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1
CITY OF CARLSBAD --·
PRIORITY DEVELOPMENT PROJECT (PDP)
STORM WATER QUALITY MANAGEMENT PLAN (SWQMP)
FOR
KAISER CARLSBAD PARKING LOT EXPANSION
DWG 504-2A
CD 2017-0003 I GR2017-0030 I DEV2017-0024
ENGINEER OF WORK:
GREGP . LANG, P.E. RCE 68075
PASCO LARET SUITER & ASSOCIATES, INC.
535 N. HIGHWAY 101, SUITE A
SOLANA BEACH, CA 92075
PREPARED FOR:
KAISER PERMANENTE
6860 Avenida Encinas
Carlsbad, CA 92011
619-528-5000
PREPARED BY:
PASCO LARET SUITER
& ASSOCIATES
CIVIL ENGINEERING+ LAND PLANNING t LANO SURVEYING
6-14-2017
EXP: 06-30-19
...J
~ I--~ m :::,
535 N. HIGHWAY 101 , SUITE A
SOLANA BEACH, CA 92075
858-259-8212
DATE: RECEIVED ~
JUNE 14, 2017 AUG 14 2018 <(
LAND DEVELOPMENT~
ENGINEERING LL
STORM WATER QUALITY MANAGEMENT PLAN
TABLE OF CONTENTS
ENGINEER'S CERTIFICATION
PROJECT VICINITY MAP
STORM WATER STANDARD QUESTIONNAIRE
SITE INFORMATION
SUMMARY OF PDP STRUCTURAL BMPs
ATTACHMENT 1 -Backup for PDP Pollutant Control BMPs
JUNE 2017
Attachment I a ......................................................................................................... DMA Exhibit
Attachment I b ............... Tabular Summary of DMAs and Design Capture Volume Calculations
Attachment I c .................................................................. Harvest and Use Feasibility Screening
Attachment Id .............................................. Categorization of Infiltration Feasibility Condition
Attachment 1 e ................................... Pollutant Control BMP Design Worksheets / Calculations
ATTACHMENT 2 -Backup for PDP Hydromodification Control Measures
Attachment 2a ................................................................. Hydromodiftcation Exemption Exhibit
Attachment 2b ....................................... Potential Critical Coarse Sediment Yie ld Areas Exhibit
Attachment 2c ................................................................................ Flow Control Facil ity Design
ATTACHMENT 3-Structural BMP Maintenance Plan
Attachment 3a ...... Structural BMP Maintenance Thresholds and Actions and BMP Fact Sheets
Attachment 3b .............................................................................. Draft Maintenance Agreement
ATTACHMENT 4 -City of Carlsbad Standard Single Sheet BMP Exhibits
Attachment 4a ................................................................. Single Sheet BMP Exhibit
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
2
STORM WATER QUALITY MANAGEMENT PLAN
CERTIFICATION PAGE
Project Name: Kaiser Permanente Carlsbad -Parking Lot Expansion
Project ID:
JUNE 2017
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.
G~n~;'fr RCE 68075
Pasco Laret Suiter & Associates
535 N. Highway 101 , Suite A
Solana Beach, CA 92075
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
3
06/1 4/17
Exp: 06-30-19 Date
STORM WATER QUALITY MANAGEMENT PLAN
CITY OF OCEANSIDE
PACIFIC
OC EAN
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
CITY OF ENCINITAS
Figure 1 -Vicinity Map
4
JUNE 2017
CITY OF VISTA
VICINITY MAP
N.T.S.
l_ City of
Carlsbad
STORM WATER STANDARDS
QUESTIONNAIRE
E-34
Dg_ve/opment Services
Land Development Engineering
1635 Faraday Avenue
(760) 602-2750
www.carlsbadca.gov
½ INSTRUCTIONS:
T
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 inco rrectly 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
11.pROJECT NAME: Kaiser Carlsbad Parking Lot Expansion PROJECT ID: DWG 504-2A /<-f>'l,ot1-ooo.
•ADDRESS: 6860 Avenida Encinas APN : 214-450-19-00
he project is (check one): D New Development Ill Redevelopment
"" 20,962 0.48 The total proposed disturbed area is: ft2 ( ) acres
,..fhe total proposed newly created and/or replaced impervious area is: 13,404 ft2 ( 0.31 ) acres
If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the
:,WQMP # of the larger development project:
.. Project ID CD2017-0003 /Pw6' t;o~ -~,4 SWQMP#:
r-£hen, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your
pplication to the city.
•
E-34 Page 1 of 4 REV 02/16
STEP1
TO BE COMPLETED FOR ALL PROJECTS
To determine if your project is a "development project", please answer the following question:
Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building
or stnir.hm~ that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)?
YES NO
•
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):
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:
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;
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 uidance?
YES NO
•
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):
E-34 Page 2 of 4 REV 02116
8TIP3
TO IE COMPtlTl!D FOR ALL NEW OR REDiYILOPMINT PROJICT8
To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1 )):
YES NO
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,
and ublic develo ment ro ·ects on ublic or rivate land.
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
more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public
develo ment ro ·ects on ublic or rivate land.
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
Classification SIC code 5812 .
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
develo ment ro·ect includes develo ment on an natural slo e that is twent -five ercent or reater.
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
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
freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface
used for the trans ortation of automobiles, trucks, motorc cles, and other vehicles.
7. Is your project a new or redevelopment project that creates and/or replaces 2,500 square feet or more
of impervious surface collectively over the entire site, and discharges directly to an Environmentally
Sensitive Area (ESA)? "Discharging Directly to" includes flow that is conveyed overland a distance of
200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an
isolated flow from the ro ·ect to the ESA i.e. not commin led with flows from ad·acent 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
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
RGO's that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily
Traffic ADT of 100 or more vehicles er da .
•
•
•
Ill
•
•
•
10. Is your project a new or redevelopment project that results in the disturbance of one or more acres of land D
and are expected to generate pollutants post construction?
•
•
Ill
•
•
Ill
Ill
Ill
Ill
121 ~ 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
21 .203.040
If you answered "yes" to one or more of the above questions, your project is a PDP. If your project is a redevelopment
project, go to step 4. If your project is a new project, go to step 5, check the first box stating "My project is a PDP ... "
and complete applicant information.
If you answered "no" to all of the above questions, your project is a 'STANDARD PROJECT.' Go to step 5, check the
second box statin "M ro·ect is a 'STANDARD PROJECT' ... " and com lete a licant information.
E-34 Page 3 of 4 REV 02/16
STEP4
TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP)
ONLY
Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3.b.(2)):
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) = ___ +_l_-9_1_·_18_7 ______ sq. ft.
Total proposed newly created or replaced impervious area (B) = ___ 13_,_4o_4 _______ sq. ft.
Percent impervious area created or replaced (B/A)*100 = _14_·_7 ___ %
YES NO
lll •
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 statin "M ro·ect is a PDP ... " and com lete a licant information.
STEPS
CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION
IZI 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.
• 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.
D My Project is NOT a 'development project' and is not subject to the requirements of the BMP Manual.
Applicant Information and Signature Box
Applicant Name: Gregory W. Lang Applicant Title: _P_._E_. ,_P_r_in_c_ip_a_l _________ _
Date: lu/tAf (J
• Environmentally Sensitive Areas include b are not lln,lted to all Cle Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special
Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies
designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and
amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and County of San Diego; Habitat
Management Plan: and any other equivalent environmentally sensitive areas which have been identified by the City.
This Box for City Use Onlv
YES NO
City Concurrence: • •
By:
Date:
Project ID:
E-34 Page 4 of 4 REV 02/16
STORM WATER QUA LITY MA NAGEMENT PLAN JUNE 2017
SITE INFORMATION CHECKLIST
Project Summary Information
Project Name Ka iser Carlsbad Parking Lot Expansion
Project ID C D2017 -0003
Project Address 6860 Avenida Encinas
Carlsbad, CA 92009
Assessor's Parcel Number(s) (APN(s)) 214-450-19-00
Hydrologic Unit: Carlsbad
Hydrologic Area: San Marcos
Hydrologic Sub-Area Name: Batiquitos
Project Watershed (Hydrologic Unit) Hydrologic Sub-Area#: 904.51
Watershed: San Marcos Creek-Frontal Gulf of
Santa Catalina
Subwatershed: San Marcos Creek
Parcel Area 3.16 Acres ( ±137,650 Square Feet)
Existing Impervious Area
( +91,187 (subset of Parcel Area) ±2.1 Acres Square Feet)
Area to be disturbed by the project
0.48 Acres ( 20,962 Square Feet) (Project Area)
Project Proposed Impervious Area
0.31 Acres ( 13,404 Square Feet) (subset of Proiect Area)
Project Proposed Pervious Area (incl uding
0.17 Acres ( 7 558 Square Feet) D.G., Deminimus, and Self-Mitiaatina Area)
Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the
Project.
This mav be less than the Parcel Area.
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
5
STORM WATER QUAl/TY MANAGEMENT PLAN
Description of Existing Site Condition and Drainaae Patterns
Current Status of the Site (select all that apply):
!Bl Existing development
Previously graded but not built out
Agricultural or other non-impervious use
Vacant, undeveloped/natural
Description/ Additional Information:
JUNE 2017
The existing site is comprised of two (2) medical office buildings and an elevator/stair building,
with an interior courtyard between the buildings. To the north and south of the existing bui ldings
are patient and staff parking lots, respectively. The Avenida Encinas frontage of the site is
parkway landscaping with an open landscape area in front of building 'B.' (See further
discussion below on site topograghy and drainage).
Existing Land Cover Includes (select all that apply):
(gJ Vegetative Cover
Non-Vegetated Pervious Areas
!Bl Impervious Areas
Description/ Additional Information: See discussion above regarding the current status of the
site.
Underlying Soil belongs to Hydrologic Soil Group (select all that apply):
NRCS Type A
~ NRCS Type B (99.5% Per NRCS Custom Soil Resource Report for 6860 Avenida Encinas)
NRCS Type C
[g]NRCS Type D (0.5% Per NRCS Custom Soil Resource Report for 6860 Avenida Encinas)
Approximate Depth to Groundwater (GW):
GW Depth < 5 feet
5 feet < GW Depth < 10 feet
10 feet < GW Depth < 20 feet
[g]GW Depth> 20 feet (Groundwater not encountered during Geotechnical Investigation)
Existing Natural Hydrologic Features (select all that apply):
Watercourses
Seeps
Springs
Wetlands
(gJ None
Description/ Additional Information: N/A
KA ISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
6
STORM WATER QUALITY MANAGEMENT PLAN JUNE 20 17
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]:
The existing site drainage conveyance for the project site is urban, with area drains located
throughout the site in landscape planter areas and in strategic parking lot locations to drain
hardscape areas. The northerly parking lot area on the site drains to the NW corner of the
parking lot and outlets via surface drainage to the Avenida Encinas right-of-way.
Offsite drainage from the Caltrans right-of-way to the directly east of the site is conveyed
through the project site via an underground 18" RCP storm drain. Just before reaching Avenida
Encinas the 18" RCP confluences at a Type A-4 Cleanout with a 12" PVC storm drain from the
southerly parking area and then continues to the west across Avenida Encinas.
Flow then continues north along Avenida Encinas for a short distance where the storm drain
then turns west into Poinsettia Properties, Planning Area 5 (Ref. C.O.C. DWG 378-9), and then
to Poinsettia Properties, Planning Areas 2, 3, &4 (Ref. C.O.C. DWG 396-7), via increasingly
larger storm drain piping until a 60" RCP outlets to an existing 72" RCP storm drain within the
San Diego Northern Railway right-of-way. This large main trunk line storm drain continues
southerly in the railroad right-of-way and then along N. Coast Hwy 101 for a total of
approximately 1 mile until its ultimate outlet via an 84" RCP storm drain to a rip-rap energy
dissipater at Batiquitos Lagoon. (Ref. C.O.C. DWGs 399-7 and 337-9).
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
7
STORM WATER QUALITY MANAGEMENT PLAN JUNE20l 7
Description of Proposed Site Development and Drainaae Patterns
Project Description / Proposed Land Use and/or Activities:
The project site is located at Latitude 33°06'27"N and Longitude 117°18'52"W and has a total
area of 3.16 acres. The surrounding area has been developed and is comprised of existing
commercial uses to the north and south. Interstate 5 is directly east of the project with Avenida
Encinas directly west of the site and existing residential just west of Avenida Encinas. The
project site land use will remain unchanged in the proposed condition.
For the proposed condition, portions of the existing landscape area will be removed and
replaced with asphalt parking area and a sidewalk connection added for pedestrian access to
the Avenida Encinas right-of-way sidewalk. Storm water from the newly created impervious
area will be treated via biofi ltration BMPs along the project street frontage and be connected to
the existing site storm drain. Associated utilities for the site parking area w ill also be installed, as
necessary. Total disturbed area is 0.48 acres.
List/describe proposed impervious features of the project (e.g., buildings, roadways, parking
lots, courtyards, athletic courts, other impervious features):
For the proposed condition, portions of the existing landscape area will be removed and
replaced with asphalt parking area and a sidewalk connection added for pedestrian access to
the Avenida Encinas right-of-way sidewalk. The proposed project's drainage infrastructure will
not signifi cantly alter the existing site's drainage patterns on-site or discharge points.
List/describe proposed pervious features of the project (e.g., landscape areas):
Pervious areas of the proposed improvements include the addition of parking area trees and
landscaping along the project frontage, including the addition of required BMPs for stormwater
quality as presented in this report.
Does the project include grading and changes to site topography?
