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21750(f) of Title 27 requires dischargers to assess the geologic condition of the site including: <br />0 <br />® The geologic setting <br />• Faults, seismicity, and seismic hazards <br />• Groundwater hydrogeology <br />4.3.1 Geology <br />4.3.1.1 Regional Geology (Soils) <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 (Appendix C). <br />0 4.3.1.2 Site Geology <br />u <br />The 1988 report presented a site-specific topographic map and cross -s (Appendix C Drawings 1 <br />and 2) 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 />4.3.1.3 Seismicity <br />An assessment of seismicity at NCRC&SL has been prepared by Dr. Norman Abrahamson in <br />2007 as part of the Preliminary Closure/Postclosure Maintenance Plan, Appendix B. The <br />average horizontal ground acceleration for the site was estimated to be 0.098g resulting from the <br />design earthquake (i.e. Maximum Probable Earthquake (MPE)) (Appendix B). <br />North County RC&SL Page 17 of 69 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — February 10, 2010 <br />