HomeMy WebLinkAboutCDP 2016-0005; KLOVANISH RESIDENCE; STORM WATER QUALITY MANAGEMENT PLAN; 2019-04-29...
CITY OF CARLSBAD
PRIORITY DEVELOPMENT PROJECT (PDP)
STORM WATER QUALITY MANAGEMENT PLAN (SWQMP)
Klovanish Residence
Project ID No. CDP2016-0005
Drawing No.503-9A
GR No. 2017-0026
ENGINEER OF WO
Daniel Valdez, RCE 76074
[INSERT Clvtt ENGINEER'S NA~FBJ:!e ,
~uv ED1'JEr ------
RECE IVED
JUN 1 7 2019
LAND DEVELOPMENT
EN INEE~~ll'.JG
PREPARED FOR:
Steve Klovanish
2721 Carlsbad Blvd .
Carlsbad, CA 92008
PREPARED BY:
Coffey Engineering 9666
Businesspark Avenue, Suite 210 San
Diego, CA 92131 (858) 831 -0111
dan@coffeyengineering.com
DATE:
11/30/17
Revised 4/29/19
RECORD COPY
Initial L-------·--·
.....,
C
0 (-.1 _,.:
0 . -·-
TABLE OF CONTENTS
Certification Page
Project Vicinity Map
FORM E-34 Storm Water Standard Questionnaire
Site Information
FORM E-36 Standard Project Requirement Checklist
Summary of PDP Structural BMPs
Attachment 1: Backup for PDP Pollutant Control BMPs
Attachment 1 a: OMA Exhibit
Attachment 1 b: Tabular Summary of DMAs and Design Capture Volume Calculations
Attachment 1 c: Harvest and Use Feasibility Screening (when applicable)
Attachment 1d: Categorization of Infiltration Feasibility Condition (when applicable)
Attachment 1 e: Pollutant Control BMP Design Worksheets / Calculations
Attachment 2: Backup for PDP Hydromodification Control Measures
Attachment 2a: Hydromodification Management Exhibit
Attachment 2b: Management of Critical Coarse Sediment Yield Areas
Attachment 2c: Geomorphic Assessment of Receiving Channels
Attachment 2d: Flow Control Facility Design
Attachment 3: Structural BMP Maintenance Thresholds and Actions
Attachment 4: Single Sheet BMP (SSBMP) Exhibit
4/29/19
...
Project Name:
Project ID:
CERTIFICATION PAGE
Klovanish Residence
CDP2016-0005
I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs
for this project, and that I have exercised responsible charge over the design of the project as
defined in Section 6703 of the Business and Professions Code, and that the design is consistent
with the requirements of the BMP Design Manual, which is based on the requirements of
SDRWQCB Order No. R9-2013-0001 (MS4 Permit) or the current Order.
I have read and understand that the City Engineer has adopted minimum requirements for
managing urban runoff, including storm water, from land development activities , as described in
the BMP Design Manual. I certify that this SWQMP has been completed to the best of my ability
and accurately reflects the project being proposed and the applicable source control and site
design BMPs proposed to minimize the potentially negative impacts of this project's land
development activities on water quality. I understand and acknowledge that the plan check
review of this SWQMP by the City Engineer is confined to a review and does not rel ieve me, as
the Engineer in Responsible Charge of design of storm water BMPs for this project, of my
responsibilities for project design.
el· f6o1(
Ignature, PE Number & Expiration Da e
Daniel Valdez
Print Name
Coffey Engineering
Company
4/29/19
Date
4/29/19
PROJECT VICINITY MAP
VICINITY MAP
THOMAS BROS. MAP 1106-G7
NO SCALE
•
4/29/19
..
[Insert City's Storm Water Standard Questionnaire (Form E-34) here]
4/29/19
{_ City of
Carlsbad
STORM WATER STANDARDS
QUESTIONNAIRE
Development Services
Land Development Engineering
1635 Faraday Avenue
(760) 602-2750
www .ca rlsbad ca .gov
E-34
I INSTRUCTIONS:
To address post-development pollutants that may be generated from development projects, the city requires that new
development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management
Practices (BMPs) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual,
refer to the Engineering Standards (Volume 5).
This questionnaire must be completed by the applicant in advance of submitting for a development application
(subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of
storm water standards that must be applied to a proposed development or redevelopment project. Depending on the
outcome, your project will either be subject to 'STANDARD PROJECT' requirements or be subject to 'PRIORITY
DEVELOPMENT PROJECT' (PDP) requirements.
Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City
staff has responsibility for making the final assessment after submission of the development application . If staff
determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than
initially assessed by you, this will result in the return of the development application as incomplete. In this case, please
make the changes to the questionnaire and resubmit to the city.
If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the
questions, please seek assistance from Land Development Engineering staff.
A completed and signed questionnaire must be submitted with each development project application. Only one
completed and signed questionnaire is required when multiple development applications for the same project are
submitted concurrently.
PROJECT INFORMATION
PROJECT NAME: Klovanish Residence PROJECT ID : CDP2016-0005
ADDRESS: 4000 Block of Adams Street APN : 206-180-41
The project is ( check one): 1Z] New Development D Redevelopment
The total proposed disturbed area is: 18,614 ft2 ( 0.43 ) acres
The total proposed newly created and/or replaced impervious area is: 7,508 ft2 ( 0.172 ) acres
If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the
SWQMP # of the larger development project:
Project ID Dwg . No. 503-9A SWQMP #: GR2017-0026
Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your
application to the city.
E-34 Page 1 of 4 REV 02/16
STEP 1
TO BE COMPLETED FOR ALL PROJECTS
To determine if your project is a "development project", please answer the following question:
YES NO
Is your project LIMITED TO routine maintenance activity and/or repa ir/improvements 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 complete applicant
information.
Justification/discussion: (e .g. the project includes only interior remodels within an existing building):
If you answered "no" to the above question, the project is a 'development project', go to Step 2.
STEP 2
TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS
To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provision E.3.b.(3), please answer
the following questions:
Is your project LIMITED to one or more of the following:
YES NO
1. Constructing new or retrofitting pa ved sidewalks, bicycle lanes or trails that meet the following criteria:
a) Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non -
erodible permeable areas; □ ~ b) Designed and constructed to be hydraulically disconnected from paved streets or roads;
c) Designed and constructed with permeable pavements or surfaces in accordance with USEPA
Green Streets guidance?
2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in □ ~ accordance with the USEPA Green Streets guidance?
3. Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual? □ ~
If you answered "yes" to one or more of the above questions, provide discussion/justification below, then go to Step 5, mark
the second box stating "my project is EXEMPT from PDP ... " and complete applicant information.
Discussion to justify exemption ( e.g. the project redeveloping existing road designed and constructed in accordance with
the USEPA Green Street guidance):
If you answered "no" to the above questions, your project is not exempt from PDP, ~o to Step 3.
E-34 Page 2 of 4 REV 02/16
~
STEP3
TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS
To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1 )):
YES NO
1. Is your project a new development that creates 10,000 square feet or more of impervious surfaces
collectively over the entire project site? This includes commercial, industrial, residential, mixed-use, □ Ill
and public development projects on public or private land.
2. Is your project a redevelopment project creating and/or replacing 5,000 square feet or more of
impervious surface collectively over the entire project site on an existing site of 10,000 square feet or □ [2J more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public
development projects on public or private land.
3. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more
of impervious surface collectively over the entire project site and supports a restaurant? A restaurant is
a facility that sells prepared foods and drinks for consumption, including stationary lunch counters and □ Ill
refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial
Classification (SIC) code 5812).
4. Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious
surface collectively over the entire project site and supports a hillside development project? A hillside Ill □ development project includes development on anv natural slooe that is twenty-five percent or Qreater.
5. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more
of impervious surface collectively over the entire project site and supports a parking lot? A parking lot is □ Ill a land area or facility for the temporary parking or storage of motor vehicles used personally for
business or for commerce.
6. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more
of impervious surface collectively over the entire project site and supports a street, road, highway Ill □ freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface
used for the transportation of automobiles, trucks, motorcycles, and other vehicles.
7. Is your project a new or redevelopment project that creates and/or replaces 2,500 square feet or more
of impervious surface collectively over the entire site, and discharges directly to an Environmentally
Sensitive Area (ESA)? "Discharging Directly to" includes flow that is conveyed overland a distance of □ Ill
200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an
isolated flow from the project to the ESA (i.e. not commingled with flows from adjacent lands).*
8. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square
feet or more of impervious surface that supports an automotive repair shop? An automotive repair □ Ill shop is a facility that is categorized in any one of the following Standard Industrial Classification (SIC)
codes: 5013, 5014, 5541, 7532-7534, or 7536-7539.
9. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square
feet or more of impervious area that supports a retail gasoline outlet (RGO)? This category includes □ IZI RGO's that meet the following criteria: (a) 5,000 square feet or more or {b) a project Average Daily
Traffic (ADT) of 100 or more vehicles per day.
10. Is your project a new or redevelopment project that results in the disturbance of one or more acres of land □ Ill and are expected to generate pollutants post construction?
11 . Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of
impervious surface or (2) increases impervious surface on the property by more than 10%? (CMC □ Ill
21.203.040)
If you answered "yes" to one or more of the above questions, your project is a PDP. If your project is a redevelopment
project, go to step 4. If your project is a new project, go to step 5, check the first box stating "My project is a PDP ... "
and complete applicant information.
If you answered "no" to all of the above questions, your project is a 'STANDARD PROJECT.' Go to step 5, check the
second box statinq "Mv project is a 'STANDARD PROJECT' ... " and complete applicant information.
E-34 Page 3 of 4 REV 02/16
-STEP 4
TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP)
ONLY
Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3.b.(2)):
Does the redevelopment project result in the creation or replacement of impervious surface in an amount
of less than 50% of the surface area of the previously existing development? Complete the percent
impervious calculation below:
Existing impervious area (A) = _____________ sq . ft.
Total proposed newly created or replaced impervious area (B) = ____________ sq.ft.
Percent impervious area created or replaced (B/A)*100 = _____ %
YES NO
□ □
If you answered "yes", the structural BMPs required for PDP apply only to the creation or replacement of impervious
surface and not the entire development. Go to step 5, check the first box stating "My project is a PDP ... " and complete
applicant information.
If you answered "no," the structural BM P's required for PDP apply to the entire development. Go to step 5, check the
check the first box stating "My project is a PDP ... " and complete applicant information.
STEP 5
CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION
Ill My project is a PDP and must comply with PDP stormwater requirements of the BMP Manual. I understand I must
prepare a Storm Water Quality Management Plan (SWQMP) for submittal at time of application.
□ My project is a 'STANDARD PROJECT' OR EXEMPT from PDP and must only comply with 'STANDARD PROJECT'
stormwater requirements of the BMP Manual. As part of these requirements, I will submit a "Standard Project
Requirement Checklist Form E-36" and incorporate low impact development strategies throughout my project.
Note: For projects that are close to meeting the PDP threshold, staff may require detailed impervious area calculations
and exhibits to verify if 'STANDARD PROJECT' stormwater requirements apply.
D My Project is NOT a 'development project' and is not subject to the requirements of the BMP Manual.
Applicant Information and Signature Box
Applicant Title: _C_i_vi_l _E_n_g_in_e_e_r _________ _
Date: 4/ 29/ 19
* Environmentally Sens1t1ve Areas include but are not l1m1ted 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 preserves or their equivalent under the Multi Species Conservation Program within the Cities and County of San Diego; Habitat
Management Plan; and any other equivalent environmentally sensitive areas which have been identified by the City.
Th" B t, c· U O I IS ox or ,tv se nrv
YES NO
City Concurrence: □ □
By:
Date:
Project ID:
E-34 Page 4 of 4 REV 02/16
SITE INFORMATION CHECKLIST
Project Summary Information
Project Name Klovanish Residence
Project ID CDP 2016-0005
Project Address 4385 Adams Street
Carlsbad, CA 92008
Assessor's Parcel Number(s) (APN(s)) APN: 206-180-41
Project Watershed (Hydrologic Unit) Carlsbad 904
Parcel Area 0.427 ( 18,614 Acres Square Feet)
Existing Impervious Area -0-Acres ( -0-Square Feet) (subset of Parcel Area)
Area to be disturbed by the project 0.427 Acres ( 18,614 Square Feet) (Project Area)
Project Proposed Impervious Area 0.172 Acres ( 7,508 Square Feet) (subset of Project Area)
Project Proposed Pervious Area 0.258 Acres ( 11 ,242 Square Feet) (subset of Project Area)
Note: Proposed Impervious Area+ Proposed Pervious Area= Area to be Disturbed by the
Project.
This may be less than the Parcel Area.
4/29/19
Description of Existing Site Condition and Drainage Patterns
Current Status of the Site (select all that apply):
□ Existing development
□ Previously graded but no,t built out
□ Agricultural or other non-impervious use i Vacant, undeveloped/natural
Description/ Additional Information:
Existing Land Cover Includes (select all that apply): i Vegetative Cover
□ Non-Vegetated Pervious Areas
□ Impervious Areas
Description/ Additional Information:
Underlying Soil belongs to Hydrologic Soil Group (select all that apply):
D NRCS Type A
i NRCS Type B
D NRCS Type C
D NRCS Type D
Approximate Depth to Groundwater (GW):
D GW Depth < 5 feet tf 5 feet < GW Depth < 10 feet
□ 10 feet < GW Depth < 20 feet
D GW Depth > 20 feet
Existing Natural Hydrologic Features (select all that apply):
□ Watercourses
□ Seeps
□ Springs
□ Wetlands
tlNone
Description/ Additional Information:
4/29/19
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. Existing storm water conveyance is natural.
2. There are no existing constructed storm water conveyance systems within the site.
3. Runoff from the adjacent properties to the northeast is conveyed through the site .
These two properties discharge runoff from their backyards via sheet flow to the rear of
the subject lot. Stormwater entering the lot as well as falling onto the lot flows
southwesterly to Adams Street (via sheet flow).
4/29/1 9
Description of Proposed Site Development and Drainage Patterns
Project Description / Proposed Land Use and/or Activities:
Proposed is construction of a single family residence with attached garage, pool,
driveway, above ground barbecue and alfresco deck.
List/describe proposed impervious features of the project (e.g ., buildings, roadways , parking
lots, courtyards, athletic courts, other impervious features):
The proposed impervious features of the site w ill include a house, driveway, and
miscellaneous hardscape (i.e . covered lanai, covered rear patio).
