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r; ! <br /> Woodward-Cle (� <br /> Ms. Diane I mson i 1 <br /> San Joaquin County Environmental Health Division J <br /> February 23, 1996 <br /> Page 3 j <br /> during tank removal activities may be allowing surface water to accumulate in the tank excavation. 11 <br /> This water might potentially leach contaminants to the deeper aquifer. WCFS recommends the ;y <br /> following: <br /> • Re-excavation of the existing backfilled UST pit i <br /> • Removal of the polyethylene liner <br /> • Excavation of additional contaminated soil <br /> • Backfilling of the excavation and restoration of the site <br /> PROPOSED SCOPE OF WORK ! <br /> i <br /> WCFS proposes the following field activities at the KJAX Radio Transmitter site in Stockton, <br /> California: it <br /> Task 1 Re-excavate the former UST pit location using a <br /> track-mounted excavator backhoe and remove the !I <br /> polyethylene liner. Excavate the remaining diesel- <br /> contaminated soil at 18 to 22 feet bgs. <br /> Task 2 Collect two soil samples to confirm the removal of <br /> all diesel-contaminated soil and analyze for TPH as diesel <br /> and for BTEX. <br /> Task 3 Backfill the excavation using the clean backfill material <br /> removed during the re-excavation activities and <br /> imported material. !! <br /> Task 4 Load,transport, and dispose of excavated diesel <br /> contaminated soil at Forward Incorporated Landfill of <br /> Stockton, California. <br /> I <br /> Task 5 Prepare a tank closure report describing re-excavation li <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 I <br /> 8054z:\continv.ust\kjax.ca\reports\wkpin.jax <br /> �� i <br />