Laserfiche WebLink
CLOSURE REPORT FOR UNDERGROUND STORAGE TANK 836-D1U1 <br /> SUMMARY OF LABORATORY ANALYTICAL RESULTS: (Continued) <br /> Sample Identification Analyte EPA Method Sample Concentration <br /> (Matrix) Number <br /> 5. TK02-879-D1U1-01-SP-AS Gross Alnha/Beta {Radiological Analytical ND/ND <br /> Tritium Method Numbers ND <br /> Gamma Soectroscoov Not Specified) Gamma atroscogy <br /> Potassium-40 6.8E-06±0.72E-06µCi/mLgm <br /> Ra-226 2.9E-07±0.40E-07gCi/mLgm <br /> Ra-228 3.2E-07±0.81E-07gCi/mLgm <br /> Th-228 4.0E-07±0.04E-07gCi/mLgm <br /> 6. TK03-879-D1U1-01-SP-SO Gross Alpha (Radiological Analytical 2.4E-06±1.68E-06µCi/mLgm <br /> Gross Beta Method Numbers ND <br /> Tritium Not Specified) ND <br /> Gamma Snectrosconv Gamma Spectrosconv <br /> Potassium-40 9.5E-06± 0.93E-06µCi/mLgm <br /> Ra-226 3.8E-07± 0.46E-07gCi/mLgm <br /> Ra-228 4.9E-07± 0.99E-07gCi/mLgm <br /> Th-228 4.6E-07±0.49E-07gCi/mLgm <br /> NOTE: <br /> mg/Kg=milligrams per Kilogram <br /> µCi/mLgm=microCuries per milliliter-gram <br /> ppm=parts per million <br /> ND=Not detected above laboratory detection limits <br /> [X] Laboratory analytical results and chain of custody records for the environmental <br /> sample(s)enclosed as Appendix E. <br /> PERSONAL PROTECTION EQUIPMENT(PPE)DISPOSAL: <br /> [X] Not Applicable. (Used PPE did not require special handling or disposal) <br /> The PPE was transported by: N/A <br /> The PPE was disposed of as: N/A Date: N/A <br /> Name and address of disposal facility: N/A <br /> [N/A] LLNL Hazardous Waste Requisition and Uniform Hazardous Waste Manifest"TSD <br /> Facility to Generator"copy for the used PPE enclosed. <br /> CLOSURE REPORT CONCLUSIONS: <br /> • UST 836-DlU1 was closed according, to the Closure Plan approved by the San Joaquin <br /> County Public Health Services. <br /> • On March 11, 1994,the tank system was closed and the tank was removed from the ground. <br /> Soil samples collected from within the excavation and from the soil removed from the <br /> excavation were submitted for analyses of diesel fuel(TPH-D)and BTEX. On Friday,March 18, <br /> we received the results of analyses of these samples. The sample collected within the <br /> excavation at a depth of 132 inches below the surface showed 69 mg/kg for TPH-D,and "ND" <br /> for all four BTEX analytes. The sample collected from the pile of excavated soil and fill showed <br /> 1,400 mg/kg of TPH-D. BTEX analyses showed ND for Benzene, 0.0062 mg/kg for Toluene, <br /> 0.13 mg/kg for Xylenes,and 0.015 mg/k for r Ethylbenzene. <br /> • On March 18,PetroTek performed a pressure test on the Wiping. All underground portions <br /> of the su1212ly 12ii2ing,the return piping,and the vent piping were pressurized with forty to fifty <br /> pounds12er square inch of air pressure for thirty minutes. The test showed that the supply <br /> pining is leak tight The test also showed that the return piping and the vent piping do not hold <br /> air pressure The leak was detected to be in the return line joint The excavation of soil to <br /> expose the return line showed no evidence of soil contamination Mr.Snavely specified the <br /> Sample location and witnessed sampling from beneath the Wiping run. The sample was <br /> collected on March 30 1994 for TPH-D and BTXE analysis and resulted in ND. <br /> • The stockpile has not been remediated and is currently awaiting proper disposal or reuse <br /> • At this time,LLNL does not plan any further action for this tank closure. <br /> 5 <br />