List/describe proposed pervious features of the project (e.g., landscape areas):
Pervious features of the project are landscaping and a biofiltration area (for stormwater
quality).
~es the project include grading and changes to site topography?
Yes
□No
Description/ Additional Information:
Grading will be done to create a crawlspace (which will support a raised foundation), a
driveway, and required street widening along the project frontage.
Does the project include changes to site drainage (e.g., installation of new storm water
conveyance systems)?
ilYes
□No
Descriotion / Additional Information:
Small diameter landscape drains will be installed around the perimeter of the new house.~
-:.,:-,_'' •::: ::: :·efiltFatieA aFea f9F tFeatFAeAt. +l=le eiefiltFatieA aFea wUl-#teA Elisel=laF§e ti:eates Ftmeff tea
u ,uergrour,d storage system equipped with a reduces si:ce oFifice foF l=lytl:FOfflesif'ieatioA eeAtFSI. UltiFAately,
... L-_ --_: ... __ .., ___ _J __ ;...,, ~ ·:I' :·s€flaf§e te Asaffts StFeet. -J
All landscape drains and roof downspouts will then be directed to one of three tree wells sized to
meet both water quality and hydromodification requirements. All tree wells will be installed with an
overflow outlet to prevent flooding in heavier storms. These oveflow outlets all tie together and
discharge to a single curb outlet along Adams Street.
4/29/19
Identify whether any of the following features, activities, and/or pollutant source areas will be
present (select all that apply): i On-site storm drain inlets
D Interior floor drains and elevator shaft sump pumps
D Interior parking garages
D Need for future indoor & structural pest control
i Landscape/Outdoor Pesticide Use
if Pools, spas, ponds, decorative fountains, and other water features
□ Food service ~ Refuse areas
D Industrial processes
D Outdoor storage of equipment or materials
D Vehicle and Equipment Cleaning
D Vehicle/Equipment Repair and Maintenance
D Fuel Dispensing Areas
D Loading Docks
t1' Fire Sprinkler Test Water
D Miscellaneous Drain or Wash Water
D Plazas, sidewalks, and parking lots
4/29/19
Identification of Receiving Water Pollutants of Concern
Describe path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or
reservoir, as applicable):
Runoff from the site enters the public storm drain system through a grated inlet approximately
300 ft. northwest of the site. This inlet is connected to a storm drain that discharges at the
opposite side of Adams St. and then 300' down a slope to the Agua Hedionda Lagoon.
List any 303(d) impaired water bodies within the path of storm water from the project site to the
Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable), identify the
pollutant(s)/stressor(s) causing impairment, and identify any TMDLs for the impaired water
bodies:
303(d) Impaired Water Body Pol I utant( s )/Stress or( s) TMDLs
None within the path from the
project.
Identification of Project Site Pollutants
Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see
BMP Desiqn Manual Appendix 8.6):
Also a Receiving
Not Applicable to Anticipated from the Water Pollutant of
Pollutant the Project Site Project Site Concern
Sediment X N/A
Nutrients X N/A
Heavy Metals X N/A
Orqanic Compounds X N/A
Trash & Debris X N/A
Oxygen Demanding X N/A Substances
Oil & Grease X N/A
Bacteria & Viruses X N/A
Pesticides X N/A
4/29/19
Hydromodification Management Requirements
Do hydromodification management requirements apply (see Section 1.6 of the BMP Design
Manual)?
~ Yes, hydromodification management flow control structural BMPs required.
D No, the project will discharge runoff directly to existing underground storm drains discharging
directly to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean.
□ No, the project will discharge runoff directly to conveyance channels whose bed and bank are
concrete-lined all the way from the point of discharge to water storage reservoirs, lakes,
enclosed embayments, or the Pacific Ocean.
D No, the project will discharge runoff directly to an area identified as appropriate for an
exemption by the WMAA for the watershed in which the project resides.
Description/ Additional Information (to be provided if a 'No' answer has been selected above):
Critical Coarse Sediment Yield Areas*
*This Section only required if hydromodification management requirements apply
Based on the maps provided within the WMAA, do potential critical coarse sediment yield areas
exist within the project drainage boundaries?
□Yes i No , No critical coarse sediment yield areas to be protected based on WMAA maps
If yes , have any of the optional analyses presented in Section 6.2 of the BMP Design Manual
been performed?
D 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite
D 6.2.2 Downstream Systems Sensitivity to Coarse Sediment
D 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite
□ No optional analyses performed, the project will avoid critical coarse sediment yield areas
identified based on WMAA maps
If optional analyses were performed , what is the final result?
□ No critical coarse sediment yield areas to be protected based on verification of GLUs onsite
D Critical coarse sediment yield areas exist but additional analysis has determined that
protection is not required. Documentation attached in Attachment 8 of the SWQMP.
D Critical coarse sediment yield areas exist and require protection. The project will implement
management measures described in Sections 6.2.4 and 6.2.5 as applicable, and the areas
are identified on the SWQMP Exhibit.
Discussion / Additional Information:
4/29/19
Flow Control for Post-Project Runotr
*This Section only required if hydromodification management requirements apply
List and describe point(s) of compliance (POCs) for flow control for hydromodification
management (see Section 6.3.1 ). For each POC, provide a POC identification name or number
correlating to the project's HMP Exhibit and a receiving channel identification name or number
correlating to the project's HMP Exhibit.
There is one (1) point of compliance. This point is identified as "POC1" on the project's
HMP exhibit. This point corresponds to the proposed 0-27 pipe outlet approximately 40'
southeast of the western most property corner of the subject property.
Has a geomorphic assessment been performed for the receiving channel(s)? i No , the low flow threshold is 0.102 (default low flow threshold)
D Yes, the result is the low flow threshold is 0.102
D Yes, the result is the low flow threshold is 0.302
D Yes, the result is the low flow threshold is 0.502
If a geomorphic assessment has been performed, provide title, date, and preparer:
Discussion/ Add itional Information: (optional)
Other Site Requirements and Constraints
When applicable, list other site requirements or constraints that will influence storm water
management design, such as zoning requirements including setbacks and open space, or City
codes governing minimum street width, sidewalk construction, allowable pavement types, and
drainage requirements.
The topography of the site combined with the required street widening improvements
limit the possible locations of any treatment/storage facilities within the site.
Optional Additional Information or Continuation of Previous Sections As Needed
This space provided for additional information or continuation of information from previous
sections as needed.
[Insert City's Standard Project Requirement Checklist Form E-36 (here)]
SUMMARY OF PDP STRUCTURAL BMPS
C City of
Carlsbad
Project Name: Klovanish Residence
Project ID: CDP2016-0005
STANDARD PROJECT
REQUIREMENT
CHECKLIST
E-36
Project Information
DWG No . or Building Permit No.: 503-9A
Source Control BMPs
Development Services
Land Development Engineering
1635 Faraday Avenue
(760) 602-2750
www.carlsbadca.gov
All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See
Chapter 4 and Appendix E.1 of the BMP Design Manual for information to implement source control BMPs shown in this
checklist.
Answer each category below pursuant to the following.
• "Yes" means the project will implement the source control BMP as described in Chapter 4 and/or Appendix E.1 of the
Model BMP Design Manual. Discussion/justification is not required.
• "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be
provided . Please add attachments if more space is needed.
• "N/A" means the BMP is not applicable at the project site because the project does not include the feature that is
addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion/justification may be
provided.
Source Control Requirement Applied?
SC-1 Prevention of Illicit Discharges into the MS4 l2l Yes □ No 0 N/A
Discussion/justification if SC-1 not implemented:
SC-2 Storm Drain Stenciling or Signage □ Yes Ill No □ N/A
Discussion/justification if SC-2 not implemented:
Only small on-site landscape drains will be implemented.
SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On , Runoff, and Wind D Yes l2l No □ N/A Dispersal
Discussion/justification if SC-3 not implemented:
There will be no permanent outdoor material storage areas (project is a single family residence).
E-36 Page 1 of 4 Revised 03/16
Source Control Requirement (continued) Applied?
' SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and □ Yes Ill No □ N/A Wind Dispersal
Discussion/justification if SC-4 not implemented:
There will be no permanent outdoor work areas where materials would be stored (project is a single family residence).
SC-5 Protect Trash Storage Areas from Rainfall, Run -On , Runoff, and Wind Dispersal Ill Yes □ No □ N/A
Discussion/justification if SC-5 not implemented:
Trash bins shall have lids that will be kept closed.
SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and
identify additional BMPs. (See Table in Appendix E.1 of BMP Manual for quidance).
Ill On -site storm drain inlets Ill Yes □ No □ N/A
□ Interior floor drains and elevator shaft sump pumps □ Yes □ No Ill N/A
□ Interior parking garages □ Yes □ No Ill N/A
□ Need for future indoor & structural pest control □ Yes □ No Ill N/A
Ill Landscape/Outdoor Pesticide Use Ill Yes □ No □ N/A
Ill Pools, spas, ponds, decorative fountains, and other water features Ill Yes □ No □ N/A
□ Food service □ Yes □ No Ill N/A
□ Refuse areas □ Yes □ No Ill N/A
□ Industrial processes □ Yes □ No Ill N/A
□ Outdoor storage of equipment or materials □ Yes □ No Ill N/A
□ Vehicle and Equipment Cleaning □ Yes □ No Ill N/A
□ Vehicle/Equipment Repair and Maintenance □ Yes □ No Ill N/A
□ Fuel Dispensing Areas □ Yes □ No Ill N/A
□ Loading Docks □ Yes □ No Ill N/A
Ill Fire Sprinkler Test Water Ill Yes □ No □ N/A
□ Miscellaneous Drain or Wash Water □ Yes □ No Ill N/A
□ Plazas, sidewalks, and parking lots □ Yes □ No Ill N/A
For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers.
Project is a single family residence.
E-36 Page 2 of 4 Revised 03/16
Site Design BMPs t
All development projects must implement site design BMPs SD -1 through SD-8 where applicable and feasible. See
Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual for information to implement site design BMPs shown in
this checklist.
Answer each category below pursuant to the following.
• "Yes" means the project will implement the site design BMPs as described in Chapter 4 and/or Appendix E.2 thru E.6 of
the Model BMP Design Manual. Discussion/ justification is not required .
• "No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be
provided. Please add attachments if more space is needed.
• "N/A" means the BMPs is not applicable at the project site because the project does not include the feature that is
addressed by the BMPs (e.g., the project site has no existing natural areas to conserve). Discussion/justification may be
provided.
Source Control Requirement I Applied?
SD-1 Maintain Natural Drainage Pathways and Hydrologic Features I '2:1 Yes I □ No I □ N/A
Discussion/justification if SD-1 not implemented:
SD-2 Conserve Natural Areas, Soils, and Vegetation I '2:1 Yes I □ No I □ N/A
Discussion/justification if SD-2 not implemented:
SD-3 Minimize Impervious Area I '2:1 Yes I □ No I □ N/A
Discussion/justification if SD-3 not implemented:
SD-4 Minimize Soil Compaction I Ill Yes I □ No I □ N/A
Discussion/justification if SD-4 not implemented:
SD-5 Impervious Area Dispersion I '2:1 Yes I □ No I □ N/A
Discussion/justification if SD-5 not implemented:
E-36 Page 3 of 4 Revised 03/16
Source Control Requirement (continued) I Applied?
SD-6 Runoff Collection I ~ Yes I □ No I □ N/A
Discussion/justification if SD-6 not implemented:
SD-7 Landscaping with Native or Drought Tolerant Species I ~ Yes I □ No I □ N/A
Discussion/justification if SD-7 not implemented:
SD-8 Harvesting and Using Precipitation I □ Yes I ~ No I □ N/A
Discussion/justification if SD -8 not implemented:
Minimal amount of landscaping. Not sufficient demand for harvest & re-use.
E-36 Page 4 of 4 Revised 03/16
PDP Structural BMPs
All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of
the BMP Design Manual). Selection of PDP structural BMPs for storm water pollutant control
must be based on the selection process described in Chapter 5. PDPs subject to
hydromodification management requirements must also implement structural BMPs for flow
control for hydromodification management (see Chapter 6 of the BMP Design Manual). Both
storm water pollutant control and flow control for hydromodification management can be
achieved within the same structural BMP(s).
PDP structural BMPs must be verified by the City at the completion of construction . This may
include requiring the project owner or project owner's representative to certify construction of
the structural BMPs (see Section 1.12 of the BMP Design Manual). PDP structural BMPs must
be maintained into perpetuity, and the City must confirm the maintenance (see Section 7 of the
BMP Design Manual).
Use this form to provide narrative description of the general strategy for structural BMP
implementation at the project site in the box below. Then complete the PDP structural BMP
summary information sheet for each structural BMP within the project (copy the BMP summary
information page as many times as needed to provide summary information for each individual
structural BMP).
Describe the general strategy for structural BMP implementation at the site. This information
must describe how the steps for selecting and designing storm water pollutant control BMPs
presented in Section 5.1 of the BMP Design Manual were followed, and the results (type of
BMPs selected). For projects requiring hydromodification flow control BMPs, indicate whether
pollutant control and flow control BMPs are integrated together or separate.
Step 1A -One (1) DMA within the site was determined to be self-mitigating (SMA 1 ). It
consists mainly of landscaped areas, contains less than 5% impervious areas, is not
hydraulically connected to other impervious areas and is separate from DMAs that
contain pollutant control BMPs.
One DMA was determined to be de minimis (Area B.1 ). It is small in nature (250 SF),
abuts the perimeter of the site, is not adjacent to another de minimis area, and the
topography and land ownership constraints make BMP construction to reasonably
capture runoff technically infeasible without a pump system placed in the public ROW.
REVISION
Three DMA's were designed to be self-retaining through the use of tree wells.
These are DMA A.1.1, A.1.2, and A.1.3
[Continued from previous page -This page is reserved for continuation of description of general
strategy for structural BMP implementation at the site .]
Step 1 B -Runoff factors adjusted to account for site design BMPs and soil type. No
street trees or rain barrels implemented.
Step 2 -Harvest & Use considered infeasible. The 36 hour demand is less than
0.25DCV.
Step 3 -Partial Infiltration determined to be feasible based on site specific infiltration
testing conducted by Geotechnical Exploration, Inc. See report dated August 14, 2017.