~ Yes • No
Description / Additional Information:
The project will include precise grading for placement of pavement for parking, driveways and
pedestrian access throughout the site.
KA ISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
8
STORM WATER QUA LJTY MANAGEMENT PLAN
Does the project include changes to site drainage (e.g., installation of new storm water
conveyance systems)?
~ Yes • No
Description/ Additional Information:
JUNE 2017
Storm water from the newly created impervious area will be treated via biofiltration BMPs along
the project street frontage and be connected to the existing site storm drain on site. Runoff from
the new impervious area will drain via sheet flow to one of two (2) BMPs located along the
project frontage. The new parking area and sidewalk areas (OMA 1) will drain via overland flow
(gutters, and concrete swale) to the larger BMP. And at the southerly end of the parking lot,
where the new parking area entrance and 2 parking stalls are proposed (OMA 2), a trench drain
has been added to capture flow from these areas and direct it to the smaller BMP at the project
frontage. The outlet of the larger BMP will be an 18" RCP, connecting to a proposed re-built
cleanout, while the smaller BMP will outlet to an 8" PVC pipe and connect to the existing 12"
PVC storm drain from the parking lot.
Identify whether any of the following features, activities, and/or pollutant source areas will be
present (select all that apply):
~ On-site storm drain inlets • Interior floor drains and elevator shaft sump pumps • Interior parking garages • Need for future indoor & structural pest control
~ Landscape/Outdoor Pesticide Use • Pools, spas, ponds, decorative fountains, and other water features • Food service • Refuse areas • Industrial processes • Outdoor storage of equipment or materials • Vehicle and Equipment Cleaning • Vehicle/Equipment Repair and Maintenance • Fuel Dispensing Areas • Loading Docks • Fire Sprinkler Test Water • Miscellaneous Drain or Wash Water
~ Plazas, sidewalks, and parking lots
KAISER PERMANENT£ CARLSBAD
PARKING LOT EXPANSION
9
STORM WATER QUA LITY MANAGEMENT PLAN JUNE 2017
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):
The outlet of the larger BMP will be an 8" PVC, connecting to a proposed re-built cleanout, while
the smaller BMP will outlet to an 8" PVC pipe and connect to the existing 12" PVC storm drain
from the southern parking lot confluencing at the Type A-4 Cleanout with a 12" PVC storm drain
from the southerly parking area and then continues to the west across Avenida Encinas via 18"
RCP storm drain. Flow then continues north along Avenida Encinas for a short distance where
the storm drain then turns west into Poinsettia Properties, Planning Area 5 (Ref. C.O.C. DWG
378-9), and then to Poinsettia Properties, Planning Areas 2, 3, &4 (Ref. C.O.C. DWG 396-7), via
increasingly larger storm drain piping until a 60" RCP outlets to an existing 72" RCP storm drain
within the San Diego Northern Railway right-of-way. This large main trunk line storm drain
continues southerly in the railroad right-of-way and then along N. Coast Hwy 101 for a total of
approximately 1 mile until its ultimate outlet via an 84" RCP storm drain to a rip-rap energy
dissipater at Batiquitos Lagoon. (Ref. C.O.C. DWGs 399-7 and 337-9).
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
None
Identification of Project Site Pollutants
Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see
BMP Desiqn Manual Annendix B.6):
Not Applicable to
Pollutant the Proiect Site
Sediment
Nutrients
Heavy Metals
Organic Compounds X
Trash & Debris
Oxygen Demanding
Substances
Oil & Grease
Bacteria & Viruses X
Pesticides
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
Also a Receiving
Anticipated from the Water Pollutant of
Proiect Site Concern
X N/A
X N/A
X N/A
X N/A
X N/A
X N/A
X N/A
JO
STORM WATER QUALITY MANAGEMENT PLAN JUNE 2017
Hvdromodification Manaaement ReQuirements
Do hydromodification management requirements apply (see Section 1.6 of the BMP Design
Manual)?
Yes, hyd romodification management flow control structural BMPs required.
~ No, the project will discharge runoff directly to existing underground storm drains discharging
directly to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean.
No, the project will discharge runoff directly to conveyance channels whose bed and bank are
concrete-lined all the way from the point of discharge to water storage reservoirs, lakes,
enclosed embayments, or the Pacific Ocean.
No, the project will discharge runoff directly to an area identified as appropriate for an
exemption by the WMAA for the watershed in which the project resides.
Descri ption/ Additional Information (to be provided if a 'No' answer has been selected above):
The drainage from th is project site is conveyed via underground storm drain pipe from the point
of discharge until it outlets at Batiquitos Lagoon, an enclosed embayment, which is included in
the Carlsbad Watershed Management Area Water Quality Improvement Plan (WQIP), dated
June 2016, as an exempt water body. Within the Carlsbad WQIP, reference Appendix F
entitled, "Hydromodification Exemption Analyses for Select Ca rlsbad Watersheds" by Chang
Consultants dated September 17, 2015. The HMP Exemption Exhibit from this report is
included as Attachment 2a for reference , and highlights the project site shown within the HMP
exemption area.
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
II
STORM WATER QUALITY MANAGEMENT PLAN JUNE 2017
Critical Coarse Sediment Yield Areas*
*This Section onlv reauired if hydromodification manaaement reauirements apply
Based on the maps provided within the WMAA, do potential critical coarse sediment yield areas
exist within the project drainage boundaries?
Yes (See discussion below)
00 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?
6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite
6.2.2 Downstream Systems Sensitivity to Coarse Sediment
6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite
No optional analyses performed, the project will avoid critical coarse sediment yield areas
identified based on WMM maps
If optional analyses were performed, what is the final result?
No critical coarse sediment yield areas to be protected based on verification of GLUs onsite
Critical coarse sediment yield areas exist but additional analysis has determined that
protection is not required. Documentation attached in Attachment 2B of the SWQMP.
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:
See Attachment 2b for a Potential Critical Coarse Sediment Yield GIS overlay of the project
area and surrounding areas.
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
12
STORM WATER QUALITY MANAGEMENT PLAN JUNE 20/7
Flow Control for Post-Project Runoff"'
*This Section only required if hydromodification management requirements apply
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.
*Hydromodification management requirements do not apply. See discussion on page 11 .
Has a geomorphic assessment been performed for the receiving channel(s)?
No, the low flow threshold is 0.1 Q2 (default low flow threshold )
Yes, the result is the low flow threshold is 0.1 Q2
Yes, the result is the low flow threshold is 0.3Q2
Yes, the result is the low flow threshold is 0.5Q2
If a geomorphic assessment has been performed, provide title, date, and preparer:
Discussion/ Additional Information: (optional)
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
13
STORM WATER QUALITY MANAGEMENT PLAN JUNE 2017
Other Site Requirements and Constraints
When applicable, list other site requirements or constraints that will influence storm water
management design, such as zoning requirements including setbacks and open space, or City
codes governing minimum street width, sidewalk construction, allowable pavement types, and
drainage requirements.
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.
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
14
STORM WATER QUAlJTY MANAGEMENT PLAN
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
JUNE 2017
15
( City of
Carlsbad
STANDARD PROJECT
REQUIREMENT
CHECKLIST
E-36
Project lnfonnation
Project Name: Kaiser Carlsbad Parking Lot Expansion
Project ID :CD2017-0003
DWG No. or Building Permit No.: DWG 504-2A
Source Control BMPs
Development Services
Land Development Engineering
1635 Faraday Avenue
(760) 602-2750
www.carlsbadca.gov
All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See
Chapter 4 and Appendix E.1 of the BMP Design Manual for information to implement source control BMPs shown in this
checklist.
Answer each category below pursuant to the following.
• "Yes" means the project will implement the source control BMP as described in Chapter 4 and/or Appendix E.1 of the
Model BMP Design Manual. Discussion/justification is not required.
• "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be
provided. Please add attachments if more space is needed.
• "N/A" means the BMP is not applicable at the project site because the project does not include the feature that is
addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion/justification may be
provided.
Source Control Requirement Applied?
SC-1 Prevention of Illicit Discharges into the MS4 IZ]Yes • No • N/A
Discussion/justification if SC-1 not implemented:
SC-2 Storm Drain Stenciling or Signage IZI Yes • No • N/A
Discussion/justification if SC-2 not implemented:
SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind IZl Yes • No • N/A Dispersal
Discussion/justification if SC-3 not implemented:
E-36 Page 1 of 4 Revised 03/16
Source Control Reauirement (continued} Applied?
SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and IZ]Yes • No • N/A Wind Dispersal
Discussion/justification if SC-4 not implemented:
SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal IZl Yes • No • N/A
Discussion/justification if SC-5 not implemented:
SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and
identify additional BMPs. (See Table in Appendix E.1 of BMP Manual for Quidance).
IZl On-site storm drain inlets IZl Yes • No • N/A
• Interior floor drains and elevator shaft sump pumps • Yes • No Ill N/A
• Interior parking garages • Yes • No Ill N/A
• Need for future indoor & structural pest control • Yes • No '21 N/A
IZl Landscape/Outdoor Pesticide Use IZI Yes • No • N/A
• Pools, spas, ponds, decorative fountains, and other water features • Yes • No Ill N/A
• Food service • Yes • No Ill N/A
• Refuse areas • Yes • No IZl N/A
• Industrial processes • Yes • No Ill N/A
• Outdoor storage of equipment or materials • Yes • No 1Z1 N/A
• Vehicle and Equipment Cleaning • Yes • No Ill N/A
• Vehicle/Equipment Repair and Maintenance • Yes • No 1Z1 N/A
• Fuel Dispensing Areas • Yes • No Ill N/A
• Loading Docks • Yes • No Ill N/A
• Fire Sprinkler Test Water • Yes • No IZI N/A
• Miscellaneous Drain or Wash Water • Yes • No Ill N/A
IZ] Plazas, sidewalks, and parkinQ lots IZl Yes • No 0 N/A
For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers.
Storm Drain Inlets:
*Mark all inlets with the words. "No Dumping! Flows to Ocean!"
See attached sheet for continuation of "Yes" answers
E-36 Page 2 of 4 Revised 03/16
Standard Project Requirement Checklist E-36
Continuation of SC-6:
Landscape/Outdoor Pesticide Use:
*For Landscape/Outdoor Pesticide use, final landscape plans will: 1) Preserve existing drought tolerant
trees, shrubs, and ground cover to the maximum extent possible, 2) Design landscaping to minimize
irrigation and runoff, to promote surface infiltration where appropriate, and to minimize the use of
fertilizers and pesticides that can contribute to storm water pollution, 3) Specify plants that are tolerant of
periodic saturated soil conditions where landscape areas are used to retain or detain storm water, 4) Use
pest resistant plans adjacent to hardscape, and 5) Select plants appropriate to site soils, slopes, climate,
sun, wind, rain , land use, air movement, ecological consistency, and plant interactions.
Plazas, sidewalks, and parking lots:
*Plazas, sidewalks, and parking lots shall be swept regularly to prevent the accumulation of litter and
debris.
*Debris from pressure washing shall be collected to prevent entry into the storm drain system.
Washwater containing any cleaning agent or degreaser shall be collected and discharged to the sanitary
sewer and not discharged to a storm drain.
Site Design BMPs
All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See
Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual for information to implement site design BMPs shown in
this checklist.
Answer each category below pursuant to the following.
• "Yes" means the project will implement the site design BMPs as described in Chapter 4 and/or Appendix E.2 thru E.6 of
the Model BMP Design Manual. Discussion/ justification is not required .
• "No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be
provided. Please add attachments if more space is needed.
• "N/A" means the BMPs is not applicable at the project site because the project does not include the feature that is
addressed by the BMPs (e.g., the project site has no existing natural areas to conserve). Discussion/justification may be
provided.
Source Control Requirement l Applied?
SD-1 Maintain Natural Drainaqe Pathways and Hydrologic Features l • Yes I • No I IZI N/A
Discussion/justification if SD-1 not implemented:
No existing natural drainage pathways exist onsite.
SD-2 Conserve Natural Areas, Soils, and Vegetation I IZ!Yes I • No I • N/A
Discussion/justification if SD-2 not implemented:
SD-3 Minimize Impervious Area I Ill Yes I • No I • N/A
Discussion/justification if SD-3 not implemented:
Only impervious areas required to gain additional parking were added to the site along with pedestrian walkway
connections.
SD-4 Minimize Soil Comoaction I IZIYes I • No I • NIA
Discussion/justification if SD-4 not implemented:
SD-5 Impervious Area Dispersion I IZI Yes I • No I • N/A
Discussion/justification if SD-5 not implemented:
E-36 Page 3 of 4 Revised 03/16
Source Control Requirement (continued) I Applied?
SD-6 Runoff Collection I 121 Yes \ D No I D N/A
Discussion/justification if SD-6 not implemented:
SD-7 Landscaping with Native or Drought Tolerant Species l 121 Yes I D No I D N/A
Discussion/justification if SD-7 not implemented:
SD-8 Harvesting and Using Precipitation l D Yes I Ill No ID N/A
Discussion/justification if SD-8 not implemented:
Harvesting precipitation and using precipitation is not planned for the project. Proper BMP implementation will treat storm
water runoff, as required. (See completed Form 1-7 in Attachment 1 c)
E-36 Page 4 of 4 Revised 03/16
STORM WATER QUALITY MANAGEMENT PLAN JUNE 2017
SUMMARY OF PDP STRUCTURAL BMPS
PDP Structural BMPs
All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of
the BMP Design Manual). Selection of PDP structural BMPs for storm water pollutant control
must be based on the selection process described in Chapter 5. PDPs subject to
hydromodification management requirements must also implement structural BMPs for flow
control for hydromodification management (see Chapter 6 of the BMP Design Manual). Both
storm water pollutant control and flow control for hydromodification management can be
achieved within the same structural BMP(s).
