HomeMy WebLinkAboutCT 16-02; OCEAN CONDOMINIUMS; STORM WATER QUALITY MANAGEMENT PLAN OCEAN CONDOMINIUMS; 2021-12-12
Prepared for:
Carlsbad 17 GP, LLC 234 Venture Street, Suite 100 San Marcos, CA 92079
Prepared by:
TAYLOR GROUP, INC. 301 Mission Avenue, Suite 201 Oceanside, CA 92054
760.721.9990
TGI Project No. 19.00911-0700
December 12, 2021
CITY OF CARLSBAD
PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER
QUALITY MANAGEMENT PLAN (SWQMP) FOR OCEAN CONDOMINIUMS
CT16-02 / RP16-08
GR2019-0028 DRAWING No. 519-5A SWQMP No.519-5
ENGINEER OF WORK:
_________________________________________ Larry R. Taylor, RCE, GE, QSD
RCE 58274, Expires 06.30.2022
CERTIFICATION PAGE
Project Name: OCEAN CONDOMINIUMS Project ID: CT 16-02 / RP 16-08 I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs for this project, and that I have exercised responsible charge over the design of the project as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the requirements of the BMP Design Manual, which is based on the requirements of SDRWQCB Order No. R9-2013-0001 (MS4 Permit) or the current Order.
I have read and understand that the City Engineer has adopted minimum requirements for managing urban runoff, including storm water, from land development activities, as described in the BMP Design Manual. I certify that this SWQMP has been completed to the best of my ability and accurately reflects the project being proposed and the applicable source control and site design BMPs proposed to minimize the potentially negative impacts of this project's land
development activities on water quality. I understand and acknowledge that the plan check review of this SWQMP by the City Engineer is confined to a review and does not relieve me, as the Engineer in Responsible Charge of design of storm water BMPs for this project, of my responsibilities for project design.
TAYLOR GROUP, INC.
_____________________________________
Larry R. Taylor, RCE, GE, QSD RCE 58274, Expires 06.30.2022 Date: December 12, 2021
Structural BMP Summary Information
Structural BMP ID No. CI.01
DWG 519-5 Sheet No. 3
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☐ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which
onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☒ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed): CI.01 is a multi-level screen curb inlet filter to be installed in an existing Type B curb inlet located in the right-of-way approximately 225 feet north of the northerly property boundary. The proposed filter is a Bio Clean Curb Inlet Filter consisting of an insertable curb inlet basin filter system designed to capture fine to coarse sediments, floatable trash, debris, and other pollutants conveyed in stormwater runoff. The proposed filter system is a multi-level screen. The system with the multi-level screen
addresses a wide array of pollutants including trash and debris, sediments, TSS, nutrients, metals, and hydrocarbons. Sediment and nutrients are pollutants of concern for the receiving waters. The filter insert system includes an expandable trough installed in the curb inlet that is designed to convey water quality design flows through the filter basket while allowing peak flows to bypass over the trough without resuspending captured pollutants.
CI.01 is intended accept runoff from approximately 1,650 s.f. of replaced impervious AC and PCC pavement and minor landscaped areas in the right-of-way along the project frontage of State Street.
It is noted that a planned sump at the lobby entrance will discharge flow from a channel drain at the drive entrance (DMA 06) and possible underflow from the permeable paver walkway in the southerly
side yard (DMA 02) to a biofiltration planter (BIO.09) that will in turn discharge to the State Street gutter via a sidewalk underdrain. Treated discharge from biofiltration planter BIO.09 will be
intercepted by the curb inlet. The treated discharge from the sump/biofiltration planter that will flow to the curb inlet following the “first flush” from a storm event was considered in sizing calculations for
CI.01.
The proposed filter insert has a media treatment flow capacity of 2.85 cfs and unlimited bypass flow capacity. The calculated design flow for the Site DMA’s discharging to the inlet is 0.015 cfs.
Curb Inlet Filter
A Stormwater Trash Capture Solution
A Forterra Company
OVERVIEW
The Bio Clean Curb Inlet Filter is an insertable catch basin filter system designed to capture fine to coarse sed-
iments, floatable trash, debris, and hydrocarbons conveyed in stormwater runoff. The filter system is available in three different model types: Full Trash Capture, Multi-Level Screening (MLS), and the revolutionary Kraken type media filter insert model.
The Curb Inlet Filter is an effective and economical solution to help property owners, developers, and municipalities meet local, state, and federal water quality requirements and regulations. The expandable trough system is designed to convey water quality design flows through the filter basket while allowing peak flows to bypass over the trough without resuspending captured pollutants. The modular design of the trough system makes it adaptable to any size or type of curb inlet catch basin.
The Curb Inlet Filter provides easy access for maintenance from the surface without having to enter the catch basin. Maintenance service takes about 15 minutes and requires no confined space entry.
This filtration system addresses a wide array of pollutants including trash and debris, sediments, TSS, nutrients, metals, and hydrocarbons.
ADVANTAGES
• EASIEST TO MAINTAIN TROUGH SYSTEM ALLOWS FOR 15-MINUTE OR
LESS SERVICE TIME
• STAINLESS STEEL AND FIBERGLASS CONSTRUCTION
• 8-YEAR WARRANTY
• WORKS IN ANY SIZE CATCH BASIN
• NO NETS OR GEOFABRICS
• 15+ YEARS USER LIFE
PERFORMANCE
FULL TRASH CAPTURE TYPE
100%REMOVAL OF
TRASH AND
DEBRIS
• MEETS FULL
CAPTURE
REQUIREMENTS
OPERATION
Bypass Flow Path
Treatment Flow Path
Curb Opening
Trough System
Manhole Cover
Non-Clogging
Screen
Outflow Pipe
Bypass Weir
Bottom
Screen
Hydrocarbon
Boom Rail
Hydrocarbon Boom
Note: Treatment flow rate limited to the weir capacity - actual flow rates of the filter basket is greater than 2.85 cfs.
Various depth filter baskets available.
SPECIFICATIONS
MODEL #TREATMENT FLOW
CAPACITY (cfs)
BYPASS FLOW
(cfs)
BIO-CURB-FULL 2.85 UNLIMITED
• Parking Lots
• Roadways
APPLICATIONS
80%
REMOVALOFSEDIMENTS
100%
REMOVALOF FOLIAGE
100%
REMOVALOF TRASH
CURB INLET FILTER
PERFORMANCE
MULTI-LEVELSCREENING
The Bio Clean Multi-Level Screening Curb Inlet Filter is the
standard configuration used for more than a decade and provides
the best overall performance for all pollutants of concern.
Note: Treatment flow rate limited to the weir capacity – actual flow rates of the filter basket is greater than 2.85 cfs.
Various depth filter baskets available.
SPECIFICATIONS
MODEL #SCREEN TREATMENT FLOW
(cfs)
BYPASS FLOW
(cfs)
BIO-CURB-MLS 2.85 UNLIMITED
Hydrocarbon Boom
Coarse Screen
Medium Screen
Fine Screen
Treatment Flow Path
• MEDIUM LEVEL REMOVAL FOR PARTICULATE METALS AND NUTRIENTS
• INCLUDES HYDROCARBON BOOM FOR REMOVAL OF OILS AND GREASE
OPERATION
72% REMOVAL
OF DISSOLVED
PHOSPHORUS
58%
REMOVAL
OF
ZINC
85%
REMOVAL
OF
FINE TSS
87%
REMOVAL
OF
LEAD
52%
REMOVAL
OF
COPPER
60%
REMOVAL
OF FECAL
COLIFORM
(BACTERIA)
81% - 95%
REMOVAL
OF OILS
AND GREASE
(MOTOR OIL)
CURB INLET MEDIA FILTER
PERFORMANCE
KRAKENTYPE
The Bio Clean Kraken Curb Inlet Media Filter is an
advanced membrane filter for increased removal efficiencies.
Treatment Flow Path
Kraken Filter Cartridges
Note: Media treatment flow rate based on three 30” tall Kraken filter cartridges. Various filter basket and Kraken
Filter Cartridge heights available.
SPECIFICATIONS
MODEL #MEDIA TREATMENT FLOW (cfs)BYPASS FLOW(cfs)
BIO-CURB-KMF-30 0.11 UNLIMITED
OPERATION
Cleaned easily with vac truck, without catch basin
entry, and about 15 minutes is required for service.
The Curb Inlet Filter features a folding weir that hinges up after the basket is removed to allow easy access to the catch basin if needed.
Easily removed without entry into basin.
Always positioned under manhole opening.
MAINTENANCEINSTALLATION
Vac Truck Hose
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 1a: DMA Exhibit Attachment 1b: Tabular Summary of DMAs and Design Capture Volume Calculations Attachment 1c: Harvest and Use Feasibility Screening (when applicable) Attachment 1d: Categorization of Infiltration Feasibility Condition (when applicable)
Attachment 1e: Pollutant Control BMP Design Worksheets / 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
PROJECT VICINITY MAP
E-34 Page 1 of 4 REV 02/16
Development Services
Land Development Engineering
1635 Faraday Avenue
(760) 602-2750
www.carlsbadca.gov
STORM WATER STANDARDS
QUESTIONNAIRE
E-34
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: PROJECT ID:
ADDRESS: APN:
The project is (check one): New Development Redevelopment
The total proposed disturbed area is: ________ ft2 (________) acres
The total proposed newly created and/or replaced impervious area is: ________ ft2 (________) acres
If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the
SWQMP # of the larger development project:
Project ID SWQMP #:
Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your
application to the city.
Ocean Condominiums
2501 State Street
0.980
CT 16-02/RP 16-08
155-200-10-00
42,700
21,565 0.495
NA NA
E-34 Page 2 of 4 REV 04/17
STEP 1
TO BE COMPLETED FOR ALL PROJECTS
To determine if your project is a “development project”, please answer the following question:
YES NO
Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building
or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)?
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 paved sidewalks, bicycle lanes or trails that meet the following criteria:
a)Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non-
erodible permeable areas;
b)Designed and constructed to be hydraulically disconnected from paved streets or roads;
c)Designed and constructed with permeable pavements or surfaces in accordance with USEPA
Green Streets 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, go to Step 3.
E-34 Page 3 of 4 REV 04/17
STEP 3
TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS
To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1)):
YES NO
1.Is your project a new development that creates 10,000 square feet or more of impervious surfaces
collectively over the entire project site? This includes commercial, industrial, residential, mixed-use,
and public development projects on public or private land.
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
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
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
development project includes development on any natural slope that is twenty-five percent or greater.