~~l"l'tfl,~~~~~~~~~ffl-l-~¥.il-?WA1ft~cte-ff}M~--tot~~NetJ~i-Rfl>'Stt
sei~oa was-si:Z:etJ to fifl eet-a~-foasHfle mif'l+fflttt'fl Desi~R Gaptt1 re Velurne-
~ . · -~~~ff"Ml~taehflle 11t 5-:=
REVISION
Tree wells were determined to be the best option, meeting both water quality/
hydromodification requirements as well as design goals from the owner. Each tree
well was designed to accommodate twice the DCV.
Step 4 -BMPs as sized will have enough capacity for DCV.
Structural BMP Summary Information
[Copy this page as needed to provide information for each individual proposed
structural BMP
Structu I BMP ID No. IMP A.1
DWG Sheet No. Dwg . No. 503-9A Sheet 2
ral BMP:
D Retention by rvest and use (HU -1)
D Retention by in ration basin (INF-1)
D Retention by bior ntion (INF-2)
D Retention by perme le pavement (INF-3) if Partial retention by bio · tration with partial retention (PR-1)
D Biofiltration (BF-1)
D Flow-thru treatment control eluded as pre-treatment/forebay fo
biofiltration BMP (provide BM type/description and indicate w.
biofiltration BMP it serves in dis ssion section below)
D Detention pond or vault for hydro dification manageme
D Other (describe in discussion sectio elow)
Purpose: if Pollutant control only
D Hydromodification control only
D Combined pollutant control and hydromodifi tio
D Pre-treatment/forebay for another structu BMP
D Other (describe in discussion section b ow)
Discussion (as needed):
Based on the infiltration rates measur
All runoff is routed to the biofiltra · n (with partail retention) area for treat
biofiltration area then flows to ingle below ground storage system (A.2)
requ ired.
nt only (IMP A.1 ). The
·ch shall provide all retention
11 /29/17
Structural BMP Summary Information
[Copy this page as needed to provide information for each individual proposed
structural BMP
l----'---'---'------_._.-~-=-S-h_e_et_N------'--o. Dwg. No. 503-9A Sheet 2
Type of stru ural BMP:
□ Retention b arvest and use (HU-1)
□ Retention by in · tration basin (INF-1)
□ Retention by bior ention (INF-2)
□ Retention by perme le pavement (INF-3)
D Partial retention by bi ·Itration with partial retention (PR-1)
D Biofiltration (BF-1)
□ Flow-thru treatment contro · eluded as pre-treatment/forebay fo an onsite retention or
biofiltration BMP (provide B type/description and indicate ich onsite retention or
biofiltration BMP it serves in dis ssion section below) -6 Detention pond or vault for hydro dification manageme
D Other (describe in discussion sectio below)
Purpose:
D Pollutant control only !1' Hydromodification control only
D Combined pollutant control and hydromodif ati
D Pre-treatment/forebay for another struct I BMP
D Other (describe in discussion section ow)
Discussion (as needed):
Based on the infiltration rates measu
All runoff is routed to the biofiltr · n (with partail retention) area for treat
biofiltration area then flows to single below ground storage system (A.2)
required.
nt only (IMP A.1 ). The
ich shall provide all retention
4/29/19
Structural BMP Summary Information
[Copy this page as needed to provide information for each individual proposed
structural BMPl
Structural BMP ID No. IMP A.1.1
DWG Sheet No. Dwg . No . 503-9A Sheet 2
Type of structural BMP:
D Retention by harvest and use (HU-1)
D Retention by infiltration basin (INF-1)
D Retention by bioretention (INF-2)
D Retention by permeable pavement (INF-3)
D Partial retention by biofiltration with partial retention (PR-1)
D Biofiltration (BF-1)
D Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or
biofiltration BMP (provide BMP type/description and indicate which onsite retention or
biofiltration BMP it serves in discussion section below)
D Detention pond or vault for hydromodification management lf Other (describe in discussion section below)
Purpose:
D Pollutant control only
D Hydromodification control only lf Combined pollutant control and hydromodification control
D Pre-treatment/forebay for another structural BMP
D Other (describe in discussion section below)
Discussion (as needed):
OMA A.1 .1 consists of the northeast quadrant of the house , and the east half of the back yard . Storm water
is collected by small landscape drainage and roof gutters/down spouts and is directed to a 20' diameter
(mature canopy) Southern Magnolia tree . The soil media shall be 30" min . depth lying below a minimum
5'x5' grate.
4/29/19
Structural BMP Summary Information
[Copy this page as needed to provide information for each individual proposed
structural BMP]
Structural BMP ID No. IMP A.1 .2
DWG Sheet No. Dwg. No. 503-9A Sheet 2
Type of structural BMP:
D Retention by harvest and use (HU-1)
D Retention by infiltration basin (INF-1)
D Retention by bioretention (INF-2)
D Retention by permeable pavement (INF-3)
D Partial retention by biofiltration with partial retention (PR-1)
D Biofiltration (BF-1)
D Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or
biofiltration BMP (provide BMP type/description and indicate which onsite retention or
biofiltration BMP it serves in discussion section below)
D Detention pond or vault for hydromodification management
tf Other (describe in discussion section below)
Purpose:
□ Pollutant control only
D Hydromodification control only
tf Combined pollutant control and hydromodification control
D Pre-treatment/forebay for another structural BMP
D Other (describe in discussion section below)
Discussion (as needed):
DMA A.1 .2 consists of the driveway, the northwest quadrant of the house, and the west half of the back
yard. Storm water is collected by small landscape drainage and roof gutters/down spouts and is directed to
a 27' diameter (mature canopy) Sweet Gum tree . The soil media shall be 30" min. depth lying below a
minimum 5'x5' grate .
4/29/19
Structural BMP Summary Information
(Copy this page as needed to provide information for each individual proposed
structural BMP]
Structural BMP ID No. IMP A.1.3
DWG Sheet No. Dwg. No. 503-9A Sheet 2
Type of structural BMP:
D Retention by harvest and use (HU-1)
D Retention by infiltration basin (INF-1)
D Retention by bioretention (INF-2)
D Retention by permeable pavement (INF-3)
□ Partial retention by biofiltration with partial retention (PR-1)
D Biofiltration (BF-1)
D Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or
biofiltration BMP (provide BMP type/description and indicate which onsite retention or
biofiltration BMP it serves in discussion section below)
D Detention pond or vault for hydromodification management i Other (describe in discussion section below)
Purpose:
D Pollutant control only
D Hydromodification control only i Combined pollutant control and hydromodification control
D Pre-treatment/forebay for another structural BMP
D Other (describe in discussion section below)
Discussion (as needed):
DMA A.1.3 consists of the south half of the house. Storm water is collected by roof gutters/down spouts
and is directed to a 22' diameter (mature canopy) Southern Magnolia tree. The soil media shall be 30" min.
depth lying below a minimum 5'x5' grate.
4/29/19
ATTACHMENT 1
BACKUP FOR PDP POLLUTANT CONTROL BMPS
Th is is the cover sheet for Attachment 1.
Check which Items are Included behind this cover sheet:
Attachment Contents Checklist
Sequence
Attachment 1 a OMA Exhibit (Required) tl Included
See OMA Exhibit Checklist on the
back of this Attachment cover sheet.
(24"x36" Exhibit typically required)
Attachment 1 b Tabular Summary of DMAs Showing tJ Included on OMA Exhibit in
Attachment 1 c
Attachment 1 d
OMA ID matching OMA Exhibit, OMA Attachment 1 a
Area , and OMA Type (Required)* □ Included as Attachment 1 b,
*Provide table in this Attachment OR
on OMA Exhibit in Attachment 1 a
Form 1-7, Harvest and Use Feasibility
Screening Checklist (Required unless
the entire project will use infiltration
BMPs)
Refer to Appendix B.3-1 of the BMP
Design Manual to complete Form 1-7.
Form 1-8, Categorization of Infiltration
Feasibility Condition (Required unless
the project will use harvest and use
BMPs)
Refer to Appendices C and D of the
BMP Design Manual to complete
Form 1-8.
separate from OMA Exhibit
{i Included
□ Not included because the entire
project will use infiltration BMPs
,
tl Included
□ Not included because the entire
project will use harvest and use
BMPs
Attachment 1 e Pollutant Control BMP Design {i Included
Worksheets/ Calculations (Required)
Refer to Appendices B and E of the
BMP Design Manual for structural
pollutant control BMP design
guidelines
Use this checklist to ensure the required information has been included on the DMA
Exhibit:
The OMA Exhibit must identify:
if Underlying hydrologic soil group i Approximate depth to groundwater
'6 Existing natural hydrologic features (watercourses, seeps, springs, wetlands) i Critical coarse sediment yield areas to be protected (if present)
i Existing topography and impervious areas
!1' Existing and proposed site drainage network and connections to drainage offsite !1' Proposed grading
i Proposed impervious features
i Proposed design features and surface treatments used to minimize imperviousness i Drainage management area (OMA) boundaries, OMA ID numbers, and OMA areas (square
footage or acreage), and OMA type (i.e., drains to BMP, self-retaining, or self-mitigating)
'6 Structural BMPs (identify location and type of BMP)
<
Impervious/
Developed Area Pervious Biofiltration
(SF) Area (SF} Area (SF)
Pool/Water
Feature (SF)
A.1 (Drains to
Biofiltration)
SMA 1 (Self
Mitigating Area)
B.1 (De
Minimus)
Total
Developed
4,680 236
250
7,508 9,759
LEGEND
DESCRIPTION
PROPERTY LINE
EXISTING CONTOUR
PROPOSED CONTOUR
BASIN LIMITS
6" PVC DRAIN LINE &
LANDSCAPE DRAINS
DIRECTION OF FLOW
BROOKS BOX (OR SIM)
W/GRATE
BIOFIL TRA T/ON AREA
IMPERVIOUS AREA
PERVIOUS AREA
OMA ID--ID.31
SYMBOL
N45"45'45''W 1Ff!...-----
---9C ---
---90--------
SITE CHARACTER/ST/CS
• HYDROLOGJC SOIL GROUP ........... B
• APPROXIMATE DEPTH TO
GROUND WATER ................ .
• CRITICAL COARSE SEDIM
YIELD AREAS........... . .............. NONE
472
n5
Total (SF)
12,646
5,854
250
18,750
..___
'
Total (AC)
0.29
0.13
0.01
0.43
Percent
Impervious
--------~
-
' -----
' -------.......
..._ -----
------
------------
------..=--=---.,-
------
FROM IMP A
QMAX=1·22 (CFS ADAMS STREE VMAX=J.44 ~s ___ _
,roe 1 _ ----
TaTAL -MmcAT.£JJ.,--roTAL -uNMmcAr. D Q = 1.4.J;c,,CF'S QMAX=2.J5..; er.·,--.,__ ___ _
~ 11 F~ UAX =4.78 FPS
HYDROMODIFICA TION EXHIBIT B. I -PROPOSED CONDITIONS
~ COFFEY ENGINEERING, IN .
OMA
A.1.1 (Drains to
Tree Well)
A.1.2 (Drains to
Tree Well)
A.1.3 (Drains to
Tree Well)
Impervious/
Developed Area Pervious Pool/Water
(SF} Area (SF) Feature (SF)
1,465 1,643 257
3,278 1,643 215
2,515
Total
(SF}
3,365
5,136
2,515
Total Percent
(AC} Impervious -0.08 43.54%
0.12 63.82%
0.06 100.00%
SMA 1 {Self
rM_i_ti~ga_t_in=g_A_re_a~)~-----~-5~,_31_5~--~77~5~_6~,_090~_~0~.1~4~_~0~.W,~¼ -~
B.l (De Mini mus) 250 250 0.01 100.00°/o oRR~= l--_,;,_ ___ _;..1-... ___ _;.;;...;;..i_ ___ .,__ ___ _,1. _ _;;;,;;.;;.i._..;;,;.;;;,,;;;.i__.::.:,::.:.::,::_~.AOJACENT LOT
--
---
---
SEE CDP 2017-0061
LEGEND
SYMBOL
N45"45'45''W ·Ff..-----
-----------
........ _ ..,--........ ---
-
DESCRIPTION
PROPERTY LIN£
EXISTING CONTOUR
PROPOSED CONTOUR
BASIN LIMITS
---90----RU WALL AD,J'tor
---90---
6" PVC DRAIN LIN£ &
LANDSCAPE DRAINS
DIRECTION OF FLOW
BROOKS BOX (OR SIM)
W/GRATE
-----
IMPERVIOUS AREA
PERVIOUS AREA -
OMA ID---ID.31
SITE CHARACTERISTICS
•
•
•
HYDROLOGIC SOIL GROUP ........... B
APPROXIMATE DEPTH TO
GROUND WATER ........................ >6.5'
CRITICAL COARSE SEDIMENT
YIELD AREAS ............................. NONE
PUI SDRSD C----------------
-....._, __ __ ----
--
' -
-------
-------RU WALL ADJ LOT
PER SDRSD C-1
-----
20 o I 20 -w 60 --~----~----~1 ~~--~~~.· , S~LE1 1 "-20-' "-
I I '----
1 I
I I
I L 20' MIN. DIA
L CANOPY TREE
-(S. MAGNOLJA)
I
--
---~/
22' MIN. DIA. .,,,,
,, CANOPY TREE -
, -~WELL ..,,__.,
' (S. MAGNOLJA) ,,,
,)
-
~ COFFEY ENGINEERING, INC.
Appendix I: Forms and Checklists
Harvest and Use Feasibility Checklist Form 1-7
1. Is there a demand for harvested water ( check all that apply) at the project site that is reliably present during
the wet season?
el Toilet and urinal flushing
it) Landscape irrigation
D Other: _____ _
2. If there is a demand; estimate the anticipated average wet season demand over a period of 36 hours. Guidance
for planning level demand calculations for toilet/urinal flushing and landscape irrigation is provided in Section
B.3.2.
4 residents x 9.3 gallons/resident/day/ 7.48 gallons/cubic foot x 36 hours/
24hours/day = 7.46 cubic feet
3. Calculate the DCV using worksheet B.2-1.
DCV =387 (cubic feet)
3a. Is the 36 hour demand greater
than or equal to the DCV?
□ Yes / ~No ¢
~
Harvest and use appears to be
feasible. Conduct more detailed
evaluation and sizing calculations
to confirm that DCV can be used
at an adequate rate to meet
clrawdown criteria.
36. Is the 36 hour demand greater than
0.25DCV but less than the full DCV?
□ Yes / ,6 No c::>
-0-
Harvest and use may be feasible.
