HomeMy WebLinkAboutCT 16-02; OCEAN; PROPERTY DEVELOPMENT PROJECT STORM WATER QUALITY MANAGEMENT PLAN FOR OCEAN CONDOMINIUMS; 2016-08-23' )
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CITY OF CARLSBAD
PRIORITY DEVELOPMENT PROJECT {PDP)
STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR
Ocean Condominiums
CT 16-02 / RP 16-08
SWQMP# __
ENGINEER OF WORK:
DAVID A. WIENER RCE 77285 EXP 6/30/2017
PREPARED FOR:
MJNF HOLDING, LLC
1907 APPLE STREET, SUITE 8
OCEANSIDE, CA 92054
CONTACT: JAN JANSSON
PREPARED BY:
MICHAEL BAKER INTERNATIONAL
5050 A VENIDA ENCINAS, SUITE 260
CARLSBAD, CA 92008
dwiener@mbakerintLcom
(760) 603-6252
DATE:
March 29, 2016
Revised: August 23, 2016
SEP O 8 2016
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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: DMA Exhibit
Attachment 1 b: Tabular Summary of DMAs and Design Capture Volume Calculations
Attachment 1c: Harvest and Use Feasibility Screening (when applicable)
Attachment 1d: Categorization of Infiltration Feasibility Condition (when applicable)
Attachment 1e: 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
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Michael Baker
INTERNATIONAL
Project Name: Ocean Condominiums
Project ID: CT 16-02 / RP 16-08
CERTIFICATION PAGE
Ocean Condominiums
CT 16-02 / RP 16-08
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.
,{P ~ RCE n2ss EXP 6/30/2017
Engineer of Work's Signature, PE Number & Expiration Date
DAVID A. WIENER
Print Name
MICHAEL BAKER INTERNATIONAL
Company
August 23, 2016
Date
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Michael Baker
INTERNATIONAL
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PROJECT VICINITY MAP
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Ocean Condominiums
CT 16-02 / RP 16-08
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
( City of
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 incorrecUy 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: Oce~n PROJECT ID:
ADDRESS: 2501 State Street, carlsbad APN: 155-200-10
The project is (check one): 0 New Development ~ Redevelopment
The total proposed disturbed area is: ft2 ( .49 ) acres
The total proposed newly created and/or replaced impervious area is: 16,603 ft2 ( 0.38 ) 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 REV02/16
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
STEP1
TO BE COMPLETED FOR ALL PROJECTS
To determine if your project is a "development projecr, please answer the following question:
YES NO
Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building D ~ or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)?
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 vou answered "no" to the above auestion, the proiect is a 'development prolect', ao 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; D li2I 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 D ~ accordance with the USEPA Green Streets guidance?
3 . Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual? D ~
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 you answered "no" to the above auestions, vour oroiect is not exemot from PDP, ao to Step 3 .
E-34 Page 2 of 4 REV 02/16
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
an:r3
TO BE COIIPLETED FOR ALL NEW OR REDEVELOPIIENT PROJECTS
To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1)):
YES
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, D
and l)ub/ic deve/ol)ment l)roiects on oub/ic or l)rivate 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 lt2l more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public
deve/ol)ment l)roiects on l)Ublic or l)rivate 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
refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial
D
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 D
develooment oroiect includes develooment on any natural slope that is twentv-five =rcent or oreater .
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 D 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 D freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface
used for the transoortation 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 ton includes ffow that is conveyed overland a distance of D
200 feet or less from the project to the ESA. or conveyed in a pipe or open channel any distance as an
isolated ffow from the l)roiect to the ESA (i.e. not comminaled with ffows 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 D 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 D RGO's that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily
Traffic (ADTJ of 100 or more vehicles =r day .
10. Is your project a new or redevelopment project that results in the disturbance of one or more acres of land
and are expected to generate pollutants post construction? D
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 D
21 .203.040)
NO
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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 staling "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 statina "Mv oroiect is a 'STANDARD PROJECT' .. ." and comolete aoolicantinformation .
E-34 Page 3 of4 REV02/16
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
STEP,
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) = 15,ooo sq. ft. D Ii!!
Total proposed newly created or replaced impervious area (B) = 16-603 sq. ft.
Percent impervious area created or replaced (B/A)*100 = 104 %
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 BMP's required for PDP apply to the entire development. Go to step 5, check the
check the first box statini:i "My project is a PDP ... " and complete applicant information .
8TEP5
CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION
Ii!! 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-36" 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 .
0 My Project is NOT a 'development project' and is not subject to the requirements of the BMP Manual.
Applicant Information and Signature Box
Michael Baker International
Applicant Name: David Wiener, PE Applicant TiUe: Civil Engineer
Applicant Signature: L9-J> l,,i__j Date: 8/22/2016
.. .. Environmentally Sensitive Areas include but are not limited to alt Clean Water Act Section 303(d) mpa,red water bodies, areas designated as Areas of Spec,al
Biological Significance by the State Water Resources Control Board (Water Oualtty Control Plan for the San Diego Basin (1994) and amendments); water bodies
designated with the RARE beneficlal use by the State Wafer Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and
amendments); areas designated as preserves °' their equivalent under the Multi Species Conservation Program within the Ctties and County of San Diego; Habitat
Management Plan; and any other equivalent envimnmentany sensitive areas 'Mlich have been identified by the Ctty.
This Box for Citv Use Onlv
YES NO
City Concurrence: D D
By:
Date:
Project ID:
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
SITE INFORMATION CHECKLIST
Project Summary Information
Project Name Ocean Condominiums
Project ID CT 16-02 I RP 16-08
Project Address
2501 State Street
Assessor's Parcel Number(s) (APN{s)) 155-200-10
Project Watershed {Hydrologic Unit) Carlsbad 904
Parcel Area 0.49 Acres ( 21,223 Sauare Feet)
Existing Impervious Area
0.37 Acres {16,000 Square Feet) (subset of Parcel Area)
Area to be disturbed by the project
0.50 Acres {21,923 Square Feet) {Project Area) Includes (700 SF) in City ROW for driveway & sidewalk
Project Proposed Impervious Area 0.40 Acres (17,303 Square Feet) (subset of Project Area) Includes (700 SF) in City ROW for driveway & sidewalk
Project Proposed Pervious Area 0.11 Acres (4,620 Square Feet) (subset of Project Area)
Note: Proposed Impervious Area+ Proposed Pervious Area= Area to be Disturbed by the
Project.
This may be less than the Parcel Area .
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
Description of Existing Site Condition and Drainage Patterns
Current Status of the Site (select all that apply}:
CEl Existing development
0 Previously graded but not built out
0 Agricultural or other non-impervious use
0 Vacant, undeveloped/natural
Description / Additional Information:
Existing office building, landscaping, parking lot, and driveway .
Existing Land Cover Includes (select all that apply):
CEl Vegetative Cover
0 Non-Vegetated Pervious Areas
CEl Impervious Areas
Description / Additional Information:
Existing office building, landscaping, asphalt parking lot, and asphalt driveway .
