The URL can be used to link to this page

Home My WebLink AboutCT 15-11; YADA FAMILY FARM SUBDIVISION; PRIORITY DEVELOPMENT PROJECT STORM WATER MITIGATION; 2016-04-05I CT 15-11 CITY OF CARLSBAD ENGINEERING DIVISION PRIORITY DEVELOPMENT PROJECT STORM WATER MITIGATION PLAN FOR YADA FAMILY FARM SUBDIVISION 1835 BUENA VISTA WAY ENGINEER OF WORK --~ ------:=? l_-~/lf/~ 4-?-1;? B CE RICE RCE 60676-EXP 12-31-2016 DATE PREPARED FOR: Jim Yada c/o Yada Family Trust 31 Rolling Green Irvine, CA 92620 PREPARED BY: b~A, Inc land plar1n1r1Q c1v1l engineenng surveying 5115 Avenida Encinas, Suite L Carlsbad, CA 92008 760-931-8700 April 5, 2016 W.O. 993-1289-401 I TABLE OF CONTENTS Certification Page Project Vicinity Map FORM 1-1 Storm Water Standards Questionnaire (E-34) (Standard Project or PDP) FORM 1-2 Project Type Determination Checklist FORM I-3B Site Information Checklist for PDPs FORM 1-4 Source Control BMP Checklist for All Development Projects FORM 1-5 Site Design BMP Checklist for All Development Projects FORM 1-6 Summary of PDP Structural BMPs Attachment 1: Backup for PDP Pollutant Control BMPs Attachment 1a: DMA Exhibit Attachment 1b: Tabular Summary ofDMAs 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 1 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 B~IP Design Manual sections and/ or separate forms referenced in each step below. Step Answer Progression Step 1: Is the project a "development project"? See ~ Yes Go to Step 2. Section 1.3 of the B~IP Design Manual for guidance. 0 No Stop. Permanent B~IP requirements do not apply. No SWQ~ 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 0 Standard Stop. Development Project (PDP), or exception to PDP Project Standard Project requirements apply, definitions? including Standard Project SWQ~. To answer this item, see Section 1.4 of the B~IP Design ~PDP PDP requirements apply, including Manual in its entirety for guidance, AND complete Form I-2, Project Type Determination. PDPSWQ~. Go to Step 3. D Exception Stop. to PDP Standard Project requirements apply. definitions Provide discussion and list any additional requirements below. Prepare Standard Project SWQ~IP. Discussion / justification, and additional requirements for exceptions to PDP definitions, if applicable: Form 1-1 Page 2 Step Answer Progression Step 3. Is the project subject to earlier PDP DYes Consult the [City Engineer] to requirements due to a prior lawful approval? See determine requirements. Provide Section 1.10 of the BMP Design Manual for discussion and identify guidance. requirements below. Go to Step 4. [gl No BMP Design Manual PDP requirements apply. Go to Step 4. Discussion I justification of prior lawful approval, and identify requirements (not required if prior lauful approval does not app!J): Step 4. Do hydromodification control requirements DYes PDP structural BMPs required for apply? pollutant control (Chapter 5) and See Section 1.6 of the BMP Design Manual for hydromodification control (Chapter guidance. 6). Go to Step 5. [gl No Stop. PDP structural BMPs required for pollutant control (Chapter 5) only. Provide brief discussion of exemption to hydromodification control below. Discussion I justification if hydromodification control requirements do not apply: Step 5. Does protection of critical coarse sediment DYes Management measures required for yield areas apply? protection of critical coarse sediment See Section 6.2 of the BMP Design Manual for yield areas (Chapter 6.2). guidance. Stop. [gl No Management measures not required for protection of critical coarse sediment yield areas. Provide brief discussion below. Stop. Discussion I justification if protection of critical coarse sediment yield areas does not apply: No critical course sediment yield areas apply. Project Type Determination Checklist Form 1-2 Project Information Project Name: Yada Family Farm Subdivision Project ID: CT 15-11 Project Type Determination: Standard Project or Priority Development Project (PDP) The project is (select one): ~ New Development 0 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 lZl D (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 D lZl 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 lZl D 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 defmed as any paved impervious surface used for the transportation of automobiles, trucks, motorcycles, and other vehicles. Yes No (d) D r8] Yes No (e) D r8] Yes No (f) D Form 1-2 Page 2 of2 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 Spelial Biological Significance f?y the State Water Board and San Diego Water Board; State Water Quality Protected Areas; water bodies designated with the RARE benejilial use f?y the State Water Board and San Diego Water Board; and a'!Y other equivalent environmental/)' sensitive areas which have been identified f?y the Copermittees. See BMP Design Manual Section 1.4.2 for additional guidance. New development projects that support one or more of the following uses: (iii) Automotive repair shops. This category is deflned 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 Trafflc (ADT) of 100 or more vehicles per day. 