HomeMy WebLinkAboutCT 14-07; BEACHWALK AT ROOSEVELT; STORM WATER QUALITY MANAGEMENT PLAN; 2016-08-01CITY OF CARLSBAD
PRIORITY DEVELOPMENT PROJECT (PDP)
STORM WATER QUALITY MANAGEMENT PLAN (SWQMP)
FOR
BEACHW ALK AT Roosevelt
2685, 2687 & 2715 Roosevelt Street
CT 14-07 I RP 14-20
DWG 490-6A
SWQMP No. 15-28
ENGINEER OF WORK:
Brian Ardolino, Project Engineer
Pasco Laret Suiter & Associates
535 N. Highway 101 , Suite A
Solana Beach, CA 92075
858.259.8212
Brian Ardolino ACE 71651
PREPARED FOR:
Geoff McComic
Vesta Pacific Development
1818 First Avenue, Suite 100
San Diego, CA 92131
619.481 .3830
PREPARED BY:
Pasco Laret Suiter & Associates
535 N. Highway 101 , Suite A
Solana Beach, CA 92075
858.259.8212
DATE:
August 2016
V
DEC O 5 2017
LAND D ... \/ t=LOJ-JMENT
E:-I I JI ._..=RING
Beachwalk at Roosevelt
TABLE OF CONTENTS
Certification Page
Project Vicinity Map
FORM E-34 Storm Water Standard Questionnaire
Site Information
FORM E-36 Standard Project Requirement Checklist
Summary of PDP Structural BMPs
Attachment 1 : Backup for PDP Pollutant Control BMPs
Attachment 1 a: OMA Exhibit
Attachment 1 b: Tabular Summary of DMAs and Design Capture Volume Calculations
Attachment 1 c: Harvest and Use Feasibility Screening (when applicable)
Attachment 1d: Categorization of Infiltration Feasibility Condition (when applicable)
Attachment 1 e: Pollutant Control BMP Design Worksheets I Calculations
Attachment 2: Backup for PDP Hydromodification Control Measures
Attachment 2a: Hydromodification Management Exhibit
Attachment 2b: Management of Critical Coarse Sediment Yield Areas
Attachment 2c: Geomorphic Assessment of Receiving Channels
Attachment 2d: Flow Control Facility Design
Attachment 3: Structural BMP Maintenance Thresholds and Actions
Attachment 4: Single Sheet BMP (SSBMP) Exhibit
Beachwalk at Roosevelt
CERTIFICATION PAGE
Project Name: Beachwalk at Roosevelt
Project ID: CT 14-07 / RP 14-20
I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs for
this project, and that I have exercised responsible charge over the design of the project as defined
in Section 6703 of the Business and Professions Code, and that the design is consistent with the
requirements of the BMP Design Manual, which is based on the requirements of SDRWQCB
Order No. R9-2013-0001 (MS4 Permit) or the current Order.
I have read and understand that the City Engineer has adopted minimum requirements for
managing urban runoff, including storm water, from land development activities, as described in
the BMP Design Manual. I certify that this SWQMP has been completed to the best of my ability
and accurately reflects the project being proposed and the applicable source control and site
design BMPs proposed to minimize the potentially negative impacts of this project's land
development activities on water quality. I understand and acknowledge that the plan check review
of this SWQMP by the City Engineer is confined to a review and does not relieve me, as the
Engineer in Responsible Charge of design of storm water BMPs for this project, of my
responsibilities for project design.
Brian Ardolino
Print Name
Pasco Laret Suiter & Associates
Company
5/31 /16
Date
umber & Expiration Date
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Beachwalk at Roosevelt
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Beachwalk at Roosevelt
C cityof
Carlsbad
STORM WATER STANDARDS
QUESTIONNAIRE
Development Services
Land Development Engineering
1635 Faraday Avenue
(760) 602-2750
www.carlsbadca.gov
E-34
I INSTRUCTIONS:
To address post-development pollutants that may be generated from development projects, the city requires that new
development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management
Practices (BMPs) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual,
refer to the Engineering Standards (Volume 5).
This questionnaire must be completed by the applicant in advance of submitting for a development application
(subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of
storm water standards that must be applied to a proposed development or redevelopment project. Depending on the
outcome, your project will either be subject to 'STANDARD PROJECT' requirements or be subject to 'PRIORITY
DEVELOPMENT PROJECT' (PDP) requirements.
Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City
staff has responsibility for making the final assessment after submission of the development application. If staff
determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than
initially assessed by you, this will result in the return of the development application as incomplete. In this case, please
make the changes to the questionnaire and resubmit to the city.
If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the
questions, please seek assistance from Land Development Engineering staff.
A completed and signed questionnaire must be submitted with each development project application. Only one
completed and signed questionnaire is required when multiple development applications for the same project are
submitted concurrently.
PROJECT INFORMATION
PROJECT NAME: Beachwalk at Roosevelt PROJECT ID: CT 14-07 I RP 14-20
ADDRESS: 2685, 2687 & 2715 Roosevelt Street APN: 203-101-02 & 203-101-05
The project is (check one): D New Development Ill Redevelopment
The total proposed disturbed area is: 35,390 ft2 ( 0.81 ) acres
The total proposed newly created and/or replaced impervious area is: 21 ,707 ft2 ( 0.50 ) acres
If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the
SWQMP # of the larger development project:
Project ID SWQMP#:
Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your
application to the city.
E-34 Page 1 of 4 REV 02/16
STEP 1
TO BE COMPLETED FOR ALL PROJECTS
To determine if your project is a "development project", please answer the following question: YES NO
Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building
or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)? □ [ZJ
If you answered "yes" to the above question, provide justification below then go to Step 5, mark the third box stating "my
project is not a 'development project' and not subject to the requirements of the BMP manual" and complete applicant
information.
Justification/discussion: (e.g. the project includes only interior remodels within an existing building):
If you answered "no" to the above auestion, the project is a 'development project', go to Step 2.
STEP2
TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS
To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provision E.3.b.(3), please answer
the following questions:
Is your project LIMITED to one or more of the following:
YES NO
1. Constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria:
a) Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non-
erodible permeable areas; □ [ZJ
b) Designed and constructed to be hydraulically disconnected from paved streets or roads;
c) Designed and constructed with permeable pavements or surfaces in accordance with USEPA
Green Streets auidance?
2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in
accordance with the USEPA Green Streets guidance? □ [ZJ
3. Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual? □ [ZJ
If you answered "yes" to one or more of the above questions, provide discussion/justification below, then go to Step 5, mark
the second box stating "my project is EXEMPT from PDP ... " and complete applicant information.
Discussion to justify exemption ( e.g. the project redeveloping existing road designed and constructed in accordance with
the USEPA Green Street guidance):
If vou answered "no" to the above auestions, vour project is not exemot from PDP, ao to Step 3.
E-34 Page 2 of 4 REV 02/16
STEP3
TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS
To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1 )):
YES NO
1. Is your project a new development that creates 10,000 square feet or more of impervious surfaces
collectively over the entire project site? This includes commercial, industrial, residential, mixed-use, □ IZl
and public development projects on public or private land.
2. Is your project a redevelopment project creating and/or replacing 5,000 square feet or more of
impervious surface collectively over the entire project site on an existing site of 10,000 square feet or IZl □ more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public
development projects on public or private land.
3. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more
of impervious surface collectively over the entire project site and supports a restaurant? A restaurant is
a facility that sells prepared foods and drinks for consumption, including stationary lunch counters and □ IZl
refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial
Classification (SIC) code 5812).
4. Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious
surface collectively over the entire project site and supports a hillside development project? A hillside □ [l]
development project includes development on any natural slope that is twenty-five percent or greater.
5. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more
of impervious surface collectively over the entire project site and supports a parking lot? A parking lot is □ [l] a land area or facility for the temporary parking or storage of motor vehicles used personally for
business or for commerce.
6. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more
of impervious surface collectively over the entire project site and supports a street, road, highway □ IZl freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface
used for the transportation of automobiles, trucks, motorcycles, and other vehicles.
7. Is your project a new or redevelopment project that creates and/or replaces 2,500 square feet or more
of impervious surface collectively over the entire site, and discharges directly to an Environmentally
Sensitive Area (ESA)? "Discharging Directly to" includes flow that is conveyed overland a distance of □ [l]
200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an
isolated flow from the project to the ESA (i.e. not commingled with flows from adjacent lands).*
8. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square
feet or more of impervious surface that supports an automotive repair shop? An automotive repair □ [l] shop is a facility that is categorized in any one of the following Standard Industrial Classification (SIC)
codes: 5013, 5014, 5541, 7532-7534, or 7536-7539.
9. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square
feet or more of impervious area that supports a retail gasoline outlet (RGO)? This category includes □ [l] RGO's that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily
Traffic (ADT) of 100 or more vehicles per day.
10. Is your project a new or redevelopment project that results in the disturbance of one or more acres of land □ [l] and are expected to generate pollutants post construction?
11. Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of
impervious surface or (2) increases impervious surface on the property by more than 10%? (CMC □ [l]
21 .203.040)
If you answered "yes" to one or more of the above questions, your project is a PDP. If your project is a redevelopment
project, go to step 4. If your project is a new project, go to step 5, check the first box stating "My project is a PDP ... "
and complete applicant information.
If you answered "no" to all of the above questions, your project is a 'STANDARD PROJECT.' Go to step 5, check the
second box stating "My project is a 'STANDARD PROJECT' ... " and complete applicant information.
E-34 Page 3 of 4 REV 02/16
STEP4
TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP)
ONLY
Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3.b.(2)):
YES NO
Does the redevelopment project result in the creation or replacement of impervious surface in an amount
of less than 50% of the surface area of the previously existing development? Complete the percent
impervious calculation below:
Existing impervious area (A)= 16·376 sq. ft. □ Ill
Total proposed newly created or replaced impervious area (B) = 21 ,707 sq. ft.
Percent impervious area created or replaced (B/A)*100 = 132·6 %
If you answered "yes", the structural BMPs required for PDP apply only to the creation or replacement of impervious
surface and not the entire development. Go to step 5, check the first box stating "My project is a PDP ... " and complete
applicant information.
If you answered "no," the structural BM P's required for PDP apply to the entire development. Go to step 5, check the
check the first box statin~ "My project is a PDP ... " and complete aoolicant information.
STEP 5
CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION
Ill My project is a PDP and must comply with PDP stormwater requirements of the BMP Manual. I understand I must
prepare a Storm Water Quality Management Plan (SWQMP) for submittal at time of application.
0 My project is a 'STANDARD PROJECT' OR EXEMPT from PDP and must only comply with 'STANDARD PROJECT'
stormwater requirements of the BMP Manual. As part of these requirements, I will submit a "Standard Project
Requirement Checklist Form E-3G" and incorporate low impact development strategies throughout my project.
Note: For projects that are close to meeting the PDP threshold, staff may require detailed impervious area calculations
and exhibits to verify if 'STANDARD PROJECT' stormwater requirements apply.
D My Project is NOT a 'development project' and is not subject to the requirements of the BMP Manual.
Applicant Information and Signature Box
Applicant Name: Tara Goldberg Applicant Title: Project Engineer
Applicant Signature: ~ <W¾ Date: 5-27-16
.. • Environmentally Sens1hve Areas include but are not limited to all Clean Water Act Section 303(d) 1mpa1red water bodies; areas designated as Areas of Special
Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies
designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and
amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and County of San Diego; Habitat
Management Plan; and any other equivalent environmentally sensitive areas which have been identified by the City.
This Box for Citv Use Only
YES NO
City Concurrence: □ □
By:
Date:
Project ID:
E-34 Page 4 of 4 REV 02/16
SITE INFORMATION CHECKLIST
ProJect Summarv Information
Project Name Beachwalk at Roosevelt
Project ID CT 14-07 I RP 14-20
Project Address 2685, 2687 & 2715 Roosevelt Street
Assessor's Parcel Number(s) (APN(s)) 203-101-02 & 203-101-05
Project Watershed (Hydrologic Unit) Carlsbad 904
Parcel Area 0.67 Acres ( 29 160 Sauare Feet)
Existing Impervious Area
(subset of Parcel Area) 0.24 Acres ( 10,608 Square Feet)
Area to be disturbed by the project Acres (Project Area) ~ ( 35,390 Square Feet)
Project Proposed Impervious Area Acres (subset of Proiect Area) 0.50 ( 21,707 Square Feet)
Project Proposed Pervious Area
(subset of Project Area) 0.31 Acres ( 13,683 Square Feet)
Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the
Project.
This may be less than the Parcel Area.
Beachwalk at Roosevelt
Description of Exlstlna Site Condition and Dralnaae Patterns
Current Status of the Site (select all that apply):
0 Existing development
□ Previously graded but not built out
□ Agricultural or other non-impervious use
□ Vacant, undeveloped/natural
Description/ Additional Information:
In the existing condition, the project site consists of 4 residential buildings, associated
hardscape and accessory buildings, and vegetated and non-vegetated areas.
Existing Land Cover Includes (select all that apply):
0 Vegetative Cover
□ Non-Vegetated Pervious Areas
0 Impervious Areas
Description / Additional Information:
Underlying Soil belongs to Hydrologic Soil Group (select all that apply):
D NRCS Type A
@NRCS Type B
D NRCS Type C
D NRCS Type D
Approximate Depth to Groundwater (GW):
o GW Depth < 5 feet
□ 5 feet < GW Depth < 1 0 feet
□ 1 0 feet < GW Depth < 20 feet
0 GW Depth > 20 feet
Existing Natural Hydrologic Features (select all that apply):
□ Watercourses
□ Seeps
□ Springs
□ Wetlands
@None
Description / Additional Information:
Beachwalk at Roosevelt
Description of Existing Site Topography and Drainage [How is storm water runoff conveyed from
the site? At a minimum, this description should answer (1) whether existing drainage
conveyance is natural or urban ; (2) describe existing constructed storm water conveyance
systems, if applicable; and (3) is runoff from offsite conveyed through the site? if so, describe]:
In the existing condition, the project site consists of 4 residential buildings, associated
hardscape and accessory buildings, and vegetated and non-vegetated areas.
The existing topography varies with elevations ranging from approximately 42.1 feet at the high
point at the southeast portion of the site, to approximately 39.0 feet at the western portion of the
site. Storm water runoff flows away from the existing buildings and flows southwest overland
onto the adjacent property. Runoff continues to State Street where it is collected in existing
storm drain which flows north and ultimately discharges to Buena Vista Lagoon.
Beachwalk at Roosevelt
Description of Prooosed Site Development and Dralnaae Patterns
Project Description / Proposed Land Use and/or Activities:
The project proposes to construct 16 condominium units, associated landscaping and
hardscape improvements, and LID components including permeable paver driveways and
bioretention storm water BMPs designed to provide pollutant control.
List/describe proposed impervious features of the project (e.g., buildings, roadways, parking
lots, courtyards, athletic courts, other impervious features):
16 condominium units, PCC walkways, and portions of the proposed driveways have strips of
PCC.
List/describe proposed pervious features of the project (e.g., landscape areas):
Proposed pervious features onsite include permeable paver driveways, landscape, and
bioretention areas. Per direction from the City of Carlsbad, pervious gutter is proposed in the
ROW to treat roadway runoff.
Does the project include grading and changes to site topography?
@Yes
□No
Description / Additional Information:
The proposed site will drain from west to east toward Roosevelt Street.
Does the project include changes to site drainage (e.g ., installation of new storm water
conveyance systems)?
@Yes
□No
Description / Additional Information:
The proposed site changes the direction of the existing condition drainage flowing from west to
east toward Roosevelt Street, from approximately 42.5 feet along the western property line to
approximately 41.2 feet at the northeasterly corner of the site. In the proposed condition, runoff
is diverted away from buildings and flows overland to proposed bioretention areas in the
northeastern portion of the site. The treated storm water will be conveyed from the bioretention
areas in drainage pipes that connect to the existing storm drain system in Roosevelt Street
which discharges north to Buena Vista Lagoon.
Beachwalk at Roosevelt
Identify whether any of the following features, activities, and/or pollutant source areas will be
present (select all that apply):
0 On-site storm drain inlets
□ Interior floor drains and elevator shaft sump pumps
0 Interior parking garages
0 Need for future indoor & structural pest control
0 Landscape/Outdoor Pesticide Use
□ Pools, spas, ponds, decorative fountains, and other water features
D Food service
0 Refuse areas
□ Industrial processes
D Outdoor storage of equipment or materials
□ Vehicle and Equipment Cleaning
□ Vehicle/Equipment Repair and Maintenance
□ Fuel Dispensing Areas
□ Loading Docks
0 Fire Sprinkler Test Water
0 Miscellaneous Drain or Wash Water
0 Plazas, sidewalks, and parking lots
Beachwalk at Roosevelt
Identification of Recelvlna Water Pollutants of Concern
Describe path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or
reservoir, as applicable):
In the proposed condition, storm water runoff from the project site is conveyed in proposed
storm drain that connects to existing storm drain located in Roosevelt Street which flows
northerly and discharges to Buena Vista Lagoon.
