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ENTAL HEALTHa DEPARTMENT <br /> ENVIRONMENTAL `'pVNTY " <br /> PA"u�N SAN JOAQUIN C Unit Supervisors <br /> ll p Carl Borgman,R-E.H.S. j <br /> .Donna K.Reran,R.l✓.xs. 304 East Weber Avenue,ThirdjFloar Mike Huggins,R-E.H.S.,R.D.I. i <br /> { { DirectarCalifornia 95202-2708 Douglas W.Wilson,R.E.H.S- <br /> y = Al Olsen,R.E.H.S. tOCktOri, <br /> Margaret Lagorio,R.E,H.S. <br /> _ .Q• Program Manager I elephOne: (209) 46�-342a Robert McClellon,R.E.H.S- <br /> c4 Laurie A,Cotulla,R.E.H.S. - Fax: (209) 464-013 8 " Mark Barecilos,R.E.H.S. <br /> Program Manager i <br /> THRIFTY OIL COMPANY OCT 0 b 2004 <br />'E MICHAEL BOWERY / CHRIS PANAITESCU <br /> i 13116 IMPERIAL HWY I <br /> i. SANTA FE SPRINGS CA 90670 <br /> SITE CODE: 1299 <br /> �l 3 <br /> RE. <br /> Thrift Gas Station #171 i RO#: 0000552 Y <br /> 1250 N. Wilson Way I� <br /> Stockton, CA. 95205 <br /> reviewed <br /> San Joaquin County Environmental Health Departmentedt mb(SJCEHD) <br /> CE D004 as submitted by <br /> Preliminary Site Conceptual Model (SCM) dated p :� <br /> Thrifty Oil Company (TOC} and has the following comrrmentg,,. <br /> This large comprehensive document incorporated soiland ground water laboratory data <br /> g <br /> cent C�� inv6stigation completed <br /> collected since December 1987 to the most recomme 'nts concerni g potential offsifec <br /> 2004. A recent sensitive receptor survey andand <br /> sources were included in the detailed SCM as well as iconclusions for delineaears to be <br /> recommendations for additional remedial well installation{s}. <br /> The model app <br /> adequate to describe the contaminant distribution and the s:!lgnificant subsurface T <br /> migration pathways. <br /> SJCEHD has concerns with the long screen lengths for some of the wells at this site. r <br /> Of particular concern is MW-5, built with 70 feet of screened interval and advanced <br /> through impacted soil. With soil vapors allowed to migrateinto this long screened <br /> interval, this conduit could further impact the ground water:Fbelow- During active SVE, <br /> the vapor portion of the of the problem may be ameliorated, but migrating water could <br /> still be a potential threat. Considering the uncertainties associated with this well's <br /> construction and setting, SJCEHD directs that MW-5ibe removed and reinstalled with a <br /> shorter screened interval. If.TOC feels additional zones should also be monitored, <br /> separate cased wells may be added to the work plan now clue at SJCEHD. <br /> p f} <br /> I � <br /> SJCEHD believes that TOC concerns regarding an dpgradient source at 1440 W. �. <br /> Harding are unsupported by the data. Based on ground water flow direction, TOC well <br /> TB-1, not MW-5 would be in the most down gradient°{position to detect contaminants in <br /> the ground water emanating from that location. TB-1i is not significantly impacted at this <br /> time. Well MW-4, located in the central western portion ofithe site, is also not <br /> significantly impacted at this time. <br /> �p 1 <br /> FILE COPY <br />