PDP structural BMPs must be verified by the City at the completion of construction. This may
include requiring the project owner or project owner's representative to certify construction of
th e 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).
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
17
STORM WATER QUALITY MANAGEMENT PLAN JUNE 201 7
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.
8/0FILTRATION (BF-I)
Using section 5.1 of the City of Carlsbad BMP Design Manual (Figure 5-1 and 5-2) Biofiltration was
selected as the treatment control BMP for the project and integrated as storm water flow control (HMP
sizing) and will include outlet control at the downstream outlet of the facilities. With infiltration
infeasible at the project location, the facilities will be lined in order for surface waters to discharge via
underdrain or overflow to the downstream conveyance system.
Per City of Carlsbad Fact Sheet BF-I, "Biofiltration (Bioretention with underdrain) facilities are
vegetated surface water systems that fi lter water through vegetation, and soil or engineered media prior to
discharge via underdrain or overflow to the downstream conveyance system. Bioretention with
underdrain facilities are commonly incorporated into the site within parking lot landscaping, along
roadsides, and in open spaces. Because these types of facilities have limited or no infiltration, they are
typically designed to provide enough hydraulic head to move flows through the underdrain connection to
the storm drain system. Treatment is achieved through filtration, sedimentation, sorption, biochemical
processes and plant uptake."
Biofiltration systems are effective at removing sediments and pollutants which are associated with fine
particles by filtration through surface vegetation and underlying engineered soil media. These systems
can also delay runoff peaks by providing detention and/or retention capacity in the media layer and
ponding area through the controlled release of treated runoff. The addition of vegetation not only
increases the aesthetic value of these areas, but also enhances the filtration component of the system
through plant uptake and helps maintain the porosity of the engineered soil layer. Biofiltration systems
can be constructed as either large or small scale devices with native or amended soils. Biofiltration
systems, like the systems designed for this project, collect storm water from impervious areas (roof areas
and other impervious surfaces) through the site's grading design.
The biofiltration systems for this project have been integrated into the drainage design to meet pollutant
control requirements for the site by minimizing directly connected impervious areas. The proposed
parking lots, building roof areas, and hardscape associated with the project drain to the proposed
biofiltration planter systems through the use of roof drain downspouts or piping, which allow runoff to
flow directly into the biofiltration areas for water quality treatment. Rip rap energy dissipaters will be
located at points where concentrated flow enters the biofiltration basins from roof drain downspouts or
pipe outfalls to minimize erosion from occurring.
Biofiltration systems are designed to allow ponding to occur. A soil layer, gravel layer, under drain
system, and im permeable liner was designed for the systems due to the poor infiltration rates of the in situ
soil and the systems' close proximity to the proposed improvements and building foundations.
(Continued on next paqe.)
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
18
STORM WATER QUALITY MANAGEMENT PLAN JUNE 201 7
Biofiltration systems function by allowing ponded runoff to infiltrate down through the mulch layer,
amended soi l layer, and the gravel layer; ultimately discharging to the private storm drain system through
the system's perforated under drain. The biofiltration system areas will be landscaped with a combination
of ground covers, shrubs and/or trees as selected by the project's landscape architect.
The biofi ltration systems wil l provide water quality treatment for the calculated DCV for each DMA. The
project is exempt from hydromodification management requirements. (See discussion of
Hydromodification Management Requirements on page 11 ).
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
19
STORM WATER QUA LITY MA NAGEMENT PLAN
Structural BMP Summary Information
Structural BMP ID No.: 1 (OMA 1)
DWG 504-2A Sheet No. 3, 5, & 7
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Partial retention by biofiltration with partial retention (PR-1)
~ Biofiltration (BF-1) (BMP ID No. 1)
Flow-thru treatment control included as pre-treatment/forebay for an
biofiltration BMP (provide BMP type/description and indicate
biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Other (describe in discussion section below)
Purpose:
~ Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Other (describe in discussion section below)
Discussion (as needed):
Biofiltration BMP for treatment of DCV with 36-hour drawdown.
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
20
which
JUNE 2017
onsite retention or
onsite retention or
STORM WATER QUALITY MANAGEMENT PLAN
Structural BMP Summary Information
Structural BMP ID No.: 2 (OMA 2)
DWG 504-2A Sheet No. 3, 6, & 7
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
D Partial retention by biofiltration with partial retention (PR-1)
~ Biofiltration (BF-1) (BMP ID No. 2)
JUNE 2017
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or
biofiltration BMP (provide BMP type/description and indicate which onsite retention or
biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Other (describe in discussion section below)
Purpose:
~ Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
1 Pre-treatment/forebay for another structural BMP
Other (describe in discussion section below)
Discussion (as needed):
Biofiltration BMP for treatment of DCV with 36-hour drawdown.
KAISER PERMA NENTE CARLSBAD
PARKING LOT EXPANSION
21
STORM WATER QUA LITY MANAGEMENT PLAN JUNE 2017
ATTACHMENT 1
BACKUP FOR PDP POLLUTANT CONTROL BMPS
Attachment Contents
Sequence
Attachment 1 a OMA Exhibit (Required)
See OMA Exhibit Checklist on the
back of this Attachment cover sheet.
(24"x36" Exhibit typically required)
Checklist
~ Included
Attachment 1 b Tabular Summary of OMAs Showing ~ Included as Attachment 1 b
OMA ID matching OMA Exhibit, OMA separate from OMA Exhibit
Attachment 1 c
Attachment 1 d
Area, and OMA Type (Required)*
*Provide table in this Attachment OR
on OMA Exhibit in Attachment 1 a
Form 1-7, Harvest and Use Feasibility
Screening Checklist (Required unless
the entire project will use infiltration
BMPs)
Refer to Appendix B.3-1 of the BMP
Design Manual to complete Form 1-7.
Form 1-8, Categorization of Infiltration
Feasibility Condition (Required unless
the project will use harvest and use
BMPs)
Refer to Appendices C and D of the
BMP Design Manual to complete
Form 1-8.
~ Included
Not included because the entire
project will use infiltration BMPs
~ Included
Not included because the entire
project will use harvest and use
BMPs
Attachment 1e Pollutant Control BMP Design ~ Included
Worksheets / Calculations (Required)
Refer to Appendices B and E of the
BMP Design Manual for structural
pollutant control BMP design
guidelines
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
22
Attachment la
OMA Exhibit
20·
I
LOT13 I
MAP10899 ,;:!.
0.:
I
I
0 ! ,
-
-
1~ 0 20· 40' ~1----1-~1
SCALE: 1" = 20'
s
\ I
BU/J..DINGA
I
I
I
E.XISTlNG
DRIVEWAY
_ (EXJS11NG 2-BTORY
I MEDICAL OFFICE)
E.XIST1NG PARKING
LOT TO RE.MAIN
.. 0
f ---~, ----,"'-o--=.._.., ,
0
@
(~
~XIST1NG PARKING
~ LOT TO RE.MAIN
E.XIST1NG RIBBON
GUTTER TO RE.MAI
n
' 0 ,
0 ---0 z
s
@
I I
w
--
u
EXIS11NO
B.EVATOR
AND
STAIRS
-~· . '
UNE.O BIOFIL TRA TlON BMP ~ 'j'
(360 SF) 64.0 FG ~11%
BUILDINGS
(EXJST1NG 2-STORY
MEDICAL OFFICE)
AVENIDA Ill I ENCINAS
s -i s
C/L I
1'1
PLAN VIEW -OMA AREAS
SCALE.: 1" = 20'
WIDTH VARIES PE:R PLAN
s
BIO-FILTRATION BASIN WITH IMPERMEABLE LINER DETAIL
NOT TO SCALE.
I I I
:::E ~=E
I I I
I I I
I I I :::E :::E::':::
I I
I I
I I I
/
LOT ff
MAP10899
I
7
/
I I
I I
I I
I I
I I
I I
I I
I I
I I I I I I \ I I rrb:====,
I I
I I / I \ I I
\/ ,' i I
E.XIST1NG PARKING~\
LOT TO RE.MAIN
I \ I \ I I
~::::::::::::::d--iE.XISTl NG CURB \ TO RE.MAIN
1---~ ,-E.XIST1NG SIDE.WALK
TO RE.MAIN
I I \
I I
I
I
I
I
I
I
\
\
\
I
PROPOSED
TRENCH DRAIN
\
\
E.XIST1NG STORM
DRAIN INLE.T
\
I
\
\
\
"\
\f ;G),.-
E.XISTlNG 1
I ~
I
I
~--~~"--".RJW ~I Ii)" --
BF
LINE.D BIOFIL TRA TlON BMP
( 45 SF) 63.9 FG
Know what's below.
Ca ll before you dig.
LEGEND
PROPOSED STORM DRAIN
PROPOSED HARDSCAPE/ IMPERVIOUS
AREA
PROPOSED LANDSCAPING/ PERVIOUS AREA
DRAINAGE MANAGEMENT
AAEA(DMA)BOUNDARY
TREATMENT CONlROL BMP NUMBER
FLOW DIRECTION AFflOW
TREATMENT CONTROL BMPS
BIORLTRATION WITH
IMPERMEABLE LINER
SELF-MmGATING DMA
DE MINIMIS DMA
0 ...
SOURCE CONTROL BMPS
INLET STENCILING 0
SOIL INFORMATION
SOIL: TYPEB
SITE INFORMATION:
IMPERVIOUS AREA:
PERVIOUS AREA:
TOTAL DISTURBED AREA:
85TH PERCENTILE STORM DEPTH:
0.31 AC
0.17 AC
0.48 AC
0.57 in
OMA SUMMARY
DRAINAGE IMPERVIOUS MANAGEMENT BMP TYPE AREA (AC) AREA (OMA)
1 8/0FIL TRA TION 0.28
2 8/0FIL TRA TION 0.03
3* SELF-MIT/GA TING 0.00
4 SELF-MIT/GA TING 0.00
5 DE MIN/MIS 0.00
6 SELF-MIT/GA TING 0.00
PERVIOUS
AREA (AC)
0.05
0.02
0.09
0.01
0.00
0.00
TOTAL
ARE.A
(ACRES)
0.33
0.05
0.09
0.01
0.00
0.00
*LANDSCAPING TO BE. RE.PLACED WITH NON-INVASIVE. DROUGHT TOLE.RANT SPE.CIE.S PER
SECTION 5.2.1 OF THE CI TY OF CARLSBAD BMP OE.SIGN MANUAL.
BIOFIL TRA TION BMP SUMMARY
BMP ID BMP TYPE REQUIRED BMP PROVIDED BMP
AREA (SF) AREA (SF)
1 BIOFIL TRA TION 337 360
2 BIOFIL TRA TION 36 45
PASCO LARET SUITER
& ASSOCIATES
KAISER PERMANENTE -CARLSBAD
PARKING LOT EXPANSION
SWQMP OMA EXHIB IT
CIVIL ENGINEERING + LAND PLANNING + LAND SURVEYING
535 North Highway I 01, Sui te A Solana Beach, CA 92075
ph 85 8.259.8212 I fx 858.259.4812 I plsaengineering.com
CARLSBAD. CALIFORNIA
PROJECT NUMBER: PE 2512
SCALE: 1" = 20·
DATE: JUNE 2017
SHEET 1 OF 1
Attachment 1 b
L---~~---~-DMASummary
-__ -~ _~_-_-_-_-_-_-_-_-_-_--~ -~ _-_-_-_-_-_-_-_-_-_-_-__.-
I
I
I
I
I
PASCO LARET SUITER
~ & A SS OCI AT ES
CIVIL ENGINEERING+ LAND PLANNING. LAND SURVEYING
DMA DCV Summary
Kaiser Carlsbad Parking Lot Expansion
May 2017
Where:
C = Runoff factor (unitless)
d = 85th percentile, 24-hr storm event rainfall depth (inches), refer to section B.1.3.
A = Tributary area draining to the BMP
BASIN AREAS (SF)
Impervious Pervious D.G. Total
1 12,128 2,289 0 14,417
2 1,313 740 0 2,053
*DCV = 3630 x C(ocv) x d (inches) x A (acres)
AREAS (acre)
Impervious Pervious D.G.
0.28 0.05 0.00
0.03 0.02 0.00
DCV Surface Runoff Factors* Proposed Biofiltration BMP Section
Impervious Area 0.9 Section Thickness (in) Porosity Volume/sf
Pervious Area/Landscape 0.10 Ponding 10 1.0 0.83
Decomposed Granite 0.30 Engineered Soil 18 0.1 0.15
*See Table B.1-1 Gravel 12 0.4 0.40
Total Volume/SF 1.38
d
Total (In)
0.33 0.57
0.05 0.57
DCV Area Sizing
C Design Capture
(DCV) Volume (DCV)*
(no unit) (cf)
0.78 533
0.58 60
Project: Kaiser Carlsbad
Job No.: PE 2512-01
Cale. By: RT Date: May 2017
Checked: RT Date: May 2017
Sheet: 1_ of 1
Attachment 1 c
___ Harvest and Use Feasibility (Form 1-7)
PASCO LARET SUITER
& ASSOCIATES
CIVIL ENGINEERING -LAND PLA!\INING + LAND SURVEYING
Kaiser Permanente Carlsbad Parking Lot Expansion
Harvested Water Demand
Toilet and Urinal Flushing
Land Use Type: Commercial/Parking
Per Capita Use Total Usage Demand
# of Employees per Day* per Day 36-hour Demand
N/A ------
*Gallons per employee per day for office land use type (See Table B.3-1)
Landscape Irrigation
Landscape Area 36-hour TOTAL Irrigation
(Acres) Demand** Demand (Gallons/36
hour)
0.17 1470 249.9
Project: Kaiser Carlsbaed
Job No.: PE 2512
Cale. By: RT Date: May 2017
Checked:RT Date: May 2017
Sheet: 1 of 1
**Gallons per irrigated acre per 36-hour period (See Table B.3-3, Hydrozone -Moderate Plant Water Use)
1. ls there a demand for harvested water (check all that apply) at the project site that is reliably
present during the wet season?