List any 303(d) impaired water bodies within the path of storm water from the project site to the
Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable), identify the
pollutant(s)/stressor(s) causing impairment, and identify any TMDLs for the impaired water
bodies:
303(d) Impaired Water Body Pollutant(s)/Stressor(s) TMDLs
Buena Vista Creek Sediment Toxicity TMDL
Buena Vista Creek Selenium TMDL
Buena Vista Lagoon Indicator Bacteria TMDL
Buena Vista Lagoon Nutrients TMDL
Buena Vista Lagoon Sedimentation/Siltation TMDL
Identification of ProJect Site Pollutants
Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see
BMP DesiQn Manual Appendix 8.6):
Also a Receiving
Not Applicable to Anticipated from the Water Pollutant of
Pollutant the Project Site Project Site Concern
Sediment X X
Nutrients X X
Heavy Metals X
OrQanic Compounds X
Trash & Debris X
Oxygen Demanding
Substances X
Oil & Grease X
Bacteria & Viruses X X
Pesticides X
Beachwalk at Roosevelt
Do hydromodification management requirements apply (see Section 1.6 of the BMP Design
Manual)?
□Yes, hydromodification management flow control structural BMPs required.
□No, the project will discharge runoff directly to existing underground storm drains discharging
directly to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean.
0 No, the project will discharge runoff directly to conveyance channels whose bed and bank
are concrete-lined all the way from the point of discharge to water storage reservoirs, lakes,
enclosed embayments, or the Pacific Ocean.
□ No, the project will discharge runoff directly to an area identified as appropriate for an
exemption by the WMAA for the watershed in which the project resides.
Description / Additional Information (to be provided if a 'No' answer has been selected above):
Storm water runoff from the project flows to Roosevelt Street, enters existing storm drain at the
frontage of the site, and ultimately discharges to Buena Vista Lagoon. Based on Figure 1-2 of
the Carlsbad BMP Design Manual, the project directly discharges to an area identified in the
WMAA, Buena Vista Lagoon. Pursuant to the study approved by the City of Carlsbad titled
"Hydromodification Exemption Analyses for Select Carlsbad Watersheds" dated September 17,
2015 prepared by Chang Consultants, the hydrologic and hydraulic analyses performed showed
that the hardened systems draining to the lagoon conveyed the 1 0-year storm event, the
discharge points have proper energy dissipation and the outlets are within the 100-year flood
limits. The study concluded and recommended that the Buena Vista Lagoon be exempt from
hydromodification management requirements.
11111s Section onl ulrements a
Beachwalk at Roosevelt
Based on the maps provided within the WMAA, do potential critical coarse sediment yield areas
exist within the project drainage boundaries?
□Yes
0 No, No critical coarse sediment yield areas to be protected based on WMAA maps
If yes, have any of the optional analyses presented in Section 6.2 of the BMP Design Manual
been performed?
o 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite
o 6.2.2 Downstream Systems Sensitivity to Coarse Sediment
o 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite
D No optional analyses performed, the project will avoid critical coarse sediment yield areas
identified based on WMAA maps
If optional analyses were performed, what is the final result?
o No critical coarse sediment yield areas to be protected based on verification of GLUs onsite
D Critical coarse sediment yield areas exist but additional analysis has determined that
protection is not required. Documentation attached in Attachment 8 of the SWQMP.
o Critical coarse sediment yield areas exist and require protection. The project will implement
management measures described in Sections 6.2.4 and 6.2.5 as applicable, and the areas
are identified on the SWQMP Exhibit.
Discussion / Additional Information:
N/A
Beachwalk at Roosevelt
Flow Control for Post-Project Runoff*
*This Section onlv reaulred If hvdromodlflcatlon management requirements aDDIY
List and describe point(s) of compliance (POCs) for flow control for hydromodification
management (see Section 6.3.1 ). For each POC, provide a POC identification name or number
correlating to the project's HMP Exhibit and a receiving channel identification name or number
correlating to the project's HMP Exhibit.
Has a geomorphic assessment been performed for the receiving channel(s)?
0 No, the low flow threshold is 0.102 (default low flow threshold)
□ Yes, the result is the low flow threshold is 0.102
D Yes, the result is the low flow threshold is 0.302
□ Yes, the result is the low flow threshold is 0.502
If a geomorphic assessment has been performed, provide title, date, and preparer:
Discussion / Additional Information: (optional)
N/A
Beachwalk at Roosevelt
Other Site Reaulrements and Constraints
When applicable, list other site requirements or constraints that will influence storm water
management design, such as zoning requirements including setbacks and open space, or City
codes governing minimum street width, sidewalk construction, allowable pavement types, and
drainage requirements.
Driveway areas have been designed to meet the minimum widths and are mostly permeable
paver areas. Landscaping areas are incorporated into the plans. The landscaping will consist of
both native and non-native plants. The goal is to achieve plant establishment expeditiously to
reduce erosion. The irrigation system for these landscaped areas will be monitored to reduce
over irrigation. Lawn areas, natural vegetation and bioretention areas are proposed to reduce
runoff and maximize infiltration. Per direction from the City of Carlsbad, pervious gutter is
proposed in the ROW to treat roadway runoff.
Ootlonal Addltlonal Information or Continuation of Previous Sections As Needed
This space provided for additional information or continuation of information from previous
sections as needed.
Beachwalk at Roosevelt
C cityof
Carlsbad
STANDARD PROJECT
REQUIREMENT
CHECKLIST
E-36
Project Information
Project Name: Beachwalk at Roosevelt
Project ID: CT 14-07 I RP 14-20
DWG No. or Building Permit No.: 490-6A
Source Control BMPs
Development Services
Land Development Engineering
1635 Faraday Avenue
(760) 602-2750
www.carlsbadca.gov
All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See
Chapter 4 and Appendix E.1 of the BMP Design Manual for information to implement source control BMPs shown in this
checklist.
Answer each category below pursuant to the following.
• "Yes" means the project will implement the source control BMP as described in Chapter 4 and/or Appendix E.1 of the
Model BMP Design Manual. Discussion/justification is not required .
• "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be
provided. Please add attachments if more space is needed.
• "N/A" means the BMP is not applicable at the project site because the project does not include the feature that is
addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion/justification may be
provided.
Source Control Requirement Applied?
SC-1 Prevention of Illicit Discharges into the MS4 ~ Yes 0 No 0 N/A
Discussion/justification if SC-1 not implemented:
SC-2 Storm Drain Stenciling or Signage ~ Yes 0 No 0 N/A
Discussion/justification if SC-2 not implemented:
SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind □ Yes 0 No Ill N/A Dispersal
Discussion/justification if SC-3 not implemented:
E-36 Page 1 of 4 Revised 03/16
Source Control Requirement (continued) Aoolled?
SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and D Yes D No Ill N/A Wind Dispersal
Discussion/justification if SC-4 not implemented:
SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal Ill Yes D No D N/A
Discussion/justification if SC-5 not implemented:
SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and
identify additional BMPs. (See Table in Aooendix E.1 of BMP Manual for quidance).
Ill On-site storm drain inlets Ill Yes D No D N/A
D Interior floor drains and elevator shaft sump pumps □ Yes D No Ill N/A
Ill Interior parking garages Ill Yes D No D N/A
Ill Need for future indoor & structural pest control i;zJYes D No D N/A
Ill Landscape/Outdoor Pesticide Use i;zJYes D No D N/A
D Pools, spas, ponds, decorative fountains, and other water features □ Yes D No Ill N/A
D Food service □ Yes D No Ill N/A
'21 Refuse areas i;zJYes D No D N/A
D Industrial processes D Yes D No Ill N/A
□ Outdoor storage of equipment or materials D Yes D No Ill N/A
D Vehicle and Equipment Cleaning D Yes D No '21 N/A
□ Vehicle/Equipment Repair and Maintenance D Yes D No Ill N/A
D Fuel Dispensing Areas D Yes D No Ill N/A
D Loading Docks D Yes D No Ill N/A
Ill Fire Sprinkler Test Water i;zJYes O No D N/A
Ill Miscellaneous Drain or Wash Water i;zJYes 0 No 0 N/A
Ill Plazas, sidewalks, and parkinq lots Ill Yes 0 No 0 N/A
For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers.
Mark existing curb inlet on frontage with "No Dumping! Flows to Lagoon" or similar.
If interior parking garage floor drains are proposed by architect, they will be plumbed to sanitary sewer.
Provide Integrated Paste Management information to owners, lessees and operators.
Landscaping to be designed to minimize irrigation and runoff and to promote surface infiltration where appropriate.
Bioretention basins proposed to retain and treat stormwater.
Proposed trash cans will be stored in interior garages.
Fire sprinkler test water to drain to sanitary sewer.
