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1 • • <br /> Limited Soil and Groundwater Report-05/24/99 Page 6 <br /> Western Oil& Spreading Site Project No 024 98 <br />' 3.0 GEOLOGY AND HYl<DR.OGEOLOGY <br /> 3.1 Geology and Regional Setting <br /> The site is located within the Great Valley Province of California The Great Valley is one of the <br /> largest structural depressions in the world It is approximately 400 mules long and 50 miles wide <br /> The topography of this Province varies from slightly below sea level to approximately 400 feet at its <br /> northern and southern ends Most of the surficial lithology of The Great Valley Province consists of <br /> mainly the alluvium flood and delta plain deposits of two mayor rivers (the Sacramento to the north <br /> and the San Joaquin to the south) and their tributaries, which account for approximately 40 percent <br /> of the total river discharge in California <br /> ' 3.2 Site Geology <br /> ' The site property rests on Quaternary Alluvium Deposits (Qal) consisting of interbedded silty sands <br /> to sandy silts <br /> 3.3 Hydrogeology <br /> The site is located within the San Joaquin Basin Hydrologic Study Area There are 26 groundwater <br /> ' basins in the study area The San Joaquin Valley covers 13,500 square miles and is the largest <br /> groundwater basin in the state The San Joaquin River drams most of the water in this basin The <br /> water bearing material consists of Younger and Older alluvium with a maximum thickness of 4,400 <br /> ' feet The well yields average 1,100 gpni, with a maximum yield of 3,200 gpm The site property <br /> rests near the north-central section of the Eastern San Joaquin County Basin This basin is bordered <br /> ' on the north by the Sacramento-San Joaquin county lines and to the south by the San Joaquin County <br /> line and the Stamslaus River The western boundary is the San Joaquin River and the southern <br /> boundary is designated by the edge of the alluvium <br /> r <br />