical/Geology • There are no active faults identified through Carlsbad, and the
California Geologic Survey does not include Carlsbad on list of
cities affected by the Alquist-Priolo Earthquake Fault Zones,
However, Carlsbad is in a seismically active region and is subject
to ground-shaking during an earthquake.
• The majority of the proposed project would be
constructed on a previously developed site and
have generally the same footprint as the existing
trail system. However, potential impacts could occur
associated with the soil removal and tunneling
• Although loss of topsoil from project implementation is not
anticipated to be substantial, measures would be adopted in
order to minimize the potential impacts to topsoil with
implementation (e.g., erosion control and revegetation/planting
plan, City review of site grading plan to ensure compliance with
•
•
Geotechnical stability analyses were performed, indicating that
the coastal bluffs in the project area currently have adequate
factors of safety against deep instability and would not be located
on an unstable geologic unit or on expansive soils (AECOM
2016).
As stated in the General Plan, the city of Carlsbad is located in
the coastal portion of the Peninsular Ranges Geomorphic
Province; a region characterized by northwest-trending structural
blocks and intervening fault zones (City of Carlsbad 2015a). The
proposed project areas consist of fill material and terrace
deposits where the base of the bluffs is characterized by the
Santiago Formation and relatively resistant sandstone forms the
lower portion of the bluff (AECOM 2016). Pleistocene terrace
deposits compose the upper portion of the bluff, above an
elevation of approximately 8 to 12 feet above mean sea level
required to construct the tunnel,
•
•
•
code requirements).
The proposed project would adhere to all applicable building
and seismic codes and regulations, and would therefore not
expose people or structures to potential substantial adverse
effects, including risk of loss, injury, or death due to severe
ground shaking.
Due to the nature of the site as described under existing
conditions, impacts related to increased slope instability,
landsides, or other adverse seismic-induced geologic hazards
are not anticipated.
Impacts to unique geologic or physical features are not
anticipated with construction of the proposed improvements.
(AECOM 2016). . Greenhouse Gas • It is assumed that no operational sources are associated with the • Standard construction equipment would be used • The proposed project is expected to be in compliance with the
Emissions
•
proposed improvements, therefore only construction impacts are
evaluated,
The City of Carlsbad adopted a Climate Action Plan (CAP) that
outlines actions that the city will undertake to achieve its
proportional share of the state Greenhouse gas (GHG) emissions
reductions. The CAP is a plan for the reduction of GE-IC
emissions in accordance with California Environmental Quality
and standard emissions controls would be
implemented.
Carlsbad CAP and would not emit at or above the CAP
screening threshold of 900 metric tons of CO2 equivalent, as
outlined in the CAP Consistency Checklist Additionally, the
project's incremental contribution to a cumulative GHG
emissions effect would not be considered cumulatively
considerable, because it would comply with the requirements
of the CAP.
Act (CEQA) Guidelines Section 15183.5. Pursuant to CEQA
2
LSI 10 VET aed Carlsbad Trail Connectivity to Tamarack State Beach Feasibility Study — Environmental Constraints Analysis Table
Issue Area Existing Conditions/Assumptions Trail Connectivity to Tamarack State Beach Constraints Summary
Guidelines Sections 15064(h)(3), 15130(d), and 15183(b), a
project's incremental contribution to a cumulative GHG emissions
effect may be determined not to be cumulatively considerable if it
complies with the requirements of the CAP.
Land Use •
•
The proposed project is surrounded by residential development
to the northeast, the inlet of Ague Hedionda to the south, and the
Pacific Ocean to the west,
The proposed project is in the coastal zone and subject to
regulations per the California Coastal Act.
• The proposed project would comply with applicable
land use policies and guidelines,
• The proposed project would conform to applicable land use
policies and guidelines (e.g. Coastal Act) and appropriate
resource agencies would be involved during the permitting
process (i.e. California Coastal Commission, California State
Parks).
• The proposed project footprint extends to an existing California
State Parks parking lot and is located at Tamarack State Beach,
which is under State Parks jurisdiction.
• The proposed tunnel/ramp system would establish trail
connectivity from the North Shore Agua Hedionda Lagoon Trail
to Tamarack State Beach. The proposed project would not only
enhance east to west connectivity but would also establish
ADA compliant ramps at this access location. The proposed
improvements would be consistent with existing land use and
recreation for the area. Noise •
•
•
•
It is assumed that no operational sources are associated with this
option, therefore only construction impacts are evaluated,
The closest noise sensitive receptors to the proposed project are
residential structures 50 feet from the nearest construction
boundary.
Given the open space and recreational nature of the proposed
project site, the public using the beach could be considered a
sensitive noise receptor during construction,
Carlsbad Boulevard may be closed temporarily to complete
construction of the proposed project It is anticipated this work
would be completed at night to avoid peak commute and
recreation times during the day.
• Noise impacts associated with construction would
be temporary, and standard construction equipment
would be used,
•
•
During construction, noise minimization measures would be
implemented and the project would follow the local noise
ordinance as detailed in Chapter 8.48, Section 8.48.010, Noise
of the City of Carlsbad Municipal Code to the extent possible. If
construction work is performed at night to avoid peak commute
and recreation times, an exception from the City of Carlsbad
would be obtained to complete this work per Section 4.48.020
of the municipal code.
While the public using the beach during construction hours
may experience higher noise levels anticipated with
construction, other portions of the beach where temporary
construction noise could be avoided will remain open for use.
Residents adjacent to the proposed project area may
experience construction noise at night; however, this work
would be temporary and limited to short durations. Sound
attenuation structures may be implemented to reduce noise as
feasible.
Recreation •
•
The North Shore Agua Hedionda Lagoon Trail is located east of
the proposed project footprint,
There are multiple existing access points along this portion of
coastline, none of which are currently ADA compliant,
Recreational opportunities exist on both sides of Carlsbad
Boulevard without connecting access, currently, due to the
• Construction would temporarily interrupt use at the
western end of the existing trail system within the
lagoon (e.g. the existing steep dirt path on the east
side of Carlsbad Boulevard may be closed
temporarily during construction). The remainder of
the trail system east of the proposed project site
• Recreation and public access would be temporarily interrupted
during construction. Portions of the State Parks parking lot may
be temporarily closed to stage equipment; however, a portion
of the parking lot would be left open for recreational users. If
feasible, proposed project work would be conducted outside of
the busy summer season.
roadway,
•
would remain open during construction for use.
Currently, there is no east-to-west access across
• Post-construction, recreation and access would be enhanced
via ADA compliant ramps with access beneath Carlsbad
Carlsbad Boulevard; the only option is to travel a
substantial distance north of the site to cross at the
crosswalk at the intersection of Tamarack Avenue
and Carlsbad Boulevard. A portion of the State
Boulevard, connecting trails and the beach, as well as
establishing direct coastal pedestrian access from residential
areas located east along the perimeter of the lagoon.
Parks parking lot may be temporarily unavailable
during construction including the existing staircase
and the end of the trail system to the east would be
3
Carlsbad Trail Connectivity to Tamarack State Beach Feasibility Study — Environmental Constraints Analysis Table
Issue Area Existing Conditions/Assumptions Trail Connectivity to Tamarack State Beach Constraints Summary
temporarily closed, but other access points along
the beach and parking lots would remain open.
Sea Level Rise • The proposed improvements are subject to influences from sea • To the extent practicable, structures have been • Due to the vulnerability of the connection point between the
/Storm Damage
Vulnerability
•
level rise and increased wave action from more extreme storm
events. The proposed project's vulnerability to coastal hazards,
such as flooding and inundation, were evaluated assuming 10-
year and 100-year return period wave events over 50 years
(GHD 2019). The point of vulnerability would be at the connection
between the tunnel and the existing State Parks parking lot,
which would be constructed at an elevation of approximately +14'
NAVD88, making the western part of the structure vulnerable
during:
1) a 100-year return period wave event without sea level rise,
and;
designed to provide resilience to coastal hazards,
such as flooding and inundation, with the
consideration of sea level rise in 50 years.
tunneVramp system and the existing parking lot, infrastructure
may be subject to flooding events and/or impacts from large
storm events most likely during the winter months. To minimize
potential impacts from sea level rise, the City would monitor
conditions of the access point and would use gates to close the
tunnel if necessary under extreme events when flooding may
occur. Closing the tunnel would minimize risk to the public
using this access route. Closures would be short in duration
and episodic, as flooding events would impact the tunnel
during peak periods of the tidal cycle and wave event(s) (GHD
2019).