Conduct more detailed evaluation and
sizing calculations to determine
feasibility. Harvest and use may only be
able to be used for a portion of the site,
or (o ptionally) the storage may need to be
upsized to meet long term capture targets
while draining in longer than 36 hours.
Is harvest and use feasible based on further evaluation?
D Yes, refer to Appendix E to select and size harvest and use BMPs .
./J No, select alternate BMPs.
1-2
3c. Is the 36 hour demand
less than 0.25DCV?
t1' Yes
~
February 2016
Appendix I: Forms and Checklists
Categorization of Infiltration Feasibility Form 1-8
Condition
Part 1 -Full Infiltration Feasibility Screening Criteria
Would infiltration of the full design volume be feasible from a physical perspective without any undesirable
consequences that cannot be reasonably mitigated?
Criteria Screening Question
Is the estimated reliable infiltration rate below proposed
facility locations greater than 0.5 inches per hour? TI1e response
to this Screening Question shall be based on a comprehensive
evaluation of the factors presented in Appendix C.2 and Appendix
D.
Yes No
✓
The infiltration test results below the proposed facility location were 0.032 and 0.031 inches
per hour without a minimum factor of safety of 2 applied. Simple open pit testing was
performed at 2 locations on the site within or adjacent to the proposed infiltration basin in
accordance with Appendix D of the City of Carlsbad BMP design manual. In addition, a
comprehensive evaluation of the site was conducted in accordance with Appendix C.2.
Please refer to our "Report of Limited Geotechnical Investigation Proposed Storm Water
Infiltration BMPs" for details of the comprehensive evaluation and investigation conducted,
simple open pit test rates and simple open pit rate to infiltration rate calculations and maps
representative of the study.
2
Can infiltration greater than 0.5 inches per hour be allowed
without increasing risk of geotechnical hazards (slope stability,
groundwater mounding, utilities, or other factors) that cannot
be mitigated to an acceptable level? The response to this
Screening Question shall be based on a comprehensive evaluation of
the factors presented in Appendix C.2.
Provide basis:
✓
The infiltration test results below the proposed facility locations ranged from 0.032 to 0.031
inches per hour without a minimum safety factor of 2 applied. Based on the infiltration test
rate findings on the site, infiltration rates greater than 0.5 inches per hour were not
encountered. Therefore, a narrative discussion of the associated geotechnical hazards that
cannot be mitigated to an acceptable level are not applicable.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability.
1-3 February 2016
Appendix I: Forms and Checklists
Criteri
a
3
Form 1-8 Page 2 of 4
Screening Question
Can infiltration greater than 0.5 inches per hour be allowed
without increasing risk of groundwater contamination (shallow
water table, storm water pollutants or other factors) that cannot
be mitigated to an acceptable level? The response to this
Screening Question shall be based on a comprehensive evaluation of
the factors presented in Appendix C.3.
Provide basis:
Yes No
✓
The infiltration test results below the proposed facility locations ranged from 0.032 to 0.031
inches per hour without a minimum safety factor of 2 applied. Based on the infiltration test
rate findings on the site, infiltration rates greater than 0.5 inches per hour were not
encountered. Therefore, a narrative discussion of the associated risk of groundwater
contamination that cannot be mitigated to an acceptable level are not applicable.
Summarize findings of studies; provide reference to sturues, calculations, maps, d ata sources, etc. Provide narrative
ru scussion of study/ data source applicability.
4
Can infiltration greater than 0.5 inches per hour be allowed
without causing potential water balance issues such as change
of seasonality of ephemeral streams or increased discharge of
contaminated groundwater to surface waters? The response to
this Screening Question shall be based on a comprehensive
evaluation of the factors presented in Appendix C.3.
Provide basis:
✓
Measured infiltration rates on the site were less than 0.5 inches per hour.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability.
Part 1
Result
*
If all answers to rows 1 -4 are ''Yes" a full in filtration design is potentially feasi ble.
The feasibility screening category is Full Infiltration
If any answer from row 1-4 is "No", infiltration may be possible to some extent but
would not generally be feasible or desirable to achieve a "full infiltration" design.
Proceed to Part 2
No full
infiltration
*To be completed using gathered site information and best professional judgment considering the definition of MEP in
the MS4 Permit. Adrutional testing and/ or studies may be reguired by the City to substantiate findings.
I-4 February 2016
Appendix I: Forms and Checklists
Form 1-8 Page 3 of 4
Part 2 -Partial Infiltration vs. No Infiltration Feasibility Screening Criteria
Would infiltration of water in any appreciable amount be physically feasible without any negative
consequences that cannot be reasonably mitigated?
Criteria
5
Screening Question
Do soil and geologic conditions allow for infiltration in any
appreciable rate or volume? The response to this Screening
Question shall be based on a comprehensive evaluation of the
factors presented in Appendix C.2 and Appendix D.
Yes No
✓
The city of Carlsbad BMP Design Manual, Appendix C and Appendix D, do not provide
values considered for appreciable rates. Although we do not consider the measured
infiltration rates as appreciable from a practical standpoint, we answered yes to this
screening question. Based on our infiltration test rates and limited geotechnical investigation
of the site, it is our opinion that the soil and geologic conditions allow for the very little
appreciable infiltration rates. Please refer to our "Report of Limited Geotechnical Investigation
Proposed Storm Water Infiltration BMPs" for details of the comprehensive evaluation and
investigation conducted , simple open pit test rates and simple open pit rate to infiltration rate
calculations and maps representative of the study.
6
Can Infiltration in any appreciable quantity be allowed
without increasing risk of geotechnical hazards (slope
stability, groundwater mounding, utilities, or other factors)
that cannot be mitigated to an acceptable level? The response
to this Screening Question shall be based on a comprehensive
evaluation of the factors presented in Appendix C.2.
Provide basis:
✓
In our opinion, any long term very partial infiltration at the site will not result in
geotechnical hazards which cannot be reasonably mitigated to an acceptable level.
Please refer to our "Report of Limited Geotechnical Investigation Proposed Storm
Water Infiltration BMPs" for details of the comprehensive evaluation and investigation
conducted, simple open pit test rates and simple open pit rate to infiltration rate
calculations and maps representative of the study.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates.
I-5 February 2016
Appendix I: Forms and Checklists
Criteria
7
Form 1-8 Page 4 of 4
Screening Question
Can Infiltration in any appreciable quantity be allowed
without posing significant risk for groundwater related
concerns (shallow water table, storm water pollutants or other
factors)? The response to this Screening Question shall be based
on a comprehensive evaluation of the factors presented in
Appendix C.3.
Provide basis:
Yes No
✓
In our opinion, any long term very partial infiltration at the site will not result in a
significant risk for groundwater related concerns. Please refer to our "Report of
Limited Geotechnical Investigation Proposed Storm Water Infiltration BMPs" for
details of the comprehensive evaluation and investigation conducted, simple open pit
test rates and simple open pit rate to infiltration rate calculations and maps
representative of the study.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates.
8
Can infiltration be allowed without violating downstream
water rights? The response to this Screening Question shall be
based on a comprehensive evaluation of the factors presented in
Appendix C.3.
Provide basis:
✓
The infiltration of storm water in the expected low rates is not anticipated to violate
any downstream water rights.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates.
Part 2
Result*
If all answers from row 5-8 are yes then partial infiltration design is potentially feasible.
T he feasibility screening category is Partial Infiltration.
If any answer from row 5-8 is no, then infiltration of any volume is considered to be
infeasible within the drainage area. The feasibility screening category is No Infiltration.
Partial
Infiltration
*To be completed using gathered site information and best professional judgment considering the definition of MEP in
the MS4 Permit. Additional testing and/ or studies may be required by the City to substantiate findings.
I-6 February 2016
Appendix E: BMP Design Fact Sheets
If These Sources Will Be
on the Project Site · · · ... Then Your Project Shall Consider These Source Control BMPs
1
Potential Sources of
Runoff Pollutants
2
Permanent Controls-Show on
Drawings
ii A. Onsite storm drain 0 Locations of inlets.
inlets
0 Not Applicable
3
Permanent Controls-List in Table
and Narrative
4
Operational BMPs-Include in
Table and Narrative
'21' Mark all inlets with the words "No r;J Maintain and periodically repaint
Dumping! Flows to Bay" or similar. or replace inlet markings.
E-3
~ Provide storm water pollution
prevention information to new
site owners, lessees, or operators.
~ See applicable operational BMPs
in Fact Sheet SC-44, "Drainage
System Maintenance," m the
CASQA Stormwater Quality
Handbooks at
www.cabmphandbooks.com.
~ Include the following m 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."
February 2016
Appendix E: BMP Design Fact Sheets
If These Sources Will Be
on the Project Site · · · ... Then Your Project shall consider These Source Control BMPs
1
Potential Sources of
Runoff Pollutants
□ B. Interior floor drains
and elevator shaft
sump pumps
~ Not Applicable
□ C. Interior parking
garages
~ Not Applicable
□ D1. Need for future
indoor & structural
pest control
0 Not Applicable
2
Permanent Controls-Show on
Drawings
3
Permanent Controls-List in Table
and Narrative
□ State that interior floor drains and
elevator shaft sump pumps will be
plumbed to sanitary sewer.
□ State that parking garage floor
drains will be plumbed to the
sanitary sewer or an approved BMP
□ Note building design features that
discourage entry of pests.
E-4
4
Operational BMPs-Include in
Table and Narrative
□ Inspect and maintain drains to
prevent blockages and overflow.
□ Inspect and maintain drains to
prevent blockages and overflow.
□ Provide Integrated Pest
Management information to
owners, lessees, and operators.
February 2016
Appendix E: BMP Design Fact Sheets
If These Somces Will Be
on the Project Site · · · ... Then Your Project shall consider These Source Control BMPs
1
Potential Sources of
Runoff Pollutants
~ D2. Landscape/
Outdoor Pesticide
Use
D Not Applicable
2
Permanent Controls-Show on
Drawings
~ Show locations of existing
trees or areas of shrubs and
ground cover to be
undisturbed and retained.
□ Show self-retaining landscape
areas, if any.
.a' Show storm water treatment
facilities.
3
Permanent Controls-List in Table
and Narrative
State that final landscape plans will
accomplish all of the following.
-1' Preserve existing drought tolerant trees,
shrubs, and ground cover to the
maximum extent possible.
¢ Design landscaping to rrurum1ze
irrigation and runoff, to promote
surface infiltration where appropriate,
and to minimize the use of fertilizers
and pesticides that can contribute to
storm water pollution.
-1' Where landscaped areas are used to
retain or 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, au movement, ecological
consistency, and plant interactions.
E-5
4
Operational BMPs-Include in
Table and Narrative
r;t Maintain lan dscaping using
minimum or no pesticides.
~ See applicable operational
BMPs in Fact Sheet SC-41,
"Building and Grounds
Maintenance," in the CASQA
Stormwater Quality Handbooks
at www.cabmphandbooks.com.
ij{' Provide IPM information to
new owners, lessees and
operators.
February 2016
Appendix E: BMP Design Fact Sheets ,
If These Sources Will Be
on the Project Site ··· ... Then Your Project shall consider These Source Control BMPs
1
Potential Sources of
Runoff Pollutants
~ E. Pools, spas, ponds,
decorative fountains,
and other water
features.
0 Not Applicable
□ F. Food service
~ Not Applicable
2
Permanent Controls-Show on
Drawings
~ Show location of water feature
and a sanitary sewer cleanout in
an accessible area within 10 feet.
□ For restaurants, grocery stores,
and other food service
operations, show location
(indoors or in a covered area
outdoors) of a floor sink or other
area for cleaning floor mats,
containers, and equipment.
□ On the drawing, show a note that
this drain will be connected to a
grease interceptor before
discharging to the sanitary sewer.
3
Permanent Controls-Listin Table
and Narrative
i Pool backwash to be plumbed to the
sanitary sewer. Place a note on the
plans and state in the narrative that
this connection will be made
according to city requirements.
□ Describe the location and features of
the designated cleaning area.
□ D escribe the items to be cleaned in
this facility and how it has been sized
to ensure that the largest items can be
accommodated.
E-6
4
Operational BMPs-Include
in
Table and Narrative
i!f See applicable operational
BMPs in Fact Sheet SC-72,
"Fountain and Pool
Maintenance," in the CASQA
Stormwater Quality
Handbooks at
www.cabmphandbooks.com.
February 2016
Appendix E: BMP Design Fact Sheets
If These Sources Will Be
on the Project Site · · · ... Then Your Project shall consider These Source Control BMPs
1
Potential Sources of
Runoff Pollutants
□ G. Refuse areas
~ Not Applicable
2
Permanent Controls-Show on
Drawings
□ Show where site refuse and
recycled materials will be
handled and stored for pickup.
□ If dumpsters or other receptacles
are outdoors, show how the
designated area will be covered,
graded, and paved to prevent
run-on and show locations of
berms to prevent runoff from
the area. Also show how the
designated area will be protected
from wind dispersal.
□ Any drains from dumpsters,
compactors, and tallow bin areas
shall be discharged to an
approved BMP.
□ Refer to City Standard D rawing
GS-16 for details.
3
Permanent Controls-List in T able
and N arrative
□ State how site refuse will be
handled and provide supporting
detail to what is shown on plans.
□ State that signs will be posted on
or near dumpsters with the words
"Do not dump hazardous
materials here" or similar.
E -7
4
Operational BMPs-Include in
Table and Narrative
□ State how the following will be
implemented:
Provide adequate number of
receptacles. Inspect receptacles
regularly; repair or replace leaky
receptacles. Keep receptacles
covered. Prohibit/prevent
dumping of liquid or hazardous
wastes. Post "no hazardous
materials" signs. Inspect and pick
up litter daily and clean up spills
immediately. Keep spill control
materials available on-site. See
Fact Sheet SC-34, ''Waste
Handling and D isposal" in the
CASQA Stormwater Quality
Handbooks at
www.cabmphandbooks.com.
February 2016
Appendix E: BMP Design Fact Sheets
If These Sources Will Be . .
1 P . s· ... Then Your ProJect shall consider These Source Control BMPs on t le tOJCCt ttc ...
1
Potential Sources of
Runoff Pollutants
□ H. Industrial
processes.
ii Not Applicable
□ I. Outdoor storage of
equipment or
materials. (See rows J
and K for source
control measures for
vehicle cleaning,
repair, and
maintenance.)
i1 Not Applicable
2
Permanent Controls-Show on
Drawings
□ Show process area.
