HomeMy WebLinkAboutCDP 15-45; ABDI RESIDENCE; STORM WATER QUALITY MANAGEMENT PLAN; 2017-11-15I C'0f7 RECORD C
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PREPARED FOR:
I . Behrooz & Sharon Abdi
18485 Withey Road
Sereno, CA 95030 I Monte
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PREPARED BY: .
Coffey Engineering
9666 Businesspark Avenue Suite 210 RECE P/F r San Diego, CA 92131
(858)831-0111 . NOV 292017
michael@coffeyengineering.com
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A '-'-'ND DEVE.1
- .. I . ENG. INEEi-ING 11/15/2017 . .
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- TABLE OF CONTENTS
I Certification Page :
Project Vicinity Map
FORM E-34 Storm Water Standard Questionnaire
I Site Information
FORM E-36 Standard Project Requirement Checklist
Summary,of PDP Structural BMPs
I .Attachment 1: Backup for PDP Pollutant Control BMPs
Attachment la: DMA Exhibit
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• Attachment 1 b: Tabular Summary of DMAs and Design Capture Volume Calculations
.Attachment ic: Harvest and Use Feasibility Screening (when applicable)
Attachment id: Categorization of Infiltration Feasibility Condition (when applicable)
Attachment le: Pollutant Control BMP Design Worksheets / Calculations
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Attachment 2: Backup for PDP Hydromodification Control Measures .
Attachment 2a: Hydromodification Management Exhibit
Attaàhment 2b: Management of Critical Coarse Sediment Yield Areas • V
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Attachment 2c: Geomorphic Assessment of Receiving Channels V.
Attachment 2d: Flow Control Facility Design
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Attachment 3: Structural BMP Maintenance Thresholds and Actions
Attachment 4: Single Sheet BMP (SSBMP) Exhibit
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CERTIFICATION PAGE
I . Project Name: Abdi Residence
Project ID:. CDP 15-045
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
I : with the 'requirements of the BMP Design Manual, which is based on the requirements of.
SDRWQCB Order No. R9-201 3-0001 (MS4 Permit) or the current Order.
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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
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, 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 understandr and acknowledge that the plan check
review of this SWQMP by the City Eñgineér,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.. .
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i Engineer of Work's Signature, PE Number & Expiration Date
Michael C. Kinnear . .
I Print Name
-Coffey En gineering Inc.OfESSIO
Company
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PROJECT VICINITY MAP
U:. . .
r STORM WATER STANDARDS Development Services
I t,, City of
" QUESTIONNAIRE .Land Development Engineering
Carlsbad , 1635 Faraday Avenue
" E-34 - (760) 602-2750.
:
www.carlsbadca.gov
INSTRUCTIONS
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I To, address post-development'pollutants that may be generated from develôpment projects, the city requires that new.
developrnentand 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,
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'refer to the Engineering'Standards (Volume 5).
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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
I storm water standards that must be applied to a proposed development or redevelopment project Depending on the
outcome, your project will eher 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 prdposed prbject conditions and impacts City
staff has responsibility for making the final assessmeht after submission-of the development application.-'If staff
determines that the questionnaire was incoiectly filled out and is subject to more stringent storm water standards than
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initially assessed by you, this will result inthe return of the development application as incomplete. In this case, please
make the changes to the questionnaire and resubmit to the city.
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If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the
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questions, please seek assistance from Land Development Engineering staff.,
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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,,
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submitted concurrently.
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"•PROJECT :-
PRO'JECT NAME: Abdi Residence . .. PROJECT ID: CDP 15-45 / GR 2017-0010
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ADDRESS ,5623 Shore Drive Carlsbad CA 92008 APN '21b-'0'61-1300
The project is (check one) fl New Development II Redevelopment
The total proposed disturbed area is 8,207 ft2 (_0.188 ) acres -
The total proposed newly created and/or replaced impervious area is 6,396 ..ft2 0.147 ) acres
'If your project is covered byan approved SWQMP as part of a'larger development project, provide, the project ID and the
,SWQMP # of the larger development project: '' •.- ,. '- ' ..
,.Project I CDP 15-45
:
' SWQMP#
Then go to Step 1 and follow the instructions When completed sign the form at the end and submit this with your
application to the city.
-- TO'BECOMPUETEDFORAU!PROJECTS - -
Todetermine if your project is a 'development project", please answer the following question:
- YES NO
Is your project LIMITED TO routine maintenance activity and/or4repair/improvement to an existing building .
or structure that do not alter the size (See Section 1:3 of the BMP Design Manual for guidance)?
If you answered "yes" to the above question, provide justification below then go to Step 5, mark the third box stating "my
project is not a 'development project' and not subject to the requirements Of the BMP manual" and 4complete applicant
information. •. . •
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- '. . .- . . 4 - • S. Justification/discussion: (e.g. the project includes only interior remodels within an existing building):
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If you you answered "no" to the above question, the project is a 'development project',.go to Step.2. •
'STER12 U
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9 .DjEqR DEVELOPMENT 9TS........ .
To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provisiort E.3b.(3), please answer
the following questions:
Is your project LIMITED to one or more 'of the following:
"YES NO.
1. Constructing new or, retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria:
- a) Designed and constructed to direct storm water runoff to adjacent vegetated areaê, 0r other .4
erodible permeable areas-,, - . El Designed and constructed to be hydraulically disconnected from paved streets or roads; , . 91k.
Designed and constructed with permeable pavements or surfaces in accordance with USEPA
Green Streets guidance?
2. Retrofitting or.redeveloping existing paved alleys, streets, or roads that are designed and constucted in
'• accordance with the USEPA Green Streets guidance? :- -' : _____ ______
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3. Ground M6unted Solar Array that meets the criteria provided in section 1:4.2 of. the BMP manual? .
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. .
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Discussion to justify exemption ( e.g. the project rédevIoping bxistinj road designed and constructed in accordance with
the USEPA Green Streef guidance): ' .
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If jou ans'Aeréd "no" t
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o the above guestions,.your project is not exempt from PDP, go toStep 3..
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STEP3
TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS
To determine if your project is a PDP,please answer the following questions (MS4 Permit Provision E.3.b.(1)):
'YES NO
1 Is your project a new development that creates 10,000 square feet or more of impervious surfaces
collectively over the entire project site? 'This includes commercial, industrial, residential, mixed-use,
and public development projects on public or private 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 El more of impervious surface? This includes commercial,, industrial, residential, mixed-use, and public -
development projects on public or private land. -
Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more
of impervious sbrface 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 consuthption (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.
development project includes development bn any natural slope that is twenty-five percent or greater.
Is you project a new or redevelopment project that creates and/or replaces 5,000.square feet or more
of impervious surface collectively oer 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.'
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 entireproject site and supports a street, road, highway
'street, freeway or driveway? A road, highway, freeway or driveway is any paved impervious surface
used for the transportation of automobiles, trucks, motorcycles, and other vehicles. -. •. -. .
7.. Is your project a new or redevelopment project that creates and/or replaces 2,500 square feet or more
,of impervious surface collectively over the entire site, and' discharges directly to an Environmentally
Sensitive Area (ESA)? "Discharging Directly to" includes flow that is conveyed overland a distance of I1.
200 feet or less from the project to the ESA,'or conveyed in a pipe or open channel any distance as an
isolated flow from the project'to the ESA (i. e. not commingled with flows from adjacent lands).*
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 ' El .91 shop isa facility that is categorized in any one of the following Standard Industrial Classification (SIC)
codes: 5013, 5014, 5541, 7532-7534, or 7536-7539. . ' , ,
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 El 0 RGO'sthat meet the following criteria: (a) 5,000 square feet or more or (b), a project Average Daily
Traffic (ADT) of 100 or more vehicles per da'y.
10: Is your project a new or redevelopment project that results in the disturbance of one ormore acres of land
and are expected to generate pollutants post construction? 91 El-
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 91 El 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 alLof the above queétions, your projectis a 'STANDARD PROJECT.' Go to step 5, check the
second box stating "My project is a 'STANDARD PROJECT.....and complete applicant information.
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1rOtBE1COMPLETEbFOR.1REDEVELOPMENT'PROJECTS'THAT ARE FRIORlTY'DEVELOPMENT-RROJECTS'(PDP)
ONL-Y
Complete the questions below regarding your redevelopment project (MS4 Permit Provision E:3.b.(2)):
YES NO
Does the redevelopment project result in the creation or replacement of impervious surface in an amount
of less than 50% of the' surface area of the previously' existing development? Complete the percent
impervious calculation below:
-' 5,648 Existing impervious area (A) = sq. ft
Total proposed newlycreated or replaced impervióus'area (B) 6,396,. sq ft.
Percent impervious area created or replaced (B/A)*100 = 113 %
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 stating "Mi' project is a PDP and complete applicant information.
STEP '-----
-HECKTHEAPPROPATE.BOX AND COMPtETE APPLICANT INFORMAON1
IZ My project is a PDP and must comply with PDP stormwater requirements of the BMP Manual. I unierstaridlmust
prepare a Storm Water Quality Management Plan (SWQMP) for submittalat time of application. ' ••
EI.My project is aSTANDARD PROJECT' OR EXEMPT from PDP and rhust only comply with STANDARD PROJECT'
stormwater requirements bf the BMP Manual.. As part.of these requirements, I will submit a "Standard Project
Requirement Checklist Form E-36" and incorp'orate low impact development strategies throughout my project.
Note: For projects .that are chseto meeting'the PDP threshold, staff may require detailed impervious area calculations
and exhibits to verify if 'STANDARD PROJECT' stormwater requirements apply.
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My Prbjet is NOT a-deveIoment project' and is not subject to the requireménts" of. the BMP Manual.
Applicant Information and Signature Box
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Applicant Name Michael Kinnear-Coffey Engineering Applicant Title Civil Engineer
Applicant Signature .::'// Date (ZZ( (7
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Environmentally Sensitive Areas include but are not limited to all Clean 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 pteserves 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.
I ' This Box for City Use Only
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City Concurrence:
'YES, /NOi
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Date:
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Project ID:CDP
SITE INFORMATION CHECKLIST
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Project Name Abdi Residence
Project ID -. ' - CDP 15-45
5623 Shore Drive '. ,Project Address
4 Carlsbad CA 92008
Assessor's Pafcel Number(s) (APN(s)) AFN: 210-061-13-00
- Carlsbad 904 - Project Watershèd (Hydrologic Unit) "
Parcel Area,-. -,
- 0 286w ' ' - 2,500 . Acres (- Square Feet)
Existing Impervious Area
0.130 5648
(subset of Parcel Area) .
Acres (' Square'Feet)
Area to be distur6ed by the project -•.
(Project Area) --..
0.188 t Acre's _8,207 Square Feet)
Próject Proposed Impervious Area
(subset of Project Area)4' • - 0.147 Acres .(_6,396
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Square Feet)
Project Proposed PerviousAfea 1,811 - 0.041 Acres ( : SqLiare Feet) (subset of Project Area)
,Note: Proposed ImpeMous Area -4- Proposed Pervious Area = Area to be Disturbed b' the
Projeót.
This mac' be 1éss than the Parcel Area. • - ' .
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Current Status of the Site (select all that apply):
'Existing development
U Previously graded but not built out
El Agricultural or other non-impervious use
El Vacant, undeveloped/natural
Description/ Additional Information:.
The site is an existing single family residence.
Existing Land Cover Includes (select all that apply):
Vegetative Cover
LI Non-Vegetated Pervious Areas
Impervious Areas .
Description / Additional Information::
Existing conditions include 11,811 SF. of landscaping, and 6,396 SF of impervious
hardscape. .