• 2) anything greater than a 10-year return period wave event with
predictions for sea level rise by year 2068 (GHD 2019).
Transportation/Traffic •
•
It is assumed that no operational sources are associated with this
option, therefore only construction impacts are evaluated,
Increased traffic to the site due to improved access is assumed to
be minimal and most likely by existing users or residents using
this improved route to access the beach, because the proposed
project would create an ADA compliant ramp and safer/more
direct pedestrian access.
• Traffic may be temporarily interrupted during
construction,
• Measures would be implemented during construction to avoid
and/or minimize temporary traffic impacts (e.g., timing of
project work, traffic control plan). Temporary closures to
Carlsbad Boulevard are not anticipated to increase traffic, as
they are designed to avoid the busiest times of the day.
• Carlsbad Boulevard may be closed temporarily to complete
construction of the proposed project. It is anticipated this work
would be completed at night to avoid peak commute and
recreation times during the day.
References
AECOM
2016 Geotechnical Investigations Carlsbad Boulevard and Tamarack Avenue Pedestrian Improvements Project.
2018 Cultural Resources Phase I Survey Report for the Carlsbad Boulevard and Tamarack Avenue Improvement Project.
City of Carlsbad
2004 Habitat Management Plan for the Natural Communities in the City of Carlsbad. Available at: http://www.carlsbadca.00v/civicax/filebank/blobdload.asox?BloblD=27193. Accessed August 2016.
2015a General Plan. Available at http://www.carlsbadca.gov/services/depts/olannina/general.aso. Accessed July 2019. •
(3)
2015b General Plan and Climate Action Plan Final Environmental Impact Report. Available at: htto://www.carlsbadca.aov/civicax/filebank/blobdload.asox?BloblD=28464. Accessed August 2016.
GHD LSI JO SEI aped 2019 Wave Run-up Study, City of Carlsbad ADA Beach and Lagoon Access Feasibility Study.
4
CITY COUNCIL
MA, HALL - MAYOR
KEITH BLACKBURN - MAYOR PRO-TEM
PRIYA EIHAT-PATEL - COUNCIL MEMBER
CORI SCHUMACHER - COUNCIL MEMBER
PAZ GOMEZ
DEPUTY CITY MANAGER.
PUBLIC WARES
GARY BARBERIO
DEPUTY CITY MANAGER,
COMMUNITY SERVICES
VICINITY MAP
NOT TO SCALE
CITY OF „OCEANSIDE
xi WAY ,
PACIFIC
OCEAN
ULcos
VISTA
PROJECT
SITE
LOCATION MAP
NOT TO SCALE
Sheet 1 oh'
CHEN *RYAN Carlsbad 1,236.1.2
4(1 City of
• SCHMIDT
DESIGN
0.00 GROUP
CONCEPTUAL PLANS FOR
ADA BEACH ACCESS AND TRAIL CONNECTIVITY FEASIBILITY STUDY
CITY OF CARLSBAD, CALIFORNIA
SHEET I TITLE SHEET
SHEET 2 KEY MAP
SHEET 3 PINE AVENUE SHEET 4 PHOTO SIMULATES. PINE AVENUE
SHEETS TAMARACK AVENUE
SHEETS PHOTO SIMULATION 'TAMARACK AVENUE
SHEET 7 TAMARACK PARKING ACCESS SHEET COLD WATER TUNNEL
SHEET 5 PHOTO SIMULATION - COLD WATER TUNNEL
SHEET ID DESIGN CHARACTER
SHEET 11 PLANT MATERIAL D lUaWlpelly ADA BEACH & TRAIL CONNECTIVITY
f, Feasibility Study
Carlsbad, California
SDG Project Number: 18-506
Date: January 23, 2020
NTS
0 PINE AVENUE TAMARACK STATE BEACH
CARLSBAD BLVD.
ADA BEACH 86 TRAIL CONNECTIVITY
f, Feasibility Study
E Carlsbad, California
SDG Project Number: 18-1°6
Date: January 23, 2020
(Cityof
CHEN *RYAN Carlsbad
Obe, SCHMIDT
111.,• DESIGN
•Gif* GROUP
0 Annoc
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Sheet 2 0E11
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oCOLD WATER TUNNEL
4
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----.. •
-
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KEY
O PROPOSED 8'-0"RAMP WITH
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O 2% MAX. LANDINGS; TYPICAL
O PROPOSED PLANTING AREA; TYPICAL
O START OF ELEVATED ACCESSIBLE PATH ON
STRUCTURAL COLUMNS
o END OF ELEVATED ACCESSIBLE PATH
ON STRUCTURAL COLUMNS. PATH
CONTINUES AT GRADE TO THE SOUTH
O EXISTING ADA ACCESSIBLE PARKING
O EXISTING BLUFF &TRAILS TO REMAIN;
REPAIR AS NEEDED
o EXISTING STORM DRAIN
CO PROPOSED LOCATION FOR RELOCATED
SHOWER
• EXISTING SIDEWALK
11) EXISTING RIP RAP
O EXISTING RESTROOM
• EXISTING SHOWER TO BE RELOCATED
10
+40.90
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OS. SCHMIDT
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SCALE 1. 20,0' CltY of 0 10 20 40
Sheet 3 ofii
ADA BEACH & TRAIL CONNECTIVITY
Feasibility Study
Carlsbad, California
SDG Project Number: 18.906 '
Date, January 23, 2020
ADA BEACH Et TRAI L CONNECTIVITY
Feasibility Study E' Carlsbad, California
SDG Project Number 18.106
Date: January 23, 2020
Photo Simulation
Pine Avenue Access
1.60 SCHMIDT
6, DESIGN
000 GROUP
CHEN *RYAN Carlsbad nag: 1 IIV 2.1,
SCXMIDIMS.1.0,1
Sheet 4 of II
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Date: January 23, 2020
000 SCHMIDT
• DESIGN
WOO GROUP
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Sheet 5 of 11
Tamarack Beach Access 0 10 20 40
SCALE I^ - 20 0 City of
CHEN *RYAN Carlsbad
ADA BEACH & TRAIL CONNECTIVITY
4:6 Feasibility Study
Carlsbad, California
SDG Project Number: 18-106
2 12Ts---.
PROPOSED ACCESS RAMP TAMARACK STATE BEACH
KEY
o PROPOSED 8'-0"WIDE CONCRETE RAMP
WITH HANDRAILING
e PROPOSED 8' ELEVATED WOOD RAMP ON
STRUCTURAL COLUMNS
O PROPOSED STAIRCASE
O PROPOSED PLANTING AREA; TYPICAL
O PROPOSED RETAINING WALL
CARLSBAD BLVD.