Underlying Soil belongs to Hydrologic Soil Group (select all that apply}:
0 NRCS Type A
0 NRCS Type B
0 NRCS Type C
CEl NRCS Type D
Approximate Depth to Groundwater (GW):
D GW Depth < 5 feet
O 5 feet < GW Depth < 10 feet
CEl 10 feet < GW Depth < 20 feet
0 GW Depth > 20 feet
Existing Natural Hydrologic Features (select all that apply):
0 Watercourses
OSeeps
D Springs
OWetlands
CEl None
Description/ Additional Information:
None on site. Site drains directly to Buena Vista Lagoon
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
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]:
Runoff from the site flows to State Street, where it enters existing inlets connecting to
public storm drain. The storm drain outfalls directly to Buena Vista Lagoon, which is
just northeast of the project site .
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
Description of Proposed Site Development and Drainage Patterns
Project Description / Proposed Land Use and/or Activities:
rrhe site will consist of a parking garage podium at ground level. On top of the podium will be 17
~ondominium units. A pervious paver walkway is proposed on one side of the building. New driveway
~ccess will be constructed within the public right-of-way .
List/describe proposed impervious features of the project (e.g., buildings, roadways, parking
lots, courtyards, athletic courts, other impervious features):
[mpervious areas include building roof, patio areas, and walkways between the condominium units .
List/describe proposed pervious features of the project (e.g., landscape areas):
Pervious areas include landscaping & pervious paver walkway at ground level, and raised planters on
podium deck.
Does the project include grading and changes to site topography?
DYes
l&JNo
Description/ Additional Information:
[he existing site is a flat pad, as is the proposed .
Does the project include changes to site drainage (e.g., installation of new storm water
conveyance systems)?
00 Yes
DNo
Description / Additional Information:
Onsite private storm drain will convey runoff from the roofs and podium deck to raised planters. The
raised planters will be connected to piping to discharge to State Street via sidewalk underdrain .
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
Identify whether any of the following features, activities, and/or pollutant source areas will be
present (select all that apply):
IBJ On-site storm drain inlets
IBJ Interior floor drains and elevator shaft sump pumps
IBJ Interior parking garages
D Need for future indoor & structural pest control
D Landscape/Outdoor Pesticide Use
D Pools, spas, ponds, decorative fountains, and other water features
D Food service
D Refuse areas
D Industrial processes
D Outdoor storage of equipment or materials
D Vehicle and Equipment Cleaning
D Vehicle/Equipment Repair and Maintenance
D Fuel Dispensing Areas
D Loading Docks
IBJ Fire Sprinkler Test Water
IBJ Miscellaneous Drain or Wash Water
D Plazas, sidewalks, and parking lots
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
Identification of Receiving 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):
Kiutter along State Street, Storm drain piping, Buena Vista Lagoon, Pacific Ocean
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 Lagoon Indicator Bacteria, nutrients,
sedimentation/siltation
Identification of Prolect Site Pollutants
Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see
BMP Design Manual Appendix B.6):
Also a Receiving
Not Applicable to Anticipated from the Water Pollutant of
Pollutant the Project Site Project Site Concern
X X
Sediment
X X
Nutrients
X
Heavv Metals
X
Organic Compounds
X
Trash & Debris
Oxygen Demanding X
Substances
X
Oil & Grease
X
Bacteria & Viruses
X
Pesticides
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Michael Baker
INTERNATIONAL
Ocean Condominiums
CT 16-02 / RP 16-08
Do hydromodification management requirements apply (see Section 1.6 of the BMP Design
Manual)?
D Yes, hydromodification management flow control structural BMPs required .
D 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 .
D 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 .
IRl No, the project will discharge runoff directly to an area identified as appropriate for
an exemption by the W MAA for the watershed in which the project resides.
Description/ Additional Information (to be provided if a 'No' answer has been selected above):
he site drains to the gutter on State Street, enters existing storm drain piping, and discharges to Buena
ista Lagoon. Buena Vista Lagoon is an exempt water body per the Carlsbad WMA WQIP .
Based on the maps provided within the WMAA, do potential critical coarse sediment yield areas
exist within the project drainage boundaries?
DYes
IRl 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?
D 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite
D 6.2.2 Downstream Systems Sensitivity to Coarse Sediment
D 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 W MAA maps
If optional analyses were performed, what is the final result?
D 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.
D 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:
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Michael Baker
INTERNATIONAL
Flow Control for Post-Project Runoff* . . .
Ocean Condominiums
CT 16-02 / RP 16-08
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.
N/A
Has a geomorphic assessment been performed for the receiving channel(s)?
D No, the low flow threshold is 0.102 (default low flow threshold)
D Yes, the result is the low flow threshold is 0.102
D Yes, the result is the low flow threshold is 0.302
D 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)
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Michael Baker
INTERNATIONAL
Other Site Requirements and Constraints
Ocean Condominiums
CT 16-02 / RP 16-08
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 .
Optional Additional Information or Continuation of Previous Sections As Needed
This space provided for additional information or continuation of information from previous
sections as needed .
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Michael Baker
INTERNATIONAL
( City of
Carlsbad
Project Name: Ocean Condominiums
Project ID: CT 16-02 / RP 16-08
DWG No. or Building Permit No.:
STANDARD PROJECT
REQUIREMENT
CHECKLIST
E-36
Project Information
Source Control BMPa
Oce~n Condominiums
CT 16-02 / RP 16-08
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 Requl,.,..nt Applied?
SC-1 Prevention of Illicit Discharges into the MS4 0 Yes I D No ID N/A
Discussion/justification if SC-1 not implemented:
SC-2 Storm Drain Stenciling or Signage i2I Yes I D No I D NIA
Discussion/justification if SC-2 not implemented:
SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind 0 Yes I D No I D N/A Dispersal
Discussion/justification if SC-3 not Implemented:
E-36 Page 1 of 4 Revised 03/16
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Michael Baker
INTERNATIONAL
Source Control Reaulrement (continued)
Ocean Condominiums
CT 16-02 / RP 16-08
Annlled?
SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and i2I Yes ONo Wind DisnArsal
Discussion/justification if SC-4 not implemented:
SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal i2I Yes ONo
Discussion/justification if SC-5 not implemented:
0 N/A
0 NIA
SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and
identifv additional BMPs. (See Table in Appendix E.1 of BMP Manual for guidance).
O On-site storm drain inlets i21Yes ONo 0 N/A
O Interior floor drains and elevator shaft sump pumps i21Yes ONo 0 N/A
O Interior parking garages i2I Yes ONo 0 N/A
O Need for future indoor & structural pest control i2I Yes ONo 0 N/A
O Landscape/Outdoor Pesticide Use i21Yes ONo 0 NIA
O Pools, spas, ponds, decorative fountains, and other water features OYes ONo i21 N/A
O Food service OYes ONo i21 N/A
O Refuse areas i21Yes ONo 0 N/A
O Industrial processes OYes ONo i21 N/A
O Outdoor storage of equipment or materials i2I Yes ONo 0 N/A
O Vehicle and Equipment Cleaning OYes ONo i21 N/A
O Vehicle/Equipment Repair and Maintenance OYes ONo i21 N/A
O Fuel Dispensing Areas OYes ONo i21 N/A
O Loading Docks OYes ONo i21 N/A
O Fire Sprinkler Test Water i21Yes ONo 0 NIA
O Miscellaneous Drain or Wash Water i2I Yes ONo 0 NIA
O Plazas, sidewalks and parking lots i2I Yes ONo 0 N/A
For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers .
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Michael Baker
INTERNATIONAL
Site Dnlgn BMPs
Ocean Condominiums
CT 16-02 / RP 16-08
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.