Condensate drain lines. roof downspouts, etc. to discharge to landscape areas.
Plazas, sidewalks and driveways to be swept regularily
E-36 Page 2 of 4 Revised 03/16
Site Design BMPs
All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See
Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual for information to implement site design BMPs shown in
this checklist.
Answer each category below pursuant to the following.
• "Yes" means the project will implement the site design BMPs as described in Chapter 4 and/or Appendix E.2 thru E.6 of
the Model BMP Design Manual. Discussion / justification is not required.
• "No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be
provided. Please add attachments if more space is needed.
• "N/A" means the BMPs is not applicable at the project site because the project does not include the feature that is
addressed by the BMPs (e.g., the project site has no existing natural areas to conserve). Discussion/justification may be
provided.
Source Control Requirement I Applied?
SD-1 Maintain Natural Drainaqe Pathways and Hvdrologic Features I D Yes I □ No I '21 N/A
Discussion/justification if SD-1 not implemented:
SD-2 Conserve Natural Areas, Soils, and Vegetation I □Yes I □ No I '21 N/A
Discussion/justification if SD-2 not implemented:
SD-3 Minimize Impervious Area I '21 Yes I 0 No ID N/A
Discussion/justification if SD-3 not implemented:
SD-4 Minimize Soil Compaction I '21 Yes I 0 No I D NIA
Discussion/justification if SD-4 not implemented:
SD-5 Impervious Area Dispersion I '21 Yes I 0 No ID N/A
Discussion/justification if SD-5 not implemented:
E-36 Page 3 of 4 Revised 03/16
Source Control Requirement (continued) I Applied?
SD-6 Runoff Collection I Ill Yes I D No I D N/A
Discussion/justification if SD-6 not implemented:
SD-7 Landscaping with Native or Drought Tolerant Species I Ill Yes I □ No ID N/A
Discussion/justification if SD-7 not implemented:
SD-8 Harvestinq and Usinq Precipitation I D Yes I 0 No I Ill N/A
Discussion/justification if SD-8 not implemented:
E-36 Page 4 of 4 Revised 03/16
SUMMARY OF PDP STRUCTURAL BMPS
PDP Structural BMPs
All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of
the BMP Design Manual). Selection of PDP structural BMPs for storm water pollutant control
must be based on the selection process described in Chapter 5. PDPs subject to
hydromodification management requirements must also implement structural BMPs for flow
control for hydromodification management (see Chapter 6 of the BMP Design Manual). Both
storm water pollutant control and flow control for hydromodification management can be
achieved within the same structural BMP(s).
PDP structural BMPs must be verified by the City at the completion of construction. This may
include requiring the project owner or project owner's representative to certify construction of
the structural BMPs (see Section 1.12 of the BMP Design Manual). PDP structural BMPs must
be maintained into perpetuity, and the City must confirm the maintenance (see Section 7 of the
BMP Design Manual).
Use this form to provide narrative description of the general strategy for structural BMP
implementation at the project site in the box below. Then complete the PDP structural BMP
summary information sheet for each structural BMP within the project (copy the BMP summary
information page as many times as needed to provide summary information for each individual
structural BMP).
Describe the general strategy for structural BMP implementation at the site. This information
must describe how the steps for selecting and designing storm water pollutant control BMPs
presented in Section 5.1 of the BMP Design Manual were followed, and the results (type of
BMPs selected). For projects requiring hydromodification flow control BMPs, indicate whether
pollutant control and flow control BMPs are integrated together or separate.
Step 1 A: The OMA is not self-mitigating, de minimus, or self-retaining.
Step 1 B: There are no site design BMPs proposed for the project for which the runoff factor can
be adjusted.
Step 2: Harvest and use is not applicable.
Step 3: Infiltration is feasible and is therefore the BMP chosen for the project site for pollutant
control.
Step 3A&B: The BMP is proposed for the Full Infiltration Condition.
Step 3C : The sizing requirement calculations are located in Attachment 1 e.
Step 4: The BMP is designed to treat the full DCV.
Step 4A: Design BMP for the required size, per design criteria and considerations listed in the
fact sheets. Refer to Attachment 1 e for calculations.
[Continue on next page as necessary.]
Beachwalk at Roosevelt
[Continued from previous page -This page is reserved for continuation of description of general
strategy for structural BMP implementation at the site.]
Beachwalk at Roosevelt
Structural BMP Summary Information
[Copy this page as needed to provide Information for each lndlvldual proposed
structural BMPJ
Structural BMP ID No. BMP-A & 8
DWG 490-6A Sheet No. 2 & 3
Type of structural BMP:
D Retention by harvest and use (HU-1)
0 Retention by infiltration basin (INF-1)
D Retention by bioretention (INF-2)
D Retention by permeable pavement (INF-3)
D Partial retention by biofiltration with partial retention (PR-1)
D Biofiltration (BF-1)
D Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or
biofiltration BMP (provide BMP type/description and indicate which onsite retention or
biofiltration BMP it serves in discussion section below)
□ Detention pond or vault for hydromodification management
□ Other (describe in discussion section below)
Purpose:
0 Pollutant control only
□ Hydromodification control only
o Combined pollutant control and hydromodification control
D Pre-treatment/forebay for another structural BMP
□ Other (describe in discussion section below)
Discussion (as needed):
Beachwalk at Roosevelt
ATTACHMENT 1
BACKUPFORPDPPOLLUTANTCONTROLBMPS
This is the cover sheet for Attachment 1.
Check which Items are Included behind this cover sheet:
Attachment Contents Checklist
Seauence
Attachment 1 a OMA Exhibit (Required)
Attachment 1 b
Attachment 1 c
Attachment 1 d
See OMA Exhibit Checklist on the
back of this Attachment cover sheet.
(24"x36" Exhibit typically required)
Tabular Summary of DMAs Showing
OMA ID matching OMA Exhibit, OMA
Area, and OMA Type (Required)*
*Provide table in this Attachment OR
on OMA Exhibit in Attachment 1 a
Form 1-7, Harvest and Use Feasibility
Screening Checklist (Required unless
the entire project will use infiltration
BMPs)
Refer to Appendix B.3-1 of the BMP
Design Manual to complete Form 1-7.
Form 1-8, Categorization of Infiltration
Feasibility Condition (Required
unless the project will use harvest and
use BMPs)
Ref er to Appendices C and D of the
BMP Design Manual to complete
Form 1-8.