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 1.4.2Joradditionalguidance. Does the project meet the defmition of one or more of the Priority Development Project categories (a) through (f) listed above? D No -the project is not a Priority Development Project (Standard Project). r8] 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)*1 00: % The percent impervious surface created or replaced is (select one based on the above calculation): D less than or equal to flfty percent (50%)-only new impervious areas are considered PDP OR D 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 I\ssessor's Parcel Number(s) (.\PN(s)) 156-220-01 Project ID PDS2015-LDGR.."\fj-30047; PDS2015-LDMJIP-50015 Project Watershed (Hydrologic Unit) Select One: 0 Santa Margarita 902 0 San Luis Rey 903 I:8J Carlsbad 904 0 San Dieguito 905 0 Penasquitos 906 0 San Diego 907 0 Pueblo San Diego 908 0 Sweetwater 909 0 Otay 910 0 Tijuana 911 Project Hydrologic Unit Hydrologic .\rea Select One: 0 Loma Alta 904.1 I:8J Buena Vista Creek 904.2 0 Agua Hedionda 904.3 0 Encinas 904.4 D San Marcos 904.5 0 Escondido Creek 904.6 Parcel Area (total area of .\ssessor's Parcel(s) associated with the 4.57 Acres ( 199 024 Square Feet) project) Area to be disturbed by the project 3.79 .\cres ( 165 097 Square Feet) (Project .\rea) Project Proposed Impervious Area 1.56 Acres ( 67 851 Square Feet) (subset of Project Area) Project Proposed Pervious Area 2.23 Acres ( 97 246 Square Feet) (subset of Project Area) Note: Proposed Impervious Area+ Proposed Pervious .\rea= 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): D Existing development rgj Previously graded but not built out rgj Agricultural or other non-impervious use rgj 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 comer 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): D Vegetative Cover rgj Non-Vegetated Pervious Areas rgj Impervious Areas Description / Additional Information: Property has an existing residential house in the northeast comer 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): D NRCSTypeA rgj NRCS Type B 0NRCSTypeC 0NRCSTypeD Approximate Depth to Groundwater (GW): D GW Depth < 5 feet D 5 feet < GW Depth < 10 feet D 10 feet < GW Depth < 20 feet rgj GW Depth> 20 feet Existing Natural Hydrologic Features (select all that apply): ~ \Vatercourses D Seeps D Springs D Wetlands D None Description / Additional Information: There are no existing natural hydrologic features. i Form I-3B Page 3 of9 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 ArcG IS 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 I Ac, proposed land-use is 2.84 DU I A c. 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. Form I-3B Page 4 of9 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 bioflitracion 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 bioflitracion 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? IZ! Yes D No Description / Additional Informacion: 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 bioflitracion basins on each lot. The bioflitracion 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 0 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 (Y ada 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 bioflitration 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, Y ada Place. Y ada 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 bioflltration 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 S-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 bioflltration 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 bioflltration 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 ofValley 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 la for calculations for Areas Draining to Self-Retaining DMAs. The proposed bioflitration 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. Form I-3B Page 5 of9 Identify whether any of the following features, activities, and/ or pollutant source areas will be present (select all that apply): I:8J On-site storm drain inlets 0 Interior floor drains and elevator shaft sump pumps 0 Interior parking garages I:8J Need for future indoor & structural pest control I:8J Landscape/Outdoor Pesticide Use 0 Pools, spas, ponds, decorative fountains, and other water features 0 Food service 0 Refuse areas 0 Industrial processes 0 Outdoor storage of equipment or materials 0 Vehicle and Equipment Cleaning 0 Vehicle/Equipment Repair and Maintenance 0 Fuel Dispensing Areas 0 Loading Docks I:8J Fire Sprinkler Test Water 0 Miscellaneous Drain or Wash Water I:8J Plazas, sidewalks, and parking lots Form I-3B Page 6 of9 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 Indicator bacteria Buena Vista Lagoon 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): Not Applicable to the Expected from the Also a Receiving Water Pollutant Project Site Project Site Pollutant of Concern Sediment D ~ ~ Nutrients D ~ ~ Heavy Metals ~ D D Organic Compounds ~ D D Trash & Debris D ~ D Oxygen Demanding Substances D ~ D Oil & Grease D ~ D Bacteria & Viruses D ~ ~ Pesticides D ~ D Form I-3B Page 7 of 9 Hydromodification Management Requirements Do hydromodification management requirements apply (see Section 1.6 of the BMP Design Manual)? 