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Home My WebLink AboutPA2022-042_20220127_WQMPWQ County of Orange/Santa Ana Region Priority Project Water Quality Management Plan (WQMP) Project Name: Chen's Residence GRADING PERMIT NO. 0411-2021, ADDRESS: 1424 GALAXY DR. NEWPORT BEACH, LOT 78 OF TRACT NO. 4224, AND APN. 117-671-14 Prepared for: Eddie Chen 1424 Galaxy Dr. Newport Beach, CA 92660 Phone: 949-584-9594 Prepared by: JT Consulting Engineers 11251 Gardenaire Lane Garden Grove, CA 92841 1-714-815-2356 / jdtran07@gmail.com Date Prepared: 1-27-2022 Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Owner’s Certification North OC Priority WQMP Template August 17 2011 Page i This Water Quality Management Plan (WQMP) has been prepared for Eddie Chen by JT Consulting Engineers. The WQMP is intended to comply with the requirements of the County of Orange NPDES Stormwater Program requiring the preparation of the plan. The undersigned, while it owns the subject property, is responsible for the implementation of the provisions of this plan , including the ongoing operation and maintenance of all best management practices (BMPs), and will ensure that this plan is amended as appropriate to reflect up-to-date conditions on the site consistent with the current Orange County Drainage Area Management Plan (DAMP) and the intent of the non-point source NPDES Permit for Waste Discharge Requirements for the County of Orange, Orange County Flood Control District and the incorporated Cities of Orange County within the Santa Ana Region. Once the undersigned transfers its interest in the property, its successors-in-interest shall bear the aforementioned responsibility to implement and amend the WQMP. An appropriate number of approved and signed copies of this document shall be available on the subject site in perpetuity. Owner: Eddie Chen Title Company Address 1424 Galaxy Dr. Email Telephone # 949-584-9594 I understand my responsibility to implement the provisions of this WQMP including the ongoing operation and maintenance of the best management practices (BMPs) described herein. Owner Signature Date Project Owner’s Certification Planning Application No. (If applicable) N/A Grading Permit No. 0411‐2021 Tract/Parcel Map and Lot(s) No. Lot 78 of Tract No. 4224 Building Permit No. Address of Project Site and APN (If no address, specify Tract/Parcel Map and Lot Numbers) 1424 Galaxy Dr., APN 117‐671‐14 Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Owner’s Certification North OC Priority WQMP Template August 17 2011 Page ii Preparer (Engineer): John Tran Title Principal PE Registration # C-62653 Company JT Consulting Engineers Address 11251 Gardenaire Lane, Garden Grove, CA 92841 Email jdtran07@gmail.com Telephone # 714-815-2356 I hereby certify that this Water Quality Management Plan is in compliance with, and meets the requirements set forth in, Order No. R8-2009-0030/NPDES No. CAS618030, of the Santa Ana Regional Water Quality Control Board. Preparer Signature Date 1-27-2022 Place Stamp Here Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Table of Contents North OC Priority WQMP Template August 17 2011 Page iii Contents Page No. Section I Permit(s) and Water Quality Conditions of Approval or Issuance .......... 1 Section II Project Description .................................................................................. 3 Section III Site Description ........................................................................................ 8 Section IV Best Management Practices (BMPs) ........................................................ 9 Section V Inspection/Maintenance Responsibility for BMPs ................................. 28 Section VI BMP Exhibit (Site Plan) .......................................................................... 29 Section VII Educational Materials ............................................................................. 30 Attachments Attachment A . .................................................................................. Educational Materials Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section I North OC Priority WQMP Template August 17 2011 Page 1 Section I Permit(s) and Water Quality Conditions of Approval or Issuance Project Infomation Permit/Application No. (If applicable) N/A Grading or Building Permit No. (If applicable) - Address of Project Site (or Tract Map and Lot Number if no address) and APN 1424 Galaxy Dr., Newport Beach APN: 117-671-14 Water Quality Conditions of Approval or Issuance Water Quality Conditions of Approval or Issuance applied to this project. (Please list verbatim.) The project site is in the Newport Coastal Streams Watersheds and the water quality is currently listed by the State of California (Approved 2010 303(d) listed Water Bodies & Associated POC) as impaired by the pollutant of Indicator Bacteria. Conceptual WQMP Was a Conceptual Water Quality Management Plan previously approved for this project? No Watershed-Based Plan Conditions Provide applicable conditions from watershed - based plans including WIHMPs and TMDLS. The Newport Coastal Streams Watershed covers 7.77 square miles, chiefly in the unincorporated area between the Newport Beach and Laguna Beach. Newport Coast and Muddy Creek, its main tributaries, drain the San Joaquin Hills. There are two receiving water bodies, Morning Canyon Creek & Buck Gully Creek, in this watershed. However, the Pacific Ocean is the downstream receiving water body from the project site (see attached MS4 Map), which is not potentially susceptible to hydromodification impacts. 