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Woodward-Clyde `l <br /> Ms. Diane ITinson <br /> San Joaquin County Environmental Health Division _-- <br /> February 23, 1996 <br /> Page 3 = - <br /> during tank removal activities may be allowing surface water to accumulate in the tank excavation. <br /> This water might potentially leach contaminants to the deeper aquifer. WCFS recommends the <br /> following: <br /> Re-excavation of the existing backfilled UST pit <br /> Removal of the polyethylene liner <br /> • Excavation of additional contaminated soil _ II <br /> • Backfilling of the excavation and-restoration of the site =- <br /> PROPOSED SCOPE OF WORK <br /> WCFS proposes the following field activities ..at the-KJAX Radio Transmitter site in Stockton,!. <br /> California: <br /> Task 1 Re-excavate the former UST:pit�location using a <br /> track-mounted excavator backhoe and remove the <br /> polyethylene liner. Excavate-the remaining diesel=" - <br /> contaminated soil at 18 to 22 feetbgs. <br /> Task 2 Collect two soil samples to confirm the removal of <br /> r all diesel-contaminated soil and analyze for TPH.as diesel; <br /> and forBTEX. <br /> Task 3 Backfill the excavation using the clean backfill material - <br /> removed during the re-excavation activities and <br /> imported material LL <br /> Task 4 Load,transport, and dispose of excavated diesel _ <br /> contaminated soil at Forward Incorporated Landfill of .T - <br /> Stockton; California. <br /> Task 5. Prepare a tank closure report describing re-excavation <br /> activities and confirmatory sampling results. <br /> Task 1 -Excavation <br /> WCFS proposes to retain a licensed contractor to complete excavation activities. Initially WCFS will <br /> Woodward-Clyde Federal Services <br /> �� 8054z:\continv.ust\kjax.ca\reports\wkpin.jax <br />