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Geological Teclutics lits. Page 3 Work Plan Project No. 1128.2 October 22,2003 2.1.2 Laboratory Analyses One soil sample from the bottom of each borehole will be submitted to the laboratory for analysis. The soil samples will be submitted to CLS of Rancho Cordova (State Certified Laboratory#1233) for the following analysis: • Volatile Organic Compounds (VOCs)by EPA method 8260B • Semi-volatile Organic Compounds (VOCs) by EPA method 8270C A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity. The reporting limits for these compounds are listed below. ReportingLimits: Soil !tg/kg) 5-100 - 2.2 Septic Tank Remediation The following measures will be taken to remove the threat the chemicals contained in these tanks pose to the environment. 2.2.1 Septic Tank Cleanout Clean Harbor has been contacted and will do the work to remove the contaminated sewer water from the two septic tanks. The contents of the tanks will be vacuum extracted from the tanks, the tanks will be pressure washed so that the walls and floor of the tanks can be investigated for cracks and holes. The contents of the tank and the wash washer will be contained onsite in a Baker tank. 2.2.2 Laboratory Analyses Once the tanks have been emptied and washed, a representative sample of the sewer water in the Baker Tank will be collected and analyzed as outlined above in Section 2.1.2. The reporting limits for these compounds are listed below. eport ng emits: 113 8270 Water µg 5-10 - 2.2.3 Onsite Treatment Clean Harbor will treat the sewer water onsite in the Baker Tank with chlorine to kill the bacteria. Once this has been done, the water will be pumped into a tanker truck for transportation to the disposal facility. 2.2.4 Disposal Options The concentration of volatile organic compounds and semi-volatile organic compounds will dictate the disposal method that will have to be used. Therefore, we propose that the decision on disposal be made from the sample collected in the Baker tank. This sample will represent the average concentration of these chemical compounds as present in all four chambers of the septic tanks. If the concentrations are too high, the disposal will have to include incineration, which is a very expensive process. Otherwise, the less expensive landfill disposal method can be used.