0 Included
0 Included on OMA Exhibit in
Attachment 1 a
o Included as Attachment 1 b,
separate from OMA Exhibit
D Included
0 Not included because the entire
project will use infiltration BMPs
@ Included
o Not included because the entire
project will use harvest and use
BMPs
Attachment 1 e Pollutant Control BMP Design 0 Included
Worksheets / Calculations (Required)
Refer to Appendices B and E of the
BMP Design Manual for structural
pollutant control BMP design
guidelines
Beachwalk at Roosevelt
Use this checklist to ensure the required information has been included on the OMA
Exhibit:
The OMA Exhibit must identify:
□ Underlying hydrologic soil group
□ Approximate depth to groundwater
□ Existing natural hydrologic features (watercourses, seeps, springs, wetlands)
□ Critical coarse sediment yield areas to be protected (if present)
□ Existing topography and impervious areas
D Existing and proposed site drainage network and connections to drainage offsite
□ Proposed grading
□ Proposed impervious features
D Proposed design features and surface treatments used to minimize imperviousness
D Drainage management area (OMA) boundaries, OMA ID numbers, and OMA areas (square
footage or acreage), and OMA type (i.e., drains to BMP, self-retaining, or self-mitigating)
□ Structural BMPs (identify location and type of BMP)
Beachwalk at Roosevelt
Attachment 1 a/1 b
Beachwalk at Roosevelt
--· ---·---,---------------.. ··-···········.,----i --'-------···----
' '
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PLAN VlEW-DMA, BMP, LID EXHIBIT
SCALE: :l."=iO'
GRAPHIC SCALE 1"=10"
•
10 20 30
-_
--
--
-"' ' ' [.'..._ __ ~;
--
BMP A, BIORETENTION BASINS
SOIL
BMP B, BIORETENTION BASINS
SOIL
DMA DMA DMA RF • TYPE DMA DMA DMA RF • TYPE
B l NAME AREA PPST RF AREA B I NAME AREA PPST RF AREA
Al l"l3 BLDG O.Cf ll4 Bl 62Cf BLDG o_q 566
A2 l84 BLDG O,Cf l06 B2 OOCf BLDG O.Cf 128
AB i<!B BLDG O.'l ll4 BB BO<! BLD6 o_Cf 12B
A4 l'!5 BLDG O.Cf ll6 B4 1'1S BLD6 0.'1 114
A5 825 BLDG O.Cf i4B B5 184 BLDG 0.'1 106
A6 62<! BLDG O.Cf 566 B6 1'1:3 BLDG 0.'1 ll4
Al 80<! BLDG O.Cf l28 B1 1<!5 BLDG 0.'1 116
AB BOC! BLDG O.Cf 12B 138 B25 BLDG O.Cf 14B
AC! 424 pp O.I 42 BC{ 426 pp OJ 4S
AIO Cf1 PC.C. O,Cf 81 BIO Ill PC.C. O.Cf 100
All B21 pp O.I B2 BIi B20 pp 0.1 S2
Al2 112 PC.C. O,'! IOI Bl2 115 PC.C. 0.'1 104
AIB B16 pp OJ B8 BIB S8B pp OJ 50
Al4 IOCf PC.C. O.'! Cf8 614 115 PC.C. 0.'1 104
Al5 2'!2 pp 0.1 2Cf Bl5 S54 pp OJ B5
Al6 C{C{ PC.C. O.Cf 8'! Bl6 108 pe,c, O.Cf <ii
All 15Cf pp O.I 16 Bil 654 pp OJ b5
Al8 200 PC.C. O.Cf 100 Bl8 Cf5 PC.C. O,Cf 86
Al'! 488 pp 0.1 -¥1 Bl<! 451 pp OJ 45
A20 106 PC.C. O,Cf Cf5 B20 106 PGG O.Cf '15
A21 BBC! pp 0.1 S4 B21 S50 pp OJ S5
A22 80 PC.C. O.Cf 12 B22 00 PGG O.Cf 12
A2B 166 pp O.I 11 B2:3 166 pp 0.1 11
A24 160<! L O,S 48B B24 1664 L O.B 4'1Cf
A25 l8 L O.B 2B B25 10 L 0.;3 ;3
A26 12 L O.B 4 B2b 12 L 0.:3 4
A21 4S L O.B IS 621 12 L 0.:3 4
A28 12 L o.B 4 B28 ICfO L O.B 5l
A2'1 '1 L O.S s B2Cf 2B L O.B l
l'-30 lef<i L O.S 60 BSO Cf2 pe,c, 0.'1 8S
ABI 2S L O.B 1 BSI B2 L O.B 25
AB2 Cf8 PC.C. O.Cf 8B BS2 85 L O.B 26
AB:3 '!4 L O.B 28 BBS 4S L O.B 1:3
A:34 1SI PC.C. O,Cf 65B BS4 2SO L 0.:3 6'1
AB5 B2Cf L O.B C{C{ BS5 2?5 L O.B 68
A:36 404 L O.S 121 BSb 10 L 0.:3 B
/'-31 21<! L o.B 66
AS8 10 L O.B ;3
BSl 605 pe,c, 0,'1 545
BS8 28 PC.C. O.Cf 25
A3Cf 402 L O,B 121 BBC! 601 L O.B 182
A40 28 PC.C. O,'! 25 B40 540 L O.B 162
A41 66 PC.C. O,'! 5Cf B41 bb PGC. O,Cf 5Cf
A42 4B L O.B IB TOTAL 8,411
TOTAL 8,412
PROPOSED IMPERVIOUS AREA = B,412 SF
MIN TI<EATMENT AREA
PROPOSED IMPERVIOUS AREA = B,411 SF
MIN TREATMENT AREA
= B,411 • O.OS
= 8,4l2 * O.OS = 25S SF
= 254 SF
6" PVC C11AIN PJPEf \ I . / \ ·
CCHIECTION, '!.,JI, ~If( I / ' I LENGTH PERr~i 1 \ ; ;\ 1
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* Bia:ETENrION "ENGil'EEFEIJ SOIL " LA YER 5HALL BE MINIMU'4 iB" DEEP
"SANJY LOAM" SOIL MIX WITH NO MORE 7HAN 5% a.A Y W/TENT, 11-E MIX
fi-lALL crJl,ff AJN 50-60% SAND, 20-30% caMPOST OR HARIJWOORD l«LCH, AMJ
20-30% TOPSOIL. FREE !JF ST0/1£5, STUMPS, FlJOTS, OR SIMILAR CJBJECT5,
AMJ ALSO FREE !JF NOXIOUS I/EEDS.
"* 3/ 4" CRJ5HED ROa< LA YER 5HALL BE A MINJMM !JF 6" BUT MAY BE
DEEPENED TO INCREASE Tl£ INFIL 1RATIDN AMJ STORAGE ABILITY !JF Tl£
DITAIL
**H PER GEOTECHIICAL REPORT, WALLS !JF BASIN ALONG STRUCTLRE SIDE
SHALL BE LINED WITH AN 114"EF1£ABL£ MEMBRANE TO LIMIT NE/JR
SlHACE IHFIL TRA TION _
BIORETENTION LANDSCAPE BMP
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HYDROLOGIC NODE MAP
ROOSEVELT STREET
PRE-DEVELOPMENT MAP
•C" CALCULATIONS
C= (%IMPERVIOUS x 0.87) + [ (1-%IJ.FERVIOUS)x0.41)
SUB-AREA 'A 1 '
C= (0 .87x0 .87) + (0.13x0.41)
C=0.81
SUB-AREA 'A2 '
C= (0.79x0.87) + (0.21.x0.41)
c-o.77
SUB-AREA 81 '
C= (0 .64x0 .87) + (0.36x0.41)
C=0.70
SUB-AREA B2'
C= (0 .35x0 .87) + (0.65x0.41)
C=0.57
SCALE: 1 •=201
OOTLET 2 2 I' \
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HYDROLOGIC NODE MAP
ROOSEVELT STREET
ta:E1.1
EL.=39.0
-
A1•1,726 SF=0.04 AC
C-0.63
LEGEND
BASIN BCX.WARY
POS~DEVELOPMENTMAP
•c• CALCULATIONS
C= (%IJ.FERVIOUS x 0.87) + [(1-%IJ.FERVIOUS)x0.41)
SUB-AREA 'Aj '
C= (0ABx0.87) + (0.52x0.41)
C=0.63
SUB-AREA 'A2'
C= (0.62x0.87J + (0.3Bx0.41)
C=0.70
~
SCALE: 1 "=20'
SLB-AREA BCX.HJARY ---
FLOM..I/IE
D4'ERVIOU5 AREA .._ __ ___, 21.707 SF= (15.764 SF ONSITEJ+ (5,943 SF OFFSITE)
Attachment 1 c
N/A
Beachwalk at Roosevelt
Attachment 1 d
Form 1-8 hereafter provided by project Geotechnical Engineer, Geotek Inc. Refer
to project Geotechnical report for further information.
Beachwalk at Roosevelt
Appendix I: Forms and Checklists
Categorization of Infiltration Feasibility Form 1-8
Condition
Part 1 -Full Infiltration Feasibility Screening Criteria
Would infiltration of the full design volume be feasible from a physical perspective without any undesirable
consequences that cannot be reasonably mitigated?
Criteria Screening Question
Is the estimated reliable infiltration rate below proposed
facility locations greater than 0.5 inches per hour? The response
to this Screening Question shall be based on a comprehensive
evaluation of the factors presented in Appendi" C.2 and Appendix
D.
Provide basis:
Yes No
□
Pursuant to the letter report dated February 27, 2016 prepared by Geotek, Inc.
which summarized the results of their infiltration analysis for the project, a
percolation test was performed which showed an infiltration rate of 1.7 in/hr. Refer
to the letter report for more details.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability.
2
Can infiltration greater than 0.5 inches per hour be allowed
without increasing risk of geotechnical hazards (slope stability,
groundwater mounding, utilities, or other factors) that cannot
be mitigated to an acceptable level? The response to this
Screening Question shall be based on a comprehensive evaluation of
the factors presented in Appendix C.2.
Provide basis:
□
The site is underlain by paralic deposits (GeoTek, 2014) which is generally dense granular material and are not
subject to the following: Hydro collapse and calcareous soils; Expansive soils; Frost heave (due to climate);
Consolidation; and Liquefaction. There are no nearby slopes to consider for stability issues. The groundwater
depth in the downtown Carlsbad area can vary although depths on the order of 30 feet are typical. Groundwater
mounding could potentially occur for brief periods however this would be a localize issue an and quickly
dissipate due to the generally high permeablility of the paralic deposits. The water potential could enter Utility
trench backfills however it should quickly disapate. No long term concerns are anticipated. Locally deepened
foundations are appropriate based on proximity of foundatiojns and basin.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability.