Demand for harvested water is present at the project site and currently in use for site
irrigation by way of existing retention basins (water hazards) on the golf course.
D Toilet and urinal flushing
~ Landscape irrigation
D Ocher: ________ _
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.
33.4 cubic feet (250 gallons)
2. Calculate the D C\' using worksheet B.2.1
593 cubic feet (4,436 gallons)
3a. ls the 36-hour demand greater
than or equal to the D C\'?
No
Harvest and use appears to be
feasible. Conduct more detailed
evaluation and sizing calculations
to confirm that DCV can be used
at an adequate rate to meet
drawdown criteria.
36. ls the 36-hour demand greater than
0.25DC\' but less than the full D C\'?
No
Harvest and use ma\' be feasible.
Conduct more detailed c,·aluation and
sizing calculations to determine
feasibility. HarYest 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.
3c. Is the 36-hour demand
less than 0.25DCV?
Yes
New harvest and
use is considered
to be infeasible.
Attachment 1 d
--------Infiltration Feasibility
Part 1-Full Infiltration Feasibility Screening Criteria
Would infiltration of the full design volume be feasible from a physical perspective without any
undesirable consequences that cannot be reasonably mitigated?
Criteria Screening Question
ls the estimatcc.l 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 prescntcc.l in , \ppendix C.2 and Appendix D.
Provide basis:
Yes No
X
t-.leasurec.l infiltration rates ranged from 0.0 in/hr to 0.84 in/hr. \X'ith application of the minimum factor of safety th
lcsign infiltration rares would be 0.0 in /hr to 0.32in/hr. This form is included with site infiltration report prepared b)
IU\'l \ Croup. (Ref. Preliminary Soil Infiltration Testing and Pavement Structural Section Report, Kaiser Carlsbad
Parking Lot Expansion, dated May 10, 2017 by RM A Group, RMA Project No. 17-0497-0 I).
Summarize findings of studies; provide reference to studies, c.:tlculations, maps, data sources, etc. Provide n.:trrativc
discussion of study/ data source applicability.
2
Can infiltration greater than 0.5 inches per hour be allowed without increasing tisk of
gcorechnical hazarc.ls (slope srnbilit1·, ground\\·ater mounding, utilities, or other factors)
that cannot be mitigated to an acceptable level? T he response ro this Screening
Question shall be based on a comprehensive evaluation of the factors presented in
, \ppendix C.2.
Provide basis:
X
or applicable. Measured infiltration rates ranged from 0.0 in/hr to 0.84 in/hr. \X'ith application of the minimum factor
f s.:tfcty the design infi.l.cration rates would be 0.0 in/hr to 0.32in/hr.
Infiltration at the site will nor impact slope srnbiliry since there arc no nearby slopes at the site, the soils onsite ar
medium dense to dense silty sand and sand with silt .:tnd are not subject to hydrocollapse or consolidation based upon
SPT blow counts, arc non-expansive and nor subject to liquefaction. Ground\1·arcr mounding would nor be cxpccte
baseJ on the separation betwe<.:n the bottom of the proposed basins being greater than 10 feet anJ the slow infiltratio
rates obtained in our testing.
Summ.:trize findings of stullics; provide reference ro studies, calcul.:ttions, maps, data sources, etc. Provide n.:trrative
discussion of study/ data source applicabiliry.
Criteria
3
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 ocher
factors) that cannot be mitigated to an acceptable level? The response to this Screening
Question shall be based on a comprehensive crnluation of the factors presented in
,\ppcndix C.3.
Provide basis:
Yes No
X
Nor applicable. /vkasurcd infiltration rates ranged from 0.0 in/hr to 0.84 in/hr. \X'ith ap plication of the minimum facto
lf safety the design infiltration rares would be 0.0 in/hr to 0.32in/hr.
Ground water beneath the sire was not encountered in or exploratory borings that extended to a depth of 16.5 fee
below the existing ground surface.
,\ccording to the Geocracker website (http://geotracker.waterboarcls.ca.gov), groundwater was encountered 111 ,
monitoring well located approximately 1 mile northwest of the site was at a depth of 28 feet in 2005.
Due to the slow infiJcration rate and the separation berwcen the groundwater level and rhe proposed basin botto1
·lcvation and the proposed use as vehicle parking, an increased risk of ground\rnter contamination is considered veq
low.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, ere. Provide narrative
d iscussion of study/ data source applicability.
4
Can infiltration grearer than 0.5 inches per hour be allowed \,·ithour causing potential
water balance issues such as change of seasonal.icy of ephemeral screams or increased
discharge of contaminated groundwater to surface waters? The response ro this
Screening Question shall be based on a comprehensive evaluation of the factors
presented in ,\ppcndix C.3.
Provide basis:
X
1 or applicable. J\lcasured infiltration rates ranged from 0.0 in/hr to 0.84 in/hr. \X'ith application of the minimum facto
f safety the design infiltration rares \H)Uld be 0.0 in/hr to 0.32in/hr.
Due to the slow infiltration rare and the separation between the groundwater level and the proposed basin botmn
·lcvation and the proposed use as vehicle parking, and increase potential water balance issues such as change o
seasonality of ephemeral streams or increased discharge of contaminated groundwater to surface waters is considered
,cry lo\,·. No ephemeral streams arc located onsite or nearby and the Geotracker websire docs not indicate a source o
known contamination wirhin a mile of the sire.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Pro\·ide narrative
discussion of study/ data sourc<.: applicability.
Part 1
Result*
l f all answers to rows 1 -4 are ''Yes" a full infiltration design is porenrialh· feasible.
The feasibility screening category is Full Infiltration
lf any answer from row l-4 is "No", infiltration may be possible to some extent but would
nor generally be feasible or desirable to achieve a "full infiltration" design. Proceed to Part 2
See Part
i
*To be completed using gathered site information and best professional judgment considering the definition of I\IE.P in
the MS4 Permit. , \dditional testing and/ or studies may be required by City l~ngineer to substantiate findings.
Part 2 -Partial Infiltration vs. No Infiltration Feasibility Screening Criteria
Would infiltration of water in any appreciable amount be physically feasible without any negative
consequences that cannot be reasonably mitigated?
Criteria
5
Screening Question
Do soil and geologic conditions allo\\' for infiltration in any appreciable rate or volume?
The response co chis Screening Question shall be based on a comprehensive evaluation
of the factors presented in ,\ppcndix C.2 and . \ppendix D.
Provide basis:
Yes No
X
I\Icasured infiltration rares ranged from 0.0 in/hr co 0.84 in/hr. \X'ith application of the minimum factor o f safety the
esign infiltration rates would be 0.0 in/hr to 0.32in/hr. This form is included with sire infiltration report prepared by
RI\!.\ Group. (Ref. Preliminary Soil Infiltration Testing and Pavement Structural Section Report, Kaiser Carlsbad
Parking Lot Expansion, dated May I 0, 20 I 7 by R.MA Group, RMA Project No. 17-0497-0 I).
Summarize findings o f studies; provide reference ro srudies, calculations, maps, dara sources, ere. Provide narrative
discussion of study/ data source applicability and why it was not feasible to miti!,tate lo'"' infiltration rares.
6
Can lnfilrration in any appreciable lJuantity be allowed without increasing risk of
gcotechnical hazards (slope stability, groundwater mounding, utilities, or other factors)
char cannot be mitigated co an acceptable level;; T he response to rhis Screening
Question shall be based on a comprehensive evaluation of rhe factors presented in
.\ppcndix C.2.
Provide basis:
X
Infiltration ar the site ,,·ill nor impacr slope srabiliry since rherc arc no nearby slopes ar rhe sire, the soils onsirc ar
medium dense to dense silty sand and sand ,,·id, silr and arc nor subject to hy<lrocollapse or consolidation based upon
SPT blcl\\· counts, arc non-expansive and not subject ro lil1ucfaction. Groundwater mounding would nor be expected
based on the separation between the bottom of the proposed basins being greater than 10 feer and the slow infiltratio1
rares obtained in our testing. \X'oulcl increase risk ro c:xisring underground utilities (particularly to electrical and
telephone urilirics) servicing the existing Medical Office Building.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, ere. Provide narrarive
iscussion of stud1-/ data source applicabiliry and ,d1y it was nor feasible to mitigate low infiltrarion rares.
Criteria Screening Question
7
Can lnftltration in any appreciable c1uantity be allowed \,·ithout posing sii,>nificanr 1isk
for groundwarer related concerns (shallm,· water table, storm water pollutants or other
facrorsf T he response to this Screening Question shall be based on a comprehensive
evaluation of the factors presented in ;\ppcndix C.3.
Provide basis:
Yes No
X
l nftltration at the site will not impact slope stability since there arc no nearby slopes at the site, the soils o n site arc dense
silty sand and sand with silt and are nor subject to hydrocoUapsc or consolidation based upon SPT blow counts, arc
non-expansive and not subject to liquefaction. Groundwater mounding would not be expected based on the separatio1
ctwecn the bottom of the proposed basins being greater than 10 fccr and the slow infiltration rates o btained in ou
resting.
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 infilu·ation rares.
8
Can infiltration be allowed wirhour violating downstream water tights? The response ro
this Screening Question shall be based on a comprehensive evaluation of the factors
presented in , \ppcndix C.3.
Provide basis:
X
he site is not up gradient from a stream course and is located about ½ mile from the ocean. , \lso, no known water
veils arc located within a ½ from the sire. r:valuation of downstream water rights is outside of the purview o
•corechnical engineering.
Summarize findings of studies; provide reference to studies, calculations, maps, Jara sources, ere. Prm·idc narrative
J iscussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rares.
Parr 2
Resulr*
lf all ans\l'crs from row 1-4 are res 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 ro be
infeasible \\'ithin the drainage area. The feasibilirr screening category is No lnftltration.
No
Infiltration
*To be completed using gathered site info rmation and bcsr professional judgment considering the definition of MEP in
the I\IS4 Permit. . \dditional resting and/ or studies may be required by City Engineer to substantiate findings.
Attachment 1 e
.____~~ ___ BMP Design Worksheets
Kaiser Carlsbad Parking Lot Expansion
PE 2512-01
5/6/2017 DMAl
Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs
1 Remaining DCV After implementing retention BMPs 533.0
Partial Retention
2 Infiltration rate from Worksheet D.5-1 if partial infiltration is feasible 0.00
3 Allowable drawdown time for aggregate storage below the underdrain 36
4 Depth of runoff that can be infiltrated [Li ne 2 x Line 3] 0.00
5 Aggregate pore space 0.40
6 Required depth of gravel below the underdrain [Line 4 / Li ne 5] 0.00
7 Assumed surface area of the biofiltration BMP 360.0
8 Media retained pore storage 0.1
9 Volume retained pore storage 54.00
10 DCV that requires biofiltration [Line 1 -Line 9] 479.0
BMP Parameters
11 Surface Poding (6 inch minimum, 12 inch maximum] 10
12 Media Thickness [18 in Min], also add mulch layer thicknes to this line 18
13
Aggregate Storage above underdrain inver (12 inches typical) -Use O inches for 12 sizing if the aggregate is not over the entire bottom surface area
14 Freely drained pore storage 0.4
Media filtration rate to be used for sizing (5 in/hr. with no outlet cont rol; if the
15 filtration rate is controlled by the out let, use t he outlet controlled rate which will 5
be less than 5 in/hr.)
