HomeMy WebLinkAboutPD 2023-0003; ROCKSTAR TRASH CAPTURE; TRASH CAPTURE STORMWATER QUALITY MANAGEMENT PLAN; 2023-04-07TABLE 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 Trash Capture Structural BMPs
Attachment 1: Backup for Trash Capture BMPs
Attachment 1a: DMA Exhibit
Attachment 1b: Tabular Summary of DMAs
Attachment 1c: Trash Capture BMP Design Calculations
Attachment 2: Trash Capture BMP Maintenance Thresholds and Actions
Attachment 3: Single Sheet BMP (SSBMP) Exhibit
STORM WATER STANDARDS QUESTIONNAIRE
E-34
Development Services
Land Development Engineering
1635 Faraday Avenue
442-339-2750
www.carlsbadca.gov
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, “PRIORITY DEVELOPMENT PROJECT (PDP) requirements or not considered a development project. This questionnaire will also determine if the project is subject to TRASH CAPTURE 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: APN:
ADDRESS:
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.
This Box for City Use Only
City Concurrence:
YES NO Date: Project ID:
By:
E-34 Page 1 of 4 REV 08/22
INSTRUCTIONS:
Tenant Improvement 5759 Fleet Street 211-022-25-00
5759 FLEET STREET, CARLSBAD, CA 92008
23,232 0.53
4,960 0.11
E-34 Page 2 of 4 REV 08/22
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 6, mark the 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; OR b) Designed and constructed to be hydraulically disconnected from paved streets or roads; OR 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 6, 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 08/22
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, complete the trash capture question.
If you answered “no” to all of the above questions, your project is a ‘STANDARD PROJECT’. Go to step 5, complete the trash capture question.
* Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and County of San Diego; Habitat Management Plan; and any other equivalent environmentally sensitive areas which have been identified by the City.
SITE INFORMATION CHECKLIST
Project Summary Information
Project Name Tenant Improvement 5759 Fleet Street
Project ID CBC2022-0224, PD2023-003
Project Address 5759 Fleet Street
Carlsbad, CA 92008
Assessor's Parcel Number(s) (APN(s)) 211-022-25-00
Project Watershed (Hydrologic Unit) Carlsbad 904 Encinas
Parcel Area 5.09 Acres (221,720 Square Feet)
, GR2023-0004
Description of Existing Site Condition and Drainage Patterns
Select applicable Land Use Category:
High Density Residential
R-23 (15-23 du/ac)
R-30 (23-30 du/ac)
Industrial
X PI (Planned Industrial)
Commercial
CF (Community Facilities)
GC (General Commercial)
L (Local Shopping Center)
R (Regional Commercial)
V-B (Village-Barrio)
VC (Visitor Commercial)
O (Office)
VC/OS (Visitor Commercial/Open Space)
Mixed Urban
PI/O (Planned Industrial/Office)
Public Transportation Stations
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 existing site generally drains from southeast to northwest. The existing conveyance is
urban and includes concrete ribbon gutters that direct flow to two catch basins and existing
private storm drain on-site. The southern catch basin is connected to an existing private storm
drain that collects runoff from the southern portion of the site and ties into the City’s storm drain
system that flows south on Armada Drive and is discharged to Encinas Creek and the Pacific
Ocean. The northern catch basin is connected to an existing private storm drain that ties into the
City’s storm drain system that flows north on Armada Drive and then eventually south on Fleet
Street and is discharged to Encinas Creek and the Pacific Ocean. No off-site flow is conveyed
through the site.
Description of Proposed Site Development and Drainage Patterns
Project Description / Proposed Land Use and/or Activities:
The proposed land use will remain. The site will be utilized for commercial purposes. The
project is proposing new outdoor employee amenity space, expanded trash enclosure, EV
parking and charging area, ADA compliance upgrades, and replaced landscaping.
Does the project include grading and changes to site topography?
Yes
X No
Description / Additional Information:
No changes to site topography are proposed.
Does the project include changes to site drainage (e.g., installation of new storm water
conveyance systems)?
Yes
X No
Description / Additional Information:
No changes to site drainage are proposed.
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 02/22
Development Services
Land Development Engineering
1635 Faraday Avenue
442-339-2750
www.carlsbadca.gov
STANDARD PROJECT
REQUIREMENT
CHECKLIST
E-36
Project Information
Project Name:
Project ID:
DWG No. or Building Permit No.:
Baseline BMPs for Existing and Proposed Site Features
Complete the Table 1 - Site Design Requirement to document existing and proposed site features and the BMPs to be
implemented for them. All BMPs must be implemented where applicable and feasible. Applicability is generally
assumed if a feature exists or is proposed.
