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APPENDIX L <br /> MTBE.ADSORBED VOLUME-MASS CALCULATIONS <br /> FLAG CITY CHEVRON <br /> 6421 Capitol Avenue, Lodi CA <br /> Assumptions <br /> The general shape of MTBE-impacted ground water at the site can be modeled as an elbow-shaped plume(Figure 13) <br /> By splitting the plume into two segments(northern and southern),the volume can be calculated for each segment utilizing <br /> the equation for an elliptic cone <br /> V,,„.=1/3xabh, <br /> « „ « » <br /> where a is the is file semi-mayor axis of the cone, b is the semi-minor axis,and"Y'is the height <br /> 6 <br /> S€6 Mtn+ <br /> The average MTBE concentration in the northern segment was calculated to be 0 077 mg/kg, the average MTBE <br /> concentration in the southern segment was calculated to be 0 145 mg/kg The average was calculated by summing the <br /> detected MTBE concentrations in each segment and dividmg by the total number of detections <br /> 1) Approximate volume of MTBE-impacted soil in Northern Segment (VNJ <br /> For the estimated northern segment a=8 ft,b= 57 ft,h= 140 ft <br /> VNs=(1 05)(8 ft)(57 ft){140 ft)-4 67,032 fl(1201bs/ft) - 8,043,840 lbs soil <br /> Using 0 077 mg/kg as the"average"concentration in MTBE impacted soil of the northern segment,the mass can be <br /> calculated to be <br /> weight of soil-average concentration i 8,043,840 lbs-0 000000077=0.62 lbs of MTBE <br /> Convening lbs of MTBE to volume of MTBE(gallons)using density of MTBE equal to 6 18 lbs/gal <br /> 0 62 lbs of MTBE—6 18 lbs/gal=0.1 gal MTBE <br /> Advanced GeoEnvironmental,Inc <br />