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• 3.0 EXCAVATION PROCEDURES <br /> Hydrocarbon impacted soil will be excavated from the former tank pit and stockpiled on-site <br /> pending analytical results. A representative of GeoAudit will supervise and direct the <br /> excavation and will collect all necessary soil samples. To meet the project objectives, the <br /> following activities will be performed: <br /> 1) Prepare a site health and safety plan in accordance with Occupational Safety and <br /> Health Guidance Manual for Hazardous Waste Site Activities (Prepared by National <br /> Institute for Occupational Safety and Health Administration, U.S. Coast Guard and <br /> U.S. Environmental Protection Agency, 1985). <br /> 2) Notify PHS/EHD 48 hours prior to field work. <br /> 3) Excavate the contaminated soil using an excavator. Hydrocarbons were detected in <br /> soil samples at depths of approximately 20 feet. Organic vapors were also detected <br /> by a PID at a depth of 25 feet. The approximate area to be excavated will be 15 X <br /> 20 feet. Assuming the removal of contaminated soil to a depth of approximately 25 <br /> feet, the volume of soil that will be removed is approximately 250 cubic yards. <br /> 4) As excavation proceeds, monitor excavated soil for the presence of volatile organics <br /> using a photo-ionization detector(PID). Soil will be segregated into"clean"stockpiles <br /> and "contaminated" stockpiles based upon PID measurements. <br /> 5) Stockpile the excavated soil on plastic sheeting, pending analytical results. <br /> Contaminated soil will be stockpiled adjacent to the excavation. The clean soil will <br /> be used to backfill the excavation upon completion of digging (Figure 2). <br /> 6) If necessary, spray the excavated soil with water to minimize t1re release of volatile <br /> organic compounds into the atmosphere. Upon completion of excavation activities, <br /> the removed soil will be covered with plastic sheeting. <br /> 7) Collect soil samples from the sidewalls and floor of excavation, with the excavator <br /> bucket in pre-cleaned brass tubes, as directed by a representative of the San Joaquin <br /> County Public Health Services - Environmental Health Division (PHS/EHD). <br /> 8) Seal samples with aluminum foil, cap, and store on ice pending transportation to a <br /> state-certified laboratory. <br /> 9) Label and log soil samples on a chain of custody form. <br /> 10) Analyze soil samples for total petroleum hydrocarbons (TPH as gasoline) and volatile <br /> aromatics (BTE&X) in accordance with EPA methods 8015m and 8020, respectively. <br /> Ge Iopml Audit Services,Inc. 3 <br /> 735/3-94/MAYER—pi <br />