BMPs must be implemented for site design features where feasible. Leaving the box for a BMP unchecked means it
will not be implemented (either partially or fully) either because it is inapplicable or infeasible. Explanations must be
provided in the area below. The table provides specific instructions on when explanations are required.
Table 1 - Site Design Requirement
A. Existing Natural Site Features (see Fact Sheet BL-1)
1. Check the boxes below for each existing feature on
the site.
1. Select the BMPs to be implemented for each identified feature. Explain
why any BMP not selected is infeasible in the area below.
SD-G
Conserve natural
features
SD-H
Provide buffers around waterbodies
Natural waterbodies
Natural storage reservoirs & drainage corridors --
Natural areas, soils, & vegetation (incl. trees) --
B. BMPs for Common Impervious Outdoor Site Features (see Fact Sheet BL-2)
1. Check the boxes below for each
proposed feature.
2. Select the BMPs to be implemented for each proposed feature. If neither BMP SD-B nor
SD-I is selected for a feature, explain why both BMPs are infeasible in the area below.
SD-B
Direct runoff to pervious
areas
SD-I
Construct surfaces from
permeable materials
Minimize size of
impervious areas
Streets and roads Check this box to confirm
that all impervious areas on
the site will be minimized
where feasible.
If this box is not checked,
identify the surfaces that
cannot be minimized in area
below, and explain why it is
Sidewalks & walkways
Parking areas & lots
Driveways
Patios, decks, & courtyards
Hardcourt recreation areas
Tenant Improvement 5759 Fleet Street
CBC2022-0224 , PD2023-003PD2023-0003, GR2023-0004
E-36 Page 2 of 4 Revised 02/22
Other: _______________ infeasible to do so.
C. BMPs for Rooftop Areas: Check this box if rooftop areas are proposed and select at least one BMP
below.
If no BMPs are selected, explain why they are infeasible in the area below.
(see Fact
Sheet BL-3)
SD-B
Direct runoff to pervious areas
SD-C
Install green roofs
SD-E
Install rain barrels
D. BMPs for Landscaped Areas: Check this box if landscaping is proposed and select the BMP below
SD-K Sustainable Landscaping
If SD-K is not selected, explain why it is infeasible in the area below.
(see Fact
Sheet BL-4)
Provide discussion/justification for site design BMPs that will not be implemented (either partially or fully):
Baseline BMPs for Pollutant-generating Sources
All development projects must complete Table 2 - Source Control Requirement to identify applicable requirements for
documenting pollutant-generating sources/ features and source control BMPs.
BMPs must be implemented for source control features where feasible. Leaving the box for a BMP unchecked means it
will not be implemented (either partially or fully) either because it is inapplicable or infeasible. Explanations must be
provided in the area below. The table provides specific instructions on when explanations are required.
Table 2 - Source Control Requirement
A. Management of Storm Water Discharges
1. Identify all proposed outdoor
work areas below
Check here if none are proposed
2. Which BMPs will be used to prevent
materials from contacting rainfall or
runoff?
(See Fact Sheet BL-5)
Select all feasible BMPs for each work area
3. Where will runoff from the
work area be routed?
(See Fact Sheet BL-6)
Select one or more option for each
work area
SC-A
Overhead
covering
SC-B
Separation
flows from
adjacent
areas
SC-C
Wind
protection
SC-D
Sanitary
sewer
SC-E
Containment
system
Other
Trash & Refuse Storage
Materials & Equipment Storage
No rooftop areas of redevelopment are proposed
E-36 Page 3 of 4 Revised 02/22
Loading & Unloading
Fueling
Maintenance & Repair
Vehicle & Equipment Cleaning
Other: _________________
B. Management of Storm Water Discharges (see Fact Sheet BL-7)
Select one option for each feature below:
• Storm drain inlets and catch basins … are not proposed
will be labeled with stenciling or signage to
discourage dumping (SC-F)
• Interior work surfaces, floor drains &
sumps …
are not proposed
will not discharge directly or indirectly to the MS4
or receiving waters
• Drain lines (e.g. air conditioning, boiler,
etc.) …
are not proposed
will not discharge directly or indirectly to the MS4
or receiving waters
• Fire sprinkler test water … are not proposed will not discharge directly or indirectly to the MS4
or receiving waters
Provide discussion/justification for source control BMPs that will not be implemented (either partially or fully):
[Continued from previous page – This page is reserved for continuation of description of general
strategy for trash capture BMP implementation at the site.]