□
□
Show any outdoor storage
areas, including how materials
will be covered. Show how
areas will be graded and
bermed to prevent run-on or
runoff from area and protected
from wind dispersal.
Storage of non-hazardous
liquids shall be covered by a
roof and/ or drain to the
sanitary sewer system, and be
contained by berms, dikes,
liners, or vaults.
□ Storage of hazardous materials
and wastes must be in
compliance with the city's
hazardous materials ordinance
and a Hazardous Materials
Management Plan for the site.
3
Permanent Controls-List in T able and
Narrative
□ If industrial processes are to be located
onsite, state: "All process activities to be
performed indoors. No processes to
drain to exterior or to storm drain
system."
□ Include a detailed description of
materials to be stored, storage areas, and
structural features to prevent pollutants
from entering storm drains.
Where appropriate, reference
documentation of compliance with the
requirements of local Hazardous
Materials Programs for:
• Hazardous Waste Generation
• Hazardous Materials Release
Response and Inventory
• California Accidental Release
Prevention Program
• Aboveground Storage Tank
• Uniform Fire Code Article 80
Section 103(6) & (c) 1991
• Underground Storage Tank
E-8
4
Operational BMPs-Include
in Table and Narrative
Table and Narrative
□ See Fact Sheet SC-10, "Non-
Stormwater Discharges" in the
CASQA Stormwater Quality
Handbooks at
www.cabmphandbooks.com.
□ See the Fact Sheets SC-31,
"Outdoor Liquid Container
Storage" and SC-33, "Outdoor
Storage of Raw Materials" in
the CASQA Stormwater
Quality Handbooks at
www.cabmphandbooks.com.
February 2016
Appendix E: BMP Design Fact Sheets
If These Sources Will Be .
1 P . s· ... Then Your Proiect shall consider These Source Control BMPs on t 1e rOJCCt tte ...
1
Potential Sources of
Runoff Pollutants
□ J. Vehicle and
Equipment Cleaning
D Not Applicable
2
Permanent Controls-Show on Drawings
□ Show on drawings as appropriate:
(1) Commercial/industrial facilities having
vehicle / equipment cleaning needs shall either
provide a covered, bermed area for washing
activities or discourage vehicle/ equipment
washing by removing hose bibs and installing
signs prohibiting such uses.
(2) Commercial car wash facilities shall be
designed such that no runoff from the fa cility
1s dis charged to the storm drain system.
Wastewater from the facility shall discharge to
the sanitary sewer, or a wastewater reclamation
system shall be installed.
E -9
3
Permanent Controls-List in
T able and Narrative
□ If a car wash area 1s not
provided, describe measures
taken to discourage onsite
car washing and explain how
these will be enforced.
4
Operational BMPs-Include in
T able and Narrative
Describe operational measures to
implement the following (if
applicable):
□ Washwater from vehicle and
equipment washing operations
shall not be discharged to the
storm drain system.
□ Car dealerships and similar
may rinse cars with water only.
□ See Fact Sheet SC-21, "Vehicle
and Equipment Cleaning," in
the CASQA Stormwater
Quality Handbooks at
www.cabmphandbooks.com
February 2016
Appendix E: BMP Design Fact Sheets •
If These Sources Will Be . .
h P . s· ... Then Your Pro1ect shall consider These Source Control BMPs on t e roJect 1te ...
1
Potential Sources of
Runoff Pollutants
□ K.
Vehicle/Equipment
Repair and
Maintenance
ti Not Applicable
□
□
□
2
Permanent Controls-Show on
Drawings
Accommodate all vehicle
equipment reprur and
maintenance indoors or designate
an outdoor work area and design
the area to protect from rainfall,
run-on runoff, and wind dispersal.
Show secondary containment for
exterior work areas where motor
oil, brake fluid, gasoline, diesel
fuel, radiator fluid, acid-
containing batteries or other
hazardous materials or hazardous
wastes are used or stored. Drains
shall not be installed within the
secondary containment areas.
Add a note on the plans that states
either (1) there are no floor drains,
or (2) floor drains are connected
to wastewater pretreatment
systems prior to dis charge to the
sanitary sewer and an industrial
waste discharge permit will be
obtained.
3
Permanent Controls-List in
Table and Narrative
□
□
□
State that no vehicle repair or
maintenance will be done
outdoors, or else describe the
required features of the
outdoor work area.
State that there are no floor
drains or if there are floor
drains, note the city from
which an industrial waste
discharge permit will be
obtained and that the design
meets city's requirements.
State that there are no tanks,
containers or sinks to be used
for parts cleaning or rinsing
or, if there are, note the city
from which an industrial
waste discharge permit will be
obtained and that the design
meets city's requirements.
E -10
4
Operational BMPs-Include in
Table and Narrative
In the report, note that all of the following
restrictions apply to use the site:
□ No person shall dispose of, nor permit
the disposal, directly or indirectly of
vehicle fluids, hazardous materials, or
rinsewater from parts cleaning into
storm drains.
□ No vehicle fluid removal shall be
performed outside a building, nor on
asphalt or ground surfaces, whether
inside or outside a building, except in
such a manner as to ensure that any
spilled fluid will be rn an area of
secondary containment. Leaking
vehicle fluids shall be contained or
drained from the vehicle immediately.
□ No person shall leave unattended drip
parts or other open containers
containing vehicle fluid, unless such
containers are in use or in an area of
secondary containment.
February 2016
Appendix E: BMP Design Fact Sheets
If These Sources Will Be . .
1 P . s· ... Then Your ProJect shall consider These Source Control BMPs on t lC rOJCCt Ite ...
1
Potential Sources of
Runoff Pollutants
□ L. Fuel Dispensing
Areas
0 Not Applicable
2
Permanent Controls-Show on
Drawings
□ Fueling areas1 shall have
impermeable floors (i.e., portland
cement concrete or equivalent
smooth impervious surface) that
are (1) graded at the minimum
slope necessary to prevent
ponding; and (2) separated from
the rest of the site by a grade break
that prevents run-on of storm
water to the MEP.
□ Fueling areas shall be covered by a
canopy that extends a minimum of
ten feet in each direction from each
pump. [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 1 .] The canopy [ or
cover] shall not drain onto the
fueling area.
3
Permanent Controls-List in
Table and N arrative
4
Operational BMPs-Include in
Table and Narrative
□ The property owner shall dry sweep
the fueling area routinely.
□ See the Business Guide Sheet,
"Automotive Service-Service
Stations" in the CASQA Stormwater
Quality Handbooks at
www.cabmphandbooks.com.
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 which the hose
and nozzle assembly may be operated plus a minimum of one foot, whichever is greater.
E -11 February 2016
Appendix E: BMP Design Fact Sheets
If These Sources Will Be . .
l P . s· ... Then Your Proiect shall consider These Source Control BMPs on t 1e roiect tte ...
1
Potential Sources of
Runoff Pollutants
M. Loading D ocks
,z'.l Not Applicable
2
Permanent Controls-Show on
Drawings
□ Show a preliminary design for the
loading dock area, including
roofing and drainage. Loading
docks shall be covered and/ or
graded to minimize run-on to and
runoff from the loading area. Roof
downspouts shall be positioned to
direct storm water away from the
loading area. Water from loading
dock areas should be drained to an
approved BMP. Direct
connections to storm drains from
depressed loading docks are
prohibited.
□ Loading dock shall be equipped
with a spill control valve or
equivalent device, which shall be
kept closed during periods of
operation.
□ Provide a roof overhang over the
loading area or install door skirts
( cowling) at each bay that enclose
the end of the trailer.
3
Permanent Controls-List in
Table and Narrative
E-12
4
Operational BMPs-Include in
Table and Narrative
□ Move loaded and unloaded items
indoors as soon as possible.
□ See Fact Sheet SC-30, "Outdoor
Loading and Unloading," m the
CASQA Stormwater Quality
Handbooks at
www.cabmphandbooks.com.
February 2016
Appendix E: BMP Design Fact Sheets
If These Sources Will Be . .
l P . s· ... Then Your Proiect shall consider These Source Control BMPs on t 1e roiect lte ...
1
Potential Sources of
Runoff Pollutants
,zl N. Fire Sprinkler
Test Water
D Not Applicable
0. Miscellaneous Drain or
Wash Water
□ Boiler drain lines
,zl Condensate drain
lines
□ Rooftop
equipment
□ Drainage sumps
0 Roofing, gutters,
and trim
D Not Applicable
2
Permanent Controls-
Show on Drawings
3
Permanent Controls-List in Table and
Narrative
Provide a means to drain fire sprinkler test water
to the sanitary sewer or approved BMP.
□ Boiler drain lines shall be directly or indirectly
connected to the sanitary sewer system and may
not discharge to the storm drain system.
ti Condensate drain lines may discharge to
landscaped areas if the flow is small enough that
runoff will not occur. Condensate drain lines may
not discharge to the storm drain system.
□ Rooftop mounted equipment with potential to
produce pollutants shall be roofed and/ or have
secondary containment.
□ Any drainage sumps onsite shall feature a
sediment sump to reduce the quantity of sediment
in pumped water.
t1' Avoid roofing, gutters, and trim made of copper
or other unprotected metals that may leach into
runoff.
E-13
4
Operational BMPs-Include in
Table and Narrative
~ See the note in Fact Sheet SC-
41, "Building and Grounds
Maintenance," in the CASQA
Stormwater Quality
Handbooks at
www.cabmphandbooks.com.
February 2016
Appendix E: BMP Design Fact Sheets '
If These Sources Will Be . .
1 P . s· ... Then Your Proiect shall consider These Source Control BMPs on t 1e rOJCCt Itc ...
1
Potential Sources of
Runoff Pollutants
~ P. Plazas, sidewalks,
and parking lots.
D Not Applicable
2
Permanent Controls-Show on
Drawings
3
Permanent Controls-List in
Table and Narrative
E-14
4
Operational BMPs-Include in
Table and Narrative
~ Plazas, sidewalks, and parking lots shall
be swept regularly to prevent the
accumulation of litter and debris.
Debris from pressure washing shall be
collected to prevent entry into the storm
drain system. Washwater containing any
cleaning agent or degreaser shall be
collected and discharged to the sanitary
sewer and not discharged to a storm
drain.
February 2016
San Diego County
85 th Percentile lsopluvials
NOil n.tl!M----••N,_,,...,...., .............. --....,~---~,_.,__,.,,,.. __ ........ .,.... ........
N + ~ -
Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods
Figure B.1-1: 85th Percentile 24-hour Isopluvial Map
rainage Management Area
Concrete or Ashpha
Amended, Mulched Sot 4,680
Total 11,938
Weighted Runof Factor 0.660
1 85th Percentile 24-hr storm depth from Figure b. 0.59 inches
2 Area tributary to BMP (s) 0.274 acres
Area weighted runoff factor (estimate using
3 Appendix B.1.1 and B.2.1 0.66 unitless
4 Street trees volume reduction 0.000 cubic-feet
5 Rain barrels volume reduction RCV = 0.000 cubic-feet
6 Calculated DCV = (3630 x C x d x A) -T DCV= 387.305 cubic-feet
Page 1 of 3
1
Allowable draw wn time for aggregate storage
3 below underdrain
Depth of runoff that c be infiltrated [Line 2 x Line
4 3)
5 Aggregate pore space
Required depth of gravel bel the underdrain [Line
6 4 / Line 5)
7
8 Media retained pore space
Volume retained by BMP [[Line 4 + (Line I
9 8))/12) x Line 7
10 DCV that requires biofiltration [Line 1 -Line
BMP Parameters
Surface Ponding [6 inches minimum, 12 ·
11 maximum]
12 Media Thickness [18 inches minim
Aggregate Storage above und arain invert (12 13 inches typical) -use O inche or sizing if the
aggegate is not over the tire bottom surface area
Baseline Calculations
Depth of D ention Storage [Line 11+ (Line 12 x Line
18 14) + (Lin 13 x Line 5))
Page 2 of 3
387.31
0.01 in/ hr
36 hours
inches
in/ in
inches
237 sq-ft
0.1 in/ in
42.66 cubic-feet
344.65 cubic-feet
10 inches
inches
10 inches
0.2 in/ in
5 in/ hr
6
30
17.60
47.6
516.97
130.33
Required Storage urface + pores) Volume [0.75 x
22 Line 10] cubic-feet
23 Required Footprint [Line sq-ft
Footprint of the BMP
24 Area draining to the BMP sq-ft
Adjusted Runoff Factor for drainage ar
25 Appendix B.1 and B.2) 0.660
minimum footprint sizing factor from W
26 B.5-2, Line 11)
27 sq -ft
Footprint of the BM -Maximum(Minimum(Line
28 21, Line 23), Lin 6) 236.37
Page 3 of 3
Category #
1111
2 ■ I 3
Standard I 4
Drainage Basin I 5
Inputs I 6
I I ..
Bl Ill ..
7
8
9
D . . Ill
14 1spers10n Ill
Area, Tree \~'ell -
& Rain Barrel Ill
Inputs
(Optional) Ill .. ..
El ltDI 1111
Initial Runoff Bl
Factor El
Calculation I
Bl ..
