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f' KLE/NFELDER <br /> Bnghl hook.PigM1f Solu,ieru. <br /> • According to Sheet 1 of the State of California Division of Mines and Geology <br /> publication titled "Geologic Map of the Sacramento Quadrangle, California 1:250,000" <br /> dated 1981, the Norman's Nursery site is underlain by the lower member of the <br /> Modesto Formation ("QM2"), which is comprised of alluvium from the adjacent hills. <br /> Surrounding the site to the east and south is the andesitic conglomerate, sandstone <br /> and breccia of the Mehrten Formation ("Tm"). <br /> 2.4.4 Groundwater <br /> According to the San Joaquin County Flood Control and Water Conservation District's <br /> document titled "Groundwater Report," dated Spring 2008, the elevation of the <br /> unconfined aquifer beneath the Norman's Nursery area is approximately -10 feet mean <br /> sea level (msl), and groundwater flows towards the southwest. According to the same <br /> report, the depth to the unconfined aquifer in the area of the project site is <br /> approximately 140 to 150 feet below the ground surface (bgs). <br /> Subsurface investigations in the area of the project site have shown shallow perched <br /> • groundwater zones in some areas. The results of the subsurface investigations do not <br /> support continuity of perched groundwater zones across the site area. Evidence of <br /> springs and vernal pools also exist in the area. <br /> The origin of the shallow groundwater zones (assumed to be perched) encountered in <br /> monitoring wells MW-2 and MW-5, and test pits TP-2 and TP-4 is unknown. Its <br /> occurrence may be seasonal; however, the absence of free water in the test pits in the <br /> center portion of the property and the historic lack of perched water in Monitoring Wells <br /> MW-4s and MW-4d, suggest multiple perched groundwater zones. In addition, the lack <br /> of perched groundwater in the center of the property appears to indicate that the <br /> perched groundwater in monitoring wells MW-2 and MW-5 does not represent a single <br /> continuous perched groundwater zone for which a groundwater flow direction and <br /> gradient can be calculated across the entire site. <br /> • <br /> 117226.E02IST012R0696 Page 6 of 43 September 14, 2012 <br /> Copyright 2012 Kleinfelder <br />