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I 1' 3.5.3 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 i 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 I 3.5.4 Characterization and Disposal of Contaminated Stockpiled Soil, October 1993 It is our understanding that on October 22, 1993, twenty samples were collected from the ' " a depth of 1 5 contaminated" soil pile by NPI Samples were obtained by hand augering to j 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 ' composited 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 ' GeoAudit 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 4.0 SITE CLOSURE -4.1 Hydrocarbon Impacted Soil _ As stated in the October 1993 and April 1994 Quarterly Reports prepared by GeoAudit, trace concentrations of benzene (0 006 ppm) and toluene (0 007 ppm) were detected in an excavation soil sample at a depth of 39 feet (Table 2), benzene (0 0079 ppm) was also Ilkdetected in a soil sample from MW-2 (132-45, Table 3). However, no TPH were detected in any of these samples All detected concentrations are lust above reporting limits and should pose no health risk due to the extremely low concentrations and remote location from human receptors GeoAudit estimates that only 10 to 20 cubic yards of hydrocarbon impacted soil remains at ' the site The impacted soil has an average benzene/toluene concentration of 0.005 ppm or Iess and has shown no impact to groundwater for more than one year Furthermore, any attempt at remediation of such a small volume of soil (and low level) would likely be ineffective and not cost efficient o.i.p.,A Alma.s.�3. 1 1