prepared for: prepared by: bha inc

CT 15-11

PREPARED FOR:

Jim Yada

c/o Yada Family Trust

31 Rolling Green

Irvine, CA 92620

PREPARED BY:

bha, Inc land planning, civil engineering, surveying

5115 Avenida Encinas, Suite L

Carlsbad, CA 92008

760-931-8700

April 5, 2016

W.O. 993-1289-401

CITY OF CARLSBAD

ENGINEERING DIVISION

PRIORITY DEVELOPMENT PROJECT

STORM WATER MITIGATION PLAN FOR

YADA FAMILY FARM SUBDIVISION 1835 BUENA VISTA WAY

ENGINEER OF WORK

_________________________________________________________________________ BRUCE RICE RCE 60676- EXP 12-31-2016 DATE

TABLE OF CONTENTS

Certification Page

Project Vicinity Map

FORM I-1 Storm Water Standards Questionnaire (E-34) (Standard Project or PDP)

FORM I-2 Project Type Determination Checklist

FORM I-3B Site Information Checklist for PDPs

FORM I-4 Source Control BMP Checklist for All Development Projects

FORM I-5 Site Design BMP Checklist for All Development Projects FORM I-6 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: Structural BMP Maintenance Plan

Attachment 2a: Structural BMP Maintenance Thresholds and Actions

Attachment 3: Single-sheet BMP (SSBMP) Plan

Figure: Soil Type Exhibit

Figure: Geotechnical Reference

Storm Water Standards Questionnaire Part 1 (Storm Water Intake Form for all Development Permit Applications)

Form I-1

Project Identification

Project Name: Yada Family Farm Subdivision

Project ID: CT 15-11 Date: 04/04/16

Determination of Requirements

The purpose of this form is to identify permanent, post-construction requirements that apply to the project. This form serves as a short summary of applicable requirements, in some cases referencing separate forms that will serve as the backup for the determination of requirements. Answer each step below, starting with Step 1 and progressing through each step until reaching "Stop". Refer to BMP Design Manual sections and/or separate forms referenced in each step below.

Step Answer Progression

Step 1: Is the project a "development project"? See Section 1.3 of the BMP Design Manual for guidance.

Yes Go to Step 2.

No Stop. Permanent BMP requirements do not apply. No SWQMP will be required. Provide discussion below.

Discussion / justification if the project is not a "development project" (e.g., the project includes only interior remodels within an existing building):

Step 2: Is the project a Standard Project, Priority Development Project (PDP), or exception to PDP definitions? To answer this item, see Section 1.4 of the BMP Design Manual in its entirety for guidance, AND complete Form I-2, Project Type Determination.

Standard Project

Stop. Standard Project requirements apply, including Standard Project SWQMP.

PDP PDP requirements apply, including PDP SWQMP. Go to Step 3.

Exception to PDP definitions

Stop. Standard Project requirements apply. Provide discussion and list any additional requirements below. Prepare Standard Project SWQMP.

Discussion / justification, and additional requirements for exceptions to PDP definitions, if applicable:

Form I-1 Page 2

Step Answer Progression

Step 3. Is the project subject to earlier PDP requirements due to a prior lawful approval? See Section 1.10 of the BMP Design Manual for guidance.

Yes Consult the [City Engineer] to determine requirements. Provide discussion and identify requirements below. Go to Step 4.

No BMP Design Manual PDP requirements apply. Go to Step 4.

Discussion / justification of prior lawful approval, and identify requirements (not required if prior lawful approval does not apply):

Step 4. Do hydromodification control requirements apply? See Section 1.6 of the BMP Design Manual for guidance.

Yes PDP structural BMPs required for pollutant control (Chapter 5) and hydromodification control (Chapter 6). Go to Step 5.

No Stop. PDP structural BMPs required for pollutant control (Chapter 5) only. Provide brief discussion of exemption to hydromodification control below.

Discussion / justification if hydromodification control requirements do not apply:

Step 5. Does protection of critical coarse sediment yield areas apply? See Section 6.2 of the BMP Design Manual for guidance.

Yes Management measures required for protection of critical coarse sediment yield areas (Chapter 6.2). Stop.

No Management measures not required for protection of critical coarse sediment yield areas. Provide brief discussion below. Stop.

Discussion / justification if protection of critical coarse sediment yield areas does not apply: No critical course sediment yield areas apply.

Project Type Determination Checklist

Form I-2

Project Information


Project ID: CT 15-11 Project Type Determination: Standard Project or Priority Development Project (PDP)

The project is (select one): New Development Redevelopment

The total proposed newly created or replaced impervious area is: __67,851___ ft2 (___1.56___) acres

Is the project in any of the following categories, (a) through (f)?

Yes

No

(a) New development projects that create 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.

Yes

No

(b) Redevelopment projects that create and/or replace 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 surfaces). This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land.

Yes

No

(c) New and redevelopment projects that create 5,000 square feet or more of impervious surface (collectively over the entire project site), and support one or more of the following uses:

(v) Restaurants. This category is defined as 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).

(vi) Hillside development projects. This category includes development on any natural slope that is twenty-five percent or greater.

(vii) Parking lots. This category is defined as a land area or facility for the temporary parking or storage of motor vehicles used personally, for business, or for commerce.

(viii) Streets, roads, highways, freeways, and driveways. This category is defined as any paved impervious surface used for the transportation of automobiles, trucks, motorcycles, and other vehicles.

Form I-2 Page 2 of 2

Yes

No

(d) New or redevelopment projects that create or replace 2,500 square feet or more of impervious surface (collectively over the entire project site), and discharging 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). Note: ESAs are areas that 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 Board and San Diego Water Board; State Water Quality Protected Areas; water bodies designated with the RARE beneficial use by the State Water Board and San Diego Water Board; and any other equivalent environmentally sensitive areas which have been identified by the Copermittees. See BMP Design Manual Section 1.4.2 for additional guidance.

Yes

No

(e) New development projects that support one or more of the following uses:

(iii) Automotive repair shops. This category is defined as a facility that is categorized in any one of the following SIC codes: 5013, 5014, 5541, 7532-7534, or 75367539.

(iv) Retail gasoline outlets (RGOs). This category includes RGOs that meet the following criteria: (a) 5,000 square feet or more or (b) a projected Average Daily Traffic (ADT) of 100 or more vehicles per day.

Yes

No

(f) New or redevelopment projects that result in the disturbance of one or more acres of land and are expected to generate pollutants post construction. Note: See BMP Design Manual Section 1.4.2 for additional guidance.

Does the project meet the definition of one or more of the Priority Development Project categories (a) through (f) listed above?

No – the project is not a Priority Development Project (Standard Project). Yes – the project is a Priority Development Project (PDP).