IIBII Dispersion .:ffllll 29 Area -.a:'1111
Adjustments I 30
31
I 32
Tree & Barrel I 33
Adjustments I 34
Results
I 35
36 El llil El
Automated Worksheet B.1: Calculation of Design Capture Volume (V2.0)
Description
Drainage Basin ID or arne
85th Percentile 24-hr Storm Depth 1.18 1.18
Impervious Surfaces ot Directed to Dispersion Area (C=0.90) 1,465 3,278 2,515
Semi-Pervious Surfaces ot Serving as Dispersion Area (C=0.30)
Engineered Pervious Surfaces Not Serving as Dispersion Area (C=0.10)
Natural Type A Soil Not Serving as Dispersion Area (C=0.10)
atural Type B Soil 1 ot Serving as Dispersion Area (C=0.14) 1,643 1,643
atural Type C Soil ot Serving as Dispersion Area (C=0.23)
atural Type D Soil 1 ot Serving as Dispersion Area (C=0.30)
Does Tributary Incorporate Dispersion, Tree Wells, and/or Rain Barrels. Yes Yes Yes
Impervious Surfaces Directed to Dispersion Area per SD-B (Ci=0.90)
Serni-Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.30)
Engineered Pervious Surfaces Serving as Dispersion Area per SD-B (Ci =0.10)
atural Type A Soil Serving as Dispersion Area per SD-B (Ci=0.10)
atural Type B Soil Serving as Dispersion Area per SD-B (Ci=0.14)
atural Type C Soil Serving as Dispersion Area per SD-B (Ci=0.23)
Natural Natural Type D Soil Serving as Dispersion Area per SD-B (Ci=0.30)
umber of Tree Wells Proposed per SD-A 1 1 1
Average Mature Tree Canopy Diameter 20 27 22
Nwnber of Rain B wnber of Rain Barrels Proposed per SD-E
Average Rain Barrel Size
Total Tributary Area 3,108 4,921 2,515 0 0
Initial Runoff Factor for St Initial Runoff Factor for Standard Drainage Areas 0.50 0.65 0.90 0.00 0.00
Initial Runoff Factor fo Initial Runoff Factor for Dispersed & Dispersion Areas 0.00 0.00 0.00 0.00 0.00
Initial Weighted Runoff Factor 0.50 0.65 0.90 0.00 0.00
Initial Design Capture Volume 153 315 223 0 0
Total Impervious Are Total Impervious Area Dispersed to Pervious Surface 0 0 0 0 0
Total Penrious Dispersion Area 0 0 0 0 0
Ratio of Dispersed Impervious Area to Pervious Dispersion Are n/a n /a n/a n/a n/a
Adjustment Factor for Dispersed & Dispersion Areas 1.00 1.00 1.00 1.00 1.00
Runoff Factor After Dispersion Techniques 0.50 0.65 0.90 n/a n/a
Design Capture Volume After Dispersion Techniques 153 315 223 0 0
Total Tree Well Volume Reduction 180 342 224 0 0
Total Rain Barrel Volume Reduction 0 0 0 0 0
Final Adjusted Runoff Factor 0.00 0.00 0.00 0.00 0.00
Final Effective Tributary Area 0 0 0 0 0
Initial Design Capture Volume Retained by Site Design Elements 180 342 224 0 0
Final Design Capture Volume Tributary to BMP 0 0 0 0 0
rm Units
inches
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
yes/no
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
#
ft
#
gal
0 0 0 0 0 sq-fr
0.00 0.00 0.00 0.00 0.00 unitless
0.00 0.00 0.00 0.00 0.00 unitless
0.00 0.00 0.00 0.00 0.00 unitless
0 0 0 0 0 cubic-feet
0 0 0 0 0 sq-ft
0 0 0 0 0 sq-ft
n/a n/a n/a n/a n/a ratio
1.00 1.00 1.00 1.00 1.00 ratio
n/a n/a n/a n/a n /a unitless
0 0 0 0 0 cubic-feet
0 0 0 0 0 cubic-feet
0 0 0 0 0 cubic-feet
0.00 0.00 0.00 0.00 0.00 unitless
0 0 0 0 0 sq-ft
0 0 0 0 0 cubic-feet
0 0 0 0 0 cubic-feet
ATTACHMENT 2
BACKUP FOR PDP HYDROMODIFICATION CONTROL MEASURES
[This is the cover sheet for Attachment 2.]
Indicate which Items are Included behind this cover sheet:
Attachment Contents Checklist
Sequence
Attachment 2a Hydromodification Management ii Included
Exhibit (Required)
See Hydromodification Management
Exhibit Checklist on the back of this
Attachment cover sheet.
Attachment 2b Management of Critical Coarse ii Exhibit showing project drainage
Sediment Yield Areas (WMAA Exhibit boundaries marked on WMAA
is required, additional analyses are 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
□ 6.2.1 Verification of Geomorphic
Landscape Units Onsite
D 6.2.2 Downstream Systems
Sensitivity to Coarse Sediment
□ 6.2.3 Optional Additional Analysis
of Potential Critical Coarse
Sediment Yield Areas Onsite
Attachment 2c Geomorphic Assessment of Receiving t:J Not performed
Channels (Optional) □ Included
See Section 6.3.4 of the BMP Design
Manual.
Attachment 2d Flow Control Facility Design and ii Included
Structural BMP Drawdown
Calculations (Required)
See Chapter 6 and Appendix G of the
BMP Desian Manual
Use this checklist to ensure the required information has been included on the
Hydromodification Management Exhibit:
The Hydromodification Management Exhibit must identify:
i Underlying hydrologic soil group i Approximate depth to groundwater
~Existing natural hydrologic features ( watercourses, seeps, springs, wetlands)
~ Critical coarse sediment yield areas to be protected (if present) i Existing topography i Existing and proposed site drainage network and connections to drainage off site i Proposed grading i Proposed impervious features i Proposed design features and surface treatments used to minimize imperviousness
i Point(s) of Compliance (POC) for Hydromodification Management
i Existing and proposed drainage boundary and drainage area to each POC (when necessary,
create separate exhibits for pre-development and post-project conditions) i Structural BMPs for hydromodification management (identify location, type of BMP, and
size/detail)
LEGEND
DESCRIPTION
PROPERTY LINE
EXISTING CONTOUR
BASIN LIMITS
DIRECTION OF FLOW
SYMBOL
N45"45'45''W ·Fr.-----
OMA ID---lx ,1
Impervious/
Developed Pervious
~ 0 -----BO
SCALE: 1 "=40'
OMA Area (SF) Area (SF} Total (SF) Total (AC)
Percent
Impervious
Y.1-Offsite
Tributary Area
X.l 18,614
20,610
18,614
0.47
0.43 0.00%
HYDROMODIFICA TION EXHIBIT A. l -EXISTING CONDITIONS
120
j
~ COFFEY ENGINEERING, INC.
Impervious/
Developed Area Pervious Biofiltration
DMA (SF) Area (SF) Area (SF)
Pool/Water
Feature (SF)
A.1 (Drains to
Biofiltration)
SMA 1 (Self
Mitigating Area)
B.1 (De
Minimus)
Total
Developed
4,680 236
250
7,508 9,759
LEGEND
DESCRIPTION
PROPERTY LIN£
EXISTING CONTOUR
PROPOSED CONTOUR
BASIN LIMITS
6" PVC DRAIN LIN£ &
LANDSCAPE DRAINS
DIRECTION OF FLOW
BROOKS BOX (OR SIM)
W/GRAT£
8/0FIL TRA TION AREA
IMPERVIOUS AREA
PERVIOUS AREA
DMA 10--10.31
SYMBOL
N45.45'45"W ·Fr.-----
---90---
---90--------
[ :
SITE CHARACTER/ST/CS
• HYDROLOG/C SOIL GROUP ........... B
• APPROX/MAT£ DEPTH TO
GROUND WATER.................... . 6.5'
• CRITICAL COARSE S£D/M£
YIELD AREAS.............. . ........... NON£
472
775
Total (SF) Total {AC)
Percent
Impervious
12,646 0.29
5,854 0.13
250 0.01
18,750 0.43
'--....... ---___ _..---.. -.__
-
......... .__ ----
......... --------.........
....._ __ ---.........
.__ -----
.... '---------
-------
-----------
:----_ ~--,c --FROM IMP A-:"
Qw.x=1.22 ;cFs ADAMS STREE VMAX=3. 44 ff!:_S ___ _
Pc -----) TCJTAL-MITIGAT£D,--,OTAL-UNMITIGAT£D
"' QiJAx=1.4;J._cF's Qw.x=2-61-er·......-'----
PAVIHG ~ 11 F!§-· ~4. 78 FPS -------
I
I
I --
L ___ '
---/
' ,./ /
HYDROMODIFICA TION EXHIBIT B. 1 -PROPOSED CONDITIONS
~ COFFEY ENGINEERING, IN .
..
OMA
A.1.1 (Drains to
Tree Well)
A.1.2 (Drains to
Tree Well)
A.1.3 (Drains to
Tree Well )
SMA 1 (Self
Mit igating Area)
Impervious/
Developed Area Pervious Pool/Water
{SF) Area (SF) Feature (SF)
1,465 1,643 257
3,278 1,643 215
2,515
Total
(SF)
3,365
5,136
2,515
5,315 775 6,090
Total Percent
(AC) Impervious "-::: -'--0.08 43.54% ---
0.12 63.82% -'----0.06 100.00% --
0.14 0.00°/o -------
( OR PROPOSED B.1 De Min imus) 250 250 0.01 100.00°/o M'ROVEMENTs ______ ....._ ____ ........._ ___ ......._ ___ ........., __ ........., __ --i.., ____ ___.ADJACENT LOT
LEGEN D
DESCRIPTION
PROPERTY LINE
EXISTING CONTOUR
PROPOSED CONTOUR
BASIN LIMITS
6" PVC DRAIN LINE &
LANDSCAPE DRAINS
DIRECTION OF FLOW
BROOKS BOX (OR SIM)
W/GRATE
IMPERVIOUS AREA
PERVIOUS AREA
OMA 10--10.31
SYMBOL
N45"45'45"W ·Fr.-----
90---
---90 --------
SITE CHARACTERISTICS
•
•
•
HYDROLOGIC SOIL GROUP ........... B
APPROXIMATE DEPTH TO
GROUND WATER ........................ >6.5'
CRITICAL COARSE SEDIMENT
YIELD AREAS ............................. NONE
-
-------
SEE CQ!'._ 2017-0081
,,.-----------REI WALL ADJ 1:oI _
P[R SDRSD C-2'-. --
---------
.......... __ __
------
-------------
----
----
-----REI WALL ADJ LOT
PER SORSO C-I
---
'---------~~
27' MIN. DIA.
CANOPY TREE WELL
(SWEET GUM) I
20 o I 20 '4(J 60 -~-~---~---~1 --~--~--~' S~LE11 ·-20-.· '--
I I "---
I I
I I
: L 20' MIN. DIA.
L CANOPY TREE
-(S. MAGNOLIA)
J
------'--~ / ' -........ ~
22' MIN. DIA. _,,
./ CANOPY TREE __.
, ---..;WEU ,..,...,,..
. ----,., (S. MAGNOLIA) :_,, ·
-----/
?Al!'.,---·~~,..~~:;;.;~-:-~ ADAMS s Qw.x=2 33 CFS ""' ~-----,,.,... ___ _ TiE----T vw.x=1:10 FPS
:.--ffOC 1 ------EX. 00 -TQTAL -MITIGA~ 1DTAL-UNMITIGA 7JED (APPRX. wc.J p~ -------
QAki! = 1. s Qw.x= 2.-&-1-ers
V.,~-. 11°mFPS-----I.W<=4. 78 FPS
-r ------
-
HYDROMODIFICA TION EXHIBIT 8 . l -PROPOSED CONDITIONS
~ COFFEY ENGINEERI N G, INC.
A
L
CONCRETE TREE
GRATE FRAME
PER SORSO L -4
SEE DWG GS-1.10
FOR SUBSURFACE
DRAINAGE REQUIREMENTS
PLAN VIEW
5'x5' TREE GRATE
J" 7YPE 1
MULCH
SECTION A-A
DETAIL 'F' -TREE WELL (SD-A}
NO SCALE
DEEP ROOT
TREE BUBBLER
PER SORSO 1-4
OVERFLOW A
~UTLET PIPE •
1 ~ER PLAN __j
-=---c1-+---=FREE-
TRUNK
30 MIL PLASTIC
LINER WITH ROOT CONTROL
BARRIER PER SDRSD L -4 &
L-6
6" MIN.
EMBEDMENT
30 MIL PLASTIC LINER WITH
OOT CONTROL BARRIER
PER SDRSD L -4 & L -6
STRUCTURAL SOIL
DEEP ROOT
TREE BUBBLER
PER SDRSD DWG /-4
KLOVANISH RESIDENCE
HYDROMODIFICATION EXHIBIT B.2 (DETAILS)
~ COFFEY ENGINEERING, INC.
Klovanish Residence -Critical Coarse Sediment Yield Area Map
Category
Standard
#
1111
2 ..
I I
3
4
Drainage Basin I 5
Inputs I 6
I I ..
IDI Ill ..
7
8
9
D. -Ill 1spers10n Ill
Area, Tree Well Ill
& Rain Barrel ..
Inputs
15
16
(Optional) lfl .. ..
Ell ..
El
Initial Runoff Ill
Factor lfJI
Calculation I 25
I 26
27
28
I El Dispersion -
Area -
Adjustments ■ 31 .. 32
Tree & Barrel ..
Adjustments 1111
Results
Bl 11111 El ..