• "NIA" 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 Drainaoe Pathways and Hydroloaic Features I OYes I 0 No I i21 N/A
Discussion/justification if SD-1 not implemented:
S0-2 Conserve Natural Areas, Soils, and Vegetation I OYes I i21 No I ON/A
Discussion/justification if SD-2 not implemented:
Existing vegetation is minimal and will be removed. New landscaping will be provided per landscape plan .
SD-3 Minimize lmoervious Area I i21 Yes I 0 No I ON/A
Discussion/justification if SD-3 not implemented:
S0-4 Minimize Soil Compaction I O Yes I O No I i21 N/A
Discussion[Justification if SD-4 not implemented:
S0-5 Impervious Area Dispersion I OYes I ONO I i21 NIA
Discussion/justification if SD-5 not implemented:
E-36 Page 3 of 4 Revised 03/16
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Michael Baker
INTERNATIONAL
Source Control Raaulrement fcontlnuad\
SD-6 Runoff Collection
Discussion/justification if SD-6 not implemented:
SD-7 Landscaping with Native or Drought Tolerant Species
Discussion/justification if SD-7 not implemented:
SD-8 Harvestina and Usina Precipitation
Discussion/justification if SD-8 not implemented:
Ocean Condominiums
CT 16-02 / RP 16-08
I Annlled?
I iia Yes I D No I D NIA
I 0 Yes I D No I D N/A
I OYes I iia No I D NIA
Proposed irrigation and plumbing demand is not large enough to make harvest & reuse viable .
E-36 Page 4 of 4 Revised 03/16
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Michael Baker
INTERNATION A L
SUMMARY OF PDP STRUCTURAL BMPS
PDP Structural BMPs
Ocean Condominiums
CT 16-02 / RP 16-08
All PLJPs must implement structural s for storm water pollutant control (see 1..,;napter 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.
OMAs 1-15 drains to BMPs 1-15, which are biofiltration via raised planters located on the garage podium
deck. The surface types include roofs and exposed concrete hardscape (walkways, common areas) .
OMA 20 is a self-retaining area at ground level, consisting of permeable pavement walkways. OMA 21 is
a self-mitigating area at ground level, consisting of landscape area. OMA 22 is a de minimis area at
ground level, consisting of concrete steps connecting building exits to paver walkways .
Underlying soils are Type 0 , per Geotechnical Report. The measured infiltration rate was measured to be
. of inches/hour, which reduces to .01 '4 in/hr with safety factor included .
The project is exempt from hydromodification management requirements because it discharges directly to
Buena Vista Lagoon via exempt outfall (66" pipe) per Hydromodification Exemption Analyses for Select
Carlsbad Watersheds, by Chang Consultants, dated June 10, 2013 .
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Michael Baker
INTERNATIONAL
Structural BMP Summary Information
Structural BMP ID No. 1-15
DWG Sheet No.
Type of structural BMP:
D Retention by harvest and use (HU-1)
D 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)
CEl Biofiltration (BF-1)
Ocean Condominiums
CT 16-02 / RP 16-08
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)
D Detention pond or vault for hydromodification management
D Other (describe in discussion section below)
Purpose:
CEl Pollutant control only
D Hydromodification control only
D Combined pollutant control and hydromodification control
D Pre-treatment/forebay for another structural BMP
D Other (describe in discussion section below)
Discussion (as needed):
These biofiltration BMPs are raised planters on the podium deck of the proposed building. All exposed
roof and hardscape areas will drain to one of the fifteen biofiltration planters prior to discharging from the
site .
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Michael Baker
INTERNATIONAL
Structural BMP Summary Information
Structural BMP ID No. 20
DWG Sheet No .
Type of structural BMP:
D Retention by harvest and use (HU-1)
D Retention by infiltration basin (INF-1)
D Retention by bioretention (INF-2)
!RI Retention by permeable pavement (INF-3)
D Partial retention by biofiltration with partial retention (PR-1)
D Biofiltration (BF-1)
Ocean Condominiums
CT 16-02 / RP 16-08
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)
D Detention pond or vault for hydromodification management
D Other (describe in discussion section below)
Purpose:
!RI Pollutant control only
D Hydromodification control only
D Combined pollutant control and hydromodification control
D Pre-treatment/forebay for another structural BMP
D Other (describe in discussion section below)
Discussion (as needed):
Permeable pavers are proposed for walkways at ground level outside of the building/podium footprint.
These areas are self-retaining, as there is no outside tributary area being directed to the pavers .
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0
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0
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0
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Attachment
Sequence
Attachment 1 a
Attachment 1 b
Attachment 1 c
Attachment 1 d
Attachment 1 e
ATTACHMENT 1
BACKUP FOR PDP POLLUTANT CONTROL BMPS
This is the cover sheet for Attachment 1.
Check which Items are Included behind this cover sheet:
Contents
OMA Exhibit (Required}
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 8.3-1 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}
Refer to Appendices C and D of the
BMP Design Manual to complete
Form 1-8 .
Pollutant Control BMP Design
Worksheets/ Calculations (Required}
Refer to Appendices B and E of the
BMP Design Manual for structural
pollutant control BMP design
guidelines
Checklist
IRl Included
IRl Included on OMA Exhibit in
Attachment 1 a
D Included as Attachment
1 b, separate from OMA
Exhibit
IRl Included
D Not included because the
entire project will use infiltration
BMPs
IRl Included
D Not included because the
entire project will use harvest
and use
BMPs
IRl Included
,,, ,,
0
0
0
0
0
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0
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Use this checklist to ensure the required information has been included on the DMA
Exhibit:
The OMA Exhibit must identify:
D 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)
D Existing topography and impervious areas
D Existing and proposed site drainage network and connections to drainage offsite
D Proposed grading
D 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)
D Structural BMPs (identify location and type of BMP)
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ATTACHMENT la
DMAEXHIBIT
Ocean Condominiums
SWQMP
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PLANVIEW -ABOVE PODIUM DECK
ROOF DOWNSPOUT
OR DRAIN FROM
HARDSCAPE
PERMEABLE BASE
BIOFILTRATION SOIL
OVERFLOW INLET
LEGEND
RAISED PLANTER ON POD I UM DECK PER !lilflllllfflll
DETAIL HEREON (BIOFILTRATION BMP) !!!!___.
IMPERVIOUS ROOF K~ ~ ~
IMPERVIOUS EXPOSED HARDSCAPE I:. ::-:: l
DRAINAGE MANAGEMENT AREA (OMA) 0
WATER QUALITY CALCS -PODIUM
IMPERVIOUS MINIMUM PLANTER AREA OMA/ AREA (SF) BIOFIL TRA TION (SF) PROVIDED (SF) BMP REQUIRED (SF)
1 5,570 5, 155 140 415
2 575 455 13 120
3 300 275 8 25
4 782 712 19 70
5 1 , 180 985 27 195
6 447 360 10 87
7 1,375 1,292 35 83
8 450 418 1 1 32
9 2,785 2,607 71 -178
10 1, 127 1,087 29 40
1 1 454 414 1 1 40
TOTAL 15,045 13,760 375 1,285
20 10 0 20 40 60 1-~,----1 __ 1--,
SCALE: 1 "=20'
PLANTER WALLS
PERFORATED PIPE
(UNDERDRAIN)
PODIUM SLAB OUTFALL PIPE TO BLDG_}
STORM DRAIN PIPING
RAISED PLANTER DETAIL (BIOFILTRATION BMP)
'"_j
CT 16-02 / RP 16-08
i • : J
LEGEND
PERMEABLE PAVER WALKWAY
PER DETAIL HEREON
LANDSCAPE AREA i1Uffllllflffl
' ' ! l. DRAINAGE MANAGEMENT AREA (DMA) 0
RAISED
PODIUM
WATER QUALITY CALCS -GROUND LEVEL
OMA AREA(SF)
20 1 , 410
21 1 , 610
22 225
TOTAL 3,245
GROUND LEVEL -OUTSIDE OF PODIUM
PERMEABLE PAVING SYSTEM
SUBGRADE
COMPACTED TO 90%.
