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LI <br />The County speculates that the cause of impact at groundwater well G-4 was landfill gas. A LFG <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&SL <br />Joint Technical Document <br />Page 22 of 69 Public Works/Solid Waste <br />County of San Joaquin - February 10, 2010 <br />