Baseline Calculations
16 Allowable Routing Time for sizing 6
17 Depth filtered during storm [Line 15 x Line 16) 30
Depth of Detention Storage 22.00 18 [Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5))
19 Tot al Depth Treated [Line 17 + Line 18) 52.00
Option 1 -Biofilter 1.5 times the DCV
20 Required biofiltered volume (1.5 x Line 10] 719
21 Required Footprint [Line 20 / Line 19) x 12 165.8
Option 2 -Store 0.75 of remaining DCV in pores and poding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10] 359
23 Required Footprint [Line 22 / Line 18] x 12 196
Footprint of the BMP
24 Area draini ng to t he BMP 14417.0
Adjusted Runoff Factor for drainage area (Refer 0.78
25 to Appendix B.1 and B.2)
26 BMP Footprint Sizing Factor (Default 0.03 or an alternative minimum footprint 0.03 sizing factor from Worksheet B.5-2, Line 11)
27 Minimum BMP Footprint [Line 24 x Line 25 x Line 26] 337
28 Footprint of the BMP = Maximum (Minimum(Line 21, Line 23), Line 27) 337
Check for Volume Reduction [Not applicable for No Infiltration Condition]
~ Gale1:Jlate tRe fFaetieA ef 9GV FetaiAeel iA tRe BMP (l:iAe 9 /-l:iAe :1:J G-:-±m
~ MiAiFAl:JFA FeE11:JiFeel fFaetieA ef 9GV FetaiAeel feF 13aFtial iAfiltFatieA eeAelitieAs ~
Is tRe RetaiAeel 9p.1 ~ Q.37§:;l If tRe aAsweF is Re iAeFease tRe feet13FiAt sii!iAg NI-A
3-1 faeteF iA bi Re ia 1:JAtil tRe aAsweF is iyes feF tRis EFiteFieA.
cu-ft
in/hr
hours
inches
in/in
inches
sq-ft
in/in
cu-ft
cu-ft
inches
inches
inches
in/in
in/hr
hours
inches
inches
inches
cu-ft
sq-ft
cu-ft
sq-ft
sq-ft
sq-ft
sq-ft
1:JAitless
1:JAitless
NI-A
J:\Active Jobs\2512 KAISER CARLSBAD\CIVIL\REPORTS\SWQMP-Final\Appendices\Appendix le-BMP Design
Worksheets\2512_Worksheet B.5-l_Biofiltration BMP Sizing
Kaiser Carlsbad Parking Lot Expansion
PE 2512-01
5/6/2017
DMA2
Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs
1 Remaining DCV After implementing retention 8MPs 60.0
Partial Retention
2 Infiltration rate from Worksheet D.5-1 if partial infiltration is feasible 0.00
3 Allowable drawdown time for aggregate storage below the underdrain 36
4 Depth of runoff that can be infiltrated [Line 2 x Line 3] 0.00
5 Aggregate pore space 0.40
6 Required depth of gravel below the underdrain [Line 4 / Line SJ 0.00
7 Assumed surface area of the biofiltration 8MP 46.0
8 Media retained pore storage 0.1
9 Volume retained pore storage 6.90
10 DCV that requires biofiltration [Line 1 -Line 9] 53.1
BMP Parameters
11 Su rface Poding (6 inch minimum, 12 inch maximum] 10
12 Media Thickness [18 in Min], also add mulch layer thicknes to this line 18
13
Aggregate Storage above underdrain inver (12 inches typical) -Use O inches for 12 sizing if the aggregate is not over the entire bottom surface area
14 Freely drained pore storage 0.4
Media filtration rate to be used for sizing (5 in/hr. with no outlet control; if the
15 filtration rate is controlled by the outlet, use the outlet controlled rate which will 5
be less than 5 in/hr.)
Baseline Calculations
16 Allowable Routing Time for sizing 6
17 Depth filtered during storm [Line 15 x Line 16] 30
Depth of Detention Storage 22.00 18 [Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)]
19 Tot al Depth Treated [Li ne 17 + Line 18] 52.00
Option 1 -Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10] 80
21 Required Footprint (Line 20 / Line 19] x 12 18.4
Option 2 -Store 0.75 of remaining DCV in pores and poding
22 Required Storage (surface+ pores) Volume [0.75 x Line 10] 40
23 Required Footprint (Line 22 / Line 18] x 12 22
Footprint of the BMP
24 Area draining to the 8MP 2053.0
Adjusted Runoff Factor for drainage area (Refer 0.58
25 to Appendix 8.1 and 8.2)
26 8MP Footprint Sizing Factor (Default 0.03 or an alternative minimum footprint
sizing factor from Worksheet 8.5-2, Line 11)
0.03
27 Minimum 8MP Footprint (Line 24 x Line 25 x Line 26] 36
28 Footprint of the 8MP = Maximum (Minimum(Line 21, Line 23), Line 27) 36
Check for Volume Reduction [Not applicable for No Infiltration Condition]
~ Gale1:1late Hie fFaetieA ef 9GV FetaiAeel iA tl:ie BMP f bi Re 9 /. bi Re :i:J ~
~ ~ MiAiFAl:lFA FeEjl:liFea fFaEtieA ef 9GIJ FetaiAea foF 13aFtial iAfiltFatieA E9Aaiti9AS
Is tl:ie RetaiAea 9GV::. G.3:;zs:;i If tl:ie aAsweF is Re iAEFease tl:ie foet13FiAt siliAg f>+/-A ~ faeteF iA bi Re ~e l:lAtil tl:ie aASWeF is yes f9F t l:iis EFiteFieA.
cu-ft
in/hr
hours
inches
in/in
inches
sq-ft
in/in
cu-ft
cu-ft
inches
inches
inches
in/in
in/hr
hours
inches
inches
inches
cu-ft
sq-ft
cu-ft
sq-ft
sq-ft
sq-ft
sq-ft
1:1Aitless
1:1Aitless
f>+/-A
J:\Active Jobs\2512 KAISER CARLS8AD\CIVIL\REPORTS\SWQMP-Final\Appendices\Appendix le-8MP Design
Worksheets\2512_Worksheet B.5-1_8iofiltration BMP Sizing
STORM WATER QUALITY MANAGEMENT PLAN JUNE201 7
ATTACHMENT 2
BACKUP FOR PDP HYDROMODIFICATION CONTROL MEASURES
Attachment Contents
Sequence
Attachment 2a Hydromodification Management
Exhibit (Required)
Attachment 2b Management of Critical Coarse
Sediment Yield Areas (WMAA Exhibit
is required, additional analyses are
optional)
See Section 6.2 of the BMP Design
Manual.
Attachment 2c Geomorphic Assessment of Receiving
Channels (Optional)
See Section 6.3.4 of the BMP Design
Manual.
Attachment 2d Flow Control Facility Design and
Structural BMP Drawdown
Calculations (Required)
See Chapter 6 and Appendix G of the
BMP Desiqn Manual
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
23
Checklist
00 Included (Project is exempt from
Hydromodification Control
Requirements)
00 Exhibit showing project
drainage boundaries marked on
WMAA Critical Coarse
Sediment Yield Area Map
(Required)
Optional analyses for Critical Coarse
Sediment Yield Area Determination
6.2.1 Verification of Geomorphic
Landscape Units Onsite
6.2.2 Downstream Systems
Sensitivity to Coarse Sediment
6.2.3 Optional Additional Analysis
of Potential Critical Coarse
Sediment Yield Areas Onsite
00 Not performed
Included
00 Included
Attachment 2a
~ __ Hydromodification Exemption Exhibit
•• 'I,_ ' "
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I•.; -_. \L\'
\ .
\
~-
HMP
t,
LEGEND: --•••••
V//21
w J
EXEMPTION
MAJOR DRAINAGE BASIN BOUNDARY
NATURAL FLOW PATH
HYDROMODIFICATION EXEMPT AREA
HYDROMODIFICATION EXEMPT AREA IF FUTURE
DRAINAGE IMPROVEMENTS ARE CONSTRUCTED
EXH I B T *Exhibit take from the, "Hydromodification
Exemption Analyses for Select Carlsbad
Watersheds" by Chang Consultants dated
September 17, 2015
&.-1,f •
Attachment 2b
Potential Critical Course Sediment
Yield Areas Exhibit
arking Lot Expansion
_otential Critical Coarse Sediment Yield GIS Overlay
h,EGEND : fl',, Wl_~ •• --I -=Potential Critical Coarse
Sediment Yield Area* • --~~-~ -===--ea+--.•~~11 ource: Project Clean Water Watershed
anagement Area Analysis 2015
~ egional Potential Critical Coarse
Sediment Yield Area Mapping
1f'WW.projectcleanwater.org) ----------_.......,,t-:t:::a ..
Attachment 2c
Flow Control and
BMP Drawdown Calculations
PASCO LARET SUITER
& ASSOCIATES
CIVIL ENGINEERING+ LAND PLANNING + LAND SURVEYING
Flow Control Facility Design and Structural BMP Drawdown Calculations
The following BMP Sizing and Orifice outflow calculations are intended to show only that the
orifice outfl ow meets the requirements of the BMP Design Manual. The BMP design
worksheets provided in Attachment I match the surface volume for biofiltration BMP areas (IO"
ponding) for the respective DMAs, however these calculations are not intended to show the or
subsurface (HMP) storage volume for biofiltration (shown as flow-through planter) areas in the
spreadsheets. Note, the project is HMP Exempt.
535 N Coast Highway 101 Ste A Solana Beach, Califo rnia 92075 I ph 858.259.8212 I fx 858.259.48 121
plsaengineering.com
BMP Sizing Spreadsheet Vl.04
Project Name: Kaiser Parking Lot Expansion
Project Applicant: Kaiser Foundation Health Plan, Inc.
Jurisdiction: City of Carlsbad
Parcel (APN): 214-450-19-00
Hydrologic Unit: 904.51
Rain Gauge: Lindbergh
Total Project Area (sf): 20,962
Channel Susceptibility: Low
The BMP Sizing Spreadsheet user should attempt to account for all elements of a project
site through the definition of Drainage Management Areas (DMAs) and BMPs. The total
area of the DMAs and BMPs should be equal to the total site area. Including all areas -
even those portions of the project site that will not be developed -will help the plan
reviewer assess the completeness of the BMP sizing effort in the project application.
This BMP Sizing Spreadsheet has been developed in accordance with the
San Diego BMP Sizing Calculator Methodology
Directions to User:
1. Fill out project information on this sheet . Rain gauge information can be found at
http://bit.ly/1 n H sW J e
2. Map and measure DMA's. Include a copy of the map with your submittal.
3. The entire site shall be divided into separate drainage management areas (DMAs), with
each area identified as one of the following: self-treating, self-retaining, draining to a self-
retaining area, or draining to a BMP. Each area should be clearly marked with a unique
identifier.
4. For each BMP within your project, copy the BMP and Orifice tabs simultaneously. Both
tabs must be copied together for linked formulas to work properly.
5. On the BMP tab, select BMP type and list all DMA's draining to the BMP.
6. Enter the information for each OMA.
7. Open the orifice tab and enter the exiting condition information for each OMA.
8. Enter a proposed orifice size.
9. Return to BMP tab and confirm selected BMP depth.
10. Return to orifice tab and confirm adequacy of drawdown time.
11. Make sure the BMP on your plans, specifications, and details match the proposed BMP
dimensions.
Frequently Asked Questions
1. When sizing the orifice, it does not seem to account for existing impervious area.
On the orifice tab, existing impervious areas are accounted for by selecting "Impervious"
for the soil type and "N/A" for the cover.
2. What does it mean when the drawdown time is blank?
This means that additional user information is need. The most common cause is a lacks
of input for the proposed vault or cistern volume on the BMP tab.
BMP Sizing Spreadsheet Vl .04
Project Name: Kaiser Parking lot Expansion Hydrologic Unit: 904.51
Project Applicant: Kaiser Foundation Health Plan, Inc Rain Gauge: Lindbergh
Jurisdiction: City of Carlsbad Total Project Area: 20962
Parcel (APN): 214-450-19-00 Low Flow Threshold: 0.5Q2
BMP Name: 1 (DMA 1) BMP Type: Flow-Through Planter
BMP Native Soil Type: N/A -Impervious Liner BMP Infiltration Rate (in/hr): N/A
Areas Draining to BMP HMP Sizing Factors
DMA Post Project Runoff Factor
Name Area (sf) Soil Type Slope Surface Type (Table 4-2) Surface Area Surface Volume Subsurface Volume Surface Area (sf)
1-Landscape 2289 B Flat Landscape 0.1 N/A N/A N/A N/A
1 • Impervious 12128 B Flat Impervious 0.9 N/A N/A N/A N/A
Total BMP Area 14417 Minimum BMP Size
Proposed BMP Size' 360
Soil Matrix Depth
Minimum Ponding Depth
Maximum Ponding Depth
Selected Ponding Depth
Describe the BM P's in sufficient detail in your SWMP to demonstrate the area, volume, and other criteria can be met within the constraints of the site.
BM P's must be adapted and applied to the conditions specific to the development project such as unstable slopes or the lack of available head.
Designated Staff have final review and approval authority over the project design.
This Sizing Calculator has been developed in compliance with the Countywide Model SUSMP. for questions or concerns please contact the jurisdiction in which your project is located.
Minimum BMP Size
Surface Volume Subsurface Volume
(cf) (cf)
N/A N/A
N/A N/A
300 216
18.00 in
in
5928.43 in
10.00 in
BMP Sizing Spreadsheet Vl.04
Project Name: iser Parking Lot Expansi Hydrologic Unit: 904.51
Project Applicant: Foundation Health Pia Rain Gauge: Lindbergh
Jurisdiction: City of Carlsbad Total Project Area: 20962
Parcel (APN): 214-450-19-00 Low Flow Threshold: 0.5Q2
BMP Name 1 (OMA 1) BMP Type: Flow-Through Planter
OMA Rain Gauge Existing Condition Q2 Sizing Factor OMA Area (ac)
Name Soil Type Cover Slope (cfs/ac)
1-Landscape Lindbergh B Scrub Flat 0.011 0.053
1 -Impervious Lindbergh B Scrub Flat 0.011 0.278
Orifice Flow -%Q2
(cfs)
0.000
0.002
0.002
Tot. Allowable
Orifice Flow
(ds)
0.515
Actual Orifice Flow
(cfs)
Orifice Area (in2)
0.01
0.04
0.04 0.24
Tot. Allowable Max Orifice
Orifice Area Diameter
(in2) (in)
12.57 4.00
Actual Orifice Area Selected
Orifice Diameter
(in2) (in)
Drawdown (Hrs) 0.2
BMP Drawdown time < 36 hours
with no orifice control, therefore, OK.
