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• 21 August 2003 AGE -NC Project No 03-1055 Page 3 of 10 A health and safety plan will be updated in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U S Coast Guard and U S Environmental Protection Agency, 1985) Prior to mobilization, the area of excavation will be clearly marked and a utility clearance obtained through Underground Service Alert 2 2 MONITORING WELL ABANDONMENT Prior to excavation, monitoring wells MW -1, MW -3, and MW -4 (Figure 3) will be abandoned by over-drilling to total depth and backfilling with portland cement The wells will be abandoned in accordance with EHD guidelines 23 SOIL EXCAVATION Hydrocarbon -impacted soil at the western portion of the property immediately north of the northern dispenser excavation area will be excavated to facilitate an overall mass reduction of contaminants Based upon Iaboratory results of soil samples collected during site assessment activities of 22 July 2003, AGE estimated the removal of approximately 335 cubic yards of impacted soil (an approximately 30 -foot by 15 -foot by 20 -foot volume) from the site using an excavator (Figure 3) During excavation, soil will be screened for organic vapors (OVs) using a organic vapor meter (OVM) Excavated soil that appears visibly stained or has a petroleum hydrocarbon odor will be considered impacted The excavation maybe enlarged ifhigh concentrations ofcontammants are still detected in the soil 2 3 1 Soil Sampling and Analysis Soil samples will be collected from the excavation and submitted for laboratory analysis Following State of California Regional Water Quality Board, Tri -Regional Board recommendations, soil samples will be collected from each side-wall of the excavation at a minimum interval of every 20 linear feet, and from the base of the excavation at a minimum of one sample for every 400 square feet of excavation area In addition, soil samples will also be collected from the stockpiled soil from the excavation For soil disposal characterization, a 4 1 composite soil sample will be collected from every 100 yards of soil excavated Field procedures for collection of soil samples are presented in Section 4 2 Each soil sample will be analyzed by a State of California Department of Health Services (DHS)- certified DHS)- certifed laboratory for the following constituents Advanced GeoEnvsronmental, Inc