The following is for redevelopment PDPs only: The area of existing (pre-project) impervious area at the project site is: _______ ft2 (A) The total proposed newly created or replaced impervious area is __ __ ft2 (B) Percent impervious surface created or replaced (A/B)*100: _______% The percent impervious surface created or replaced is (select one based on the above calculation):

less than or equal to fifty percent (50%) – only new impervious areas are considered PDP OR

greater than fifty percent (50%) – the entire project site is a PDP

Site Information Checklist For PDPs

Form I-3B (PDPs)

Project Summary Information

Project Name Yada Family Farm Subdivision

Project Address 1835 Buena Vista Way, Carlsbad, CA

Assessor's Parcel Number(s) (APN(s)) 156-220-01

Project ID PDS2015-LDGRMJ-30047; PDS2015-LDMJIP-50015

Project Watershed (Hydrologic Unit) Select One:

Santa Margarita 902

San Luis Rey 903

Carlsbad 904

San Dieguito 905

Penasquitos 906

San Diego 907

Pueblo San Diego 908

Sweetwater 909

Otay 910

Tijuana 911

Project Hydrologic Unit Hydrologic Area Select One:

Loma Alta 904.1

Buena Vista Creek 904.2

Agua Hedionda 904.3

Encinas 904.4

San Marcos 904.5

Escondido Creek 904.6

Parcel Area (total area of Assessor's Parcel(s) associated with the project)

__4.57__ Acres (___199,024__ Square Feet)

Area to be disturbed by the project (Project Area) __3.79__ Acres (__ 165,097__ Square Feet)

Project Proposed Impervious Area (subset of Project Area) __1.56 __ Acres (___67,851__ Square Feet)

Project Proposed Pervious Area (subset of Project Area) __2.23___ Acres (___97,246__ Square Feet)

Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the Project. This may be less than the Parcel Area.

Form I-3B Page 2 of 9

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: The 4.57 acre property in the past has been used for agricultural purposes, with an existing residential house in the northeast corner of the site. Fields and remnants of several shade canopy structures associated with nursery activities remain on portions of the property.

Existing Land Cover Includes (select all that apply):

Vegetative Cover

Non-Vegetated Pervious Areas

Impervious Areas Description / Additional Information: Property has an existing residential house in the northeast corner of the site, and fields and remnants of several shade canopy structures associated with nursery activities remain on portions of the property.

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: There are no existing natural hydrologic features.


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]: In the existing conditions, the site continues to support bare ground with few scatted trees. Topographically, the site is generally moderate sloping westerly towards Valley Street. The overall gradient of the site is on the order of 10 percent or flatter. The on-site soil classification is Type-B from ArcGIS Web BMP Sizing Calculator Website (see References). However, based on the preliminary Geotechnical Investigation prepared by Geosoils, Inc. “Preliminary Geotechnical Investigation, Proposed 14-Lot Subdivision, 4.14 Acres”, the onsite soils are similar to Hydrologic Soil Group (HSG) “C” or “D”. See References for copy of Geotechnical Study. Existing land-use is 4.00 DU/Ac, proposed land-use is 2.84 DU/Ac. The existing drainage sheet flows northwesterly towards Valley Street, where runoff is intercepted by an existing Type F catch basin on the east side of Valley Street in the western corner of the project. The catch basin connects to a 27-inch storm drain pipe underneath Valley Street, which travels northwest towards Buena Vista Way. One point of discharge has been identified at the existing catch basin. There is no run-on from upstream properties.


Description of Proposed Site Development and Drainage Patterns

Project Description / Proposed Land Use and/or Activities: The project proposes the development of 12 residential lots with grading of pads and driveways, a 36-foot wide private cul-de-sac (Yada Place), and the improvement of McCauley Lane and Valley Street. The project also proposes storm drain infrastructure including storm drain pipes, curb inlets, and biofiltration basins for storm water treatment.

List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): The proposed impervious features of the project include 12 single-family residences with driveways, a public cul-de-sac roadway, and sidewalk areas around the perimeter of the development site. The street improvement proposes the extension of the impervious asphalt surfaces on McCauley Lane and Valley Street.

List/describe proposed pervious features of the project (e.g., landscape areas): The proposed pervious features of the project include landscape areas surrounding the proposed residences, the proposed biofiltration basins, and landscape areas between the proposed sidewalks and adjacent streets that are designed to disconnect the impervious surfaces and retain runoff from impervious areas.

Does the project include grading and changes to site topography?

Yes

No Description / Additional Information: Project grading will occur on approximately 3.79 acres of the project. Grading on the site has been minimized to the maximum extent possible. The existing house located east of Lot 12 will remain and will not be a part of this project. The designated area is labeled “Not a Part” on the DMA Exhibit. Storm water flows from impervious roof and driveway areas will be conveyed via the surface flow to the proposed biofiltration basins on each lot. The biofiltration basins will outlet to a proposed storm drain system underneath the proposed lots. The storm drain system will require excavation and installation of underground storm drains. Post-development site flow will mimic existing drainage conditions, and will discharge from the site at below historical flow rates (see Drainage Report for discussion and calculations). Impervious surfaces have been minimized where feasible.

Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)?