0 Yes, hydromodification management flow control structural BMPs required. 0 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. 1:8] 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. 0 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 I 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? DYes 1:8] 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? 0 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite 0 6.2.2 Downstream Systems Sensitivity to Coarse Sediment 0 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite 0 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 fmal result? 0 No critical coarse sediment yield areas to be protected based on verification of GLUs onsite 0 Critical coarse sediment yield areas exist but additional analysis has determined that protection is not required. Documentation attached in Attachment 8 of the SWQMP. 0 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 I Additional Information: Hydromodification requirements are not required for this project. Form I-3B Page 8 of9 Flow Control for Post-Project Runoff* *This Section only required ifhydromodification 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)? 0 No, the low flow threshold is 0.1Q2 (default low flow threshold) 0 Yes, the result is the low flow threshold is 0.1 Q2 0 Yes, the result is the low flow threshold is 0.3Q2 0 Yes, the result is the low flow threshold is O.SQ2 If a geomorphic assessment has been performed, provide title, date, and preparer: Discussion / Additional Information: (optional) Form I-3B Page 9 of9 Other Site Requirements and Constraints \X!hen 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 Form 1-4 for All Development Projects Carlsbad BMP Design (Standard Projects and Priority Development Projects) Manual (DRAFT) Project Identification Project Name: Yada Family Farm Subdivision Project ID: CT 15-11 Source Control BMPs All development projects must implement source control BJ\fPs SC-1 through SC-6 where applicable and feasible. See Chapter 4 and "-\.ppendix E of the Model BJ\fP 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 BJ\fP as described in Chapter 4 and/ or "-\.ppendix E of the Model BJ\fP Design Manual. Discussion / justification is not required . . "No" means the Bi\fP is applicable to the project but it is not feasible to implement. Discussion/ justification must be provided . • "N / N' means the BJ\fP is not applicable at the project site because the project does not include the feature that is addressed by the Bl\fP (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 [8J Yes I 0 No ID N/A Discussion / justification if SC-1 not implemented: SC-2 Storm Drain Stenciling or Signage [8J Yes I 0 :t-\o I D N/A Discussion / justification if SC-2 not implemented: SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, 0 Yes I 0 No I [8J N/"-\. Runoff, and Wind Dispersal 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-0 Yes I 0 No I [8J N/"-\. On, Runoff, and Wind Dispersal 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 0 Yes I 0 No I [8J N/A Dispersal Discussion / justification if SC-4 not implemented: No trash storage areas proposed. Form 1-4 Page 2 of2 Source Control Requirement Applied? SC-5 Additional BMPs Based on Potential Sources of Runoff Pollutants (must answer for each source listed below) [;8J On-site storm drain inlets [;8J Yes D No D N/A D Interior floor drains and elevator shaft sump pumps D Yes D No [;8J N/A D Interior parking garages D Yes D No [;8J N/A [;8J Need for future indoor & structural pest control [;8J Yes D No D N/A [;8J Landscape/Outdoor Pesticide Use [;8J Yes D No D N/A D Pools, spas, ponds, decorative fountains, and other water features D Yes D No [;8J N/A D Food service D Yes D No [;8J N/A D Refuse areas D Yes D No [;8J N/A D Industrial processes D Yes D No [;8J N/A D Outdoor storage of equipment or materials D Yes D No (;8JN/A D Vehicle and Equipment Cleaning D Yes D No [;8J N/A D Vehicle/Equipment Repair and Maintenance 0 Yes D No [;8J N/A D Fuel Dispensing Areas 0 Yes D No [;8J N/A D Loading Docks 0 Yes D No [;8J N/A [;8J Fire Sprinkler Test Water [;8J Yes D No D N/A D Miscellaneous Drain or Wash Water D Yes D No [;8J N/A [;8J Plazas, sidewalks, and parking lots [;8J Yes D No D 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 Form 1-5 for All Development Projects Carlsbad BMP Design (Standard Projects and Priority Development Projects) Manual [DRAFT) Project Identification Project Name: Yada Family Farm Subdivision Project ID: CT 15-11 Site Design BMPs All development projects must implement site design BI\IPs SD-1 through SD-8 where applicable and feasible. See Chapter 4 and Appendix E of the Model BI\IP Design Manual for information to implement site design Bl\IPs shown in this checklist. Answer each category below pursuant to the following . . "Yes" means the project will implement the site design Bl\IP as described in Chapter 4 and/ or "\ppendix E of the Model Bl\IP Design Manual. Discussion / justification is not required . . "No" means the BI\IP is applicable to the project but it is not feasible to implement. Discussion/ justification must be provided . . "N /N' means the Bl\IP is not applicable at the project site because the project does not include the feature that is addressed by the Bl\IP (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 0 Yes I 0 No I [gj N/A Discussion / justification if SD-1 not implemented: Site previously graded. SD-2 Conserve Natural Areas, Soils, and Vegetation 0 Yes I 0 No I [gj N/A Discussion / justification if SD-2 not implemented: SD-3 Minimize Impervious Area [gj Yes I 0 No I D N/.