EXISTING TURF TO REMAIN
+33.95 FS
---- —
EXISTING BLUFF TO REMAIN
424 -
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PROPOSED ACCESSIBLE PATH TO PARKING
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O EXISTING PAVING
• EXISTING LIFEGUARD TOWER
ip EXISTING AC SIDEWALK
-111111111111,
EXISTING CONDITIONS
" ADA BEACH & TRAIL CONNECTIVITY
Feasibility Study
Carlsbad, California
SDG Project Number: 18-106
Date: January 23, 2020
Photo Simulation
Tamarack Beach Access (City of
CHEN *RYAN Carlsbad
440 SCHMIDT
4' • DESIGN 440 GROUP
41,33.02
SCR/AM-MS.1.M
Sheet 6 of 11
KEY
o DEMO 5'-0" OF EXISTING SEA WALL
O EXISTING CURB TO REMAIN
o RESTRIPE EXISTING PARKING STALLS
o EXISTING SEA WALL
O PROPOSED 5'-0" CONCRETE WALKWAY
O PROPOSED ACCESSIBLE STRIPING
O EXISTING PARKING STRIPING TO REMAIN
o EXISTING SAND TO BE REMOVED AT NEW WALKWAY
0 la 20 40
SCALE 20,0"
+16.50 PROPOSED ACCESSIBLE
PATH TO CARLSBAD
BOULEVARD
PROPOSED ACCESSIBLE
PATH TO COLD WATER
TUNNEL
PROPOSED PARKING PATH TAMARACK STATE BEACH
17,..SCQUOIA AVENO \
_
CARLSBAD BOULEVARD
7
3
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ADA BEACH ge, TRAIL CONNECTIVITY
!; Feasibility Study
Carlsbad, California
SDG Project Number: 18-106
Date: Janua,y 23, 2020
City of
CHEN *RYAN Carlsbad
00410 SCHMIDT
4*, * DESIGN
*MO GROUP
138 2191,2 34119
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Sheet 7 ofii
Tamarack Parking Access
KEY
0 PROPOSED PLANTING AREA; TYPICAL
o EXISTING AGUA HEDIONDA TRAIL - REPAIR AS
NEEDED
O EXISTING RIP RAP
O LIMITS OF PROPOSED BOX CULVERT UNDER
ROAD
o PROPOSED SKYLIGHT OPENING IN MEDIAN
O PROPOSED 8'-0" INTEGRAL COLOR CONCRETE
ADA RAMP
O PROPOSED RETAINING WALLS & HANDRAILS
II 0 PROPOSED 18" RCP STORM DRAIN
O PROPOSED CONCRETE "Vn GUTTER
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Sheet 8 oh,
ADA BEACH & TRAI L CONNECTIVITY
FT Feasibility Study
Carlsbad, California
SOD Project Number: 18-1o6
Date: January 23, 2000
City of
CHEN *RYAN Carlsbad
ADA BEACH gt TRAI L CONNECTIVITY
I Feasibility Study
Carlsbad, California
SDG Project Number: A-1°6
Date: id0U2ry 23, 2020
Photo Simulation
Cold Water Tunnel Access City of
CHEN *RYAN Carlsbad
fro * 0.0
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ADA BEACH & TRAIL CONNECTIVITY
Feasibility Study
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SDG Project Number 18-1o6
Date: January 23, 2020
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Exhibit 2
CITY COUNCIL
Staff Report
CA Review
Meeting Date: July 24, 2018
To: Mayor and City Council
From: Kevin Crawford, City Manager
Staff Contact: Craig Williams, Senior Engineer
craig.vvilliams@carlsbadca.gov or 760-826-9523
Subject: Professional Services Agreement with Chen Ryan Associates, Inc. for the
preparation of a feasibility study in an amount not to exceed $199,836
for the Trail Connectivity to Tamarack State Beach and the Americans
with Disabilities Act (ADA) Beach Access Study Projects.
Recommended Action
Adopt a Resolution authorizing the execution of a Professional Services Agreement with Chen
Ryan Associates, Inc. for the preparation of a feasibility study in an amount not to exceed
$199,836 for the Trail Connectivity to Tamarack State Beach, Project No. 4063, and the ADA
Beach Access Study, Project No. 6065 (Projects).
Executive Summary
Staff recommends that the City Council authorize the execution of a Professional Services
Agreement (Agreement) for the preparation of a feasibility study (Study) for the Projects. The
Study will examine the feasibility of constructing ADA accessible ramps from Carlsbad
Boulevard down to the beach, as well as the feasibility of a trail connection from the Agua
Hedionda North Shore Hubbs Trail along Agua Hedionda Lagoon to the beach. Carlsbad
Municipal Code Section 3.28.060 requires that the City Council shall be the awarding authority
for procurement of professional services when the value exceeds $100,000. This Agreement is
subject to this requirement.
Discussion
One of the Project sites is located along Carlsbad Boulevard and the coastline, from Pine
Avenue to the Cold Water Inlet Bridge (Bridge) south of Tamarack Avenue. The consultant will
study the feasibility of constructing ADA accessible pedestrian walkways and ramps at one or
more locations along this segment, connecting the walkway along Carlsbad Boulevard down to
the seawall and beach. In addition, the consultant will study the feasibility of constructing a
trail connection from the Agua Hedionda North Shore Hubbs Trail (Trail) along the north side of
the Agua Hedionda Lagoon under or across Carlsbad Boulevard to the beach. The study will
evaluate the feasibility of both undercrossing and at-grade solutions. Aesthetics, functionality,
environmental impact and cost will all be factors in the consideration of the potential options.
On Dec. 28, 2017, the city issued a request for Statements of Qualifications (SOU) for
professional services to prepare the study for the Projects. On Feb. 1, 2018, three 500's were
received and a selection committee composed of city staff reviewed and evaluated the
July 21, 2020 Item #7 Page 147 of 157
submittals. The SOQ's were evaluated on the quality of each consultant's experience,
performance of similar work, ability to provide the services, project approach and cost.
Based on a review of the SOCt's and the negotiation of an acceptable scope of work and fee, in
accordance with the city's Purchasing Policies and Procedures Manual and Carlsbad Municipal
Code Section 3,28.060(A), staff recommends executing the Agreement with Chen Ryan
Associates, Inc. in an amount not to exceed 6199,836.
Fiscal Analysis
The Study will examine the feasibility of both Projects and will therefore be utilizing the General
Capital Construction funds previously appropriated for Project Nos. 4063 and 6065. The
available funds and estimated costs for the Study are shown in the following table:
TRAIL CONNECTIVITY TO TAMARACK STATE BEACH AND THE ADA BEACH ACCESS STUDY
PROJECT NOS. 4063 AND 6065 _
Appropriation— General Capital Construction Fund No. 40531 ,Current $200,000
Current Expenditures/Encumbrances $47,824
i TOTAL AVAILABLE FUNDS, PROJECT NO. 4063 $152,176
Current Appropriation -- General Capital Construction Fund No. 80551 ._ $75,000
Current Expenditures/Encumbrances
1
$0
. TOTAL AVAILABLE FUNDS, PROJECT NO. 6065 $75,000
TOTAL AVAILABLE FUNDS, PROJECT NOS. 4063 + 6065 227,176
Professional Services Agreement — Chen Ryan Associates, Inc. _ $199,836
$20,000 Project Management —City Staff (estimated)
ESTIMATED PROJECT COST $219,836
REMAINING BALANCE AFTER PROJECT NOS. 4063 AND 6065 $7,340
, ADDITIONAL APPROPRIATION NEEDED $0
Next Steps
Staff will work with Chen Ryan Associates, Inc. to prepare the Study over the next 12 months,
Staff will return to the City Council for approval of the Study, which will then be used to develop
specific Project requests for inclusion in the city's Capital improvement Program.
Environmental Evaluation (CEW%)
Approving an agreement for the preparation of a feasibility study for possible future actions,
which the city has not yet approved, is statutorily exempt from the California Environmental
Quality Act (CEOA) under CEQA Guidelines 15262 (Feasibility and Planning Studies)..
Public Notification
This item was noticed in accordance with the Ralph M. Brown act and was available for public
viewing and review at least 72 hours prior to the scheduled meeting date.
Exhibits
1. City Council Resolution.
2. Location Map.
July 21, 2020 Item #7 Page 148 of 157
EXHIBIT 1
RESOLUTION NO. 2018-144
A RESOLUTION OF THE CITY COUNCIL OF • THE CITY OF CARLSBAD,
CALIFORNIA, AUTHORIZING THE EXECUTION OF A PROFESSIONAL SERVICES
AGREEMENT WITH CHEN RYAN ASSOCIATES, INC. FOR THE PREPARATION
OF A FEASIBILITY STUDY IN AN AMOUNT NOT TO EXCEED $199,836 FOR THE
TRAIL CONNECTIVITY TO TAMARACK STATE BEACH, PROJECT NO. 4063, AND
THE ADA BEACH ACCESS STUDY, PROJECT NO. 6065.