0 7 05E . F 1 9 F 1 9 F20 S A N F 1 8 F20G04 F05F22F23 F04F 2 1F25 F 18 F05 F 2 7 F 1 0 F16F03 F 2 6 F14 F17F11F06 F07 F 1 5F01F 0 2 F05 F24F12G 00 P 0 7MESA CHNLAGUAC H A N N EL C Y N.CHNLCHNL.F08P20F08P02C H N L .CREEKCREEKCHNL.SANTACHNL.NORTHF23P15F08P01 F08P09 F 0 9 P 1 0 F 0 9 P 0 5 CANYONG0 2 P0 2 F07B01F23P12F 2 3 P 0 1 G04P01 G0 0 P01BOMMER F14P01 CHINON F23 P 1 1 G04P02 F23P16 F20P04BONITAF23S02G04P03 F19P07 G02P01F 2 3 P 02 F 1 9 P 1 3 F 2 1 P 0 2 G03P01F 2 0 P 0 7 F07S05 F13P02 F19P01 G 0 3 P0 2 F25S05F08P07F19P11F07S01F 1 9 P 1 2 F 1 9 P 0 3 F 2 3 P 0 5 F23P09CANADA F19P02F19P05F14P11 F24P02F15P03F01S03F07P14F23P07G03P03 G 0 0 D 0 2F01P10 F05P19F19P04F06B01F 1 5 P 0 1F15P11F08P08F 0 8 P 1 0 F07P01 F10P07F07P08F07P07F27P05F 0 1 S 0 1 F07P06F27P01 F14P02 F 2 3 P 0 3 F 2 5 B0 1 F 0 5 P 1 8TUSTINF0 6 S02F27P02F14S01 F 0 7 P2 3 F26P02F26P01F03P02F07P19 F27P04 CANYON F 0 6 P 0 3F06P05F12P03F12P04 F05S03F12P02F27P03 F05P04F05P27MODENAF0 6 P0 2F07P28F12P11 F06P07F14P04 F 0 6 P0 8 F16P01F0 7 P0 4 F13P05F13P06F10S02SERRANOBORREGO C H A N N E LCHANNELJ O A Q U IN CHNL.GARDENSF07S1P12- IRVINEMARSHBURNSA N T A A NA S A N DIEG O PAULARINO ANA-DELHIRATTLESNAKESANTA ISABELCE NTRAL I RVI NEFPF07P12EL F19G03G02BEEF13F09F08ANACHNLCOMOC H N L C H N L LANE CHNL.CHNLSAND CHNL CHNLF09P15F09P02F08P17F09P01C H N L .C HNL. R O U N D HICKS CHNL. S T O R MCOSTASANTAC H N L. F 0 8 P 1 5 F09P03F 0 9 P 0 6 F 0 9 P 0 4 F 0 9 P 0 8F08P13 C Y N .F23P14 F 1 9 P 0 6 F 2 3 P 0 4 F 23D0 1F10S01CANYONPETERSF25P02F10P02F06P04F 0 6 S0 3F10P01 F13P01F25P01F10P03F13P03S A NT A F ES. WEST TUSTIN CHNL.CANYONCYN. CANYON CHANNELCHANNELCHAN N E L F18Aliso CreekAliso Creek AnaheimAnaheim Bay-HuntingtonBay-Huntington HarbourHarbour Laguna Coastal StreamsLaguna Coastal Streams Newport BayNewport Bay NewportNewport CoastalCoastal StreamsStreams San Juan CreekSan Juan Creek Santa Ana RiverSanta Ana River SANTA ANA ORANGE ANAHEIM TUSTIN MISSION VIEJO GARDEN GROVE NEWPORT BEACH COSTA MESA LAKE FOREST FOUNTAIN VALLEY LAGUNA BEACH VILLA PARK UNINCORPORATED UNINC. UNINC. ALISO VIEJO UNINC.UNINC. UNINCORPORATED IRVINE LAGUNA WOODS UNINCORPORATED LAGUNA HILLS ANAHEIM 1ST ST ROC K FI E L D B L V DCIVIC CENTER DR NEWPORT BLVDWASHINGTON AV ANTON BLV D FAIRVIEW RDEDINGER AV 19TH ST MEADOWOOD YA L E AVSANTA CLARA AV HARBOR BLVDRED HILL AVWARNER AV LE VANTOCANYON V IEW AV BEAR STIRVINE AV4TH ST A D A M S AV SUNFLOWER AV MACARTHUR BLVD 2 8 T H S TSUPE RIOR AVCULVER DRBAKE PKWYBALBOA BLVD SY C A M O R E A VFLOWER STC A M P U S D R BISON AV SA N JO A Q U I N HIL L S R D LAKE FOREST DRJEFFREY RDDYER RD NO RTH W O ODCHESTNUT AV FAIRHAVEN AV BIRCH STMUI RL A N DS B L V D VIA LID OYORBA STP O R TO LA PKWYNEWPORT AV17TH ST MCFADDEN AV TU S T I N RANC H R D 5TH ST W ALN U T A V SEGERSTROM AV STANDARD AVS A N T A A N A BLVD BROW NING AVHEWES STMABURY ST17TH RD17TH ST BA YSIDE DR ALTO N AV ALTON P K WY FAIR DR IR VIN E BLV D COAST HWY WESTW O OD MICHEL S O N D R IRVINE BLVDLINCOLN AVBAKER ST BROADWAY15TH ST NEWPORT B LVDW EST CLIFF D R ORCHARD PARK PAULARINO AV BARRA N C A PK W Y EASTWOODBAKER AV 16TH ST AVOCADO AVCARLSON AVSAN T A M A R IA AV RIDGE ROUTE DR EL C AMIN O R E A L B RYAN AV T OL E DO W YVON KARMAN AVSAND CANYON AVR A N C HO PKWYTUSTIN AVMARGUER IT E AVFORD RD U N IVERSITY DR JAMBOREE BLVDARLINGTON DR A L T O N P K W Y LA G U N A R D MACARTHUR BLVDT R A B U C O R D LAGUNA CANYON RDB O N I TA CANYON DR MY F OR D R D QUAIL HI L L PKWYCREEK RDLAKE RDT E C HNOL O G Y DRMERRIMAC WY JAMBOREE RDBRISTOL STPLACENTIA AVIR VI N E CENTER DRHARVARD AVGRAND AVD O VER DRMAIN STRAITT STSOUT H W O O D TURTLE ROCK D R HEWES AVJERONIMO RDS A N M IGUEL DREAST Y ALE LOOPRI DGE L I NE DREASTBLUFF DR JAMBOREE RDW ES T YALE LOOP A VENI D A D E L A C A RLOT ANEWP O R T COAST DRDana Point Coastal Streams Laguna Coastal Streams Newport Bay San Clemente Coastal Streams San Juan Creek San Mateo Creek Santa Ana River Area of Interest Newport Coastal Streams Aliso Creek San Gabriel - Coyote Creek Anaheim Bay - Huntington Harbour 0 5,000 10,000 15,000 20,0002,500 Feet ± 97294 Acres WATERSHED: NEWPORT BAY COUNTY OF ORANGE, CALIFORNIA DATE: The County of Orange and Geomatics/LIS/GIS make no representations or warranties regarding the accuracy of the data from which this map was derived. Neither the County nor Geomatics/LIS/GIS shall be liable under any circumstances for any direct, indirect, special, incidental or consequential damages with respect to any claim by any user or any third party on account of or arising from the use of this map. DESIGNED AND PRODUCED BY: OC Public Works GIS Mapping Unit Philip Pappas DATA SOURCE: - Geomatics Land Information Systems Division November 18, 2009 F:\PROJECTS\Phil\Watersheds\Watersheds.mxd LAND USE Agricultural Commercial Industrial Public Residential No Available Data Vacant ACRES 6262 10030 5257 16599 27009 15749 729 Acres 27,000 24,000 21,000 18,000 15,000 12,000 9,000 6,000 3,000 0 VacantAgriculturalCommercialIndustrialPublicResidentialNo Available DataLAND USE Agricultural Commercial Industrial Public Residential No Available Data City / County Jurisdiction Major Streets Minor Streets Vacant Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section II North OC Priority WQMP Template August 17 2011 Page 2 Section II Project Description II.1 Project Description Description of Proposed Project Development Category (From Model WQMP, Table 7.11-2; or -3): This is a Priority project. Project Area (ft2): 9115 Number of Dwelling Units: 1 SIC Code: 1521 Project Area Pervious Impervious Area (acres or sq ft) Percentage Area (acres or sq ft) Percentage Pre-Project Conditions 4276 s.f. 46.9% 4839 s.f. 53.1% Post-Project Conditions 2252 s.f. 24.7% 6863 s.f. 75.3% Drainage Patterns/Connections The existing on-site drainage patterns were listed as follows: The runoff over the existing driveway and sideyards drained as sheet flow toward Galaxy Drive. The entire area of rooftop runoff are collected and drained by area drains via the existing piping to curb drain at Galaxy Dr. Narrative Project Description: (Use as much space as necessary.) This project is a remodel and additions. The proposed configuration of the site contains the following: A single dwelling unit with the garage facing the Galaxy; A swimming pool in the rear of the house; The lot consists of a first floor, which is elevated at 2.5 feet above the flow line of Signal Road. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section II North OC Priority WQMP Template August 17 2011 Page 3 II.2 Potential Stormwater Pollutants Pollutants of Concern Pollutant Check One for each: E=Expected to be of concern N=Not Expected to be of concern Additional Information and Comments Suspended-Solid/ Sediment E N The receiving water body is Pacific Ocean Nutrients E N The receiving water body is Pacific Ocean Heavy Metals E N Pathogens (Bacteria/Virus) E N The receiving water body is Pacific Ocean Pesticides E N The receiving water body is Pacific Ocean Oil and Grease E N The receiving water body is Pacific Ocean Toxic Organic Compounds E N The receiving water body is Pacific Ocean. Trash and Debris E N The receiving water body is Pacific Ocean Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section II North OC Priority WQMP Template August 17 2011 Page 4 II.3 Hydrologic Conditions of Concern Determine if streams located downstream from the project area are potentially susceptible to hydromodification impacts. No – Show map Yes – Describe applicable hydrologic conditions of concern below. The runoff from the site will be transported, via street curb & gutter, to the curbside inlet along Galaxy Drive and discharged to the Pacific Ocean via the existing storm drain. In other words, the runoff was directly discharged into the Pacific Ocean and no streams located downstream from the project area are potentially susceptible to hydromodification impacts. II.4 Post Development Drainage Characteristics Describe post development drainage characteristics. The post‐development on‐site runoff will be collected and transported, via proposed piping systems, to the bioretention and overflow to curb drains on the Galaxy Drive. The runoff leaving the site will be drained, via the street curb & gutter, and collected by catch basin at Galaxy Drive before discharging into the receiving water body "Pacific Ocean" directly. II.5 Property Ownership/Management Describe property ownership/management. P:\9526E\6-GIS\Mxds\Reports\InfiltrationFeasability_20110215\9526E_FigureXVI-3d_NewportBaySusceptibility_20100430.mxdSanta Ana River Watershed Santa Ana River Watershed South Orange County Anaheim Bay- Huntington Harbor Watershed JohnWayneAirport LOWER PETERSCANYON RETARDINGBASIN HICKS CANYONRETARDINGBASIN SIPHONRESERVOIR ROUND CANYONRETARDINGBASIN BEE CANYONRETARDINGBASIN EASTFOOTRETARDINGBASIN ORCHARD ESTATESRETENTION BASIN AGUA CHINONRETARDINGBASIN VILLAGEPOND PARK SAND CANYONRESERVOIR SAN JOAQUINRESERVOIR LAGUNARESERVOIR BIG CANYONRESERVOIR BONITACANYONRESERVOIR BASINNUMBER 1 NORTHLAKE SOUTHLAKEBASINNUMBER 2 EL MODENA-IRVINERETARDING BASIN HARBORVIEW DAM EAST HICKSCANYONRETARDING BASIN RATTLESNAKERESERVOIR TRABUCORETARDINGBASIN MARSHBURNRETARDINGBASIN FIGURE XVI-3dJOBTITLESCALE1" = 4000'DESIGNEDDRAWINGCHECKEDBMP04/30/10DATEJOB NO.9526-ETHTHORANGE COUNTYWATERSHEDMASTER PLANNINGORANGE CO.CASUSCEPTIBILITY ANALYISNEWPORT BAY-NEWPORT COASTAL STREAMS!I 0 8,000 16,0004,000 Feet Susceptibility Potential Areas of Erosion, Habitat, & Physical Structure Susceptibility Channel Type Earth (Unstable) Earth (Stabilized) Stabilized Tidel Influence <= Mean High Water Line (4.28') Water Body Basin Dam Lake Reservoir Other Lands Airport/Military PRELIMINARY MAPSUBJECT TO FURTHER REVISION Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section II North OC Priority WQMP Template August 17 2011 Page 5 Eddie Chen is the property owner of this development and will be responsible for the maintenance of all on-site stormwater facilities during his ownership. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section III North OC Priority WQMP Template August 17 2011 Page 6 Section III Site Description III.1 Physical Setting Fill out table with relevant information. Name of Planned Community/Planning Area (if applicable) Cliff Haven Community Association Location/Address 1424 Galaxy Drive Newport Beach, CA 92660 General Plan Land Use Designation RS-D Zoning R-1 Acreage of Project Site 0.209 Acres Predominant Soil Type Hydrologic Soil Group (HSG) D Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section III North OC Priority WQMP Template August 17 2011 Page 7 III.2 Site Characteristics Site Characteristics Precipitation Zone Design Capture Storm Depth (Inches) : 0.70 Topography The existing building area, including planters & walkways, is at a descending slope of about 2% toward Galaxy Drive.. Drainage Patterns/Connections The on-site drainage was drained as sheet flow toward area drains via sub drain piping system to the front of the site and transported off the site. Soil Type, Geology, and Infiltration Properties The on-site soil is HSG D, with limited infiltration capacity. The lot topography generally consists of a level graded building pad. The back of the building pad descends approximately 3.5 feet, over distances of about 10 to 15 feet, to the top of an existing retaining wall at the northeast property line. The exposed height of the retaining wall varies from approximately 4 to 10 feet along the rear (northeast side) of the lot. Immediately beyond the northeast property line is an approximate 100-foot bluff slope which descends to the Newport Back Bay along the east property boundary. The overall