1-3 February 2016
Appendix I: Forms and Checklists
Criteri
a
3
Form 1-8 Page 2 of 4
Screening Question
Can infiltration greater than 0.5 inches per hour be allowed
without increasing risk of groundwater contamination (shallow
water table, storm water pollutants or other factors) that cannot
be mitigated to an acceptable level? The response to this
Screening Question shall be based on a comprehensive evaluation of
the factors presented in Appendix C.3.
Provide basis:
Yes No
□
The rapid infiltration rate is based on the sandy nature of the soils encounter these sandy zones are typical
within the paralic deposits although they are neither laterally nor vertically continuous due to the lensing and
layering. Much cleansing action of these basins takes place in the man made bio-filtration materials so that the
underlying paralic deposits provide secondary cleansing . The water potentially could enter Utility trench
backfills however it would be expected to dissapate rapidly. No long term concerns are anticipated. Based on
reveiw of records through the GeoTracker system there does not appear to be any active remediation either up
or down gradient that need be considered. There is no indication of seasonal groundwater within 20 feet of the
ground surface. No nearby water well records are indicated on the DWR Water Data Library
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability.
4
Can infiltration greater than 0.5 inches per hour be allowed
without causing potential water balance issues such as change
of seasonality of ephemeral streams or increased discharge of
contaminated groundwater to surface waters? The response to
this Screening Question sh all be based on a comprehensive
evaluation of the factors presented in Appendix C.3.
Provide basis:
□
There are no nearby stream or surface waters in close proximity to the site. The Pacific Ocean is the nearest
surface water is roughly 2000 feet to southwest.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability.
Part 1
Result
*
If all answers to rows 1 -4 are "Yes" a full infiltration design is potentially feasible.
The feasibility screening category is Full Infiltration
If any answer from row 1-4 is "No", infiltration may be possible to some extent but
would not generally be feasible or desirable to achieve a "full infiltration" design.
Proceed to Part 2
*To be completed using gathered site information and best profess10nal judgment constdenng the defmiuon of MEP in
the MS4 Permit. Additional testing and/ or studies may be required by the City to substantiate findings.
1-4 February 2016
Appendix I: Forms and Checklists
Form 1-8 Page 3 of 4
Part 2 -Partial Infiltration vs. No Infiltration Feasibility Screening Criteria
Would infiltration of water in any appreciable amount be physically feasible without any negative
consequences that cannot be reasonably mitigated?
Criteria
5
Screening Question
Do soil and geologic conditions allow for infiltration in any
appreciable rate or volume? The response to this Screening
Question shall be based on a comprehensive evaluation of the
factors presented in Appendix C.2 and Appendi.x D.
Provide basis:
Yes No
□ □
Swnmarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates.
6
Can Infiltration in any appreciable quantity be allowed
without increasing risk of geotechnical hazards (slope
stability, groundwater mounding, utilities, or other factors)
that cannot be mitigated to an acceptable level? The response
to this Screening Question shall be based on a comprehensive
evaluation of the factors presented in Appendix C.2.
Provide basis:
□ □
Swnmarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates.
1-5 February 2016
Appendix I: Forms and Checklists
Criteria
7
Form 1-8 Page 4 of 4
Screening Question
Can Infiltration in any appreciable quantity be allowed
without posing significant risk for groundwater related
concerns (shallow water table, storm water pollutants or other
factors)? The response to this Screening Question shall be based
on a comprehensive evaluation of the factors presented in
Appendix C.3.
Provide basis:
Yes No
□ □
Summarize findings of studies; provide reference to sn1dies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates.
8
Can infiltration be allowed without violating downstream
water rights? The response to this Screening Question shall be
based on a comprehensive evaluation of the factors presented in
Appendix C.3.
Provide basis:
□ □
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates.
Part 2
Result*
If all answers from row 5-8 are yes then partial infiltration design is potentially feasible.
The feasibility screening category is Partial Infiltration.
If any answer from row 5-8 is no, then infiltration of any volume is considered to be
infeasible within the drainage area. The feasibility screening category is No Infiltration.
*To be co1npleted ustng gathered s1te 1nformat1on and best professional Judgment cons1denng the definition of ~IEP tn
the MS4 Permit. Additional testing and/ or studies may be required by the City to substantiate findings.
I-6 February 2016
Attachment 1 e
Beachwalk at Roosevelt
2110 Roosevelt
DCV Calculations
DMA-A
Design Capture Volume Worksheet B-2.1
1 85th percentile 24-hr storm depth from FigureB.1-1 d= 0.58 inches
2 Area tributarv to BMP-A A = 0.32 acres
Area weighted runoff factor (estimate using Appendix B.1.1
3 and B.2.1) C= 0.60 unitless
4 Street trees volume reduction TCV= 0 cubic-feet
5 Rain barrels volume reduction RCV= 0 cubic-feet
Calculate DCV =
6 (3630 x C x d x A) -TCV -RCV DCV= ,1(\,1 cubic-feet
DMA-B
Design Capture Volume Worksheet B-2.1
1 85th percentile 24-hr storm depth from FigureB.1-1 d= 0.58 inches
2 Area tributary to BMP-B A= 0.34 acres
Area weighted runoff factor (estimate using Appendix B.1.1
3 and B.2.1) C= 0.58 unitless
4 Street trees volume reduction TCV= 0 cubic-feet
5 Rain barrels volume reduction RCV= 0 cubic-feet
Calculate DCV =
6 (3630 x C x d x A) -TCV -RCV D CV= 411; cubic-feet
2110 Roosevelt
Infiltration BMP Sizing
BMP-A
1 DCV D CV= 404 cubic-feet
2 Estimated desi infiltration rate 0.5 in/hr
3 Available BMP surface area AB~1r= 278 s -ft
4 Avera e effective de th in the BMP foo CV/An~11, Dav= 1.45 feet
5 Drawdown time, T D av• *12/K,ks, T= 34.8 hours
6 Provide alternative calculation of drawdown time, if needed.
BMP-B
1 DCV DCV= 415 cubic-feet
2 Estimated desi infiltration rate Kdcs, = 0.5 in/hr
3 Available BMP surface area AnMJ'= 311 s -ft
4 Avera e effective de th in the BMP foo CV /ABMP D av= 1.33 feet
5 Drawdown time, T T= 31.9 hours
6 Provide alternative calculation of drawdown time, if needed.
GeoTek, Inc.
1384 Poinsettia Avenue. Suite A Vista, CA 9208 1-8505
(760) 599-0509 (760) 599-0593 www.geotekusa.com
Vesta Pacific Development
1818 Second Avenue
San Diego, California 920 I I
Attention:
Subject:
Mr. Geoff McComic
Infiltration Evaluation
Beachwalk at Roosevelt
2685, 2687 and 2715 Roosevelt Street
Carlsbad, California
Dear Mr. McComic:
February 27, 2016
Project No. 3447-SD3
As requested and authorized, GeoTek, Inc. (GeoTek) has performed an infiltration
evaluation at the subject property. The intent of this study is to estimate the infiltration
rate in the proposed infiltration area for the project site as indicated to us by Pasco,
Laret Suitor and Associates. This report presents the results of the testing completed by
GeoTek, and provides this recommendations from a geotechnical standpoint.
The subject project is located at 2685, 2687 and 2715 Roosevelt Street in Carlsbad, California.
The subject property is occupied by several old bungalow style residential structures.
Two (2) excavations were dug by hand to a depth of about 3.5 and four (4) feet foot below
existing grade in the area of the proposed storm water basins along Roosevelt Street, as
provided to Geo T ek. Percolation tests were performed in general accordance with San Diego
County DEH procedures. A 6 inch diameter test hole was manually drilled and cleaned using an
auger, the side walls were free from smeared soils, approximately 4 inches of fine gravel was
placed in the hole, A 3 inch perforated pipe was set in the hole and fine gravel placed around
the outside of the pipe. Water was then poured into the pipe to approximately 12 inches above
the gravel. Water fell to below the top of the gravel. We continued to pour additional water in
the gravel and a total of approximately 200 were used in PI without ever maintaining a head.
Approximately 35 gallons of water were used in P2. Water drained from holes completely.
Testing was performed the following day.
VESTA PACIFIC
Infiltration Evaluation
Beachwalk at Madison, Carlsbad
Project No. 3447-SD3
February 27, 2016
Page 2
Testing (see attached) indicated a stabilized infiltration rate of approximately 3.0 gallons/hr/sf in
P2. We were unable to determine an accurate rate in PI , data suggests a rate exceeding 5 .0
gallons/hr/sf. It should be realized that rates should be expected to vary and may do so
significantly.
Over the lifetime of the storm water disposal area, the infiltration rate may be affected by silt
build up and biological activities, as well as local variations in near surface soil conditions.