Yes

No Description / Additional Information: The project proposes the development of 12 residential lots and grading of pads and driveways, a 36-foot wide private cul-de-sac (Yada Place), and the street improvement of McCauley Lane and Valley Street. The project also proposes storm drain infrastructure including storm drain pipes, curb inlets, and biofiltration basins for storm water treatment. Project grading will occur on approximately 3.79 acres of the project. As part of the street improvement for Valley Street, the existing Type-F catch basin on the east side of Valley Street will be modified into a curb inlet. Drainage patterns reflected on the DMA Exhibit will slightly increase the acreage draining to the modified curb inlet on the east side of Valley Street in the western corner of the project site. Runoff from the proposed roof and driveway areas on Lots 1-8 will be conveyed via surface flow to the front of each lot and onto the proposed cul-de-sac, Yada Place. Yada Place will intersect Valley Street, and run easterly through the center of the project. Yada Place will be graded so that runoff flows towards the northern and southern curb and gutter, which will direct flow to proposed curb inlets located north of Lot 1 and south of Lot 8. The curb inlets will connect to proposed 12”-dia PVC storm drain pipes, which will convey flow to proposed biofiltration basins, Basin 1 and Basin 2. Basin 1 will be located on the west side of Lot 1 and will receive runoff from Lots 1-4. Basin 2 will be located on the west side of Lot 8 and will receive runoff from Lots 5-8. Runoff from the proposed roof and driveway areas on Lots 9-12 will be conveyed via surface flow to the front of each lot and into a proposed 12”-dia PVC storm drain system. The storm drain system will convey flow west and outlet over rip rap at Basin 2. The proposed biofiltration basins will provide storm water treatment and flow detention, and have been sized based on pollutant control sizing factors (see Attachment 1e). Storm water that enters the biofiltration basins will be filtered through the basin’s soil media and directed to a perforated underdrain pipe located at the bottom of the basin. Discharge from Basin 2 will be routed via 12”-dia PVC storm drain pipe, which will connect to the modified curb inlet on the east side of Valley Street. The modified curb inlet will outlet at the existing 27”-dia RCP storm drain underneath Valley Street. Discharge from Basin 1 will be routed via 12”-dia PVC storm drain pipe, which will connect to the existing Type B curb inlet on the east side of Valley Street in the southern portion of the project. The existing curb inlet will also outlet at the existing 27”-dia RCP storm drain underneath Valley Street. All storm water being routed to Basin 1 will travel through the existing storm drain underneath Valley Street and confluence at the historical point of discharge, at the modified curb inlet on the east side of Valley Street in the western corner of the project site. Storm water flow on Yada Place that falls west of the curb inlets will surface flow to Valley Street and flow via curb and gutter to the modified curb inlet on the east side of Valley Street. Runoff from the proposed sidewalks around the perimeter of the project site will be directed towards the landscape areas between the proposed sidewalk and the existing street. These DMAs are designed with the site design BMP- Impervious Area Dispersion- to retain runoff to a level equivalent to the pervious land. See Attachment 1a for calculations for Areas Draining to Self-Retaining DMAs. The proposed biofiltration basins will serve to detain the minor increase in runoff created by the proposed development. Post-development site flow will mimic existing drainage conditions, and will discharge from the site at below historical flow rates.


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): From the project site, runoff flows into an existing storm drain system underneath Valley Street. The storm drain pipe discharges directly to a concrete-lined conveyance channels which outlets at Buena Vista Lagoon and eventually the Pacific Ocean.

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

Identification of Project Site Pollutants* *Identification of project site pollutants is only required if flow-thru treatment BMPs are implemented onsite in lieu of retention or biofiltration BMPs (note the project must also participate in an alternative compliance program unless prior lawful approval to meet earlier PDP requirements is demonstrated)

Identify pollutants expected 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 Expected 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): Project directly discharges to a stabilized conveyance system that discharges into Buena Vista Lagoon.

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: Hydromodification requirements are not required for this project.


Flow Control for Post-Project Runoff* *This Section only required if hydromodification management requirements apply

List and describe point(s) of compliance (POCs) for flow control for hydromodification management (see Section 6.3.1). For each POC, provide a POC identification name or number correlating to the project's HMP Exhibit and a receiving channel identification name or number correlating to the project's HMP Exhibit. Hydromodification requirements are not required for this project.

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: 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 local codes governing minimum street width, sidewalk construction, allowable pavement types, and drainage requirements. The Type-B soil, though generally rated for moderate infiltration capacity, provides some opportunity for infiltration of storm water runoff into the native soils. However, based on the preliminary Geotechnical Investigation prepared by Geosoils, Inc. “Preliminary Geotechnical Investigation, Proposed 14-Lot Subdivision, 4.14 Acres”, the onsite soils are similar to Hydrologic Soil Group (HSG) “C” or “D”. Therefore, the bottom of the biofiltration basins will be lined with an impermeable liner. The biofiltration basin will include an underdrain pipe.

Optional Additional Information or Continuation of Previous Sections As Needed

Source Control BMP Checklist for All Development Projects

(Standard Projects and Priority Development Projects)

Form I-4 Carlsbad BMP Design

Manual [DRAFT]



Project ID: CT 15-11

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 of the Model BMP Design Manual for information to implement source control BMPs shown in this checklist. Answer each category below pursuant to the following.

• "Yes" means the project will implement the source control BMP as described in Chapter 4 and/or Appendix E 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.

• "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: No outdoor material storage areas proposed.

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: No outdoor work areas proposed.

SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal

Yes No N/A

Discussion / justification if SC-4 not implemented: No trash storage areas proposed.


Source Control Requirement Applied?

SC-5 Additional BMPs Based on Potential Sources of Runoff Pollutants (must answer for each source listed below)

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

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

Discussion / justification if SC-5 not implemented. Clearly identify which sources of runoff pollutants are discussed. Justification must be provided for all "No" answers shown above.

Site Design BMP Checklist for All Development Projects

(Standard Projects and Priority Development Projects)

Form I-5 Carlsbad BMP Design

Manual [DRAFT]




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 of the Model BMP Design Manual for information to implement site design BMPs shown in this checklist. Answer each category below pursuant to the following.

• "Yes" means the project will implement the site design BMP as described in Chapter 4 and/or Appendix E 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.

• "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 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: Site previously graded.

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


SD-4 Minimize Soil Compaction Yes No N/A

Discussion / justification if SD-4 not implemented: Site previously graded.

SD-5 Impervious Area Dispersion Yes No N/A



Site Design Requirement Applied?

SD-6 Runoff Collection Yes No N/A


SD-7 Landscaping with Native or Drought Tolerant Species Yes No N/A


SD-8 Harvesting and Using Precipitation Yes No N/A

Discussion / justification if SD-8 not implemented: No rain-water harvesting strategies proposed.

Summary of PDP Structural BMPs

Form I-6 (PDPs)




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 local jurisdiction 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 local jurisdiction 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 (page 3 of this form) 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 or separate. For the purpose of this SWQMP, the proposed site condition has been divided into (2) Drainage Management Areas (DMAs) draining to Biofiltration IMPs, (4) Areas Draining to Self-Retaining DMAs, and (3) Areas Not Feasible to Treat. The DMAs have been delineated based on onsite drainage patters and BMP locations. Biofiltration basins were chosen as the structural BMP for DMAs draining to IMPs. The biofiltration basins have been sized based on the minimum BMP sizing factor of 3% for storm water pollutant control. See Attachment 1e for Worksheet B.5-1: Simple Sizing Methods for Biofiltration BMPs. The DCV for each DMA has been calculated based on a proposed impervious roof and driveway area of 3,800 sf per Lot, with the remaining area as proposed landscape. Worksheet B.5-1 further demonstrates that the DCV can be achieved with biofiltration BMPs. Based on the preliminary Geotechnical Investigation prepared by Geosoils, Inc. “Preliminary Geotechnical Investigation, Proposed 14-Lot Subdivision, 4.14 Acres”, the onsite soils are similar to Hydrologic Soil Group (HSG) “C” or “D”. Infiltration of HSG “C” and “D” soils is very severely limited. Biofiltration basins (BF-1) will be used for pollutant control and peak flow control for the project stormwater runoff. The biofiltration basins will be configured with a 1.5-foot ponding layer above the surface for storage volume, an 18-inch layer of amended soil below the surface, and a 10-inch gravel storage layer below the amended soil layer. Below the gravel layer, the basins are lined to prevent infiltration into the underlying soil. Flows will discharge from the basin via low flow orifice within the gravel layer to the receiving storm drain system. A riser structure will be constructed within the IMP with and an emergency overflow set 1.5-feet above the bottom of the basin, such that peak flows can be safely discharged to the receiving storm drain system.


