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l <br /> f, the ends of each leaded gasoline UST, and one sample from beneath the fill end of the diesel <br /> 4_= UST immediately subsequent to removal. All samples were retrieved from the floor of the <br /> excavation at 13.5 feet below surface grade (bsg). Additionally, two soil samples were collected <br /> from the soil stockpile flanking the excavation. The stockpile was moved to the south end of <br /> the property prior to backfill of the excavation in May, 1994. <br /> Analytical results of the soil samples revealed that elevated levels of Total Purgeable <br /> Hydrocarbons as gasoline (TPH-g) and total extractable petroleum hydrocarbons as diesel <br /> (TEPH-d), volatile aromatics benzene, toluene, ethylbenzene, xylenes (BTEX), and lead were <br /> present in the samples collected from the excavation and from the stockpile. <br /> The overexcavation of the former tank pit was initiated on July 16, 1993 by equipment operator <br /> Mark Burns and a W.W. Irwin, Inc. staff geologist as requested and contracted by the Pegasus <br /> Group. The work was periodically supervised by Mr. Michael Collins, SJCPHS EHD <br /> Registered Environmental Health Specialist. As the excavation proceeded, soil samples were <br /> collected for lithologic analysis and organic vapor analysis (OVA) meter readings were taken <br /> in order to direct the excavation by determining the level of contamination and the direction of <br /> >_ migration. The excavation was expanded slightly in all directions from the original tank pit to <br /> an area approximately 35 square feet and to a depth of approximately 18 to 20 feet below <br /> - surface grade (bsg). The excavation was halted when the excavator reached the limits of its <br /> extension and the northern wall became inaccessible. Ground water was not encountered. <br /> An estimated 260 cubic yards of newly-excavated soil was removed from the tank pit and stored <br /> =� at a location on the south side of the property, and separately from soil stockpiled during the <br /> tank removal operation. Upon completion of the excavation activities, two bottom- and four <br /> side-wall samples were gathered in the excavator bucket as directed by Specialist Collins. The <br /> soil samples were then retrieved from the bucket of the excavator by driving a clean hand- <br /> sampler containing a sterile, two-inch diameter, six-inch stainless steel tube into the gathered <br /> :.j soil. The sample tube was immediately sealed with Teflon' tape, capped, taped, labeled, and <br /> I_ `I placed on ice in a cooler for transport to a California Department of Health Services-certified <br /> laboratory for analysis. Appropriate chain-of-custody procedures were followed during sample <br /> handling. <br /> Each sample was analyzed for TPH-g by EPA Method 8015, BTEX analytes by EPA Method <br /> 8020, and organic lead per the California Leaking Underground Fuel Tank manual (State Water <br /> Resources Board, 1989). The analytical results are listed in Table 1. <br /> J <br /> W.W. Irwin, Inc. <br /> `1 Project No. 33016.06 <br /> April 1996 2 <br />