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Chevron U.S.A. - Page 9 <br /> Deposition of continental sediments has predominated in the area from the <br /> early Tertiary to the present. Generally, continental sediments ranging from <br /> Miocene to Holocene constitute the principal aquifer system in the area. Surface <br /> deposits consist of Holocene floodplain and fan deposits of the Modesto <br /> Formation. <br /> 6.2 . Hydrologic Setting <br /> The subject property is located within the San Joaquin Basin Hydrologic <br /> Study area, which includes roughly the southern two-thirds of the Great Central <br /> Valley. Within that area, a total of 39 ground water basins and areas of <br /> potential storage have been identified (DWR, 1980) . The inventory covers <br /> thirteen ground water basins which have been identified as significant sources of <br /> ground water. The subject property is situated within the eastern San Joaquin <br /> County Basin. <br /> The east San Joaquin County Basin is reported as being subject to critical <br /> overdraft (DWR, 1980) . Adverse affects associated with the overdraft include <br /> declining water levels and an eastern migration of saline water from the adjacent <br /> Delta sediments. <br /> L7:0 SOIL PROFILE AND SUBSURFACE CONDITIONS <br /> A total of three exploratory soil borings were advanced at the subject <br /> to an approximate maximum depth of 85 feet below the existing grade for <br /> property PP P <br /> the purpose of logging subsurface conditions, and to install ground water <br /> monitoring wells. <br /> DAMES & MOORE <br />