Structural BMP Summary Information (Copy this page as needed to provide information for each individual proposed structural BMP)

Structural BMP ID No. Basin 1

Construction Plan Sheet No.

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 with prior lawful approval to meet earlier PDP requirements (provide BMP type/description in discussion section below)

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)

Flow-thru treatment control with alternative compliance (provide BMP type/description 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


Who will certify construction of this BMP? Provide name and contact information for the party responsible to sign BMP verification forms if required by the [City Engineer] (See Section 1.12 of the BMP Design Manual)

City of Carlsbad

Who will be the final owner of this BMP?

Yada Family Trust

Who will maintain this BMP into perpetuity?

Yada Family Trust

What is the funding mechanism for maintenance?

Yada Family Trust


Structural BMP Summary Information (Copy this page as needed to provide information for each individual proposed structural BMP)

Structural BMP ID No. Basin 2

Construction Plan Sheet No.

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 with prior lawful approval to meet earlier PDP requirements (provide BMP type/description in discussion section below)

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)

Flow-thru treatment control with alternative compliance (provide BMP type/description in discussion section below)

Detention pond or vault for hydromodification management


Purpose:

Pollutant control only

Hydromodification control only

Combined pollutant control and hydromodification

control

Pre-treatment/forebay for another structural BMP


Who will certify construction of this BMP? Provide name and contact information for the party responsible to sign BMP verification forms if required by the [City Engineer] (See Section 1.12 of the BMP Design Manual)

City of Carlsbad

Who will be the final owner of this BMP?

Yada Family Trust

Who will maintain this BMP into perpetuity?

Yada Family Trust

What is the funding mechanism for maintenance?

Yada Family Trust

ATTACHMENT 1

BACKUP FOR PDP POLLUTANT CONTROL BMPS Attachment Sequence

Contents Checklist

Attachment 1a DMA Exhibit (Required) See DMA Exhibit Checklist on the back of this Attachment cover sheet.

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

Attachment 1a

DMA Exhibit

DMA EXHIBITYADA FAMILY FARM SUBDIVISION

Attachment 1b

Tabular Summary of DMAs and Design Capture Volume Calculations

Surface Name Surface Type Area (ft2)R1 Conventional Roof Driveway and Patio 15,200

AC1 Asphalt Street 8,90024,100

Surface Name Surface Type Area (ft2)

L1 Landscape 52,640

52,640

55,840

43%D

0.67

0.6

1,874

DMA Surface Tabulation to Support Biofiltration of Design Capture Volume (DCV) Determination

DMA Name – DMA 1

Total Impervious Area (ft2)

DMA Impervious Area Tabulation

DMA Runoff Coefficient “C” )

85th Percentile Rainfall (I)

Design Capture Volume (DVC) = (C)(I)(A) ⁄ 12

Total DMA (A)

Total Impervious Area (ft2) ⁄ Total DMA (ft2) = Percent ImperviousSoil Type

Total Pervious Area (ft2)

DMA Pervious Area Tabulation

Surface Name Surface Type Area (ft2)R2 Conventional Roof Driveway and Patio 30,400

AC2 Asphalt Street 8,73039,130

Surface Name Surface Type Area (ft2)

L2 Landscape 65,232

65,232

95,632

41%D

0.57

0.6

2,739

DMA Runoff Coefficient “C”

85th Percentile Rainfall (I)

Design Capture Volume (DVC) = (C)(I)(A) ⁄ 12

Soil Type

Total Pervious Area (ft2)

Total DMA (A)

Total Impervious Area (ft2) ⁄ Total DMA (ft2) = Percent Impervious

Total Impervious Area (ft2)

DMA Pervious Area Tabulation

DMA Surface Tabulation to Support Biofiltration of Design Capture Volume (DCV) Determination

DMA Name – DMA 2

DMA Impervious Area Tabulation

Surface Name Surface Type Area (ft2)Runoff Factor

Area x Runoff Factor

PCC5 Conventional Concrete 1,956 1.0 1,9561,956

1,946Landscape

1;10.5 in3,902

Ratio of (A) to (B)Pond Depth withing Self-Retaining Area

Total Area of DMA

DMA Name - SR-1

Adjusted Surface Draining to Self-Retaining Area - (A).Receiving Self-Retaining Surface Area - (B)

Self-Retaining Surface Area Type

Tabulation of Areas Draining to Self-Retaining DMAs



PCC6 Conventional Concrete 480 1.0 480480

462Landscape

1;10.5 in942


Total Area of DMA

Tabulation of Areas Draining to Self-Retaining DMAs DMA Name - SR-2





PCC7 Conventional Concrete 1,097 1.0 1,0971,097

1,084Landscape

1;10.5 in2,181


Total Area of DMA

Tabulation of Areas Draining to Self-Retaining DMAs DMA Name - SR-3



Surface Name Surface TypePCC8 Conventional ConcreteL15 Landscape

Subtototal Areas Not Feasbile to Treat 279Comment: Small portion of the proposed sidewalk at the intersection of McCauley Lane and Valley Street as part of the street improvement will flow to the existing storm drain at the southwest corner of the project on Valley Street.

Tabulation of Areas Not Feasible to Treat DMA Name – NF-1

Area (ft2)23346

Surface Name Surface TypeAC3 Conventional AsphaltL15 Landscape

Subtototal Areas Not Feasbile to Treat 1,718Comment: Small portion of the proposed asphalt and sidewalk at the intersection of the proposed cul-de-sac and Valley Street will flow to the existing storm drain at the southwest corner of the project on Valley Street.


Area (ft2)1,592126

Surface Name Surface TypePCC6 Conventional Concrete

Subtototal Areas Not Feasbile to Treat 361Comment: Small portion of the proposed sidewalk at the intersection of Buena Vista Drive and Valley Street as part of the street improvement will flow to the existing storm drain at the northwest corner of the project on Valley Street.