~--JOINT & VOID FILLER
1 .5"-2" NO. 8
DRAINAGE AGGREGATE
CLASS 2 PERMEABLE BASE
140N FILTER FABRIC
PERVIOUS UNIT PAVER DETAIL
NTS
SURFACE OMA TYPE
PERVI0US PAVER SELF-RETAINING
LANDSCAPE SELF-MITIGATING
CONCRETE DE MINIMIS
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Job Number 149147
PREPARED BY:
NAME:
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MICHAEL BAKER INTERNATIONAL
ADDRESS:
5050 A VENIDA ENCINAS
SUITE 260
CARLSBAD, CALIFORNIA 92008
1760) 476-9193
CONT ACT: DAVID WIENER
Michael Baker
INTERNATIONAL
5050 Avenida Encinas, Suite 260
Carlsbad, CA 92008
Phone: (760) 476-9193
MBAKERINTL.COM
SHEET TITLE:
DMAEXHIBIT
REVISION 1: 9/8/2016
ORIGINAL DATE: 3/29/2016
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Ocean Condominiums
ATTACHMENT 16
DMAandDCVSUMMARY
SWQMP
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DMA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
20
21
22
Total (sf)
(ac)
Proposed
Impervious
(sf)
895
455
275
712
382
4,110
985
360
1,292
880
418
1,818
2,607
1,087
414
0
0
225
16,915
0.39
Ocean Condominiums
OMA SUMMARY
Percent
Total Area (sf) Impervious BMPType
970 92.3% Biofiltration
575 79.1% Biofiltration
300 91.7% Biofiltration
782 91.0% Biofiltration
440 86.8% Biofiltration
4,525 90.8% Biofiltration
1,180 83.5% Biofiltration
447 80.5% Biofiltration
1,375 94.0% Biofiltration
970 90.7% Biofiltration
450 92.9% Biofiltration
1,910 95.2% Biofiltration
2,785 93.6% Biofiltration
1,127 96.5% Biofiltration
454 91.2% Biofiltration
1,410 0.0% Self-Retaining
1,610 0.0% Self-Mitigating
225 100.0% De Minimis
21,535 78.5%
0.49
BMP
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Raised Planter
Pervious Pavers
Landscape
n/a
•••••••••••••••••••••••••••••••••
Design Capture Volume
Surface Type Runoff Factor 1 2 3
Impervious 0.9 895 455 275
Pervious Paver 0.3 0 0 0
Landscape 0.1 75 120 25
Tributary Area (sf) 970 575 300
85th " Storm (in) Adjusted Runoff Factor 0.84 0.73 0.83
0.58 DCV(cf) 39 20 12
4
712
0
70
782
0.83
31
Ocean Condominiums
DCV Summary
s 6 7 8
382 4,110 985 360
0 0 0 0
58 415 195 87
440 4,525 1,180 447
0.79 0.83 0.77 0.74
17 181 44 16
OMA Area
9 10 11 12 13 14 15
1,292 880 418 1,818 2,607 1,087 414
0 0 0 0 0 0 0
83 90 32 92 178 40 40
1,375 970 450 1,910 2,785 1,127 454
0.85 0.83 0.84 0.86 0.85 0.87 0.83
57 39 18 80 114 47 18
••••••••
I
20 21 22 I
0 0 225
1,410 0 0
0 1,610 0
1,410 1,610 225
0.30 0.10 0.90
20 8 10
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Ocean Condominiums
ATTACHMENT le
HARVEST AND USE FEASIBILITY
SWQMP
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Appendix I: Forms and Checklists
1. Is there a demand for harvested water (check all that apply) at the project site that is reliably present during
the wet season?
1KJ Toilet and urinal flushing
@ Landscape irrigation
D Other: _____ _
2. If there is a demand; estimate the anticipated average wet season demand over a period of 36 hours .
Guidance for planning level demand calculations for toilet/urinal flushing and landscape irrigation is provided
in Section B.3.2 . Plumbing: 17 occupants *1.5* 9.3 gal/day= 105 gal in 36 hours
Irrigation (Moderate): 1,470 gal/acre• 0.06 acre= 81 gal in 36 hours
Total= 186 gal= 25 cf
3. Calculate the DCV using worksheet B-2.1 . DMA1=746cf
DMA 2 = 8 cf
total= 754 cf
DCV = __ 754 ___ (cubic feet)
3a. Is the 36 hour demand greater
than or equal to the DCV?
D Yes / Kl No c::::>
.0.
Harvest and use appears to be
feasible. Conduct more detailed
evaluation and sizing calculations
to confinn that DCV can be used
at an adequate rate to meet
drawdown criteria .
3b. Is the 36 hour demand greater than
0.25DCV but less than the full DCV?
D Yes / 129 No c::::>
.0.
I Iarvest and use may be feasible.
Conduct more detailed evaluation and
sizing calculations to determine
feasibility. Harvest and use may only be
able to be used for a portion of the site,
or (optionally) the storage may need to be
upsized to meet long term capture targets
while draining in longer than 36 hours .
Is harvest and use feasible based on further evaluation?
D Yes, refer to Appendix E to select and size harvest and use BMPs .
~ No, select alternate BMPs .
1-26
3c. Is the 36 hour demand
less than 0.25DCV?
l19 Yes
.().
Harvest and use is
considered to be infeasible .
February 2016
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Ocean Condominiums
ATTACHMENT 1d
INFILTRATION FEASIBILITY
SWQMP
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Appendix I: Forms and Checklists
Categorization of Infiltration Feasibility Form 1-8
Condition
Part t -Fµll Ipfiltration fcasihililf Sep-ming Criteria
Would infiltration of the full design volume be feasible &om a physical perapective without any undesirable
cooaequeoces 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 Appendix C.2 and Appendix
D .
Provide basis:
Yes No
>(
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:
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
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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:
Yea No
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 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 .
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 1nformat1on and best professional judgment cons1denng the definition of MEP 1n
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 Ipfilttatioo vs, No Ipfiltratiog feasihilin, 5c«mior Criteria
Would infiltration of water io 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 io 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 Appendix D .
Provide basis: J_ -:. c,.t>~ ,',,/~r
Yea No
X
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 fea sible to mitigate low infiltration rates .
6
Can Infiltration io any appreciable quantity be allowed
without increasing risk of geotechoical 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:
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 .
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 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 .
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:
X
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.
Part2
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 .
~,~
-h-1'~;,...,,
f.)/>'1 ,4
"" '"l
*To be completed using gathered site mformanon and best professional Judgment cons1denng the definition of MEP m
the MS4 Permit . .Additional testing and/ or studies may be required by the City to substantiate findings .