\ Discussion / justification if SD-3 not implemented: SD-4 Minimize Soil Compaction 0 Yes I 0 No I [gj N/A Discussion / justification if SD-4 not implemented: Site previously graded. SD-5 Impervious .\rea Dispersion [gj Yes l 0 No J D N/A Discussion / justification if SD-5 not implemented: Form 1-5 Page 2 of2 Site Design Requirement Applied? SD-6 Runoff Collection ~Yes I D No ID NIA Discussion I justification if SD-6 not implemented: SD-7 Landscaping with Native or Drought Tolerant Species ~Yes j D No I D NIA Discussion I justification if SD-7 not implemented: SD-8 Harvesting and Using Precipitation DYes I D No I~ NIA Discussion I justification if SD-8 not implemented: No rain-water harvesting strategies proposed. Summary of PDP Structural BMPs Form I-6 (PDPs) Project Identification Project Name: Yada Family Farm Subdivision Project ID: CT 15-11 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 ofBMPs 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 Bioftltration 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. Bioftltration basins were chosen as the structural BMP for DMAs draining to IMPs. The bioftltration basins have been sized based on the minimum BMP sizing factor of 3% for storm water pollutant control. See Attachment 1e for Worksheet B.S-1: Simple Sizing Methods for Bioftltration 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. \Vorksheet B.S-1 further demonstrates that the DCV can be achieved with bioftltration 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. Bioftltration basins (BF-1) will be used for pollutant control and peak flow control for the project stormwater runoff. The bioftltration basins will be conftgured 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 inftltration 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. Form 1-6 Page 2 of3 Structural BMP Summary Information (Copy this page as needed to provide information for each individual proposed structural BMP) Structural B?\IP ID No. Basin 1 Construction Plan Sheet No. Type of structural B?\IP: D Retention by harvest and use (HU-1) D Retention by infiltration basin (INF-1) D Retention by bioretention (INF-2) D Retention by permeable pavement (INF-3) D Partial retention by biofutration with partial retention (PR-1) IZ! Biofutration (BF-1) D Flow-thru treatment control with prior lawful approval to meet earlier PDP requirements (provide Bl'vfP type/ description in discussion section below) D Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofutration BJ\IP (provide B?\IP type/description and indicate which onsite retention or biofutration B?\IP it serves in discussion section below) D Flow-thru treatment control with alternative compliance (provide B?\IP type/ description in discussion section below) D Detention pond or vault for hydromodification management D Other (describe in discussion section below) Purpose: IZ! Pollutant control only D Hydromodification control only D Combined pollutant control and hydromodification control D Pre-treatment/forebay for another structural BJ\IP D Other (describe in discussion section below) Who will certify construction of this BMP? Provide name and contact information for the party responsible to sign B?\IP verification forms if required by the [City Engineer] (See Section 1.12 of the BJ\IP Design Manual) Who will be the final owner of this BMP? Who will maintain this BJ\IP into perpetuity? What is the funding mechanism for maintenance? City of Carlsbad Yada Family Trust Yada Family Trust Yada Family Trust Form 1-6 Page 3 of3 Structural BMP Summary Information (Copy this page as needed to provide information for each individual proposed structural BMP) Structural BJ\IP ID No. Basin 2 Construction Plan Sheet No. Type of structural BJ\IP: 0 Retention by harvest and use (HU-1) 0 Retention by infiltration basin (INF-1) 0 Retention by bioretention (INF-2) 0 Retention by permeable pavement (INF-3) 0 Partial retention by bioflitration with partial retention (PR-1) ~ Bioflitration (BF-1) 0 Flow-thru treatment control with prior lawful approval to meet earlier PDP requirements (provide BJ\IP type/description in discussion section below) 0 Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or bioflltration Bl\IP (provide BJ\IP type/ description and indicate which onsite retention or biofutration Bl\IP it serves in discussion section below) 0 Flow-thru treatment control with alternative