5.Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more
of impervious surface collectively over the entire project site and supports a parking lot? A parking lot is
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 street, road, highway, freeway or driveway surface collectively over the entire project
site? 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
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
shop is a facility that is categorized in any one of the following Standard Industrial Classification (SIC)
codes: 5013, 5014, 5541, 7532-7534, or 7536-7539.
9.Is your project a new development or redevelopment project that creates and/or replaces 5,000 square
feet or more of impervious area that supports a retail gasoline outlet (RGO)? This category includes
RGO’s that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily
Traffic (ADT) of 100 or more vehicles per day.
10.Is your project a new or redevelopment project that results in the disturbance of one or more acres of land
and are expected to generate pollutants post construction?
11.Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of
impervious surface or (2) increases impervious surface on the property by more than 10%? (CMC
21.203.040)
If you answered “yes” to one or more of the above questions, your project is a PDP. If your project is a redevelopment
project, go to step 4. If your project is a new project, go to step 5, check the first box stating “My project is a PDP …”
and complete applicant information.
If you answered “no” to all of the above questions, your project is a ‘STANDARD PROJECT.’ Go to step 5, check the
second box stating “My project is a ‘STANDARD PROJECT’…” and complete applicant information.
SITE INFORMATION CHECKLIST Project Summary Information
Project Name Ocean Condominiums
Project ID CT16-02 / RP 16-08
Project Address 2501 State Street
Assessor's Parcel Number(s) (APN(s)) 155-200-10-00
Project Watershed (Hydrologic Unit) Carlsbad 904
Parcel Area 0.487 Acre (21,223 Square Feet)
Existing Impervious Area
(subset of Parcel Area)
0.400 Acre (17.275 Square Feet)
Area to be disturbed by the project
(Project Area)
0.980 Acre (42,700 Square Feet)
Project Proposed Impervious Area
(subset of Project Area)
0.495Acre (21,565 Square Feet)
Project Proposed Pervious Area
(subset of Project Area)
0.113 Acre (4,935 Square Feet)
Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the Project. This may be less than the Parcel Area.
Description of Existing Site Condition and Drainage Patterns
Current Status of the Site (select all that apply):
☒ Existing development
☐ Previously graded but not built out
☐ Agricultural or other non-impervious use
☐ Vacant, undeveloped/natural
Description / Additional
Information:
Existing Land Cover Includes (select all that apply):
☒ Vegetative Cover
☒ Non-Vegetated Pervious Areas
☒ Impervious Areas
Description / Additional Information:
Underlying Soil belongs to Hydrologic Soil Group (select all that apply):
☐ NRCS Type A
☒ NRCS Type B
☐ NRCS Type C
☒ NRCS Type D
Approximate Depth to Groundwater (GW):
☐ GW Depth < 5 feet
☐ 5 feet < GW Depth < 10 feet
☐ 10 feet < GW Depth < 20 feet
☒ GW Depth > 20 feet
Existing Natural Hydrologic Features (select all that apply):
☐ Watercourses
☐ Seeps
☐ Springs
☐ Wetlands
☒ None
Description / Additional Information:
Description of Existing Site Topography and Drainage [How is storm water runoff conveyed from the site?
At a minimum, this description should answer (1) whether existing drainage conveyance is natural or urban; (2) describe existing constructed storm water conveyance systems, if applicable; and (3) is runoff
from offsite conveyed through the site? if so, describe]:
The Site is trapezoidal in shape and consists of an existing parcel measuring approximately 220 feet
by 100 feet for a total of 0.49 acres. The subject parcel is located at 2501 State Street and is identified
as Assessor’s Parcel Number 155-200-10-00. The project Site is bordered to the east by State
Street, to the south by an existing multi-family residential development, to the west by undeveloped
land and to the north by a commercial office building.
The Site is currently developed with a roughly 5,680 s.f. single story commercial office building, a
roughly 7,750 s.f. asphalt drive and parking lot and various hardscaped and landscaped areas. A 7-
foot high sound wall constructed of mechanically stabilized earth blocks extends across the westerly
property boundary and the westerly 40 feet of the southerly property boundary.
The Site slopes mildly down from the southwest to the northeast, with most of the site being relatively
level at a nominal elevation of El. 36 feet.
Existing drainage conveyance is urban and there are no offsite flows conveyed through the Site.
Runoff from approximately 94% of the Site flows from west to the east to State Street via surface
flow, roof downspouts and a sidewalk underdrain. Area drains capture the flow on portions of the
Site and convey it to a sidewalk underdrain. Once in the gutter of State Street, flow travels to the
northwest, where it enters existing storm drain piping at a curb inlet on the westerly side of State
Street approximately 250 feet northwest of the Site. The storm drain is a 66” pipe that discharges to
Buena Vista Lagoon approximately 80 feet northeast of the curb inlet.
A small portion of the site (approximately 0.03 acres, or 6% of the parcel area) flows to the adjacent
properties to the north and west.
Description of Proposed Site Development and Drainage Patterns
Project Description / Proposed Land Use and/or Activities:
The proposed project will consist of demolition of all existing improvements at the Site and
construction of 17 residential condominium units in a single structure with three habitable stories
over a partially subterranean covered parking/storage level accessed from State Street.
List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): The majority of the Site will consist of the building structure which will have and overall projected impervious area of 17,636 square feet. Onsite hardscape areas including exterior concrete stairs, walks, equipment pads, curbs and walls will total 370 s.f. outside the rooftop footprint, making the total onsite impervious area 18,530 square feet. The project will also replace existing curb, gutter, sidewalk and AC pavement totaling approximately 1,925 square feet of replaced impervious surface along the State Street frontage. Approximately 1,110 square feet of curb, AC driveway and a concrete trash enclosure in easements on the adjacent property to the north in connection with replacing existing sewer and water mains, for at total offsite replaced impervious area of 3,035
square feet.
List/describe proposed pervious features of the project (e.g., landscape areas): Approximately 2,655 square feet of the ground floor of site outside the building footprint will consist of permeable paver walkways and landscape. The northerly side yard will be a landscaped shallow swale area that will sheet flow to State Street. Small disconnected landscaped areas and planters will be located in the front yard area, inclufing a 70 square foot biofiltration planter in the southern portion of the front yard. The southerly side yard will be paved primarily with a permeable paver system. An area drain in the depressed lobby entry area at the southeast corner of the Site will drain to a sump that will discharge to the aforementioned biofiltration planter at the southeast corner of the
Site which will have and underdrain discharging to gutter flow in State Street. This gutter flow in State Street will then discharge to a tree well located in the right-of-way approximately 45 feet north
of the northerly boundary of the Site. A total of twelve (12) raised landscaped planters with a combined surface area of 818 square feet will be located on the second level podium deck of the structure and will function as a biofiltration planter for treatment of runoff from 16,256 s.f (approximately 90%) of the area of the roof, the exposed fourth floor walkway and most of the balconies on the 3rd and 4th floors of the structure. Does the project include grading and changes to site topography?
☒ Yes
☐ No
Description / Additional Information: The overall topography of the Site will not be substantially altered. Most of the ground floor level will consist of a parking level (covered by the structure) that will have a finished floor elevation about 4 feet below the current nominal finished grade of the Site. The finished grade at the exterior of the
garage level will be roughly at the current grade.
Grading for the project will result in removal of the clayey fill soils from the Site and replacement with select granular soils, resulting in a change of the effective Hydrologic Soil Group from Group “D” to Group “B”.
Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)?
☒ Yes
☐ No
Description / Additional Information:
The planned development of the Site will not significantly alter the overall drainage pattern, with
essentially all the runoff continuing to discharge to State Street. However, existing discharge to the
adjacent property to the north will be eliminated. Runoff from most of the Site will be captured in
private onsite drainage piping and discharge to an existing storm drain in State Street via a new
storm drain connection. Runoff from a depressed area in the southeastern portion of the Site (near
the planned lobby entrance) will be collected in a sump and discharged at a curb core to gutter flow.
Rain falling on the roof and upper floor balconies of the building will be directed to twelve (12)
biofiltration planters to be constructed on the second floor podium deck and another biofiltration at
the street level in the southeast corner of the Site.
The podium deck planters will have underdrains and risers that will connect to drain piping through
the building to a 10” storm drain pipe that will connect to an existing 66” RCP storm drain in State
Street that discharges to Buena Vista Lagoon at a point located approximately 300 feet from the
point of connection.
The street level biofiltration planter will have an underdrain connected to a sidewalk underdrain that
will discharge to the gutter in State Street. The gutter flow will be intercepted at an existing curb
inlet located approximately 225’ north of the northern site boundary. The existing curb inlet will be
modified by removing an existing debris rack and installing a proposed membrane filter drain insert.
Identify whether any of the following features, activities, and/or pollutant source areas will be
present (select all that apply):
☒ On-site storm drain inlets
☒ Interior floor drains and elevator shaft sump pumps
☒ Interior parking garages
☒ Need for future indoor & structural pest control
☒ Landscape/Outdoor Pesticide Use
☐ Pools, spas, ponds, decorative fountains, and other water features
☐ Food service
☒ Refuse areas
☐ Industrial processes
☐ Outdoor storage of equipment or materials
☐ Vehicle and Equipment Cleaning
☐ Vehicle/Equipment Repair and Maintenance
☐ Fuel Dispensing Areas
☐ Loading Docks
☒ Fire Sprinkler Test Water
☒ Miscellaneous Drain or Wash Water
☒ Plazas, sidewalks, and parking lots
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 will include:
(a) a small amount of gutter flow in State Street and flows to the northwest, where it enters existing
storm drain piping at a curb inlet on the westerly side of State Street approximately 250 feet
northwest of the Site. The storm drain is a 66” pipe that discharges to Buena Vista Lagoon
approximately 80 feet northeast of the curb inlet.
(b) flows in a 10” storm drain that will connected directly to the 66” storm drain pipe and discharge
to Buena Vista Lagoon
List any 303(d) impaired water bodies within the path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable), identify the pollutant(s)/stressor(s) causing impairment, and identify any TMDLs for the impaired water bodies:
303(d) Impaired Water Body Pollutant(s)/Stressor(s) TMDLs
Buena Vista Lagoon Indicator bacteria, nutrients, sedimentation/siltation NA
Identification of Project Site Pollutants
Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see BMP Design Manual Appendix B.6):
Pollutant
Not Applicable to the Project Site
Anticipated from the Project Site
Also a Receiving Water Pollutant of Concern
Sediment
Nutrients
Heavy Metals
Organic Compounds
Trash & Debris
Oxygen Demanding Substances
Oil & Grease
Bacteria & Viruses
Pesticides
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.