LIMITATIONS
The materials observed on the project site appear to be representative of the area; however,
soil materials vary in character between excavations and natural outcrops or conditions
exposed during site construction. Site conditions may vary due to seasonal changes or other
factors. Geo T ek, Inc. assumes no responsibility or liability for work, testing or
recommendations performed or provided by others.
Our conclusions and recommendations are professional opinions that are limited to the extent
of the available data. Observations during construction are important to allow for any change
in recommendations found to be warranted. These opinions have been derived in accordance
with current standards of practice and no warranty is expressed or implied. Standards of
practice are subject to change with time.
The opportunity to be of service is sincerely appreciated. If you should have any questions,
please do not hesitate to call our office.
Respectfully submitted,
GeoTek, Inc.
Attachment: Test Data
Figure I -Infiltration Test Location Map
Distribution: (I) Addressee via email (PDF file)
GE O TE K
GEOTEK, INC.
PERCOLATION TEST DATA SHEET
TEST HOLE NO. P ----------------DEPTH OF TEST HOLE: 4 ft TEST HOLE SIZE: -----6inch ----------------S O1 L CLASSIFICATION: Light red Brown, sl moist, clean SAND (SW)
START
STOP
Time
9:20 AM
10:00 AM
TEST HOLE NO.
PRESOAK PERIOD
TIME INTERVAL
10:50 AM
9:15 AM
2/19/16
2/20/16 (no water left in test hole)
TEST PERIOD
Initial Water Final Water Time Interval (min) Level (inches) Level (inches)
AMOUNT OF WATER USED
200 Gallons
Unable to fill hole
~n Water Percolation Calculated
Level Rate Infiltration
(inches) (min/inch) (gal/hr/sf)
Attempted to fill test hole unable to obtained a 10 inch head
TECHNICIAN: ____ W...:..D...;.rr_M _________ DATE: 2/20/2016
p 2
DEPTH OF TEST HOLE: 4 ----------------TEST HOLE SIZE: -----6inch
S O1 L CLASSIFICATION: Red Brown, Slightly Clayey Sand, Moist (SC)
START
STOP
Time
10:20 AM
10:30 AM
10:32 AM
10:42 AM
10:45 AM
10:55 AM
10:58 AM
11 :08 AM
Roosevelt
PRESOAK PERIOD
TIME INTERVAL
11:30 AM
10:15 AM
2/19/16
2/20/16 (no water left in test hole)
TEST PERIOD
Initial Water Final Water Time Interval (min) Level (inches) Level (inches)
10 10.0 1.9
10 10.0 1.8
10 10.0 1.8
10 10.0 1.8
AMOUNT OF WATER USED
35 Gallons
~n Water Percolation Calculated
Level Rate Infiltration
(inches) (min/inch) (gal/hr/sf)
8.1 1.2 3.0
8.2 1.2 3.1
8.2 1.2 3.1
8.2 1.2 3.1
TECHNICIAN: WDrrM DATE: 2/20/2016 ------------
Notto
Scale
__ ; .'UI ,f,..~.
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..__ ___ _t::::.::___JL....l-b__:::::1..__,._.--..j. ..-L-1.t~§!}-H I
I Geotechnical Legend
$ Percolation Test Location
P-2
All locatlons approximate
Beachwalk on Roosevelt
PN: 3447-$D3
,.11
Feb 20/6
Percolation Test
Location Map
l I
I
Figure 1
Appendix I: Forms and Checklists
Factor of Safety and Design Infiltration Rate
Worksheet Form 1-9
Factor Category Factor Description Assigned Factor Value (v) Product (p) p =
Weight (w) wxv
Soil assessment methods 0.25 2 0.5
Predominant soil texture 0.25 2 0.5
Site soil variability 0.25 1 0.25
Depth to groundwater / impervious layer 0.25 1 0.25
Suitability Suitability Assessment Safety Factor, SA= Sum of p 1.5
A Assessment
Level of pretreatment/ expected 0.5 3 1.5
sediment loads
Redundancy/ resi Ii ency 0.25 1 0.25
Compaction during construction 0.25 2 0.5
Design
Design Safety Factor, Se = Sum of p 2.25
B
Combined Safety Factor, Stotal= SA x Se 3.375
Observed Infiltration Rate, inch/hr, Kobserved (corrected for test-specific bias) 1.7
Design Infiltration Rate, in/hr, Kdeslgn = Kobserved / Stotal 0.50
Supporting Data
Briefly describe infiltration test and provide reference to test forms:
A percolation test was performed in general accordance with San Diego County DEH procedures. Refer to the test summary
report prepared by Geoteck dated February 27, 2016.
ATTACHMENT 2
BACKUP FOR PDP HYDROMODIFICATION CONTROL MEASURES
[This is the cover sheet for Attachment 2.]
Indicate which Items are Included behind this cover sheet:
Attachment Contents Checklist
Sequence
Attachment 2a Hydromodification Management D Included
Exhibit (Required)
See Hydromodification Management
Exhibit Checklist on the back of this
Attachment cover sheet.
Attachment 2b Management of Critical Coarse D Exhibit showing project drainage
Sediment Yield Areas (WMAA boundaries marked on WMAA
Exhibit is required, addition~! Critical Coarse Sediment Yield
analyses are optional) Area Map (Required)
See Section 6.2 of the BMP Design Optional analyses for Critical
Manual. Coarse Sediment Yield Area
Determination
D 6.2.1 Verification of Geomorphic
Landscape Units Onsite
□ 6.2.2 Downstream Systems
Sensitivity to Coarse Sediment
□ 6.2.3 Optional Additional Analysis
of Potential Critical Coarse
Sediment Yield Areas Onsite
Attachment 2c Geomorphic Assessment of D Not performed
Receiving Channels (Optional) □ Included
See Section 6.3.4 of the BMP Design
Manual.
Attachment 2d Flow Control Facility Design and □ Included
Structural BMP Drawdown
Calculations (Required)
See Chapter 6 and Appendix G of
the BMP Desian Manual
Beachwalk at Roosevelt
Use this checklist to ensure the required information has been included on the
Hydromodification Management Exhibit:
The Hydromodification Management Exhibit must identify:
□ Underlying hydrologic soil group
D Approximate depth to groundwater
D Existing natural hydrologic features ( watercourses, seeps, springs, wetlands)
D Critical coarse sediment yield areas to be protected (if present)
o Existing topography
D Existing and proposed site drainage network and connections to drainage offsite
□ Proposed grading
D Proposed impervious features
o Proposed design features and surface treatments used to minimize imperviousness
D Point(s) of Compliance (POC) for Hydromodification Management
D Existing and proposed drainage boundary and drainage area to each POC (when necessary,
create separate exhibits for pre-development and post-project conditions)
□ Structural BMPs for hydromodification management (identify location, type of BMP, and
size/detail)
Beachwalk at Roosevelt
Attachments 2a, b, c & d
N/A
Beachwalk at Roosevelt
ATTACHMENT 3
Structural BMP Maintenance Information
Use this checklist to ensure the required information has been included in the Structural
BMP Maintenance Information Attachment:
Preliminary Design/Planning/CEQA level submittal:
Attachment 3 must identify:
□ Typical maintenance indicators and actions for proposed structural BMP(s) based on
Section 7.7 of the BMP Design Manual
Final Design level submittal:
Attachment 3 must identify:
□ Specific maintenance indicators and actions for proposed structural BMP(s). This shall be
based on Section 7.7 of the BMP Design Manual and enhanced to reflect actual proposed
components of the structural BMP(s)
□ How to access the structural BMP(s) to inspect and perform maintenance
□ Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt
posts, or other features that allow the inspector to view necessary components of the
structural BMP and compare to maintenance thresholds)
□ Manufacturer and part number for proprietary parts of structural BMP(s) when applicable
o Maintenance thresholds for BMPs subject to siltation or heavy trash(e.g., silt level posts or
other markings shall be included in all BMP components that will trap and store sediment,
trash, and/or debris, so that the inspector may determine how full the BMP is, and the
maintenance personnel may determine where the bottom of the BMP is . If required, posts
or other markings shall be indicated and described on structural BMP plans.)
o Recommended equipment to perform maintenance
o When applicable, necessary special training or certification requirements for inspection and
maintenance personnel such as confined space entry or hazardous waste management
Beachwalk at Roosevelt
Attachment 3: Structural BMP Maintenance Thresholds and Actions
Inspection and Maintenance Activities for Treatment Control BMPs (TC-BMPs)
The structural treatment control BMPs for the proposed project consists of bioretention basins
and permeable pavers. The discussions below provide inspection frequency, maintenance
indicators and maintenance activities for the proposed structural BMPs. The proposed
bioretention basins and permeable paver areas should be inspected and maintained to ensure
proper functionality over time. The following tables provide recommendations for inspection and
maintenance for the bioretention basins and permeable pavers in order to ensure their lasting
effectiveness.
