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CONCLUSIONS <br /> The analytical results of the soil sample collected beneath UST 830-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 /> A"real �: Saft <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 830-D1 U1 tank system showed levels of <br /> TPH as Diesel and BTEX, that exceed the Practical Quantitation Reporting Limits in the <br /> TRBSR. It was determined by Bill Snavely in a telephone conversation with Rick Henry on <br /> October 20, 1993 (Appendix F), that the soil beneath the former UST 830-D1 U1 could be left <br /> in place, and the excavation could be backfilled. Mr. Snavely applied the Leaching Potential <br /> Analysis in the Leaking Underground Fuel Tank Field Manual, dated October 1989, to the <br /> soil sample analytical results and the hydrogeology in the area of the tank excavation. The <br /> soil pile containing soil from above the tank, see Figure 3 (Appendix A) showed no <br /> detectable levels of Total Petroleum Hydrocarbons as Diesel Fuel, and shall be used to <br /> backfill the UST 830-D1 U1 excavation. The soil pile containing soil from beneath the tank, <br /> see Figure 3 (Appendix A) showed 4,700 ppm of Total Petroleum Hydrocarbons as Diesel <br /> Fuel, and shall be bioremediated on site at the Building 843 Environmental Corporation <br /> Yard or disposed of at the appropriate facility. The LLNL requests that the PHS-EHD grant a <br /> conditional case closure for the 830-D1 U1 tank system. A State Water Resources Control <br /> Board UST Permit Application Form B shall be submitted to the PHS-EHD within 30 days of <br /> the submittal of this closure report. <br /> UST 830 CLOSURE REPORT <br /> -3- <br />