☐ No, the project will discharge runoff directly to existing underground storm drains
discharging directly to water storage reservoirs, lakes, enclosed embayments, or the
Pacific Ocean. ☐ No, the project will discharge runoff directly to conveyance channels whose bed and bank
are concrete-lined all the way from the point of discharge to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean. ☒ No, the project will discharge runoff directly to an area identified as appropriate for an exemption by the WMAA for the watershed in which the project resides. Description / Additional Information (to be provided if a 'No' answer has been selected above): Runoff from the Site to State Street is conveyed by the MS4 to Buena Vista Lagoon, which is
an exempt water body per the Carlsbad WMA WQIP.
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 ☒ No, No critical coarse sediment yield areas to be protected based on WMAA maps
If yes, have any of the optional analyses presented in Section 6.2 of the BMP Design Manual been performed? ☐ 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite ☐ 6.2.2 Downstream Systems Sensitivity to Coarse Sediment ☐ 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite ☐ No optional analyses performed, the project will avoid critical coarse sediment yield
areas identified based on 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
☐ Critical coarse sediment yield areas exist but additional analysis has determined
that protection is not required. Documentation attached in Attachment 8 of the SWQMP.
☐ Critical coarse sediment yield areas exist and require protection. The project will
implement management measures described in Sections 6.2.4 and 6.2.5 as applicable, and the areas are identified on the SWQMP Exhibit. Discussion / Additional Information:
Flow Control for Post-Project Runoff* *This Section only required if hydromodification management requirements apply
List and describe point(s) of compliance (POCs) for flow control for hydromodification management (see Section 6.3.1). For each POC, provide a POC identification name or number correlating to the project's HMP Exhibit and a receiving channel identification name or number
correlating to the project's HMP Exhibit. Not Applicable
Has a geomorphic assessment been performed for the receiving channel(s)? ☐ No, the low flow threshold is 0.1Q2 (default low flow threshold) ☐ Yes, the result is the low flow threshold is 0.1Q2 ☐ Yes, the result is the low flow threshold is 0.3Q2 ☐ Yes, the result is the low flow threshold is 0.5Q2
If a geomorphic assessment has been performed, provide title, date, and preparer: Not Applicable
Discussion / Additional 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 project is conditioned to replace a sewer main and a water main in easements on the adjacent property to the north. This will require removal and replacement of approximately 1,100 square feet of existing impervious surface (driveway, curb and trash enclosure) on the adjacent private property.
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.
E-36 Page 1 of 4 Revised 09/16
Development Services
Land Development Engineering
1635 Faraday Avenue
(760) 602-2750
www.carlsbadca.gov
STANDARD PROJECT
REQUIREMENT
CHECKLIST
E-36
Project Information
Project Name:
Project ID:
DWG No. or Building Permit No.:
Source Control BMPs
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 (Volume 5 of City Engineering Standards) for information to
implement source control BMPs shown in this checklist.
Answer each category below pursuant to the following.
"Yes" means the project will implement the source control BMP as described in Chapter 4 and/or Appendix E.1 of the
Model BMP Design Manual. Discussion/justification is not required.
"No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be
provided. Please add attachments if more space is needed.
"N/A" means the BMP is not applicable at the project site because the project does not include the feature that is
addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion/justification may be
provided.
Source Control Requirement Applied?
SC-1 Prevention of Illicit Discharges into the MS4 Yes No N/A
Discussion/justification if SC-1 not implemented:
SC-2 Storm Drain Stenciling or Signage Yes No N/A
Discussion/justification if SC-2 not implemented:
SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind
Dispersal Yes No N/A
Discussion/justification if SC-3 not implemented:
Ocean Condiminiums
CT 16-02 / RP 16-08
519-5A
E-36 Page 2 of 4 Revised 09/16
Source Control Requirement (continued) Applied?
SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and
Wind Dispersal Yes No N/A
Discussion/justification if SC-4 not implemented:
SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal Yes No N/A
Discussion/justification if SC-5 not implemented:
SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and
identify additional BMPs. (See Table in Appendix E.1 of BMP Manual for guidance).
On-site storm drain inlets Yes No N/A
Interior floor drains and elevator shaft sump pumps Yes No N/A
Interior parking garages Yes No N/A
Need for future indoor & structural pest control Yes No N/A
Landscape/Outdoor Pesticide Use Yes No N/A
Pools, spas, ponds, decorative fountains, and other water features Yes No N/A
Food service Yes No N/A
Refuse areas Yes No N/A
Industrial processes Yes No N/A
Outdoor storage of equipment or materials Yes No N/A
Vehicle and Equipment Cleaning Yes No N/A
Vehicle/Equipment Repair and Maintenance Yes No N/A
Fuel Dispensing Areas Yes No N/A
Loading Docks Yes No N/A
Fire Sprinkler Test Water Yes No N/A
Miscellaneous Drain or Wash Water Yes No N/A
Plazas, sidewalks, and parking lots Yes No N/A
For “Yes” answers, identify the additional BMP per Appendix E.1. Provide justification for “No” answers.
E-36 Page 3 of 4 Revised 09/16
Site Design BMPs
All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See
Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual (Volume 5 of City Engineering Standards) 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.
Site Design Requirement Applied?
SD-1 Maintain Natural Drainage Pathways and Hydrologic Features Yes No N/A
Discussion/justification if SD-1 not implemented:
SD-2 Conserve Natural Areas, Soils, and Vegetation Yes No N/A
Discussion/justification if SD-2 not implemented:
SD-3 Minimize Impervious Area Yes No N/A
Discussion/justification if SD-3 not implemented:
SD-4 Minimize Soil Compaction Yes No N/A
Discussion/justification if SD-4 not implemented:
SD-5 Impervious Area Dispersion Yes No N/A
Discussion/justification if SD-5 not implemented:
There is minimal existing vegetation on the Site. Trees along northerly property boundary will need to be removed to
replace a sewer main per the project conditions.
The entire site will be graded to prepare the subgrade for the planned 4-story structure. All fill will need to be compacted to
90% relative compaction to provide suitable bearing capacity as per the project geotechnical recommendations
There are no natural drainage pathway or other hydrologic features at the site.
E-36 Page 4 of 4 Revised 09/16
Site Design Requirement (continued) Applied?
SD-6 Runoff Collection Yes No N/A
Discussion/justification if SD-6 not implemented:
SD-7 Landscaping with Native or Drought Tolerant Species Yes No N/A
Discussion/justification if SD-7 not implemented:
SD-8 Harvesting and Using Precipitation Yes No N/A
Discussion/justification if SD-8 not implemented:
Demand for harvested water for irrigation and other onsite use is insufficient to make harvesting and use a feasible option.
Use of biofiltration planters on the podium deck will make use of a portion of the runoff for landscape purposes.
Narrative Discussion of Source Control BMPS
The following paragraphs summarize source control BMPs associated with the potential pollutant sources identified under item SC-6 of Form E-36. A. Onsite storm drain inlets – There will be a number on onsite area drain inlets including arra drain inlets in hardscape areas and a channel drain at the base of the drive entrance ramp. All of these locations are indicated on the grading plans. All of the inlets will be marked with “No Dumping” Flows to Bay” (or similar) stencils,
placards or signs that will be maintained for legibility. Storm water pollution prevention information will be included on HOA documents and owner information packages. B. Interior floor drains and elevator shaft sump pumps- The building will have an elevator. A sump pump in the elevator shaft will be plumbed to sanitary sewer. The sump pump will be inspected and maintained regularly to ensure proper operation. The building wall alsdo have an interior floor drain in the trash storage
room as discussed under item “G” below. C. Interior parking garages - The partially subterranean garage level of the structure will have a small catch basin to collect incidental water that will be plumbed to a sand-oil separator (clarifier) beneath the garage floor. The clarifier will be plumbed to discharge to the storm sewer as directed by City of Carlsbad. The clarifier will be inspected and maintained regularly to ensure proper operation.
D1. Need for future indoor & structural pest control - Integrated Pest Management (IMP) information will be provided to owners, lessees, and operators. D2. Landscape/Outdoor Pesticide Use – The proposed development will remove all existing trees, shrubs and ground cover from the Site. The proposed landscaping (except for biofiltration planters) will be designed
to feature drought-tolerant species to minimize irrigation and runoff, to promote surface infiltration where appropriate, and to minimize the use of fertilizers and pesticides that can contribute to storm water pollution. Landscape plans for the biofiltration planters will specify plants that are tolerant of periodic saturated soil conditions. The landscape plan will specify plants that are appropriate to site soils, slopes, climate, sun, wind, rain, land use, air movement, ecological consistency, and plant interactions and will consider using pest-resistant plants, especially adjacent to hardscape.
G. Refuse areas - Site refuse and recycled materials will be handled and stored for pickup in an indoor trash storage room at the covered garage level of the building as shown on the plans. A floor drain in the trash room will be plumbed to the clarifier below the garage floor. Signs will be posted on or near dumpsters with the
words “Do not dump hazardous materials here” (or similar). The trash storage room will have the required number of covered receptacles for trash and recycled waste based on occupancy load. The receptacles will be
inspected regularly and replaced of they are found to be leaky. The trash storage room will be cleaned regularly as part of routine building maintenance. Spill control materials will be available in the storage room. N. Fire Sprinkler Test Water - Fire sprinkler test water will be drained to the channel drain at the garage
entrance from where it will subsequently be discharged to a biofiltration planter via a sump pump. O. Miscellaneous Drain or Wash Water - Miscellaneous drain or wash water sources for the project will include: condensate drain lines; rooftop equipment; a drainage sump, and; roofing, gutters, and trim. All condensate drain lines from air conditioning units will be plumbed to discharge to landscaped areas and/or biofiltrartion planters. Other ooftop mounted equipment with potential to produce pollutants shall be roofed and/or have secondary containment. The drainage sump at the southeast corner of the Site will have a sediment sump to reduce the quantity of sediment in pumped water and will discharge to a biofiltration planter. Roofing, gutters, and trim made will not be made of copper or other unprotected metals.
SUMMARY OF PDP STRUCTURAL BMPS
PDP Structural BMPs
All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of the BMP Design Manual). Selection of PDP structural BMPs for storm water pollutant control must be based on
the selection process described in Chapter 5. PDPs subject to hydromodification management requirements must also implement structural BMPs for flow control for hydromodification management
(see Chapter 6 of the BMP Design Manual). Both storm water pollutant control and flow control for hydromodification management can be achieved within the same structural BMP(s).
PDP structural BMPs must be verified by the City at the completion of construction. This may include requiring the project owner or project owner's representative to certify construction of the structural BMPs
(see Section 1.12 of the BMP Design Manual). PDP structural BMPs must be maintained into perpetuity, and the City must confirm the maintenance (see Section 7 of the BMP Design Manual).