bluff slope gradient varies from approximately 1:1 to 1.5:1 (horizontal:vertical). Our findings indicate that the back yard is underlain by wall backfill, landslide repair fill, concrete and steel tiebacks and possibly fill soil placed as part of the former lot development. The locations of the buried tiebacks were not determined as part of our investigation. Hydrogeologic (Groundwater) Conditions Groundwater was not observed in the exploratory borings at the time of the investigation. Although not encountered in the borings, groundwater may develop along the contact between permeable terrace deposits and the less permeable underlying bedrock or silt layers within the deposits as a result of rainfall, irrigation and seepage from uphill properties. Groundwater seepage is not anticipated to be a significant design or construction constraint, provided proper surface drainage and subdrainage systems are incorporated into the project; however, the presence of groundwater in deeper caisson borings during construction is possible and may promote caving in caisson excavations. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section III North OC Priority WQMP Template August 17 2011 Page 8 Geotechnical Conditions (relevant to infiltration) On-site water infiltration is not recommended due to potential for future seepage and perched water in basement. Surface and subsurface drainage should be directed toward approved outlets. Off-Site Drainage No obvious evidence of erosive discharge onto or from the site was noted. Utility and Infrastructure Information Not any underground utilities and/or infratures exist on site. III.3 Watershed Description Receiving Waters Newport Coastal Streams 303(d) Listed Impairments DDT (Dichlorodiphenyltrichloroethane), Dieldrin , and PCBs Applicable TMDLs Not available until 2019 Pollutants of Concern for the Project Pathogens , Oil & Grease, metal copper Environmentally Sensitive and Special Biological Significant Areas N/A Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 9 Section IV Best Management Practices (BMPs) IV. 1 Project Performance Criteria (NOC Permit Area only) Is there an approved WIHMP or equivalent for the project area that includes more stringent LID feasibility criteria or if there are opportunities identified for implementing LID on regional or sub-regional basis? YES NO If yes, describe WIHMP feasibility criteria or regional/sub-regional LID opportunities. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 10 Project Performance Criteria If HCOC exists, list applicable hydromodification control performance criteria (Section 7.II-2.4.2.2 in MWQMP) Since HCOC does not exist so hydromodification will not be considered. List applicable LID performance criteria (Section 7.II-2.4.3 from MWQMP) Priority projects must infiltrate, harvest and re- use, evapotranspire, or bio/biofilter the 85th percentile, 24-hour storm event (design capture volume). List applicable treatment control BMP performance criteria (Section 7.II-3.2.2 from MWQMP) Calculate LID design storm capture volume for Project. Volume-based BMP = 322 CF for DMA 1 (6863 s.f.) Lot = 9115 s.f. Impervious = 6863/9115= 0.753 C=0.75*0.753+0.15=0.715 DCV=0.715*0.7/12*9115= 380 CF DMA1: DCV1 = 380 CF Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 11 IV.2. Site Design and Drainage Volume-based BMPs Sizing: The runoff of DMA1, which include rooftops and hardscape, will be collected by the multiple area drains via pipe, conveying runoff to infiltration trenches. The runoff over the rear landscaping area DMA2, undisturbed area, will be drained on existing natural process percolation/infiltration. Attached are DMAs and associated DCV to be mitigated by the proposed BMPs: Description of Drainage Management Area (DMA) Area (S.F.) Design Capture Volume (DCV) Proposed BMPs Discharge Locations Rooftops and Hardscape (DMA1) 6863 380 CF Bioretention with underdrain On site DMA1: Impervious = 6863/9115= 0.753 C=0.75*0.753+0.15=0.715 DCV=0.715*0.7/12*9115= 380 CF DMA1: DCV1 = 380 CF GIS BMP COORDINATE: 33.628584434316984, -117.89089167250589 IV.3 LID BMP Selection and Project Conformance Analysis Each sub-section below documents that the proposed design features conform to the applicable project performance criteria via check boxes, tables, calculations, narratives, and/or references to worksheets. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 12 IV.3.1 Hydrologic Source Controls (HSCs) If required HSCs are included, fill out applicable check box forms. If the retention criteria are otherwise met with other LID BMPs, include a statement indicating HSCs not required. Name Included? Localized on-lot infiltration Impervious area dispersion (e.g. roof top disconnection) Street trees (canopy interception) Residential rain barrels (not actively managed) Green roofs/Brown roofs Blue roofs Impervious area reduction (e.g. permeable pavers, site design) Other: vegated slope (undisturbed) on-lot infiltration Other: Other: Other: Other: Other: Other: Other: Worksheet I: Summary of Groundwater‐related Feasibility Criteria 1 Is project large or small? (as defined by Table VIII.2) circle one Large Small 2 What is the tributary area to the BMP? A 0.209 acres 3 What type of BMP is proposed? bioretention 4 What is the infiltrating surface area of the proposed BMP? ABMP 70 sq-ft Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 13 Worksheet I: Summary of Groundwater‐related Feasibility Criteria 5 What land use activities are present in the tributary area (list all) single family dwelling 6 What land use-based risk category is applicable? L M H 7 If M or H, what pretreatment and source isolation BMPs have been considered and are proposed (describe all): 8 What minimum