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4.5 SURROUNDING LAND AND GROUNDWATER USE <br />4.5.1 Land Use <br />Land use surrounding the landfill site is described in Section1.4. <br />4.5.2 Groundwater Use <br />Groundwater use on and surrounding the property is agricultural applications and domestic use <br />(Appendix E). <br />There are eight wells on the landfill property, including: <br />• The well serving landfill operations, located south of the landfill office building (Plate 2). <br />• A domestic well serving the rental property portion on the northeast corner of the property. <br />• An agricultural well also located at the rental property portion on the northeast corner of <br />the property. <br />• Five groundwater monitoring wells. <br />Thirty-eight wells were identified within one mile of the landfill site. Screen depths (depth to <br />bottom of screen) varied from 100 feet to 700 feet below ground surface. Seven of the wells <br />appear to be down gradient of the site (west-southwest). First encountered groundwater in the <br />wells varied between 100 feet and 168 feet below ground surface. <br />The California Department of Water Resources' (DWR) files were reviewed in 2002 and included <br />in the "Report of Waste Discharge Related to the Permitting and Installation of Composite Landfill <br />Liner System for Module 4 and Future Modules" Appendix A). The DWR files were reviewed <br />again in August 2004 (Kleinfelder) but no new information was obtained during that review. <br />4.6 POTENTIAL IMPAIRMENT CAUSED BY NCRC&SL <br />The groundwater beneath the NCRC&SL does not appear impacted at this time. Except for one <br />compound detected above trace concentrations at one well (G-4) in one monitoring event <br />(August 2002), groundwater impact has not been indicated at the NCRC&SL. <br />North County RC&SL Page 21 of 69 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — February 10, 2010 <br />