compliance (provide BMP type/description in discussion section below) 0 Detention pond or vault for hydromodification management 0 Other (describe in discussion section below) Purpose: ~ Pollutant control only 0 Hydromodification control only 0 Combined pollutant control and hydromodification control 0 Pre-treatment/forebay for another structural BJ\IP 0 Other (describe in discussion section below) Who will certify construction of this BJ\IP? Provide name and contact information for the party responsible to sign BJ\IP verification forms if required by the [City Engineer] (See Section 1.12 of the BJ\IP Design Manual) Who will be the final owner of this BJ\IP? Who will maintain this Bl\IP into perpetuity? What is the funding mechanism for maintenance? City of Carlsbad Yada Family Trust Yada Family Trust Yada Family Trust ATTACHMENT 1 BACKUP FOR PDP POLLUTANT CONTROL BMPS Attachment Contents Checklist Sequence Attachment 1 a DMA Exhibit (Required) ./Included See DMA Exhibit Checklist on the back of this Attachment cover sheet. Attachment 1 b Tabular Summary ofDMAs Showing DMA Included on DMA Exhibit in ID matching DMA Exhibit, DMA Attachment 1a Area, and DMA Type (Required)* ./ Included as Attachment 1 b, separate from DMA Exhibit *Provide table in this Attachment OR on DMA Exhibit in Attachment 1a Attachment 1c Form 1-7, Harvest and Use Feasibility Included Screening Checklist (Required unless the ./Not included because the entire project entire project will use infiltration BMPs) will use infiltration BMPs Refer to Appendix B.3-1 of the BMP Design Manual to complete Form 1-7. Attachment 1 d Form 1-8, Categorization of Infiltration ./Included Feasibility Condition (Required unless the Not included because the entire project project will use harvest and use BMPs) will use harvest and use BMPs Refer to Appendices C and D of the BMP Design Manual to complete Form 1-8. Attachment 1 e Pollutant Control BMP Design Worksheets ./Included / Calculations (Required) Refer to Appendices B and E of the BMP Design Manual for structural pollutant control BMP design guidelines Attachment la DMAExhibit ,v .. : .,, '1' ' \ ~ ' ,. ' ::· j i -~j E ~· I ! ·1 :, : : ./! i ,~ jl : i "fC i : :: ' '.../ '' "" 'ii 9 BASIN 2 ,645 SF 8 -/,V':.::, ~~ ! .. ; ~-- --,f,_ --------, .' ,((-{, ' / ., .. 10 i ···---·i-< --~-- . \: ¥; YADA PLACE DMA 1 Y=EIE:':::::'LsL:::::::55=cP=u=s=L='c=>5e=='T-~:".55.s4o sF ' -- ! ' K:\Civil 3D\1289\PROD\Swmp\993~1289~SWMP rev 2.dwg, 4/6/201612:06:36 PM BASIN 1 1,125 SF 1 2 ·------------------------- / / ' / _;..--;., / : ---~ I ,.:~i~:~:i' ~;; . ,, "'"'"'--:.;_: ,::' ' ' /~ ,, : ! ' ' ' ------------------~------ ' " " i ' ' !. " ' . ~- 30' 15' IMP 1 2 . PROJECT CHARACTERISTICS SOIL TYPE B PROJECT AREA 4.57 ACRES DISTURBED AREA 3.79 ACRES PROPOSED IMPERVIOUS AREA 1.56 ACRES PROPOSED PERVIOUS AREA 2.23 ACRES LEGEND: BIOFIL TRA TION BASIN DMA BOUNDARY PROPERTY LINE DMA/AREA (SF) BIOFIL TRA TION BASIN ID SELF-RETAINING AREA DMA 1 9,505 SF BASIN 1 SR-1 AREA NOT FEASIBLE TO TREAT PROPOSED LANDSCAPE AREA (L) PROPOSED CONCRETE AREA (PCC) NF-1 LOWER OUTLET ORIFICE SEE RISER DIMENSIONS FOR IMPS TABLE, THIS SHEET IMPERMEABLE LINER ALONG VERTICAL WALLS AND BOTTOM OF BASIN PVC OUTLET\ PIPE \ ~oUTFLOW I 5.0' •ENGINEERED SOIL MIX SHALL PROVIDE A MINIMUM SUSTAINED INFILTRATION RATE OF 5"/HR. MIX SHALL BE SANDY LOAM TOP SOIL CONSISTING OF 50% SAND, 30% PLANTING SOIL, 20% SHREDDED HARDWOOD MULCH. 36"X36" BROOKS PCC CATCH BASIN W/ GRA TED INLET DEEP ROOTED, DENSE, DROUGHT TOLERANT PLANTING SUITABLE FOR WELL DRAINED SOIL RETAINING WALL 2-3" MULCH ~=f:===-:i.ta~· ENGINEERED SOIL MIX* 3" OF PEA GRAVEL ~10" DEPTH OF 3/4" CRUSHED ___l_ROCK FOR V2 STORAGE 6" PERFORATED PVC PIPE CONFORMING TO ASTM D 3034 OR EQUIVALENT PLACE PIPE WITH PERFORATIONS 3" ABOVE THE INVERT (BOTTOM OF GRAVEL LEA YER/ RESTRICTOR PLATE TO LIMIT FLOW FROM V2 STORAGE AREA, LID ORIFICE, {SEE IMP OIMENSIONS THIS SHEET} BIOFILTRATION BASIN TYP OUTLET DETAIL FROM HYDROLOGY REPORT NOT TO SCALE NOTE: SEE SWQMP FOR DCV CALCULATIONS AND MINIMUM BMP FOOTPRINT CALCULATIONS FOR POLLUTANT CONTROL 'IMP DIMENSIONS GRAVEL AREA GRAVEL DEPTH AMENDED SOIL UNDERDRAIN SURFACE DEPTH (SOFT) (IN) DEPTH (IN) ORIFICE D (IN) (RISER, TOP) (FT) 1,125 10 18 3 1.50, 5.00 1,645 10 18 4 1.50, 5.00 DMAEXHIBIT YADA FAMILY FARM SUBDIVISION bJ.iA,Inc. land planning, cMI engineering, suweylng 5115 AVENIDA ENCINAS 0' 30' 60' 120' SCALE: 1" = 30' SUITE "L" CARLSBAD, CA. 92008-4387 (760) 931-8700 Attachment tb Tabular Summary ofDMAs and Design Capture Volume Calculations DMA Surface Tabulation to Support Biof"dtration of Design Capture Volume DMAName- (DCV) Determination DMA1 DMA Impervious Area Tabulation Surface N arne Surface Type Area (ft2) R1 Conventional Roof Driveway and Patio 15,200 AC1 Asphalt Street 8,900 Total Impervious Area (ft2) 24,100 DMA Pervious Area Tabulation Surface N arne Surface Type 2 Area (ft ) L1 Landscape 52,640 Total Pervious Area (fl) 52,640 Total DMA (A) 55,840 Total Impervious Area (ft2) /Total DMA (ft2) =Percent Impervious 43% Soil Type D DMA Runoff Coefficient "C") 