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tProject (Appendix A). The contractor ingress/egress point is the existing gate at the northerly end of Milo Candini drive. The Site will be accessed through the gate, turning left (west), and ' proceeding approximately 1,300 feet on a dirt access road to the Site. 1.2 SURROUNDING LAND USE ' The Site occupies an area approximately 200 feet x 300 feet and was surrounded by agricultural land until 2006 when the Big League Dreams baseball complex was constructed on the property ' bordering the eastern boundary of the firing range. Site topography is essentially flat with the exception of the impact berm. 1.3 REGIONAL GEOLOGY/HYDROGEOLOGY ' The following information on regional geology and hydrogeology is reproduced from the October 6, 2003 Manteca General Plan 2023,Draft Environmental Impact Report and the ' Department of Water Resources California's Groundwater Bulletin 118 and San Joaquin County Groundwater Investigation Bulletin 146. ' Manteca is located in the San Joaquin Valley which is located in the southern section of the Great Central Valley of California. The Great Central Valley is a sedimentary basin located within a broad structural trough bounded by the tilted block of the Sierra Nevada on the east and ' the complexly folded and faulted Coast Ranges on the west. Almost all of the sediments that fill the Great Central Valley eroded from the Sierra Nevada. The oldest of these sediments are full of fragments of volcanic rocks eroded from its early volcanoes. As erosion stripped the cover of ' volcanic rocks from the granites of the Sierra Nevada,their detritus of pale quartz and feldspar sand began to wash into the Great Central Valley. ' Drainage into the San Joaquin Valley is mainly from the Sierra Nevada. The sediments on the valley floor were deposited within the past one-two million years, some within the past few thousand years. ' The elevation ranges from approximately 10-50 feet above sea level, gently rising from the San Joaquin River on the west toward the east and the Sierra Nevada. ' The Site lies within the San Joaquin Valley Groundwater Basin, Eastern San Joaquin Subbasin. The Eastern San Joaquin Subbasin is defined by the areal extent of unconsolidated to ' semiconsolidated sedimentary deposits that are bounded by the Mokelumne River on the north and northwest; San Joaquin River on the west; Stanislaus River on the south; and consolidated bedrock on the east. The Eastern San Joaquin Subbasin is drained by the San Joaquin River and ' several of its major tributaries namely,the Stanislaus, and Calaveras, and Mokelumne Rivers. Water bearing formations of significance in the Eastern San Joaquin Subbasin consist of the Alluvium and Modesto/Riverbank Formations, Flood Basin Deposits, Laguna Formation, and Mehrten Formation. Review of Plate 5, Section C-C' suggests the Site is underlain by Alluvium and the Victor Formation to a depth of approximately 100 feet below sea level and the Laguna Formation to approximately 300 feet below sea level. ' AQ%JPACIFIC EDGE ENGINEERING 2 SREW_Manteca_draft.docx ��666 (949)470-1937;(949)470-0943(FAX)