WHEREAS, the City Council of the City of Carlsbad, California has determined that it is necessary
and in the public interest to prepare the Feasibility Study for the Trail Connectivity to Tamarack State
Beach, Project No. 4063, and the ADA Beach Access Study, Project No. 6065 (Projects); and
WHEREAS, under Carlsbad Municipal Code Section 3.28.060, the Public Works Department
solicited Statements of Qualifications (SOQs) from consultants for the preparation of a Feasibility Study
for the Project and received a total of three submittals from qualified consulting firms; and
WHEREAS, subsequent to a review of the SOQs, Chen Ryan Associates, Inc. has been identified
as the most qualified consultant for the preparation of the Feasibility Study for the Projects; and
WHEREAS, city staff and Chen Ryan Associates, Inc. have negotiated the scope of work and fee
not to exceed $199,836 to provide the professional services; and
WHEREAS, funding for the Projects is available in the General Capital Construction Funds.
NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Carlsbad, California, as
follows:
1. That the above recitations are true and correct.
2. That the mayor is authorized and directed to execute the Professional Services
Agreement with Chen Ryan Associates, Inc. in an amount not to exceed $199,836 to
prepare the Feasibility Study for the Trail Connectivity to Tamarack State Beach,
Project No. 4063, and the ADA Beach Access Study, Project No. 6065, which is attached
hereto as Attachment A.
July 21, 2020 Item #7 Page 149 of 157
EXHIBIT 1
PASSED, APPROVED AND ADOPTED at a Regular Meeting of the City Council of the City of
Carlsbad on the 24th day of July, 2018, by the following vote, to wit:
AYES: M. Hall, K. Blackburn, M. Schumacher, C. Schumacher, M. Packard.
NOES: None.
ABSENT: None.
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MATT ALL, /yor
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BARBA• GLESO , City Clerk
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July 21, 2020 Item #7 Page 150 of 157
ADA Beach Access Project #6065
Trail Connectivity to Tamarack State Beach Project #4063
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Exhibit 2b
EXHIBIT 3
January 20, 2020
City of Carlsbad ADA Beach & Lagoon Access Feasibility Study — Conceptual Plans
• Responses to Comments Received from CA Coastal Commission Staff on Nov. 8, 2019
Pine Avenue Ramp:
• This ramp raises significant questions about vulnerability to coastal hazards. How long until the
ramp is subject to wave action and then what happens once it is threatened?
• The proposed ramp is designed to go over the top of the existing rip-rap. This design
approach will help to mitigate vulnerability to coastal hazards.
• Given that this ramp seems to be located in a more exposed location than the Tamarack ramp, is
it necessary? Why not just the Tamarack ramp? Will this ramp require any change to the existing
rip rap at the end of the seawall/promenade?
• As part of the feasibility evaluation, a stakeholder group was developed consisting of
wheelchair bound Carlsbad residents. Most of these residents live in Carlsbad's
Village area because the neighborhood is relatively flat and various services are
available (i.e. drugstores, grocery stores, etc.) This stakeholder group unanimously
selected the Pine Avenue location as their highest priority location due to proximity to
where they live. In addition, as part of the feasibility study a pedestrian activity
analysis was performed for this project and the results showed that the existing Pine
Avenue Access Ramp had a total daily pedestrian volume of 5,720, with a peak hour
volume of 536 counts. This represented the highest pedestrian volume compared to
the other access points along the bluff. These two factors make the Pine Avenue ramp
location the highest priority location for the city.
The proposed ramp may require minor changes to the existing rip rap adjacent to the
existing shower. This will be determined during final design with a focus on
minimizing the changes to the existing rip rap. The project does not intend to add any
new rip rap and will only re-position pieces that are absolutely necessary. Based on
the current design, approximately two pieces would need to be repositioned. The
proposed ramp is designed to go over the top of the existing rip-rap. This may allow
the project to protect all existing rip rap in place.
• Could the ramp be shorter? I see that it starts adjacent to the accessible parking stall in the Oak
Street parking lot, but could it be shortened and connect to the bluff top walkway farther
downcoast?
• Per the U.S. Access Board, the maximum rise for any ramp with a slope greater than
5% shall be 30-inches (2.5-feet). For ramps with rises greater than 30-inches, a 5' x 5'
flat landing is required after each 30-inch rise. The elevation difference between the
beach and the top of the bluffs is approximately 24-feet. Based on ADA standards, this
difference in height requires approximately 9 landings. In order to meet ADA
requirements, the ramp cannot become shorter.
• Can the Viewing Deck be eliminated? There are already benches on either side of the proposed
viewing deck/entrance to the ramp.
July 21, 2020 Item #7 Page 153 of 157
• Yes, we will revise the conceptual design to remove the viewing deck at Pine Avenue.
We will also reflect this change in the associated text of the feasibility report.
• Why is 10ft the appropriate width? The proposed wood ramp down to Tamarack State Beach is
8ft wide. Why the difference? Does a narrower ramp change the footprint necessary for the
support columns? What is the minimum width required for ADA access?
• We are willing to revise the width of the ramp to be 8 feet wide. This change will
mean a smaller footprint for the support columns. Per the U.S. Access Board, the
minimum passing space for an accessible route is 60-inches (5-feet). However, based
on the pedestrian volumes (nearly 5,000/day) and the fact that users will have
wheelchairs, strollers, surfboards, coolers, beach umbrellas, etc., we feel that 8 feet
should be the minimum width for this ramp.
• It's hard to see on the visual simulation, but it looks like the ramp extends out onto flat sand
area — does it? If so, how much (sq. ft.) of existing sandy beach area would be impacted?
• Yes, the ramp does extend onto the flat sand area. Approximately 200 SF of sand will
be impacted. The proposed ramp is designed to go over the top of the existing rip-rap
to minimize the amount of sand that would be impacted.
• Is the path beyond the end of the ramp (see 5 on sheet 3) concrete? Just sand? Will there be any
curb, railing, etc. along that portion?
• Yes, the conceptual design proposes concrete for the at-grade path beyond the end of
the ramp to tie-in to the concrete adjacent to the existing restroom. There is no curb,
railing, etc. currently proposed for this at-grade concrete path. The proposed ramp is
designed to go over the top of the existing rip-rap to minimize the amount of sand
that would be impacted.
• How does the ramp affect vegetation on the slope? If native habitat requiring mitigation would
be impacted, can the mitigation requirement be met onsite? Will loss of existing vegetation
affect stability of the slope at all?
• The proposed ramp will affect some native vegetation on the slope. As part of the
feasibility evaluation, a habitat value assessment was completed along the bluffs and
was mapped from the north end of the parking lot (north of Pine Avenue) to the Cold-
Water Inlet (south of Tamarack Avenue). The area where the Pine Avenue ramp is
proposed is approximately 75% unvegetated and would be less impactful than
locating the ramp in other vegetated areas within the study area.
The vegetation that will be affected is the native vegetation located directly beneath
the ramp footprint and its shade footprint (to a lesser degree). Impacted native
vegetation will be mitigated on-site, adjacent to the proposed ramp. There will be no
net loss of native vegetation resulting from the project.
The loss of vegetation is not anticipated to affect the stability of the slope. The ramp
has been designed to have the piers pile driven into the bluff. This reduces the
footprint of soil disturbance while maintaining structural integrity of the bluff. As part
of the feasibility evaluation, a geotechnical engineer reviewed the proposed design
and concluded that "since the proposed pile supports are entirely in the bluffs, putting
it in formational soil (Terrace Deposits), liquefaction would not be an issue."
2
July 21, 2020 Item #7 Page 154 of 157
• Where would existing showers be relocated to? (see 9 on Sheet 3) What is the extent of work
required to achieve that (additional paved area, relocation of water line, new drainage)?
