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11 <br /> EDMUND G.BROM in. <br /> oa`Ena <br /> COLI IOAEIA MAI m PamwuEt <br /> Water Boards <br /> FAOIOC[gM <br /> Central Valley Regional Water Quality Control Board <br /> 20 November 2017 <br /> Mr. Phil Johnson, President <br /> Sims-Grupe Management <br /> General Partner for Lincoln Properties, Ltd. <br /> 374 Lincoln Center <br /> Stockton, CA 95207 <br /> RESPONSE TO SITE INVESTIGATION WORK PLAN, PARKWOODS SHOPPING CENTER <br /> AND PARKWOODS CLEANERS, 1762 WEST HAMMER LANE, STOCKTON, <br /> SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the 15 November 2017 Site Investigation Work Plan (Work Plan) prepared by GSI <br /> Environmental Inc. (GSI) on behalf of Sims-Grupe Management Corporation (Sims-Grupe), <br /> general partner for Lincoln Properties, Limited. The Work Plan presents Sims-Grupe's plan to <br /> investigate the potential presence of tetra ch loroethene (PCE) in soil and soil gas at Parkwoods <br /> Shopping Center, located on West Hammer Lane between Brentwood Drive and Alexandria <br /> Place in Stockton, San Joaquin County (Site). Sims-Grupe submitted the Work Plan to fulfill <br /> Required Action #2 of Water Code Section 13267 Order No. R5-2017-0835 for Submittal of <br /> Operating Information, Technical Reports, and a Site Investigation Work Plan (Order), which <br /> was issued by the Central Valley Water Board on 13 September 2017. Required Action #2 of <br /> the Order required that within 60 days, Sims-Grupe submit a work plan to investigate soil gas <br /> and groundwater beneath the Site. <br /> In the Work Plan, Sims-Grupe identified a total of 13 proposed sampling locations within the <br /> current and former dry cleaner locations, a potential former waste drum storage area, and <br /> adjacent to on-Site sewer laterals. At each location, Sims-Grupe proposes to: <br /> 1. Advance a soil boring to approximately 15 feet below ground surface (bgs) using <br /> direct-push drilling techniques with dual-cased drilling rods; <br /> 2. Screen recovered soil for the presence of volatile organic compounds (VOCs) using a <br /> photoionization detector(PID); <br /> 3. Select soil samples (approximately four per boring) based on observed lithology and PID <br /> screening results for laboratory analysis of VOCs by United States Environmental <br /> Protection Agency (USEPA) Method 82606; <br /> 4. Install temporary soil gas probes (two per boring) at depths of approximately 5 feet bgs <br /> and 15 feet bgs. GSI will construct the soil gas probes of/4-inch diameter Teflon tubing <br /> connected to a porous polyethylene soil gas sample probe. GSI will backfill the annular <br /> space around the probe with approximately 1 foot of#3 sand, and backfill the remaining <br /> annular space with granular bentonite hydrated with potable water in 1-foot lifts; <br /> KAm E. LoneLey BCD, P.E.,amm I PAMELA C.OPUMOM P.E.,BCEE,onmrme OFwcEn <br /> 11020 Sue Cancer 0"8 nM ftid Conlan.CA MW I www.WatwbesrcWLa&Uwdc@mWva11a1 <br /> 0 nccvauo FAPsa <br />