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Underlying Soil belongs to Hydrologic Soil Group (select all that apply):
ElNRCS Type A .
'!'NRCS Type B
[lNRCS Type C
El NRCS Type D,
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Approximate Depth to Groundwater (GW):
ElGW Depth <5feet .
El 5 feet < GW Depth < 10 feet
Lll0 feet <GW Depth <20feet .
'GW Depth > 20 feet
Existing Natural Hydrologic Features (select all that apply):'
El Watercourses .
El Seeps
USprings ., *
ElWétlands .
'None -
Description /Additional Information:
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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]:
(1) The Abdi residence is a lot located on the southerly'portionof a corner of Shore
Drive at the top of a bluff overlooking the Pacific Ocean. The existing drainage
conveyance is characterized as urban. (2) A small portion of the lot, between the
garage and Shore Drive, drains to the street. The rest of the lot drains to an existing I'
storm drain system, discharging through the gunite at the base of the bluff.
The driveway and adjacent landscape areas drain via sheet flow into Shore-Drive. Flows
within Shore Drive travel a short distance northwesterly to an existing catch basin within
the publicstreet. This catch basin drains via an existing 24-pipe that discharges at the
base of the bluff. This system is subject to flows from the majority of the neighborhood,
and upstream development. Analysis of this system finds it to be slightly undersized for
the existing tributary flows.
On-site flows are intercepted by a series of grate inlets located throughout the yard.
While no specific pipe layout can be determined from the surface features, the point of
discharge can be located where the pipes are grouted to the slope face. The two pipes
are located within the gunite bluff edge. (Reference photos on next page.) A dip in the
rear yard landscaped area and an area directly adjacent of the top of bluff drain over the
edge and down the face of the bluff. Discharge from the pipes and drainage down the
bluff discharge onto the sand and directly into the Pacific Ocean. .
(3) There is no drainage tributary to the property from adjacent properties.
10/13/2017
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GUNITE BLUFF EDGE
Description of Prápo m sed Site Developent and Drainage Patterns
Project Description I Proposed Land Use and/or Activities:
The proposed project is the remodel and expansion of the existing residence. The proposed land
use is residential with activities typical of.a single family residence. The waste generated at the
site will be typical of any residential property. Waste will range from landscape materials to store
packaging. Waste will be contained within trash carts and picked up with weekly trash service.
List/decribe proposed impervious features of the project (e.g., buildings, roadways, parking
lots, courtyards, athletic courts, other impervious features):
The impervious ares of the project include the roof of the residence, the concrete
walkways to get to the doors, and a patio area.
List/describe proposed pervious features of the project (e.g., landscape areas):
The pervious ares of the project include the new landscape areas, and biofiltration area.
Dpes the project include grading and changes to site topography?
'6 Yes .
DNo
Description /Additional Information:
The project includes grading necessary to create a hew lower level floor area. Minor
grading will occur around the new structure to create a positive drainage to a new storm
drain system.-
Does the project include changes to site drainage (e.g., installation of new storm water
conveyance systems)?
IYes
LJNo
Descriotion I Additional Information:
The proposed drainage system maintains the existing flow patterns and discharge points.
The on-site system is removed and replaced by construction connecting to the existing
discharge pipes within the gunite bluff. The on-site system is modified to incorporate
water quality treatment facilities, as identified in this report.
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Describe path of1storm water from the project site td the Pacific Ocean-(or bay, lagoon, lake or
reservoir; as applicable).'
Water from the frohtyard arealdrains intd Shore Drive. Thiswater flows into a storm drain
that discharges in the Pacific Ocean at th6 base of the bluff. Other storm water generated
from the project site directly discharges into the Pacifió Ocean through a concrete Ii
List any 303(d) impaired water bodies within the path of storm water from the project site to the
Pacific Ocean (or bay, lagoon, lak'&or reservoir, as applicable), identify the
pollutant(s)/stressor(s) causing impairment, and ident6 any TMDLs for the impaired water.
. . '• - -. bodies:
303(d) Impaired Water Body Pollutant(s)/Stressor(s) TMDLs .
N/A •-•' . . . ... .
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Identify pollutants ahticipated from the project site based on all proposed use(s) of the site (see
BMP Design Manual Appendix B.6):- I
V Also a Réceiviñg
Not Applicable to Anticipated from the Water Pollutant of
Pollutant •. the Project Site Project Site Concern
Sediment :1 X
Nutrients
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Heavy Metals X
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Organic Compounds .
X
* - Trash & Debris & •
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- X
Oxygen Demanding
Substances
Oil & Grease. ' X
Bacteria & Viruses . ..
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- : X
I Pesticides; - V.,.. •• X r
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When applicable, list other site requirements or constraints that will influence storm water
management design, such as zoning requirements including setbacksand open space, or City
codes governing minimum streetwidth, sidewalk construction, 'allowable, pavement types, and,'
drainage requirements.
The site is constrained in that it is the reconstruction; of an existind residence on a small lot at the
top of a bluff overlooking the Pacific Ocean. Maintaining the hiinimum side yard setbacks as well
as setbacks to the'top of bluff results in minimal building footprint with a few outdoor amenities.
The existing drainage system discharges through the gurcite at the base of the bluff and cannot be
changed This, along with the inability to infiltrate, constrains the site to the system designed
or Gontuhuatioñ bf PevióuSectioñs As Needed
This space provided for, additional information or continuation of information from previous
sections as needed.
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STANDARD PROJECT' Develib'Prilent Services
I 4City of REQUIREMENT . Land D6velop'mek Engineering'
Carlsbad CHECKLIST 1535 Faraday Avenue
E36
I - Project Information
Project Name Abdi Residence
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Project ID: CDP15-45. .• ., . . . .
DWG No. br Building Permit No.: 501-8A - ,- •' .. .
Source Control BMPs
-
All development projects must implement -source control BMPs SC1- through SC-6 whereapplicable and feasible: See
Chpter 4and,Appendix E.1 of the BMP Design Manual for informationto implement source.cohtrol BMPsshowh in this-
checklist. - ' . . . ......,. . ,
-
4-
'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
4,Model BMP Design Manual. Discussion/justification is not required. .• . ,
No'- means The BMP is applicable to the project but it is not fesible to implemeht. 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 rCoitrol Requirement Applied2
SC-1 Prevention of Illicit Discharges into the MS4 : - . - : ' IZI Yes El No D N/A
Discussion/justification if SC-1 not implemented:
-. • , . - - ' ,, 4 ' .- -,
- . .. • -, ' -I • 4 - . , 4 4 ,__ -
4 4 4
I 4
- ,. . -• -' , - . •- ' - . , '
- - 4 •.
SC-2 Storm Drain Stenciling or Signage 4 IZI Yes El No El N/A
Discussion/justification if SC-2 not implemented
- .-. ,. - 4' ' . • 4 4 4
.4. . '2 .4 ''4, .4 . . •- - -, .. . .. ' . , I -
.4 4
• ,•. I , 4 ' 4 '. '4 , - . , -
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a ! . 44 •, - 44 - 4 .4 '
4 I •.
•' ,, -.. . ' -' 4 'l,? I . 4. , ' . ,
4
SC-3 .Protect'OOtdoor Materials. Storage Arè'as from Rainfall Run-On Runoff, and Wind . -
.Dispersal ' -. •.. - - - , . . - - 4 . El Yes . El No. , . Zl N/A
Discussion/justification if SC -3 not implemented
-
-.
E 36 Page 1 of 4 Revised 03/16
S.. - 1
•
,jl , 1,. ,, - ..
o- —0 t'1óIiR - '.J . :AipIiëd?
SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and
Wind Dispersal . - . . . . . .
Yes [:1 No N/A
Discussion/justification if SC -4 not implemented
-- -1
* ( ......... .
4 : •-'•_ .. - i, . - , '
. * I
SC-5 Protect Trash Storage Areas'from Rainfall,'Run-On, Runoff,and Wind Dispersal ' Yes Li No. ON/A
Discusion/justification if SC-5 not implemented:.-
..
.
. -- . ' , .1 . * ', .' . . .• . .4 .
4 . . ' ,
'. ... S - • . ' -. . S • • ... -. . - S • •, ,.
'- .5
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• • t •
. - . . . - . .
.
. ..• .. . • •• :'-
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,
.,
,l'• ::- . •, ... -- . 2' * 2 . 4 . ., .
- • .2 2 - •2•_ , 4 .. ., .-
, 1 2 -
SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed 'below and
identify additional BMPs. (See Tabl in Appendix E.1 of BMP Manual for guidance)., . •
2
121 On-site storm drain inlets - . .. . . • 121 Yes 0 No LI N/A
-
•o Interior floor drains and elevator shaft sump pumps . •. . Li Yes Li No 0 N/A
. LI Interior parking garages - '.• . . Li Yes LI No 121 N/A
LI Need for future indoor & structural,pest 'control' . 4 - . ' ',' Li Yes Li No. 121 N/A
121 Landcape/Outdoor Pesticide Use - . 121 Yes' D'No Li N/A
Z Pools, spas, ponds,decorative'fountains, and other water features . . ' 0 Yes 121 No Li N/A
LI Food service , . . ,• Li Yes Li No ) N/A
LI Refuse areas. . . : •. Li Yes -],No 12] N/A
" ,D Industrial proceses . . • , DYes- Li No 121 N/A
Li Outdoor storage àf equipment ormateriaIs'
•
V •. 0 Yes 0 No 0 N/A
Li Vehicle and Equipment Cleaning , , . - , • Li Yes LI No 121 N/A
,0 Vehicle/Equipment Repair and Maintenance Li Yes Li No 121 N/A
O Fuel Dispensing Areas -. , . 2. •• s 'Li Yes Li No 121 N/A
'. LI Loading Docks •
• . • . • . 0 Yes Li No 121 N/A-
E:]-Fire Sprinkler Test Water' • •• ' .
, LI Yes LI No 121 N/A
121 Miscellaneous Drain or Wash Water 's 4 '. 2 , ' ' -' Yes Li No Li N/A,
Li Plazas, sidewalks,and parking lots . , .. ' Li Yes Li No 121 N/A
For "Yes" answers, identify the additiOnal BM P per Appendix El? Provide 'justification for "No" answers.
, . - •2'
4 4
. , V.
2
•_ . -
4 4
storm'drain inlet located on southern edgeof property bluff edge. Drains directly to Pacific Ocean. ,
—.On-site
4 t• -' . , •2 2 • 2.. *
, 2 ' 4
- Landscape/outdoor pesticide use to be directed at existing/new landscaped areas adjacent to proposed residence.
- Miscellaneous drain/wash water has the potential to be generated per the proposed roof drains
- Spa Water to be dechlorinated before discharging to a city approved system, or landscaping where appropriate as recommended by a soils engineer - , - 2 44.. , '- ',.- .
.
'
. 4 . . ' - ' ,-, . . , , ,
. •2,
• — • I * - * - . -.
"' - 2• - 4 . -.
. .
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E-36
. .-- or •14
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4
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4 2 • ••
•I •4 4 • * 2; - , - . ' • • •. . -SI
'j• .- - I . - •
Page 2 of 4 Revised 03/16
I -
'Sit le sianOMP
-
All development projects must,implernent site design BMPs SID-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. . . .
o "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 hot required. .
'No" means the BMPs is' applicable to the project but it is not feasible to implement. Discussion/justification must be
provided. Please add attachments if more space is needed. .
••'NIA" means the BMPs is not applicable,at the project site because the project does not include the feature that is
addressed by the BMPs (e.g., the project site hasno.existing natural areas to conserve). Discussion/justification may be
provided.
Souirce:ControflRéquirenient •; ' . . Applied?
