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ENVIRON,dENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> mi < Director304 East Weber Avenue,Third Floor Carl Sorgman,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 /> :, P • Program Manager Telephone: (209)468-3420 Douglas W.Wilson, R.E.H.S. <br /> °cl Fo acMargaret Lagorio,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> THRIFTY OIL COMPANY JUN 2 2 2005 <br /> MICHAEL BOWERY 1 CHRIS PANAITESCU <br /> 13116 IMPERIAL HWY <br /> SANTA FE SPRINGS CA 90670 <br /> RE: Thrifty Gas Station #171 SITE CODE: 1299 <br /> 1250 N. Wilson Way RO#: 0552 <br /> Stockton, CA 95205 <br /> San Joaquin County Environmental Health Department (SJCEHD) has reviewed <br /> Remedial Pilot Test— Remedial Action. Plan (RAP) received March 17, 2006 and has <br /> the following comments. <br /> This work was conducted in response to the EHD comment letter dated October 6, 2003 <br /> regarding Thrifty Oil Company's (TOC) Site Conceptual Model wherein EHD approved <br /> the installation of two ground water extraction (GWE) wells, one soil vapor extraction <br /> (SVE) well and remedial action testing. <br /> The RAP included a discussion of the results of GWE on the upper and deeper <br /> saturated zones beneath the site and SVE on the newly installed vapor well. Testing <br /> was conducted in March 2005 on wells "VW-5% "EW-5S" and "EW-5D". SVE tests were <br /> conducted to evaluate the practicability of dual phase extraction (DPE). <br /> Although no other remedial alternatives were discussed or compared with regard to <br /> either cost effectiveness or feasibility, TOC concluded that continued SVE with <br /> additional GWE (DPE)from the deeper zone (screened by EW-5D)would effectively <br /> reduce the elevated concentrations of petroleum contaminants currently in the ground <br /> water beneath the site. <br /> Using GWE to address elevated concentrations levels of dissolved petroleum requires <br /> additional considerations to be evaluated before EHD can complete our review of the <br /> RAP. Treatment methods, as well as disposal of the treated ground water were not <br /> discussed in the RAP. A discussion of the methods, materials, and manner of disposal <br /> of the treated water are to be evaluated by TOC and submitted to EHD. Disposal of the <br /> treated ground water to the City of Stockton's sewer system requires a permit from the <br /> Municipal Utilities Department. Please include a discussion of the feasibility of this <br /> option or other disposal options and costs in your comments. <br />