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- au Mr. Chuck Carmel January 13. 1992 Page 2 for disposal by Walt Lewis Construction under Manifest No. 90792694. The tank was certified as safe (not a fire hazard) by E.:;kson. Inc., under document No. 6470. A copy of the manifest and safety certificate are included with this letter as Attachment A. Two soil samples (T-South and T-North) were collected from the bottom of the tank excavation. Figure 1 shows the locations of these samples. The soil sarxples were collected from the bucket of the backhoe used for the tank excavation to avoid having people enter the excavation. The soil in the bottom of the excavation had a slight hydrocarbon odor. The pea gravel removed from the excavation (which, according to the contractor Walt F. Lewis Construction Company, Inc., did not have a hydrocarbon odor) was placed back in the excavation along with clean imported gravel. Waste Oil Tank Installation On the same day (September 23, 1991) as the recovery tank was removed, an underground waste oil tank was installed on the west end of the station building. After the excavation was completed for the waste oi] tank, one soil sample(WO-Pit)was collected from the bottom of the excavation. Figure 1 shows the location of this sample. The soil sampling procedures used in the collection of the samples from the recovery tank were also used here. Very slight hydrocarbon odors were detected in the soil in this location. Walt Lewis Construction completed the installation of the tank. Soil Sampling Results The soil samples were transported to NET Pacific Laboratories in an ice chest packed with ice. The samples were analyzed for benzene,ethylbenzene,toluene,and xylenes(BEH and total petroleum hydrocarbons as gasoline(TPH-G)using the Environmental Protection Agency (EPA) Methods 8015,Modified and 8020. In addition, samples T-North and T South were analyzed for ethylene dibromide using EPA Method 8240,and samples T-North,WO-Pit,and WOS-Camp were analyzed for total lead using EPA Method 7421. Table 1 presents the analytical results of the soil samples collected during the tank removal and 'installation. A complete laboratory report is included with this letter as Attachment B. On composite soil sample(WOS-Comp)was collected from the approximately 30 cubic yards of soil stoe,piled from the excavation. In addition to the analytical parameters listed above, this sample was analyzed fox pH-corrosivity,flashpoint,total sulfide,and total cyanide(as per CFR Title 22). These analyses were conducted to characterize the soil for disposal purposes, Based on the analytical results of the composite sample, the stockpiled soil was transported to BFI Landfill in Livermore, California. The soil was transported on October 25, 1991 by Dillard Trucking Company, Docume=ntation of the soil transport is included with this letter as Attachment C. grown and Caldwell