Area (ft2)361

DMA Classification Quantity Subtotal DMA (ft2) Subtotal DMA (acres)Self-Mitigating DMAs 0 0 0

Self-Retaining DMAs 0 0 0

Surfaces Draining to Self-Retaining DMAs 4 11,267 0.26

Bioretention IMPs 14 150,966 3.47Flow Through Planter IMPs 0 0 0

Infiltration IMP 0 0 0

Conventional Vegetated Swale 0 0 0Extended (Dry) Detention Basins 0 0 0

Media (Sand) Filter 0 0 0Wet Pond 0 0 0

Constructed Wetland 0 0 0

Proprietary Vault/Tree Well 0 0 0Proprietary Inlet Filter 0 0 0

Areas Not Feasible to Treat 3 2,358 0.05

Total Project DMA 164,591 3.78

Total Parcel Area 199,024 4.57

Comment:

Summary of DMA Treatment Practices

Attachment 1c

Form I-7, Harvest and Use Feasibility Screening Checklist

Harvest and Use Feasibility Checklist

Form I-7

1. Is there a demand for harvested water (check all that apply) at the project site that is reliably present during the wet season? Toilet and urinal flushing Landscape irrigation Other: ______________

2. If there is a demand; estimate the anticipated average wet season demand over a period of 36 hours. Guidance for planning level demand calculations for toilet/urinal flushing and landscape irrigation is provided in Section B.3.2. Modified ETWU = EToWet x [[∑(PF x HA)/IE] + SLA] x 0.015 Using an average value for HA from the 14 lots and Moderate Plant Water Use (per Table B.3-2); Modified ETWU = 2.7 x [[(0.5 x 13,160)/0.9] + 0] x 0.015 Modified ETWU= 296

3. Calculate the DCV using worksheet B-2.1. DCV = ___368_______ (cubic feet)

3a. Is the 36 hour demand greater than or equal to the DCV?

Yes / No

3b. Is the 36 hour demand greater than 0.25DCV but less than the full DCV?

Yes / No

3c. Is the 36 hour demand less than 0.25DCV?

Yes

Harvest and use appears to be feasible. Conduct more detailed evaluation and sizing calculations to confirm that DCV can be used at an adequate rate to meet drawdown criteria.

Harvest and use may be feasible. Conduct more detailed evaluation and sizing calculations to determine feasibility. Harvest and use may only be able to be used for a portion of the site, or (optionally) the storage may need to be upsized to meet long term capture targets while draining in longer than 36 hours.

Harvest and use is considered to be infeasible.

Is harvest and use feasible based on further evaluation? Yes, refer to Appendix E to select and size harvest and use BMPs. No, select alternate BMPs

Attachment 1d

Form I-8, Categorization of Infiltration Feasibility Condition

Categorization of Infiltration Feasibility Condition Form I-8 Part 1 - Full Infiltration Feasibility Screening Criteria Would infiltration of the full design volume be feasible from a physical perspective without any undesirable consequences that cannot be reasonably mitigated?

Criteria Screening Question Yes No

1

Is the estimated reliable infiltration rate below proposed facility locations greater than 0.5 inches per hour? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2 and Appendix D.

No

Provide basis:

2

Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of geotechnical hazards (slope stability, groundwater mounding, utilities, or other factors) that cannot be mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2.

Yes No

Provide basis:

Form I-8 Page 2 of 4 Criteria Screening Question Yes No

3

Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of groundwater contamination (shallow water table, storm water pollutants or other factors) that cannot be mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3.

No

Provide basis:

4

Can infiltration greater than 0.5 inches per hour be allowed without causing potential water balance issues such as change of seasonality of ephemeral streams or increased discharge of contaminated groundwater to surface waters? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3.

No

Provide basis:

Part 1 Result

*

If all answers to rows 1 - 4 are “Yes” a full infiltration design is potentially feasible. The feasibility screening category is Full Infiltration If any answer from row 1-4 is “No”, infiltration may be possible to some extent but would not generally be feasible or desirable to achieve a “full infiltration” design. Proceed to Part 2

No

Attachment 1e

Pollutant Control BMP Design Worksheets / Calculations

Basin 1

Worksheet B.5-11 Remaining DCV after implementing retention BMPs 1,874 cubic-feet

2 Infiltration rate from Worksheet D.5-1 if partial infltration is feasible 0.2 in/hr.

3 Allowable drawdown time for aggregate storage below the underdrain 36 hours4 Depth of runoff that can be infiltrated [Line 2 x Line 3] 7.2 inches

5 Aggregate pore space 0.4 in/in6 Required depth of gravel below the underdrain [Line 4 / Line 5] 18 inches7 Assumed surface area of the biofiltration BMP 1,125 sq-ft

8 Media retained pore space 0.1 in/in9 Volume retained by BMP [[Line 4 + (Line 12 x Line 8)]/12] x Line 7 844 cubic-feet

10 DCV that requires biofiltration [Line 1 - Line 9] 1,030 cubic-feet

11 Surface Ponding [6 inch minimum, 12 in maximum] 3 inches12 Media Thickness [18 inches minimum] 18 inches13

14 Media available pore space 0.2 in/in15 Media filtration rate to be used for sizing 5 in/hr.

16 Allowable Routing Time for sizing 6 hours17 Depth filtered during storm [Line 15 x Line 16] 30 inches18 Depth of Detention Storage

[Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)]19 Total Depth Treated [Line 17 + Line 18] 39.8 inches

20 Required biofiltered volume [1.5 x Line 10] 1,546 cubic-feet21 Required Footprint [Line 20 / Line19] x 12 466 sq-ft

22 Required Storage (surface + pores) Volume [0.75 x Line 10] 773 cubic-feet23 Required Footprint [Line 22 / Line 18] x 12 946 sq-ft

24 Area draining to the BMP 55,840 sq-ft25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and B.2) 0.6726 Minimum BMP Footprint [Line 24 x Line 25 x 0.03] 1,124 sq-ft27 Footprint of the BMP = Maximum(Line 21, Line 23, Line 26) 1,124 sq-ft

Used BMP Footprint 1,125 sq-ft

Simple Sizing Method for Biofiltration BMPs

Partial Retention

BMP Parameters

Footprint of the BMP

9.8

Baseline Calculation

inches

Option 2 - Store 0.75 of remaining DCV in pores and ponding

Option 1 - Biofilter 1.5 times the DCV

Aggregate Storage above underdrain invert (12 inches typical - use 0 inches for sizing if aggregate is not over the entire bottom surface area

8 inches

Basin 2

Worksheet B.5-11 Remaining DCV after implementing retention BMPs 2,739 cubic-feet

2 Infiltration rate from Worksheet D.5-1 if partial infltration is feasible 0.2 in/hr.

3 Allowable drawdown time for aggregate storage below the underdrain 36 hours4 Depth of runoff that can be infiltrated [Line 2 x Line 3] 7.2 inches