Use this form to provide narrative description of the general strategy for structural BMP implementation
at the project site in the box below. Then complete the PDP structural BMP summary information sheet for each structural BMP within the project (copy the BMP summary information page as many times as
needed to provide summary information for each individual structural BMP).
Describe the general strategy for structural BMP implementation at the site. This information must describe how the steps for selecting and designing storm water pollutant control BMPs presented in
Section 5.1 of the BMP Design Manual were followed, and the results (type of BMPs selected). For projects requiring hydromodification flow control BMPs, indicate whether pollutant control and flow
control BMPs are integrated together or separate. The strategy for structural BMP implementation adopted in this plan follows the strategy and general design in the plan that was approved as part of the discretionary review of the project. Self-Retaining DMAs At the ground level, runoff will primarily be managed by routing to self-retaining areas in the northerly and southerly side yards. DMA 01 is a self-retaining area that includes the landscaped rear yard, the landscaped northerly side yard, the landscaped northeasterly front yard area and a permeable paver walkway in the northeast portion of the site. Runoff from an isolated rooftop area at the northeast corner of the structure, a small upper floor balcony area and podium deck patios on the north and west sides of the structure totaling 1,172 s.f. will discharge to this area. The impervious-to-pervious area ratio of DMA 01 is 0.78:1. DMA 02 is a self-retaining area that consists of permeable pavers in the southerly side yard, the ADA ramp in the southerly portion of the front yard and small impervious areas including concrete
stairs and a small portion of the podium deck that will drain to the permeable pavers. Isolated areas of the structure totaling approximately 58 s.f. will also discharge to DMA 02. The impervious-to-pervious area ratio of DMA 02 is 0.06:1 (based on the ground floor pervious area, some of which is overhung by roof elements) It is noted that the existing subgrade soils at the site are dominated by clayey fill soils that are categorized as Hydrologic Group D. The project proposes remedial grading that will remove these soils and replace them with imported fill that will be Hydrologic Group B soils. The proposed permeable paver walkways on the southerly portion of the site are considered as a site design BMP to reduce the DCV. The basement wall for the parking level will be waterproofed to minimize the potential for water intrusion into the proposed partially subterranean garage-level storage and utility areas.
[Continued from previous page]
Self-Mitigating DMAs
DMA 03 consists of a small (10 sq. ft.) isolated planter area in the front yard. DMA 04 consists of a 90 s.f. area of landscape along the southerly property boundary above a retaining wall in the easterly half of the south side yard.
All landscaped area will be planted with drought tolerant native species that do not require regular application of fertilizers or pesticides. The soil in these areas will be amended and aerated to promote water retention characteristics equivalent to undisturbed native soil. Onsite DMAs Routed to Pollutant Control BMPs DMA 06 consists of an area of approximately 835 s.f. in the southeastern corner of the Site that includes PCC and permeable paver pavement in walkways, a roof “eyebrow” detail, exposed upper floor balconies and approximately 260 s.f. of PCC pavement in the drive entrance outside the building footprint. The driveway ramp slopes down to the garage level and is contiguous with another 488 s.f. portion of the drive entrance that is covered (within the building footprint). This plan proposes to intercept the runoff from the drive entrance ramp in a channel drain at the base of
the ramp that will discharge to a sump and sump pump from which the water will be discharged to a biofiltration planter (BIO.09). The planter will have an underdrain that will connect to a sidewalk underdrain to discharge to the gutter on State Street. This treated discharge will subsequently be intercepted by a tree well located approximately 45 feet north of the northerly boundary of the parcel. DMAs 08 through 15 include all of the impervious rooftop, roof deck and upper floor balconies from which runoff will be routed to the podium deck biofiltration planters. Lined biofiltration planters have been specified rather than biofiltration basins based on the limited area outside the building footpring and on geotechnical conditions. Remedial grading of the site will replace relatively impermeable and highly expansive site soils with more permeable select fill, which could potentially make biofiltration basins feasible. However, the geotechnical engineer has opined that while the recommended import soils may possess favorable infiltration rates with respect to stormwater
BMPs in general, collection and transfer of stormwater runoff to limited areas for concentrated infiltration in volumes exceeding that which would occur through natural precipitation or controlled irrigation could result in: a) a perched water and saturated condition at the bottom of the select fill soils, and; b) vertical and lateral migration of subsurface waters, which could adversely impact onsite and adjacent offsite improvements through saturation and volume changes in expansive soils (i.e. expansion and contraction). Based on these considerations, the use of infiltration-based BMPs (such as infiltration basins) as pollutant control BMPs that are intended to infiltrate concentrated quantities of stormwater into the underlying soils are not recommended for the Site. A general routing diagram illustrating how runoff from structure surfaces will be routed to the biofiltration planters is provided on Exhibit DMA-2. Drainage patterns and the locations of roof area draina and downdrains that will route the runoff to the planters are also indicated on the exhibit. Details of how the roof drains will be plumbed are to be provided in the architectural plans.
Discharge from the biofiltration planters will be from perforated PVC underdrain pipes and 6” PVC risers that will connect to a common 6” PVC pipe mounted on the bottom of the concrete podium deck (i.e., ceiling of the garage level). The 6” PVC pipe will connect to a proposed 10” PVC storm drain beneath the northerly side yard that will be connected directly to an existing 66” RCP storm drain in the State Street right-of-way.
The aforementioned 66” storm drain discharges directly to Buena Vista Lagoon at a point approximately 300 feet northeast of the Site.
Offsite DMAs
There are two offsite DMAs. DMA 05 consists of approximately 1,650 square feet of impervious AC pavement, PCC pavement for sidewalk, the onsite driveway entrance, an offsite driveway entrance (2333 State Street), curb and gutter, and minor landscaped areas within the public right-of-way that will be replaced along the project frontage on State Street. Runoff from this area will flow to the north as gutter flow and will be intercepted by an existing curb inlet with a proposed curb inlet multi-level screen filter (CI.01) located about 225 feet north of the northerly property boundary. DMA 07 consists of 2,233 square feet of land that will be disturbed in connection with replacement of water and sewer mains in public rights of way on the adjacent parcel. The disturbed area in the easements will include replacement of AC pavement in a driveway, PCC curb and PCC pavement for an existing trash enclosure. The total of replaced impervious surface in DMA 07 is 1,154 square
feet. The remaining 1,1079 square feet within DMA 07 will be landscaped area above the grade of the replaced pavement. This DMA consists entirely of land in public easements of private property owned by others. Based on this and the drainage patters within the DMA it is not feasible to capture or treat the runoff form DMA 07.
Structural BMP Summary Information
Structural BMP ID No. BIO.01A
DWG 519-5A Sheet No. 5 and 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or r biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed): BIO.01A is a biofiltration planter located on a podium deck patio area adjacent to the northerly side
yard. The planter will have a 6” thick gravel drainage layer (4.5” gravel with 1.5” pea gravel choker layer) and 18” thick bioretention soil media layer. The planter will have a surface area of 90 square
feet and allow for 6” ponding depth. The total storage (detention) capacity of BIO.01A will be 110 cubic feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a
6” PVC discharge pipe that will connect directly to a 10” PVC storm drain pipe beneath the landscaped northerly side yard. The 10” storm drain line will discharge to an existing 66” RCP storm
drain in State Street.
BIO.01A is intended accept runoff from 2,992 s.f. of of impervious roof/roof deck and exposed upper floor balcony area in the northeasterly portion of the building.
Structural BMP Summary Information
Structural BMP ID No. BIO.01B
DWG 519-5A Sheet No. 5 and 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
BIO.01B is a small biofiltration planter located on a podium deck patio area adjacent to the northerly side yard. The planter will have a 6” thick gravel drainage layer (4.5” gravel with 1.5” pea gravel
choker layer) and 18” thick bioretention soil media layer. The planter will have a surface area of 18 square feet and allow for 6” ponding depth. The total storage (detention) capacity of BIO.01B will be
22 cubic feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a 6” PVC discharge pipe that will connect directly to a 10” PVC storm drain pipe beneath the
landscaped northerly side yard. The 10” storm drain line will discharge to an existing 66” RCP storm drain in State Street.
BIO.01B is intended accept runoff from 286 s.f. of of impervious roof and upper floor balcony area in
the north-central portion of the building.
Structural BMP Summary Information
Structural BMP ID No. BIO.01C
DWG 519-5A Sheet No. 5 and 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
BIO.01C is a small biofiltration planter located on a podium deck patio area adjacent to the northerly side yard. The planter will have a 6” thick gravel drainage layer (4.5” gravel with 1.5” pea gravel
choker layer) and 18” thick bioretention soil media layer. The planter will have a surface area of 34 square feet and allow for 6” ponding depth. The total storage (detention) capacity of BIO.01C will be
42 cubic feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a 6” PVC discharge pipe that will connect directly to a 10” PVC storm drain pipe beneath the
landscaped northerly side yard. The 10” storm drain line will discharge to an existing 66” RCP storm drain in State Street.
BIO.01C is intended accept runoff from 725 s.f. of of impervious roof and upper floor balcony area in
the north-central portion of the building.
Structural BMP Summary Information
Structural BMP ID No. BIO.01D
DWG 519-5A Sheet No. 5 and 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
BIO.01D is a biofiltration planter located on a patio area at the northwest corner opf the podium deck level of the building. The planter will have a 6” thick gravel drainage layer (4.5” gravel with 1.5” pea
gravel choker layer) and 18” thick bioretention soil media layer. The planter will have a surface area of 94 square feet and allow for 6” ponding depth. The total storage (detention) capacity of BIO.01D
will be 115 cubic feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a 6” PVC discharge pipe that will connect directly to a 10” PVC storm drain pipe beneath the
landscaped northerly side yard. The 10” storm drain line will discharge to an existing 66” RCP storm drain in State Street.
BIO.01D is intended accept runoff from 2,774 s.f. of of impervious roof and upper floor balcony area
in the northwestern portion of the building.
Structural BMP Summary Information
Structural BMP ID No. BIO.02
DWG 519-5A Sheet No. 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed): BIO.02 is a biofiltration planter on the south-central edge of 2nd story concrete podium deck. The
facility will have a 6” thick gravel drainage layer, 2” thick choker course and 18” thick bioretention soil media layer. The planter will have a surface area of 216 square feet and allow for a 10” ponding
depth. The total storage (detention) capacity of BIO.02 will be 351 cubic feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a 6” PVC discharge pipe that will connect to a 6” PVC collector pipe mounted on the bottom of the
podium deck (ceiling of garage level). The collector pipe will connect to a 10” PVC storm drain pipe beneath the landscaped northerly side yard that will discharge to an existing 66” RCP storm drain in
State Street.
