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1 <br /> The removed tanks were inspected by personnel from the San Joaquin County PHS/EHD and <br /> were found to be in good condition with no holes However, soil staining and product odor were <br /> observed adjacent to the fourth and fifth USTs (easternmost) At least two soil samples were <br /> collected from beneath each of the former USTs and two soil samples were collected beneath the <br /> removed product piping The locations and depth of the soil samples and analytical results are <br /> presented on Figure 2 Results of the soil sample analyses indicated that soil beneath the north <br /> ' end of the fourth UST (second from the east) contained up to 7,600 parts per million (ppm) of <br /> Total Extractable Hydrocarbons (THE)-as-diesel and that soil beneath the western-most UST <br /> ' contained up to 180 ppm of THE-as diesel Benzene was not detected in any of the 13 soil <br /> samples collected from the excavation floor Groundwater was not encountered during <br /> excavation <br /> ' The waste soil was stockpiled and sampled Results of the stockpile soil samples indicate that <br /> the soil contained up to 690 ppm TPH-as-diesel A total of 317 tons of waste soil was disposed <br /> of by Ramcon at Forward Landfill in Manteca, California The excavation pit had been <br /> backfilled with clean imported soil and resurfaced with sodgrass <br /> 3.0 Scope of Work <br /> The objectives of tlus investigation were to determine the vertical extent of impacted soil in the <br /> 1 former UST area, to determine if groundwater has been impacted by petroleum hydrocarbons and <br /> to define the extent of impacted groundwater, if necessary To achieve the project objectives, a <br /> ' scope of work was implemented in accordance with the April 21, 1997 Workplan prepared by IT <br /> and approved by the San Joaquin County Environmental Health Division on April 29, 1997 The <br /> project scope of work consisted of four tasks <br /> ' 3.1 Planning and Permitting <br /> The planning and permitting task consisted of a preliminary site inspection, the preparation of a <br /> ' health and safety plan, and acquisition of the required permits <br /> ' SAC/08-29-97/ENGn71744 3 <br />