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r <br /> San Joaquin County Nlftd DIRECTOR <br /> �qurN Donna Heran,REHS <br /> Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> z. 600 East Main Street Laurie Gotufla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl 8orgman,REHS <br /> Mike Huggins,REHS, RDI <br /> gL'Fo�C' Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> 209 464-0138 Jeff Carruesco,REHS, RDI <br /> Fax: <br /> ( ) Kasey Foley,REHS <br /> VALLEY WATER TREATMENT JUN O 12007 <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 providing <br /> oversight for investigations and cleanup of releases from underground storage tanks (UST)within <br /> San Joaquin County. In February 1987, a gasoline UST was removed from the above referenced <br /> site and petroleum odor was detected in soil by EHD staff. The test results of the soil sample <br /> collected at the time of the UST removal were non detect for gasoline contaminants, but the <br /> laboratory detection levels were elevated. On 18 February 1994, EHD informed Servisoft of <br /> Central Valley that further site investigation would be required to determine the full extent of soil <br /> and groundwater contamination. <br /> An environmental site assessment was conducted on 25 February 2005. Soil and groundwater <br /> samples were collected. The analytical results confirmed contamination existed in the area of the <br /> former UST. On 27 April 2005, EHD placed the site in the Local Oversight Program for further <br /> investigation and cleanup. <br /> In December 2005 four monitoring wells (MW)were installed. Only MW-1 evidenced detectable <br /> soil or groundwater contamination. The analytical results of the soil and groundwater samples <br /> from MW2, MW3, and MW4 were all below detection limits. The soil and groundwater <br /> contamination from the UST release appears to be limited to the immediate area of the former <br /> UST where MW-1 is located. <br /> A well receptor survey of domestic, municipal, agricultural, and industrial wells within a 2,000-foot <br /> radius of this site was conducted. There does not appear to be any nearby receptors that are <br /> threatened by the unauthorized release. <br /> EHD received a corrective action work plan (CAP) prepared by Geo-Phase Environmental dated <br /> 12 December 2006. The CAP contains a feasibility study and cost analysis for several site <br /> remedial alternatives. The excavation of the contaminated soil in the immediate area of the <br /> former UST and extraction of groundwater from the open excavation was selected as the desired <br /> remediation method. <br /> In a letter dated 24 January 2007 EHD required additional investigation to further define the limits <br /> of soil and groundwater contamination prior to approving the proposed soil excavation and <br /> extraction of groundwater. <br />