BIO.02 is intended accept runoff from 763 s.f. of of impervious surfaces including rooftops of two stairwell/elevator penthouses on the southeast and southwest portions of the roof and concrete
walkways on the south-central portion of the fourth floor that are open to the sky.
BIO.02 is significantly oversized with respect to the DCV required for pollutant control and will provide detention volume to reduce the peak discharge from the proposed site development for the 100-year
storm event to less than existing peak discharge.
Structural BMP Summary Information
Structural BMP ID No. BIO.03
DWG 519-5A Sheet No. 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
BIO.03 is a biofiltration planter on south-central portion of the 2nd story concrete podium deck. The facility will have a 6” thick gravel drainage layer (4.5” of ¾” gravel and 1.5” of 3/8” choker course)
and 18” thick bioretention soil media layer. The planter will have a surface area of 101 square feet and allow for a 6” ponding depth. The total storage (detention) capacity of BIO.03 will be 124 cubic
feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a 6” PVC discharge pipe that will connect to a 6” PVC collector pipe mounted on the bottom of the
podium deck (ceiling of garage level). The collector pipe will connect to a 10” PVC storm drain pipe beneath the landscaped northerly side yard that will discharge to an existing 66” RCP storm drain in
State Street.
BIO.03 is intended accept runoff from 1,612 s.f. of impervious surface on the south-central portion roof deck and concrete walkways on the fourth floor that are open to the sky.
Structural BMP Summary Information
Structural BMP ID No. BIO.04
DWG 519-5A Sheet No. 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
BIO.04 is a biofiltration planter on the southeastern portion of the 2nd story concrete podium deck. The facility will have a 6” thick gravel drainage layer (4.5” of ¾” gravel and 1.5” of 3/8” choker course)
and 18” thick bioretention soil media layer. The planter will have a surface area of 92 square feet and allow for a 6” ponding depth. The total storage (detention) capacity of BIO.04 will be 113 cubic
feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a 6” PVC discharge pipe that will connect to a 6” PVC collector pipe mounted on the bottom of the
podium deck (ceiling of garage level). The collector pipe will connect to a 10” PVC storm drain pipe beneath the landscaped northerly side yard that will discharge to an existing 66” RCP storm drain in
State Street.
BIO.04 is intended accept runoff from 3,030 s.f. of impervious roof/roof deck surface.
Structural BMP Summary Information
Structural BMP ID No. BIO.05
DWG 519-5A Sheet No. 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
BIO.05 is a biofiltration planter in the south-central portion of the 2nd story concrete podium deck. The facility will have a 6” thick gravel drainage layer (4.5” of ¾” gravel and 1.5” of 3/8” choker course)
and 18” thick bioretention soil media layer. The planter will have a surface area of 77 square feet and allow for a 6” ponding depth. The total storage (detention) capacity of BIO.05 will be 94 cubic
feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a 6” PVC discharge pipe that will connect to a 6” PVC collector pipe mounted on the bottom of the
podium deck (ceiling of garage level). The collector pipe will connect to a 10” PVC storm drain pipe beneath the landscaped northerly side yard that will discharge to an existing 66” RCP storm drain in
State Street.
BIO.05 is intended accept runoff from 1,755 s.f. of impervious roof/roof deck surface on the north-central portion of the building.
Structural BMP Summary Information
Structural BMP ID No. BIO.06
DWG 519-5A Sheet No. 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
BIO.06 is a small biofiltration planter on the south-central portion of the 2nd story concrete podium deck. The facility will have a 6” thick gravel drainage layer (4.5” of ¾” gravel and 1.5” of 3/8” choker
course) and 18” thick bioretention soil media layer. The planter will have a surface area of 16 square feet and allow for a 6” ponding depth. The total storage (detention) capacity of BIO.06 will be 20
cubic feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a 6” PVC discharge pipe that will connect to a 6” PVC collector pipe mounted on the bottom of the
podium deck (ceiling of garage level). The collector pipe will connect to a 10” PVC storm drain pipe beneath the landscaped northerly side yard that will discharge to an existing 66” RCP storm drain in
State Street.
BIO.06 is intended accept runoff from 515 s.f. of impervious roof/roof deck surface in the southwestern portion of the building.
Structural BMP Summary Information
Structural BMP ID No. BIO.07
DWG 519-5A Sheet No. 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
BIO.07 is a small biofiltration planter on the west-central portion of the 2nd story concrete podium deck. The facility will have a 6” thick gravel drainage layer (4.5” of ¾” gravel and 1.5” of 3/8” choker
course) and 18” thick bioretention soil media layer. The planter will have a surface area of 56 square feet and allow for a 6” ponding depth. The total storage (detention) capacity of BIO.07 will be 69
cubic feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a 6” PVC discharge pipe that will connect to a 6” PVC collector pipe mounted on the bottom of the
podium deck (ceiling of garage level). The collector pipe will connect to a 10” PVC storm drain pipe beneath the landscaped northerly side yard that will discharge to an existing 66” RCP storm drain in
State Street.
BIO.07 is intended accept runoff from 1,863 s.f. of impervious roof/roof deck surface on the southwestern portion of the building and a small portion of the exposed 4th story walkway.
Structural BMP Summary Information
Structural BMP ID No. BIO.08
DWG 519-5A Sheet No. 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
BIO.08 is a small biofiltration planter on the west-central portion of the 2nd story concrete podium deck. The facility will have a 6” thick gravel drainage layer (4.5” of ¾” gravel and 1.5” of 3/8” choker
course) and 18” thick bioretention soil media layer. The planter will have a surface area of 24 square feet and allow for a 6” ponding depth. The total storage (detention) capacity of BIO.07 will be 29
cubic feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a 6” PVC discharge pipe that will connect to a 6” PVC collector pipe mounted on the bottom of the
podium deck (ceiling of garage level). The collector pipe will connect to a 10” PVC storm drain pipe beneath the landscaped northerly side yard that will discharge to an existing 66” RCP storm drain in
State Street.
BIO.08 is intended accept runoff from 180 s.f. of impervious surface on a small portion of the exposed 4th story walkway.
Structural BMP Summary Information
Structural BMP ID No. BIO.09
DWG 519-5A Sheet No. 5 and 8
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☐ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
BIO.09 is a biofiltration planter at street level in the southeastern corner of the Site. The facility will have a 6” thick gravel drainage layer (4.5” of ¾” gravel and 1.5” of 3/8” choker course) and 18” thick
bioretention soil media layer. The planter will have a surface area of 70 square feet and allow for a 6” ponding depth. The total storage (detention) capacity of BIO.09 will be 86 cubic feet of water.
The drainage layer will have a 4” perforated PVC pipe underdrain connected to a 6” riser/weir and a
3” PVC discharge pipe that will connect to sidewalk underdrain (per SDRSD D-27) that will discharge to the gutter in State Street.
BIO.09 is intended accept runoff from 557 s.f. of impervious surface on upper level balconies and a
“eyebrow” roof detail at the southeast corner of the building.
Structural BMP Summary Information
Structural BMP ID No. CI.01
DWG 519-5 Sheet No. 3
Type of structural BMP:
☐ Retention by harvest and use (HU-1)
☐ Retention by infiltration basin (INF-1)
☐ Retention by bioretention (INF-2)
☐ Retention by permeable pavement (INF-3)
☐ Partial retention by biofiltration with partial retention (PR-1)
☐ Biofiltration (BF-1)
☐ Flow-thru treatment control included as pre-treatment/forebay for an onsite
retention or biofiltration BMP (provide BMP type/description and indicate which
onsite retention or biofiltration BMP it serves in discussion section below)
☐ Detention pond or vault for hydromodification management
☒ Other (describe in discussion section below)
Purpose:
☒ Pollutant control only
☐ Hydromodification control only
☐ Combined pollutant control and hydromodification control
☐ Pre-treatment/forebay for another structural BMP
☐ Other (describe in discussion section below)
Discussion (as needed):
CI.01 is a multi-level screen curb inlet filter to be installed in an existing Type B curb inlet located in
the right-of-way approximately 225 feet north of the northerly property boundary. The proposed filter
is a Bio Clean Curb Inlet Filter consisting of an insertable curb inlet basin filter system designed to
capture fine to coarse sediments, floatable trash, debris, and other pollutants conveyed in stormwater
runoff. The proposed filter system is a multi-level screen. The system with the multi-level screen
addresses a wide array of pollutants including trash and debris, sediments, TSS, nutrients, metals,
and hydrocarbons. Sediment and nutrients are pollutants of concern for the receiving waters.
The filter insert system includes an expandable trough installed in the curb inlet that is designed to
convey water quality design flows through the filter basket while allowing peak flows to bypass over
the trough without resuspending captured pollutants.
CI.01 is intended accept runoff from approximately 1,650 s.f. of replaced impervious AC and PCC
pavement and minor landscaped areas in the right-of-way along the project frontage of State Street.
It is noted that a planned sump at the lobby entrance will discharge flow from a channel drain at the
drive entrance (DMA 06) and possible underflow from the permeable paver walkway in the southerly
side yard (DMA 02) to a biofiltration planter (BIO.09) that will in turn discharge to the State Street
gutter via a sidewalk underdrain. Treated discharge from biofiltration planter BIO.09 will be
intercepted by the curb inlet. The treated discharge from the sump/biofiltration planter that will flow
to the curb inlet following the “first flush” from a storm event was considered in sizing calculations for
CI.01.
The proposed filter insert has a media treatment flow capacity of 2.85 cfs and unlimited bypass flow
capacity. The calculated design flow for the Site DMA’s discharging to the inlet is 0.015 cfs.
ATTACHMENT 1 BACKUP FOR PDP POLLUTANT CONTROL BMPS
This is the cover sheet for Attachment 1. Check which Items are Included behind this cover sheet: Attachment Sequence Contents Checklist
Attachment 1a DMA Exhibit (Required)
See DMA Exhibit Checklist on the back of this Attachment cover sheet. (24”x36” Exhibit typically required)
☒ Included
Attachment 1b Tabular Summary of DMAs Showing DMA ID matching DMA Exhibit, DMA Area, and DMA Type (Required)* *Provide table in this Attachment OR on DMA Exhibit in Attachment 1a
☒ Included on DMA Exhibit in
Attachment 1a ☐ Included as Attachment 1b,
separate from DMA Exhibit
Attachment 1c Form I-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 I-7.
☒ Included
☐ Not included because the entire
project will use infiltration BMPs
Attachment 1d Form I-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 I-8.
