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i <br /> 13 February 2006 <br /> Appendix A - Site Background <br /> Page 3 of 4 <br /> principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground <br /> Water Basin (Basin 5-22) This basin is drained primarily by the San Joaquin River <br /> The closest surface water feature to the site is the Stanislaus River located approximately 9,000 feet <br /> south of the site The river is used primarily for domestic and agricultural uses and recreational <br /> boating <br /> LOCAL GROUND WATER SETTING <br /> Ground water is currently encountered at a depth of approximately 28 feet below surface grade(bsg) <br /> at the site and has a north to northwesterly flow direction Ground water occurs in a generally sandy <br /> layer extending relatively horizontal and somewhat continuous over the site <br /> WELL SURVEY <br /> A survey of ground water wells within 2,000 feet of the subject property was conducted on 18 <br /> . November 1998 Domestic Wells Water at the site is currently supplied by a domestic well,located <br /> at the southern edge of the site Off-site domestic wells include a well north of the site, which <br /> supplies water for the adjacent Jimco Truck Stop, one well which serves the residence northeast of <br /> the site and one well which serves a small restaurant and truck-wash station south of the site This <br /> well is schedule for destruction due to high nitrate contamination Municipal Wells The City of <br /> Ripon has established twelve wells,five of the twelve wells have been either abandoned or are off- <br /> line due to the presence of high nitrate concentrations Seven wells are operational and are tested or <br /> have been tested for California Title 22 contaminants One well is located approximately 750 feet <br /> west of the site, this well is the only municipal well within 2,000 feet of the site <br /> MONITORING WELL INSTALLATION <br /> The Central Valley Regional Water Quality Control Board (CVRWQCB) directed by letter dated <br /> 16 July 2004 that RFS should characterize the quality of ground water,as well as ground water flow <br /> direction and gradient, at the RFS facility to determine if activities at the RFS facility have <br /> contributed to possible high nitrate concentrations in local ground water <br /> i <br /> Advanced GeoEnvironmentai,Inc <br />