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' 3.5.1 Phase I ExcavAon, August 30 - 31, 1993 Soil was excavated to a depth of 30 feet, removing approximately 1,000 cubic yards of soil from the former UST site Most of the soil samples collected were uncontaminated, however, one sample from the floor (sample Bi-32) and two samples from the west wall ' (samples W-26 and W-29)contained trace concentrations of petroleum hydrocarbons (Table 8) ' 3.5.2 Phase II Excavation, September 21, 1993 During the second phase, the excavation was deepened to a total depth of 39 feet No ' petroleum hydrocarbons were detected in soil samples collected from the west wall of the excavation during this phase Only sample 135-39, collected from the floor of the excavation ' at a depth of 39 feet, had any detectable hydrocarbons Benzene and toluene were detected at 0 006 ppm and 0 007 ppm, respectively The detected levels of benzene and toluene are slightly above the 0 005 ppm detection limits for these compounds t3.5.3 Collection of Soil Samples from Clean Stockpiled Soil, October 1993 Soil from the "clean" soil piles was sampled on October 6, 1993 Eight samples were collected from the stockpiled soil under the direction of Ms Meays The samples were composited by the laboratory into four samples No contamination was detected in the any of the samples collected from the "clean" soil piles 3.5.4 Characterization and Disposal of Contaminated Stockpiled Soil, October 1993 IIt is our understanding that on October 22, 1993, twenty samples were collected from the "contaminated" soil pile by NPI Samples were obtained by hand augenng to a depth of 15 feet, using a hand-driven metric soil sampler containing 2 x 6-inch brass sleeves The samples were transported under chain-of-custody by NPI to Sparger Technology, Inc , a state- certified laboratory The twenty samples were composited by the laboratory into five samples for analysis The eomposrted samples were each analyzed for TPH as gasoline, BTE&X, and total lead Analytical results were included in the January 1994 Quarterly Report prepared by GeoAudrt Upon completion of the soil characterization, the soil was transported on December 1, 1993, by R Bauerle Trucking to B&J Landfill, Inc in Vacaville, California under Non-hazardous Waste Manifest. Copies of the manifests were included in the January 1994 Quarterly Report prepared by GeoAudit o..r.S.i Audit 3.t I— Wa ai R-.w CM mom I