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z <br /> „ .-M"14MR- <br /> WN <br /> T+ , <br /> FAddendumTon September 18, 1989 <br /> California AGS No. 38048-2W <br /> tion plan to remove contaminated soil stated in our work plan <br /> includes <br /> o excavating to the limits of contamination or the safe operating limits of the <br /> equipment; <br /> o collecting soil samples from the limits of the excavation, and performing the <br /> analyzes outliner in tf:e Regional Board Staff Recommendations for Inii:%l <br /> Evaluation and Investigation of Underground Tanks; <br /> o stockpiling the soil, collecting composite samples of the stockpiled soil. <br /> analyzing the samples for appropriate contaminants to evaluate disposal <br /> options; and <br /> o disposing of contaminated sail in an appropriate facility. <br /> t✓ Our soil remediation plan for residual contaminants,if laboratory analyses indicate <br /> contaminatiok-i remains in place ai the conclusion of the excavation, includes <br /> ,.., o drilling soil borings,.and collecting and analyzing soil samples to delineate <br /> soil contamination; and <br /> o evaluating remediation options based on the results of delineation. <br /> (3) Top and cross sectional diagrams of the proposed excavation site. <br /> The excavated length and width of the former waste-oil tank cavity, was <br /> approximately 8 feet. The cavity was excavated to approximately 8 feet below grade <br /> and backfilled with approximately 19 cubic yards of clean pea gravel. Cross section <br /> A-A'on Plate P-2 shows the approximate limits of the proposed excavation as 14 feet <br /> in the north-south direction, 14 feet in the east-west direction and 18 feet in the <br /> vertical direction. Excavation to the west may be limited by the station building. <br /> The vertical direction is the safe excavation limit of the equipment. We estimate 110 <br /> cubic yards of soil may be excavated. At ARCO's request,we will arrange to have <br /> the contaminated soil hauled to an appropriate disposal facility. <br /> u 2 <br /> A,cap/ied GeoSyslelns ' <br />