SID-11, Maintain Natural Drainage Pathways and Hydrologic Features . Yes I El No I ElN/A
Discussion/justification if SD-.1 not implemented
4
, *
- 00 • •.. - . ,. 4 • , .
I P I
, . ,4 4
I f II
SD-2 Conserve Natural Areas, Soils, and Vegetation
. I El Yes El No 'I .i N/A
Discussion/justification if SD-2 not implemented: . • . 4
'
;.
.. ._
•I
:• •I I -
, ,d •
.0• - 0 - . •1' I ' -, - ..•
I 4*,
P
I 4
SD-3 Minimize Impervious Area
. I El Yes I El No. I IZJ N/A
Discussion/justification if SD-3 not implemented:
0 1 .
4 .•, . - - . + P
4
-
.
.
SD-4 Minimize SoilCompaction . . ,.. . . .
' I IZI Yes I ElNo I El N/A•
Discussion/justification if SD-4 not implemented:.
-. -. • - •- • •
. '..-• I. 4
S • •-
.1' -j,- •.p •- •- I
O . .' 0 •, - #40 •. . S. - -r- . ) . . I • '" 0 , 1 I
.*. .
• -I + .. •0 Jo 7. +,+,
-, :4 . ., ., . . S . , .
SID -5 Impervious Area Dispersion '
- 0 .
. El Yes I El No IZI N/A'
Discussion/justification if SD-5 hot implemented:
: • . ,.
* 0)
1 , .• 4 • . I , , .•r 0 • S •
a + S + + . ., . • .' t,
- , . . ..
I- p - . 0 • • . P.,
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0 • '
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. - . - I . 0 .
0
.
.. •, 0 - 0 + • . ' ,.' . - - •..
0
*
0' -. 0 •I . . .4.
- E-36 4, . Page 3 of 4 - Revised4 03/16 I It 4+ •. • -.
Aj5Iied?
SD-6 Runoff Collection LI Yes 0 No IZ N/A
Discussion/justification if SD-6 not implemented:
SD-7 Landscaping with Native or Drought Tolerant Species FO Yes I LI No 0 N/A
Discussion/justification if SD-7 not implemented:
. .
SD-8 Harvesting and Using Precipitation. . . LI Yes I 121 No I El N/A
Discussion/justification if SD-8 not implemented:
:
Site constraints . . .
4
Revised 03/16
• • . F
F
-
-
- •. - 7
I I -. -.
I -
43
- ' •, .
'3
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1 .
H
[Continued from previous page - This page is reserved for continuation of description of general
strategy for structural BMP implementation at the site.]
(Step 2) The DCV was calculated for Basin B to properly size the biofiltration area per
Worksheet B.2-1. Harvest was deemed feasible per form 1-7. However, due.to site
constraints, there is not sufficient êpace on the site to implement sufficient harvestand
use facility. .
(Step 3) In order to determine the infiltration condition, an infiltration feasibility study-was
conducted. After geotechnical evaluation of the site, it was determined that the project
site is unsuitable for "full infiltration" or "partial infiltration" due to potential geologic
hazards. Theefore, a "no infiltration condition" was selected to compute the sizing
requirements for a biofiltration area with an impermeable liner. Since this project is
hydromod exempt, the proposed BMP design will account for pollutant control only;, no
flow control measures. .
(Step 4) Worksheet B.5-1 was used to compute the the minimum BMP footprint of the
biofiltration area required, in order to determine if it was a feasible option. The calcLlated
footprint will fit on the eastern portion of the site, abutting the retaining wall on the, back
patio. The designed biofiltration area was sized and designed based on the design
criteria and considerations presented in Appendix E to meet pollutant control
performance standards. -
I.:
I: -,
-.
'1
44*. .
.
q
I .•. .
. -.
.
1-
. •
. . 'I'
4- I 4
- . . t.rutu:IBMP S lij'fôFmatioñ
I
[Copy thisage as fleédêdtocrovlde inforTnãtioh fr each ihdividuaIroposed
stTuêtuiaIJBMP]
Structural BMP ID No (BF-1)
DWG 501-8A Sheet No. 5,8 . . I Type of structural BMP
0 Retention by harvest and use (HU-1)
I
S. Retention by infiltration basin (INF-i) 4.
- .0 Retention by bioretention (INF-2) . . : - • .'.
4.'. 0 Retention by permeable pavement (lNF-3) . . .•
0 Partial retention by biofiltration with partial retention (PR-1),
4 Biofiltration (BF-*l) $
0 Flow-thru treatment control included as pre-treatment/forebay for an orsite retention or
I
biofiltration BMP (provide BMP type/description and indicate which onsite retention or
biofiltration BMPit serves in discussion section below)
.,, • . *
•
0 Detention pond or vault for hydromodification management
I
D Other (describe in discussion section below) I
:-. . •. . ., •
.,' ...- -...,
Purpose ,
I..
lPollutantcontrolonly' - . -- -
•. . ,. • -
0 Hydromodification control only
0 Combined pollutant control and hydromodification control 4
U Pre-treatment/forebay for another. structural BMP ,.. - .. , . . .•
I U Other (describe in discussion section below)
' Discussion:(asneeded):
I Runoff generated from Bain B will be conveyedto the biofiltration area. The PVC storm drain lines along
the northén and southern property perimeters will be gravity fed to the bkfiltratioh area. Storm water
runoff generated from the lower patio area will be pumped into thebiofiltrationárea. The biofiltration
I overflow control sub-drain will be direcN connected to the existing storm drains located on the gunite bluff,
that directly, discharge into the Pacific Ocean
U
I
10/13/2017 :
u
$
4.
. - * :. . . . ' .- *. 4 . . S •
-. .
.
. S 4
,- :.
ATTACHMENT I
I BACKUP FOR PDP POLLUTANT' CONTROL BMPS
I
. This is the cover sheet for Attachment 1.
Check which Items are Included behind this cover sheet:
Attachment Contents Checklist
Sequence
Attachment la DMA Exhibit (Required) 19 Included
See DMA Exhibit Checklist on the • back of this Attachment' cover sheet:
(24"x36" Exhibit typically required)
Attachment lb Tabular Summary of DMAs Showing 16 Included on DMA Exhibit in
- DMA ID matching DMA Exhibit, DMA Attachment la -
Area, and DMA Type (Rdquired)* U Included as Attachment 1 b,
,
. . separate from DMA Exhibit *Provides table in this AttàchmCnt OR
on DMA Exhibit in Attachment la
Attachment lc Form 1-7, Harvest and Use Feasibility 'Included
• Screening Checklist (Required unless n Not included because the entire
the entire project will use infiltration project will use infiltration BMPs
BMPs)'
Refer to Appendix B.3-1 of the BMP .
Design Manual to complete Form 1-7.
Attachment ld Form 1-81 Categorization of Infiltration 'lnbluded
Feasibility Condition (Required unless LI Not included because the entire
the project will use harvest and use project will use harvest and use
• BMPs) '. •. BMPs
Refer to, Appendices C and D of the
BMP Design Manual to complete
'Form 1-8. • . . -
Attachment le Pollutant Control BMP Design i6lncluded
Worksheets I Calculations (Required)
Refer to Appendices B and E of the '
• BMP Design Manual for structural
pollutant control BMP design
guidelines .
*
I'
I... . H. •'
Use this checklist to ensure the required information has been included on the DMA
. . ' Exhibit:
The DMA Exhibit must identify. . '
I •.
'Underlying hydrologic soil group
'Approximate depth to groundwater
'Existing natural hydrologic features (watercourses, seeps, springs, wetlands)
I 'Critical coarse sediment yield areas to be protected (if present)
6Existing topography and impervious areas
'Existing and proposed site drainage network and connections to drainage offsite
I D Proposed grading INo new grade lines I
1'Proposed impervious features
. f Proposed design features and surface treatments used to minimize imperviousness
I .'Drainage management area (DMA) boundaries, DMA ID numbers, and DMA areas (square
footage or acreage), and DMA type (i.e., drains to BMP, self-retaining, or self-mitigating)
,'Structural BMPs (identify location and type of BMP)
I
I
I
I :
I I
I
I
I
I
DRAINAGE MANAGEMENT AREA (DMA) EXHIBIT
EXISTING CONDITIONS
/
~
DMA ID
BASIN A
I XX.XX AC " Sc ~~~ 1zc: ,.~0
~~~+ <o,
"' 0 10 20 40 60
I I I I I
SCALE IN FEET
BASIN Z
0.063 AC.
,_ / ~·.,,,....---_Q '/~ .. ,v
::::,,,., EXISTING 4" PVC
STORM DRAIN
L_FGENC:
--(36)--EXISTING CONTOUR
- - - -BASIN LIMITS
\"'~
I I
PERVIO US AREA
(2,559 S.F.)
IMPERVIOUS AREA
(5,648 S.F.)
STE CHARACTE~IST CS:
HYDROLOGIC SOIL GROUP ........... 8
APPROXIMATE DEPTH TO GROUND WATER ........... > 20 FEET
CRITICAL COURSE SEDIMENT YIELD AREAS ........... NONE
('.)
3:
0
x I..Ll a Sa COFFEY ENGINEERING, INC. ._ ______________________________________________________________________________________________________________________________________________________________________________________________ Ji
15-084
I
I
I
I
DRAINAGE MANAGEMENT AREA (DMA) EXHIBIT
PROPOSED CONDITIONS
/
0
0 /
\~
ASIN B < ,.
\\ \ \ W) 1111111 W'ii: ,I.WI" ~ v-' ---
,. -· --__./; . ~ ~ ___.-· . . ··\
\/ I
1 AC
I
k~·· ___ .-,,\ -. . . r ~-----=----/ .. >"" ,. \ l ~, ,,A'' . I
/ ---\ ·\ \ I I I
\ ASIN C \
1 0.063 AC \
f/jjr~-· \ . \
f /~/1/1 /I ,: \, ·' \ I_I, j ,)_ ,, \' I 0/i _\ ,.:.·\
OMA ID
BASIN
XX.XX
Sc~~
'----BIOFIL TRA TION AREA
PER BF-1
"" --
0~• I
10 ( /'::I \ . ' ,
2
,0 4,0
60
0/;;'."l': ': /. · _ . ~EXISTING 4" PVC ' V1:'.f( -, ·/ STORM DRAIN
SCALE IN FEET ~ // ,.-/'~
~~ ........
y ~.....-/
---~-~\Ol
LEGEND:
--(36)--EXISTING CONTOUR
----BASIN LIMITS
EXISTING STORM
DRAIN TO REMAIN
PVC DRAIN LINE &
LANDSCAPE DRAINS
~ BROOKS BOX
W/GRATE
Ce) PUMP
·-PERVIOUS AREA
(1,811 S. F.)
I I
IMPERVIOUS AREA
(6,396 S.F.)
t "' "' "' "' "'"' j BIOFILTRATION AREA
I• , , (172 S.F.)
STE CHARACTERISTICS:
HYDROLOGIC SOIL GROUP ........... B
APPROXIMATE DEPTH TO GROUND WATER ........... > 20 FEET
CRITICAL COURSE SEDIMENT YIELD AREAS ........... NONE
DMA ID BASIN AREA (AC.) DMA TYPE
BASIN A 0.013 SELF-MITIGATING
BASIN B 0.174 BIOFILTRATION
BASlN C 0.063 N/A
(_')
~ C)
N >< Lu a ~
... ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------.J ~ 15-084
is COFFEY ENGINEERING, INC .
- $ -
U• - A
- - - . .
. S
Ajpendix L Forms and Checklists
Harvest Feasibility Checklist i
1. Is there 'a demand for harvested iiater (check all that apply) at the project site that is reliably jreserit diiring,
the vetsan?
