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ENVIROIAENTAL HEALTH 'REPARTMENT <br /> Pp.U1N SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.$. Program Coordinators <br /> "• ' '� Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> • cgliko'RN�P. Assistant Director Telephone: (209)468-3420 Margaret Lagorio, R.E.H.S. <br /> Robert McClellon,R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco,R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley,R.E.H.S. <br /> JERRY CASTRO JUL 112OD6 Thr <br /> PACIFIC CAR WASH y-sem"O9 <br /> 4405 PACIFIC AVE <br /> STOCKTON CA 95207 <br /> Re: Pacific Car Wash Site Code:1215 <br /> 4405 Pacific Ave. RO#: 00392 <br /> Stockton, CA. 95207 CUF#: 012215 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Ground <br /> Water Aquifer Pumping Test Report—January2006(Report) submitted by your <br /> consultant, Advanced GeoEnviron mental, Inc (AGE) and has the following comments. <br /> The Report details a ground water pumping test conducted on extraction well, "EW-1" on <br /> January 24 and 25, 2006. The proposal to conduct the test was approved by EHD on <br /> May 7, 2003. <br /> Multiple rate pumping tests were conducted on the 6-inch PVC extraction well and the <br /> conclusion included in the Report stated that `pump test results suggested that <br /> extraction well EW-1 was not able to sustain a pumping rate of 2 GPM(gallons per <br /> minute) after approximately 60 minutes of continuous pumping operation"and the well <br /> dewatered at rates higher than 2 GPM. Recommendations included in the report stated <br /> that ground water extraction (GWE) was a feasible remediation option for removal of <br /> hydrocarbon-impacted ground water at the site and that an additional GWE well should <br /> be installed —100 feet to the northeast. <br /> EHD has evaluated the ground water plume at this site and determined that offsite <br /> migration is a major concern. In addition to removing the dissolved petroleum <br /> constituents from the ground water, EHD required that the plume's migration be <br /> controlled and dissolvedl petroleum not be allowed to move offsite and continue to <br /> degrade the ground water quality down gradient to the north east, across Pacific <br /> Avenue. <br /> Data included in the Report indicated that even low volume pumping rates were <br /> unsustainable in EW-1 and these low rates did not substantially influence the ground <br /> water at nearby monitoring wells measured during the pump tests. Based on low <br /> pumping rates and lack of substantial influence on the ground water and its migration, <br /> EHD cannot concur with AGE that GWE would be a feasible remedial option at this time. <br />