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_ r aWOM 1, Work Plan for Re-excavation May 3, 1989 Former Texaco Service Station, Manteca, California AGS 3a053--1 The following tasks are proposed and discussed below: a Prepare a site safety plan discussing the precautions and protective equipment required for work at the site. o Remove the underground product-delivery lines presently located at the sitL. This work will be performed by a Class A licensed contractor. o Collect still samples from native soil beneath the location of the former underground product-delivery linos. a Remove soil with subjective evidence of hydrocarbon contamination (i.e. , discoloration and obvious odor) from the former location of the underground storage tanks and possibly the underground product-delivery lines with an excavator both vertically to the ground- water surface and laterally to the north, east, and west. Excavation to the east and west will be limited because of the presence of a sanitary sewer line and the site building. o Use an organic vapor monitor (OVM) to evaluate the relative levels of hydrocarbon contamination in the soil. o Collect a soil sample from each sidewall at approximately 20 feet below grade, or approximately 3 feet above the ground-water level. o Analyze the soil samples for gasoline and diesel constituents in a State-certified laboratory. o Interpret field and laboratory data to evaluate the extent of contamination. o Collect one soil sample for approximately every 25 cubic yards of soil removed by excavation from the stockpiled soil. o Upon characterizing the concentrations of hydrocarbon constituents in the stockpiled soil, the contaminated soil will be disposed of properly or treated by aeration, landfarming, or some other method appropriate to the contaminants to remediate contamination in the soil. After treatment concentrations established by 8 Q.0�e�e