BMP Sizing Spreadsheet Vl.04
Project Name: Kaiser Parking Lot Expansion Hydrologic Unit : 904.51
Project Applicant: aiser Foundation Health Plan, Inc Rain Gauge: Lindbergh
Jurisdiction: City of Carlsbad Total Project Area: 20962
Parcel (APN ): 214·450-19-00 Low Flow Threshold: 0.SQ2
BMP Name: 2 (DMA2) BMPType: Flow-Through Planter
BMP Native Soil Type: NIA-Impervious Liner BMP Infiltration Rate (in/hr); N/A
Areas Draining to BMP HMP Sizing Factors
OMA Post Project Runoff Factor
Name Area (sf) Soil Type Slope Surface Type (Table 4·2) Surface Area Surface Volume Subsurface Volume Surface Area (sf)
2 • Landscape 740 B Flat Landscape 0.1 N/A N/A N/A N/A
2 • Impervious 1313 B Flat Impervious 0.9 N/A N/A N/A N/A
Total BMP Area 2053 Minimum BMP Size
Proposed BMP Size• 3319
Soil Matrix Depth
M inimum Ponding Depth
Maximum Ponding Depth
Selected Ponding Depth
Describe the BM P's in sufficient detail in your SWMP to demonstrate the area, volume, and other criteria can be met within the constraints of the site.
BM P's must be adapted and applied to the conditions specific to the development project such as unstable slopes or the lack of available head.
Designated Staff have final review and approval authority over the project design.
This Sizing Calculator has been developed in compliance with the Countywide Model SUSMP. For questions or concerns please contact the jurisdiction in which your project is located.
Minimum BMP Size
Surface Volume Subsurface Volume
(cf) (cf)
N/A N/A
N/A N/A
2766 1991
18.00 in
in
643.04 in
10.00 in
BMP Sizing Spreadsheet Vl.04
Project Name: iser Parking Lot Expansi Hydrologic Unit: 904.51
Project Applicant: Ir Foundation Health Pia Rain Gauge: Lindbergh
Jurisdiction: City of Carlsbad Total Project Area: 20962
Parcel {APN): 214-450-19-00 Low Flow Threshold: 0.5Q2
BMP Name 2 (DMA2) BMP Type: Flow-Through Planter
OMA Rain Gauge Existing Condition Q2 Sizing Factor OMA Area (ac)
Name Soil Type Cover Slope (cfs/ac)
2 -Landscape Lindbergh D Scrub Flat 0.05 0.017
2 -Impervious Lindbergh D Scrub Flat 0.05 0.030
Orifice Flow -%Q2
(cfs)
0.000
0.001
0.001
Tot. Allowable
Orifice Flow
(cfs)
0.515
Actual Orifice Flow
(cfs)
Orifice Area (in2)
0.01
0.02
0.03 0.19
Tot. Allowable Max Orifice
Orifice Area Diameter
(in2) (in)
12.57 4.00
Actual Orifice Area Selected
Orifice Diameter
(in2) (in)
Drawdown {Hrs) 1.5
BMP Drawdown time< 36 hours
with no orifice control, therefore, OK.
I
Attachment 3a
BMP Maintenance Thresholds
and BMP Fact Sheets
STORM WATER QUA LITY MANAGEMENT PLAN JUNE 2017
ATTACHMENT 3
Structural BMP Maintenance Information
OWNERSHIP AND MAINTENANCE FOR STRUCTURAL BMPs
The operations and maintenance of the treatment control BMPs will be the responsibility of the
owner. The current contact information for the responsible party is:
Kaiser Permanente
6860 Avenida Encinas
Carlsbad, CA 92011
(619) 528-5000
A training program will be adm inistered and implemented by Kaiser Permanente and shall occur
at a minimum of once annually. The training program shall consist of, at a minimum: the
disbursement of the brochures and flyers included in this SWQMP and a copy of the
maintenance plan to all operation and maintenance staff associated with the project. A training
log shall be filled out at each training session and kept for a minimum of five (5) years.
Kaiser Permanente will complete and maintain operation and maintenance forms to adequately
document all maintenance performed on the project's treatment control BMPs. These records
should be kept on file for a minimum of five (5) years and shall be made accessible to the City of
Carlsbad, the State Water Resources Control Board or any other authority regulating storm
water discharges for inspection upon request at any time.
All waste generated from the Kaiser Permanente Parking Lot Expansion project site is ultimately
the responsibility of Kaiser Permanente Disposal of sed iment, debris, and trash will comply with
applicable local, county, state, and federal waste control programs. Suspected hazardous
waste will be analyzed to determine proper disposal methods.
The following Operation and Maintenance Plan has been developed for each type of pollutant
control BMP used on this project. These are minimum requirements only. Their frequency
and/or scope may be increased, if necessary, to meet and/or maintain the level of storm water
quality treatment required of this project.
All costs associated with the operation and maintenance of the pollutant control BMPs will be
funded by Kaiser Permanente in perpetuity or until the project is sold to another entity where the
responsibility would transfer with the sale of the property or an individual parcel.
The project's owner, Kaiser Permanente, will enter into a Stormwater Facility Maintenance
Agreement as required by the City of Carlsbad, which will be executed prior to grading permit
issuance.
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
24
STORM WATER QUALITY MANAGEMENT PLAN
Biofiltration System Inspection Activities
Inspect biofiltration system
Inspect soil and repair eroded areas
Inspect for erosion or damage to vegetation, preferably at the end of the wet
season to schedule dry season maintenance and before major wet season runoff
to be sure the areas are ready for the wet season. However, additional inspection
after periods of heavy runoff is recommended.
Inspect to ensure grasses, ground covers, vegetation is well established. If not,
either prepare soil and reseed or replant with appropriate alternative species.
Install erosion control blankets if necessary.
Check for debris and litter, areas of sediment accumulation
Inspect health of trees and shrubs and vegetation
Inspect system cleanouts and outfall structures
Inspect for standing water and vectors
Biofiltration System Maintenance Activities
Remove litter and debris in conjunction with regularly scheduled landscape
maintenance
Irrigate biofiltration area(s) during dry season (April through October) and as
necessary to maintain vegetation during the rainy season.
Physically remove weeds
Remove sediment
Apply mulch to areas devoid of mulch, especially prior to the wet season
Replace damaged or diseased trees and shrubs
Mow turf areas, if any
Repair erosion at infl ow points
Unclog under drain system
Remove and replace dead and diseased vegetation
Replace tree stakes and wires, if any
Mulch should be replaced every 2 to 3 years or when bare spots appear
Rototill or cultivate the surface if the system does not draw down in 48 hours
KAISER PERMANENTE CARLSBAD
PARKING LOT EXPANSION
25
JUNE 2017
Recommended
Frequency
-Before/after rainy
season
-Bi-weekl y during
the rainy season
-After a rainfall
event of 0.5" or more
Monthly
Prior to rainy season
& every other month
Every other month
Every other month
Every other month
Every other month
Every other month
Recommended
Frequency
As part of routine,
regular landscape
maintenance
Every 2-3 years, or as
needed
As needed
E.12 BF-1 Biofiltration
Location: 43rd Street and Logan Avenue, San Diego, California
Description
Appendix E: BMP Design Fact Sheets
MS4 Permit Category
Bio filtration
Manual Category
Bio filtration
Applicable Performance
Standard
Pollutant Control
Flow Control
Primary Benefits
Treatment
Volume Reduction (Incidental)
Peak Flow Attenuation (Optional)
Biofiltration (Biorctcntion with underdrain) facilities arc ,·egetated surface water systems that filter
water through vegetation, and soil or engineered media prior to discharge ,·ia underdrain or overflow
to the downstream cotweyance system. Bioretention with underdrain facilities arc commonly
incorporated into the site within parking lot landscaping, along roadsides, and in open spaces. Because
these types of facilities have limited or no infiltration, they are typically designed to provide enough
hydraulic head to move flows through the underdrain connection to the storm drain system.
Treatment is achieved through filtration, sedimentation, sorption, biochemical processes and plant
uptake.
Typical biorctcntion with underdrain components include:
• Inflow distribution mechanisms (e.g, perimeter flow spreader or filter strips)
• Energy dissipation mechanism for concentrated inflows (e.g., splash blocks or riprap)
• Shallow surface ponding for captured flows
• Side slope and basin bottom vegetation selected based on expected climate and ponding depth
• N on-floating mulch layer (Optional)
• Media layer (planting mix or engineered media) capable of supporting vegetation growth
• Filter course layer consisting of aggregate to prevent the migration of fines into uncompactcd
native soils or the aggregate storage layer
• Aggregate storage layer with underdrain(s)
• Impermeable liner or uncompacted nati,·e soils at the bottom of the fa cility
E-66 February 2016
• 0Yerflow structure
CURB
PLAN
NOTTO SCALE
Appendix E: BMP Design Fact Sheets
.. .. .. ... . . ...
MAINTENANCE .,
ACCESS
JAS tJEE,?EDJ .,
.3H:1V(MIN.) .,
:•:•:•:•:•:•:•:•:•:•:•:•:•:•:•:•:•:•:•:•:•:• •!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•! ::::::::::::::::::::::::::::::::::::::::::::
························•········••···•····· ······························•···········•· ··•···································•····· ··-········································· .. ~ ... • .. •···································· ::::::::::=r:::;:::::::::::::::::::::::::::: :•!•!•!•!•!•!•!•:•:"'·•:•!•!•!•!•!•!•!•!•!•!• •!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!·:·:
··•········································· ····················•······················· "•·········································· "•·········································· "•·········································· :::::::::::::::::::::::::::::::::::::::::::: ::::::::::::::::::::::::::::::::::::::::::::
"•·········································· ::::::::::::::::::::::::::::::::::::::::::::
······················•·•··················· ············································ •···································•······· ·······•············•·····•····•············ ·····························•···········•·· ····•··•···································· ··•·••··········•··························• ············································ ,.•.•········································ ::::::::::::::::::::::::::::::::::::::::::::
"•·········································· "•·········································· "•·········································· "•·········································· ::::::::::::::::::::::::::::::::::::::::::::
•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•!•:
·······························•······•····· "•·········································· ·····•································•····· "•·········································· "•··········································
MEDIA SURFACE AREA
4-6" DROP FROM CURB CUT TO APRON
APRON FOR ENERGY DISSIPATION 2" MIN. FREEBOARD
CURB CUT
EXCAVATED SLOPE
(SHOWN AT1H:1V) ,
MIN. 18" MEDIA WITH T,', MIN. 5 IN/HR ',,
FILTRATION RATE , __
SATURATED STORAGE
(OPTIONAL)
Fil TER COURSE
AGGREGATE STORAGE LAYER
3" WELL-AGED, SHREDDED
HARDWOOD MULCH
(OPTIONAL) MAINTENANCE
ACCESS
(AS NEEDED)
,' I , I
///~ ~i~,
~~--\_ IMPERMEABLE LINER (OPTIONAL)
MIN. 3" AGGREGATE BELOW UNDERDRAIN
MIN. 6" DIAMETER UNDERDRAIN
EXISTING UNCOMPACTED SOILS
SECTION A-A'
NOTTO SCALE
Typical plan and Section view of a Biofiltration BMP
E-67 February 2016
Appendix E: BMP Design Fact Sheets
Design Adaptations for Project Goals
Biofiltration Treatment BMP for storm water pollutant control. The system is lined or un-lined
to provide incidental infiltration, and an underdrain is proYided at the bottom to carry away filtered
runoff. This configuration is considered to provide biofiltration treatment via flow through the media
layer. Storage provided above the underdrain within surface ponding, media, and aggregate storage is
considered included in the biofiltration treatment volume. Saturated storage within the aggregate
storage layer can be added to this design by raising the underdrain above the bo ttom of the aggregate
storage layer or via an internal weir structure designed to maintain a specific water level elevation.
Integrated storm water flow control and pollutant control configuration. The system can be
designed to provide flow rate and duration control by primarily prm,iding increased surface ponding
and/ or having a deeper aggregate storage layer above the underdrain. This will allow for significant
detention storage, which can be controlled via inclusion of an outlet structure at the downstream end
of the underdrain.
Design Criteria and Considerations
Bioretention with underdrain must meet the foUowing design criteria. Deviations from the below
criteria may be approved at the discretion of the City Engineer if it is determined to be appropriate:
Siting and Design
•
•
•
Placement observes geotcchnical
recommendations regarding potential hazards
(e.g., slope stability, landslides, liquefaction
zones) and setbacks (e.g., slopes, foundations,
utilities).
An impermeable liner or other hydraulic
restriction layer is included if site constraints
indicate that infiltration or lateral flows should
not be allowed.
Contributing tributary area shall be :S 5 acres
(:S 1 acre preferred).
E-68
Intent/Rationale
Must not negatively impact existing site
geotechnical concerns.
Lining prevents storm water from
impacting groundwater and/ or sensiti,-e
environmental or geocechnical features.
Incidental infiltration, when allowable,
can aid in pollutant removal and
groundwater recharge.
Bigger BMPs require additional design
features for proper performance.
Contributing tributary area greater than 5
acres may be allowed at the discretion of
the City Engineer if the following
conditions arc met: 1) incorporate design
features ( e.g. flow spreaders) to
minimizing short circuiting of flows in
February 2016
Sidng and Design
• Finish grade of the facility is :'.S 2%.
Surface Ponding
•
•
•
•
Surface ponding is limited to a 24-hour
drawdown time.
Surface ponding depth is ~ 6 and :'.S 12 inches.
A minimum of 2 inches of free board is
provided.
Side slopes arc stabilized with vegetation and
are= 3H:1 V or shallower.
Vegetation
E-69
Appendix E: BMP Design Fact Sheets
Intent/Radonale
the BMP and 2) incorporate additional
design features reguested by the City
Engineer for proper performance of the
regional BMP.
Flatter surfaces reduce erosion and
channelization within the facility.
Surface ponding limited to 24 hours for
plant health. Surface ponding drawdown
time greater than 24-hours but less than
96 hours may be allowed at the
discretion of the City Engineer if
certified by a landscape architect or
agronomist.
