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TABLE2 Page 3 of 3 <br /> GROUNDWATER EXTRACTION-OPERATION AND MASS REMOVAL DATA <br /> SHELL-BRANDED SERVICE STATION <br /> 6131 PACIFIC AVENUE,STOCRTON,CALIFORNIA - <br /> Period TPHg Benzene TBA MTBE <br /> Site Hour Flow Meter Period Instantaneous Operational Cumulative 7PAg Period Cumulative Benzene Period Cumdatloe IBA Period Cumu/atige MTBE Period Cumulative <br /> Visit Meter Reading Volume Flow Rate Flow Rat Volume Cone. Removal Removal Cone Removal Removal Cone Removal Removal Coma Removal Removal <br /> (mm/dd/yy) (hours) (gaq (qo0 (gPm) (gpm) (gal) (pg/L) (pounds) (Pounds) (pg1L) (Pounds) (pounds) 6WV (pounds) (pounds) (pg/L) (Pounds) (Pounds) <br /> NA=not analyzed <br /> NM=Notseasured <br /> Mass removed based on the formula:volume extracted(gal)x Concentration(mg/L)x(g/10°mg)x(pound/453.6g)x(3.785 L/gal) <br /> When constituents are not detected,the concentration is assumed to be equal to half the detection limit's subsequent calculations. <br /> Volume removal data based on Bre formula:arias(pounds)x(density)''(cc/g)x 453.6(g/pound)x(L/1000 oc)x(gal/3.785 L) <br /> Period operational flow rate based on the formula:(cumulative volume(gal))/(current hour meter reading-last hos meter reading(hr))/(60(mm/hr)) <br /> Density inputs:TPHg=0.73 g/m,Bervme-0.88 g/cc,TBA=0.78 g/cc,MTBE=0.74 glue <br /> TPHg analyzed by EPA Method 82606;BTEX,TBA,and MTBE analyzed by EPA Method 8260B - <br /> r=Influent sample collected on April 4,2007 was anayyzed for TPH. <br /> z=The July 3,2007 effluent sample was not analyzed for HEMSGr Oil&Grease due to bottle preservation issues;therefore an additional effluent sample was collected on July 27,2007 to be analyzed for HEM-SGT OE&Grease. <br /> Italicized data-the hour meter was inoperable so the flow rata was estimated based on 100%continuous operation <br /> Solleco hour meter used for period operational flow rate between May 15,2007 and June 19,2007. <br /> System shutdown between May 22,2007 and June 8,2007 due to equipment malfunction. <br /> CRA 29aR54CWB OF Data _ <br />