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4.0 SITE INVESTIGATION RESULTS A.—I Topography. Geology,and Mdrology 411 Topography The site is located at 521 North Cherokee Lane within the city of Lodi(Figure 2) The property is identified as San Joaquin County Assessors Parcel Number APN 041-274-56 and is located within the west central portion of Section 1,Township 3 North, Range 6 East,Mount Diablo Baseline and Meridian The ground surface elevation at the site is approximately 52 feet above mean sea level as determined by the U S Geological Survey, Lodi North 7 5 minute topographic map, scale 1 24,000 dated 1978 (Figure 3) The topography across the site consists of higher elevations along the northern and eastern portions of the property The main portion of the property has been graded to a level grade along the central portions of the property and is covered with a cement pad 412 Geology The subject property is underlain by over two hundred feet of interbedded, unconsolidated sediments overlying lithified sedimentary rock (Jones and Stokes, 1999) The unconsolidated sediments consist of interbedded sand,silt,and clay of the upper member of the Modesto Formation(QM2)ofPliocenc-Pleistocene age and the Riverbank and Formation of Pliocene-Pleistocene age(Figures 7 and 8) These sediments are underlain by the Riverbank and Laguna Formations of Pliocene-Pleistocene age,which consists of an upper unit of unconsolidated sands interbedded with clay, overlying moderately to well-indurated sandstone, conglomerate, and claystone(Wagner, 1981, Page, 1986) Older, non-marine and marine sediments are present beneath the site to a depth of approximately 35,000 feet below ground surface (Page, 1986) The low-lying Mokelumne River drainage in this portion of the Lodi area has been mapped by previous investigations as "Quaternary alluvium"(Wagner, 1981) The alluvial sediments in the Mokelumne River channel appear to consist of lenses of gravel, sand, silt and clay The U S Department of Agriculture has mapped the surface soils in the Lodi area to a general depth of five feet below ground surface as part of a regional investigation of soils(U S Department of Agriculture, 1992) Other investigations conducted in this area include Shlemon (1971 and Shlemon and Begg, 1975) The Mam\D\En"romnenW\PmwwTemco14-ports\SAR1203 Page 18 .