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'Mr Michael Collins <br /> September 3, 1993 <br /> Page 4 <br /> and depths will be determined in the field ,jointly by BC and County of San Joaquin, <br /> Department of Environmental Health (County) personnel Samples will be analyzed for <br /> TPH-G, TPH-D, TPH-MO, and BETX by an analytical laboratory certified by the State of <br /> California <br /> Prior to backfilling, the base of the excavation should be lined with approximately two feet <br /> of a low permeability clay and five feet of clean imported soil The remainder of the <br /> excavation should then be backfilled with the materials currently stockpiled on-site BC will <br /> 1 collect three composite samples, at locations approved by the County, from the stockpiled <br /> matena�su�mit -these s'�ai�n ples will be analyzed for <br /> soluble threshold limit concentration (STLC) of TPH-G and TPH-D confirm that petroleum <br /> pro s c are o eac a e po irmation of the leachability of the <br /> soil, the site will then be returned to its original condition by backfilling and compacting the <br /> excavation with on-site material to,just below ground level, then re-asphalting the entire area ,� l <br /> to meet existing grade 17YX <br /> 1� <br /> E BC also recommends installing three groundwater monitoring wells to monitor the shallow /001 <br /> water-beanng unit for the presence of TPH-G and TPH-D The three groundwater wells will <br /> ! be installed to approximately 100 feet below ground level and monitored on a quarterly basis <br /> for a period not to exceed two years If analytical result indicate nondetectable concentration <br /> of TPH-G and TPH-D in groundwater for a period of four consecutive quarters prior to the <br /> end of the two year monitoring period, the monitoring program will be discontinued at that <br /> time <br /> If you have any questions regarding this status report, please call me at (916) 444-0123 <br /> Sincerely, <br /> BROWN AND CALDWELL <br /> pj'y d,#,jk f s <br /> Pat G Cullen I b i <br /> Project Manager ,9dr <br /> PGC TM lk � D <br /> Enclosure .Q <br /> 1 � 14 <br /> cc Ms Tina Bauer, Brown and Caldwell <br /> Mr Bob Fratto, Sheldon Oil Ups{/ <br /> Mr Les Smith, Kause Construction <br /> Mr James WOodard, Sheldon Oil <br /> Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this <br /> document <br /> Brown and Caldwell 7603\CORRESPA7603 02 L 1 <br /> Consultants <br />