• The showers would be relocated approximately 55 feet to the south. The extent of
work would include removal of existing paved area, replacement with new paved
area, waterline relocation, and potentially a new sewer connection.
Tamarack Beach Ramp:
• How wide is the existing ramp to the restroom? Would the proposed concrete ramp be moving
any further seaward on the bluff than what is out there now?
• The existing ramp width to the restroom is 10-feet. The proposed design of this ramp
will have no change to the location of the western edge of the ramp. The ramp would
only be replacing / improving what is currently there today, and not extend seaward.
• Why is 10ft the appropriate width for the concrete ramp (see 1 on sheet 5)? The wooden
portion of the ramp is only 8ft wide. What is the minimum width required for an ADA ramp?
• The 10-foot ramp is the existing ramp width; the proposed design makes the ramp
ADA compliant (the existing ramp is too steep) but does not change the existing ramp
alignment or width and intends to keep the 10-foot width. See above for minimum
ADA requirements. The ramp that extends south of the restroom is proposed to be 8
feet wide.
• Is there any change in the footprint of the stairs (see 3 on sheet 5)?
• The proposed design will require no change to the footprint of the stairs.
• How does the ramp affect vegetation on the slope? If native habitat requiring mitigation would
be impacted, can the mitigation requirement be met onsite? Will loss of existing vegetation
affect stability of the slope at all?
• The proposed ramp will affect native vegetation on the slope. As part of the feasibility
evaluation, a habitat value assessment was completed along the bluffs was mapped
from the north end of the parking lot (north of Pine Avenue) to the Cold-Water Inlet
(south of Tamarack Avenue). The area where the Tamarack Avenue ramp is proposed
was considered to be of high value.
The native vegetation that will be affected is the vegetation located directly beneath
the ramp footprint and its shade footprint (to a lesser degree). Impacted native
vegetation will be mitigated in the area on the east side of the access drive into the
Tamarack State Beach parking lot.
As stated above, the loss of vegetation is not anticipated to affect the stability of the
slope. The ramp has been designed to have the piers pile driven into the bluff. This
reduces the footprint of soil disturbance while maintain structural integrity of the
bluff. As part of the feasibility evaluation, a geotechnical engineer reviewed the
proposed design and concluded that "since the proposed pile supports are entirely in
the bluffs, putting it in formational soil (Terrace Deposits), liquefaction would not be
an issue."
3
July 21, 2020 Item #7 Page 155 of 157
• Does the proposed accessible path to the parking lot (see 6 on sheet 5) extend concrete
seaward of the existing limits of the parking lot? If so, why is it necessary? How much (sq. ft.) of
sand area would be impacted? Can that be accommodated within the existing parking lot? Will
there be any curb or railing along that portion?
• This accessible path is actually part of the Cold-Water Tunnel project, not the
Tamarack ADA ramp project. The accessible path would extend some concrete
seaward (approximately 350 SF). This path is necessary to allow for ADA access from
the bottom of the ramp/end of the lower sea wall to the sand. Currently, there is no
ADA accessible path of travel from the end of the lower sea wall to the sand. A railing
may be appropriate for this short ramp. The idea is to extend an ADA path of travel to
the proposed Cold-Water Tunnel (see sheet 7 of the conceptual plan set).
Cold Water Tunnel:
• Why is ADA access to the lagoon trail necessary? The lagoon trail is not currently paved, and
these conceptual plans do not improve the entire length of the lagoon trail. Is the lagoon trail
currently ADA accessible? Any plans to improve the lagoon trail for ADA access?
• The primary goal of this project is to provide trail connectivity between the lagoon
trail and the beach, not for ADA access. However, any new connection should be built
to meet ADA requirements. The proposed tunnel allows for a direct connection
(under Carlsbad Boulevard) between the beach and the lagoon trail. This will create
new access for the many beach users to the lagoon, enhancing the value of the lagoon
as a natural resource. The lagoon trail is not currently ADA accessible. The lagoon
trail is maintained by the Agua Hedionda Lagoon Foundation. Any future
improvements to the lagoon trail would be carried out by the Foundation.
• If ADA access is required from the beach lot to the lagoon trail, why isn't the Tamarack ramp to
Carlsbad Blvd and then crossing at the proposed crosswalk sufficient?
• The suggested connection is circuitous and would require a pedestrian to walk 1600
feet from the middle of the Tamarack State Beach parking lot, compared to 600 feet
utilizing the proposed tunnel. The suggested connection includes some large grade
changes, making it difficult for the certain segments of the population. The suggested
connection also requires two street crossings at high vehicular traffic volume
locations. The suggested connection will not allow for ADA access to the trail unless
the ramp from Carlsbad Boulevard, down to the trail is constructed. The proposed
tunnel provides vehicle-free access to and from the beach and the lagoon trail. The
proposed crosswalk is actually part of a separate City project (Tamarack and Carlsbad
Boulevard Pedestrian and Bicycle Enhancements project). Ultimately, this pedestrian
crossing may or may not be built by that project. We will remove this crosswalk from
the conceptual plans. If this proposed crosswalk is constructed it will provide a more
convenient way for people on the west side of Carlsbad Boulevard to access the trail,
but it will not help the mobility challenged population who are at the beach get up to
the west side of Carlsbad Boulevard or get down from Carlsbad Boulevard to the trail.
4
July 21, 2020 Item #7 Page 156 of 157
• Would the proposed crosswalk be signalized?
• As stated above, the proposed crosswalk is actually part of a separate City project
(Tamarack and Carlsbad Boulevard Pedestrian and Bicycle Enhancements project).
Ultimately, this pedestrian crossing may or may not be built by that project. We will
remove this crosswalk from the conceptual plans.
• On the lagoon side, are two ramps necessary? Why not leave the access up to Carlsbad Blvd in
its current condition (no stairs, no paving)?
• The two ramps allow ADA access for crossing under the boulevard. One ramp allows
access under the boulevard and the other ramp provides access from Carlsbad
Boulevard. Although not the focus of the project, the project team felt it was
appropriate to provide ADA access from Carlsbad Boulevard to the trail to give the
mobility challenged population an alternative for trail access.
• How wide is the proposed box culvert (see 4 on sheet 7) and the proposed concrete ADA ramp
(see 6 on sheet 7)? What is the minimum width required for ADA access?
• The width of the proposed box culvert is 12-feet. This is a typical minimum width for
this type of undercrossing (i.e. Coaster undercrossing in Encinitas) The width for the
proposed concrete ADA ramp will be 8-feet. The minimum passing space clear width
for the proposed ramp design is 60-inches (5-feet) per the U.S. Access Board.
Could the access path leading from the parking lot to the underpass be realigned to minimize
concrete on sand area — can it connect from the base of the stairs directly to the entrance of the
underpass?
• The proposed alignment is designed to create a berm near the tunnel, preventing
flooding inside the tunnel. It is also designed to be ADA compliant. The suggested
alignment would not provide the length needed to meet ADA and incorporate a berm
to minimize vulnerability to coastal hazards.
Permit Jurisdiction:
• Do you have a MHTL survey for the Pine Avenue and Tamarack ramp areas? It appears that the
City and CCC probably share permit authority over both projects. The entire Cold Water
Tunnel/crosswalk project is located within the Agua Hedionda segment, and so is located within
CCC permit authority. Have you considered how you want to process the CDP for these projects?
It seems appropriate to process them all together, and CCC could do that through a consolidated
permit. Let's discuss.
• The city will issue a CDP for project components located within the Mello II Segment of
the city's LCP (north of Tamarack Avenue and above the MHTL) and will apply for a CDP
from the CCC for project components located within the Agua Hedionda Lagoon
Segment (south of Tamarack Avenue and below the MHTL), where the CCC has retained
permitting authority.