1-6 February 2016
• • • • • • • •
• • • • •
• • •
• • • • • • • • • • • • • • • • • • • • • • • •
Appendix I: Forms and Checklists
Factor of Safety and Design Infiltration Rate
Worksheet Form l-9
Factor Description Assigned Factor Product (p) Factor Category Weight (w) Value (v) p=wxv
Soil assessment methods 0.25 I e,.'2~
Predominant soil texture 0.25 1... . .,..
Suitability Site soil variability 0.25 I . 1 t;"" A Assessment Depth ro groundwater I impervious 0.25 I ,, . 2~ layer
Suitability Assessment Safety Factor, SA = Lp /.7.';'
Level of pretreatment/ expected 0.5 ,.~ sediment loads 3
B Design Redundancy/ resiliency 0.25 ' . z.r
Compaction during construction 0.25 1-,r
Design Safety Factor, Ss = LP '2., l. ~
Combined Safety Factor, S,ow= SA x Ss 3,5"
Observed Infiltration Rate, inch/hr, Kobsavcd
(corrected for test-specific bias) ().()~
Design Infiltration Rate, in/hr, K.ic,~, = Kobscrvcd / S,ow tJ .01 "'(
Supporting Data
Briefly describe infiltration test and provide reference to test forms:
P~~M~J (,~ A~S ,,;,; 1,
1-7 February 2016
• • • •
• • •
• • • • • • • • • • • • • • • •
• • • • • • • • • • • • • • • • •
Ocean Condominiums
ATTACHMENT le
POLLUTANT CONTROL BMP DESIGN
CALCULATIONS
SWQMP
• • • • • •
• • • • • • • • • •
• • • • • • • • • • • • • • • • • • • • • • •
OMA 20 -Permeable Pavers
Worksheet B.4-1: Simple Sizing Method for Infiltration BMPs
1 DCV orksheet B-2.1 DCV= 20
2 Estimated desi infiltration rate orksheet 0.5-1 K .. = • fJ 1'-1
3 Available BMP surface area A = 1,410
4 Avera e effective de th in the BMP foo = 0.014
5 Drawdown time T T= I 1..
6 Provide alternative calculation of drawdown time, if needed .
11. h,~ < ~ 6 ho.,. rs -::::> o k
cubic-feet
in/hr
s -ft
feet
hours
• • • • • • • •• • • • • • • • • • • • • • • • • •
• • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMPl
Remaining DCV after impl
Partial Retention
3 Allowable drawdown time for a
4
5
7 Assumed surface area of the biofiltration BMP
8
BMP Parameters
11 Surface Pondin 6 inch minimum 12 inch maximum
13 Aggregate Storage above underdrain invert ( 12 inches typical) -use 0 inches
for sizin if the a e ate is not over the entire bottom surface area
15 Media filtration rate to be used for sizin
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option I -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0.75 of remaining DCV in pores and ponding
22 Required Storage (surface + pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr.
36 hours
0 inches
0.4 in/in
0 inches
75 s -ft
0.1 in/in
11 cubic-feet
cubic-feet
6 inches
18 inches
12 inches
0.2 in/in
5 in/hr.
6 hours
30 inches
14 inches
44 inches
42 cubic-feet
11 sq-ft
21 cubic-feet
18 sq-ft
970 sq-ft
0.84
24 sq-ft
24 sq-ft
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMP2
Remaining DCV after implementing ret n ·
Partial Retention
3
4
4/ L. e 5
-Lin
BMP Parameters
11
13 Aggregate Storage above underdrain invert (12 inches typical)-use O inches
for sizin if the a e ate is not over the entire bottom surface area
15 Media filtration rate to be used for sizin
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option I -Biofilter I .5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0.75 ofremaining DCV in pores and ponding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculat ed
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr.
36 hours
inches
0 . in/in
inches
120 s -ft
0.1 in/in
cubic-feet
2 cubic-feet
6 hours
30 inches
14 inches
44 inches
4 cubic-feet
1 sq-ft
2 cubic-feet
1 sq-ft
575 sq-ft
0.73
13 sq-ft
13 sq-ft
• • • • • • • • • • • • • • • • • • • • •
• • • • • • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMP3
Remaining DCV after implementing retention BMPs
Partial Retention
2
3
4
5
8
9
10
BMP Parameters
11 Surface Pondin 6 inch minimum 12 inch maximum
I Media Thickness 18 inches minimum
13 Aggregate Storage above underdrain invert (12 inches typical) -use O inches
for sizin if the a
14
s
able Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option I -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0. 75 of remaining DCV in pores and ponding
22 Required Storage (surface + pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0
25
0.1
6 inches
18 inches
12 inches
0.2 in/in
5 in/hr.
6 r
30 inches
14 inches
44 inches
13 cubic-feet
3 sq-ft
6 cubic-feet
5 sq-ft
300 sq-ft
0.83
8 sq-ft
8 sq-ft
• • • • • • • • • • •
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMP4
Remaining DCV after implementing retention BMPs
Partial Retention
3
4
5
6 Line 4/ Line 5
7
8
9 /12 x Line 7
10 DCV that re uires biofiltration Line I -Line 9
BMP Parameters
11 Surface Pondin 6 inch minimum 12 inch maximum
13 Aggregate Storage above underdrain invert (12 inches typical)-use 0 inches
for sizin if the a e ate is not over the entire bottom surface area
15 Media filtration rate to be used for sizin
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option l -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0.75 ofremaining DCV in pores and ponding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0
36
0
0.4
0
70
0.1 in/in
11 cubic-feet
21 cubic-feet
h s
s
12 inches
0.2 in/in
5 in/hr.
6 hours
30 inches
14 inches
44 inches
31 cubic-feet
8 sq-ft
16 cubic-feet
13 sq-ft
782 sq-ft
0.83
19 sq-ft
19 sq-ft
• • • • •• • • • • • • • • • • • • • •
• • • • • • • • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMPS
Remaining DCV after implementin
Partial Retention
3
4
5
8
+ Lin 12 x Line 8 /12 x Line 7
BMP Parameters
11 Surface Pondin 6 inch minimum 12 inch maximum
12 Media Thickness 18 inches minimum
13 Aggregate Storage above underdrain invert (12 inches typical) -use 0 inches
for sizin if the a e ate is not over the entire bottom surface area
15 Media filtration rate to be used for sizin
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option I -Biofilter 1.5 times the DCV
20 Required biofiltered volume [ 1.5 x Line 1 0]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0.75 of remaining DCV in pores and ponding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) consta nt per BMP Design Manual
8/25/2016
0 in/hr.
36 hours
0 inches
0.4 in/in
0 inches
58 s -ft
0.1 in/in
9 cubic-feet
8 cubic-feet
6 inches
18 inches
12 inches
0.2 in/in
5 in/hr.
6 hours
30 inches
14 inches
44 inches
12 cubic-feet
3 sq-ft
6 cubic-feet
5 sq-ft
440 sq-ft
0.79
10 sq-ft
10 sq-ft
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Michael Baker
INTERNAT ION AL
BMP6
Remaining DCV after implementing retention BMPs
Partial Retention
2 Infiltration rate from Worksheet D.5-1 if artial infiltration is feasible
7 Assumed surface area of the biofiltration BMP
8
9 ine 12 x Line 8 /12 x Line 7
BMP Parameters
11 Surface Pondin 6 inch minimum 12 inch maximum
12 Media Thickness 18 inches minimum
13 Aggregate Storage above underdrain invert (12 inches typical) -use 0 inches
for sizin if the a e ate is not over the entire bottom surface area
15 Media filtration rate to be used for sizin
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option 1 -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0. 75 of remaining DCV in pores and ponding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B. l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03)
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr .
36 hours
0 inches
0.4 in/in
0 inches
415 s -ft
0.1 in/in
62 cubic-feet
119 cubic-feet
6 inches
18 inches
12 inches
0.2 in/in
5 in/hr.
6 hours
30 inches
14 inches
44 inches
178 cubic-feet
48 sq-ft
89 cubic-feet
74 sq-ft
4,525 sq-ft
0.83
112 sq-ft
112 sq-ft
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMP7
Remaining DCV after implementing retention BMPs
Partial Retention
2 Infiltration rate from Worksheet D.5-1 if artial infiltration is feasible
7 Assumed surface area of the biofiltration BMP
10 DCV that re uires biofiltration Line 1 -Line 9
BMP Parameters
11 Surface Pondin 6 inch minimum 12 inch maximum
12 Media Thickness 18 inches minimum
13 Aggregate Storage above underdrain invert (12 inches typical)-use 0 inches
for sizin if the a e ate is not over the entire bottom surface area
15 Media filtration rate to be used for sizin
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16)
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18)
Option 1 -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10)
21 Required Footprint [Line 20/ Line 19) x 12
Option 2 -Store 0.75 of remaining DCV in pores and ponding
22 Required Storage (surface + pores) Volume [0.75 x Line 10)
23 Required Footprint [Line 22/ Line 18) x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03)
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr .
36 hours
0 inches
0.4 in/in
0 inches
195 s -ft
0.1 in/in
29 cubic-feet
15 cubic-feet
6 inches
18 inches
12 inches
0.2 in/in
5 in/hr.
6 hours
30 inches
14 inches
44 inches
22 cubic-feet
6 sq-ft
11 cubic-feet
9 sq-ft
1,180 sq-ft
0.77
27 sq-ft
27 sq-ft
• • • • • • • • • • • • • • • • • • • • • • • •
• • • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMPS
Remaining DCV after implementing retention BMPs
Partial Retention
I
7
8
I XL'
0
Surface Pondin 6 inch minimum 12 inch maximum
13 Aggregate Storage above underdrain invert (12 inches typical)-use O inches
for sizin if the a e ate is not over the entire bottom surface area
14
15 Media filtration rate to be used for sizin
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16)
18 Depth of Detention Storage
Line 11 + ine 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18)
Option 1 -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line IO]
21 Required Footprint [Line 20/ Line 19) x 12
Option 2 -Store 0.75 ofremaining DCV in pores and ponding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10)
23 Required Footprint [Line 22/ Line 18) x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03)
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr.
36 hours
0 inches
0.4 in/in
0
s
18 inches
12 inches
0.2 in/in
5 in/hr.
6 hours
30 inches
14 inches
44 inches
5 cubic-feet
1 sq-ft
2 cubic-feet
2 sq-ft
447 sq-ft
0.74
10 sq-ft
10 sq-ft
• • • • • • • • • • • • •
• • • • • • • • • • •
•
• • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMP9
Remaining DCV after implementing retention BMPs
Partial Retention
2 Infiltration rate from Worksheet D.5-1 if artial infiltration is feasible
6
7 Assumed surface area of the biofiltration BMP
8
9 /12 x Line 7
10 DCV that re uires biofiltration Line I -Line 9
BMP Parameters
11 Surface Pondin 6 inch minimum 12 inch maximum
12 Media Thickness 18 inches minimum
13 Aggregate Storage above underdrain invert ( 12 inches typical) -use 0 inches
for sizin if the a e ate is not over the entire bottom surface area
15 Media filtration rate to be used for sizin
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option l -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0. 75 of remaining DCV in pores and ponding
22 Required Storage (surface + pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21 , Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr.
36 hours
0 inches
0.4 in/in
0 inches
83 s -ft
0.1 in/in
12 cubic-feet
44 cubic-feet
6 inches
18 inches
12 inches
0.2 in/in
5 in/hr.
6 hours
30 inches
14 inches
44 inches
66 cubic-feet
18 sq-ft
33 cubic-feet
28 sq-ft
1,375 sq-ft
0.85
35 sq-ft
35 sq-ft
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMPlO
Partial Retention
3
4
5
6 Line 4/ Line 5
8
10 DCV that re uires biofiltration Line I -Line 9
BMP Parameters
11 Surface Pondin 6 inch minimum 12 inch maximum
12 Media Thickness 18 inches minimum
13 Aggregate Storage above underdrain invert ( 12 inches typical) -use O inches
for sizin if the a e ate is not over the entire bottom surface area
Baseline Calculations
1 ble tin T fi si ·
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option I -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0.75 of remaining DCV in pores and ponding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line I 8] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr.
36 hours
0 inches
0.4 in/in
0 inches
90 s -ft
0.1 in/in
14 cubic-feet
25 cubic-feet
s
12 inches
0.2 in/in
5 in/hr.
s
30 inches
14 inches
44 inches
38 cubic-feet
10 sq-ft
19 cubic-feet
16 sq-ft
970 sq-ft
0.83
24 sq-ft
24 sq-ft
• • • • • • • • • • • • • • • • • • • • • • • •
• • • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMP 11
Partial Retention
2
3
4
5
6 ine 4/ Line 5
7 Assumed surface area of the biofiltration BMP
8
10 DCV that re uires biofiltration Line I -Line 9
BMP Parameters
11
12
13 Aggregate Storage above underdrain invert ( 12 inches typical) -use O inches
for sizin if the a e ate is not over the entire bottom surface area
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
ine 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option 1 -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0.75 of remaining DCV in pores and ponding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr.
36 hours
0 inches
0.4 in/in
0 inches
32 s -ft
0.1 in/in
t
14 et
s
12
6 hours
30 inches
14 inches
44 inches
20 cubic-feet
5 sq-ft
10 cubic-feet
8 sq-ft
450 sq-ft
0.84
11 sq-ft
11 sq-ft
• • • • • • • • • • • • • • • • • • • • • • • • • • •
•
• • • • • • • • • • • •
Michael Baker
I NTERNATIONAL
BMP12
Remaining DCV after implementing retention BMPs
Partial Retention
2 Infiltration rate from Worksheet D.5-1 if artial infiltration is feasible
7 Assumed surface area of the biofiltration BMP
8
10 DCV that re uires biofiltration Line 1 -Line 9
BMP Parameters
11 Surface Pondin 6 inch minimum 12 inch maximum
e ate is not over the entire bottom surface area
ed fir 1n
Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + ine 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option 1 -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0.75 of remaining DCV in pores and ponding
22 Required Storage (surface + pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line I 8] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B. l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr.
36 hours
0 inches
0.4 in/in
0 inches
s -ft
0.1 in/in
14 cubic-feet
cubic-feet
1 C s
18 inches
12 inches
0.2 in/in
5 in/hr.