Surface ponding capacity lowers
subsurface storage reguirements. Deep
surface ponding raises safety concerns.
Surface ponding depth greater than 12
inches (for additional pollutant control
or surface outlet structures or flow-
control orifices) may be allowed at the
discretion of the City E ngineer if the
following conditions are met: 1) surface
ponding depth drawdown time is less
than 24 hours; and 2) safety issues and
fencing reguirements are considered
(typically ponding greater than 18" will
reguire a fence and/ or flatter side slopes)
and 3) potential for elevated clogging risk
is considered.
Frecboard provides room for head over
o,·erflow structures and minimizes risk
of uncontrolled surface discharge.
Gentler side slopes are safer, less prone
to erosion, able to establish vegetation
more guickly and easier to maintain.
February 2016
Sidng and Design
•
•
Plantings are suitable for the climate and
expected ponding depth. A plant list to aid in
selection can be found in Appendix E.20.
An irrigation system with a connection to
water supply should be provided as needed.
Mulch (Optional)
•
A minimum of 3 inches of well-aged, shredded
hardwood mulch that has been stockpiled or
stored for at least 12 months is proYided.
Media Layer
•
Media maintains a minimum filtration rate of 5
in/hr oYer lifetime of facility. An initial
filtration rate of 8 to 12 in/hr is recommended
to allow for clogging over time; the initial
filtration rate should not exceed 12 inches per
hour.
Media is a minimum 18 inches deep, meeting
either of these two media specifications:
Appendix E: BMP Design Fact Sheets
lntent/Radonale
Plants suited to the climate and ponding
depth arc more likely to survive.
Seasonal irrigation might be needed to
keep plants healthy.
Mulch will suppress weeds and maintain
moisture for plant growth. Aging mulch
kills pathogens and weed seeds and
allows the beneficial microbes to
multiply.
A filtration rate of at least 5 inches per
hour allows soil to drain between events.
The initial rate should be higher than
long term target rate to account for
clogging over time. However an
excessively high initial rate can have a
negative impact on treatment
performance, therefore an upper limit is
needed.
City of San Diego Storm Water Standards A deep media layer provides additional
•
r\ppendi.,-..;: F (February 2016, unless superseded filtration and supports plants with deeper
by more recent edition) or County of San
Diego Low lmpact Development Handbook:
Appendix G -Bioretention Soil Specification
(June 2014, unless superseded by more recent
edition).
Alternatively, for proprietary designs and
custom media mi.,,es not meeting the media
specifications contained in the 2016 City o f
San Diego Storm Water Standards or County
LID Manual, the media meets the pollutant
treatment performance criteria in Section F.1.
E-70
roots.
Standard specifications shall be followed.
For non-standard or proprietary designs,
compliance with P.1 ensures that
adeguatc treatment performance will be
provided.
February 2016
Siting and Design
•
•
Media surface area is 3% of contributing area
times adjusted runoff factor or greater.
Where receiving waters arc impaired or have a
TMDL for nutrients, the system is designed
with nutrient sensitive media design (sec fact
sheet BF-2).
Filter Course Layer
•
•
•
A filter course is used to prevent migration of
fines through layers of the facility. Filter fabric
is not used.
Filter course is washed and free of fines.
----------
Pilter course calculations assessing suitability
for particle migration prevention have been
completed.
Aggregate Storage Layer
•
Class 2 Permeable per Caltrans specification
68-1.025 is recommended for the storage layer.
Washed, open-graded crushed rock may be
used, however a 4-6 inch washed pea gravel
E-71
Appendix E: BMP Design Fact Sheets
Intent/Rationale
Greater surface area to tributary area
ratios: a) maximizes volume retention as
required by the MS4 Permit and b)
decrease loading rates per square foot
and therefore increase longevity.
Adjusted runoff factor is to account for
site design BMPs implemented upstream
o f the BMP (such as rain barrels,
impervious area dispersion, etc.). Refer
to Appendi.'I{ B.2 guidance.
Use Worksheet B.5-1 Line 26 to estimate
the minimum surface area required per
this criteria.
Potential for pollutant export is partly a
fu nction of media composition; m edia
design must minimize potential for
export of nutrients, particularly where
rccei,Ting waters arc impaired for
nutrients.
Migration of media can cause clogging of
the aggregate storage layer void spaces or
subgrade. Filter fabric is more likely to
clog.
Washing aggregate will help eliminate
fines that could clog the facility and
impede infiltration.
Gradation relationship between layers
can eYaluate factors (e.g., bridging,
perm eability, and uniformity) to
determine if particle sizing is appropriate
or if an intermediate layer is needed.
Washing aggregate will help eliminate
fines that could clog the aggregate
storage layer void spaces or subgrade.
February 2016
Siting and Design
•
filter course layer at the top of the crushed
rock is required.
The depth of aggregate provided (12-inch
typical) and storage layer configuration is
adequate for providing conveyance for
u nderdrain flows to the outlet structure.
In.iow, Underdrain, and Out.iow Structures
•
•
•
•
•
•
•
•
Inflow, underdrains and outflow structures are
accessible for inspection and maintenance.
Inflow velocities arc limited to 3 ft/ s or less or
use energy dissipation methods. (e.g., riprap,
level spreader) for concentrated inflows.
Curb cut inlets are at least 12 inches wide, have
a 4-6 inch re,,eal (drop) and an apron and
energy dissipation as needed.
Underdrain outlet elevation should be a
minimum of 3 inches above the bottom
elevation of the aggregate storage layer.
Minimum underdrain diameter is 6 inches.
Underdrains are made of slotted, PVC pipe
conforming to ASTM D 3034 or equinlent or
corrugated, HDPE pipe conforming to
A , \SHTO 252M or equivalent.
An underdrain clcanout with a minimum 6-
inch diameter and lockable cap is placed every
250 to 300 feet as required based on
underdrain length.
Overflow is safely conveyed to a downstream
storm drain system or discharge point Size
overflow structure to pass 100-year peak flow
E-72
Appendix E: BMP Design Fact Sheets
Intent/Rationale
Proper storage layer configuration and
underdrain placement will minimize
facility drawdown time.
Maintenance will prevent clogging and
ensure proper operation of the flow
control structures.
High inflow velocities can cause erosion,
scour and/ or channeling.
Inlets must not restrict flow and apron
prevents blockage from vegetation as it
grows in. Energy dissipation prevents
erosion.
A minimal separation from subgradc or
the liner lessens the risk of fines entering
the undcrdrain and can improve
hydraulic performance by allowing
perforations to remain unblocked.
Smaller diameter underdrains are prone
to clogging.
Slotted underdrains provide greater
intake capacity, clog resistant drainage,
and reduced entrance velocity into the
pipe, thereby reducing the chances of
solids migration.
Properly spaced clcanouts will facilitate
underdrain maintenance.
Planning for overflow lessens tl1c risk of
property damage due to flooding.
February 2016
Sidng and Design
for on-line infiltration basins and water guality
peak flow for off-line basins.
Appendix E: BMP Design Fact Sheets
Intent/Rationale
Conceptual Design and Sizing Approach for Storm Water Pollutant Control Only
To design bioretention with underdrain for storm water po llutant control only (no flow control
required), the following steps should be taken:
1. Verify that siting and design criteria have been met, including placement requirements,
contributing tributary area, maximum side and finish grade slopes, and the recommended
media surface area tributary ratio.
2. Calculate the DCV per Appendix B based on expected site design runoff for tributary areas.
3. Use the sizing worksheet presented in Appendi.,-x B.5 to size biofiltration BMPs.
Conceptual Design and Sizing Approach when Storm Water Flow Control is Applicable
Control of flow rates and/ or durations will typically require significant surface ponding and/ or
aggregate storage volumes, and therefore the following steps should be taken prior to determination
of storm water pollutant control design. Pre-de,,elopment and allowable post-project flow rates and
durations should be determined as discussed in Chapter 6 of the manual.
1. Verify that siting and design criteria ha,'e been met, including placement requirements,
contributing tributary area, maximum side and finish grade slopes, and the recommended
media surface area u-ibutary ratio.
2. Iteratively determine the facility footprint area, surface ponding and/ or aggregate storage layer
depth required to provide detention storage to reduce flow rates and durations to allowable
limits. flow rates and durations can be controlled from detention storage by altering outlet
structure orifice size(s) and/ or water control levels. Multi-level orifices can be used within an
outlet structure to conu·ol the full range of flows.
3. If bioretention with underdrain cannot fully provide the flow rate and duration control
reguired by this manual, an upsu·eam or downstream structure with significant storage volume
such as an underground vault can be used to provide remaining controls.
4. After bioretention with underdrain has been designed to meet flow control requirements,
calculations must be completed to verify if storm water pollutant control requirements to treat
the D CV have been met.
E-73 February 2016
Appendix E: BMP Design Fact Sheets
E.13 BF-2 Nutrient Sensitive Media Design
Some studies of bioretention with underdrains have observed export of nutrients, particularly
inorganic nitrogen (nitrate and nitrite) and dissolved phosphorus. This has been observed to be a
shore-lived phenomenon in some studies or a long term issue in some studies. The composition of
the soil media, including the chemistry of individual elements is believed to be an important factor in
the potential for nutrient export. Organic amendments, often compost, have been identified as the
most likely source of nutrient export. The quality and stability of organic amendments can vary widely.
The biofiltration media specifications contained in the County of San Diego Low Impact
Development Handbook: .Appendix G -Bioretention Soil Specification Qune 2014, unless superseded
by more recent edition) and the City of San Diego Low Impact D e,~elopment Design Manual (page
B-18) Uuly 2011, unless superseded by more recent edition) were developed with consideration of the
potential for nutrient export. These specifications include criteria for individual component
characteristics and c1uality in order to control the overall quality of the blended mi,-xes. As of the
publication of this manual, the June 2014 County of San Diego specifications provide more detail
regarding mi,-x design and quality control.
The City and County specifications noted above were developed for general purposes to meet
permeability and treatment goals. In cases where the BMP discharges to receiving waters with nutrient
impairments or nutrient TMDLs, the biofiltration media should be designed with the specific goal of
minimizing the potential for export of nutrients from the media. Therefore, in addition to adhering to
the City or County media specifications, the following guidelines should be followed:
1. Select plant palette to minimize plant nutrient needs
A landscape architect or agronomist should be consulted to select a plant palette that minimizes
nutrient needs. Utilizing plants with low nutrient needs results in less need to enrich the biofiltration
soil mL-X. If nutrient quantity is then tailored to plants with lower nutrient needs, these plants will
generally have less competition from weeds, which typically need higher nutrient content. The
foll owing practices are recommended to minimize nutrient needs of the plant palette:
• Utilize native, drought-tolerant plants and grasses where possible. Native plants
generally have a broader tolerance for nutrient content, and can be longer lived in
leaner/lower nutrient soils.
• Start plants from smaller starts or seed. Younger plants are generally more tolerant of
lower nutrient levels and tend to help develop soil structure as they grow. Given the lower
cost of smaller plants, the project should be able to accept a plant mortality rate that is
somewhat higher than starting from larger plants and providing high organic content.
2. Minimize excess nutrients in media mix
Once the low-nutrient plant palette is es tablished (item 1 ), the landscape architect and/ or agronomist
should be consulted to assist in the design of a biofiltration media to balance the interests of plant
E-74 February 2016
Appendix E: BMP Design Fact Sheets
establishment, water retention capacity (irrigation demand), and the potential for nutrient export. The
following guidelines should be followed:
• The mix should not exceed the nutrient needs of plants. In conventional landscape
design, the nutrient needs of plants are often exceeded intentionally in order to provide a
factor of safety for plant sun·ival. This practice must be avoided in biofiltration media as excess
nutrients will increase the chance of export. The mi,'{ designer should keep in mind that
nutrients can be added later (through mulching, tilling of amendments into the surface), but it
is not possible to remove nutrients, once added.
• The actual nutrient content and organic content of the selected organic amendment
source should be determined when specifying mix proportions. Nutrient content (i.e.,
C:N ratio; plant extractable nutrients) and organic content (i.e, % organic material) are
relatively inexpensi,·e to measure via standard agronomic methods and can provide important
information about mi.,x design. If mix design relies on approximate assumption about
nutrient/organic content and this is not confirmed with testing (or the results of prior
representative testing), it is possible that the mix could contain much more nutrient than
intended.
• Nutrients are better retained in soils with higher cation exchange capacity. Cation
exchange capacity can be increased through selection of organic material with naturally high
cation exchange capacity, such as peat or coconut coir pith, and/ or selection of inorganic
material with high cation exchange capacity such as some sands or engineered minerals (e.g.,
low P-index sands, zeolites, rhyolites, etc). Including higher cation exchange capacity materials
would tend to reduce the net export of nutrients. Natural silty materials also provide cation
exchange capacity; however potential impacts to permeability need to be considered.
• Focus on soil structure as well as nutrient content. Soil structure is loosely defined as the
ability of the soil to conduct and store water and nutrients as well as the degree of aeration of
the soil. Soil structure can be more important than nutrient content in plant survival and
biologic health of the system. If a good soil structure can be created with very low amounts of
organic amendment, plants survivability should still be provided. While soil structure generally
develops with time, biofiltration media can be designed to promote earlier development of
soil structure. Soil structure is enhanced by the use of amendments with high humus content
(as found in well-aged organic material). ln addition, soil structure can be enhanced through
the use of organic material with a distribution of particle sizes (i.e., a more heterogeneous mix).
• Consider alternatives to compost. Compost, by nature, is a material that is continually
evolving and decaying. It can be challenging to determine whether rests previously done on a
given compost stock are still representative. It can also be challenging to determine how the
properties of the compost will change once placed in the media bed. More stable materials
such as aged coco coir pith, peat, biochar, shredded bark, and/ or other amendments should
be considered.