5
July 21, 2020 Item #7 Page 157 of 157
Steve Linke <splinke@gmail.com >
Friday, July 17, 2020 10:22 PM
City Clerk
Nathan Schmidt; Kyle Lancaster
7/21/2020 City Council Item #7: ADA sidewalk ramp and Tamarack State Beach tunnel
projects
Tammy Cloud-McMinn
From:
Sent:
To:
Cc:
Subject:
All Receive - Agenda Item #
For the Information of the:
CITY COUNCIL
Date CA CC •
CM ACM DCM (3)-
Honorable Mayor and City Council:
The staff report on this item states that all three of the projects in this item were unanimously recommended by the
Traffic and Mobility Commission. While the vote recommending the two sidewalk ramp projects was unanimous (7-0),
Commissioner Johnson and I voted against recommending the tunnel (5-2).
Our meeting minutes also were not included in the staff report, so I will report that I raised a concern that there was a
lower level of public outreach and no assessment of demand for the tunnel, unlike what was done for the ramps.
However, I also expressed that it would be nice to see all three projects completed, if the funding was available (and
other similar projects elsewhere were not in need of funding), but that, if funding was an issue, the three projects might
be prioritized as follows.
1. Pine Avenue sidewalk ramp: Current slope is 15.6%, compared to the 8% ADA goal ($2.8 million)
2. Tamarack Avenue sidewalk ramp: Current slope is 9.9% ($2.8 million)
3. Lagoon-beach tunnel ($3 million)
The full audio of the commission's discussion on this item is available at tinyurl.com/y2a2z7lk starting at 18:08, as part of
my T&MC audio/video YouTube channel with a homepage at tinyurl.com/y36934qt.
These projects also raise interesting questions around Prop H (the $1 million city funding limit), and the exceptions
introduced by Prop C (including "construction of trail linkages") and the Prop H Guidelines adopted by council (including
"upgrades of existing facilities"). The resolution in the staff report considers the sidewalk ramp projects to be
constructions of trail linkages, which may be a stretch of the voter intent on Prop C. However, that may still be better
than the "upgrades of existing facilities" category from Guideline 6, because the original Prop H specifically excludes
"modification, enlargement, or alteration of existing improvements."
The awkward questions are what is defined as a "trail linkage" and exactly what is the distinction between an "upgrade
of an existing facility" and a "modification or alteration of an existing improvement"? Perhaps it is time for voters to re-
visit Prop H (at least the dollar limit) to give council broader power to fund capital projects, particularly given how much
has changed in the 38 years since it was passed, including the value of a dollar. That would alleviate the need to fit these
round pegs into square holes, and then relying on nobody taking legal action as the confirmation that it was OK.
Best regards,
Steve Linke
Carlsbad, CA
CAUTION: Do not open attachments or click on links unless you recognize the sender and know the content
is safe.
1
AU Receive - Agenda Item #
For the Information of the:
CITY COUNCIL
Date ' CA CC
CM ACM 'DCM (3)
City of
Carlsbad
Council Memorandum
July 21, 2020
To: Honorable Mayor Hall and Members of City Council
From: Gary Barberio, Deputy City Manager, Community Services
Paz Gomez, Deputy City Manager, Public Works
Via Geoff Patnoe, Assistant City Manager P
Re: Additional Materials Related to Staff Report Item No. 7— Americans with
Disabilities Act Beach Access Feasibility Study and Trail Connectivity to Tamarack
State Beach Feasibility Study
This memorandum provides additional information and a correction to the staff report for the
July 21, 2020 City Council Meeting Item No. 7 — Americans with Disabilities Act Beach Access
Feasibility Study and Trail Connectivity to Tamarack State Beach Feasibility Study.
The staff report indicates that the Traffic and Mobility Commission voted unanimously to
support staff's recommendation to approve the studies. This statement should be revised to
indicate that the Traffic and Mobility Commission voted unanimously (7-0) to approve staff's
recommendation of the ADA Beach Access and Feasibility Study and approved staff's
recommendation of the Trail Connectivity to Tamarack State Beach Feasibility Study by a vote
of 5-2. Additional information is provided in the minutes of the Traffic and Mobility Commission
meeting held on Feb. 3, 2020 (Attachment A).
Minutes of the Beach Preservation Commission meeting held on Feb. 4, 2020 and the Parks and
Recreation Commission meeting held on Feb. 24, 2020 are provided as Attachments B and C,
respectively.
Attachments: A. Minutes of the Traffic and Mobility Commission Meeting, Feb. 3, 2020
B. Minutes of the Beach Preservation Commission Meeting, Feb. 4, 2020
C. Minutes of the Parks and Recreation Commission Meeting, Feb. 24, 2020
cc: Scott Chadwick, City Manager
Celia Brewer, City Attorney
Ron Kemp, Assistant City Attorney
Robby Contreras, Assistant City Attorney
Allegra Frost, Deputy City Attorney
Public Works Branch
Transportation Department
Faraday Center 1635 Faraday Ave I Carlsbad, CA 92008 I 760-602-2766
Tom Frank, Transportation Director
Nathan Schmidt, Transportation Planning and Mobility Manager
Kyle Lancaster, Parks & Recreation Director
Kristina Ray, Communication & Engagement Director
Sheila Cobian, Assistant to the City Manager
Faviola Medina, City Clerk Services Manager
Attachment A
Council Chambers
1200 Carlsbad Village Drive
Carlsbad, CA 92008
Minutes
TRAFFIC AND MOBILITY COMMISSION
Monday, Feb. 3, 2020, 5:02 p.m.
CALL TO ORDER: Chair Gocan called the Meeting to order at 5:00 p.m.
ROLL CALL: Present: Gocan, Johnson, Hunter, Penseyres, Fowler, Linke and Perez.
APPROVAL OF MINUTES:
Motion by Vice-Chair Johnson, seconded by Commissioner Perez, to approve the minutes for Jan. 6,
2020.
Motion carried: 5/0/2 (Abstained: Gocan and Hunter)
PUBLIC COMMENTS ON ITEMS NOT LISTED ON THE AGENDA:
Lela Panagides, a Carlsbad resident, requested staff to study the possibility of getting a left turn signal
light going from Tamarack Avenue to College Boulevard.
- Sophia Gocan, Josie Mitchell, Isabel Owens and Sophia Owens (Valley Girls 2.0 Robotics team), from
Valley Middle School, presented a comprehensive study about safety on the sidewalks in various cities
and proposed an installation of sensors on the sidewalks to detect any danger situation.
DEPARTMENTAL REPORTS:
1. POLICE MONTHLY REPORT — (Staff contact: Lieutenant Christie Calderwood, Police
Department) — Cancelled
2. EL CAMINO REAL AND COLLEGE BOULEVARD INTERSECTION IMPROVEMENTS — (Staff
Contact: Brandon Miles, Public Works).
Staff Recommendation: Approve staff recommendations
Associate Engineer Miles described the improvements for bicycle and pedestrian access with
upgrades to the curb ramps and crosswalks at the intersection of El Camino Real and College
Boulevard.
- Commissioner Linke inquired about the segment on El Camino Real that it is one of the
segments that is deficient on the Level of Service(LOS) and how this project will impact the LOS.
Will the new design be able to accommodate the high volume of cars on the intersection?
He also asked if an intersection analysis has been done on the intersection of El Camino Real and
College Boulevard.
- City Traffic Engineer Kim explained that the use of a right turn overlap will compensate for the
high volume of cars eastbound turning right.
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Attachment A
o Associate Engineer Miles explained that the project was designed with the vision of the
extension of College Boulevard southbound.
. Commission Hunter expressed his concern of improving pedestrian service without a
documented need to address a specific issue, especially if it comes at degrading service to auto
users.
. Commissioner Fowler supports the project and understands the need to make the intersection
safe for bicyclists and pedestrians.
. Commissioner Penseyres recommended adding R4-4 "Begin Right Turn Lane Yield to Bikes"
sign, based on the California MUTCD. Green paint before and after the merge area would
provide clearer guidance for bicyclists and motorists in the "weaving" area.
o Commissioner Perez inquired if there is an estimated date for the extension of College
Boulevard project.
o City Traffic Engineer Kim replied that the item about the extension of College Boulevard will
come to the T&MC next month.
