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F1 FAptil 18, 2005 NOA Project Number: E05008B - No'ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. during the drilling of the percolation test holes to a-depth of three and a-half feet on February 23, 2005. ' - 4.2 -Potential Ground Water Contamination Issues Identifying potential ground-water-contamination sources was not part of the scope of work for-the soil suitability study. A.Surface and Subsurface Contamination Report addressed this issue (NOA, 2003). Please refer to this report for descriptions. Potential ground-water contamination can occur.from a number of sources which often include -- leaky underground storage tanks, agricultural activities, dairies,.septic systems, and storm water infiltration. Any past agricultural activities and the present use of septic systems in the area should III be considered potential ground-water contamination sources. In the Tracy area, the 448-acre Tracy Defense Depot site was an Army Supply Depot from 1942 to 1963 when it was turned over to the Defense Logistics Agency is a source of potential groundwater _ i contamination. Operations at the facility included repacking leaking chemical containers, fumigating shipping materials,maintaining vehicles,painting, storing chemicals,preserving metal parts, o crating chemical andphotographic laboratories, storingand mixing pesticides, and storing and trea.ting liquid and solid wastes. Currently, all solid hazardous waste is hauled off site to Federally- approved disposal facilities. The shallow aquifer below the site is contaminated with volatile organic F1compounds (VOCs);i.e.,TCE,PCE and DCE. (U.S. EPA, 2005) 4.3 Water Sample Location _ F1 Noermits were found for the subject property address of 25122 South Banta Road. p 40 There are no operable wells on the subject property so no water sample was taken. F ,A# 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION -� The Site is depicted on the Preliminary-Geologic Ma of the San Francisco - San Jose Cenozoic .r P �Y-. � p Deposits of the Tracy Quadrangle, California (1981), as within a region of Quaternary Fan deposits. - The unit is one of gravel, sand silt and clay (Plate 3). The surface and near surface-soils.located at the Site are.reported by the San Joaquin County Soil Survey Fi 016 ' to be composed of the Capay clay, 0-2% slopes 'El Solyo clay loam, 0-2% slopes, and the Vernalis clay loam, 0-2% slopes (Plate 4) (USDA, 1992). Table 3 presents some selected properties of the soils: 5