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1 <br /> 1 Site Background Information - Ripon Farm Service <br /> • Page 9 of 9 <br /> 1 <br /> The Central Valley Regional Water Quality Control Board (CVRWQCB) directed by letter dated <br /> 1 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 /> 1 On 10 and 11 October 2005,four soil pilot borings for monitoring wells MW-101 through MW-104 <br /> were advanced using a CME-75HT drill rig,equipped with 8.25-inch diameter hollow-stem augers. <br /> 1 The pilot borings were completed as ground water monitoring wells using two-inch diameter PVC <br /> casing with 0.020-inch slotted screen installed from approximately 20 feet to 40 feet bsg with blank <br /> casing extended to the surface. <br /> 1 <br /> 1 <br /> i <br /> li <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 Advanced GeoEnvironmen[al,Inc. <br />