Commissioner Linke recommended staff conduct an intersection LOS analysis on El Camino
Real and College Boulevard
Commissioner Linke would like the minutes to show that the city should continue to conduct
intersection LOS. He stated that staff should identify a solution to address the deficiencies on
ECR instead of proposing an exemption on the segment.
Motion by Commissioner Hunter, seconded by Commissioner Linke, to support staff recommendation of
improvements to the intersection of El Camino Real and College Boulevard, CIP Project No. 6071.
Motion carried: 7/0
3. AMERICAN WITH DISABILITIES ACT BEACH ACCESS FEASIBILITY STUDY— (Staff Contact:
Nathan Schmidt, Public Works) — Approve Staff recommendations
Transportation Planning and Mobility Manager Schmidt is asking the T&MC to approve the
Americans with Disabilities Act (ADA) Beach Access Feasibility Study and the Trails Connectivity
to Tamarack State Beach Feasibility Study.
Commissioner Perez recommended a barrier/protection along the edge lines of the pathway
along ECR to prevent the bicyclist from hitting a pedestrian or getting slammed on incoming
traffic.
Commissioner Linke inquired if City Council has a priority list on projects to develop within the
city.
• Deputy City Manager Gomez explained that until a year ago we did not have a scoring matrix
within the city, however, last year staff institute a scoring matrix that was presented to the City
Council. If there are specific projects that City Council wants to prioritize they vote on it and staff
move forward.
Commissioner Fowler asked about if a lawsuit was the motive to improve the Beach
Accessibility.
Transportation Planning and Mobility Manager Schmidt explained that we had no lawsuit
involved in the process of improving beach accessibility.
Commissioner Penseyres inquired if there are plans to improve the trail beyond the cut-cover
tunnel that connects to the neighborhood.
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Attachment A
. Transportation Planning and Mobility Manager Schmidt answered that now there are no plans
to improve the trail connectivity but the Sustainable Mobility Plan could potentially address the
issue and work on better access to the neighborhood.
" Vice-Chair Johnson inquired if this project requires Coastal Commission approval.
Transportation Planning and Mobility Manager Schmidt said yes, they are working with the
Coastal Commission.
Motion by Commissioner Hunter, seconded by Commissioner Perez to approve staff recommendation of
the ADA Beach Access Feasibility Study - CIP 6065
Motion carried: 7/0
Motion by Commissioner Perez, seconded by Commissioner Penseyres to approve staff
recommendation on Trail Connectivity to Tamarack State Beach Feasibility Study - CIP 4063
Motion carried: 5/2 — (No: Johnson and Linke)
Commissioner Linke would like the minutes to show that he is not opposed to the project, but he is
voting 'No" to show that in his opinion this project should be the lowest priority among the three, due
to the lack of a projected usage study or public outreach.
4. ELECT A NEW TRAFFIC AND MOBILITY COMMISSION CHAIR AND VICE-CHAIR — (Staff
Contact: Doug Bilse, Public Works)
Staff Recommendation: Elect a new Chair and Vice-Chair
Motion by Commissioner Hunter, seconded by Commissioner Perez, to elect Vice-Chair Johnson to be
the Chair and Commission Fowler to be the Vice-Chair.
Motion was retracted by Commissioner Hunter
Motion by Chair Gocan, seconded by Vice-Chair Johnson, to extend the Chair and Vice-Chair term to
June 30, 2020.
Motion approved: 6/0/1 (Abstained: Fowler)
CITY TRAFFIC ENGINEER COMMENTS:
City Traffic Engineer Report — Attachment A
TRAFFIC & MOBILITY COMMISSION COMMENTS:
Commissioner Perez would like to get information from the Police Department about an occurrence on
January 17, 2020, of a car following two students of HOPE Elementary School.
City Traffic Engineer Kim will get in touch with Lt. Calderwood and send an email to all commissioners with
the requested information.
Commissioner Linke inquired about the resident request on a left turn signal light going from Tamarack
Avenue to College Boulevard.
Commissioner Linke informed the commissioners and staff that he will not be present at T&MC March 2,
2020 meeting but he would like to submit written inputs to the items on the Agenda.
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Attachment A
Commissioner Hunter reported, on behalf of Lt. Calderwood, on some police activities on the month of
January. Motorcycle officers working on the weekend and City Council approved parking enforcement on
Carlsbad Village.
Vice-Chair Johnson requested staff to investigate the different speed limits on Avenida Encinas from
Cannon Road to Poinsettia Lane.
Commissioner Penseyres suggested that the Motorcycle Officers should focused on drivers using cellular
phones that are not hands free.
ADJOURNMENT:
Chair Gocan adjourned the Traffic & Mobility Commission Meeting on Feb. 3, 2020, at 7:15 p.m.
Eliane Paiva
Eliane Paiva, Minutes Clerk
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Attachment B
MINUTES
MEETING OF:
DATE OF MEETING:
TIME OF MEETING:
PLACE OF MEETING:
BEACH PRESERVATION COMMISSION
February 4, 2020
4:00 p.m.
City Council Chambers
1200 Carlsbad Village Drive
CALL TO ORDER: The meeting was called to order at 4:03 pm.
ROLL CALL:
Present Members: Chairperson Petrucci, Commission Members Briggs, Prietto, Steindlberger and
O'Malley
Absent Members: Commissioner Colby
Guests: None
City/State Staff: Kyle Lancaster, Tim SeIke, Michael Tully, and Adriana Alvarez
APPROVAL OF MINUTES
Minutes for the meeting of December 3, 2019 were approved (5-0-0-1).
1. SR #0220-1 ADA BEACH ACCESS FEASIBILITY STUDY AND TRAIL CONNECTIVITY TO TAMARACK STATE BEACH
FEASIBILITY STUDY
Kyle Lancaster, parks and recreation director, gave an overview of the American with Disabilities Act (ADA)
Beach Access Feasibility Study and the Trail Connectivity to Tamarack State Beach Feasibility Study. On July 24,
2018, the City Council adopted a resolution authorizing the execution of a Professional Services Agreement for
the preparation of both feasibility studies. The studies evaluate alternatives to construct ADA accessible
pedestrian walkways and ramps to provide a connection from Carlsbad Boulevard to the beach, as well as the
potential for a trail connection from the North Shore Agua Hedionda Lagoon Trail to Tamarack State Beach. The
ADA Beach Access Feasibility Study evaluated five alternatives using criteria established by the project team.
The project team goals were to develop up to two preferred alternatives for ADA beach access. The two
preferred alternatives selected for this purpose are located north of Pine Avenue, and adjacent to Tamarack
Avenue. The Trail Connectivity to Tamarack State Beach Feasibility Study evaluated the feasibility of
constructing a tunnel or undercrossing to connect the North Shore Agua Hedionda Lagoon to Tamarack State
Beach. Staff is scheduled to present informational reports regarding the feasibility studies to the Parks &
Recreation Commission on Feb. 24, 2020, and to the City Council on March 17, 2020.
Commissioner Prietto asked if the State was funding any of the ADA improvements and what are the challenges
the city faces.
Commissioner Steindlberger asked if the State has been part of the process since the beginning of the project,
and what kind of devices have been looked to get to the beach with a walker. She also inquired if the other
beach accesses throughout the city have been considered for ADA improvements.
Commissioner Briggs inquired about the construction material that is being considered for the ADA access ramp.
Chair Petrucci requested "no dogs allowed" signs be added on the new potential ADA ramp.
2. SR #0220-2 ELECTION OF OFFICERS
The Committee nominated and re-appointed Commissioner Petrucci as the Chair and nominated and appointed
Commissioner Briggs as the new Vice-Chair.