separation to mounded seasonally high groundwater applies to the proposed BMP? See Section VIII.2 (circle one) 5 ft 10 ft 9 Provide rationale for selection of applicable minimum separation to seasonally high mounded groundwater: Per soil report, ground water table is very low. 10 What is separation from the infiltrating surface to seasonally high groundwater? SHGWT 25 ft 11 What is separation from the infiltrating surface to mounded seasonally high groundwater? Mounded SHGWT 15 ft 12 Describe assumptions and methods used for mounding analysis: Assumptions and metods are based on Orange County Infiltration Study, Map XVI-2D. 13 Is the site within a plume protection boundary (See Figure VIII.2)? Y N N/A 14 Is the site within a selenium source area or other natural plume area (See Figure VIII.2)? Y N N/A 15 Is the site within 250 feet of a contaminated site? Y N N/A Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 14 Worksheet I: Summary of Groundwater‐related Feasibility Criteria 16 If site-specific study has been prepared, provide citation and briefly summarize relevant findings: 17 Is the site within 100 feet of a water supply well, spring, septic system? Y N N/A 18 Is infiltration feasible on the site relative to groundwater-related criteria? Y N Provide rationale for feasibility determination: Note: if a single criterion or group of criteria would render infiltration infeasible, it is not necessary to evaluate every question in this worksheet. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 15 Table 2.7: Infiltration BMP Feasibility Worksheet Infeasibility Criteria Yes No 1 Would Infiltration BMPs pose significant risk for groundwater related concerns? Refer to Appendix VII (Worksheet I) for guidance on groundwater- related infiltration feasibility criteria. No Provide basis: Summarize findings of studies provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. 2 Would Infiltration BMPs pose significant risk of increasing risk of geotechnical hazards that cannot be mitigated to an acceptable level? (Yes if the answer to any of the following questions is yes, as established by a geotechnical expert):  The BMP can only be located less than 50 feet away from slopes steeper than 15 percent  The BMP can only be located less than eight feet from building foundations or an alternative setback.  A study prepared by a geotechnical professional or an available watershed study substantiates that stormwater infiltration would potentially result in significantly increased risks of geotechnical hazards that cannot be mitigated to an acceptable level. Yes Provide basis: Soil report indicated top of siltstone at about elevation 52 feet is not recommend for infiltration. 3 Would infiltration of the DCV from drainage area violate downstream water rights? No Provide basis: Summarize findings of studies provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 16 Table 2.7: Infiltration BMP Feasibility Worksheet (continued) Partial Infeasibility Criteria Yes No 4 Is proposed infiltration facility located on HSG D soils or the site geotechnical investigation identifies presence of soil characteristics which support categorization as D soils? Yes Provide basis: Summarize findings of studies provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. 5 Is measured infiltration rate below proposed facility less than 0.3 inches per hour? This calculation shall be based on the methods described in Appendix VII. No Provide basis: Summarize findings of studies provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. 6 Would reduction of over predeveloped conditions cause impairments to downstream beneficial uses, such as change of seasonality of ephemeral washes or increased discharge of contaminated groundwater to surface waters? No Provide citation to applicable study and summarize findings relative to the amount of infiltration that is permissible: Summarize findings of studies provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. 7 Would an increase in infiltration over predeveloped conditions cause impairments to downstream beneficial uses, such as change of seasonality of ephemeral washes or increased discharge of contaminated groundwater to surface waters? No Provide citation to applicable study and summarize findings relative to the amount of infiltration that is permissible: Summarize findings of studies provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 17 Table 2.7: Infiltration BMP Feasibility Worksheet (continued) Infiltration Screening Results (check box corresponding to result): 8 Is there substantial evidence that infiltration from the project would result in a significant increase in I&I to the sanitary sewer that cannot be sufficiently mitigated? (See Appendix XVII) Provide narrative discussion and supporting evidence: Summarize findings of studies provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. No 9 If any answer from row 1-3 is yes: infiltration of any volume is not feasible within the DMA or equivalent. Provide basis: Summarize findings of infeasibility screening Yes 10 If any answer from row 4-7 is yes, infiltration is permissible but is not presumed to be feasible for the entire DCV. Criteria for designing biotreatment BMPs to achieve the maximum feasible infiltration and ET shall apply. Provide basis: DCV shall be mitigated through bioretention with underdrain. Summarize findings of infeasibility screening Yes 11 If all answers to rows 1 through 11 are no, infiltration of the full DCV is potentially feasible, BMPs must be designed to infiltrate the full DCV to the maximum extent practicable. No Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 18 IV.3.2 Infiltration BMPs Identify infiltration BMPs to be used in project. If design volume cannot be met, state why. Name Included? Bioretention without underdrains Rain gardens Porous landscaping Infiltration planters Retention swales Infiltration trenches Infiltration basins Drywells Subsurface infiltration galleries French drains Permeable asphalt Permeable concrete Permeable concrete pavers Other: Other: Show calculations below to demonstrate if the LID Design Strom Capture Volume can be met with infiltration BMPs. If not, document how much can be met with infiltration and document why it is not feasible to meet the full volume with infiltration BMPs. Infiltration is not feasible per soil report recommendation. