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' Site Background Information- Ripon Farm Service <br /> Page 9 of 9 <br /> ADDITIONAL GROUND WATER ASSESSMENT <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 deternune if activities at the RFS facility have <br /> contributed to possible high nitrate concentrations in local ground water <br /> On 10 and 11 October 2005,four soil pilot borings for monitoring wells MW-101 through MW-104 t were advanced using a CME-75HT drill ng,equipped with 8 25-inch diameter hollow-stem augers <br /> The pilot borings were completed as ground water monitoring wells using two-inch diameter PVC j <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 /> I ' <br /> 1 <br /> 1 <br /> i <br /> Advanced GeoEnvirontpental,Inc. <br />