Automated Worksheet B.1: Calculation of Design Capture Volume (V2.0)
Description
Drainage Basin ID or Dramage ame
85th PercentiJe 24-hr Storm Depth J .18 1.18
Impervious Surfaces ot Directed to Dispersion Area (C=0.90) 1,465 3 278 2,515
Semi-Pervious Surfaces 'ot Serving as Dispersion Area (C=0.30)
Engineered Pervious Surfaces Jot Serving as Dispersion Area (C=0.10)
atural Type A Soil ot Serving as Dispersion Area (C=0.10)
atural Type B Soil ot Serving as Dispersion Area (C=0.14) 1,643 1,643
atural Type C Soil 1ot Serving as Dispersion Area (C=0.23)
atural Type D Soil ot Serving as Dispersion Area (C=0.30)
D oes Tributary Incorporate Dispersion, Tree Wells, and/or Rain Barrels. Yes Yes Yes
Impervious Surfaces Directed to Dispersion Area per SD-B (Ci=0.90)
Semi-Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.30)
Engineered Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.10)
Natural Type A Soil Serving as Dispersion Area per SD-B (Ci=0.10)
Natural Type B Soil Serving as Dispersion Area per SD-B (Ci=0.14)
Natural Type C Soil Serving as Dispersion Area per SD-B (Ci=0.23)
atural Type D Soil Serving as Dispersion Area per SD-B (Ci=0.30)
Number of Tree Wells Proposed per SD-A 1 1 1
Avera e Mature Tree Canopy Diameter 20 27 22
Number of Rain B umber of Rain Barrels Proposed per SD-E
Average Rain Barrel Size
Total Tributary Area 3,108 4,921 2,515 0 0
Initial Runoff Factor for Standard Drainage Areas 0.50 0.65 0.90 0.00 0.00
Initial Runoff Factor for Dispersed & Dispersion Areas 0.00 0.00 0.00 0.00 0.00
Initial Weighted Runoff Factor 0.50 0.65 0.90 0.00 0.00
Initial Design Capture Volume 153 315 223 0 0
Total Impervious Area D ispersed to Pervious Surface 0 0 0 0 0
Total Pervious Dispersion Area 0 0 0 0 0
Ratio of Di Ratio of Dispersed Impervious Area to Pervious Dispersion Are n/a n/a n/a n/a n/a
Adjustment Factor for Dispersed & Dispersion Areas 1.00 1.00 1.00 1.00 1.00
Runoff Factor After Dispersion Techniques 0.50 0.65 0.90 n/a n/a
Design Capture Volume After Dispersion Techniques 153 315 223 0 0
Total Tree Well Volume Reduction 180 342 224 0 0
Total Rain Barrel Volume Reduction 0 0 0 0 0
Final Adjusted Runoff Factor 0.00 0.00 0.00 0.00 0.00
Final Effective Tributary Area 0 0 0 0 0
Inmal Design Capture Volume Re Initial Design Capture Volume Retained by Site Design Elements 180 342 224 0 0
Final Design Capture Volume Tri Final Design Capture Volume Tributary to BMP 0 0 0 0 0
I'll! Units
inches
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
yes /no
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
sq-ft
#
ft
#
gal
0 0 0 0 0 sq-ft
0.00 0.00 0.00 0.00 0.00 unitless
0.00 0.00 0.00 0.00 0.00 unitless
0.00 0.00 0.00 0.00 0.00 unitless
0 0 0 0 0 cubic-feet
0 0 0 0 0 sq-ft
0 0 0 0 0 sq-ft
n/a n/a n/a n/a n/a ratio
1.00 1.00 1.00 1.00 1.00 ratio
n/a n/a n/a n/a n/a unitless
0 0 0 0 0 cubic-feet
0 0 0 0 0 cubic-feet
0 0 0 0 0 cubic-feet
0.00 0.00 0.00 0.00 0.00 un.itless
0 0 0 0 0 sg-ft
0 0 0 0 0 cubic-feet
0 0 0 0 0 cubic-feet
Calculations
Slope
0.1Q2 Steep
Impervious Area
Pervious Area
Pervious Pavers
IMP Type Area Factor Vl Factor
Cistern N/A
Rain Guage
Oceanside
Surface Type Runoff Factor
0.17 Concrete (1.0) 1
0.11 Landscape (0.1) 0.1
0.00 Solid Unit Pavers o 0.2
Surface Area Required (ft2) Vl Requ V2 Required (ft3)
1,390.82 0.00
Surface Area
Provided (ft2) Vl Provided (ft3) V2 Provided (ft3)
1,400.00
Calculations
Q =Cd X A X (2gH)0"5 Orifice Discharge Equation
(2) Orifice Area Equation (for 0.1Q2 as lower limit threshold)
g= 32.2 H = 5.0000
ft/s2 ft
Cover Slope Q2 Sizing Factor DMA Area (ac) Orifice Area (in2) Orifice Dia . (in)
A.1 ( ains to Biofiltration) t e 0.24 0.29 0.35
Soil Cover
Rain Gauge
Oceanside A Scrub 0.32
Oceansi e A Scrub 0.367
Oceanside Scrub .42
Oceanside B Sc b 0.365
Oceanside B Scru 0.
Oceanside B Scru
Oc anside C Scrub 0.1 6
Oc ansid C 0.185
Oceanside C 0.21
Oceanside D Low .175
Oceanside od ra 0.212 0.455
Oceanside Steep 0.2 0.57
Oceanside Urban oderate 0.152 0.411
Urban oderate 0.188 0.434
C Urban od rate 0. 16 0. 5
D Ur an oderate 0. 47 0.571
mpe ious oderate 0.557 0.949
,'
~rage System Drawdown Time For Basin:
Sys~: EcoRain A.1 (Drains to Biofiltration)
Orifice D~) Orifice Dia. (in) Footprint (Ft2) Drawdown Time (hours)
c'-Q3 0.35 280 17.350 6 Hours -OKAY
"-I
Depth of Water
~cl
liTime I fiTime in Storage
Chamber 6 Vol (ft3) (sec ) 6 Time (min) (hours)
5.0000 0.04~34423 0 /
4.9167 0.04356\765 23.33 533.32 / 8.88 0.14
4.8333 0.043195~_7 23.33 537.86 / 8.96 0.14
4.7500 0.04282197~ '-23.33 542.52 / 9.04 0.15
4.6667 0.042444685 '\. 23.33 547.30 / 9.12 0.15
4.5833 0.042064008 '\. 23.33 552.21 / 9.2 0.15
4.5000 0.041679854 '\. 23.33 557.25 / 9.28 0.15
4.4167 0.041292126 '\. 23.33 562.43 V 9.37 0.15
4.3333 0.040900722 '\. 23.33 567.7/ 9.46 0.15
4.2500 0.040505537 ~3.33 57Y-l5 9.55 0.15
4.1667 0.040106458 2~3 '/8.90 9.64 0.16
4.0833 0.039703368 23.~ /584.72 9.74 0.16
4.0000 0.039296143 23.33 )( 590.72 9.84 0.16
3.9167 0.038884654 23 .?Jl \:,96.90 9.94 0.16
3.8333 0.038468763 2Y B ~3.29 10.05 0.16
3.7500 0.038048327 L 3.33 60~8 10.16 0.16
3.6667 0.037623192 / 23.33 616.I's 10.27 0.17
3.5833 0.037193199 / 23.33 623.74 '\. 10.39 0.17
3.5000 0.036758176 / 23.33 631.04 '\. 10.51 0.17
3.4167 0.036317942 / 23.33 638.60 '\. 10.64 0.17
3.3333 0.035872306 / 23.33 646.44 '\. 10.77 0.17
3.2500 0.035421065 'I' 23.33 654.57 '\. 10.9 0.18
3.1667 0.0349639~ 23.33 663.01 '\. 11.05 0.18
3.0833 0.03459()88 23.33 671.80 '\. 11.19 0.18
3.0000 0.034~1458 23.33 680.94 '\. 11.34 0.18
2.9167 o.gl355547 23.33 690.46 '\. 11.5 0.19
2.8333 0~33072632 23.33 700.40 ~1.67 0.19
2.7500 / 0.03258264 23.33 710.78 1~4 0.19
2.6667 V 0.032085166 23.33 721.63 12.0) 0.2
2.58~ 0.031579857 23.33 733.00 12.21 I\.. 0.2
2.SJO0 0.031066329 23.33 744.92 12.41 \.. 0.2
~167 0.030544168 23.33 757.44 12.62 'Q.21
/2.3333 0.030012925 23.33 770.62 12.84 ov
/ 2.2500 0.029472107 23.33 784.51 13.07 0.21' '-
/ 2.1667 0.028921178 23.33 741.29 12.35 0.2
/ 2.0833 0.028359548 23.33 814.70 13.57 0.22
/
DrawDown Cale Pa e g
'•
2.0000 0.027786569 23.33 831.16 13.85 0.23
\. 1.9167 0.027201523 23.33 848.66 14.14 0.2~'
' 1.8333 0.026603614 23.33 867.32 14.45 oft
" 1.7500 0.025991955 23.33 887.27 14.78 ~.24
'-1.6667 0.025365551 23.33 908.66 15.14 /0.25
'\..5833 0.024723281 23.33 931.67 15.52 / 0.25
1.~00 0.024063875 23.33 956.53 15.91 ' 0.26
1.41~ 0.023385883 23.33 983.49 16/9 0.27
"" 1.3333 '-0.022687639 23.33 1012.87 ft.88 0.28
1.2500 ,021967212 23.33 1045.05 /17.41 0.29
1.1667 o.~1222343 23.33 1080.50 / 18 0.3
1.0833 0.02~50361 23 .33 1119.83 / 18.66 0.31
1.0000 0.0196~071 23.33 1163.80 / 19.39 0.32
0.9167 0.018811~ 23.33 1213.39 / 20.22 0.33
0.8333 0.01793515j \. 23.33 1269.91 / 21.16 0.35
0.7500 0.017015729 " 23.33 1335.16 / 22.25 0.37
0.6667 0.016042583 ' 23.33 1411.64 / 23.52 0.39
0.5833 0.015006462 ' 23.33 1502.99 / 25.04 0.41
0.5000 0.013893285 '-23.33 1614.77 I 26.91 0.44
0.4167 0.012682776 "3.33 1755.9,I! 29.26 0.48
0.3333 0.011343819 2~3 194729 32.37 0.53
0.2500 0.009824036 23 .3" 2~4.60 36.74 0.61
0.1667 0.008021292 23.33 V 615.o6 43.58 0.72
0.1000 0.006213266 18.67 / 2\22.72 43.71 0.72
0.0900 0.005894421 2.~ 4~51 7.7 0.12
0.0800 0.005557314 n o 489.~ 8.15 0.13
0.0700 0.005198391 /2.80 520.65 \. 8.67 0.14
0.0600 0.004812775 / 2.80 559.37 ' 9.32 0.15
0.0500 0.004393442 / 2.80 608.28 ' 10.13 0.16
0.0400 0.003929614 / 2.80 672.82 ' 11.21 0.18
0.0300 0.003403146 / 2.80 763.69 " 12.72 0.21
0.0200 0.002778657 / 2.80 905.88 ' 15.09 0.25
0.0100 0.001964807,' 2.80 1180.57 " 19.67 0.32
0.0000 /J 2.80 2850.15 " 47.5 0.79
Total ol. 1400.00 Total Hours 17.35
l*Omax I
DrawDown Cale Page 2
. '
ATTACHMENT 3
Structural BMP Maintenance Information
Use this checklist to ensure the required information has been included in the Structural
BMP Maintenance Information Attachment:
Preliminary Design/Planning/CEQA level submittal:
Attachment 3 must identify:
~ Typical maintenance indicators and actions for proposed structural BMP(s) based
on Section 7.7 of the BMP Design Manual
Final Design level submittal:
Attachment 3 must identify:
[I 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)
c·1 How to access the structural BMP(s) to inspect and perform maintenance
D Features that are provided to facilitate inspection (e.g., observation ports,
cleanouts, silt posts, or other features that allow the inspector to view necessary
components of the structural BMP and compare to maintenance thresholds)
D Manufacturer and part number for proprietary parts of structural BMP(s) when
applicable
O Ma intenance thresholds for BMPs subject to siltation or heavy trash(e .g., silt level
posts or other markings shall be included in all BMP components that wi ll 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.)
□ Recommended equipment to perform maintenance
Cl When applicable, necessary special tra ining or certification requirements for
inspection and maintenance personnel such as confined space entry or
hazardous waste management
',
ATTACHMENT 3A
Maintenance Plan
Klovanish Residence
Treatment BMP Maintenance Plan for Vexetated BMPs
Typical Maintenance lndicator{s) for Vegetated BMPs Maintenance Activities
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 as appropriate, but not less than the design height
of4".
Overgrown vegetation
Erosion due to concentrated irrigation flow Repair/re-seed/re-plant eroded areas and adjust the irrigation
system.
Repair/re-seed/re-plant eroded areas, and make appropriate
corrective measures such as adding erosion control blankets,
Erosion due to concentrated storm water ru noff flow adding stone at flow entry points, or minor re-grading to
restore proper drainage according to the original plan. If the
issue is not corrected by restoring the BMP to the original plan
and grade, the Engineer sha ll be contacted prior to any
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 than 96 hours following a storm event* vegetation, clearing underdrains, or repairing/replacing clogged
or compacted soi ls.
Obstructed inlet or outlet structure Clear obstructions.
Damage to structural components such as weirs, inlet Repair or replace as applicable. or outlet structures
*These BMPs typica lly include a su rface ponding layer
as part of their function which may take 96 hours to
drain following a storm event.
•
Klovanish Residence
Treatment BMP Maintenance Plan
Maintenance Indicators and Actions for Detention BMPs
ypical Maintenance lndicator(s)
for Detention Basins
Erosion due to conce
flow
Erosion due to concentrated
water runoff flow
Erosion due to concentrated irrigation fl
Accumulation of sediment, litter, or
debris
Standing water
Obstructed inlet or outlet str
Damage to structural c
or outlet structures
Maintenance Activities
Re-seed, re-establish vegetati
Repair/re-seed/re-plant eroded areas an
system.
Mow or trim as appropriate, but ot less than the design height
oded areas and make appropriate
corrective measures s as adding erosion control blankets,
adding stone at flo ntry points, or re-grading where
necessary.
Make approp · te corrective measures such as adjusting
removing obstructions of debris or invasive
re-grading for proper drainage.
Clear obstructions.
Repair or replace as applicable.
2
Klovanish Residence
Treatment BMP Maintenance Plan
Maintenance of Biofiltration Only BMPs
• Access of Structural BMPs for Inspection and Maintenance
o The Bio-filtration OnJy BMPs consist of one (1) vegetated areas:
• IMP A. 1 -23 6 ft2
A 1.S'x1.5' concrete inlet will be installed within the BMP with its ri elevated 10"
bove the surface. The total depth of the inlet will be approximate 3'.
o inlet will be visible from the surface and can be accessed tl ugh the grate.
The depth will not require a ladder to access the full e ent of the inlet.
o The 61 tration basin is accessible from the front yard of private residence.
o Any grasses wit · the biofiltration areas shall be c when in excess of 4" tall.
o Debris & sedimen hall be cleared from the bas· when 2" have accum ulated.
o Any amount sedime or debris accumulation
shall be removed when een.
o During routine landscape aintenance ac · ities, if bare areas or erosion are
observed they shall be re-se ed.
o If standing water is observed r lon than 24-hours the soil media shall be
inspected for clogging and dean
o Soil media within the bior ention area sh be replaced when the filtration rat
drops below 5" /hour if gular maintenance annot restore this rate.
• Recommended Mainten
•
o Equipment nee ed for maintenanc
landscape m · tenance:
•
Lawn mower
Hedge clippers
Other
o Maintenance and inspection activities required are typical for routine landscape
maintenance. o special training required.
,,
•
3
...
• Klovanish Residence
Treatment BMP Maintenance Plan
Maintenance of Cistern BMPs
Access of Structural BMPs for Inspection and Maintenance
o The Cistern BMP consists of 1 system:
• IMP A.2 -1,400 ft3 Cistern
access port will be installed at the outlet of the cistern. The
su ace to the bottom is approximately 2' and will not require
safe cess should a person need to clean out debris by hand
pth from the
mall step latter for
o The ac ss port will be visible from the surface and will be ccess by removing the
lid / cover irst.
o The cistern be accessible from the front yard
• Maintenance Threshol
o Sediment or debris ace ulation within the stern shall be removed when a 3"
depth is observed.
o If standing water is observ an 24-hours the inletand outlet pipes shall
be inspected for blockages.