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 19 Worksheet J: Summary of Harvested Water Demand and Feasibility 1 What demands for harvested water exist in the tributary area (check all that apply): 2 Toilet and urinal flushing x 3 Landscape irrigation x 4 Other:_______________________________________________________ □ 5 What is the design capture storm depth? (Figure III.1) d 0.7 inches 6 What is the project size? A .209 ac 7 What is the acreage of impervious area? IA .127 ac For projects with multiple types of demand (toilet flushing, irrigation demand, and/or other demand) 8 What is the minimum use required for partial capture? (Table X.6) 570 gpd 9 What is the project estimated wet season total daily use (Section X.2)? 740 gpd 10 Is partial capture potentially feasible? (Line 9 > Line 8?) Yes For projects with only toilet flushing demand 11 What is the minimum TUTIA for partial capture? (Table X.7) 86 12 What is the project estimated TUTIA? 38 13 Is partial capture potentially feasible? (Line 12 > Line 11?) No For projects with only irrigation demand 14 What is the minimum irrigation area required based on conservation landscape design? (Table X.8) 0.140 ac 15 What is the proposed project irrigated area? (multiply conservation landscaping by 1; multiply active turf by 2) 0.082x1=0.082 ac 16 Is partial capture potentially feasible? (Line 15 > Line 14?) No Provide supporting assumptions and citations for controlling demand calculation: Min. Irrigation Area Req’d = 0.77x0.140 ac = 0.108 ac Area of irrigation, 0.082 ac, of the project site is to be considered infeasible for harvesting and re-use system that meets the minimum requirement for partial capture. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 20 IV.3.3 Evapotranspiration, Rainwater Harvesting BMPs If the full Design Storm Capture Volume cannot be met with infiltration BMPs, describe any evapotranspiration and/or rainwater harvesting BMPs included. Name Included? All HSCs; See Section IV.3.1 Surface-based infiltration BMPs Biotreatment BMPs Above-ground cisterns and basins Underground detention Other: Other: Other: Show calculations below to demonstrate if the LID Design Storm Capture Volume can be met with evapotranspiration and/or rainwater harvesting BMPs in combination with infiltration BMPs. If not, document below how much can be met with either infiltration BMPs, evapotranspiration, rainwater harvesting BMPs, or a combination, and document why it is not feasible to meet the full volume with these BMP categories. Harvesting and re-use system will not be considered due lack of minimum required landscape area. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 21 IV.3.4 Biotreatment BMPs If the full Design Storm Capture Volume cannot be met with infiltration BMPs, and/or evapotranspiration and rainwater harvesting BMPs, describe biotreatment BMPs included. Include sections for selection, suitability, sizing, and infeasibility, as applicable. Name Included? Bioretention with underdrains Stormwater planter boxes with underdrains Rain gardens with underdrains Constructed wetlands Vegetated swales Vegetated filter strips Proprietary vegetated biotreatment systems Wet extended detention basin Dry extended detention basins Other: Other: Show calculations below to demonstrate if the LID Design Storm Capture Volume can be met with infiltration, evapotranspiration, rainwater harvesting and/or biotreatment BMPs. If not, document how much can be met with either infiltration BMPs, evapotranspiration, rainwater harvesting BMPs, or a combination, and document why it is not feasible to meet the full volume with these BMP categories. Lot Area= 9115 s.f.; Roof Top and Hardscape area = 6863 s.f Impervious = 6863/9115= 0.753 C=0.75*0.753+0.15=0.715 DCV=0.715*0.7/12*9115= 380 CF Bioretention with underdrain is selected to mitigate DCV1 (380 cf). See calculation next page. Soil Amended Specification shall have infiltration rate of 2.5 in/hr. Section IV 1424 Galaxy Dr. North OC Priority WQMP Template August 17 2011 Page 20a Priority on Project Water Quality Management Plan (WQMP) Chen Residence Worksheet C: Capture Efficiency Method for Volume‐Based, Constant Drawdown BMPs Step 1: Determine the design capture storm depth used for calculating volume 1 Enter design capture storm depth from Figure III.1, d (inches) d= .70 inches 2 Enter calculated drawdown time of the proposed BMP based on equation provided in applicable BMP Fact Sheet, T (hours) T= 7.2 hours 3 Using Figure III.2, determine the "fraction of design capture storm depth" at which the BMP drawdown time (T) line achieves 80% capture efficiency, X1 X1= 0.40 4 Enter the effect depth of provided HSCs upstream, dHSC (inches) (Worksheet A) dHSC= n/a inches 5 Enter capture efficiency corresponding to dHSC, Y2 (Worksheet A) Y2= n/a % 6 Using Figure III.2, determine the fraction of "design capture storm depth" at which the drawdown time (T) achieves the equivalent of the upstream capture efficiency(Y2), X2 X2= n/a 7 Calculate the fraction of design volume that must be provided by BMP, fraction = X1 - X2 fraction= 