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i <br /> I <br /> 4 Flying J Travel Plaza <br /> PRELINUNARY SITE INVESTIGATION Ripon,CA <br /> �1 � <br /> 3.0 ENVIRONMENTAL SETTING <br /> Environmental characteristics including topography, soils, regional geology, and <br /> hydrogeology were evaluated based on.Site observation and published literature and maps. <br /> The following sections provide a discussion of the environmental characteristics of the Site. <br /> 3.1 Topography <br /> • I <br /> The Site is located within the south-central portion of the San Joaquin Valley and is situated <br /> , <br /> at an approximate elevation bf 70 feet above mean sea level. The local topography is <br /> generally flat with a .slight grade toward the south. The Stanislaus River is located <br /> approximately 2 mile southeast of the site. E <br /> 3.2 Regional Geology <br /> The subject site lies within the-Central or Great Valley of California.1 The Great Valley is an <br /> elongated lowland located between the.Sierra Nevada on the east and the Coast Ranges on <br /> the west. The southern portion of the Great Valley drained by the San Joaquin River is <br /> referred to as the San Joaquin Valley and the northern portion drained by the Sacramento <br /> River is referred to as the Sacramento Valley. Rocks of the Great Valley consist of <br /> sedimentary deposits ranging in age from late Mesozoic through Holocene (Recent).2 <br /> Unconsolidated continental deposits constitute the primary source of groundwater in the j <br /> Great Valley.-3 The continental deposits consist primarily of alluvium; however, some areas <br /> consist of permeable lake bed sediments. i <br /> � I <br /> 1 Norris, Robert M. and Robert W. Webb, 1990. Geology of California, 2nd edition, John Wiley& Sons, Inc., USA, 541 <br /> l pages. <br /> 2 Norris, Robert M. and Robert W. Webb, 1990. Geology of California, 2nd edition, John Wiley& Sons, Inc., USA, 541 <br /> pages. <br /> Geologic Map of California,Compilation by Charles W.Jennings,California Division of Mines and Geology, 1977. <br /> Davis, G. K. J. H. Green, F. H. Olmstead, and D. W. Brown, 1959. Ground-Water Conditions and Storage Capacity in <br /> the San Joaquin Valley,California, United States Geological Survey Water-Supply Paper 1469. <br /> 3 F. H. Olmstead and G.H. Davis, 1961. Ground-Water Conditions and Storage Capacity in the i <br /> Sacramento Valley, California, United States Geological Survey Water-Supply Paper 1497. ' <br /> E <br /> .I FLYING J INC. 5 OGI Project No.OGT-09-191 <br /> a <br />