With these considerations, it is anticipated that less than 10 percent organic amendment by ,·olume
E-75 February 2016
Appendix E: BMP Design Fact Sheets
could be used, while still balancing plant survivability and water retention. If compost is used,
designers should strongly consider utilizing less than 10 percent by volume.
3. Design with partial retention and/ or internal water storage
An internal water storage zone, as described in Fact Sheet PR-1 is believed to improve retention of
nutrients. For lined systems, an internal water storage zone worked by providing a 7.one that fluctuates
between aerobic and anaerobic conditions, resulting in nitrification/ denitrification. In soils that will
allow infiltration, a partial retention design (PR-1) allows significant volume reduction and can also
promote nitrification/ denitrification.
Acknowledgment: This fact sheet has been adapted from the Orange Count\' Technical Guidance
D ocument (May 2011). It was originally developed based on input from: Deborah Deets, Cit)' of Los
Angeles Bureau of Sanitation, Drew Ready, Center for Watershed Health, Rick Fisher, ASLA, City of
Los Angeles Bureau of Engineering, Dr. Garn Wallace, Wallace Laboratories, Glen Dake, GDi\fL,
and Jason Schmidt, Tree People. The guidance provided herein docs not reflect the individual opinions
of any individual listed above and should not be cited or otherwise attributed to those listed.
E-76 February 2016
Appendix E: BMP Design Fact Sheets
E.14 BF-3 Proprietary Biofiltration Systems
The purpose of this fact sheet is to help explain the potential role of proprietary BMPs in meeting
biofiltration requirements, when full retention of the DCV is not fea sible. The fact sheet does not
describe design criteria like the other fact sheets in this appendL"X because this information varies by
BMP product model.
Criteria for Use of a Proprietary BMP as a Biofiltration BMP
A proprietary BMP may be acceptable as a "biofiltration BMP" under the following conditions:
(1) The BMP meets the minimum design criteria listed in Appendix F, including the pollutant
treatment performance standard in Appendix F. 1;
(2) The BMP is designed and maintained in a manner consistent with 1ts performance
certifications (See explanation in Appendi"< F.2); and
(3) The BMP is acceptable at the discretion of the City Engineer. In determining the
acceptability of a BMP, the City Engineer should consider, as applicable, (a) the data
submitted; (b) representati,·eness of the data submitted; (c) consistency of the BMP
performance claims with pollutant control objectives; certainty of the BMP performance
claims; (cl) for projects within the public right of way and/or public projects: maintenance
requirements, cost of maintenance activities, relevant previous city experience with operation
and maintenance of the BMP type, ability to continue to operate the system in event that the
vending company is no longer operating as a business; and (e) other relevant factors.
Guidance for Sizing a Proprietary BMP as a Biofiltration BMP
Proprietary biofiltration B°NOJs must meet the same sizing guidance as non-proprietary BMPs. Sizing
is typically based on capturing and treating 1.50 times the DCV not reliably retained. Guidance for
sizing biofiltration BMPs to comply with requirements of this manual is provided in ,-\ppendi"X F.2.
E-77 February 2016
.. • TREATMENT CONTROL BMP ..
""""""' . ~-VERIFICATION FORM . Pursuant to CMC 15.12.100 • •
C ownerName
GENERAL INFORMATION
Owner Address City and Zip
Contact Name Contact Phone
New Contact New Phone
BMP INFORMATION
1 ·• BMPType BMP ID# I I Prioritv I
BMP Description Manufacturer
BMP Location BMP
Address
BMP Approval Date I Last Inspection Date Maintenance Freauencv I
Comments
j
~ BMP VERIFICATION AND MAINTENANCE
(/J 0 t-~ ~ w zo
>-z Oz z
C !lii::
BMP ACTIVITY COMMENTS
1 Has the BMP been installed?
Has the BMP been removed?
Is the BMP ooeratinq orooerlv?
Has the BMP been replaced? If so when?
11 ls BMP covered under a maintenance aqreement?
1 ls the BMP on a reqular maintenance schedule?
I
~
Has trash or other debris accumulated in or around BMP?
Has the BMP been inspected durinq the last vear?
Has the BMP been maintained or cleaned durinq the last vear?
Are discharqe points free of litter and debris?
Has it rained since the last time the BMP was maintained?
L Leaking Vehicles
Erosion/Sediments [ Trash and Debris
What are the sources of pollution that could impact the BMP? Over Irrigation D Improvement Projects (paint,
~ Pet/Animal Waste
concrete wash, landscaping, etc.)
[J Lawn clippings and yard waste
Other
Certification Statement
"I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in
accordance with a system to assure that the responsible party gathered and evaluated the information submitted. Based on
my inquiry of the person or person who managed the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief true, accurate and complete, I am aware that
there are sianificant oenalties for submittina false information includina the oossibilitv of fines and other enforcement actions."
PRINT NAME: SIGNATURE
Please return the completed and signed form to the
City of Carlsbad
CMI -Storm Water Compliance
5950 El Camino Real
Carlsbad, CA 92008
760-602-2780 or FAX 760-438-7178
DATE
Attachment 3b
..__ Draft Stormwater Maintenance Agreement
EXHIBIT "A"
PR
PROPERTY
LEGAL DESCRIPTION
LOTS 11, 12 AND 13 OF CARLSBAD TRACT NO. 81-5, IN THE CITY OF CARLSBAD, COUNTY
OF SAN DIEGO, STA TE OF CALIFORNIA, MAP NO. 10899, RECORD ED , APRIL 11, 1984.
PAUL E. GOEBEL, PLS 8548
5/8/17 -------------------------------DATE:
PASCO LAREY SUITER
------& ASSOCIATES PH. 858.259.8212 I PLSAENGINEERING.COM PLSA JOB NO. 2512
KAISER M.O.8.-PARKING LOT EXPANSION
STORM WATER MANAGEMENT AGREEMENT
SHEET 1 OF 1
OCEAN
EXHIBIT "B"
PR __ -__
CITY OF OCEANSIDE
NOT TO
SCALE
7a
SITE
~ VICINITY MAP
NO SCALE
CITY OF ENCINITAS
NOTE OWNER/APPLICANT
REFER TO DWG NO. ______ ON KAISER FOUNDATION HEAL TH PLAN, INC.
8010 PARKWAY DRIVE FILE WITH THE CITY OF CARLSBAD
~ FOR ADDITIONAL DETAILS. LA MESA, CA 91942
PAUL E. GOEBEL, PLS 8548
5/8/17 -------------------------------DATE:
CITY OF VISTA
PASCO LAREY SUITER KAISER M.O.B.-PARKING LOT EXPANSION
STORM WATER MANAGEMENT AGREEMENT
& ASSOCIATES
PH. 858.259.8212 I PLSAENGINEERING.COM PLSA JOB NO. 2512 SHEET 1 OF 3
\
40'
I
\
\
\
\
\
20'
I
\
\ ~
\
\
\
()
?
\
\
0 40'
~ I
GRAPHIC SCALE:
PASCO LAREY SUITER
& ASSOCIATES
PH. 858.259.8212 I PLSAENGINEERING.COM
EXHIBIT "B"
PR __ -__
BUILD/NGA
(EXl811NG
2-STORY
MEDICAL OFFICE) -
BUILDING B
(EXl811NG
2-STORY
MEDICAL OFFICE)
@
-----· ~----------
~ ---
,! -\ ---------
\ ~ ~ __.....-f',~-
BMP SITE PLAN
SCALE: 1 "=40'
80' 120'
I I
1"=40'
PLSA JOB NO. 2512
KAISER M.0.B.-PARKING LOT EXPANSION
STORM WATER MANAGEMENT AGREEMENT
SHEET 2 OF 3
EXHIBIT "B"
PR __ -__
1 ·J.,
~c't'¼'.c's 100-YR PONDING 0 1t-ff'sc'S DEPTH (VARIES)
EXTEND PVC_____,....... ---
LINER UP TO "'-.:
PONDING DEPTH '-.:
WIDTH VARIES PER PLAN
US.--_._.~-18-INCH THICK LA YER
OF BIORETENTION SOIL
MEDIA. SANDY LOAM,
POROSITY=O. 4
8"-THICK
STORAGE
LAYER OF
#57 STONE
4" PERFORATED
SUBDRAIN
3"-THICK
STORAGE LA YER
OF #57 STONE,
BELOW OUTLET
FIELD CAPACITY=0.2
WILTING POINT=0.1
CONDUCTIVITY=5IN/HR
4"-THICK LA YER OF
"BIRDSEYE" WASHED
PEA GRAVEL-CHOKER
STONE LAYER
BROOKS BOX INLET
STRUCTURE SIZED PER
PLANS. TOP OF GRATE
AND INVERT ELEVATIONS
VARY PER PLANS.
~ BIO-FIL mA T/ON BASIN ~°;':a ~f:ERMEABLE LINER DETAIL
~
PASCO LAREY SUITER
& ASSOC IA TES
PH. 858.259.8212 I PLSAENGINEERING.COM PLSA JOB NO. 2512
KAISER M.0.8.-PARKING LOT EXPANSION
STORM WATER MANAGEMENT AGREEMENT
SHEET 3 OF 3
Attachment 4
..___ City Standard Single Sheet BMP Exhibit
@
I
0 I IO I \ \__ ' I I '
1lf I lo
EXISTING
;1., DRIVEWAY I jl 1 I I
I
-
!\
I ' I{ i I ' ' !
-
@
:;;:i
I
-0 z .i
I
I
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I I rLJ-"1 . . I \~ ry
I , / ! ~ BUILDINGS j! //
I I
I I
I I
I I
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I I
, .JIL ~-0 (E}(/ST1NG 2-STORY LOT 11 . li ~~ I MEDICAL OFRCE) / ~ 10899
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n 11
' ' I, I .;-· I
II
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LINED BIOFIL TRA TION
BMP (360 SF)
AVENIDA
°'<:-[I , I•
----ld------_j,~ ;'/ l I
I I
1 I /
EXlS11NG
ELEVATOR
AND
STAIRS
f
I I
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f,
I\ I
I \
I /
/
"' !
'~f~-~ -~f!F= -~ ---===o e i-,---
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• + +
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!ii / / \ .J \
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PROPOSED
TRENCH DRAIN
I
\ ' \
1 I
I ' I
I EXISTING STORM
I I
ENCINAS
DRAIN INLET
\
LINED BIOFIL TRA TION
BMP (46 SF)
\
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~
"'---111 _C/L
111
PLAN VIEW
SCALE: 1" = 20'
PASCO LARET SUITER
& ASSOCIATES
CIVIL ENGINEERING + LAND PLANNING + LAND SURVEYING
535 North Highway 101, Ste A, Solana Beach, CA 92075
ph 858.259.8212 I fx 858.259.4812 I plaaenglneerlng.com
GR2017-0030 I CD2017-0003
PARTY RESPONSIBLE FOR MAINTENANCE:
KAISER FOUNDATION HEALTH PLAN, INC.
8010 PARl'N>/AY DRIVE
LA MESA, CA 91942
(619) 315--9316
CONTACT: KATHERINE CLARK
PLAN PREPARED BY:
PASCO LARET SUITER & ASSOCIATES
535 N. HWY 101, SUITE A
SOLANA BEACH, CA 92075
(858)-259-8212
BMPNOTES:
1. THESE BMPS ARE MANDATORY TO BE INSTALLED PER MANUFACTURER'S
RECOMMENDATIONS OR THESE PLANS.
2. NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR
APPROVAL FROM THE CITY ENGINEER.
3. NO SUBSTITUTIONS TO THE MATERIAL OR TYPES OR PLANTING TYPES
WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER
4. NO OCCUPANCY WILL BE GRANTED UNTIL THE CITY INSPECTION STAFF
HAS INSPECTED THIS PROJECT FOR APPROPRIATE BMP CONSTRUCTION
AND INSTALLATION.
5. REFER TO MAINTENANCE AGREEMENT DOCUMENT.
6. SEE PROJECT SWQMP FOR ADDITIONAL INFORMATION.
BMP TABLE
BMP ID# BMPTYPE SYMBOL CASQA NO. QUANTITY DRAWING NO_ SHEET NO.(S) INSPECTION
FREQUENCY
TREATMENT CONTROL (PROJECT IS EXEMPT FROM HYDROMODIFICAITON REQUIREMENTS)
. . .
(j)&(D BIORETENTION (~) TC,32 406 SF_ 504-2A 5&6 QUARTERLY AREA
SOURCE CONTROL
@-® STENCILS NO DUMPING SD-13 ---ANNUALLY DRAINS TO OCEAN
20' 10' 0
I Rd
SCALE:
MAINTENANCE
FREQUENCY
SEMI-ANNUALLY
AS-NEEDED
20' 40'
I I
1'' = 20'
~ CITY OF CARLSBAD I SHEETS I 1-----1,----+----------------t----+---t-----r----, li_j ENGINEERING DEPARTMENT 1
l-----jl----+---------------t---+---t----t-----1
SINGLE SHEET BMP SITE PLAN
KAISER PERMANENTE MO.a
(PARKING LOT EXPANSION)
PROJECT NO.
CD2017-0003 RECORD COPY
DA TE INITIAL
ENGINEER OF WORK REVISION DESCRIPTION
DA TE INITIAL DA TE INITIAL
OTHER APPROVAL CITY APPROVAL I 504~2sw I ~-----------INITIAL DATE
---------------------------------------------~ ---------~ -------·---------