Toilet and urinal fluihing .. . .
1 Landscape irrigation -. . . .
El Other:
. •-- . . I
2: If there is a demand; estimate the antiipated average wet season demand over a periodof 36 hoirs. Guidance
for planning level derriand calculations for oilet'/urin.lfliishing and landscape irrigatidn is provided in Section'
B.3.2;
4resid6ntslday x 9.3 gallons/resident/day /7.48 gallons/cubic fot 'x 36 hours/
24hours/day=417.38 cubic feet' .. . ''.-
..
4 L ,
.3. Calculate the DCV using worksheet B.2-1. .
DCV = 268.41 (cubic feet) -
3a,Is the 36 hbur demand greater 3b. Is the 36hour demand greafei tha 3c. -Is the36 hour demand
thàn oi equal iothe DCV?: - 0.25DCV but less than the full DCV?, less than 0.25DCV?
Yes / UNo U Yes / El No U- Yes
Harvest and use appears to be - . Harvest and use may be feasible.- Harvest and use is
feasible. Conduct more detailed. Conduct more detiled evaluation and considered to be infeasible.
evaluation and sizing calculations' sizing ealculations to determine
to confirm that DCV can be used feasibility. Harvest and use may only be . .
at an adequate rate to meet. able to beusd for a portion tofthe site,
drawdown criteria or (optionally) the storage may need to be
upsied td meet long term capture targets
while draining in longer than 36 hours. . . . .
Is harvest and use feasible based on further evaluation I
U Yes, refer to Appendix E to select and size harvest and use BMPs
/ . • .
. 4 . . •" -
•. ] No, select alternate BMPs. . . . . . .- . , -
. a,
1 4 ,-.._.-.-. p ..-. .:,. . . - . 1 • - ,
a
U"
4 4 * . - - • . -: I• : . . . . - .- . 'I.., '4 . . 4. . . '. - -
.,
- - - . -: 1' . ,
-.
. •. .
-. . , . -. .4.! •
-. .-.- . ' - .! v
— • 4'_ : - -,.".- . . • •'l• - '. -- . 4 1-2 I February 2016
I
- 1--- • - _. . . .. . .- •
1 -_ ' .S - •ar :
CHR-ISTIAN WHEELER-
EN G IN EER-I N G
October 13, 2017
Mr. and Mrs. Behrooz Abdi CWE 2150264.08
5263 Shore Drive
Carlsbad, California 92008
Subject: Addendum to Infiltration Feasibility Study
Proposed Abdi Residence Addition, 5263 Shore Drive, Carlsbad, California
References: 1) Coffey Engineering, City of Carlsbad Priority Development Project Storm Water
Quality Management Plan, Abdi Residence, Project ID# CDP15-45, dated October 13,
2017.
Christian Wheeler Engineering, Infiltration Feasibility Study,; Proposed Abdi Residence
Addition, 5263 Shore Drive, Carlsbad, California, Report CWE 21502611.07, July 11, 2017.
Christian Wheeler Engineering,, Report of Preliminary Geotechnical Investigation,
Proposed Abdi Residence Addition, 5263 Shore Drive, Carlsbad, California, Report CWE
21502611.01, November 8, 2015.
Ladies and Gentlemen:
In accordance with the request of the project civil engineer, we have prepared this addendum to our
referenced Report of Preliminary Geotechnical Investigation and Infiltration Feasibility Study to
address the feasibility for storm water infiltration at the subject site. Unless specifically addressed or
amended herein, all of the findings, conclusions, and recommendations presented in the referenced
reports remain applicable to the subject project.
A revised "Worksheet C.4-1: Categorization of Infiltration Feasibility Condition" for the subject
project is included in Appendix A of this report. As presented on the last page (C-14) of the revised
Worksheet C.4-1, our feasibility screening for infiltration for the subject project indicates "No
Infiltration." Based on our review of the referenced Storm Water Quality Management Plan
3980 Home Avenue + San Diego, CA 92105 + 619-550-1700 + FAX 619-550-1701
CWE 2150264.08 October 13, 2017 Page 2
(SWQMP) prepared by Coffey Engineering, we understand that our revised Worksheet C.4-1 for the
I subject project has been incorporated into the project SWQMP.
I if you should have any questions regarding this report, please do not hesitate to contact this office.
This opportunity to be of professional service is sincerely apprciated.
Respectfully submitted, -
I CHRISTIAN WHEELER ENGINEERING
Vd( R~ /us s e 141,C.El /#2 2 15
'
I Da Z36O37
I
DRR:DBA, . .
ec: erica@coffeyengineering.com; rick@hkarchs.com; gary@hkarchs.com
OF
EERii
:
I -•' .
.- I ..
. Appendix C: Geotechnic1 and GrOundwater Investigation
I. •' . .. -. , - 4
' Revised Worksheet C:4i: Categorization of Infiltration Feasibility Condition
I.-
- -
1
-• . .- •
S •, . . • .--- . ,• - . -- ---- •' ' - •' * 1. 4 ' . -• * * - 4..-.. . . -.
- • * S , , - . - . * t S. - . -- *
- -• - •• - . . .-- ._,, --- ••_•• - * , - .,. -.
I - .:
- :
- -. - •: .. ' * . . -
4
,
-
. * :4 - *
' Storm Water Standards - S. • - -- - • .
• .• -
-.
* - . -
- Part 1: BIVIP Design - - •
3 ., . - -. . . * . * -
Manual C-12 '
4 -
-
Paft 1 Full Infiltration Feaibility Sening Criteria
Would iifilt.ationof tRe full dsin voluiñe b feasible frbm a physicalperspective without any
urdesifiBleconsegiiences1thãt ot.belteinoiaábl)r initigated? . i ,. . ..•
Criteria
1• - ' - ¶
Screenmg Question ..
-
EYes No --------------
- Is the estimated reliable infiltration rate-below proposed facility locations
greater than 0.5 inches per hour? The response to this Screening Question.xil .
shall be based on a comprehensive evaluation of the factors presenteçl in
* Appendix C.2 and Appendix D.
Provide basis:
I- - . 4 .• - * - -
Infiltration rate testing does not need to occur at this sensitive coastal bluff top site since, as presented in our
response to Criteria 2 below, infiltration of storm water and in-situ infiltration or percolation testing at the site -.
would adversely affect the stability of the coastal bluff along and adjacent to the shoreward side of the subject
site. . ,-..' ,• .' -
•; .. . - *3. _ - - • -: , • •1
._,.._ ••_• . - , - . -: . 4 . • - r • - - 1
- . . • - .4 . - . . -
.,: Can infiitratiór greater, t1.n 0.5 inches per hour be allowed without
' increasing risk- of geotechiiic.I hazards (slope stability, grouhdwater - : .
. mounding, utilities, or other factors) that cannot be mitigated to an
• - accptble level?. The response to this ScrEening Question shall be baked
comnihensive eVa1iitipn of th e factors nresetited in Anriiendix C.2.
C.2.2 Settlement and Volume Change: The on- and off-site old paralic deposits are subject to hydro-collapse as a
result of increased moisture content. (see Appendix B-2 of CWE 2150264.01)
C.2.3 Slope/Bluff Stability: Intentiohal infiltration of water las thepotential tgresult in an increased risk of slope/
bluff instability at the subject lot and along adjacent, bluff edge areas. As stated in the 2002 Guidelines for
Analyzing and Mitigating Landslide Hazards in California, "Changes in saturation of a soil may have some effect
on the cohesion component of the soil shèár strength by eliminating capillary tension or "apparent cohesion" in an
otherwise cohesionless s'oilór by the reduction of.the "dry strength" of a cohesive soil. Saturation also affects the
frictional shear strength because of the buoyant reduction of the nol-mal force component caused by the pore-water
presure". If full infiltrationwas allowed at the subject site, we anticipate that partial saturation of the soils
comprising the bluff would oêcur over tim! (see Appendix E of CWE 2150264.01)
- 4 •- I
' - - •. .
.
4 -
C.2.6 Retaining Walls and Foundations: Infiltration ofvater can result in potential increases in lateral pressures
and potential reduction in soil strength. Retaining walls and foundations can be negatively impacted by these
changes in soil conditions. We understand that basement retaining walls will Ie constructed as part of the proposed
development of the site. (see pages 217-22 of CWE 2150264.01).. •
It is our professional opinion that infiltration of greater than 0.5 inches pr hour cannot be allowed without
increasing risk of geologic hazards that cannot be mitigated to an acceptable risk.
*• 4
4.
. •' 4 4
a
.
to be completed using gathered site information and best professional judgment considering the definition of '
MEP in the MS4 Permit Additional testing arid/or studies may be required by City Engineer to substantiate
findings 1
a
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Manual C-12 * ' + '. * •
, C-12 •, '"p. - - -. - ':•- * * ,
I 4
Criteria Screening, Q- .. - Yes No
Can infiltration greater than 0.5 inches jer hour be allowed 'crithout,
increasing risk of grouiidwateréontainination.(shallow water table, storm
water jollutants or 'other factors)that cannot be mitigated to an accekable
level? The response to this,Sci-eening Question shall be based on a
comnrehensive evaluation hf the factors oreserted in Annendik C.3. -
Provide.basis: 4. . '- , . " •. *
-. p p.
The risk of groundwater contamination
h:s
riot been evaluated at this time
; C infiltration greater,' than 0.5 inches per hour be allowed with'out
causing potential water balance'issues such as change of seasonality of
4 ' ephemeral streams or increased discharge of contaminated groundwater to x
surface waters? The respoiise to this Screening Que'stion shall be based on
a comorehensive evaluaticn of the factors nresentd in Annendix C.3.
Provide basis
The risk of causing potential water balance isues *such as change of seasonality of ephemeral stieams or increased discharge of contaminated groundwater to surface waters has not been evaluated at this
time However, there are nobodies of water betweenthe subject site and the Pacific Ocean.
1 1 4 4 4 t
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" If all answers to row 1 - 4 are "Yes" full infiltration design is potentially feasible.
The feasibility screening category is Full Infiltration '.
Part
Resiilt*
, ' '
If any answer from row-14 is "No", infiltration may be possible to some
See
extent but would not generally be feasible or desiiable to achieve a "full
infiltration" design. Pioceed to Part 2 4" ' +
U 4
4 Appendix C: Géotechhicàl'and Groundwater Investigation
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Part 1: BMP Design -.
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I Manual C14
C.4-1 Page 3 of
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Worksheet
. Part 2 - Partial Infiltration vs4 No Infiltration Feasibility Screening Criteria
Wouldmfiltration of water, in any appreciable amount be physica1ly fasib1e without any
t negative conseguelices that cannt be reasonably mitigated,,
Criteri Screening Question *
................................................................... Yes No
Do soil and geologic conditions allow for infiltration in any appreciable •
rate or volume? The response to this Screening'Question shall be based
on a comprehensive evaluation of the factors presented in Appendix C.2
and Appendix D.
Provide basis:
Infiltration rate te'sting does not nee'd to occur at this sensitive coastal bluff top site since as presented in our
response to Criteria 6 below, infiltration of stbrm water and in-situ infiltration or percolation testing at the site.
.would adversely affect the stability of the coastal bluff along and adjacent to the shoreward side of the subject.
,site. .. •
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Can Infiltration iii any appreciable'quantity be allowed without
. increasing risk'of geoteéhnical hazards (slope stability, groundwater .
6 . mounding, utilities, or 'other factors) that cannot be mitigated to an%
.
acceptable level? The reponse to this Screening Question hall Ee based
• on a comprehensive eraluation of the factors presenteä in Appendix C.2."