6 hours
30 inches
14 inches
44 inches
99 cubic-feet
27 sq-ft
49 cubic-feet
41 sq-ft
1,910 sq-ft
0.86
49 sq-ft
49 sq-ft
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
• • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMP13
Partial Retention
2
3
7 Assumed surface area of the biofiltration BMP
8
L. 7
BMP Parameters
13 Aggregate Storage above underdrain invert (12 inches typical) -use O inches
for sizin if the a e ate is not over the entire bottom surface area
15 Media filtration rate to be used for sizin
Baseline Calculations
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + ine 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option I -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0. 75 of remaining DCV in pores and ponding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B. l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
3 o r
178
0.1 in/in
27 cubic-feet
88 cubic-feet
C S
ch s
12 inches
0.2 in/in
5 in/hr.
ours
30 inches
14 inches
44 inches
131 cubic-feet
35 sq-ft
66 cubic-feet
55 sq-ft
2,785 sq-ft
0.85
71 sq-ft
sq-ft
• • • • • • • • • • • • • • • • • • • • • •
• • • • • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMP 14
Remaining DCV after implementing retention BMPs
Partial Retention
3
4
5
6 Line 4/ Line 5
7
8
9 /12 x Line 7
10 DCV that re uires biofiltration Line I -Line 9
BMP Parameters
11 Surface Pondin 6 inch minimum, 12 inch maximum
13 Aggregate Storage above underdrain invert (12 inches typical) -use 0 inches
for sizin if the a e ate is not over the entire bottom surface area
15 Media filtration rate to be used for sizin
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16)
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18)
Option I -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10)
21 Required Footprint [Line 20/ Line 19) x -12
Option 2 -Store 0. 75 of remaining DCV in pores and ponding
22 Required Storage (surface + pores) Volume [0.75 x Line 10)
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B. l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03)
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr.
36 hours
0 inches
0.4 in/in
0 inches
40 s -ft
0.1 in/in
6 cubic-feet
41 cubic-feet
6 inches
18 inches
12 inches
0.2 in/in
5 in/hr.
6 hours
30 inches
14 inches
44 inches
62 cubic-feet
17 sq-ft
31 cubic-feet
26 sq-ft
1,127 sq-ft
0.87
29 sq-ft
29 sq-ft
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Michael Baker
INTERNATIONAL
BMP15
Partial Retention
3
4
5
6 Line 4/ Line 5
7 Assumed surface area of the biofiltration BMP
8
10 DCV that re uires biofiltration Line I -Line 9
BMP Parameters
11 Surface Pondin 6 inch minimum 12 inch maximum
12 Media Thickness 18 inches minimum
13 Aggregate Storage above underdrain invert ( 12 inches typical) -use O inches
for sizin if the a e ate is not over the entire bottom surface area
15 Media filtration rate to be used for sizin
Baseline Calculations
16 Allowable Routin Time for sizin
17 Depth filtered during storm [ Line 15 x Line 16]
18 Depth of Detention Storage
Line 11 + Line 12 x Line 14 + Line 13 x Line 5
19 Total Depth Treated [Line 17 + Line 18]
Option 1 -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10]
21 Required Footprint [Line 20/ Line 19] x 12
Option 2 -Store 0. 75 of remaining DCV in pores and ponding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10]
23 Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
24 Area draining to the BMP
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B. l and B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
27 Footprint ofBMP = Maximum(Minimum(Line21, Line 23,), Line26)
manual input
calculated
(no fill) constant per BMP Design Manual
8/25/2016
0 in/hr.
36 hours
0 inches
0.4 in/in
0 inches
40 s -ft
0.1 in/in
6 cubic-feet
12 cubic-feet
6 inches
18 inches
12 inches
0.2 in/in
5 in/hr.
6 hours
30 inches
14 inches
44 inches
18 cubic-feet
5 sq-ft
9 cubic-feet
8 sq-ft
454 sq-ft
0.83
11 sq-ft
11 sq-ft
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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)
N/A See Hydromodification Management
Exhibit Checklist on the back of this
Attachment cover sheet.
Attachment 2b Management of Critical Coarse 00 Exhibit showing project
Sediment Yield Areas (WMAA Exhibit drainage boundaries marked on
is required, additional analyses are WMAA
optional) Critical Coarse Sediment Yield
Area Map (Required)
See Section 6.2 of the BMP Design
Manual. Optional analyses for Critical Coarse
Sediment Yield Area Determination
D 6.2.1 Verification of Geomorphic
Landscape Units Onsite
D 6.2.2 Downstream Systems
Sensitivity to Coarse Sediment
D 6.2.3 Optional Additional
Analysis of Potential Critical
Coarse
Attachment 2c Geomorphic Assessment of Receiving D Not performed
Channels (Optional) D Included N/A
See Section 6.3.4 of the BMP Design
Manual.
Attachment 2d Flow Control Facility Design and D Included
Structural BMP Drawdown
N/A Calculations (Required) n/a
See Chapter 6 and Appendix G of the
BMP Design Manual
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Use this checklist to ensure the required information has been included on the
Hydromodification Management Exhibit:
N/A
The Hydromodification Management Exhibit must identify:
D 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)
D Existing topography
D Existing and proposed site drainage network and connections to drainage offsite
D Proposed grading
D Proposed impervious features
D 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)
D Structural BMPs for hydromodification management (identify location, type of BMP, and
size/detail)
• • • • • • • • • • • • • • • • • • • • • • •
•
• •
• • • • • • • • • • • •
Carlsbad WMA Water Quality Improvement Plan
2.3.4.1 Watershed Management Area Analysis
All of the Carlsbad WMA Responsible Agencies have participated in the development of a Watershed
Management Area Analysis (WMAA} -see Appendix E. The purpose of the WMAA is to:
1) Characterize the WMA through identification of physical characteristics and compilation of the
data into Geographical Information System (GIS} mapping;
2) Use the WMA characterization as a resource for identification of potential candidate projects for
Offsite Alternative Compliance (OAC) options for fulfilling applicable Land Development
requirements of the MS4 permit;
3) Use the WMA characterization as a resource for identifying areas within the WMA where
exemptions from hydromodification management requirements would be appropriate .
Characterization
The attached Carlsbad WMAA provides GIS mapping that characterize the WMAs by providing the
following:
1) Description of dominant hydrologic processes, such as areas where infiltration or overland flow
likely dominates;
2) Description of existing streams in the watershed, including bed material and composition, and if
they are perennial or ephemeral;
3) Current and anticipated future land uses;
4) Potential coarse sediment yield areas; and
5} Locations of existing flood control structures and channel structures, such as stream armoring,
constrictions, grade control structures, and hydromodification or flood management basins .
Of/site Alternative Compliance
Completion of a WMAA is a required step prior to allowing Offsite Alternative Compliance (OAC} as an
option for development/redevelopment projects. Although the WMAA has been completed, Responsible
Agencies have not yet developed OAC programs. It is anticipated that those Responsible Agencies that
elect to have OAC programs will develop and implement those programs in the coming years and are
identified in the optional strategies in each focus area where applicable.
The Responsible Agencies are also required to develop a list of candidate projects that could potentially
be used as alternative compliance options in lieu of land development onsite structural BMP performance
requirements. The current candidates list is provided as Appendix F. Since the Responsible Agencies are
not intending to implement OAC programs until 2016 at the earliest, the candidates list is currently not
comprehensive and is anticipated to be amended in coming years.
Exemptions from Hydromodification Management Requirements
e inc u es a escnptIon o t e recommen e exemptions from hydro modification management
requirements as summarized below. Future proposed Hydromodification Management Plan exemptions
would need to be approved through the WQIP Annual Update process .
1} Exempt River Reaches
There are no river reaches currently recommended for exemption from hydromodification
management requirements in the Carlsbad WMA. However, Escondido Creek is currently being
evaluated to assess whether a hydromodification management exemption could apply to this
waterbody. Based on the findings of the evaluation, the San Elijo Lagoon may also be evaluated. The
results of these studies will be included in future Carlsbad WMAA updates .
