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\► %N/ Mr. Hunt <br /> September 20, 1991 <br /> Page 3 <br /> SEP 2 6 IM <br /> ENV IPON"`4t +; 1A 1- HEALTH <br /> Soil Analytical Results { . ' ';!!l/5E <`f Cc <br /> Soil samples SCK-1, SCK-2, and SCK-3 had no detectable TPH and BTEX concentrations. <br /> Analytical detection limits were 10.0 milligrams per kilogram(mg/kg) for TPH, 1.0 micrograms <br /> per kilogram (µg/kg) for benzene, toluene, and ethylbenzene, and 3.0 µg/kg for xylene. Soil <br /> analytical results are presented as Attachment 3. <br /> TANK DISPOSAL <br /> The tank was inserted with dry ice, plugged with a 1,000 pounds-per-square-inch (psi) pressure <br /> valve,and transported under Uniform Hazardous Waste Manifest#90546561 (Attachment 4)by <br /> H&H Ship Service Company (H&H) of San Francisco, California. The tank was steam-cleaned <br /> at the H&H facility and the rinsate was collected and treated. H&H is a licensed treatment and <br /> disposal facility (License No. CAD 004771168). H&H issued a Certificate of Disposal for the <br /> Stockton ATCT facility tank on August 16, 1991 (Attachment 5). <br /> GROUNDWATER DISCUSSION <br /> No groundwater was observed in the tank pit during excavation, tank removal, and soil <br /> sampling activities. The site is less than one mile north of Lone Pine Creek and less than seven <br /> miles east of the San Joaquin River on relatively flat topography. Groundwater is probably less <br /> than 50 feet below ground surface. <br /> CONCLUSION <br /> A 1,000-gallon-capacity diesel tank was removed by the FAA on August 13, 1991 under a permit <br /> issued by the SJCPHS. Upon excavation,the tank appeared intact with no visible leaks or holes. <br /> ASI field personnel observed no soil staining and detected no hydrocarbon odors in the soil <br /> adjacent to or beneath the tank In addition, soil samples collected beneath the tank had no <br /> detectable TPH and BTEX concentrations. Based upon the field observations and test results <br /> presented in this report,the 1,000-gallon-capacity diesel tank appears to have been intact during <br /> excavation with no known past leakage. The surrounding soil does not appear to have been <br /> degraded with diesel from the tank. On behalf of the FAA, the closure of the facility is <br /> requested from the SJCPHS. <br /> fv/��on.kr/�1 <br />