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J. H. KLEINFELDER & ASSOCIATES File: W-2022-1/11:312 June 19, 1986 Page 6 Development of a water supply from sources on the northeast edge of the site would involve pumping and distribution costs to supply the entire community. The U.S.G.S. topography map, Tracy Quadrangle, indicates an elevation gain Of up to approximately 1,000 feet from the northeastern border to the southwest corner of the site. In addition, if sufficient quantities of good quality water are not encountered, it may be necessary to develop water treatment facilities to bring the water within the State standards. Completion depths of Carnegie wells and are shown in Table 1. Current information on depth to water in these wells is not available at this time. Historically, nearby area wells of approximately the same elevation as the soil borings at Corral Hollow Landfill show depths to static water at 151 to 255 feet, with water bearing zones initially being encountered at approximately 260 feet. B. Geologic Information from the Musco Olive Investigation A number of studies have been performed at the Musco Olive facility, located west of Interstate 580 off Patterson Pass Road in San Joaquin County. This site is located approximately 5 miles northwest of the Corral Hollow Landfill. In the investigation performed for Musco Olive, soil borings were drilled to a depth from 50 to 90 feet below existing ground surface. The location of these borings are shown in Plate 4. The boring logs from this investigation are included in Appendix B. The following discussion is taken from a June ?, 1985 correspondence in reference to the Musco Olive investigation: Soil borings were drilled on May 1, 13, and 14, 1985 using a truck -mounted drill rig equipped with 6 -inch diameter continuous flight auger. Occasional soil samples were obtained by pounding a split spoon sampler into the soils using a 140 -pound hammer falling approximately 18 inches. In general, the soil conditions encountered in the these boreholes consisted of approximately 2 to 4 feet of dark -brown sandy silty clay at the surface overlying mixtures of clayey sand and silt soils that extended to depths varying from approximately 16 to 26 feet below - existing ground surface. Below these depths, with the exceptions of minor sandy and gravelly lenses the predominate soil consisted of light tan -grey silty sandy clay extending to the maximum depth explored of from 50 to 90 feet below existing ground surface.