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5.3 GEOLOGY <br /> This section describes the regional and site geology and hydrogeology of the NCRC&SL. The <br /> information included is intended to meet the requirements of Section 21750(f) of Title 27, which <br /> requires dischargers to assess the geologic condition of the site to provide information about: <br /> • The geologic setting <br /> • Faults, seismicity, and seismic hazards <br /> • Groundwater hydrogeology <br /> Information presented in this section is based on the Geologic and Hydrogeologic Report, <br /> Proposed Landfill Development Site, San Joaquin, County, California, dated September 1987, <br /> revised January 1988 and recent landfill gas probe and groundwater monitoring well boring logs. <br /> These sources can be found in Appendix D. <br /> 5.3.1 Geology <br /> 5.3.1.1 Regional Geology <br /> The NCRC&SL is located east of Lodi, California near the northwestern edge of the San Joaquin <br /> Valley. Alluvial sediments deposited by river and streams characterize the geology of the eastern <br /> portion of the San Joaquin Valley. The regional geology is summarized in.Appendix D. <br /> 5.3.1.2 Site Geology <br /> The 1988 report presented a site-specific topographic map and cross-sections (Drawings 1 and 2) <br /> of soils encountered in borings. Geologic maps of the site (Wagner, D.L., et. al, 1981 and <br /> Jennings, C.W. 1977) show that the geology consists of semi-consolidated Quaternary sediments <br /> of the Modesto and/or Riverbank formations. <br /> 5.3.1.3 Seismicity <br /> An assessment of seismicity at NCRC&SL was prepared in two separate reports. The peak <br /> ground acceleration was estimated to range from O.lg (1988 report) to 0.258 (1994 report). A <br /> North County RC&SL Page 20 of 48 Public Works/Solid Waste <br /> JTD County of San Joaquin—November 30,2004 <br />