C.2.2 Settlement and Volume Change: The on- and off-site old paralic deposits are subject to hydro-collapse as
i-esult of increased moisture content. (see Apjendix B-2 of CWE 2150264.01) ." .
C.2.3 Slope/Bluff Stab ility:'Intentional infiltration of.water has the potential to result in an increased risk of shSpe/
bluff instability at the subject lot and along adjacent, bluff edge areas. As stated in the 2002 Guidelines for
Analyzing and Mitigating LandslideHazards in California, "Changes in saturation of a soil may have some effect
on the cohesion component of the soil shear strength by eliminating capillary tension or "apparent cohesion", in an
otherwise cohesionless soil or by the reduction of the "dry strength" of a cohesive soil. Saturation also affects the
frictional shear strength because of the buoyant reduction of the normal force component caused by the pore-water
pressure".-If full infiltration was alldwed at the subject site, we anticipate that partial saturation of the soils
comprising the bluff would occur over.tirñe. (see Appendix E of CWE 2150264.01)
C.2.6 Retaining Walls and Foundations: Infiltration of water can result in potential increases in lateral pessures
and potential reduction in soil strength. Retaining walls and foundations can be negatively impacted by these
changes in soil conditions. We understand that basement retaining walls will be constructed as part'of the proposed
development of the site. (see pages 21-22 of CWE 2150264.01)
It is our professional opinion that infiltration of greater than 0.5 inches per h4our caimdt be allowed without
increasing risk of geologic hazards that cannot be mitigated to an acceptable risk.
.4. .-. • . .
4 '
4
I 4 *
" . . Appendix C:'Geotechnical and Groundwater Investigation
I
IV
Z Appendix C:,Geotechnical. and Ground*ater Investigation \ .
:
*
Worksheet C.4-1 Page 4 of
Criteria in Ohl' Yes No
- Can Infiltration in any appreciable quantity be allowed without' posing
- significant risk for groundwater related concerns (shallow water table;
' 7 storm water pollutants or'other factors)? The response to this Screening
Question shall be based on a comprehensive evaluation of the factors * • presented in Appendix C.3. . .
Provide basis:
. t S 4.
4*
The risk of groundwater contamination has not been evaluated at this time. . .
4
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Can infiltration be allowed ivithout violating downstream water . -.
8 rights? The response to this,Screening Question shall be based' on a
* comprehensive. evaluation of the factors presented in Appendix C.3. ..
'
.
4
Provide basis •
- . -
.
. 'V
,
4 ,
.4. - ,
. The risk of c1ausing potential water balance issues such as change of seasonality of ephemeral streams or,•
increased discharge of contaminated groundwater td surface waters has not been evaluated at this time. a
However, there are no bodies of water between the subject- site and the Pacific Ocean. :.
4' • • . . .. ,
4 1 4 . 5 4' S
:' •.. .
If all answers from row 1-4 are yes .±hen partial infiltation 'design is potentially ,
Part 2' feasible. The feasibility screening category is Partial Infiltration.. ' ' , --'. ' NO Result If any answer from row 5-8 is no, then infiltration of any volume is considered to'. Infiltration
be infeasible within the drainage area. The fasibility screening category is No
Infiltration.
- 4 .
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Storm Water Standards.
Part 1: BMP Design
I I V' Manual-' -
84 ,
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- - - - - . - - - ii•ui 'Appendix E:BMP Design Fact Sheets -
1 .2 -'i .4
Potential Sources of Permanent Controls Showon Permanent Controls—List in Table Operaional BMPs—Include in
Runoff Pollutants - -' Drawings - and Narrative Table and Narrative
€i A Onsite storm drain I Locations of inlets Mark all inlets with the words "No ' Maintain and periodically repaint
inlets
- .
Dumping! Flows to Bay" or similar. or replace inlet markings.
Provide storm water pollution
D Not Applicable prevention information to new
- -
-
*
site owners, lessees, or operators
i4 See applicable operational BMPs
• - ••. - in Fact Sheet SC-44, ccDrajflage
- - System Maintenance," in the
CASQA Stormwater Quality
* -• - Handbooks".at
• - - www.cabmphandbooks.com.
1;- - . - r • - 1 •
-
- - - .• -. --•
-
-
Include the following in lease
agreements "Tenant shall not
• -• -' - - allow anyone to discharge
- anything to storm drains or to
- . store or deposit materials so as to
- create a potential discharge to
storm drains." -
1 - • - - - - -- - -. I -. C •-, -
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- E-3 February 2016
- •iuii 1; - - - :
Appendix E BMP Design Fact Sheets
- .--- '- -
-
2
Potential Sources of Permanent Controls—Show on Permanent Controls—List in Table Operational BMPs—Include in
Runoff Pollutants Drawings and Narrative Table and Narrative
U B Interior floor drains U State that iiterior floordrains and U Inspect and maintain drains to
and 'elevator shaft . elevator shaft sump pums will be - prevent blockages and overflow.
sump pumps plumbed to sanitary sewer.
Not Applicable
U C Interior parking - - U State that parking garage floor U Inspect "an maintain drains to
garages, - - drains will b plumbed to the prevent blockages an overflow
t Not Applicable '- sanitary sewer or an approved BMP
O Dl Need for future - U Note building design features that U Provide Integrated Pest
indoor & structural disourage entry b'f pests Management information-.- to
pest control owners, lessees, and operators
NApphc:bk
H.
-,
.-
E-4 - r February 2016
-
—.----...—. - :•:'.
-
* • Appendix E BMP Design Fact Sheets
2 - -- - :- Potential Sources of Permanent Controls—Show. on Permanent Controls—List in Table Operational BMPs—Include in
Runoff Pollutants - - .- Diawings and Narrative Table and Narrative
1 D2 Landscape/ i4' Show 1oations of existing State thai final landscape plans will I( Maintain landscaping using
Outdoor- -Peticide
- trees or areas of shrubs and . accomplish all of the following. . minimum or no pesticides.
L1 ground cover
-
to be id Presefve existing drought tolerant trees ' See applicable operational Not Applicable
-
-- undisturbed and retained. - -shrubs, -and ground cover to the BMPs in Fact Sheet SC-41,
* - Show self-retaining landscape maximum extent possible - "Building and - Grounds
-
areas, if any.
f 1 Design.*- landscaping to minimize in theCASQA
Show storm water treatment Show',
facilities. irrigation and runoff, to promote Stormwater Quality Handbooks
- surface 1ntrauon where appropriate, at vi cabmphandbooks coin
and to minimize the use of fertilizers I' Provide IPM information to
and pesticides that can contribute to new owners, lessees an
.. storm water pollution operators
Where landscaped areas are used to
, retain of detain storm water, specify -
plants that are tolerant of periodic
- saturated soil conditions
Consider using pest-resistant plants,
- especially adjacent to hardscape -
To ensure successful establishment,
select plants appropriate to site soils,
slopes, climate, sun, wind, rain, land
. -. - -- - use, air movement, ecological
*
-
consistency, and plant interactions
* -: - ,- 7'- -' -- -. :- -.• - :. - * __: . -- . .. - -t . -
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E-5 February 2016
- - - - :- :- - - —,. --.— - - - —. _;• - C • - •. __ l•• -
- - Appendn E BMP Design Fact She -
- - - -.-- - -- - -. - -
- -
1 -- 2- - 3
'Potential Sources of -' Permanent C(;ntrols—Showon Permanent Controls—List in Table Operational BMPs—Include
Runoff Pollutants Drawings. - and Narrative - in
________________________ - • Table and Narrative
D E Pools, spas, ponds, CD Show location of water feature'Cl Pool backwash to be plumbed to the U See applicable operational
decorative fountains, and a sanitary sewer cleanout in sanitary sewer. Place a note on the BMPs in Fact Sheet SC-72,
and other water an accessible areawithin 10 feet plans and state in the narrative that "Fountain and Pool
features -this- c5nnection will be made Maintenance," in the CASQA
Not Applicable according to city requirements * Stormwater Quality
-
, Handbooks at
- - C www cabmphandbooks com
- - -r - - --. - -- -•- - ' -: - - • -
O F Foodervice 0 For restaurants, 'grocery stores, U Describe ihe location and features of
Not Applicable and other food service the designated cleaning area
-
-
. operations, show location El (naoors or. in a cedaréa -
Describe the items to be cleaned in -
- this facility and how it has been. sized outdoors) of a floor sink r other to ensure that the largest items can be * - area for clemiTg floor mats, accomniodated - containers, and equipment - 4 -
0 On the drawing, show a note that p
-
- this drain illbe cormected to a - - -
grease interceptor before C
discharging to the sanitary sewer -
-
-- • -. - * • -• -- - - -- :
- * • p - --. - - - •:- - •-- -
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-. - - - -,-.- - .• j--.- : -
February, 2016
, - I
-- *- - - -
-
- - - 4
Appendix E BMP Design Fact Sheets
_________ - -
F 1 2 *
Potential Sources of Permanent Controls—Shw on Permanent Contiols—List in Table Operational BMPs—Inc1iide in
.. Runoff Pollutants Drawings and-Narrative Table and Narrative -:
G. Refuse areas D Sh'bij where site refuse and D State how. site ,refuse will be 0 Sate how the following wiJlbe
Not Aplicab1e recycled -material's will be handled and provide supp'o'rting * implemented: -
handled and stored for pickup. detailto what is shown on plans. Provide adequate number of
0 If dumpsters or other receptacles 0 State that signs will be posted on receptacles Inspect receptacles
are outdoors, show how the or near dumpsters with the words regularly, repair or replace leaky
- designated area will be covered, "Do not dump hazardous receptacles Keep receptacles
graded, and paved to prevent materials here" or similar. covered Prohibit/prevent
run- on and show locations of dumping of liquid or hazardous
- berms .toprevent runoff froxñ -- - . wastes. Post "no hazaidous-
the area Also show how the materials" signs Inspect and pick
designated area will be protected up litter daily and clean up spills
from wind dispersal "immediately. Keep spill control
Any drains from dumpsters . . materials ,ayai1ab1e on- site.See
- - - compactors, and tallow bin areas - - . - - Fct Sheet SC34, 'Waste
- - - - -: - shall be dischaige t0 an ' - - Handling and Disposal"- in the
approved BMP CASQA Stormwater. Quality.
- .- -
0 Refer to City Standard Drawing
- - - - Handbooks - at.
www.cabrnphandbooks.com. GS-16 for details -
-
February 2016
V
VFebriary2016 -
I
Vt
'V r
V V . - VI V •V V V VV.- - -.V V - - V
- - Appendix E BMP Design Fact Sheets
Mob
1 2 4
Potential Sources of Permanent Cntrols—Show on Permanent Controls—List in Table and Operational BMPs—Include
- -Runoff Pollutants Drawings . V .Narrtive . - in Table and Narrative'
Table and Narrative * •V V •V V V
0 H Industrial 0 Show process area - process 0 If industrial processes are to be located 0 See Fact Sheet SC-b, "Non-
processes. V
V onsite, state: "All procss activities to be Stormwater Discharges" in the V
.16 Not Applicable
V V
. performed indoors No processes to CASQA Stormwater Quality
drain to exterior or to storm drain Handbooks at
system.,?
- .' - vw.cabuiphandbooks.com.
0 1. Outdoor storage of 0 Show any- outdoor storage 0 Include a detailed deripdon Thf 0- See the Fact Shets SC-31,
equipmentr or areas, inducing how materials materials to be stored, storage areas, and "Outdoor Liquid Container
- matdrils. (See rows J wffl be covered. Show how struCtual features to prevent pollutants V Stoage" and SC-33, "Outdoor
and K for source areas will be graded and from entering storm drains - - Storage of RawMaterials" in
control measures for bermed to prevent run-on or.
