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I I I �I DeBoer Truck Lines, Inc. 201 ff"est 51h Street, Ripon, California ,I Phase I Report of Findings I U 1.0 Project Identification This project involves the installation of monitoring wells to determine-if the petroleumi product released from the former underground tanks has impacted groundwater at 201; West 5th Street in Ripon, California (Figure 1). This project phase also provides" {' groundwater gradient information for future investigative work. '-" 2.0 Site Description and Historp On October 21, 1992, SEMCO, under permit, removed two (2) underground fuel storage!; �-• tanks from the DeBoer Trucking property. The tanks included a 6,000 gallon diesel tank, and an 8,000 gallon diesel tank. The soil samples taken under the diesel tanks disclosed concentrations of petroleum hydrocarbon in the diesel range. Fes, On January 15, 1993, SEMCO re-excavated the former underground tank facility at DeBoer Trucking. WET Iogged the excavation and screened the soil with a portable PID. Highly contaminated soils were encounterCd during the excavation, and did not appear to -4 decrease much with depth. The excavation was terminated at 25 feet in depth, and samples were taken of the floor and sidealalls at 18 feet in depth (Figure 2). II I� The lateral limits of the excavation were forty feet from north to south, and twelve feet from east to west. Approximately 440 cubic yards of soil were removed and stockpiled on '! i l site. Soil samples taken for laboratory analysis of the side walls and the floor of the -� excavation had varying levels of BTX&E and Diesel, i a Sample LD. Benzene Toluene EthylBenzene X letres Gasoline Dlese! U BH-25' 53 ND 1 191 pWkg 315pg/kgND 4 100 m (� NW-1T ND ND ND 56 pgtk& ND 200 m gfkg EW-1 Ni) ND 5,300 AgAg 21,000 pglkg ND 19,000 mg/kg ww-1 R' 53 ND 150 490 ND 1,500 mg/kg SW-1 1' 48.5 11:3 ND 5.9 ND 5.9 mglkgI ND=non detect it I� 1 .I