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Woodward-Clyde Ms. Linda Turkatte San Joaquin County Environmental Health Division August 5, 1996 Page 4 Soil samples were collected by WCFS after the excavation activities. The track-mounted backhoe was used to collect soil samples from thebottomof°the excavation'.below the former north end of the UST. 'Four soil samples-wer-e collected-and analyzed for TPH as diesel,-and BTEX. A summary of-analytical results of the four soil samples is presented in Table 1. Sample locations are shown on Figure 3. Table 1 - Summary of Analytical Results of Soil Samples Collected April 30,4996-at KJAX - Radio Station Transmitter, Stockton, California. All Results are in mg/Kg(parts per million—e-ppm). TPH'. Depth as Petro Sample in Feet Diesel FLAG Benzene Toluenes Ethylbenzene Xylenes2 KRST-1 21.5 <10 52 - <0.005 <0.005 <0.005 <0.005 r KRST-2 21 <10 79 <0.005 <0.005 <0.005 <0.005 L9 KRST-3 20.5 <10 27 <0.005 <0.005 <0.005 <0.005 KRST-4 20.5 <10 N/A. <0,005. <0:005: <0.005 <0.005 Notes: 1) Total Petroleum Hydrocarbons-by modified.EPA Method 8015 2)BTEX as Benzene, Toluene, Ethylbenzene, Total Xylenes by EPA Method 8020. 3)N/A = Sample was not field screened. Initially WCFS directed the contractor to removethe approximately 130 cubic yards of sand and pea gravel and clean backfill material that was-present in the excavation. . The backfill material was stockpiled-adjacent to the excavation. A photoionization detector (PI-D) and Petro- FLAG hydrocarbon test kit calibrated-for TPH as diesel was used for field screening. The PID readings were used to assess the potential of volatile hydrocarbons of soil removed from the excavation. The Petro FLAG screening was used to confirm that soil samples collectedfrom the bottom of the excavation pit were free. of diesel contamination below the-allowable-limit L (100 mg/Kg). Once the.-Petro FLAG screening results indicated that soils were below the allowable limit, no additional soil was excavated. Ll -- a