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KI FINFFI I FR lead 12 mg/kg 750 mg/kg Zinc 400 mg/kg 160,000 mg/kg The attached table details the results of the laboratory analysis conducted on the soil samples collected at the site and sludge samples collected from the tank. The certified laboratory results are also attached. DISPOSITION OF SLUDGE AND FORMER SEPTIC TANK The contents of the tank contents (sludge and water) was containerized on site pending the final laboratory analysis. The contents were chlorinated with chlorine bleach to reduce the coliform content prior to disposal. Initially, approximately 10 gallons of bleach was added to approximately 750 gallons of sludge/rinseate. Subsequent laboratory analyses did not achieve the results required for proper disposal, so additional water and chlorine bleach was added. A total of 56 gallons of chlorine bleach was added to the diluted contents (approximately 1,600 gallons). The pH level was checked on the site with a handheld pH meter. The pH was observed below 9.5. The laboratory data sheets are attached to this report. In accordance with waste hauling protocols, the tank contents were transferred via tanker truck to the Clean -Harbors waste facility under manifest. The waste manifest is attached to this report. Additionally, the former tank was hauled off site for similar disposal. The manifest for the disposal of the tank is also attached. CONCLUSIONS AND RECOMMENDATIONS Based on the results reported from the soil sampling activities conducted along the leach line and from beneath the former septic tank at the site, it appears that no appreciable impacts to the soils have been determined to have occurred in reference to the suite of laboratory analyses performed. Groundwater analyses was not required or performed due to the low concentrations of analytes found in the soil samples and based on the proximity of groundwater to the site. The concentrations of metals detected for instance, may be considered naturally occurring background concentrations in soil for the Stockton area. The detected concentrations of TPH-d are very low, and may be attributable to organic matter in the soil profile. There are no PRGs for TPH-d although concentrations below 100 ppm or mg/kg usually do not require further action. The State RWQCB has established 100 mg/kg in soil as concentration to prioritize case loads and to aid in determining if a significant release had occurred. The former tank contents have been characterized in accordance with the laboratory analyses listed above and listed in the attached table. All of the detected concentrations of analytes which have applicable PRGs were well below the recommended concentrations. The disposal of the former tank and tank contents has been facilitated by ECO -SAFE and Clean Harbors landfill. Under manifest, the material were transported to the Clean Harbors, Environmental Service, Iiic. 34202.E01 / ST03R1609 Page 5 of 7 Copyright 2003 Kleinfelder, Inc. October 31, 2003 1.0