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VOW ..i <br /> GT <br /> It <br /> San Joaquin County <br /> .C, Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> Q. 600 East Main Street <br /> N' j Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> L Robert McClellon,REHS <br /> '�. Jeff Carruesco, REHS,RDI <br /> CQ�/FOR�`P Website: www.sjgov.org/ehd Kasey LndaTuolley,Rrkatte, HS <br /> Phone: (209) 468-3420 <br /> EHS <br /> Fax: (209) 464-0138 <br /> July 8, 2011 <br /> Mr. Remo Canepa <br /> Canepa's Car Wash <br /> 1536 N. Hunter Street <br /> Stockton, CA 95204 <br /> Subject: Canepa's Car Wash RO#: 0102 <br /> 248 E. Park CUF#: 01695 <br /> Stockton, CA 95202 APN: 13906035 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Dual <br /> Phase Extraction Pilot Test Report — April 2091 (DPE-PTR) that was received on <br /> Geotracker May 16, 2011. This report provided the results of the remedial 5-day pilot <br /> test conducted in April 2011 when groundwater and soil gas samples were collected <br /> from the test well DPE-1. The EHD concurs that DPE could be an effective remedial <br /> alternative for controlling the migration of the groundwater plume and removing <br /> significant petroleum hydrocarbon mass from the subsurface, but the following concerns <br /> must be addressed before the EHD can issue final approval. <br /> The EHD has reviewed Semi-Annual Report — Second Quarter 2099 (SAR) dated June <br /> 1, 2011, which was received on Geotracker June 10, 2011. The laboratory analytical <br /> data obtained by this most recent monitoring well sampling event supports the <br /> conclusions in the SAR that the second intermediate zone and the deep water bearing <br /> zones are "laterally undefined in every direction". This concern, in conjunction with the <br /> groundwater analytical data from the newest and deepest screened monitoring wells in <br /> the core of the plume (MW-18 and MW-19), indicate that the vertical extent of the <br /> groundwater plume is also undefined. Sites that do not have the groundwater plume <br /> adequately defined laterally and/or vertically cannot implement a remedial action plan <br /> (RAP). The EHD can approve an interim remedial action but in addition must require <br /> you to continue the investigative phase (delineate the lateral and vertical extents of the <br /> plume) concurrently. <br /> The EHD has also reviewed Remedial Action Work Plan (RAWP), dated May 15, 2011. <br /> The RAWP was submitted by your consultant based on conclusions in the DPE-PTR <br /> that dual phase extraction would be effective at cleaning up the site. In the RAWP, your <br /> consultant concluded that three additional DPE wells are needed near the `core' area of <br /> the groundwater plume to effectively mitigate the impact to the soil and groundwater <br /> beneath the site. <br /> 248 Park DPE Pilot Report CML 7-5-11.doc <br />