☒ Included
☒ Not included because the
entire project will use harvest
and use BMPs
Attachment 1e Pollutant Control BMP Design Worksheets / Calculations (Required)
Refer to Appendices B and E of the BMP Design Manual for structural pollutant control BMP design
guidelines
☒ Included
Use this checklist to ensure the required information has been included on the DMA Exhibit: The DMA Exhibit must identify:
☒ Underlying hydrologic soil group
☒ Approximate depth to groundwater
☒ Existing natural hydrologic features (watercourses, seeps, springs, wetlands)
☒ Critical coarse sediment yield areas to be protected (if present)
☒ Existing topography and impervious areas
☒ Existing and proposed site drainage network and connections to drainage offsite
☒ Proposed grading
☒ Proposed impervious features
☒ Proposed design features and surface treatments used to minimize imperviousness
☒ Drainage management area (DMA) boundaries, DMA ID numbers, and DMA areas
(square footage or acreage), and DMA type (i.e., drains to BMP, self-retaining, or self-mitigating)
☒ Structural BMPs (identify location and type of BMP)
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19EXISTING SITE CONDITIONSPROPOSED GROUND FLOOR BMPs AND DRAINAGETAYLOR GROUP, INC.
DMA EX+IBIT GROUND LE9EL
OCEAN CONDOMINIUMS
2501 STATE STREET, CARLSBAD, CA
APN 1552001000DMA1SHEET NUMBER:301 Mission Avenue Suite 201
Oceanside California 92054
tel. 760.721.9990 fax. 760.721.9991
www.visitTGI.com
Geotechnical Engineering Civil EngineeringtgiREGISTERE
D
PROFESSIONAL ENGINEERCIVILLAR
RY
RUSSEL TAYLORSTATE OF CALI
FOR
NIA No. 58274Exp. 06.30.2022SITE INFORMATIONLEGENDITEM/DESCRIPTION SYMBOL01
STATE STREETWWWWWW WWTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTWWWWGGGGGGGGGGGGGA
7
A
7
G
7
301 Mission Avenue Suite 201
Oceanside California 92054
tel. 760.721.9990 fax. 760.721.9991
www.visitTGI.com
Geotechnical Engineering Civil Engineering
TAYLOR GROUP, INC.
DMA EXHIBIT - GROUND LEVEL DETAILS
OCEAN CON'O0INIU0S
STATE STREET, CARLSBA', CA
APN '0ASHEET NUMBER:REGISTERE
D
PROFESSIONAL ENGINEERCIVILLAR
RY
RUSSEL TAYLORSTATE OF CALI
FOR
NIA No. 58274Exp. 06.30.2022DETAIL )OR BIO)ILTRATIN 3LANTER BIO T<3I&AL 3ERMEABLE 3AVER SE&TIONDETAIL O) BIO AND DRAINAGE AT BUILDING ENTRAN&E3LANTER :ALL O3EN -OINT:EE3HOLEDRAINAGE TO 3AVER BASEELEVATIONSE&TION X-XtgiFOR USE IN CURB INLETS WITH WINGSBIO &LEAN MODEL BIO-&URB-MLS-S &URB INLET S&REENING )ILTER :ITH TROUGH S<STEM
FMFMFM FM FM FM FM FM FM FM FM FM FMFMFMFM FMSSSEEEEEEEEEEETTTWW WWWWWWWWWWWWWWWWTTTTTTTTTTT T TTTTTTTTTTTTTTTEESWTTTTTTTTTTGGGGSSSSSSSSSSSSSSSSSSSSFMFMSSSGGGGGGWWWWWWWSSSSSSS15121308D11091408C08A08B0910AREAS DRAINING TO PODIUM DECK BIOFILTRATION PLANTERSTAYLOR GROUP, INC.
DMA E;HIBIT ROOFTOP
OCEAN CONDOMINIUMS
2501 STATE STREET, CARLSBAD, CA
APN 1552001000DMA3SHEET NUMBER:301 Mission Avenue Suite 201
Oceanside California 92054
tel. 760.721.9990 fax. 760.721.9991
www.visitTGI.com
Geotechnical Engineering Civil EngineeringtgiREGISTERE
D
PROFESSIONAL ENGINEERCIVILLAR
RY
RUSSEL TAYLORSTATE OF CALI
FOR
NIA No. 58274Exp. 06.30.2022SITE INFORMATIONLEGENDITEM/DESCRIPTIONSYMBOL01DETAIL FOR BIOFILTRATION PLANTER BIO.02SCHEMATIC DIAGRAM OF STORM WATER ROUTINGENGINEER'S NOTESDETAIL FOR BIOFILTRATION PLANTER BIO.03 T0 BIO.08
' .
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
1
2
3 4
5 6
1
2
3
4
5
6
FLOW-THRU DESIGN FLOW WORKSHEET
BMP Identification:
Description:
CI.01
Curb inlet filter insert (multi-level screen type) -Flow�!�r� �-e�sigri_ Fl?��, --Worksheet 8•6.1 I I I ,-� . • •• 'I DCV
DCV retained
DCV biofiltered
DCV requiring flow-thru (Line 1-Line 2 -0.67 x Line 3)
Adjustment factor (Line 4/Line 1 )*
Des,gn rainfall intensity
Area Tributary to BMP
Area-weighted runoff factor
Calculate flow rate -Afx(C x I xA)
.. DCV
DCVretalned
OCVblofiltered
DCV now-lhru
AF=
i=
A=
C=
Q=
OMA 02 CONTRIBUTION
851h percentile 24-hr storm depth from Fiaure B.1-1 d=
Area tributary to BMP (s) A=
Area weighted runoff factor (estimate using Appendix C=
Tree wells volume reduction TCV=
Rain barrels volume reduction RCV=
Calculate DCV = DCV=
OMA 05 CONTRIBUTION
851� oercentile 24-hr storm deoth from Fiaure B.1-1 d=
Area tributary to BMP (s) A=
Area weighted runoff factor (estimate using Appendix C=
Tree wells volume reduction TCV=
Rain barrels volume reduction RCV=
Calculate DCV = DCV=
OMA 06 CONTRIBUTION
851h oercentile 24-hr storm deoth from Fiaure B.1-1 d=
Area tributary to BMP (s) A=
Area weighted runoff factor (estimate using Appendix C=
Tree wells volume reduction TCV=
Rain barrels volume reduction RCV=
Calculate DCV = DCV=
114 cubic-feet
0 cubic-feet
0 cubic-feet
114 cubic-feet
1.00 unitless
0.20 in/hr
0.08 acres
0.90 unitless
0,015 cfs
0.58 inches
0.024 acre
0.24 unitless
2.00 cubic-feet
0.00 cubic-feet
10 cubic-feet
0.58 inches
0.038 acre
0.95 unitless
0.00 cubic-feet
0.00 cubic-feet
76 cubic-feet
0.58 inches
0.019 acre
0.70 unitless
0.00 cubic-feet
0.00 cubic-feet
28 cubic-feet
ATTACHMENT 3 Structural BMP Maintenance Information
Use this checklist to ensure the required information has been included in the Structural BMP Maintenance Information Attachment: Preliminary Design/Planning/CEQA level submittal: Attachment 3 must identify:
☒ Typical maintenance indicators and actions for proposed structural BMP(s) based
on Section 7.7 of the BMP Design Manual
Final Design level submittal: Attachment 3 must identify:
☒ Specific maintenance indicators and actions for proposed structural BMP(s). This
shall be based on Section 7.7 of the BMP Design Manual and enhanced to reflect actual proposed components of the structural BMP(s)
☒ How to access the structural BMP(s) to inspect and perform maintenance
☒ Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt posts, or other features that allow the inspector to view necessary components of the structural BMP and compare to maintenance thresholds)
☒ Manufacturer and part number for proprietary parts of structural BMP(s) when
applicable
☒ Maintenance thresholds for BMPs subject to siltation or heavy trash(e.g., silt level
posts or other markings shall be included in all BMP components that will trap and
store sediment, trash, and/or debris, so that the inspector may determine how full the BMP is, and the maintenance personnel may determine where the bottom of the BMP is . If required, posts or other markings shall be indicated and described on
structural BMP plans.)
☒ Recommended equipment to perform maintenance
☒ When applicable, necessary special training or certification requirements for
inspection and maintenance personnel such as confined space entry or hazardous waste management
BMP MAINTENANCE INFORMATION
A. O&M PLAN ADMINISTRATION, TRAINING AND RECORDKEEPING
A.1 Onsite BMPs
The operation and maintenance (O&M) of the onsite structural BMPs will be the responsibility of
the Ocean Condominiums homeowners association (HOA). Onsite structural BMPs consist of
biofiltration planters. Maintenance information for these facilities is provided in Section B of this
Attachment.
The current contact information for the responsible party is:
Carlsbad 17, LP
Attn: Richard Woolsey, Manager
234 Venture Street, Suite 100
San Marcos, CA 92078
(760) 497-1751
An O&M training program will be administered and implemented by the HOA and shall occur at a
minimum of once annually. The training program shall consist of, at a minimum: providing a copy
this SWQMP and a copy of the maintenance plan to all personnel associated with O&M for the
site. This might include contract personnel such as association management and contractors. A
training log shall be filled out at each training session and kept for a minimum of five (5) years.
The HOA will complete and maintain O&M forms to adequately document all maintenance
performed on the project's structural BMPs. These records should be kept on file for a minimum
of five (5) years and shall be made accessible for inspection upon request at any time to the City
of Carlsbad, the State Water Resources Control Board or any other authority regulating storm
water discharges.
All waste generated from the project site is ultimately the responsibility of the HOA. Disposal of
sediment, debris, and trash will comply with applicable local, county, state, and federal waste
control programs. Suspected hazardous waste will be analyzed to determine proper disposal
methods.
This Attachment provides information for each type of structural BMP used on this project. These
are minimum requirements only. Their frequency and/or scope may be increased, if necessary,
to meet and/or maintain the level of storm water quality treatment required of this project.
The project's owner will enter into a Stormwater Facility Maintenance Agreement as required by
the City of Carlsbad, which will be executed prior to grading permit issuance.
A.2 Offsite BMP
The project includes an offsite curb inlet filter insert that will be installed in an existing curb inlet
and maintained by the City. Maintenance information for this facility is provided in Section C of
this Attachment.
