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FPON Ground Zero Pnalysis PHONE NO. 209 952 9692 Sep. 30 1996 04:36PN F4 Roy's Towing � Page 3 Hydrogeolo ical Setting The site is located in the east central portion of Stockton, at the southeast corner of Miner Avenue and State Highway 99, in a mixed light industrial and residential area. The elevation of the site is approximately 26 feet above sea level, The ground surface in this area generally slopes gently to the west at about 5 feet per mile. As described by Kaldveer, the surface soilat the site consists of dark brown to black, organic rich clay from the surface to a depth of approximately 2-3 feet. Underlying this unit is a brown silty clay/clayey silt to a depth of approximately 7-8 feet. Beneath the brown clay, a red-orange silt is present to 10 feet, the maximum depth explored. The nearest surface water bodies are ephemeral and include the Stockton Diverting Canal, located a little less than one mile.to the northeast and Mormon Slough, located about 6,000 feet to the south. Based on published data, the current depth to groundwater beneath the site is estimated to be approximately 65 feet. Historical high groundwater (Spring. 1986) is estimated to have been about 50 feet below grade. Groundwater flow in the site vicinity is expected to be generally easterly towards a large pumping depression on the east side of Stockton. PPrr posed Scold of Work In order to comply with the order of the Court, Ground Zero proposes to investigate the condition of soils on the property by focusing primarily on areas suspected of contamination as a result of the DHS and Kaldveer sampling. In addition, limited random sampling will be conducted. The proposed sampling locations are depicted on Figure 2. Proposed sampling locations "A" and "B" will focus on the area near the office/warehouse building and former workshop (Kaldveer "Area I"). Sampling location "C" will be located near the southeast corner of the office building and Kaldveer's "Area II". These locations are also within the area identified by the DHS has having evidence of soil staining. Soil samples will be collected at depths of 1 foot and 5 feet below grade. Sampling location "D", near the southeast corner of the property, will investigate the limits of of the Kaldveer "Area ill" as shown on Figure 2. Soil samples will be collected at depths of 1 foot and 5 feet below grade. The small sump inside the building will be investigated by a hand auger boring indentified on Figure 2 as location "E". Soil samples will be collected at depths of 1 foot and 5 feet below the bottom of the sump. atnaulmomkay.�rp