• Storage Chamber Replacement
o Chamber replacement will o
o Permanent damage to cha
the system.
• Recommended Mainten
•
o Equipment ne ed for maintenance will typically inclu
landscape m · tenance:
• T ck mounted vacuum
and Shovels
Step ladder
Other
o Maintenance should only be done by individuals who have received training
manufacturer or other who have.
4
Klovanish Residence
Treatment BMP Maintenance Plan
Maintenance of Tree Well BMPs
• Access of Structural BMPs for Inspection and Maintenance
o The Tree Well BMPs consists of 3 trees:
• IMP A.1.1 20' Diameter (mature canopy) Southern Magnolia
• IMP A.1 .2 27' Diameter (mature canopy) Sweet Gum tree
• IMP A.1.3 22' Diameter (mature canopy) Southern Magnolia
o All trees can be accessed through th.e S'xS' grate held in place by a concrete curb.
o Two trees (IMP A.1.1 and IMP A.1 .2) are located in the back yard. IMP A.1.3 is
located in the southwest corner of the front yard.
• Maintenance Thresholds
o Sediment or debris accumulation \vithin th.e tree well shall be removed when a 2"
depth is observed.
o If standing water is observed for longer than 24-hours the inlet and outlet pipes shall
be inspected for blockages.
• Tree Well Replacement
o Tree replacement will only be necessary if the tree appears to have died.
o In the event the tree needs to be replaced, the 30" min. soil media installed sirectly
under the S'xS' grate shall be inspected for evidence of saturation. If saturated soil is
observed an underdrain may need to be installed. Contact a licensed civil engineer
for guidance.
• Recommended Maintenance Equipment
o Equipment needed for maintenance will typically include those needed for routine
landscape maintenance:
• Hand Shovels
• Trash bins
• Other
• Special Training
o Regular maintenance can be performed by the property owner.
o Tree removal and replacement shall be done by competent individuals
2
•,
•
•
ATTACHMENT 4
City standard Single Sheet BMP (SSBMP) Exhibit
[Use the City's standard Single Sheet BMP Plan.]
., ~·
I
•
I -------I
I
I
,-----1 .... -------' /
27' MIN. DIA.
CANOPY TREE WELL
(SWEET GUM)
PROPOSED SINGLE
FAMILY RESIDENCE
114
112 -----I
I I
·--·-------I -
108
106 -
' I
'--'--
'-,_ 108
I
I
@
1 18
116
112
I
I
I
I
I
I
I
I
I
I
I
L_
I ' _,,,
I ,'--/_,,,
I --
1
I
I
I
I
L 20' MIN. DIA.
CANOPY TREE
(S. MAGNOLIA)
WEL L
' / ' / .. __ ......... ___ _
··--------..... --~-~
/----nf-L-<::· 1 I
~ ®t
I
I
I a -I "i --
I
I
I
I X
I It I
I -"' ,,. ;:,
I -"'
I <
I
I
rn~'~ ----------
96
94
----·--
-----' ' -
---(jMAX-=2. 3 3-6-FS ~~~~--_-_=:__=~A_f_DQ_A~M[§S_Q_s[!T_BRJf=J~~s~MA;x 4 . 40 FPS
OTAL-UNMITIGATED
QMAX=2. 60
VMAX =4. 78
CFS
FPS
C --------------
10 0
I~ ---
-
70 20
SCALE: 1 "= 1 O'
30
i
DATE INITIAL
ENGINEER OF WORK
DESCRIPTION
CMU RETAINING WALL
P.C.C. BROW DITCH
LEGEND
STD DWG SYMBOL
0-75
DRAINAGE SWALE OR DIRECTION OF FLOW
BROOKS BOX (OR SIM) W/GRATE
-----------
(SIZE PER GRADING PLAN)
DOWNSPOUT
6" PERFORATED
UNDERDRAIN @2%
6'" ATRIUM GRATE UNLESS
OTHERWISE NOTED ON PLAN
BMP ID# BMPTYPE SYMBOL CASQA NO. QUANTITY
TREATMENT CONTROL & HYDROMODIFICATION
CD TREE WELL @ SD-A 3 EA.
LOW IMPACT DESIGN (L.I.D.)
@ ROOF DRAIN TO <@-TREE WELL SD-11 7 EA.
SOURCE CONTROL
®-® DRAINAGE SYS. • MAINTENANCE SC-44 12
0 FOUNTAIN & POOL 0 MAINTENANCE SC-72 2
* WEEKLY DURING RAINY SEASON/QUARTERLY DURING DRY SEASON
DATE INITIAL
REVISIO N DESCRIPTION OTHER APPROVAL
NOS #BO
BMP TABLE
DRAWING NO. SHEET NO.(S) INSPECTION MAINTENANCE CONSTRUCTION
FREQUENCY FREQUENCY SIGN OFF
Sheet2 * ANNUALLY (SEE BELOW)
Sheet 2 QUARTERLY ANNUALLY
Sheet 2 * ANNUALLY (SEE BELOW)
Sheet 2 WEEKLY Bl-MONTHLY
GR NO. 2017-0026
MAINTENANCE AGREEMENT DOCUMENT: YES NO
RECORDATION NO. ____ _
PARTY RESPONSIBLE FOR MAINTENANCE:
NAME ________ _ CONTACT _____ _
ADDRESS _______ _
PHONE NO. ______ _
PLAN PREPARED BY:
NAME DANIEL VALDEZ
COMPANY COFFEY ENGINEERING , INC.
ADDRESS 9666 BUSINESSPARK AVE. SUITE 210
SAN DIEGO, CA
92131
PHONE NO. (858) 831-0111 CERTIFICATION _7_60_7_4 __ _
BMP NOTES:
1. THESE BMPS ARE MANDATORY TO BE INSTALLED PER MANUFACTURER'S
RECOMMENDATIONS OR THESE PLANS.
----2. NO CHANGES TO THE PROPOSED BMPS·0WfHtS-SHEE'f·WITHOl:IT PRIOR --
DATE INITIAL
CITY APPROVAL
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.
I SH I ET I CITY OF CARLSBAD I SH I ETS I
ENGINEERING DEPARTMENT
SINGLE SHEET BMP SITE PLAN
I I/) ·: I ; I; l I h' I:, 'I I .1 l1 : 111 'I<
L" i I, ' " I : I ' I ; I i' I ' I
hl'.l'ORl1 I ' ( I ! PROJECT NO.
DRAWING NO.
INITIAL DATE
.,.-:
.-
------
/ --
I
I
', I
', I
' • I '-,, / l
-..,-....._ ', .,,..,,,,.--_/ / I
PROPOSED LOCATION ',, -,, ______ _,,.,,-// i
OF ELECTRICAL ',,,,_. ✓✓--✓ :
CONNECTION •. , ---------,... / ,,., -------____ / --------i
I·~--~-~=-:
-""·""· .,.,_ ,,.______ !'!'--I :,
• -. --; --::-,..; -.,,,,. _______ .... _ ~ --I I
I
I
I •
I
•
•
--"'~"'-=·----~ -~ ~ ;;~----I i
fib-----------=--~ --,; ------I ,: -------·--. ~
---~'!'"'!:~ I
-------:::~ ~ ~ -I ,: --~ -=-----'
r---------...._
I '..., ,,,--------
I ..._ .,,, ,,,,,,
I "--,. ,,,,,,
I "..., ,,,,,,
I '-/ I , ___ ,...
I
I
I
I
I
I
I
I
I
I
I
I
L -----------7 ,----
1 ' \ I ' \ /
---
" I •
-------~ -L____ L ___________________ \
--------r-------
, ______ ,,,,.
-: l . ." . ~it ~ <l•
i :----..-~-
I I • ,. .
I
I •• "· .
I • " I •
I
I
I ••
••
•
111---=-I 1 8 , .
L •
• I •
. •
• I •
I •116-.·--
I
I '
.· .
•
. .
.
• 08 •· ' i-----1 -.-.
• ·• .•
•
CJ' lt-----t-10t>--rl
•
•
I! ..
• I
lf----~•~104-'-
/
0
w..._
----1s0-6!
II I SC-6. 11
SD-5
[sc-6.51
I
0
ISC-6.151
---------==-.,,. \ I
--------\ I Iv\ s s ------_:----·---', // ~= s ---,_ ,,,,,, --~ ~ -_,__ --+58::7'1-'' "" ---------··-_________ / ' ~ ---~ ' ' ' ' !So ~~,,,,.sc-,,,.--y --------·--, --------------~ ' ' >s "" I ,?5 , ----------...._
',. ""~~--l.?4 I /
" ' " ~ I I / ',, , ..... __ -L_ ~ y /
, , I '
--', I I -' , .......... _ . ----', / ,· .......... --'
-------st:-6.5
IS0 -31 ---
1so~5J
!SC-6.t!
,, i' -----_-_-_-.,:... ~ / 1'
I I
I I I
@ !SC-6.151 ,
I ISC-6.51
~~
I I I
,.z 1 I I
I I I I
I I I .. / ;·
I I I , , I
5z 10 I . ---.,1,,\:_)1 I
~-'---":'.', r i / '-c.::,J '· I
t I I
I I I
I I
I I I
I I I
I I I
f I I
I I I
I
I I
I I
I I
!S0=31 ./ f . · --,,,_
·0 ·. IS0-4! --~ -~: __ ;✓---10 6~
-·~·--1oi ---__ 1 __ ___ ...--104 -~-,
I " .
I
' I
. ' Q ,'
E:::::.:J_
II
l
f /' "--)I
mrr.m. rr·il·IIIJ;cIIIIlffi' -----..:::-~---1 -''v,,,., .---· 1 oi::.? = .::,-~ \ , ~ -\,. ' --\ / --===~ y 11 I
I .
I
, s_c-6.1 . 1 / , _ -.:::---""~~°' ., _ -r
• Sfl.:::6 1 \ t ----"' -r".
~---100-.-' \ 1 ,...,,<.,_-rv'\_----_,:;:/ --------)sc-11 I
I
I
r " .. .. . ,, \ \ I // ,_ ~. __,,,., _.,,,,_;;;;:------\ -' ,.,.,,,,,. _,,,,.,.,,,.,. -I
\ \ I ;1 / ,'U.-n_, -.-_,,,,,., ---~'=---~---~/r-=-------------~-=--. I . . •
I '
.. -<7,,
• q
I ,
' q
·•
I • cJ . • ~ 1 o'/J_ · .,. ...... .,.---,___
I ""· <'
I'
I •
I
\
~ .. (y\ "' . \:_) ------94----=-----
1 \ I I ~ ~,,,.-111 ------
1 \ \ J /L ~ ~ _,,::::,,:::: 0228 FT' 70 ---1-I
\ \ \ '~, / -,;:;:,;:;:,;:;:-, 8/0F!LTRATION 4 ',,,
\ ----_i / .::=-_;;;;: -./ AREA I ', -,,,,,,--" 102 \ C-1 \ .--'-. @-i,400 FT' _______ ,, ' ', 1,..---1 --~CISTERN --.:~----~---------------=-/ ,'; I .... --✓ -~----~ I ---.,,------__" --\ ' ----..,,,,---I -,,~--,_-----:::.:::-:::--.~-=='-"'"-"~--:::~5;,.;;~:~::0':_::~--;:=~---'-:=-=====:-·_· _-_-_-··_---.,.-~~--=:-:· -~98 I 'I! ---~ /I ~';;;-"-;,.--...---96 I too-~,,7'-.J~--
------=.---~ i-----~-;;;;;:::~--------=~2: ·. ------. ---=-= --0 ,__,._,~---:s~~-;. :::=~~~;;;;-~-~~~~7 "5 ____ ,:,_ ~-_CCC. -~~--~~-~~ :--.."
.---...... __
STREEF -
-----------
--
--
10 0 10 20 30 1:.,.:1--.:_~-~-~---•i::.::.::.::.::.::.::.::.i,11_•_•_•_•_•_•_-_1
SCALE: 1 "= 1 O'
---------------------·---------~------------------------------------------------------
DA TE INITI AL
ENGINEER OF WORK
BMP ID# BMPTYPE SYMBOL CASQA NO. QUANTITY
TREATMENT CONTROL & HYDROMODIFICATION
CD
®
BIO RETENTION
AREA
STORM WATER
STORAGE VAULT
I ._._._.,.
N/A
LOW IMPACT DESIGN (L.1.D.)
@ ROOF DRAIN TO
LANDSCAPING
SOURCE CONTROL
'Y'-'Y' DRAINAGE SYS.
\:_! v MAINTENANCE
0
*
FOUNTAIN & POOL
MAINTENANCE
TC-32
TC-11
SD-11
236 S.F.
3 1.400 FT.
7EA.
12
2
NY SEASON/ QUARTERLY DURING DRY SEASON
BMP TABL E
DRAWING NO. SHEET NO.(S) INSPECTION
FREQUENCY
MAINTENANCE
FREQUENCY
503-9A
503-9A
503-9A
503-9A
-
2 *
2 * ANNUALLY
2 QUARTERLY ANNUALLY
2 * (SEE BELOW) ANNUALLY
2 WEEKLY Bl-MONTHLY
GR NO. _2_0_17_-0_02_6_
MAINTENANCE AGREEMENT DOCUMENT: YES _X_ NO
RECORDATION NO. _____ _
PARTY RESPONSIBLE FOR MAINTENANCE:
NAME STEVE KLOVANISH CONTACT STEVE KLOVANISH
ADDRESS 2721 CARLSBAD BLVD.
CARLSBAD CA
92008
PHONE NO. (760)846-9090
PLAN PREPARED BY:
NAME DANIEL VALDEZ
COMPANY COFFEY ENGINEERING, INC.
ADDRESS 9666 BUSINESSPARK AVE. SUITE 210
SAN DIEGO, CA
92131
PHONE NO. (858) 831-0111 CERTIFICATION 76074 -----
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.
CITY OF CARLSBAD I SH~ETS I
ENGINEERING DEPARTMENT
SINGLE SHEE MP
I I/)· .
I
PROJECT NO.
C: IUU I 'r (HJ ·,,
DATE INITIAL DATE INITIAL
REVISION DESCRIPTION OTHER APPROVAL CI TY APPROVAL INITIAL DATE