V 'Where appropriate reference the,*CASQA Stormwater
:.'vehicle V cleaning, . runoff from area and protected documentation of compliance with the -Quality ',, Handbooks at
repair, and from wind dispersal requirements of local Hazardous www cabrnphandbooks corn
maintenance) Li Storage of non-hazardous Materials Programs for f Not Kppliab1e " -. -' liquids shall be covered by i Hazardous Waste VGeneratlon. - roof and/or drain to the -
V
• sanitary sewer system, and be Hazardous Materials Release
'C' ontairijI by berms, dikes, _Response and Inventory
- liners, or vaults California Accidental Release
- 0 Storage of hazardois niaterials Prevention Program -
and wastes rnust be in . Aboveground Storage Tank
compliance with the city's
hazardous materials orthnnce
- Uniform Fire Code Article 80
-
and a Hazardous Materials . -
- Section 103(b)'&-(c) 1991
-
Management Plan for the site Underground Storage Tank
-
-
- - - - - - - - - - - - - - - - - - - -
- -. . -
V • - •;"'. . V. - • • V I. - - -. V * - • .•.• *••V. ,
Appendix E BMP Design Fact Sheets
-4 'V 2
Potential Sources of Permanent Controls—Show on Drawings Permanent Controls—List in Operational BMPs—Include in
Runoff Pollutants V
V , - Table and Na riative' Table and Narrative
LI J' Vehicle and LI Show on drawings as appropriate LI If a car wash area is not Describe operational measures to
Equipment Cleaning ' ' V V V V V ' V (1') Commercial/industrial facilities having provided, describe, measures
V V
implement the, V following (if
V Not Applicable - V ' V V 'V vehicle /equipment cleaning needs shall either taken to discourage onsite
V V V .. V
.applicable): V V , V •
V , V
•
V provide a covered, bermed area for washing - car washing and explain how'. V V -
- V
V V V V,
V
V V' V V V . V activities or discourage -vehicle/ vehicle/equipment these will be enforced. . .
'
• Washwater from vehicle -and
V•
'V. • '-V. V - washing-by removing hose bibs and insta1lii9
V
' : . .' V -
equipment washing.operations
signs prohibiting such uses shall not be discharged to the
- ,
• V
. • -
V
• ' V V V V (2) Commercial car wash facilities shall be storm drain system. ..-
- designed such that no runoff from'the facility - LI Car dealerships "and similar
V V V V is discharged to the'storm drain system.' -
V '
' V •
-
may rinse cars with water. only. '
V -
Wastewater from the facility shall discharge to LI See Fact Sheet SC-21,"Vehicle
the sanitary sewer, or a wastewater reclamation - and Equipment Cleaning," in
system shall be installed ' the CASQA Stormwater
Quality. Handbooks, at
www cabmphandbooks corn
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Appendix E BMP Design Fact Sheets
- 2
Potential Sources of Permanent Controls—Show on Permanent Controls—List in Operational BMPs—Include in
,Runoff Pollutants Drawings -, Table and Narrative Table and Narrative
0 K Q. Accommodate all vehicle 0 State that no vehicle repair or In the report, note that all of the following
Vehicle/Equipment - equipment repair and maintenance will be done restrictions apply to use the site
Repair. I and maintenance indoors or designate outdoors, or else describe the 0 No person shall dispose of, nor permit Maintenance 'design. . an outdoor work area and
- required features of the the. disposal, directly or indirectly of
Not Applicable -
the area to protect from rainfall, outdoor work area 4vehic1e fluids, hazardous materials, or
- - run-on runoff, and wind dispersal 0 State that there are no floor,rinsewater from parts cleaning into
01 Show seondary cohtihmnt for drains dr if ther .aie floor storm drains.
exterior work areas where motor drains, note the city from 0 No vehicle fluid removal shall be oil, brake I fluid, gasoline, diesel 1vl?icI. an industrial waste perforrnd outside a buildig, nor, on fuel, radiator fluid, acid- discharge permit will be asphalt or ground surfaces, whether containing .batteries or other obtained' and that the design inside or outside a building, except iii
- hzardous materials or hazardous meets city's requirements.such a manner as to ensure that any, wastes are used or stored.'Drains 0 State that there are no tanks, spilled fluid will be in an area of
4 shall not be installed withI.in the
- secondary containment areas -
containers or sinks to be used secondary, - containment Leaking
for parts cleaning or rinsing vehicle fluids shall be contained or
0 Add a note on the plans that states or, if there are, note the city drained from the vehicle immediatel
: . . either (1) there are no floor drains, r from which an industrial U No person shall leave unattended drip
•
or (2) floor drains are connected waste discharge permit will be parts or other open containers to wastewater pretre'atment obtained and that the design containing vehicle fluid, unless suh systems prior to .discharge to the ' meets city's requirements. containers are in use or in an area of -sanitary sewer and an industrial secondary containment waste discharge permit -will be
'obtained.- -
- - E-10 ' - February 2016
I.
- .; .'•,• - - - . 4 -- - • - - :_ . •_t ._.. - - -.4 .- .c - -'• .•• -. --. .. . .-.-.-. -, -
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— — — .- — — — — —. — — -- — — — — —
¶ -. S S. - - I
LAppendi.x E BMP Design Fact Sheets
2 '3 4
Potential Sources of Permanent Controls—Show on Permanent Controls—List in Operational BM Ps—Include in
. Runoff Pollutants . .. * Drawing • • VV• : Table and Narrative V -Table and Nárratiize o L Fuel Dispensing 0 Fueling areas shall have ..
--
• 0 The property owner shall dry sweep
Areas impermeable' floors (i.e., Portland' the fueling area routinely.
Not Applicable cement concrete or equivalent .. r 0 See the Business Guide Sh-eet, smooth impervious surface) that ccAutomouve Serrice—Srvice * are (1) graded at the minimum — Stations' in the .CASQA Stormwater slope necessary to prevent
- .- - Quality Handbooks at - pondmg, and (2) separated from -
- www cabmphandbooks corn
- the rest of the site by a grade break
- . %,that prevents run-on of storm -
.. . V• - •. V•V*
water to the MEP V V ....4.
-
-- - .
• . . -
-0 Fueling areas shall be covered by a
• - V
-
4 canopy that extends a minimum of -
ten feet in each direction from each * -
- purip [Alternative The fueling * • .
- - area must be covered and the
-
cover's minimum dimensions must
be equal to or greater than the area -. -
-
within The grade break or fuel
- dispensing area'] The canopy, [or . -
- V
V - hover] shall not -drain- onto the
V V
* fueling area.
. - ..
1. The fueling area shall be defined as the area extending a minimum of 6.'5 feet from the corner of each fuel dispenser or the length at wch the hose
and nozzle assembly may be operated plus a minimum of one foot, which:veris greater.
- A E-11 • - February 2016
V - V - V -
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-
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- - - - - - - - - - - - - - - - - - - 41
t - -
Appendix E BMP Desigic Fact Shets r
- 2
Potential Sources of -Permanent Controls—Show on Permanent Controls—List it Operational BMPs—Include m
Runoff Pollutants Drawings Table and Narrative Table and Narrative
M Loading Docks LI Show a preliminary, design for the LI Move loaded and unloaded items
Not Applicable loading dock area, including mdocrs as soon as possible
roofing and drainage. Loading El See Fact Sheet SC-30, "Outdoor• docks shall be covered: nd/or - Loading and Unloading,' in - the
-. graded td-minimize run-on to and CASQA Stormwater Quality
- runoff from the loading area Roof Handbooks * at r downspouts shall be positioned to - iww cabmphandbooks corn
- - direct storm water away from the
loading area Water from loading
dock areas should bediained to an -
approved BMP ' -Direct
connections to storm drains from
- depressed loading docks are -
,•
'. prohibited.,:..'
.'• ;•:-- ••• - -
-
- - - -
CJ Loading 1.dock shall be equipped
- •--• - -. - - - -
W1 th a spill control valve or - -
equivalent device, which shall Ie
kept closed during periods of -
operation -
- LI Provide a roof overhang over the -
* loading area or install door skirts - * '(cowling) at each bay that enclose
the end the trailer of •
-.• -- r
•
* -.
. •
- - .•
,- --: •
.•---
.•_ - - •• -- -- - - -
- -
- --.- E-12 - February 2016
"- -* • - .--• - - -. .- -
: . — •
•— — — — — —•
/ Appendix E BMP Design Fact SIiets
2 4
-- Potentia1 Sources of Permanent Controls— Permanent Controls—List in Table and : OperationarBMPs—Include in
Runoff Pollutants -. Show on Draings Narrative Table and Narrative
U N Fire Sprinkler U Provide a means to drain fire sprinkler. test U See the note in Fact Sheet SC-
Test Water to the sanitary sewer or approved BMP 41, "Building and Grounds
Not Applicable Maintenance," in the CASQA
-. Stormwater Quality
Handbooks at
r.cabmphandbooks.com: o Miscellaneous Drain or U] Boiler drain lines shall be directly or indirectly
Wash Water - - connected to the sanitary sewer system and may
U-. Boiler drain lines not discharge to the storm drain system.",,- -
El Condensate drain 0 Condensate drain lines may discharge to
lines landscaped areas if the flow is small enough that
O Rooftop runoff will not occur. Condensate drain lines may
not discharge to the storm drain system
- equipment *
0 Drainage sumps -
- Roofing, gutters, -
0 Rooftop mounted equipment with potential to
id
produce pollutants shall be roofed and/or have
- secondary containment and trim - -
0 Any drainage sumps onsite shall feature a - - -. - - - 0 Not Applicable sediment sump to reduce the quantity of sediment
in pumped water.
-
*
- Avoid roofing, gutters, and trim madc of copper
or other unprotected metals that may leach into
- runoff
-
- --.5 . .4 t•t _.-' .4
t * S. :S - . - ..4 - -4-- - .5 - - -: - - 0 - - -- 4 '. 4 -- -
P.-
-
4 . P -- •. - - .4-.' -.
4- . 5- .
-- ___5 - - 4- •4 . - .4' - - 4 -
- •
- E-13
-
-
February 2016
- - - - t - - - - ---ft - - - - - - - - - - 4
4 a - 4 •VV. ., 'V
* .
- 4 Appendix E BMP Design Fact Sheets
2 4
Potential Sources of Permanent Controls- Show on Permanent Controls—List in Operational BMPs—Include in
Rui-ioffPollfitants Drawings - Table and Narrative Table" and Narrative..
D P. Plazas, idewk, Plazas, sidewa1k, and parking lots shall
and parking lots - be swept regularly to prevent the
0 Not Applicable accumulation of litter and debris
Debris from pressure washing shall be
- collected to prevent entry into the storm
- - . drain system Washwater containing any
- -
4 cleaning agent or degreaser shall be
-
-
collected and discharged to the sanitary,
seirer and ndt discharged to a storm
-. -
- - . - . - V •
-
- . - ;V -
drain: *
- .
- 4 V.- - ------ -'V - - V V%Vf - ft V - - (VV V •V • -V -
a I . -
- - .. - - - V - -'- - . . - ft ,7. •_
- 'V - 1- - V VV ', I S _•. V . ft
V- •V - - . •V . I 4 V_* V -
--V
' ft * - -
. - .5
.
. . - -
- - -- fl I - - - -
a - -
•
-. 'a f
*
-. V - - - 'I- • .. - - V - , - V ,_ - -
- 5- - V V4 - V VV . I. 1 • V V ••. .' -
S
• I - - -
- - I_ - - --; ft — - - •-' V *V . - V I -- •. - - - - * V
- _ 'V '*IV - -- V V# - __ -
V
I — -I_,-
- _,
V • SV . ft V•4 V. V , V...V V -- - -ft. -.
