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v <br />C <br />n <br />The County speculates that the cause of impact at groundwater well G-4 was landfill gas. A FFG <br />collection and treatment system was installed in 2006 to prevent offsite subsurface migration of <br />landfill gas and to further safeguard against groundwater contamination. <br />VOCs are found at many of the soil gas wells; however, the presence of VOCs in the soil gas at <br />the concentrations detected does not appear to threaten groundwater quality. <br />North County RC&SI_ <br />Joint Technical Document <br />Page 22 of 68 Public Works/Solid Waste <br />County of San Joaquin — October 10, 2014 <br />