0.67 85th Percentile Rainfall (I) 0.6 Design Capture Volume (DVC) = (C)(I)(A) /12 1,874 DMA Surface Tabulation to Support Biof"dtration of Design Capture Volume DMAName- 1(DCV) Determination DMA2 DMA Impervious Area Tabulation Surface Name Surface Type Area (ft2) R2 Conventional Roof Driveway and Patio 30,400 AC2 Asphalt Street 8,730 Total Impervious Area (ft2) 39,130 DMA Pervious Area Tabulation Surface Name Surface Type 2 Area (ft) L2 Landscape 65,232 Total Pervious Area (ft2) 65,232 Total DMA (A) 95,632 Total Impervious Area (ft2) /Total DMA (ft2) =Percent Impervious 41% Soil Type D DMA Runoff Coefficient "C" 0.57 85th Percentile Rainfall (I) 0.6 Design Capture Volume (DVCl = (C)(I)(A) /12 2,739 Tabulation of Areas D .. to Self-Retainin.2 DMAs DMA Name -SR-1 Runoff Area x Runoff Surface Name Surface Type Area (ft2) Factor Factor PCC5 Conventional Concrete 1,956 1.0 1,956 Adjusted Surface Draining to Self-Retaining Area -_iA} 1,956 Receiving Self-Retaining Surface Area-_(B} 1,946 Self-Retaining Surface Area Type Landscape Ratio of (A) to (B) 1;1 Pond Depth withing Self-Retaining Area 0.5 in Total Area of DMA 3,902 Tabulation of Areas D .. to Self-Retaining DMAs DMA Name -SR-2 Runoff Area x Runoff Surface Name Surface Type Area (ft2) Factor Factor PCC6 Conventional Concrete 480 1.0 480 Adjusted Surface Draining to Self-Retaining Area -(A) 480 Receiv~ng_ Self-Retainin_g Surface Area -_(B} 462 Self-Retaining Surface Area Type Landscape Ratio of (A) to (B) 1;1 Pond Depth withing Self-Retaining Area 0.5 in Total Area of DMA 942 Tabulation of Areas D .. to Self-He . . DMAs DMA Name-SR-3 Runoff Area x Runoff Surface Name Surface Type Area (ft2) Factor Factor PCC7 Conventional Concrete 1,097 1.0 1,097 Adjusted Surface Draining to Self-Retaining Area-(A) 1,097 Receiving Self-Retaining Surface Area -_iB} 1,084 Self-Retainif!g_ Surface Area Type Landscape Ratio of (A) to _iB} 1;1 Pond Depth withing Self-Retainif!g Area 0.5 in Total Area of DMA 2,181 Tabulation of Areas Not Feasible to Treat DMA Name-NF-1 Surface Name Surface Type Area (ft2) PCC8 Conventional Concrete 233 L15 Landscape 46 Subtototal Areas Not Feasbile to Treat 279 Comment: 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-2 Surface Name Surface Type Area (ft2) AC3 Conventional Asphalt 1,592 L15 Landscape 126 Subtototal Areas Not Feasbile to Treat 1,718 Comment: 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. Tabulation of Areas Not Feasible to Treat DMA Name-NF-3 Surface N arne Surface Type Area (ft2) PCC6 Conventional Concrete 361 Subtototal Areas Not Feasbile to Treat 361 Comment: 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. Summary of DMA Treatment Practices 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 3.47 F1ow Through Planter IMPs 0 0 0 Inftltration IMP 0 0 0 Conventional Vegetated Swale 0 0 0 Extended _Q)_!Yl Detention Basins 0 0 0 Media (Sand) Filter 0 0 0 Wet Pond 0 0 0 Constructed Wetland 0 0 0 Proprietary Vault/Tree Well 0 0 0 Proprietary 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 Attachment 1c Form 1-7, Harvest and Use Feasibility Screening Checklist H d U F 'b'l' Ch kl' Form 1-7 arvest an se eas1 1 Ity ec 1st 1. Is there a demand for harvested water (check all that apply) at the project site that is reliably present during the wet season? [8J Toilet and urinal flushing [8J Landscape irrigation D Other: 2. If there is a demand; estimate the anticipated average wet season demand over a period of 36 hours. Guidance for planning level demand calculations for toilet/urinal flushing and landscape irrigation is provided in Section B.3.2. Modified E1WU = ETo\\ctX [(L(PF x HA)/IEJ + SLA] x 0.015 Using an average value for HA from the 14lots and Moderate Plant Water Use (per Table B.3-2); Modified E1WU = 2.7 x [[(0.5 x 13,160)/0.9] +OJ x 0.015 Modified E1WU = 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? 0 Yes I ~No ~ ~ Harvest and use appears to be feasible. Conduct more detailed evaluation and sizing calculations to confirm that DCV can be used at an adequate rate to meet drawdown criteria. 3b. Is the 36 hour demand greater than 0.25DCV but less than the full DCV? ~Yes I 0 No ~ ~ 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. Is harvest and use feasible based on further evaluation? 0 Yes, refer to Appendix E to select and size harvest and use BMPs. ~ No, select alternate BMPs 3c. Is the 36 hour demand less than 0.25DCV? 0 Yes ~ Harvest and use is considered to be infeasible. Attachment ld Form 1-8, Categorization of Infiltration Feasibility Condition Categorization of Infiltration Feasibility Condition Form 1-8 Part 1 -Full Inflltration Feasibili!;J:: Screening Criteria Would inftl.tration 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 Is the estimated reliable infiltration rate below proposed facility locations greater than 0.5 inches per hour? The response to this 1 Screening Question shall be based on a comprehensive evaluation of No the factors presented in Appendix C.2 and Appendix D. Provide basis: 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 2 mitigated to an acceptable