B. BIOFILTRATION FACILITIES
Biofiltration facilities are vegetated systems that filter water through vegetation and soil or
engineered media prior to discharge via underdrain or overflow to the downstream conveyance
system. Biofiltration facilities have limited or no infiltration. They are typically designed to provide
enough hydraulic head to move flows through the underdrain connection to the storm drain
system. Typical biofiltration components include:
• Inflow distribution mechanisms (e.g., perimeter flow spreader or filter strips)
• Energy dissipation mechanism for concentrated inflows (e.g., splash blocks or riprap)
• Shallow surface ponding for captured flows
• Side slope and basin bottom vegetation selected based on climate and ponding depth
• Non-floating mulch layer
• Media layer (planting mix or engineered media) capable of supporting vegetation growth
• Filter course layer consisting of aggregate to prevent the migration of fines into
uncompacted native soils or the aggregate storage layer
• Aggregate storage layer with underdrain(s)
• Impermeable liner or uncompacted native soils at the bottom of the facility
• Overflow structure
Biofiltration facilities for this project include biofiltration planters BIO.1 through BIO.08 located on
the podium deck (2nd level) of the building and BIO.9 at the street level in the southeast corner of
the site. All of the biofiltration planters on the podium deck are filly lined to prevent impacts on
the structure. The biofiltration planter at the street level is fully lined to prevent infiltration.
B.1 Access to Biofiltration BMPs
All of the biofiltration planters on the podium deck can be accessed for inspection and routine
maintenance via the building’s stair wells and elevator. Access to import and export materials for
corrective maintenance of the podium deck planters can also be via the southerly side yard of the
building with the aid of a lift or other means to move materials from the ground level to the podium
deck level.
The biofiltration planter at the street level can be accessed for inspection and routine maintenance
via the public sidewalk and private walkways that surround the planter. Access to the street level
planter for corrective maintenance can be via the sidewalk and public street.
B.2 Features to Facilitate Inspection
All of the biofiltration planters have overflow risers and cleanout risers to facilitate inspection of
the piping/underdrain systems.
B.3 Inspection
During the first year of normal operation the biofiltration BMPs shall be inspected by the
responsible party at least once before the start of the rainy season (between May 1 and
September 30) and then at least monthly from October 1 through April 30. Additionally, all of the
biofiltration systems shall be inspected after each storm event with rainfall exceeding 0.25 inches
to help determine if the structural BMPs are functioning properly.
After the year, the minimum inspection and maintenance frequency shall be as summarized in
Table B-1 below. The inspection frequencies listed in the table may be adjusted based on the
results of the first year inspections.
Table B-1. Minimum Inspection Frequency
Inspection Frequency
Inspect all biofiltration systems for the
following:
• Erosion of soil surface in planter
• Accumulation of debris and litter
• Accumulation of sediment
• Cleanouts and overflow inlets
• Dead vegetation
• Overgrown vegetation and weeds
• Mulch thickness and distribution
• Once between May 1 and September 30
• Bi-monthly between October 1 – April 30
• After a rainfall event of 0.5” or more
Inspect for standing water
96 hours after a rainfall event of 0.25” or more
The inspection items shall be evaluated based in the indicators discussed in the following section.
If the maintenance indicator threshold has been exceeded by the time the structural BMP is
inspected, the BMP has been operating at reduced capacity. This would mean it is necessary to
inspect and maintain the structural BMP more frequently.
B.4 Routine Maintenance
Biofiltration facilities require routine maintenance. Routine maintenance will help avoid more
costly rehabilitative maintenance to repair damages that may occur when BMPs have not been
adequately maintained on a routine basis. The optimum maintenance frequency is each time
the maintenance threshold for removal of materials (sediment, trash, debris or overgrown
vegetation) is met.
The minimum inspection and maintenance frequency is annual and must be reported annually.
The need for maintenance depends on the amount and quality of runoff delivered to the structural
BMP. Maintenance must be performed whenever needed, based on maintenance indicators
presented in Table B-2.
Routine maintenance activities for the biofiltration BMPs specified for this project will typically be
performed by landscape maintenance contractors or other specialty contractors. These activities
generally involve good housekeeping procedures to limit trash and debris accumulation in the
planters, maintain healthy vegetation, minimize erosion and maintain biofiltration planter
components in good working condition.
The maintenance indicators and actions listed in Table B-2 below apply to routine maintenance.
Table B-2. Routine Maintenance Indicators and Actions
Maintenance Indicator Maintenance Actions
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.
Overgrown vegetation Mow or trim as appropriate, but not less than the design
height of the vegetation per original plans when applicable
(e.g. a vegetated swale may require a minimum vegetation
height).
Erosion due to concentrated
irrigation flow
Repair/re-plant eroded areas and adjust the irrigation
system.
Erosion due to concentrated
storm water runoff flow
Repair/re-plant eroded areas, and make appropriate
corrective measures such as adding erosion control
blankets, adding stone at flow entry points, or minor re-
grading to restore proper drainage according to the original
plan. If the issue is not corrected by restoring the BMP to
the original plan and grade, the City Engineer shall be
contacted prior to any additional repairs or reconstruction
Standing water in biofiltration
planters for longer than 96
hours following a storm event
Make appropriate corrective measures such as
inspecting/unclogging orifice opening, adjusting irrigation
system, removing obstructions of debris or invasive
vegetation, clearing underdrains (where applicable), or
repairing/replacing clogged or compacted soils.
Obstructed inlet or outlet
structure
Clear obstructions.
Damage to structural
components such as weirs,
inlet or outlet structures
Repair or replace as applicable
B.5 Non-Routine Maintenance or BMP Failure
If any of the following scenarios are observed, the BMP is not performing as intended to protect
downstream waterways from pollution and/or erosion. Corrective maintenance, increased
inspection and maintenance, BMP replacement, or a different BMP type will be required.
• The BMP is not drained between storm events. Surface ponding longer than
approximately 24 hours following a storm event may be detrimental to vegetation health,
and surface ponding longer than approximately 96 hours following a storm event poses a
risk of vector (mosquito) breeding. Poor drainage can result from clogging of the media
layer, filter course, aggregate storage layer, underdrain, or outlet structure. The specific
cause of the drainage issue must be determined and corrected.
• Sediment, trash, or debris accumulation greater than 25% of the surface ponding volume
within one month. This means the load from the tributary drainage area is too high,
reducing BMP function or clogging the BMP. This would require pretreatment measures
within the tributary area draining to the BMP to intercept the materials. Pretreatment
components, especially for sediment, will extend the life of components that are more
expensive to replace such as media, filter course, and aggregate layers.
• Erosion due to concentrated storm water runoff flow that is not readily corrected by adding
erosion control blankets, adding stone at flow entry points, or minor re-grading to restore
proper drainage according to the original plan. If the issue is not corrected by restoring the
BMP to the original plan and grade, the City Engineer shall be contacted prior to any
additional repairs or reconstruction .
B.6 Special Considerations
Biofiltration is a vegetated structural BMP. Vegetated structural BMPs that are constructed in the
vicinity of, or connected to, an existing jurisdictional water or wetland could inadvertently result in
creation of expanded waters or wetlands. As such, vegetated structural BMPs have the potential
to come under the jurisdiction of the United States Army Corps of Engineers, SDRWQCB,
California Department of Fish and Wildlife, or the United States Fish and Wildlife Service. This
could result in the need for specific resource agency permits and costly mitigation to perform
maintenance of the structural BMPs. Along with proper placement of a structural BMP, routine
maintenance is key to preventing this scenario.
C. CURB INLET FILTER
The Bio Clean Curb Inlet Filter is proposed in the curb inlet located on the west (southbound) side
State Street approximately 200 feet northwest of the northerly site boundary. This is a stormwater
device designed to remove high levels of trash, debris, sediments and hydrocarbons. The filter is
to include a “Kraken” membrane filter.
As with all stormwater BMPs, inspection and maintenance on the Curb Inlet Filter is necessary.
It is recommended that inspections be performed multiple times during the first year to assess
site specific loading conditions. This is recommended because pollutant loading can vary greatly
from site to site. Variables such as nearby soil erosion or construction sites, amount of daily traffic
and land use can increase pollutant loading on the system. The first year of inspections can be
used to set inspection and maintenance intervals for subsequent years. Without appropriate
maintenance a BMP can exceed its storage capacity which can negatively affect its
continued performance in removing and retaining captured pollutants.
The attached manufacturer’s manuals address maintenance procedures: (a) for the basic
components if the inlet filter for trash capture and multi‐level screening, and; (b) for the “Kraken”
and media filter.
C.1 Access to Curb Inlet Filter
The curb inlet filter can be accessed for inspection and routine maintenance via a manhole in the
public sidewalk. Access to for corrective maintenance can be via the sidewalk and public street,
with appropriate traffic control.
C.2 Features to Facilitate Inspection
The filter basket is positioned directly under the manhole access opening of the curb inlet. This
design allows the filter to be cleaned from finish surface without access into the catch basin,
therefore reducing maintenance time and eliminating confined space entry. The filter has a lifting
handle allowing for the filter to be removed through the manhole. The weir folds up to allow for
unimpeded access into the basin for routine maintenance or pipe jetting
C.3 Normal Expected Maintenance
See attached manufacturer’s information for maintenance indicators and procedures.
C.4 Non-Standard Maintenance or BMP Failure
See attached manufacturer’s information for maintenance indicators and procedures.
OPERATION & MAINTENANCE
Bio Clean Environmental Services, Inc.
398 Via El Centro
Oceanside, CA 92058
www.BioCleanEnvironmental.com
p: 760.433.7640
f: 760.433.3176
Curb Inlet Filter
1 | Page
OPERATION & MAINTENANCE
The Bio Clean Curb Inlet Filter is a stormwater device designed to remove high levels of trash,
debris, sediments and hydrocarbons. The filter is available in several configurations including trash
full capture, multi‐level screening, Kraken membrane filter and media filter variations. This manual
covers maintenance procedures of the trash full capture and multi‐level screening configurations. A
supplemental manual is available for the Kraken and media filter variations. The innovative trough &
weir system is mounted along the curb face and directs incoming stormwater toward the filter
basket which is positioned “directly” under the manhole access opening regardless of its location in
the catch basin. This innovative design allows the filter to be cleaned from finish surface without
access into the catch basin, therefore drastically reducing maintenance time and eliminating
confined space entry. The filter has a lifting handle allowing for the filter to be removed easily
through the manhole. The weir also folds up to allow for unimpeded access into the basin for
routine maintenance or pipe jetting.
As with all stormwater BMPs, inspection and maintenance on the Curb Inlet Filter is necessary.
Stormwater regulations require BMPs be inspected and maintained to ensure they are operating as
designed to allow for effective pollutant removal and provide protection to receiving water bodies.
It is recommended that inspections be performed multiple times during the first year to assess site‐
specific loading conditions. This is recommended because pollutant loading can vary greatly from
site to site. Variables such as nearby soil erosion or construction sites, winter sanding of roads,
amount of daily traffic and land use can increase pollutant loading on the system. The first year of
inspections can be used to set inspection and maintenance intervals for subsequent years. Without
appropriate maintenance a BMP can exceed its storage capacity which can negatively affect its
continued performance in removing and retaining captured pollutants.
