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ATTACHMENT A <br /> . Volume of Remaining Impacted Soil <br /> The remaining impacted soil at the site can be viewed as two cylinders <br /> (2) 7F <br /> + <br /> t -iL <br /> To calculate the volume of the cylinders <br /> (1) V=Trr2h V=ar(7 ft)2(6 ft) -= 616 W = 23 cubic yards <br /> (2) V=7rr2h V=Tr(15 ft)2(4 ft) = 2827 W = 104 cubic yards <br /> Therefore, the volume of remaining imacted soil can be estimated to be 127 cubic yards <br /> Average Concentration of Remaining Impacted Soil <br /> To estimate the average concentration of the remaining impacted soil we can use data <br /> obtained from soil samples MW2-45 (monitoring well MW-2), B-1-40, B-1-50 (both from <br /> bonng B-1) and 135-39 (excavation soil sample) <br /> (1) MW2-45 benzene 0 0079 ppm <br /> --------------------------------- <br /> Total 0 0079 ppm <br /> (2) B-1-40 TPH-g 13 ppm <br /> benzene 021 <br /> toluene 26 <br /> ethylbenzene 0 37 <br /> xylenes 13 <br /> ---------------------------- <br /> Total 17 48 ppm <br /> (3) B-1-50 benzene 001 <br /> toluene 0 025 <br /> xylenes 0 007 <br /> ---------------------------------- <br /> Total 0 042 ppm <br /> i 4 <br />