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CONCLUSIONS <br /> The analytical results of the soil sample collected beneath UST 814-D1 U1 were evaluated <br /> by LLNL EPD Tank Representative, Mr. Rick Henry, and compared to the Practical <br /> Quantitation Reporting Limits in the Regional Water Quality Control Board's Tri-Regional <br /> Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground <br /> Tank Sites(TRBSR), dated August 10, 1990, below: <br /> nl S©iilP <br /> P.,r <br /> ... ..... .. <br /> Total Petroleum <br /> Hydrocarbons as 1.0 <br /> Diesel <br /> Ethyl benzene 0.005 <br /> Benzene 0.005 <br /> Toluene 0.005 <br /> Xylene 0.005 <br /> Based upon the analytical laboratory results of the soil sample collected from the tank <br /> excavation, it was determined that soil beneath the 814-D1 U1 tank system showed levels of <br /> TPH as Diesel and BTEX, below the Practical Quantitation Reporting Limits in the TRBSR. <br /> LLNL shall backfill the lower two-thirds of the tank excavation with clean fill material. <br /> Excavated backfill material from UST 814-DlU1 tank removal activities showed 160 ppm of <br /> TPH as Diesel, and shall be used to backfill the top 3-4 feet of the UST 814-D1 U1 <br /> excavation. Any remaining backfill from UST 814-D1 U1 tank removal activities shall be <br /> bioremediated on site at the Building 843 Environmental Corporation Yard or disposed of at <br /> the appropriate facility. The LLNL requests that the PHS-EHD grant a conditional case <br /> closure for the 814-D1 U1 tank system. A State Water Resources Control Board UST Permit <br /> Application Form B shall be submitted to the PHS-EHD within 30 days of the submittal of this <br /> closure report. <br /> UST 814 CLOSURE REPORT <br /> -3- <br />