5 Aggregate pore space 0.4 in/in6 Required depth of gravel below the underdrain [Line 4 / Line 5] 18 inches7 Assumed surface area of the biofiltration BMP 1,645 sq-ft

8 Media retained pore space 0.1 in/in9 Volume retained by BMP [[Line 4 + (Line 12 x Line 8)]/12] x Line 7 1,234 cubic-feet

10 DCV that requires biofiltration [Line 1 - Line 9] 1,506 cubic-feet

11 Surface Ponding [6 inch minimum, 12 in maximum] 3 inches12 Media Thickness [18 inches minimum] 18 inches13

14 Media available pore space 0.2 in/in15 Media filtration rate to be used for sizing 5 in/hr.

16 Allowable Routing Time for sizing 6 hours17 Depth filtered during storm [Line 15 x Line 16] 30 inches18 Depth of Detention Storage

[Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)]19 Total Depth Treated [Line 17 + Line 18] 40.6 inches

20 Required biofiltered volume [1.5 x Line 10] 2,258 cubic-feet21 Required Footprint [Line 20 / Line19] x 12 667 sq-ft

22 Required Storage (surface + pores) Volume [0.75 x Line 10] 1,129 cubic-feet23 Required Footprint [Line 22 / Line 18] x 12 1,278 sq-ft

24 Area draining to the BMP 95,632 sq-ft25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and B.2) 0.5726 Minimum BMP Footprint [Line 24 x Line 25 x 0.03] 1,644 sq-ft27 Footprint of the BMP = Maximum(Line 21, Line 23, Line 26) 1,644 sq-ft

Used BMP Footprint 1,645 sq-ft

Simple Sizing Method for Biofiltration BMPs

Partial Retention

BMP Parameters

Aggregate Storage above underdrain invert (12 inches typical - use 0 inches for sizing if aggregate is not over the entire bottom surface area

10 inches

Option 1 - Biofilter 1.5 times the DCV

Option 2 - Store 0.75 of remaining DCV in pores and ponding

Footprint of the BMP

Baseline Calculation

10.6 inches

ATTACHMENT 2

STRUCTURAL BMP MAINTENANCE INFORMATION

Attachment Sequence

Contents Checklist

Attachment 2a Structural BMP Maintenance Thresholds and Actions (Required)

Included See Structural BMP Maintenance Information Checklist on the back of this Attachment cover sheet.

Attachment 2b Draft Maintenance Agreement (when applicable)

Included

Not Applicable

Attachment 2a

Structural BMP Maintenance Thresholds and Actions

Bio Retention Basin Inspection & Maintenance Checklist

Property: Olive Hill Road, Bonsall

Property Owner: Pardee Homes

Date of Inspection:_________ Inspector(s) Name:_____________________________

Address:_____________________________

Basin Location: DMA #____ Phone:________________________________

Type of Inspection Monthly pre-wet season After heavy runoff( 1" or greater)

End of wet season other:__________

Y=Yes N=No MR=Maintenance Required NA= Not Applicable

Vegetation & Irrigation:

Vegetation is dead or diseasedVegetation & Irrigation systems in good conditionOvergrown Neat and orderly in appearance

Required Maintenance:

Soil:Too deep or too shallow(the distance from the top of mulch to the top of riser pipe shall be 4")


Page1of 3

Mulch:Missing or Patchy in AppearanceDepth of mulch layer less than 3-inAreas of Bare earth


Sediment, Trash & Debris:

Accumulated sediment, trash,and debris presentDrain time exceeds 4 hours


Clogs: Soil too deep or too shallowaccumulated sediment, trash and debrisDrain time more than 5 days after rainfall


Structural Components:

Flow to basin is impededinflow pipes or downspouts are cloged/damageddamaged splash/rock blocksOver flow pipe in damaged or clogedUnderdrain pipes cloged or damagedPlanter is cracked, leaking or falling apart

Page 2 of 3


Inspector Signature:______________________ Date:__________________

Inspector Signature:______________________ Date:__________________

The basin shall be drained within 5 days after each storm event, standing water for more than 5 days will cause mosquito breeding, contact County of San Diego Vector ControlProgram at (858) 694-2888.** The Responsible Party shall retail the maintenance/inspection records for a minimum of 5 years from the date of maintenance.The records shall be made available to the County of San Diego for inspection upon request at any time. Page 3of 3

Attachment 2b

Draft Maintenance Agreement

I. Purpose and Scope

This section was prepared based on the Chapter 7 of San Diego Region Model BMP Design Manual The goal is to insure that the Project proponent accepts responsibility for all facilities maintenance, repair, and replacement from the time they are constructed until the ownership and maintenance responsibilities is formally transferred to the new owner. Facilities shall be maintained in perpetuity and comply with the City’s self-inspection, reporting, and verification requirements.

II. Inspection, Maintenance Log and Self-Verification Forms

Fill the forms on the following pages for each BMP using the maintenance schedule here and the inspection-maintenance checklists in Section VII. These forms shall be signed by the responsible party and retained for at least (5) years. Use the Water Quality Technical Report Exhibit for the location of BMPs. (Make duplicate copies of these forms and fill out those, not the original ones.)

III. Updates, Revisions and Errata

This maintenance plan is a living document and based on the changes made by maintenance personnel, such as replacement of mechanical equipments, addition maintenance procedure shall be added and maintenance plan shall be kept up to date.

Please add the revisions and updates to the maintenance plan to this section if any, these revisions maybe transmitted to the County at any time. However, at a minimum, updates to the maintenance plan must accompany the annual inspection report.

IV. Introduction The Yada Family Farm Subdivision project located at 1835 Buena Vista Way, City of Carlsbad. The proposed grading is a 3.48-acres on a 4.57 acre site. The site is bounded by existing nursery to the east, Valley Street to the west, McCauley Lane to the south, and Buena Vista Way to the north. The 4.57 acre property in the past has been used for agriculture purposes, with an existing residential house in the northeast corner of the site, and fields and remnants of several shade canopy structures associated with nursery activities on the remaining portions of the property. The project proposes the development of 12 residential lots and grading of pads and driveways, a public cul-de-sac, and the improvement of Buena McCauley Lane and Valley Street. The project also proposes two (2) biofiltration basins for storm water treatment and detention. The biofiltration basins will discharge into a proposed storm drain system, which will outlet into the existing storm drain system underneath Valley Street.

V. Responsibility for Maintenance

A. General Yada Family Trust will enter into a Stormwater Facilities Maintenance Agreement (SWFMA) with the City of Carlsbad to maintain designated facilities herein this section for the Yada Family Farm Subdivision.

The SWFMA will serve as the mechanism to ensure that proper inspection and maintenance is done in an efficient and timely manner.

