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ENVIROMIENTA ALTH'01EPARTMENT <br /> Donna K. Heran,R.E.H.S. SAN JOAQUIN COUNTY <br /> •,� Unit Supervisors <br /> t <br /> W- :< Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen, R.E.H.S. Stockton,Califomia 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> • �p Program Manager Telephone: 209 468-3420 Douglas W.Wilson,R.E.H.S. <br /> �iRdied Laurie A. Cotulla, R.E.H.S. Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209)464-0138 Robert McClellon,R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco,R.E.H.S. <br /> FASSEL & AMAL ELDER OCT 2 6 2005 <br /> 4880 PEACH AVE <br /> MANTECA CA 95337 <br /> RE: Country Club Food Fuel Site Code#: 1069 <br /> 1850/1856 Country Club Blvd ROM 660 <br /> Stockton, CA. 95204 CUF#: 014971 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Quarterly Report— Second Quarter 2005(QMR)dated September 15, 2005 as <br /> submitted by your consultant, Advanced GeoEnvironmental Inc (AGE) and has <br /> the following comments. <br /> The QMR also included a report of findings for the additional subsurface site. <br /> investigation (soil borings)conducted during May 2005. <br /> The most recent ground water analytical data on GeoTracker is this QMR which <br /> includes the sampling on April 15, 2005. Low levels of MtBE and Total <br /> Petroleum Hydrocarbons as gasoline (TPHg) are present in MWA and MW-3. <br /> During the subsurface investigation in March 2005, GeoProbe push points, B-1 <br /> through B-5 were placed on and offsite to determine the lateral and vertical <br /> extents of the dissolved petroleum plume. <br /> Soil boring B-1 had MtBE in the ground water grab sample collected at 46 feet <br /> below ground surface (bgs). None of the soil samples nor any of the other grab <br /> ground water samples had detections of contamination. <br /> EHD has evaluated this site for a no further action required determination. In <br /> reviewing the historical ground water data (contaminant concentrations, ground <br /> water gradient, depth to water, etc), EHD became concerned with the increasing <br /> groundwater contaminant levels beginning in June 2002. Concentrations of <br /> MtBE in the groundwater samples from MW 1 rose from 8.7 ug/I in January 2002 <br /> to 440 ug/I in June 2002. In August 2003, the concentration of MTBE in the <br /> sample from MW 1 had risen to 1,200 ug/I. Also in August 2003, detection of <br /> TPI-Ig in the water samples from MW1 began. When MtBE concentrations in the <br /> groundwater samples increase, then TPI-Ig is detected in the groundwater <br /> samples and first ground water is only 10 below grade it may indicate that a <br /> release occurred. <br />