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SITE CONTAMINATION WORK PLAN HOTCHKISS MORTUARY 5 West Highland Avenue Tracy,California 1.0 INTRODUCTION This work plan has been prepared by Upgradient Environmental Consultants on behalf of Hotchkiss Mortuary under contract #97012. The purpose of the work plan is to specify the equipment and procedures that will be used to investigate the subsurface extent of gasoline hydrocarbons in the soil and/or groundwater beneath the mortuary property located at 5 W. Highland Ave. in Tracy (Figure 1). The investigation was requested by the San Joaquin County Public Health Services Agency, Environmental Health Division (PHS/EHD), in written communication to Hotchkiss Mortuary on April 17, 1997. Under the authority of the Central Valley Regional Water Quality Control Board, regulatory oversight for the investigation has been assigned to PHS/EHD and the site has been placed in its Local Oversight Program. 2.0 BACKGROUND It is our understanding that a 525-gallon underground storage tank(UST) was removed on June 19, 1990 from the Hotchkiss Mortuary property (Figure 2). The mortuary used the UST to store gasoline for company vehicles. The removal was performed by Crisp Tank Testing and witnessed by personnel from PHS/EHD and the Tracy Rural Fire Department. One soil sample was collected and analyzed by FGL Environmental Laboratories for total petroleum hydrocarbons as gasoline (TPH-g), ethylene dibromide (EDB), organic lead (Pb), and benzene, toluene, ethylbenzene, and xylene (BTEX). Neither EDB nor Pb were detected, but TPH-g was detected at a concentration of 300 mg/kg and BTEX compounds were detected at up to 3 mg/kg. The property was therefore placed on the county's contaminated site list,but no further investigation was requested at that time. The excavation was backfilled and the UST was not replaced. PHS/EHD has now directed Hotchkiss Mortuary to submit a work plan to investigate the extent of the contamination that was detected in 1990. The proposed scope of work is described in the next section. 3.0 SCOPE OF WORK Hotchkiss Mortuary proposes to drill a boring through the former tank cavity to the soil-water interface. The depth to water is presently estimated to be between 8 and 15 feet. A gasoline- powered Beaver post-hole digger equipped with 3-inch-diameter hollow-stem augers will be used. Soil samples will be collected through the augers in a stainless-steel sleeve sampler lined with 2- foot-long clear plastic liners. Samples will be collected at 5-foot intervals, beginning at 5 feet, until groundwater is reached. A groundwater sample will be collected by lowering a plastic bailer