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ii <br /> • Vs3 =Volume of impacted soil between 2 and 12 feet bgs is 1,000 feet3 (A,3 x H,3) <br /> • AS = Impacted soil area is assumed to be 100 feet' (10' by 10') <br /> • HS= Impacted soil thickness assumed to be-10 feet <br /> • Cs3 =Result ofione soil sample from the November 1994 investigation at a concentration <br /> of 3,400 mg/kg of DRO. <br /> • Calculated Residual Mass of DRO — 411.4 ]bs <br /> Total Calculated Residual Mass of DRO (0.12 lbs + 919.6 lbs+411.4 lbs) = 1,331.12 lbs <br /> Soil Assumptions—MTBE (Two discreet areas) <br /> • V5, =Volume of impacted soil between 2 and 12 feet bgs is 1;000 feet3 (A,, x H,,.) <br /> • AS=Impacted soil area is assumed to be 100 feet2 (10' by 10') <br /> • HS = Impacted soil thickness assumed to be 10 feet <br /> • CS, =Result of one soil sample from the December 1998 investigation at a concentration <br /> of 1.8 mg/kg of MTBE. <br /> • Calculated Residual Mass of MTBE = 0.22 lbs <br /> • VS-3 =Volume of impacted soil is 9,500 feet3 (A,;?x H s3) <br /> • AS= Impacted soil area is assumed to be 950 feet' (25' by 38') <br /> • HS = Impacted soil thickness assumed to be 10 feet <br /> CS, =Result of six soil.Samples from the December 1.998 investigation at an average <br /> concentration of 46.7 mg/kg of MTBE. <br /> • Calculated Residual Mass of MTBE —53.7 lbs <br /> • Total Calculated Residual Mass of MTBE (0.22 lbs +53.7 lbs) = 53.92 lbs <br /> Attachment A Page 2 of 2 Closure Solutions Inc. <br />