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i <br /> ENVIROP�AIENTAL HEALTHI)EPARTME <br /> PQuIN NT <br /> SAN JOAQUIN COUNTY <br /> NDonna K Heron, R.E.H.S. 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 /> cQ�i fid'Ri'`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 /> VALLEY WATER TREATMENT JAN 2 4 2007 <br /> C/O TED SWANSON <br /> 6520 CROSSWOODS CIRCLE <br /> CITRUS HEIGHTS CA 95620 <br /> RE: 612 N. Buena Vista LOP SITE: 0001714 <br /> Stockton, Ca. 95203 <br /> San Joaquin County Environmental Health Department (EHD) is the lead agency <br /> providing oversight for investigations and cleanup of releases from underground <br /> storage tanks (UST) within San Joaquin County. In February 1987, a gasoline <br /> UST was removed from the above referenced site and petroleum odor was <br /> detected in soil by EHD staff. The test results of the soil sample collected at the <br /> time of the UST removal were non detect for gasoline contaminants, but the <br /> laboratory detection levels were elevated. On February 18, 1994, EHD informed <br /> Servisoft of Central Valley that further site investigation would be required to <br /> determine the full extent of soil and groundwater contamination. <br /> An environmental site assessment was conducted on February 25, 2005. Soil <br /> and groundwater samples were collected and the analytical results confirmed <br /> contamination existed in the area of the former UST. The groundwater sample <br /> analytical results evidenced total petroleum hydrocarbons as gasoline (TPH-gas), <br /> benzene, toluene, ethyl-benzene and xylene (BTEX). EHD placed the site in the <br /> Local Oversight Program for further investigation and cleanup. <br /> A work plan to define the vertical and lateral extent of soil and groundwater <br /> contamination caused by the unauthorized release from the UST was approved <br /> by EHD and 4 monitoring wells (MW) were installed in December, 2005. Only <br /> MW-1 evidenced detectable soil or groundwater contamination. Soil and <br /> groundwater impact from the release appears to be limited to the immediate area <br /> of the former UST location where MW-1 is located. <br /> A well receptor survey of domestic, municipal, agricultural, and industrial wells <br /> within a 2,000-foot radius of this site was conducted. There does not appear to <br /> be any nearby receptors that are threatened by the unauthorized release. <br /> EHD received a corrective action work plan (CAP) prepared by Geo-Phase <br /> Environmental dated December 12, 2006. The CAP contains a feasibility study <br />