System Diagram:
2 | Page
Inspection Equipment
Following is a list of equipment to allow for simple and effective inspection of the Curb Inlet Filter:
Bio Clean Environmental Inspection Form (contained within this manual).
Manhole hook or appropriate tools to remove access hatches and covers.
Appropriate traffic control signage and procedures.
Protective clothing and eye protection.
Note: entering a confined space requires appropriate safety and certification. It is generally
not required for routine inspections or maintenance of the system.
Inspection Steps
The core to any successful stormwater BMP maintenance program is routine inspections. The
inspection steps required on the Curb Inlet Fitler are quick and easy. As mentioned above the first
year should be seen as the maintenance interval establishment phase. During the first year more
frequent inspections should occur in order to gather loading data and maintenance requirements
for that specific site. This information can be used to establish a base for long‐term inspection and
maintenance interval requirements.
The Curb Inlet Filter can be inspected though visual observation without entry into the catch basin.
All necessary pre‐inspection steps must be carried out before inspection occurs, such as safety
measures to protect the inspector and nearby pedestrians from any dangers associated with an
open access hatch or manhole. Once the manhole has been safely opened the inspection process
can proceed:
Prepare the inspection form by writing in the necessary information including project name,
location, date & time, unit number and other info (see inspection form).
Observe the inside of the catch basin through the manhole. If minimal light is available and
vision into the unit is impaired utilize a flashlight to see inside the catch basin.
Look for any out of the ordinary obstructions in the catch basin, trough, weir, filter basket,
basin floor our outlet pipe. Write down any observations on the inspection form.
Through observation and/or digital photographs estimate the amount of trash, foliage and
sediment accumulated inside the filter basket. Record this information on the inspection
form.
Observe the condition and color of the hydrocarbon boom. Record this information on the
inspection form.
3 | Page
Finalize inspection report for analysis by the maintenance manager to determine if
maintenance is required.
Maintenance Indicators
Based upon observations made during inspection, maintenance of the system may be required
based on the following indicators:
Missing or damaged internal components.
Obstructions in the trough, weir, filter basket or catch basin.
Excessive accumulation of trash, foliage and sediment in the filter basket and/or trough and
weir sections. Maintenance is required when the basket is greater than half‐full.
The following chart shows the 50% and 100% storage capacity of each filter height:
Model Filter Basket
Diameter (in)
Filter Basket
Height (in)
50% Storage
Capacity (cu ft)
100% Storage
Capacity (cu ft)
BC‐CURB‐30 18 30 2.21 4.42
BC‐CURB‐24 18 24 1.77 3.53
BC‐CURB‐18 18 18 1.33 2.65
BC‐CURB‐12 18 12 0.88 1.77
Maintenance Equipment
It is recommended that a vacuum truck be utilized to minimize the time required to maintain the
Curb Inlet Filter though it can easily cleaned by hand:
Bio Clean Environmental Maintenance Form (contained in O&M Manual).
Manhole hook or appropriate tools to access hatches and covers.
Appropriate safety signage and procedures.
Protective clothing and eye protection.
Note: entering a confined space requires appropriate safety and certification. It is generally
not required for routine maintenance of the system. Small or large vacuum truck (with
pressure washer attachment preferred).
Maintenance Procedures
It is recommended that maintenance occurs at least two days after the most recent rain event to
allow debris and sediments to dry out. Maintaining the system while flows are still entering it will
increase the time and complexity required for maintenance. Cleaning of the Curb Inlet Filter can be
performed from finish surface without entry into catch basin utilizing a vacuum truck. Some unique
4 | Page
and custom configurations may create conditions which would require entry for some or all of the
maintenance procedures. Once all safety measures have been set up cleaning of the Curb Inlet
Filter can proceed as followed:
Remove all manhole cover or access hatches (traffic control and safety measures to be
completed prior).
Using an extension on a vacuum truck position the hose over the opened manhole or hatch
opening. Insert the vacuum hose down into the filter basket and suck out trash, foliage and
sediment. A pressure wash is recommended and will assist in spraying of any debris stuck on
the side or bottom of the filter basket. If the filter basket is full, trash, sediment, and debris
will accumulate inside the trough and weir sections of the system. Once the filter basket is
clean power wash the weir and trough pushing these debris into the filter basket (leave the
hose in the filter basket during this process so entering debris will be sucked out). Power
wash off the trough, weir, debris screen, and filter basket sides and bottom.
Next remove the hydrocarbon boom that is attached to the inside of the filter basket. The
hydrocarbon boom is fastened to rails on two opposite sides of the basket (vertical rails).
Assess the color and condition of the boom using the following information in the next
bullet point. If replacement is required install and fasten on a new hydrocarbon boom.
Booms can be ordered directly from the manufacturer.
Follow is a replacement indication color chart for the hydrocarbon booms:
The last step is to close up and replace the manhole or hatch and remove all traffic control.
All removed debris and pollutants shall be disposed of following local and state
requirements.
Disposal requirements for recovered pollutants may vary depending on local guidelines. In
most areas the sediment, once dewatered, can be disposed of in a sanitary landfill. It is not
anticipated that the sediment would be classified as hazardous waste.
In the case of damaged components, replacement parts can be ordered from the
manufacturer. Hydrocarbon booms can also be ordered directly from the manufacturer as
previously noted.
Excellent
Condition
Good
Condition
Minimal Capacity
Replacement Required
5 | Page
Maintenance Sequence
Insert the vacuum hose down into the filter basket and suck out
debris. Use a pressure washer to assist in vacuum removal. Pressure wash off the weir and trough and vacuum out any
remaining debris.
Remove manhole cover and set up vacuum truck to clean the filter basket. Ensure all
traffic control and safety measures are in place.
6 | Page
For Maintenance Services or Information Please Contact Us At:
760‐433‐7640
Or Email: info@biocleanenvironmental.com
Remove the hydrocarbon boom
that is attached to the inside of the
filter basket. The hydrocarbon
boom is fastened to rails on two
opposite sides of the basket
(vertical rails). Assess the color and
condition of the boom using the
following information in the next
bullet point. If replacement is
required install and fasten on a
new hydrocarbon boom.
Close up and replace the
manhole or hatch and
remove all traffic control.
All removed debris and
pollutants shall be
disposed of following local
and state requirements.
For Office Use Only
(city) (Zip Code)(Reviewed By)
Owner / Management Company
(Date)
Contact Phone ( )_
Inspector Name Date / / Time AM / PM
Weather Condition Additional Notes
Site
Map #
Long:
Storm Event in Last 72-hours? No Yes
GPS Coordinates of
Insert Catch Basin Size
Evidence of
Illicit
Discharge?
Trash
Accumulation
Type of Inspection Routine Follow Up Complaint Storm
Lat:
Long:
Lat:
Long:
Sediment
Accumulation
Office personnel to complete section to the
left.
Functioning Properly or
Maintenance Needed?
398 Via El Centro, Oceanside, CA 92058 P. 760.433.7640 F. 760.433.3176
Comments:
Foliage
Accumulation
Long:
Lat:
Long:
Lat:
3 Lat:
2
1
Long:
Inspection and Maintenance Report
Catch Basin Only
Signs of Structural
Damage?
5
4
6 Lat:
Lat:
Lat:
Long:
7
Lat:
Long:
10
8
Long:
Project Name
Project Address
12 Lat:
11 Lat:
Long:
Long:
ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit [Use the City’s standard Single Sheet BMP Plan.]
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PROFESSIONAL ENGINEERCIVILLARR
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RUSSEL TAYLORSTATE OF CALIFORN
IA No. 58274Exp. 06.30.2022BMP TYPEBMP ID #SYMBOLCASQA NO.DRAWING NO.SHEET NO.(S)MAINTENANCEFREQUENCYBMP TABLEINSPECTION FREQUENCYQUANTITYTREATMENT CONTROLLOW IMPACT DESIGN (L.I.D.)SOURCE CONTROLBELOWSEE DETAIL123456789REV. 1/20201. THESE BMPS ARE MANDATORY TO BE INSTALLED PER MANUFACTURER'SRECOMMENDATIONS OR THESE PLANS.2. NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIORAPPROVAL FROM THE CITY ENGINEER.3. NO SUBSTITUTIONS TO THE MATERIAL OR TYPES OR PLANTING TYPESWITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER.4. NO OCCUPANCY WILL BE GRANTED UNTIL THE CITY INSPECTION STAFFHAS INSPECTED THIS PROJECT FOR APPROPRIATE BMP CONSTRUCTIONAND INSTALLATION.BMP NOTES:PARTY RESPONSIBLE FOR MAINTENANCE:NAMEADDRESSPHONE NO.CONTACTPLAN PREPARED BY:NAMEADDRESSPHONE NO.CERTIFICATIONCOMPANY5. REFER TO MAINTENANCE AGREEMENT DOCUMENT.6. SEE PROJECT SWMP FOR ADDITIONAL INFORMATION.SIGNATUREBMP CONSTRUCTION AND INSPECTION NOTES:THE EOW WILL VERIFY THAT PERMANENT BMPS ARECONSTRUCTED AND OPERATING IN COMPLIANCE WITH THEAPPLICABLE REQUIREMENTS. PRIOR TO OCCUPANCY THEEOW MUST PROVIDE:1.PHOTOGRAPHS OF THE INSTALLATION OF PERMANENTBMPS PRIOR TO CONSTRUCTION, DURINGCONSTRUCTION, AND AT FINAL INSTALLATION.2.A WET STAMPED LETTER VERIFYING THAT PERMANENTBMPS ARE CONSTRUCTED AND OPERATING PER THEREQUIREMENTS OF THE APPROVED PLANS.3.PHOTOGRAPHS TO VERIFY THAT PERMANENT WATERQUALITY TREATMENT SIGNAGE HAS BEEN INSTALLED.PRIOR TO RELEASE OF SECURITIES, THE DEVELOPER ISRESPONSIBLE FOR ENSURING THE PERMANENT BMPS HAVENOT BEEN REMOVED OR MODIFIED BY THE NEW HOMEOWNEROR HOA WITHOUT THE APPROVAL OF THE CITY ENGINEER.OCEAN CONDOMINIUMS1212PERMANENT WATER QUALITYTREATMENT FACILITYKEEPING OUR WATERWAYS CLEANMAINTAIN WITH CARE- NO MODIFICATIONS WITHOUT AGENCY APPROVALSIGNAGE NOTES:12/14/2021