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�I <br /> PUBLIC HLALTH SERVICES <br /> SAN JOAQUIN COUNTY r z <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D ., M.P.H., Health Officer � . <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 ciFOR ' <br /> 209/468-3420 <br /> REMO CANEPA MAY 0 4 2001 <br /> CANEPAS CAR WASH <br /> 1536 N HUNTER <br /> STOCKTON CA 95204 <br /> RE: CANEPXS CAR WASH Site Code: 1225 <br /> 6230 PACIFIC AVENUE <br /> STOCKTON CA 95204 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) approves the workplan Soil <br /> BmTard Mmworvg Wd11rsw&txn dated November 17, 1999 prepared by Condor Earth Technologies (CET) on your <br /> behalf. The installation of three additional monitoring wells and three cone penetrometer testing (CPT) boreholes, <br /> proposed by CET in a letter dated May 18, 1999, is approved as well. In 1979, groundwater was measured at the site <br /> at a depth of 70 feet below ground surface (bgs) . Therefore, PHS/EHD recommends advancing the CPT borings to <br /> at least 100 feet bgs and collecting a grab groundwater sample at depth, in order to define the vertical extent of the <br /> groundwater contamination. Accordingly, the depths, locations, and screen lengths of the monitoring wells should be <br /> based on information collected during the CPT investigation. Submit a map of the proposed boring locations and <br /> monitoring well construction to PHS/EHD by May 20, 2001 and implement the proposed work by June 11, 2001. <br /> i <br /> PHS/EHD agrees to CET s request to use a KABIS sampler to collect multiple groundwater samples at different <br /> depths within the existing monitoring wells, as discussed in a meeting on January 17, 2001 . However, PHS/EHD <br /> does not agree that this will constitute definition of the vertical extent of the groundwater contamination. <br /> Groundwater flow direction and gradient have not been determined at the site due to the presence of a groundwater <br /> mound at the vicinity of the canopy and the carwash. Submit a work plan to PHS/EHD by August 5, 2001 that will <br /> describe the methodology you intend to employ to identify the source of the groundwater mound. <br /> Inaccordancewit hAPPBandSwffRaonrwilatoraforPralvrcnxryInastigationardEvduationoF <br /> �tt B, Ti-R�°� <br /> UrdeTvwxt Tank Site' — NoFwtherAaionRa7uats, a survey of wells within a 2000-foot radius of the site is required <br /> prior to site closure. Submit a survey of wells within a 2000-foot radius of the site along with a map showing the <br /> labeled locations and addresses of the wells, and anyknowa construction details of the wells to PHS/EHD by August <br /> 5, 200, as well. <br /> The soil vapor extraction (SVE) system was shut down by CET on February 6, 2001 in order to comply with the 95 <br /> destruction efficiency as required by the Air Resources Board. PHS/EHD recommends repairing the system to within <br /> the 95% destruction efficiency and restarting the system by June 5, 2001. <br /> Please feel free to contact Jeffrey Wong at (209) 468-0335 if you have any questions. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> pkzlv 3 p <br /> Jeffrey Wong , Sr. RENS Dot Lofstrom, R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation, Unit IV <br /> cc: RWQCB, Central ValleyRegion — MartyHartzell <br /> Condor Earth Technologies — David Wood <br /> A Division of San Joaquin County Health Care Services <br />