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San Joaquin County DIRECTOR <br /> Donna Heran,RENS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> (C44. <br /> Laurie Cotulla,REHS <br /> 600 East Main Street�< Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Mike Huggins,REHS,RDMargaret Lagorio,REHS <br /> Website: www.Sjgov.org/ehd Robert McClellon,REHS <br /> Foaa Phone: (209) 468-3420 Jeff Carruesco,REHS,RDI <br /> Fax: (209) 464-0138 Kasey Foley,REHS <br /> A <br /> March 23, 2009 <br /> Mr. John Parker <br /> 2151 Country Club Boulevard <br /> Stockton, CA 95204 <br /> Subject: Boulevard Auto Service RO#: 080 <br /> 2151 Country Club Blvd. SWRCB-CUF#: 12962 <br /> Stockton, CA 95205 Geotracker ID#: T0607700030 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Work Plan Addendum (Plan) dated December 29, 2008, Dual Phase Extraction Feasibility Study <br /> Work Plan (FS) dated January 9, 2009, and Request for Reduction of Monitoring Activities <br /> (Letter) dated February 2, 2009, all prepared by Advanced GeoEnvironmental, Inc. for the <br /> above referenced subject site. <br /> The Plan was submitted to address concerns discussed during a meeting with yourself, your <br /> consultant, and the EHD on November 7, 2008. The Plan proposes the installation of push point <br /> soil borings down gradient of the site toward the northeast to further investigate ground water <br /> impacted by dissolved petroleum hydrocarbons at depths between 40 and 50 feet below ground <br /> surface ('bgs). Push points "P-17" through "P-20" are to be installed in areas of concern in the <br /> city right of way. Soil samples are to be collected for lithological identification, while grab ground <br /> water samples are to be collected from each boring for laboratory analysis for total petroleum <br /> hydrocarbons quantified as gasoline (TPHg), benzene, toluene, ethylbenzene, xylene (BTEX), <br /> the fuel oxygenates and lead scavengers; collectively, these are the chemicals of concern <br /> (COC) impacting soil and groundwater due to an unauthorized release from the underground <br /> storage tank (UST) system formerly located on your site. <br /> Since the meeting when these push point locations were agreed upon, the ground water flow <br /> direction has changed and now is being reported as flowing toward the west/northwest. <br /> Currently monitoring wells MW-8, MW-11, MW-13, and MW-14 are located west of the site and <br /> MW-7, MW-19 and MW-20 are located north of the site. No monitoring wells are located in a <br /> 'gap' northwest of the site between these well clusters, the EHD is concerned that if the inferred <br /> groundwater flow direction is sustained that the dissolved plume may migrate though this 'gap'. <br /> MW-7 (north) is a 'first groundwater' well, screened from 4 feet to 24 'bgs in hydrological unit <br /> one (HU-1). The ground water samples from this monitoring well have been "non-detect" for the <br /> CDCs since May 2006. MW-8 (west) is screened across HU-1 and the ground water samples <br /> last analyzed from this well on February 2007 were also "non-detect". Future detection of <br /> dissolved TPHg concentrations in these wells may show that the apparent change of ground <br /> water flow direction is affecting the plume disposition. <br /> 2151 Country Club FS DPE M&R redc CML.3-23-09 <br />