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M1INICXj-[fRM ' Mr. Charles Leubner 23 September 1997 ' Page 2 Diesel Tank As part of the removal activities for the 10,000-gallon underground diesel fuel storage tank, five soil samples were collected from the tank excavation at the locations shown of Figure 2. The results of that sampling are shown on Table 1. Total Extractable Petroleum Hydrocarbons as diesel (TEPH) were detected above method detection limits only in the sample collected from the southeast corner of the excavation (refer to Figure 3 location 039). TEPH was detected at 1,200 mg/Kg in sample 039 which was collected at a depth of 14 feet below the ground surface. This was the location of the remote fill line for the tank. There were no detectable concentrations of benzene, ethylbenzene, toluene, and xylenes found in any of the samples collected from the excavation. I Two soil borings (SB-5 and SB-6) were sampled using the GeoProbe method to evaluate the extent of petroleum hydrocarbons remaining in the soil (See Figure 3). The deeper boring (SB-5) was located in native soil next to the southeast corner of the backfilled tank excavation. This boring was sampled to a depth of 20 feet, which was approximately 5 feet below the groundwater surface measured in the sampling probe. A second soil boring was drilled further from the excavation to a depth of 20 feet to evaluate the lateral extent of hydrocarbons in the soil. In . accordance with the County's request, one groundwater sample was also collected for laboratory analysis. The hydrocarbons of concern at this site were Total Extractable Petroleum Hydrocarbons as diesel, benzene,toluene, ethylbenzene, and xylenes. Remote Fill Piping Soil samples were collected during the removal of the diesel tank at a depth of approximately 3 feet at 20-foot intervals along the remote fill line. One of the samples (Sample No. 045) was found to contain TEPH at a concentration of 5,000 mg/Kg. Four soil borings (SB-7, -8,-9 and -10) were driven to a depth of 10 feet and sampled using the GeoProbe method to evaluate the vertical and lateral extent of hydrocarbons in this area (see Figure 3). Boring (SB-10) was located over the site of sample No. 045 and samples were collected at depths of 5 and 10 feet for laboratory analyses to assess the vertical extent of diesel in soil. Samples from a depth of 5 feet were collected from the three other boirngs (SB-7, SB-8, and SB-9) to assess the lateral extent of diesel in soil. These three soil boirngs appered to be located in native soil. The hydrocarbons of concern at this site were TEPH as diesel, benzene, toluene, ethylbenzene, and xylenes. I