level? The response to this Screening Yes No Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2. Provide basis: Form 1-8 Page 2 of 4 Criteria Screening Question Yes No 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 3 be mitigated to an acceptable level? The response to this Screening No Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. Provide basis: 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 4 contaminated groundwater to surface waters? The response to this No Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. Provide basis: If all answers to rows 1 - 4 are ''Yes" a full infiltration design is potentially feasible. The feasibility screening category is Full Infiltration Part 1 If any answer from row 1-4 is "No", infiltration may be possible to some extent Result but No * would not generally be feasible or desirable to achieve a "full infiltration" design. Proceed to Part 2 Attachment le Pollutant Control BMP Design Worksheets I Calculations Basin 1 Partial Retention Basin 2 Partial Retention ATTACHMENT 2 STRUCTURAL BMP MAINTENANCE INFORMATION Attachment Contents Checklist Sequence Attachment 2a Structural BMP Maintenance Thresholds ./Included and Actions (Required) See Structural BMP Maintenance Information Checklist on the back of this Attachment cover sheet. Attachment 2b Draft Maintenance Agreement (when ./Included applicable) 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: lnspector(s) Name: Address: Basin Location: DMA# __ Phone: Type of Inspection 0Monthly 0 pre-wet season 0Atter heavy runoff D End of wet season Oother: ( 1" or greater) Y=Yes N=No MR=Maintenance Required NA= Not Applicable Vegetation & Irrigation: §Vegetation is dead or diseased Vegetation & Irrigation systems in good condition Overgrown 0Neat and orderly in appearance Required Maintenance: Soil: 0Too deep or too shallow (the distance from the top of mulch to the top of riser pipe shall be 4") Required Maintenance: Pag_e1of 3 Mulch: §Missing or Patchy in Appearance Depth of mulch layer less than 3-in Areas of Bare earth Required Maintenance: --------------------------------------------- Sediment, Trash & Debris: 0Accumulated sediment, trash,and debris present 0Drain time exceeds 4 hours Required Maintenance: __________________________________________ ___ Clogs: §Soil too deep or too shallow accumulated sediment, trash and debris Drain time more than 5 days after rainfall Required Maintenance: Structural Components: --------------------------------------------- Flow to basin is impeded inflow pipes or downspouts are cloged/damaged damaged splash/rock blocks Over flow pipe in damaged or cloged Underdrain pipes cloged or damaged Planter is cracked, leaking or falling apart Pa e 2 of 3 Required Maintenance: --------------------------------------------- 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 Control Program 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 ins ection u on re uest at an time. Pa e 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) bioftltration basins for storm water treatment and detention. The bioftltration 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 1 ") and once during the early dry season (April 30'h). The inspection and maintenance training program consists of the operation and function of the bioftltration basins. Please refer to the sections VI and VII for fact sheets and checklists. It is the responsibility ofYada 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 Sheriffs 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" 1n height, make the appropriate note/ comment on the maintenance inspection form. VI. Summary of Drainage Areas and Storm water 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 Bioflitration 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. Bioflltration 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, Y ada Place. Y ada Place will intersect Valley Street, and run easterly through the center of the project. Y ada 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 bioflltration 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 bioflltration 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 bioflltration 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 Y ada 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 1 a for calculations for Areas Draining to Self- Retaining DMAs. The proposed bioftltration 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 bioftltration 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 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 0 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." Results of Inspection: Date Maintenance Completed and Date Work needed? Description of Maintenance Conducted What To Look For? Inspected (Yes/No) 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: Signature of Responsible Party County of San Diego Watershed Protection Program Treatment Control BMP Tracking 5201 Ruffin Road, Suite P, MS 0326 San Diego, CA 92123 OR Email: Watersheds@sdcounty.ca.gov Print Name Date 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, ifyou