Responsible Party Jim Yada c/o Yada Family Trust 31 Rolling Green Irvine, CA 92620 Yada Family Trust will have the direct responsibility for maintenance of Stormwater controls. A Home Owner’s Association (HOA) shall be formed, or establish another mechanism to the satisfaction of the City. Funding for the maintenance activities shall be provided by Yada Family Trust, the HOA, or other mechanism to the satisfaction of the City.

Whenever the property is sold and whenever designated individual change, immediately the updated contact information must be provided to the City of Carlsbad.

B. Staff Training Program

Staff training and education program shall be carried out twice a year, once prior to the rainy season (October 1st) and once during the early dry season (April 30th).

The inspection and maintenance training program consists of the operation and function of the biofiltration basins. Please refer to the sections VI and VII for fact sheets and checklists.

It is the responsibility of Yada Family Trust to convey the maintenance and inspection information to the employees. Maintenance personnel must be qualified to properly maintain stormwater management facilities. Inadequately trained personnel can cause additional problems resulting in additional maintenance costs.

C. Records Yada Family Trust shall retain education, inspection, and maintenance forms and documents for at least five (5) years.

D. Safety Keep safety considerations at the forefront of inspection procedures at all times. Likely hazards should be anticipated and avoided. Never enter a confined space (outlet structure, manhole, etc) without proper training or equipment. A confined space should never be entered without at least one additional person present. If a toxic or flammable substance is discovered, leave the immediate area and contact the local Sheriff at 911. Potentially dangerous (e.g., fuel, chemicals, hazardous materials) substances found in the areas must be referred to the local Sheriff’s Office immediately for response by the Hazardous Materials Unit. The emergency contact number is 911. Vertical drops may be encountered in areas located within and around the facility. Avoid walking on top of retaining walls or other structures that have a significant vertical drop. If a vertical drop

is identified within the pond that is greater than 48” in height, make the appropriate note/comment on the maintenance inspection form.

VI. Summary of Drainage Areas and Stormwater Facilities

A. Drainage Areas The proposed project involves the grading of 12 pads for single family residences, a public cul-de-sac (Yada Place), the street improvement of McCauley Lane and Valley Street, and storm drain infrastructure. As part of the street improvement for Valley Street, the existing Type F catch basin on the east side of Valley Street will be modified into a curb inlet. Drainage patterns reflected on the DMA Exhibit will slightly increase the acreage draining to the modified curb inlet on the east side of Valley Street in the western corner of the project site. For the purpose of this SWQMP, the proposed site condition has been divided into (2) Drainage Management Areas (DMAs) draining to Biofiltration IMPs, (4) Areas Draining to Self-Retaining DMAs, and (3) Areas Not Feasible to Treat. The DMAs have been delineated based on onsite drainage patters and BMP locations. Biofiltration basins were chosen as the structural BMP for DMAs draining to IMPs. Runoff from the proposed roof and driveway areas on Lots 1-8 will be conveyed via surface flow to the front of each lot and onto the proposed cul-de-sac, Yada Place. Yada Place will intersect Valley Street, and run easterly through the center of the project. Yada Place will be graded so that runoff flows towards the northern and southern curb and gutter, which will direct flow to proposed curb inlets located north of Lot 1 and south of Lot 8. The curb inlets will connect to proposed 12”-dia PVC storm drain pipes, which will convey flow to proposed biofiltration basins, Basin 1 and Basin 2. Basin 1 will be located on the west side of Lot 1 and will receive runoff from Lots 1-4. Basin 2 will be located on the west side of Lot 8 and will receive runoff from Lots 5-8. Runoff from the proposed roof and driveway areas on Lots 9-12 will be conveyed via surface flow to the front of each lot and into a proposed 12”-dia PVC storm drain system. The storm drain system will convey flow west and outlet over rip rap at Basin 2. The proposed biofiltration basins will provide storm water treatment and flow detention, and have been sized based on pollutant control sizing factors in the Storm Water Quality Management Plan for this project. Storm water that enters the biofiltration basins will be filtered through the basin’s soil media and directed to a perforated underdrain pipe located at the bottom of the basin. Discharge from Basin 2 will be routed via 12”-dia PVC storm drain pipe, which will connect to the modified curb inlet on the east side of Valley Street. The modified curb inlet will outlet at the existing 27”-dia RCP storm drain underneath Valley Street. Discharge from Basin 1 will be routed via 12”-dia PVC storm drain pipe, which will connect to the existing Type B curb inlet on the east side of Valley Street in the southern portion of the project. The existing curb inlet will also outlet at the existing 27”-dia RCP storm drain underneath Valley Street. All storm water being routed to Basin 1 will travel through the existing storm drain underneath Valley Street and confluence at the historical point of discharge, at the modified curb inlet on the east side of Valley Street in the western corner of the project site. Storm water flow on Yada Place that falls west of the curb inlets will surface flow to Valley Street and flow via curb and gutter to the modified curb inlet on the east side of Valley Street. Runoff from the proposed sidewalks around the perimeter of the project site will be directed towards the landscape areas between the proposed sidewalk and the existing street. These DMAs

are designed with the site design BMP- Impervious Area Dispersion- to retain runoff to a level equivalent to the pervious land. See Attachment 1a for calculations for Areas Draining to Self-Retaining DMAs. The proposed biofiltration basins will serve to detain the minor increase in runoff created by the proposed development. Post-development site flow will mimic existing drainage conditions, and will discharge from the site at below historical flow rates.

B. Treatment and Flow-Control Facilities

All stormwater runoff will be treated by the biofiltration basins. The treated runoff will percolate into the existing ground as much as possible, with an overflow and under-drain outlet connecting to the proposed storm drain system. The proposed storm drain system will outlet to the existing storm drain system underneath Valley Street.

See the DMA Exhibit for the location of BMPs.

The biofiltration basins are designed to treat and detain runoff and allow percolation into the underlying soil. Pollutants are removed as the runoff passes through the soil layer and the underlying layer of gravel or drain rock. There will be an overflow outlet, which will convey flows that exceed the capacity of the basins. The basins for this Project are sized for pollutant control only, based on the San Diego Region Model BMP Design Manual.

VII. Facility Documentation

Please see the following pages regarding the BMPs details and maintenance fact sheets.

VIII. Maintenance Schedule and Checklist

Fill out the Checklists in the following pages for each BMP. The Required Maintenance activities are at the end of this section. At the discretion of the Project proponent, a qualified Stormwater company may be hired to perform the required inspection and maintenance and provide necessary reports.

