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6EW <br /> GENESIS ENGINEERING&REDEVELOPMENT <br /> Ms. Amy Terrell <br /> August 21, 2006 <br /> Page 2 <br /> been developed with predominantly industrial and agricultural uses from the 1950s to the <br /> present. Ripon Farm Services currently utilizes the Site for bulk distribution and batching of <br /> fertilizers. The Site has a wash-rack containment area with two concrete holding ponds, storage <br /> buildings, and a bulk fertilizer preparation area. A layout of the Site is presented on Figure 2. <br /> The United States Geological Survey topographic map, 1991 Manteca,places the Site at about <br /> 58 feet above mean sea level. Topography at the Site is relatively flat. The Stanislaus River is <br /> located approximately 1.75 miles southeast of the Site, and flows in a southwesterly direction. <br /> Geologic Setting <br /> The Site is located near the center of the Central Valley geomorphic province, an asymmetric <br /> synclinal trough characterized by extremely thick alluvial deposits on the western side of the <br /> axis. Surficial soils are the result of continental alluvial deposition in the flood plains of the San <br /> Joaquin and Stanislaus Rivers, and because of the structural down-warping, the overall alluvial <br /> section is up to 25,000 feet in the vicinity. The valley extends for 400 miles with a northwesterly <br /> trend and is about 50 miles wide at the latitude of Ripon. The near-surface soil profile is <br /> characterized by unconsolidated silty and clayey soils with irregular lenses of sand and gravel, <br /> typical of overbank fluvial deposition occurring during the Holocene Epoch(Norris and Webb <br /> 1990). <br /> Previous Site Investigation work by Advanced GeoEnvironmental, Inc. (AGE May 4, 2006) <br /> included the installation of four onsite monitoring wells in the storage and bulking area and five <br /> onsite monitoring wells adjacent to the former underground storage tanks close to the Highway <br /> 99 Frontage Road. Interpretation of the boring logs from the installation of these wells indicates <br /> that the subsurface material consists primarily of silty sand and sandy silt. <br /> SCOPE OF WORK <br /> The specific tasks that will be conducted as part of this Work Plan include: <br /> • Task 1 -- Pre-field activities <br /> • Task 2 -- Monitoring Well Installation <br /> • Task 3 -- Well Development and Groundwater Sampling <br /> • Task 4 -- Surveying <br /> • Task 5 -- Disposal of Investigation-Derived Wastes <br /> • Task 6 -- Site Investigation Report <br />