Bioretention Basins
During inspection, the inspector shall check for the maintenance indicators given below and take
the appropriate maintenance action:
Typical Maintenance I ndicator(s) Maintenance Actions for Vegetated BMPs
Accumulation of sediment, litter, or Remove and properly dispose of accumulated materials, without
debris damage to the vegetation.
Poor vegetation establishment Re-seed, re-plant, or re-establish vegetation per original plans.
Overgrown vegetation Mow or trim as appropriate, but not less than the design height
of the vegetation per original plans when applicable
Erosion due to concentrated irrigation Repair/ re-seed/ re-plant eroded areas and adjust the irrigation
flow system.
Erosion due to concentrated storm Repair/ re-seed/ re-plant eroded areas, and make appropriate
water runoff flow corrective measures such as adding erosion control blankets,
adding stone at flow entry points, or minor re-grading to restore
proper drainage according to the original plan. If the issue is not
corrected by restoring the BMP to the original plan and grade,
the City Engineer shall be contacted prior to any additional repairs
or reconstruction.
Standing water in or bioretention basin Make appropriate corrective measures such as adjusting irrigation
for longer than 96 hours following a system, removing obstructions of debris or invasive vegetation,
storm event* clearing underdrains (where applicable), or repairing/replacing
clogged or compacted soils.
Obstructed inlet or outlet structure Clear obstructions.
Damage to structural components Repair or replace as applicable.
such as weirs, inlet or outlet structures
*These BMPs typically include a surface ponding layer as part of their function which may take 96 hours to
drain following a storm event.
P(,rmeable Pavers
During inspection, the inspector shall check for the maintenance indicators given below and take
the appropriate maintenance action:
Typical Maintenance Indicator(s)
for Non-Vegetated Infiltration Maintenance Actions
BMPs
Accumulation of sediment, litter, or
debris in infiltration basin, pre-Remove and properly dispose accumulated materials. treatment device, or on permeable
pavement surface
This condition requires investigation of why infiltration is not
Standing subsurface occurring. If feasible, corrective action must be taken to restore water U1 infiltration (e.g. flush fme sediment or remove and replace clogged infiltration gallery for longer than 96 soils). BMP may require retrofit if infiltration cannot be restored. hours following a storm event If retrofit is necessary, municipal staff must be contacted prior to
any repairs or reconstruction.
Standing water in permeable paving Flush fine sediment from paving and subsurface gravel. Provide
area routine vacuuming of permeable paving areas to preventclogging.
Damage to permeable paving surface Repair or replace damaged surface as appropriate.
Note: \Vhen inspection or maintenance indicates sediment is accumulating in an infiltration BMP,
the DMA draining to the infiltration BMP should be examined to determine the source of the
sediment, and corrective measures should be made as applicable to minimize the sediment supply.
Inspec tion and Maintenance Frequency
The Table below lists the TC-BMPs to be inspected and maintained and the minimum frequency
of inspection and maintenance activities.
Summary Table of Inspection and Maintenance Frequency
Access to Inspection Maintenance Recommended
BMPS Features Thresholds equipment to
Inspection perform
BMP Frequency Maintenance Frequency maintenance
Routine maintenance to Basins located along Outlet pipes, area N /A-not Any typical
remove accumulated materials Roosevelt Street drains, channel drains subject to equipment used in
At a minimum:
at the inlets and outlets: frontage can be and overflow inlets siltation or heavy landscape
Bioretention annually, and after
annually, on or before accessed by private are available for any trash maintenance (i.e.
Basins major storm
September 30th. As-needed driveways or inspection needs. shovel, etc.)
events
maintenance based on walkways or planted
maintenance indicators area along ROW
Routine maintenance to Pavers are located in Gaps between pavers N/A-not Vaccuum clean
remove accumulated materials private driveways and provide material subject to surface using
At a minimum:
at the inlets, outlets and gaps are accessible accumulation to be siltation or heavy commercially
Permeable annually, and after
in pavers: annually, on or anywhere they are visually inspected and trash available sweeping
Pavers major storm
before September 30th. As-located on site. removed. machines
events
needed maintenance based on
maintenance indicators
The frequencies given in the Summary Table of Inspection and Maintenance Frequency are minimum recommended frequencies for inspection and
maintenance activities for the project. Typically, the frequency of maintenance required for structural B:MPs is site and drainage area specific. If it is
determined during the regularly scheduled inspection and/ or routine maintenance that a structural B:MP requires more frequent maintenance (e.g., to remove
accumulated trash) it may be necessary to increase the frequency of inspection and/ or routine maintenance.
Recordkeeping Requirements
The party responsible to ensure implementation and funding of maintenance of structural BMPs
shall maintain records documenting the inspection and maintenance activities. The records must
be kept a minimum of 5 years and shall be made available to the City of Carlsbad for inspection
upon request at any time.
ATTACHMENT 4
City standard Single Sheet BMP (SSBMP) Exhibit
[Use the City's standard Single Sheet BMP Plan.]
Beachwalk at Roosevelt
72 ROOSEVELTSTREET
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ROOSEVELT STREET ____ ,,__, ________ ,. ___ ,., _________ ..... , ........ ,,, _______ _
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SWMPNO. 15-28
PAR1Y RESPONSIBLE FOR MAINTENANCE:
NAME MR CARLSBAD 11. LLC
ADDRESS 1818 RRST AVENUE. SUITE 100
SAN DIEGO. CA 92131 CONT ACT GEOFF MCCOMIC
PHONE NO, (619) 481-3830
PLAN PREPARED BY:
NAME BRIAN ARDOLINO 1)0vOL--
C(HJANY PASCO LARET SU/1ER & ASSOCIA1ES. INC. SIGNATURE
ADDRESS 535 N. HWY 101, STE A
5QLANA BEACH, CA 92075
PHONE NO_ (858) 259-8212
BMPNOTES: CERTIFICATION ____ _
i. 11£SE 8MPS APE MANDATORY TO BE INSTALLED PER MANUFACTURERS
PECOMMENDA TIONS OR THESE PLANS.
2. NO CHANGES TO 11£ PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR
APPROVAL FROM THE CITY ENGI/'EER.
3. NO SUBSTITUTIONS TO TIE MATERIAL OR TYPES OR PLANTING TYPES
WITHOUT PRIOR APPROVAL FROM Tl£ CITY ENGINEER.
4. NO OCCUPANCY WILL BE GRANTED UNTIL THE CITY INSPECTION STAFF
HAS INSPECTED THIS PROJECT FOR APPROPRIATE BMP CONSTRUCTION
AND INSTALLATION.
5. REFER TO MAINTENANCE AGREEMENT DOC1J4ENT.
6. SEE PROJECT SWMP FOR ADDITIONAL INFORMATION.
BMP TABLE
BMPID# BMPlYPE SYMBOL Ct«JANO. QUANTllY
TREATMENT CONTROL
(])-@ PERVIOOS ~((-d=>-!;< TC-1D 5,616 SF. PAVEMENT " ' > . >-y~ :'-';: :-:.
HYDROMODIFICATION & TREATMENT CONTROL
I~-M7e 11&1
0
DATE INITIAL
GRAPHIC SCALE
10
/1\
@-@; BIORETENTION :~ TC-32 AREA
HYDROMODIFICATION
LOW IMPACT DESIGN (LI.D.)
@-® ROOF DRAIN TO • SD-11 LANDSCAPING
SOURCE CONTROL
® STENCILS /lJ flJf'IJG SD-13 µJA1}6WIJJ;,W
1 '~ 10'
20 30
DATE INlllAL
ENGINEER OF WORK REVISION DESCRIPTION O1HER APPROVAL
--------------------------··
589 SF.
52 EA.
DATE INlllAL
CllY APPROVAL
DRAWING NO. SHEET NO.(S) INSPECTION MAINTENANCE
FREQUENCY FREQUENCY
490-BA 2. 3 SEMI-ANNUALLY ANNUALLY
490-BA 2. 3 GUARTERLY SEMI-ANNUALLY
490-BA 2, 3 AmUALLY ANN/JAi.LY
I SH1EET I CITY OF CARLSBAD I SH1ETS I
ENGINEERING DEPARTMENT
SINGLE SHEET BMP SITE PLAN
BEACHWALK AT ROOSEVELT
2685, 2687, & 2715 ROOSEVELT STREET
RECORD COPY PROJECT NO.
CT 14-07
I
DRAWING NO.
I INITIAL DAlE 490-6A
8/9/2016 PE 2ii0