- - - E-14 — - - - February 2016
-ft
I
Storm Water Standards
SITE LOCATION
85P = 0.57
San Diego County
85 th Percentile lsopluvials
Legend
--85th PERCENTILE ISOPLlMAl
LJ INCORPORATED CITY
NOTE:
The 85th percentl!e is e 24 hOur rainfall total.
It represetns a vak.Je such that 85% of the
observed 24 hour rainfall totals will be less
than that vatue
N + ~-· 0 t 2 4 0 8
'H~IIIN'A:,l,.."A 'f~"'ltO.'t\'la.l!M.t.J>rl'O""AAfl'...-0 ~'l'..ta,t ~OR~HQ.1.cw:J9JYf«)fUllfl(DtO.t-;£~ ~<ml'tC#~..-.m,.uc1<""1ofMJ()ltll~tcu,_'°" ~-'<oc_...,._, __ ._.,..,, .... ,;oo.g ~-s.----.. _...,._.~ ....... -po-fll3,0IC)IIOI~------~--~..,~-&owe~ .. ~ :.-• ~i>l'R _ _...,,~ ~-~C_.,CIO"_ ...... ..,.,.,.....,_.,.,,._ __ ,,.. __ .,. __ ---~-... .. ~ ~~IS~ MIIIQla-r..-.:Clro.llOII-W'M -----~-...o-.~-
(1!11'14"."C., "''._~~~.t•.fl'C1•_ ... _.c_.;,;,--.
f'CI.D_C19F"'.Af~ •
Part 1: BMP Design Manual
January 201 6 E dition
W EG
=--GIS ~=~
Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods
. )
---c!.
Figure B.1-1: 85th Percentile 24-hour Isopluvial Map
B-7
-
(~~I
City of San Diego
~
TRANSPORTATION & STORM WATER
-
-- RunoffFacoIAreafft
Concrete or Asphalt or Roof 0.9 :6,084
Amended, Mukhèd Soils or Landscape 0.14 1,552
Weighted Runoff Coefficient ,. . '. 0.746
It
-
'a
1*
-
4-
-
1 85th Percentile 24 hr storm depth from Figure b.1-1 d = Q157 inches
2 Area tributary to BMP (s) A = 0474 acres
Area weighted runoff factor (estimate using Appendix
B.-1.1 and B.2:1 C - 0746 L
unitless
-
4 Street trees volume reduction TCV =' 0 cubic-fèet
5 Rain barrels volume reduction RCV = 0 cubic-feet
6 Calculated DCV.= (3630 x C dxA) - TCV - RCV DCV = - . . 268.41 cubic-feet
1 Remaining DCV after implementing retention BMPs 268.411 I cubic-feet
2 Infiltration from Worksheet D.5-1 if partial infiltration is feasible 0 in / hr
3 Allowable drawdown time for aggregate storage below underdrain 36 hours ••.
4 Depth of runoff that can be infiltrated [Line 2 x Line 3] 0 inches
S Aggregate pore space 0.4. in / in
6 Required depth of gravel below the underdrain [Line 4/ Line S] , 0 inches
7 Assumed surface area of the biofiltration BMP . i172,.12 sq-ft
8 Media retailied pore space 0.1 in /,in
9 Volume retained by BMP [[Line 4 + (Line 12 x Line 8)1/12] x Line 7 34.424 cubic-feet
10 DCV that requires biofiltration [Line 1 - Line 9] . 233.98 cubic-feet
______
11 Surface Ponding [6 inches minimum, 12 inches maximum] . 9 1 inches
12 Media Thickness [18 inches minimum] 24, inches
13
-
Aggregate Storage above underdrain invert (12 inches typical) - use 0 inches
for sizing if the aggegate is not over the entire bottom surface area 0 inches
14 Media available pore space 0.2 in /in
15 Media filtration rate to be used for sizing 5 in / hr
BasIunCaluIätiôns"
16, Allowable Routing Time for sizing ' , 1 6 hours
17 Depth filtered during storm [Line 15 x Line 16] 30 inches
18 Depth of Detention Storage [Line 11+ (Line 12 * Line 14) + (Line 13 x Line 5)] . 13.80 inches
19 Total Depth Treated [Line 17 + Line 18] * 43.8 inches
Opt6-i1-BiófiItr15tiiiejthe'DCV '
20 Required biofiltered volume [1.5 x Line 10] 350.98 cubic-feet
21 Required Footprint [Line 20 / Line 19] x 12 ' , 96.16 sq-ft
Option 2 :StoFe 0 75 of the ri'mining DCV in poFeàifd idndurig " r
-
1
22 Required Storage (surface + pores) Volume [0.75 x Line 10] 175.49 cubic-feet
23 Required Footprint [Line 22 / Line 18] x 12 152.60 sq-ft
F56tprintftheBMP
24 Area draining to the BMP , 7580; sq-ft
.25 Adjusted -Runoff Factor for drainage area (Refer to Appendix B.1-and B.2) 0.745532 -
26
-
BMP Footprint Sizing Factor (Default 0.03 or an alternative minimum
footprint sizing factor from Worksheet B.5-2, Line 11) 1
03
27 Minimum BMP Footprint [Line 24 x Line 25 x Line 26] 169.53 sq-ft
28 Footprint of the BMP = Maximum(Minimum(Line 21,Line 23), Line 26) 169.53 sq-ft
Footprint of theBMP - NOT APPLICABLE , - •,, - - -_
29 Calculate the fration of DCV retained in the BMP [Line 9/Line 1] - - N/A 'unitless
30 Minimum required fraction of DCV retained for patial infiltration condition 0.375 unitless
31 Is the retained DCV 0.375? If the answer is no increase the footprint sizing
factor in line 26 until the answer is yes for this criterion
Yes No
— Note: Line 7-is used to estimate the amount of volume retained by the BMP. Update assumed surface area
in line 7 until its equivalent to the required biofiltration footprint (either Line 21 or Line 23) ,
I
'
ATTACHMENT 2
BACKUP FOR PDP HYDROMODIFICATION CONTROL MEASURES
[This is the cover sheet for Attachment 2.]
Indicate which Items are Included behind this cover sheet:
Attachment. Cóñtents Checklist
Sequence
Attachment 2a Hydromodificetion Management
Exhibit (Floquirod)
16'Included
See Hydromodification Management
Hydromodification EXEMPT Exhibit ' Exhibit Checklist on the back of this
Attachment cover sheet.
Attachment 2b Management of Critical Coarse 16Exhibit showing project drainage
Sediment Yield Areas (WMAA Exhibit boundaries marked on WMAA
is required, additional analyses Care Critical Coarse Sediment Yield
optional) . Area Map (Required)
,See Section 6.2 of the BMP. Design, Optional analyses for Critical Coarse
Manual. . Sediment Yield Area Determination
U 6.2.1 Verification of Geomorphic
Landscape Units Onsite
U 6.2.2 Downstream Systems
Sensitivity to Coarse Sediment
U 6.2.3 Optional Additional Analysis
of Potential Critical Coarse
- . Sediment Yield Areas Qnsite
Attachment 2c Geomorphic Assessment of Receiving '! Not performed
Channels (Optional)
,
U Included
See Section 6.3.4 of the BMP Design . - N/A Manual. •
Attachment 2d Flow Control Facility Design and U Included
Structural BMP Drawdown
Calculations (Required) ... .. •
,
See Chapter 6 and Appendix G of the N/A
BMP Design Manual' . -
I
I
I
I
,,t
I
Use this checklist to ensure the required information has been included on the
I
Hydromodification Management Exhibit:
The Hydromodification Management Exhibit must identify:
I 1'Underlying hydrologic soil group
(Approximate depth to groundwater
"Existing natural hydrologic features (watercourses, seeps, springs, wetlands)
I .:'Critical coarse sediment yield areas to be protected, (if present)
fExisting topography
fExisting and proposed site drainage, network and connections to drainage offsite
I oPropoaed grading
'Proposed impervious features
D Proposed design features and surface treatments used to minimize imperviousness
I D Point(s) of Compliance (POC) for Hydromodification Management
El Existing and proposed drainage boundary end drainage area to each P00 (when necessary,
create separate exhibits for pro development and post-project conditions)
I 'Structural BMPs for hydromodificotion management (identify location, type of BMP, and
size/detail)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
; , ' ' , ; i.. .. _ I ' -.,,,,, ,....,...:,.,.,,i, ,..,_.-"i'-o,us:,; """--' ··~""'' ......... -1 ........ ,....------""'-· I I
='t J --\~~/~ / <, l
~
s.' CAf!_ ~-~
<o , +~
PROPOSED SINGLE
FAMI LY RESIDENCE
("9)-----~
0 10 20 40 60
I I I I I
SCALE IN FEET
Sa COFFEY ENGINEERING, INC.
\
\. . y·-:r.· ;r: ·+-)\·111
• (1·?~) J .. , .. )\3 ... '· ~,· /-?\
IOFIL TRA TION AREA
(BF-1 )-NO INFILTRATION
AREA=172 SF
XISTING 4"STORM DRAIN
".
UNITE BLUFF
HYDRO MOD EXE MP T EXHIB IT
P ROP OS ED CONDITIONS
(SHEET 1 OF 2)
LEGEND·
-(36)-
-
~
G
I l
t~~~~~~l
PROPERTY LINE
EXISTING CONTOUR
HARDENED CONVEYANCE
SYSTEM
DIRECTION OF FLOW
EXISTING STORM
DRAIN TO REMAIN
PVC DRAIN LINE &
LANDSCAPE DRAINS
12x12 BROOKS BOX
W/GRATE
PUMP
IMPERVIOUS AREA
(6,396 S.F.)
BIOFILTRATION AREA
(172 S. F.)
s T[ CHA~P..CTF~IS ncs:
HYDROLOGIC SOIL GROUP ........... B
APPROXIMATE DEPTH TO GROUND WATER ........... > 20 FEET
CRITICAL COURSE SEDIMENT YIELD AREAS ........... NONE
15-084
HYDROMOD EXEMPT EXHIBIT
-
PROPOSED CONDITIONS
- (SHEET 2 OF2)
f1.
(PER PLAN)
CLEANOUT
W/ CAP 6' PVC
INLET DROUGHT TOLERA 39.40' _36 NNT PROPOSED
DE
•Th-
FINISH
38.90'
1 .
rFREEBOARD LANDSCAPE PLA 38.9' -
37.65: CURB WALL
36.90
D II
12 x12 BROOKS BOX
PONDING H \OVERFLOW CONTROL ,)
3540 - -
- RIM 3765' I I 1. E. 3390 18" ENGINEERED
SOIL MEDIA* ___________ ______ ** FILTER COURSE I
° IMPERMEABLE LINE
*
NER
RETAINING INIUJJI I 1. E. 33.90
WALL ----j- I \ \. 6 PERFORATED PVC PIPE
IEEI - L \ 111 1 UNDERDRAIN, HOLES DOWN, . , 0 \ 0.5% MIN SLOPE
\ 1. E. 34.15'
SECTION - BIOFILTRA TION PLANTER DRAINAGE RELIEF WELL 3" MIN
-. CLEARANCE AROUND PIPE, / NO SCALE CLASS 2 GRAVEL .