PRIVATE TREATMENT CONTROL BMP OPERATION AND MAINTENANCE VERIFICATION FORM

BIORETENTION FACILITIES, VEGETATED SWALES & HIGHER RATE BIOFILTERS

______________________________________________________________________________ Signature of Responsible Party Print Name Date

1. Transcribe the following information from your notification letter and make corrections as necessary:

Permit No.:

BMP Location:

Responsible Party:

Phone Number: ( ) Email:

Responsible Party Address: Number Street Name & Suffix City/Zip

Check here for Address or phone number change 2. Using the Table below, please describe the inspections and maintenance activities that have been conducted during the fiscal year (July 1 – June 30), and date(s) maintenance was performed. Under “Results of Inspection,” indicate whether maintenance was required based on each inspection, and if so, what type of maintenance. If maintenance

was required, provide the date maintenance was conducted and a description of the maintenance. REFER TO THE BACK OF THIS SHEET FOR MORE INFORMATION DESCRIBING TYPICAL MAINTENANCE INDICATORS AND MAINTENANCE ACTIVITIES. If no maintenance was required

based on the inspection results, state “no maintenance required.”

What To Look For? Date

Inspected

Results of Inspection:

Work needed? (Yes/No)

Date Maintenance Completed and

Description of Maintenance Conducted

Accumulation of Sediment, Litter,

Grease

Standing Water

Erosion

Overgrown Vegetation

Poor Vegetation Establishment

Structural Damage

3. Attach copies of available supporting documents (photographs, copies of maintenance contracts, and/or maintenance records). 4. Sign the bottom of the form and return to: County of San Diego Watershed Protection Program

Treatment Control BMP Tracking 5201 Ruffin Road, Suite P, MS 0326 San Diego, CA 92123 OR Email: [email protected]

PRIVATE TREATMENT CONTROL BMP OPERATION AND MAINTENANCE VERIFICATION FORM

BIORETENTION FACILITIES, VEGETATED SWALES & HIGHER RATE BIOFILTERS-SIDE 2

This guide sheet provides general indicators for maintenance only and for a wide array of treatment

control BMPs. Your developer prepared maintenance plans specifically for your treatment control

BMP as an appendix to the Stormwater Management Plan. Also, if you have a manufactured

structure, please refer to the manufacturer’s maintenance instructions.

Biofilters include the following : Vegetated Filter Strip/Swale Bioswale Bioretention Facility Planter Boxes Manufactered Higher-Flow-Rate Biofilters, such as Tree-Pit-Style Units. Routine maintenance is needed to ensure that flow is unobstructed, that erosion is prevented, and that soils are held together by plant roots and are biologically active. Typical maintenance consists of the following:

Bioretention BMPs Inspection and Maintenance Checklist

Typical Maintenance Indicators Typical Maintenance Actions

Accumulation of sediment (over 2 inches deep or covers vegetation), litter, or debris

Remove and properly dispose of accumulated materials, without damage to the vegetation. Confirm that soil is not clogging and that the area drains after a storm event. Till or replace soil as necessary.

Poor vegetation establishment Ensure vegetation is healthy and dense enough to provide filtering and to protect soils from erosion. Replenish mulch as necessary (if less than 3 inches deep), remove fallen leaves and debris, prune large shrubs or trees, and mow turf areas.

Overgrown vegetation—woody vegetation not part of design is present and grass excessively tall (greater than 10 inches)

Mow or trim as appropriate, but not less than the design height of the vegetation (typically 4-6 inches for grass). Confirm that irrigation is adequate and not excessive and that sprays do not directly enter overflow grates. Replace dead plants and remove noxious and invasive weeds.

Erosion due to concentrated irrigation flow Repair/re-seed eroded areas and adjust the irrigation.

Erosion due to concentrated stormwater runoff flow Repair/re-seed eroded areas and make appropriate corrective measures such as adding erosion control blankets, adding stone at flow entry points, or re-grading where necessary.Remove obstructions and sediment accumulations so water disperses.

Standing water (BMP not draining) . If mosquito larvae are present and persistent, contact the San Diego County Vector Control Program at (858) 694-2888. Mosquito larvicides should be applied only when absolutely necessary and then only by a licensed individual or contractor.

Where there is an underdrain, such as in planter boxes and manufactured biofilters, check the underdrain piping to make sure it is intact and unobstructed. Abate any potential vectors by filling holes in the ground in and around the biofilter facility and by insuring that there are no areas where water stands longer than 96 hours following a storm .

Obstructed inlet or outlet structure Clear obstructions.

Damage to structural components such as weirs, inlet, or outlet structures

Repair or replace as applicable.

Before the wet season and after rain events: remove sediment and debris from screens and overflow drains and downspouts; ensure pumps are functioning, where applicable; check integrity of mosquito screens; and; check that covers are properly seated and locked.

Where cisterns are part of the system

For manufactured high-flow-rate biofilters, see manufacturer’s maintenance guidelines

Stormwater Facility Operation and Maintenance Fact Sheet ► BIORETENTION FACILITIES

These facilities remove pollutants primarily by filtering runoff slowly through aerobic, biologically active soil. Routine maintenance is needed to ensure that flow is unobstructed, that erosion is prevented, and that soils are held together by plant roots and are biologically active. Typical maintenance consists of the following:

Inspect inlets for channels, exposure of soils, or other evidence of erosion. Clear any obstructions and remove any accumulation of sediment. Examine rock or other material used as a splash pad and replenish if necessary.

Inspect outlets for erosion or plugging.

Inspect side slopes for evidence of instability or erosion and correct as necessary.

Observe the surface of bioretention facility soil for uniform percolation throughout. If portions of the bioretention facility do not drain within 24 hours after the end of a storm, the soil should be tilled and replanted. Remove any debris or accumulations of sediment.

Confirm that check dams and flow spreaders are in place and level and that rivulets and channelization are effectively prevented.

Examine the vegetation to ensure that it is healthy and dense enough to provide filtering and to protect soils from erosion. Replenish mulch as necessary, remove fallen leaves and debris, prune large shrubs or trees, and mow turf areas. When mowing, remove no more than 1/3 height of grasses. Confirm that irrigation is adequate and not excessive and that sprays do not directly enter overflow grates. Replace dead plants and remove noxious and invasive vegetation.

Abate any potential vectors by filling holes in the ground in and around the bioretention facility and by insuring that there are no areas where water stands longer than 48 hours following a storm. If mosquito larvae are present and persistent, contact the San Diego County Vector Control Program for information and advice. Mosquito larvicides should be applied only when absolutely necessary and then only by a licensed individual or contractor.

ATTACHMENT 3

SINGLE-SHEET BMP (SSBMP) PLAN

SINGLE SHEET BMP SITE PLANYADA FAMILY FARM SUBDIVISION, CITY OF CARLSBAD

Figures

Soil Type Exhibit

Geotechnical Study

prepared for: prepared by: bha inc

Documents