ATTACHMENT 1
BACKUP FOR TRASH CAPTURE 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 Trash Capture BMP Design
Worksheets / Calculations (Required)
Refer to Appendices J of the BMP
Design Manual for trash capture BMP
design guidelines
Included
Use this checklist to ensure the required information has been included on the DMA
Exhibit:
The DMA Exhibit must identify:
Site topography and impervious areas
Site drainage network and connections to drainage offsite
Proposed grading (if applicable)
Drainage management area (DMA) boundaries, DMA ID numbers, and DMA areas (square
footage or acreage)
Trash Capture BMPs (identify location and type of BMP)
UP
EXISTING
DRAINAGE
SLOPE TO
REMAIN
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DMA AREA DETAILS
BMP 1: FABCO CONNECTOR PIPE SCREEN
DEVICE ASSEMBLY, 24"
BMP 1: FABCO CONNECTOR PIPE SCREEN
DEVICE ASSEMBLY, 24"
BMP 1: FABCO CONNECTOR PIPE SCREEN
DEVICE ASSEMBLY, 24"
BMP 1: FABCO CONNECTOR PIPE SCREEN
DEVICE ASSEMBLY, 24"
BMP 1: FABCO CONNECTOR PIPE SCREEN
DEVICE ASSEMBLY, 24"
BMP 2: FABCO CONNECTOR PIPE SCREEN
DEVICE ASSEMBLY,18"
BMP 2: FABCO CONNECTOR PIPE SCREEN
DEVICE ASSEMBLY,18"
BMP 2: FABCO CONNECTOR PIPE SCREEN
DEVICE ASSEMBLY,18"
BMP 2: FABCO CONNECTOR PIPE SCREEN
DEVICE ASSEMBLY,18"
N/A
N/A
N/A
--
NOAA Atlas 14, Volume 6, Version 2
Location name: Carlsbad, California, USA*
Latitude: 33.1298°, Longitude: -117.3181°
Elevation: 169.9 ft**
* source: ESRI Maps ** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, SandraPavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey
Bonnin, Daniel Brewer, Li-Chuan Chen, Tye Parzybok, John Yarchoan
NOAA, National Weather Service, Silver Spring, Maryland
PF_tabular | PF_graphical | Maps_&_aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
Duration Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
5-min 0.124
(0.105‑0.149)
0.157
(0.132‑0.189)
0.202
(0.170‑0.244)
0.241
(0.200‑0.293)
0.297
(0.238‑0.374)
0.342
(0.268‑0.441)
0.390
(0.298‑0.516)
0.443
(0.328‑0.604)
0.518
(0.367‑0.738)
0.581
(0.397‑0.858)
10-min 0.178
(0.150‑0.214)
0.225
(0.189‑0.271)
0.290
(0.243‑0.350)
0.346
(0.287‑0.420)
0.425
(0.341‑0.536)
0.490
(0.384‑0.632)
0.559
(0.427‑0.740)
0.634
(0.470‑0.865)
0.743
(0.526‑1.06)
0.832
(0.568‑1.23)
15-min 0.216
(0.181‑0.259)
0.273
(0.229‑0.328)
0.351
(0.294‑0.423)
0.418
(0.347‑0.508)
0.514
(0.412‑0.648)
0.593
(0.464‑0.764)
0.676
(0.516‑0.895)
0.767
(0.568‑1.05)
0.898
(0.636‑1.28)
1.01
(0.687‑1.49)
30-min 0.304
(0.256‑0.365)
0.385
(0.323‑0.462)
0.495
(0.415‑0.597)
0.590
(0.490‑0.718)
0.726
(0.582‑0.915)
0.837
(0.656‑1.08)
0.955
(0.729‑1.26)
1.08
(0.802‑1.48)
1.27
(0.898‑1.81)
1.42
(0.970‑2.10)
60-min 0.419
(0.353‑0.503)
0.530
(0.445‑0.636)
0.682
(0.571‑0.822)
0.812
(0.675‑0.988)
1.00
(0.801‑1.26)
1.15
(0.903‑1.49)
1.31
(1.00‑1.74)
1.49
(1.10‑2.03)
1.75
(1.24‑2.49)
1.96
(1.34‑2.89)
2-hr 0.573
(0.482‑0.688)
0.717
(0.602‑0.862)
0.913
(0.766‑1.10)
1.08
(0.898‑1.31)
1.32
(1.06‑1.66)