-
"-s--'
* SOIL MEDIA CONSISTS OF 85% WASHED COURSE SAND, 10% FINES (RANGE:
8-12%; 8% = 2 IN/HR INFILTRATION RATE, 12% = 1 IN/HR INFILTRATION RATE),.. -..---..----,--. //
AND 5% ORGANIC MATTER. FOR ADDITIONAL STANDARDS SEE SAN DIEGO LOW IMPACT -
DEVELOPMENT DESIGN MANUAL SECTION 1.2.4.2 SOIL MEDIA MUST MAINTAIN A
MINIMUM INFILTRATION RATE OF 5 IN/HR / /
** FILTER COURSE ONE 3 LAYER OF CLEAN AND WASHED ASTM 33 FINE AGGREGATE-
SAND OVERLYING A 3" LAYER OF ASTM NO. 8 STONE
-
PLAN VIEW - BIOFIL T TION PLANTER
COFFEY ENGINEERING INC NO SCALE . . - •. ••4 - ,• . 0 - - C
15-CM -.
-' t •' -'
- I p
m I
I
I
I
I
I
I
I
Regional WMAA Streams
Watershed Boundaries
Municipal Boundaries
--Rivers & Streams
~~-~ . •·flti
-Potential Critical Coarse Sediment Yield Areas
Potential Critical Coarse Sediment Yield Areas
Regional San Diego County Watersheds
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24 --
25
26
Exhibit Date: Sept. 8, 2014
Santa Margarita River
San Luis Rey River
Buena Vi!ta Creek
Agua Hedionda Creek
San Marcos Creek
Encinitas Creek
Cottonwood Creek (Carlsbad WMA)
Escondido Creek
lsan Dieguito Creek. Reach 1
San Dieguito Creek • Reach 2
Lusardi Creek
Los Penasquitos I Poway Creek
Rattlesnake Creek
I Carroll Canyon Creek
Rose Creek
, San Diego River
Sycamore Creek
Woodglen Vista Creek
1San Vicente Creek
Forester Creek
Chollas Creek
Sweetwater River • Reach 1 ~
Sweetwater River. Reach 2 ~~ Otay River
Jamul I Dulzura Creek
Tijuana River
Geosyntec<> UIQI~
consultants E~c;n..:FFRNG C OMMNY)a
ATTACHMENT 3
Structural BMP Maintenance Information
Use this checklist to ensure the required information has been included in the Structural
BMP Maintenance Information Attachment:
Preliminary Design/PlanningICEQA level submittal:
Attachment 3 must identify-
16 Typical maintenance indicators and actions for proposed structural BMP(s) based
on Section 7.7 oftheBMP Design Manual
Final Design levelsubmittal:
Attachment 3 must identify: -
D Specific maintenance indicators and actions for proposed structural BMP(s). This
shall be based on Section 7.7 of the BMP Design Manual and enhanced to reflect
actual proposed components of the structural BMP(s)
El How to access the structural BMP(s). to inspect and perform maintenance
El Features that are provided to facilitate inspection (e.g., observation ports,
cleanouts, silt posts, or other features that allow the inspector to view necessary
components of the structural BMP and compare to maintenance thresholds)
El Manufacturer and part number for proprietary parts of structural BMl(s) when
applicable
El Maintenance thresholds for BMPs subject to siltation or heavy trash(e.g., silt level
posts or other markings shallbe included in all BMP components that will trap and
store sediment, trash, and/or debris, so that the inspector may determine how full
the BMP is, and the maintenance personnel may determine where the bottom of
the BMP is. If required, posts or other markings shall be indicated and described
on structural BMP plans.)
El Recommended equipment to perform maintenance •
o When. applicable, necessary special training or certification requirements for •
inspection and maintenance personnel such as confined space entry or
hazardous waste management
.
4 •
I .71
ATTACHMENT 3A
i " • Maintenance Plan
I. ,.'• - . - . Abdi Residence
*
Klrl
Accumulation of sediment, litter', or debris .
Remove and properly dispose of accumulated materials,
- without damage to the vegetation.
Poor vegetation establishment . . . Re-seed,- re-plant, or re-establish vegetation per original plans.
Mow or trim asappropriate, but not less than the design height
of 4":
Overgrown vegetation
4 • *4 -
-S..' ••. _'1. S .-. S
.5 . .-,
Erosion due to conentráted irrigation flow' '. Repair/re-seed/re-plant eroded areas and 5adjust the irrigation
- - •. '. . . system.
Repair/re-seed/re-plant eroded areas, and make appropriate
'
. ', '
'- corrective measures such as adding erosion control blankets,,
adding stone at flow entry points, or minor, re-gradihgto Erosion due to concentrated storm water runoff flow restore proper drainage according to the original plan. lithe
issue is not corrected by restoring the BMP to the original plan
and grade, the Engineer shall be contacted to any prior
-, - additional repairs or reconstruction.: . .. , . $•
Make appropriate corrective measures such as adjusting
Standing water in biofiltration with partial retention for irrigation system, removing obstructions of debris or invasive
longer ihan 96 hours following a storm event* ' vegetation, clearing underdrains,or repairing/replacing clogged
orcompacted soils.
Obstructed inlet or outlet structure Clear obstructions
Damage to structural components such as weirs, inlet Repair or replace as applicable. . or outstructures
•.
.7. '
' *
5.-S. ,, •. 5_ ' . . . '.
. .
*These BMPs typically include a surface ponding layer as part of their function which may take 96 hours
I
to drain following a storm event
II, • 5-
S 4 5-
1
I. r 44
1 - S •., ' • . •. . -•. '. • 4 - •5- . * .4 - S . . .; . - .- -. • 4*
I
. • •
_
AbdiResidence - -•. - .. - - - a 4
Treatment BMP Maintenance Plan
V 4 V
. Ta
, . •VV --
fic
c e 1 1 n '4' OEM; t ffiqr,~
fo in iials-it Rni s
Poor vegetation establishment Re-seed, re-establish vegetation
Erosion due to concentrated irrigation Repair/re-seed/re-plant eroded areas and adjust the irrigation,
flow . . system. .
a ,
4V
,
•'
Erosidn due to concentrated storm -: •'
4'
Mow or trim as appropriate, but not less than the'design height.
water runoff flow of 4"
2 '1*
Repair/re-seed/re-plant eroded areas and make appropriate
a
. - • - ." Erosion due to concentrated irrigation flow corrective measures such as adding erosion control blankets,
. . . adding stone at flow entry points, or re-grading where
V
.. necessary;
V ', •- V .
V
- •,. V V •V • .— V
a Accu4mulation of sediment,litter, or. V
• 1 Remove and properly dispose of accumulated materials debris
C.
a
F
J4 1
Make appropriate corrective measures such as adjusting
Standing water
-
- IV. *. irrigation system, removing obstructions of debris or invasive
a a
vegetation, or minor re-grading for proper drainage
- -. V ,' • ,: - t•4VV '. V -
•
., V . a
-
, ' .4 •'; V
V
VV
at 't
'. - a IV. - . - V' - •
' V -
Obstructed inlet or outlet structure -V
V V Clear obstructions. - • •
4 V
- - -- V - -
- •4 - V
- a • .4 4
- - - • 4 a
V V i... - . V, •
S _ •' 44 * •
- V I -, -
. • V -, 1 " - 4 V V
Damage to structural components such- as weirs, inlet
I a -) V •
V V
V
- V - -
V ' V
V 4 - 'V V
- a , , • Repair or replace as applicable. * or outlet structures
*
V
4
U . •'- - -a ' - 4 ••'• • - --.. - V4.'• V' ..V . • 4 4, V • • I - V
V • • - I . • •4.Vj V - V -V. •
,.a ,,' '. V
V
•V V •
il
:
;
:
•4•,
•
-V
a
:
:
' /
a
•
: •
• •
a 2
4—
AbdiResidence
Treatment BMP Maintenance Plan
I Maintenance of Biofiltration Only BMPs
Access of Structural BMPs for Inspection and Maintenance
The Bio-filtration Only BM.Ps consist of one (1) vegetated areas:
I
. BF-1-172ft2
A 1.5'xl'.5' concrete inlet will be installed within the BMP with its rim elevated 10"
I ,
above the surface. The total depth of the inlet will be approximately 3'.
- o The inlet will be visible from the surface and can be accessed through the grate.
The depth will not require a ladder to access the full extent of the inlet.
The biofiltration basin is accessible from the side and back yards of the private
I residence.
I .
• Maintenance Thresholds
Any grasses within the bioftltraiion areas shall be cut when in excess of 4" tall.
I , o Debris & sediment shall be cleared from the basin when 2" have accumulated.
Any amount sediment or debris accumulation observed within the overflow inlet
Shall be removed when seen.
I
o During routine landscape maintenance activities, if bare areas or erosion are
observed they shall be re-seeded.
If standing water is observed for longer than, 24-hours the soil media shall be
I
inspected for clogging and cleaned.
Soil Media Replacement
I . o Soil media within the bioretention area shall be replacel when the filtration rate
drops below 5"/hour if regular maintenance cannot restore this rate.
I . Recommended Maintenance Equipment
I , o Equipment needed for maintenance will typically include those needed for routine
landscape maintenance:
I ,.
Hand Shovels
Wheel barrows
Lawn mower
I . Hedge clippers
Other
, Special Training '
I o Maintenance and inspection activities required are typical for routine landscape
. maintenance. No special training required.
I .' .
• H, .
,. 3''
I , ' . . .
•.
,
, ,
.7
. . ...,
MANTENANCE AGREEMENT DOCUMENT: YES X NO____
RECORDATION NO
PART'Y' RESPONSIBLE FOR MAINTENANCE
NAME BEHROOZABDI CONTACT
ADDRESS 18485 WITHEY ROAD
_MONTE SERENO CA 95030
PHONE NO (858) 245 9395
C.
PLAN PREPARED BY -
NAME MICHAEL C KINNEAR C 76785
COMPANY COFFEY ENGINEERING INC
ADDRESS 9666 BUSINESSPARK AVE.
SUITE 210
SAN DIEGO CA 92131
PHONE NO 858) 831 0111 CERTIFICATION 76785
BMP NOTES
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.
BMPTABLE
_
PID#iBMPTYPE FBfv SYMBOL
]
CASQA NO
[
QUANTITY DRAWING NO SHEETNO(S) INSPECTION
} FREQUENCY
MAINTENANCE
FREQUENCY
TREATMENT CONTROL
BIOFILTRATION
AREA TC32 172 SF, 5028A 58 (SEE BELOW) (SEE BELOW)
HYDROMODIFICATION &TREATMENT CONTROL
N/A
-
1
HYDROMODIFICATION
N/A
LOW IMPACT DESIGN(LI.D.)
SD-1
MAINTAIN NAT.
DRAINAGE SD-i
SD-4 MINIMIZE SOIL
COMPACTION SD-4
SD-7 LANDSCAPE W/
TOLERANT SPECIES SD-7
SOURCE CONTROL
SC -1 ILLICIT DISCHARGES SC 1
PREVENTION OF
SC -2 STORM DRAIN
STENCILING =SC-2
SC-6.1 ON-SITE STORM
DRAIN INLETS =SC-6
SC-6.2 LANDSCAPE/OUTDOOR
PESTICIDE USE =~C-6.2
S063 ISC. DRAIN / WASH
WATER FS 0_IL
CITY OF CARLSBAD SHEETS
ENGINEERINGDEPARTMENT
SINGLE SHEET BMP SITE PLAN
ABDI RESIDENCE
5263 SHORE DRIVE CARLSBAD CA 92008
GR2017_0010
RECORD COPY
INITIAL DATE
PROJECT NO
CDP 2015-0045
DATE INITIAL
REVISION DESCRIPTION
DATE INITIAL DATE INITIAL DRAWING NO
502-8 SW ENGINEER OF WORK OTHER APPROVAL CITY APPROVAL
- I - ______ _________-