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-max <br /> DeBoer Family Trust , <br /> 201 West 5th Street, Ripon, California : <br /> Soil/Groundwater Remediation Workplan <br /> ..� .1 l.f N 2 3 1,3 <br /> ENVIRONMENTAL HEALTH <br /> PERMITISERVICES <br /> 1.0 Project Identification <br /> This project involves the excavation of contaminated soils and groundwater due to <br /> 't <br /> petroleum product released from the former underground tanks at 201 West 5th Street in <br /> Ripon, California (Figure 1). Treatment of the soil and groundwater contamination will `k <br /> continue until the contamination is reduced to appropriate levels. The treatment of the <br /> soils will be by bio-remediation and groundwater treatment will be by storage and carbon ; <br /> y, canisters as required. <br /> 2.0 Site History I <br /> On October 21, 1992, SEMCO, under permit, removed two (2) underground fuel storage <br /> tanks from the DeBoer property. The tanks included a 6,000 gallon diesel tank, and an i` <br /> 5,000 gallon diesel tank. The soil samples taken under the diesel tanks disclosed <br /> concentrations of petroleum hydrocarbon in the diesel range. <br /> if <br /> On January 15, 1993, 'SEMCO re-excavated the former underground tank facility at the <br /> r DeBoer property. WI-IF logged the excavation and screened the soil with a portable PID. <br /> Highly contaminated soils were encountered during the excavation, and did not appear to <br /> decrease much with depth. The excavation was terminated at 25 feet in depth, and <br /> samples were taken of the floor and sidewalls at 18 feet in depth(Figure 2). <br /> The lateral limits of the excavation were forty feet from north to south, and twelve feet <br /> from east to west. Approximately 440 cubic yards of soil were removed and stockpiled on <br /> site. Soil samples taken for laboratory analysis of the side walls and the floor of the <br /> excavation had varying levels of BTX&E and Diesel, see Table 1 attached. <br /> b <br /> On June 30, 1994, WIHF, Inc. drilled three (3) soil borings and complete each as; <br /> Ii <br /> groundwater monitoring well. The wells are located in the area of the former{ <br /> underground tanks (Figure 2) and were used to determine the groundwater gradient and <br /> help in the definition of soil and groundwater contamination, see Figures 3 through 8;, <br /> attached. <br /> Laboratory soil samples were taken from all borings at five foot intervals including the <br /> II` <br />