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V �..1 k" KL EINFELDER On October 1, 2003 the contents of the septic tank were removed by Clean Harbor of Sacramento, California by vacuum truck and pumped to a temporary above ground poly tank. The contents were chlorinated to reduce the coliform bacteria content. The concrete septic tank was then removed from the ground and placed on 10 mil plastic sheeting. A final soil sample (B- 7) was collected from the native soil beneath the tank for laboratory analysis. Observations The limits of the septic tank and leach line were delineated during the excavation activities. During both excavation dates (8/13/03 and 8/29/03) the leach field was defined by the presence of large gravel to small cobble sized rock. Native soil beneath the leach field was defined by silty sand to clayey silt, brown, and slightly moist. There was no staining of the underlying soil and no suspect odors noted. Based on the original records obtained from the EHD (Application for Sanitary Permit, issued September 14, 1970) the leach line was expected to extend a distance of 90 feet north of the tank. However, during the excavation of the leach line it was found to only extend a total of approximately 45 feet north of the tank. No seepage pit was found at the end of the leach line as described in the permit, however, a large excavation filled with pea gravel was present. The total depth of the pea gravel (sump) was approximately 4 feet deep. No staining or odors were noted within the gravel sump. During the August 29, 2003 confirmation sampling event an additional leach line was uncovered. Its presence suggested that the septic system had been repaired at some point without a documented permit on file with San Joaquin County. The leach line was followed approximately 43 feet north of the tank. An excavation was advanced to a depth of approximately 4 feet below the ground surface (bgs). A soil sample (B-6) was collected at this location for laboratory analysis. The soil in this interval was field screened with a photoionization detector and PID readings were 0.6 parts per million (ppm). There was no staining observed on the soil surface directly below the tank following the tank removal on October 1, 2003. Although the tank had broken apart during removal there were no obvious signs of failure such as cracks indicating previous leakage. Laboratory Analysis The soil samples were submitted to Sequoia Analytical of Sacramento, California, a laboratory certified by the State of California for the proposed analyses. The 7 soil samples were analyzed for: • Total Purgeable Petroleum Hydrocarbons as referenced to Gasoline {TPH-G) by EPA Method 8015M • Total Extractable Petroleum Hydrocarbons as referenced to Diesel {TPH-D) by EPA Method 8015M .- • Benzene, Toluene, Ethylbenzene, and Xylene by EPA Method 8020. • Volatile Organic Compounds by EPA Method 8260B 34202.E01 / ST03R1609 Page 3 of 7 Copyright 2003 Kleinfelder, Inc. October 31, 2003 rr