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ENVIRON%ENTAL HEALTH6EPARTMENT <br /> Donna Il. Heran, R.E.H.S. SAN JOAQUIN COUNTY Unit Supervisors <br /> :< 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Director <br /> Al Olsen, R.E.H.S. Stockton,California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> one: 209 468-3420 Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone:��iFORd P ( ) <br /> Margaret Lagorio,R.E.H.S. <br /> Laurie A. Cotulls, 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 /> DAVID BUCCOLO, SUPERINTENDENT SEP 12 2005 <br /> CENTRAL CALIFORNIA TRACTION COMPANY <br /> 2201 W WASHINGTON STREET #12 <br /> STOCKTON CA 95203-2942 <br /> RE: Central California Traction Company SITE CODE: 1536 <br /> 1645 Cherokee Lane <br /> Stockton CA 95205 <br /> In correspondence dated June 2, 2005 San Joaquin County Environmental Health <br /> Department(SJC/EHD) responded to a remedial action work plan that had been <br /> submitted on your behalf by Bohm Environmental Solutions (BES). The work plan <br /> proposed the destruction and re-installation of four onsite groundwater monitoring wells, <br /> and the remediation by excavation and removal of diesel impacted soil resulting from a <br /> leaking underground storage tank (UST). <br /> Four groundwater monitoring wells had been installed onsite between August 2000 and <br /> August 2001. The regional drop in the groundwater elevation beneath the site made the <br /> wells unusable as groundwater monitoring and sampling points since late 2001. <br /> SJC/EHD approved their proper destruction under permit and inspection, and approved <br /> the installation of new monitoring wells built to intercept first groundwater to replace them <br /> following completion of the proposed remediation. <br /> The work pian proposed the excavation of soil from an area of approximately 10 feet by <br /> 50 feet, to an average depth of 26 feet below surface grade (bsg)with the deepest point <br /> expected to be approximately 45 feet bsg. SJC/EHD approved in theory the use of <br /> excavation as a remedial option at this site, noting that a target cleanup goal of 750 <br /> milligrams per kilogram (mg/kg)residual diesel in soil, as presented by BES in the work <br /> plan, was not supported by any site specific data, calculations of contaminant mass <br /> remaining at this site, or fate and transport modeling. In addition, SJC/EHD stated that <br /> before a final corrective action plan could be approved for the site, a feasibility study <br /> utilizing site specific data must be prepared. BES subsequently submitted a calculation of <br /> contaminant mass and a feasibility study. In the feasibility study BES noted the target <br /> area of contaminated soil to be 18,000 cubic feet. <br /> Excavation activities began in late June 2005. By July 8, 2005 it was apparent the <br /> excavation was going to become larger than anticipated, as 'hotspots of oily <br /> contamination'were being encountered. These areas of contamination were followed for <br /> complete removal. On July 12, 2005 SJC/EHD learned that a drinking water well covered <br /> by a concrete sump had been discovered. The well was measured to be about 100 feet <br /> deep; the concrete sump on top of it was 4 feet x 4 feet x 15 feet tall, and contained <br />