2) Stabilized Conveyance Systems Draining to Exempt Water Bodies
There are no stabilized conveyance systems currently recommended for exemption from
hydromodification management requirements in the Carlsbad WMA .
Strategies
21
• • • • • • • • • • • • • • • • • • • • • • •
•
•
• • •
• • • • • • • • •
Carlsbad WMA Water Quality Improvement Plan
3) Highly Impervious/Highly Urbanized Watersheds and Urban Infill
No areas within the Carlsbad WMA are currently recommended for highly impervious/highly
urbanized watershed or urban infill exemption.
4) Tidally Influenced Lagoons
Based on a City of Carlsbad study5, there are several tidally influenced areas recommended for
exemption including:
a. Areas tributary to Buena Vista Lagoon .-~-------
b. Several tributary areas to Agua Hedionda Lagoon
c. One tributary area to Batiquitos Lagoon
The San Elijo Lagoon and other tidally influenced waterbodies may also be evaluated for exemption
in future analyses .
5 Hydromodification Exemption Analyses for Select Carlsbad Watersheds, Chang Consultants (September 11, 2015)
Strategies
22
• • • • • • • • • • • • • • • • • • • • • • •
• • •
• • • • • • • • • • • •
HYDROMODIFICATION EXEMPTION MAP
(Per County of San Diego Google Earth KMZ file)
-Exempt Water Body
• • • • • • • •
• • • • • • • • • • • •
•
• • • • • • • • • • • • • • • •
ATTACHMENT 26
CCSYAMAP
Ocean Condominiums
SWQMP
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
CCSVA MAP
(Per County of San Diego Google Earth KMZ file)
-CCSYA (none present)
--------------------~-----·····
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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:
D 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:
D 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)
D How to access the structural BMP(s) to inspect and perform maintenance
D 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)
D Manufacturer and part number for proprietary parts of structural BMP(s) when
applicable
D 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.)
D Recommended equipment to perform maintenance
D When applicable, necessary special training or certification requirements for
inspection and maintenance personnel such as confined space entry or
hazardous waste management
------------------------------------,,,,,,,,,,,,,,,,,,,, ___ ,, ______ ,~,
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Bioflltration Area -Maintenance
The primary maintenance requirement for bioretention areas is that of inspection and repair or
replacement of the treatment area's oomponents. Generally, this involves nothing more than the
routine periodic maintenance that is required of any landscaped area. Plants that are
appropriate for the site, climatic, and watering conditions should be selected for use in the
bioretention cell. Appropriately selected plants will aide in reducing fertilizer, pesticide, water,
and overall mainterumce requirements. Bioretention system components should blend over
time through plant and root growth, organic decomposition, and the development of a natural
soil horizon. These biologic and physical processes over time will lengthen the facility's life span
and reduce the need for extensive maintenance.
Routine maintenance should include a biannual health evaluation of the trees and shrubs and
subsequent removal of any dead or diseased vegetation (EPA. 1999). Diseased vegetation
should be treated as needed using preventative and low-toxic measures to the extent possible.
BMPs have the potential to create very attractive habitats for mosquitoes and other vectors
beoluse of highly organic, often heavily vegetated areas mixed with shallow water. Routine
in.,;J:'P"finrut fnr An>A~ nf ~Anmng wAtPr '-lrithit1 thP RMP nnd m1't'N':tivP. mr.1uml"f'.8 tn re,;tnre
proper infiltration rates are necessary to prevent creating m05quito and other vector habitat. In
addition, bioretention BMPs are susceptible to invasion by aggressive plnnt specie; such as
cattails, which increase the chances of water standing and subsequent vector production if not
routinely maintained.
In order to maintain the treatment area·s appearance it may be necessary to prune and weed.
Furthermore, mulch replacement is suggested when erosion is evident or when the site begins to
look unattractive. Specifically, the entire area may require mulch replacement every two to
three years, although spot mulching may be sufficient when there are random void areas. Mulch
replacement should be done prior to the start of the wet season.
New Jersey's Depanment of Environmental Protection states in their bioretention systems
staudards that accumulated sediment and debris re111oval (especially at t11e inflow point) will
normally be the primary maintenance function. Other potential tasks include replacement of
dead vegetation, soil pH regulation, erosion repair at inflow points, mulch replenishment,
uucluggwg Lh~ uutrertlrctiu, am.I t~pairiug uv~rOuw blnn~lurns. 'l'hl!t'I:! 1s wsu llll:! pus1,alnhly Urnl
the cation exchange capacity of the soils in the cell ~Il be significantly reduced over time.
Depending on pollutant loads, soils may need to be teplared within 5-10 years of construction
(LID, 2000).
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l\lainteuace Prop-am fo1· Bioretentton Area
Inspection Frequency/lndkattons:
l\laintemce laclk•tions CoD11edioas
a Damage to inlet/outlet, side slopes, headwall, or
other structures
0 Over-grown vegetation. emergent woody
vegetation and/or weeds
0 Sediment accumulation over 3 inches
0 Tash, ~ and vegetative litter a Rodents or other vectors
Waste Disposal
Regular Inspections
0 Before wet season begins (Septftnba);
0 Evny 60 days during wet season (September-
April);
a After wet season (April).
Prcfimpaocr lulPecriOPS
0 After rainfall events greater than 0.5 inch
l\laillteuac:e Activities CoDlledions
a Repair inlet/outlet s1Iuctures, side slopes,
fcoces, or other structural elements as needed to
maintain perlormance of the facility.
0 Trim vegetation to average height of 12 inches
and remove trimmings.
a Remove emergent trees and other 1,-egetation
that are not part ofbioretention basin plan and
weeds a Re-seed and re-plan barren areas prior to rainy
season a Install erosion blanket on baaen spots if re-
vegetation is not successful
a Remove sediment accumulation at or near plant
a Abate and conttol rodents as necessaiy to
maintain performance of the facility
a Drain slmding water
Sediment, other pollutants, and all other waste shall
be properly disposed of in a licensed landfill or by
another appropriate disposal method in accordance
with local. state, and federal regulations.
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Pervious Pavement -Maintenance
rrable 1 Typical Reaxnmendacl Maintenance Reoimes
Adiwlty Sehednle
• Minimize use of salt or grit for de-icing
• Keep landscaped areas well maintained Ongoing
• Prevent BOil being washed onto pavement
• Vacuum clean surfatt using oommercially 8Vllilable sweeping
DUlt"JrinCO Qt the followiJlS tinlCG:
-End of winter (April) 2/3 xperyear
-Mid-summer (July/ August)
-After Autunm leaf-fall (November)
• Inspect outlets Amma]
• If routine cleaning does not restore infiltration rates, then
reconstmction of part of the whole of a perviQus surface may be
required.
• The surface area aft'ected by hydraulic failure should be lifted for
inspection of the intemal materials to identify the ~atiot1 and As needed(infrequent) extent of the blockage. Maximum 15-20 years • Surface materials should be lifted and replaced aft:eJ, brw;h
cleaning. Geotextiles may need complete replacement.
• Sub--surtare layers may need cleamng and replaemg .
• Removed silts may need to be di5posed of as oontrolled waste .
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ATTACHMENT 4
City standard Single Sheet BMP (SSBMP) Exhibit
[Use the City's standard Single Sheet BMP Plan.]
To be provided at construction drawing phase.