1.51
(1.19‑1.95)
1.72
(1.31‑2.27)
1.94
(1.44‑2.65)
2.26
(1.60‑3.22)
2.52
(1.72‑3.73)
3-hr 0.681
(0.573‑0.817)
0.850
(0.714‑1.02)
1.08
(0.905‑1.30)
1.28
(1.06‑1.55)
1.55
(1.24‑1.96)
1.78
(1.39‑2.29)
2.01
(1.54‑2.66)
2.27
(1.68‑3.09)
2.63
(1.86‑3.75)
2.92
(2.00‑4.33)
6-hr 0.896
(0.754‑1.08)
1.12
(0.943‑1.35)
1.43
(1.20‑1.72)
1.68
(1.40‑2.05)
2.04
(1.63‑2.57)
2.32
(1.82‑3.00)
2.62
(2.00‑3.47)
2.94
(2.17‑4.01)
3.38
(2.40‑4.82)
3.74
(2.55‑5.53)
12-hr 1.16
(0.973‑1.39)
1.47
(1.23‑1.76)
1.88
(1.57‑2.26)
2.21
(1.84‑2.69)
2.68
(2.15‑3.37)
3.04
(2.38‑3.92)
3.41
(2.61‑4.52)
3.80
(2.82‑5.19)
4.34
(3.08‑6.19)
4.76
(3.25‑7.05)
24-hr 1.43
(1.26‑1.65)
1.84
(1.62‑2.13)
2.37
(2.08‑2.75)
2.80
(2.44‑3.28)
3.40
(2.87‑4.10)
3.85
(3.19‑4.74)
4.31
(3.49‑5.44)
4.79
(3.78‑6.20)
5.45
(4.13‑7.33)
5.96
(4.37‑8.28)
2-day 1.75
(1.54‑2.03)
2.27
(2.00‑2.63)
2.94
(2.59‑3.42)
3.49
(3.05‑4.09)
4.25
(3.59‑5.13)
4.82
(4.00‑5.94)
5.41
(4.38‑6.82)
6.02
(4.75‑7.79)
6.85
(5.20‑9.22)
7.50
(5.50‑10.4)
3-day 1.96
(1.73‑2.27)
2.55
(2.25‑2.95)
3.32
(2.92‑3.86)
3.96
(3.45‑4.63)
4.82
(4.08‑5.82)
5.49
(4.55‑6.76)
6.18
(5.00‑7.78)
6.88
(5.43‑8.91)
7.85
(5.95‑10.6)
8.61
(6.32‑12.0)
4-day 2.13
(1.88‑2.47)
2.79
(2.45‑3.23)
3.64
(3.20‑4.23)
4.35
(3.79‑5.09)
5.31
(4.49‑6.42)
6.06
(5.02‑7.47)
6.83
(5.53‑8.61)
7.62
(6.01‑9.86)
8.71
(6.61‑11.7)
9.57
(7.02‑13.3)
7-day 2.49
(2.19‑2.88)
3.27
(2.88‑3.79)
4.31
(3.79‑5.01)
5.17
(4.51‑6.05)
6.35
(5.37‑7.67)
7.27
(6.03‑8.95)
8.22
(6.66‑10.4)
9.21
(7.26‑11.9)
10.6
(8.02‑14.2)
11.6
(8.55‑16.2)
10-day 2.76
(2.43‑3.19)
3.65
(3.21‑4.22)
4.83
(4.25‑5.61)
5.82
(5.07‑6.81)
7.18
(6.07‑8.66)
8.24
(6.83‑10.1)
9.34
(7.57‑11.8)
10.5
(8.28‑13.6)
12.1
(9.17‑16.3)
13.4
(9.80‑18.6)
20-day 3.34
(2.95‑3.87)
4.47
(3.94‑5.18)
5.99
(5.27‑6.96)
7.26
(6.34‑8.50)
9.04
(7.64‑10.9)
10.5
(8.66‑12.9)
11.9
(9.65‑15.0)
13.5
(10.6‑17.4)
15.7
(11.9‑21.1)
17.4
(12.8‑24.2)
30-day 3.98
(3.51‑4.60)
5.34
(4.71‑6.19)
7.20
(6.33‑8.36)
8.76
(7.64‑10.3)
11.0
(9.27‑13.2)
12.7
(10.5‑15.7)
14.6
(11.8‑18.4)
16.5
(13.0‑21.4)
19.3
(14.6‑26.0)
21.6
(15.8‑30.0)
45-day 4.70
(4.14‑5.43)
6.31
(5.56‑7.31)
8.52
(7.49‑9.90)
10.4
(9.07‑12.2)
13.1
(11.1‑15.8)
15.2
(12.6‑18.8)
17.5
(14.2‑22.1)
20.0
(15.8‑25.8)
23.5
(17.8‑31.6)
26.3
(19.3‑36.6)
60-day 5.44
(4.80‑6.29)
7.28
(6.42‑8.44)
9.83
(8.64‑11.4)
12.0
(10.5‑14.1)
15.1
(12.8‑18.3)
17.7
(14.7‑21.8)
20.4
(16.5‑25.7)
23.3
(18.4‑30.2)
27.6
(20.9‑37.1)
31.0
(22.8‑43.1)
1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for agiven duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not
checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
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PF graphical
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Maps & aerials
Small scale terrain
Large scale terrain
Large scale map
Large scale aerial
+
–
3km
2mi
+
–
100km
60mi
+
–
100km
60mi
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US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: HDSC.Questions@noaa.gov
