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PUBLIC HEALTH SERVICES 'opg9CN„ <br /> SAN JOAQUIN COUNTY r. : •� a <br /> ENVIRONMENTAL HEALTH DIVISION „_ r <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <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: CANEPA'S CAR WASH Site Code: 1225 <br /> 6230 PACIFIC AVENUE <br /> STOCKTON CA 95204 <br /> San Joaquin County Public Health Services, Environment alth Division (PHS/EBD) approves the work planAd <br /> BairgarrlMa airg WdlImuffmix dated November 17 1999 repared by Condor Earth Technologies (CET) on your <br /> behalf. The installation of three additional monitoring we and three cone penetrometer testing (CP l) 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, PES/EBD 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/EBD byMay20, 2001 and implement the proposed work byjune 11, 2001. <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 sire due to the presence of a groundwater <br /> mound at the vicinity of the canopyand the carwash. Submit a work plan to PHS/EBD by August 5, 2001 that will <br /> describe the methodology you intend to employ to identify the source of the groundwater mound. <br /> In accordance with Appiziiic B, Tri-Regiawl Band StaffRerrn m%1av rafor1 rt& m ryIn sdgitimard Eud arriargr <br /> Urdegrw d Tdnz Sita — No FwtlxrAaiarRgmh;, a survey of wells within a 2000-foot radius of the site is required <br /> prior to site closure. Submit a surveyof wells within a 2000-foot radius of the site along with a map showing the <br /> labeled locations and addresses of the wells, and anyknown construction details of the wells to PHS/EBD byAugust <br /> S, 200, as well. <br /> The soil vapor extraction (SVE) system was shut down by CET on February 6, 2001 in order to complywith the 95% <br /> destruction efficiencyas required by the Air Resources. Board. PHS/EHD recommends repairing the system to within <br /> the 95% destruction efficiency and restating the system byjune 5, 2001, <br /> Please feel free to contact jeffrey Wong at (209) 468-0335 if you have any questions. <br /> Dorma Heran, RENS, Director <br /> Environmental Health Division <br /> jeffrey Wong , Sr. RENS ,v/ Dot Lofstrom, R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation, Unit IV <br /> cc: gMQCM Central ValleyRegion - MattyHartcell <br /> JCondor Earth Technologies - David Wood <br />