0.40 8 Calculate the resultant design capture storm depth (inches), dfraction= fraction × d dfraction= 0.28 inches Step 2: Calculate the DCV 1 Enter Project area tributary to BMP (s), A (acres) A= 0.209 acres 2 Enter Project Imperviousness, imp (unitless) imp= 0.753 3 Calculate runoff coefficient, C= (0.75 x imp) + 0.15 C=0.715 4 Calculate runoff volume, Vdesign= (C x drfraction x A x 43560 x (1/12)) Vdesign= 151.8 cu-ft Supporting Calculations Describe system: Enclosed Planter Box w/ 24” ponding depth, 3” mulch layer, 24” of top soil/planting mix, over pea gravel w/ a 4” diameter underdrain pipe. Total Planter per figure II in Section VI of WQMP = A= Vdesign/ Ponding Depth (dp) = 151.8cf/ 2.0 ft = 75.9 sq. ft. Area provided = 77 s.f. >> 75.9 s.f. OK Bioretention with underdrain is selected to motigate DCV 313 c.f. Provide drawdown time calculations per applicable BMP Fact Sheet: DD = (dp/Kmedia)*12 in/ft = (1.5/2.5) *12 = 7.2 hours Kmedia = 2.5 in/hr per TGD Appendix XIV-53 TECHNICAL GUIDANCE DOCUMENT APPENDICES III-11 May 19, 2011 Figure III.2. Capture Efficiency Nomograph for Constant Drawdown Systems in Orange County Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 22 IV.3.5 Hydromodification Control BMPs Hydromodification Control BMPs BMP Name BMP Description N/A IV.3.6 Regional/Sub-Regional LID BMPs Describe regional/sub-regional LID BMPs in which the project will participate. Refer to Section 7.II- 2.4.3.2 of the Model WQMP. Regional/Sub-Regional LID BMPs Not Available Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 23 IV.3.7 Treatment Control BMPs Treatment Control BMPs BMP Name BMP Description N/A Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 24 IV.3.8 Non-structural Source Control BMPs Non-Structural Source Control BMPs Identifier Name Check One If not applicable, state brief reason Included Not Applicable N1 Education for Property Owners, Tenants and Occupants N2 Activity Restrictions N3 Common Area Landscape Management This is a residential development N4 BMP Maintenance N5 Title 22 CCR Compliance (How development will comply) This is a residential development N6 Local Industrial Permit Compliance This is a residential development N7 Spill Contingency Plan This is a residential development N8 Underground Storage Tank Compliance This is a residential development N9 Hazardous Materials Disclosure Compliance This is a residential development N10 Uniform Fire Code Implementation N11 Common Area Litter Control This is a residential development N12 Employee Training This is a residential development N13 Housekeeping of Loading Docks This is a residential development N14 Common Area Catch Basin Inspection This is a residential development N15 Street Sweeping Private Streets and Parking Lots This is a residential development N16 Retail Gasoline Outlets This is a residential development Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 25 N1. Education for Property Owners, Tenants and Occupants Educational handouts will be prepared and given to property owner, Medhi Karimpour, for his file and reference. Property will share these materials with others in his family. N2. Activity Restriction Some activities, such as painting, oil change, hazardous material use, etc., will be restricted on site and covered in the educational handouts. Property owner’s family shall be made aware of these restrictions. N4. BMP Maintenance Owner or his maintenance contractor will be responsible for BMP inspection and maintenance activities. The criteria for maintenance repair or replacement, including frequency and responsibility, are shown in Section V. The owner shall also create his inspection log sheets in order to document BMP maintenance activities. N10. Uniform Fire Code Implementation The discharge of any waste liquid containing crude petroleum or its products “into or upon” any drainage canal or ditch, storm drain, sewer, or upon the ground within the site is prohibited. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 26 IV.3.9 Structural Source Control BMPs Fill out structural source control check box forms or provide a brief narrative explaining if structural source controls were not used. Structural Source Control BMPs Identifier Name Check One If not applicable, state brief reason Included Not Applicable S1 Provide storm drain system stenciling and signage No storm drains inlets present near the site S2 Design and construct outdoor material storage areas to reduce pollution introduction This is a residential lot. S3 Design and construct trash and waste storage areas to reduce pollution introduction This is a residential lot. S4 Use efficient irrigation systems & landscape design, water conservation, smart controllers, and source control S5 Protect slopes and channels and provide energy dissipation No slopes & channel present near the site Incorporate requirements applicable to individual priority project categories (from SDRWQCB NPDES Permit) S6 Dock areas This is a residential lot. S7 Maintenance bays This is a residential lot. S8 Vehicle wash areas This is a residential lot. S9 Outdoor processing areas This is a residential lot. S10 Equipment wash areas This is a residential lot. S11 Fueling areas This is a residential lot. S12 Hillside landscaping This is a residential lot. S13 Wash water control for food preparation areas This is a residential lot. S14 Community car wash racks This is a residential lot. S4. Use efficient irrigation systems & landscape design, water conservation, smart controllers, and source control The proposed irrigation systems are designed to meet each landscape area’s specific water requirement. The owner or his maintenance staff will adjust the timing and application methods of irrigation water, when needed, to minimize the runoff of excess irrigation water into the municipal storm drain system. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 27 IV.4 Alternative Compliance Plan (If Applicable) Describe an alternative compliance plan (if applicable). Include alternative compliance obligations (i.e., gallons, pounds) and describe proposed alternative compliance measures IV.4.1 Water Quality Credits Determine if water quality credits are applicable for the project. Description of Proposed Project Project Types that Qualify for Water Quality Credits (Select all that apply): Redevelopment projects that reduce the overall impervious footprint of the project site. Brownfield redevelopment, meaning redevelopment, expansion, or reuse of real property which may be complicated by the presence or potential presence of hazardous substances, pollutants or contaminants, and which have the potential to contribute to adverse ground or surface WQ if not redeveloped. Higher density development projects which include two distinct categories (credits can only be taken for one category): those with more than seven units per acre of development (lower credit allowance); vertical density developments, for example, those with a Floor to Area Ratio (FAR) of 2 or those having more than 18 units per acre (greater credit allowance). Mixed use development, such as a combination of residential, commercial, industrial, office, institutional, or other land uses which incorporate design principles that can demonstrate environmental benefits that would not be realized through single use projects (e.g. reduced vehicle trip traffic with the potential to reduce sources of water or air pollution). Transit-oriented developments, such as a mixed use residential or commercial area designed to maximize access to public transportation; similar to above criterion, but where the development center is within one half mile of a mass transit center (e.g. bus, rail, light rail or commuter train station). Such projects would not be able to take credit for both categories, but may have greater credit assigned Redevelopment projects in an established historic district, historic preservation area, or similar significant city area including core City Center areas (to be defined through mapping). Developments with dedication of undeveloped portions to parks, preservation areas and other pervious uses. Developments in a city center area. Developments in historic districts or historic preservation areas. Live-work developments, a variety of developments designed to support residential and vocational needs together – similar to criteria to mixed use development; would not be able to take credit for both categories. In-fill projects, the conversion of empty lots and other underused spaces into more beneficially used spaces, such as residential or commercial areas. Calculation of Water Quality Credits (if applicable) Not Applicable Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section IV North OC Priority WQMP Template August 17 2011 Page 28 IV.4.2 Alternative Compliance Plan Information Not Applicable Section V Inspection/Maintenance Responsibility for BMPs BMP Inspection/Maintenance BMP Reponsible Party(s) Inspection/ Maintenance Activities Required Minimum Frequency of Activities Bioretention with underdrain Property owner Check for any clogging & remove any sediment deposit, debris, mulch & trash Twice a year or as needed or before each major storm event if occurs frequently. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section VI North OC Priority WQMP Template August 17 2011 Page 29 Section VI BMP Exhibit (Site Plan) VI.1 BMP Exhibit (Site Plan) VI.2 Submittal and Recordation of Water Quality Management Plan Following approval of the Final Project-Specific WQMP, three copies of the approved WQMP (including BMP Exhibit, Operations and Maintenance (O&M) Plan, and Appendices) shall be submitted. In addition, these documents shall be submitted in a PDF format. Each approved WQMP (including BMP Exhibit, Operations and Maintenance (O&M) Plan, and Appendices) shall be recorded in the Orange County Clerk-Recorder’s Office, prior to close-out of grading and/or building permit. Educational Materials are not required to be included. Priority on Project Water Quality Management Plan (WQMP) Chen’s Residence 1424 Galaxy Drive Section VII North OC Priority WQMP Template August 17 2011 Page 30 Section VII Educational Materials Refer to the Orange County Stormwater Program (ocwatersheds.com) for a library of materials available. Please only attach the educational materials specifically applicable to this project. Other materials specific to the project may be included as well and must be attached. Education Materials Residential Material (http://www.ocwatersheds.com) Check If Applicable Business Material (http://www.ocwatersheds.com) Check If Applicable The Ocean Begins at Your Front Door Tips for the Automotive Industry Tips for Car Wash Fund-raisers Tips for Using Concrete and Mortar Tips for the Home Mechanic Tips for the Food Service Industry Homeowners Guide for Sustainable Water Use Proper Maintenance Practices for Your Business Household Tips Other Material Check If Attached Proper Disposal of Household Hazardous Waste Recycle at Your Local Used Oil Collection Center (North County) Recycle at Your Local Used Oil Collection Center (Central County) Recycle at Your Local Used Oil Collection Center (South County) Tips for Maintaining a Septic Tank System Responsible Pest Control Sewer Spill Tips for the Home Improvement Projects Tips for Horse Care Tips for Landscaping and Gardening Tips for Pet Care Tips for Pool Maintenance Tips for Residential Pool, Landscape and Hardscape Drains Tips for Projects Using Paint