Disclaimer
+
–
100km
60mi
SITE LOCATION
SITE = 2.5 INCHES
Chapter 7: Long Term Operation and Maintenance
7-13 Sept. 2021
TABLE 7-5. Maintenance Indicators and Actions for Detention BMPs
Typical Maintenance Indicator(s)
for Detention Basins Maintenance Actions
Poor vegetation establishment Re-seed, re-establish vegetation.
Overgrown vegetation Mow or trim as appropriate.
Erosion due to concentrated irrigation
flow
Repair/re-seed/re-plant eroded areas and adjust the irrigation
system.
Erosion due to concentrated storm
water runoff flow
Repair/re-seed/re-plant eroded areas and make appropriate
corrective measures such as adding erosion control blankets, adding
stone at flow entry points, or re-grading where necessary.
Accumulation of sediment, litter, or
debris Remove and properly dispose of accumulated materials.
Standing water
Make appropriate corrective measures such as adjusting irrigation
system, removing obstructions of debris or invasive vegetation, or
minor re-grading for proper drainage.
Obstructed inlet or outlet structure Clear obstructions.
Damage to structural components such
as weirs, inlet or outlet structures Repair or replace as applicable.
7.7.5 Maintenance of Trash Capture Devices
Trash capture devices include any device listed in the California Water Board’s certified list of Trash
Capture Devices and BMPs. The project civil engineer should refer to the manufacturer’s guide for
maintenance indicators and actions.
TABLE 7-6. Maintenance Indicators and Actions for Trash Captures BMPs
Typical Maintenance Indicator(s) for
Trash Captures BMPs Maintenance Actions
Accumulation of sediment, litter, or
debris Remove and properly dispose accumulated materials.
Obstructed inlet or outlet structure Clear obstructions.
Clogged filter media Remove and properly dispose filter media, and replace with fresh
media.
Damage to components of the filtration
system Repair or replace as applicable.
Note: For trash capture BMPs, refer to the manufacturer's maintenance guide.
ATTACHMENT 3
City standard Trash Capture BMP Exhibit
[Use the City’s standard Trash Capture BMP Plan.]
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PLAN PREPARED BY:
BMP NOTES:
PARTY RESPONSIBLE FOR MAINTENANCE:BMP CONSTRUCTION AND INSPECTION NOTES:
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REVIEWED BY:
DATEINSPECTOR
DATE
"AS BUILT"
ENGINEERING DEPARTMENT
RCE EXP.
REV. 1/2020
SITE DESIGN BMPS:
SOURCE CONTROL BMPS:
BMP TYPEBMP ID #SYMBOL CASQA NO.DRAWING NO.SHEET NO.(S)MAINTENANCE
FREQUENCY
TRASH CAPTURE BMP TABLE
INSPECTION
FREQUENCYQUANTITY
TRASH CAPTURE BMPs
**
QUARTERLY QUARTERLYDEVICE ASSEMBLYFABCO CONNECTOR
BMP TYPEBMP ID #SYMBOL CASQA NO.DRAWING NO.SHEET NO.(S)MAINTENANCE
FREQUENCY
TRASH CAPTURE BMP TABLE
INSPECTION
FREQUENCYQUANTITY
TRASH CAPTURE BMPs
1 EA.2
**
QUARTERLY QUARTERLY
QUARTERLY QUARTERLYQUARTERLYQUARTERLY1 EA.
24"
2
10020-4-000
10020-3-000DEVICE ASSEMBLY
FABCO CONNECTOR
18"