have a manufactured structure, please refer to the manufacturer's maintenance instructions. Biofilters include the following : D Vegetated Filter Strip/Swale D Bioswale D Bioretention Facility D Planter Boxes D 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 Remove and properly dispose of accumulated materials, covers vegetation), litter, or debris 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 Mow or trim as appropriate, but not less than the design of design is present and grass excessively tall height of the vegetation (typically 4-6 inches for grass). (greater than 10 inches) 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 Where there is an underdrain, such as in planter boxes larvae are present and persistent, contact the San and manufactured biofilters, check the underdrain piping Diego County Vector Control Program at (858) 694-to make sure it is intact and unobstructed. Abate any 2888. Mosquito larvicides should be applied only potential vectors by filling holes in the ground in and when absolutely necessary and then only by a around the biofilter facility and by insuring that there are licensed individual or contractor. 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, Repair or replace as applicable. inlet, or outlet structures Before the wet season and after rain events: remove Where cisterns are part of the system 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. For manufactured high-flow-rate biofilters, see manufacturer's maintenance guidelines - .. • .. --.. .. - ,.,. --- - Fact Sheet ~ BIORETENTION FACILITIES These facilities remove pollutants primarily by ftltering 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 ftltering 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 thheight 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 \ ' • - : : . - ~ i i I ' :! i / I ' II II 9 ----- I \ 8 --l "' -I- I --l ( 3 I I ;( ,Z "t -'J'' Jli:it~rrt-~rli .. i, / I ~ ', J I .;::: >--'--11' :>";; -'"I , ~ I ~ I II II . I ~---'-~+gs) '--w"" ~ K:\Civii3D\1289\PROD\Swmp\993-1289-POST CONST BMP EXHIBIT.dwg, 4/5/2016 9:16:14 AM ' ' ' ' ' ' ' 2+00 YADAPLACE 1 20 10 SINGLE SHEET BMP SITE PLAN YADA FAMILY FARM SUBDWISION, CITY OF CARLSBAD SD ---:--- -'-[ -j ' ' ' • • ~ • • ' ' 7 ' ' . C) ' ' • :I I I I I 1 23 I : . I: 1- -I --------------------~ J- 5 1 ~ 2( I --L /" L I r ---I( , I • ~~ '11 I --I - "-· f I I ' ~- 1 I I ---\ r-- 1 I I ' .I il .I ------- -.-.- 25 . ' • • • / I I -~ /' I -~ ,; !j < ..-/I 3 I ~ ~' I 1 ~ ~' ----:r: --* 0~~~20 4~0 ~~~60 SCALE: 1" = 20' I I I I /I -i -!/! . :-<( ' Vi': //I . . I ; ·0 0 , r -..:y I I -~ //'-' _: I i ; , I /~ /': ' I I ~~ -~ " j/ I ! ' I ' ' f ! / 'S'";v~f "I' ,'-": .. : '-..,.'.:,...J-·-:::::::.;~· -----------{ ---' --~''· SWMP NO. ----'-1.::....5""'""'11'------ PARTY RESPONSIBLE FOR MAINTENANCE: J:=:=-::t:~~=~~~==j~====~~==-=:~::--" :~::=:=:=~t-,'~(0,, NAME JIM YADA ADDRESS 1835 Buena Viirta Way Carlsbad Ga 92008 BMP NOTES: 1. THESE BMPS ARE MANDATORY TO BE INSTALLED PER MANUFACTURER'S RECOMMENDATIONS OR THESE PLANS. i 'i , I i : ! I :.:'---:=1 ==·-]' r===r=~ . I I I . I I ! ! (S) ---\---(S) ~~ CS) --CSl ---J bl-tA,Inc. kind planning, cMi englneeilng, surveying 5115 A VENIDA ENCINAS SUITE "L" CARLSBAD, CA. 92008-4387 (760) 931-8700 DATE INITIAL ENGINEER OF WORK ,\ -. " : . ; J j ' : i ' ' ' ' CONTACT ,_J100M-'-YA!:!!D£A,__._ __ _ PHONE NO. 949-892-0125 PLAN PREPARED BY: ~~~ SIGNATURE NAME Bruce Rice COMPANY 12BHDLA:l..Win"-c --,------ ADDRESS 5115 Avenida Encinitas. Suite L Carlsbad Ca 92008 PHONE NO. 760-931-8700 CERTIFICAT 2. NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. 3. NO SUBSTITUTIONS TO THE MATERIAL OR TYPES OR PLANTING TYPES WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. 4. NO OCCUPANCY WILL BE GRANTED UNTIL THE CITY INSPECTION STAFF HAS INSPECTED THIS PROJECT FOR APPROPRIATE BMP CONSTRUCTION AND INSTALLATION. 5. REFER TO MAINTENANCE AGREEMENT DOCUMENT. 6. SEE PROJECT SWMP FOR ADDITIONAL INFORMATION. BMP TABLE BMPID# BMPTYPE SYMBOL TREATMENT CONTROL 0 BIOFILTRATION AREA BIOFILTRATION AREA + + + + + + + + + + + + + + + + + + + + + + LOW IMPACT DESIGN (LI.D.) 1'0\ ~ ROOF DRAIN TO • \:::1-~ LANDSCAPING SOURCE CONTROL CASQA NO. TC-32 TC-32 SD-11 ® STENCILS NO DUMPING SD-13 RAINS TO OCEAN QUANTITY ~SF. 24EA. 1 EA. * CHOOSE FROM THE LIST BELOW FOR COMPLETING THE FIELDS IN THE INSPECTIONS & MAINTENANCE FRENQUENCY COLUMNS: ANNUAL SEMI-ANNUALLY QUARTERLY BIMONTHLY MONTHLY AS NEEDED NONE WEEKLY 1 TIME PER YEAR 2 TIMES PER YEAR 3 TIMES PER YEAR - 4 TIMES PER YEAR DRAWING NO. SHEET NO.(S) 583-5A 3 583-5A 3 583-5A 3 INSPECTION * FREQUENCY QUARTERLY QUARTERLY ANNUALLY CITY OF CARLSBAD ENGINEERING DEPARTMENT MAINTENANCE * FREQUENCY SEMI-ANNUALLY SEMI-ANNUALLY ANNUALLY SINGLE SHEET BMP SITE PLAN YADA FAMILY FARM SUBDIVISION RECORD COPY PROJECT NO. CT15-11 DATE INITIAL DATE INITIAL DRAWING NO. REVISION DESCRIPTION OTHER APPROVAL Cll'Y APPROVAL INI11AL DATE Figures Soil Type Exhibit HYDRO UNIT NAME CARLSBAD HYDRO AREA NAME Buena Vista Creek El Saito 904.21 HYDRO SOIL GROUP B O<:eanside Basin Geotechnical Study