3. SR# 0220-3 ELECTION OF AD-HOC COMMITTEE FOR PLANNING AND COORDINATIONG A NORTHERN BEACH
CLEAN-UP EVENT
The Commission nominated and appointed Commissioners Prietto, Briggs and Steindlberger as the Ad-Hoc
committee for this purpose.
4. SR# 0220-4 STATE OF CA DEPARTMENT OF PARKS & RECREATION ACTIVITIES
Michael Tully, parks planner, presented the State of California Department of Parks & Recreation Activities
Report on behalf of Lisa Urbach, north sector superintendent, San Diego Coast District. The work continues on
Attachment B
BEACH PRESERVATION COMMISSION
Minutes of February 4, 2020
Page 2
the Encinitas Beach Resort and it is expected to be completed by the end of 2020. The dredging project at the
Batiquitos Lagoon has been completed, however grading of South Ponto Beach is still ongoing and bech remains
closed. The grading is expected to be completed by February 7, 2020. The State of California Department of
Parks & Recreation have been working with scientists at Scripps Institute of Oceanography on flood
preparedness in the Tamarack State Beach parking lot, through coastal data gathering. An Earth day event will
be held on April 18, 2020 from 9am-1pm at the Tomato Fields on Manzano Dr, please visit
www.calparks.org/earthday for more information on volunteer opportunities. A project agreement to restore
the historic adobe wall at the State of California Department of Parks & Recreation's San Diego Coast District
north sector office, should be in place by July 1, 2020 and construction will likely begin by Fall 2020. The South
Carlsbad State Beach campground store is under new management and the contract should be finalized by May
2020. The store is expected to open by Summer 2020.
Kyle Lancaster, parks & recreation director, gave an update on the State of California Parks & Recreation
Department Request for Proposals (RFP), issued on Jan. 9, 2020 for fitness and recreation concession at the
Carlsbad and South Carlsbad State Beaches. Public comment was received at the Jan. 14, 2020 City Council
meeting and the City Council approved a minute motion for an item on the RFP to be brought forward for
exploration. On Jan. 21, 2020 the State of California Department of Parks & Recreation issued a cancellation of
the RFP and a few days later the City of Carlsbad Parks & Recreation Department staff communicated with State
of California Department of Parks & Recreation staff. On the Jan. 28, 2020, the City Council directed parks &
recreation department staff to proceed with preparing a bid, should the RFP be re-issued. The City Council also
gave authorization to engage in discussions with the State of California Parks & Recreation Department staff for
other options on the subject concessions.
5. COMMISSIONER/COMMITTEE REPORTS AND AGENDA ITEMS FOR FUTURE COMMISSION MEETINGS
No future agenda items proposed.
ADJOURNMENT
By proper motion, the meeting was adjourned at 5:14 pm. The next meeting of the Beach Preservation Commission
will be Tuesday, April 7, 2020 at 4:00 p.m., in the City Council Chambers, 1200 Carlsbad Village Drive, Carlsbad, 92008.
Michael Tully
Park Planner
Attachment C
MINUTES
Minutes of: PARKS & RECREATION COMMISSION
Time of Meeting: 5:30 P.M.
Date of Meeting: Feb. 24, 2020
Place of Meeting: Council Chamber
CALL TO ORDER
Chair Luna called the meeting to order at 5:33 p.m.
ROLL CALL
Present: Chair Luna, Commissioners Simons, Thorp, Livingston, Allemann and
Pearson.
Absent: Vice Chair Martinez
PLEDGE OF ALLEGIANCE
AN
None.
APPROVAL OF MINUTES
ACTION: On motion by Commissioner Simons and a second by Commissioner Living-
ston, the minutes of the Jan. 27, 2020 parks & recreation commission meet-
ing were approved.
AYES: Chair Luna, Commissioners Simons, Livingston, Allemann and Pearson.
NOES: None
ABSTAIN: Commissioner Thorp
ABSENT: Vice Chair Martinez
PRESENTATIONS
None
CONSENT CALENDAR:
None
PUBLIC COMMENT
Linda Schlesinger, a Carlsbad resident spoke regarding the Monroe Street Pool facility as-
sessment and the necessity for repairs and improvements.
1. SR # 0220-1 ADA BEACH ACCESS FEASIBILITY STUDY AND TRAIL CONNECTIV-
ITY TO TAMARACK STATE BEACH FEASIBILITY STUDY
Kyle Lancaster, parks and recreation director, gave an overview of the American with
Attachment C
Disabilities Act (ADA) Beach Access Feasibility Study and the Trail Connectivity to Tam-
arack State Beach Feasibility Study. The ADA Beach Access study evaluates the op-
tions for construction of ADA accessible pedestrian walkways/ramps to provide a com-
pliant connection from Carlsbad Boulevard to the beach. The Trail Connectivity to Tam-
arack State Beach study evaluates the options for a trail connection from the North
Shore Agua Hedionda Lagoon Trail to Tamarack State Beach. The project team goals
were to develop up to two preferred alternatives for ADA beach access. The two pre-
ferred walkway/ramp options selected for this access are located (1) adjacent to the
intersection of Pine Avenue, and (2) adjacent to the intersection of Tamarack Avenue.
The Trail Connectivity to Tamarack State Beach study determined a preferred option of
constructing a 'cut and cover tunnel' to connect the North Shore Agua Hedionda Lagoon
to Tamarack State Beach. Staff is scheduled to present an informational report regard-
ing the feasibility studies to the City Council on March 17, 2020.
Commissioner Thorp asked if there will be more handicap spots at the north parking lot.
Mr. Lancaster said that the number of handicapped stalls is based on the total number
of parking stalls available in the parking lot and we are currently compliant with the num-
ber of handicapped parking stalls. It is something that could be considered, however,
as the number of handicapped stalls increases, the number of total parking stalls de-
creases. Staff would need to consult with the State of California Department of Parks &
Recreation, as the Ocean Street Sculpture Park parking lot is half owned by the state.
Commissioner Simons asked why the state would not take this responsibility rather than
force the city to do so. He also inquired as to whether grants we can apply for to assist
with funding.
Mr. Lancaster mentioned the city has proposed this to provide access for our residents
and visitors. The state does not have the resources the city does. As part of a one year
right of entry permit obtained the last six years straight, the city maintains the Tamarack
upper picnic facilities and the coastal bluffs. The city has done that because the state's
level of maintenance was not something the city considered sufficient for our residents
and visitors. The state has not expressed an ability to fund a portion of these projects,
there are some grants that could be reviewed for possible application to these projects.
Commissioner Livingston asked if the cut and cover tunnel would require shutting down
Carlsbad Blvd.
Mr. Lancaster explained that the construction specifics have not been realized at this
point. In all likely hood there would be a need to address closing one-half of the roadway
over certain nights and then the other half other nights.
Commissioner Allemann, as someone who has taken a wheelchair down the existing
ramps, stated anything will be an improvement. She would like to see the city and state
coordinate to have access mats continue onto the sand, as the ramps reach the beach.
Mr. Lancaster agreed that is the intent.
Attachment C
2. SR # 0220-2 DEPARTMENT REPORT
Recreation Services Manager Mike Pacheco and Parks Services Manager Tim SeIke
and Parks & Recreation Director Kyle Lancaster reported on recently completed, ongo-
ing and upcoming parks & recreation department programs, events, and park projects.
Mr. Pacheco, Mr. SeIke and Mr. Lancaster were available for clarifying questions from
the commission.
COMMITTEE/CITY COUNCIL REPORTS
None
AGENDA ITEMS FOR FUTURE COMMISSION MEETING
ADJOURNMENT
ACTION:
AYES:
NOES:
ABSTAIN:
ABSENT:
On motion by Commissioner Simons second by Commissioner Thorp,
the meeting was adjourned at 6:29 p.m. The next meeting of the parks
& recreation commission will be March 16, 2020, Council Chamber at
5:30 p.m.
Chair Luna, Commissioners Simons, Thorp, Livingston, Allemann and
Pearson
None
None
Vice Chair Martinez
Respectfully submitted,
Charlene Buckalew
Minutes clerk