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and 0 026 mg/kg Hydrocarbon concentrations in the five remaining soil samples were reported as nondetertable (N D ) at detection levels as follows • Benzene 005 mg/kg • Toluene, Ethylbenzene, Xylene and Ethyldibromide 010 mg/kg v Organic Lead 4 mg/kg TPH gasoline and diesel 10 mg/kg The data sheets for the analytical results are contained in Appendix B 1.3 Site Description The DPC Facility is an agricultural grain processing and packaging plant, nine acres in size and located on the northeast edge of the city of Tracy, California As shown in Figure 2, the investigation location is in the central part of the property in an oven area between two warehouses and the plant The excavation is located adjacent to an unused restroom facility The land adjacent to the DPC property to the west and north is residential develop*nente Other surrounding pr perties are commercial and industrial development-3 A former Mobil Oil Distr.bution Center is located to east of the site at 500 East Grantline Road Local groundwater gradient information was obtained from four wells located cr this property The site lies within 1,000 feet of the DPC Inver'Lgatior site A groundwater gradient of approximately north 181 west was calculated from data obtained from a report on monitoring of the four wells on file • at San Joaquin C'uLuL4;-, Public Health Services The Aevation of the site is 35 feet above mean sea level with a slight surface gradient to the northwest. The Tracy Public Works Department estabhshed the groundwater at 10-13 feet at this Iocation Measurements at the time of UST removal indicated that the depth to water was approximately 12 feet DPC had two septic systems immediately north of the tank site The septic tanks are still in place, but not connected to the plant sewer system and are not in use The yard's restroom is currently plumbed to the -nain plant with water and sewer service buried to the north of the building Currently, the larger excavation pit is partially backfilled and is overgrown with weeds The excavation pit remains approximately four feet deep and luruts the ability to use a truck mounted rig within the excavation Soils removed during the UST excavation are stockpiled in a location as shown on Figure 2 and are both underlain and covered with plastic The yard is surfaced with 10-12 inches of asphalt 3 • BRUNSING ASSOCIATFS, INC ® �� �g