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�L 2% <br /> CONTAMINANT MASS CALCULATIONS <br /> QUANTITY REMOVED IN SOIL AND GROUNDWATER <br /> 8960 W. Walnut Grove Rd, Thornton, CA <br /> Mass Removed from Groundwater. <br /> Based on March 2000 analytical results of groundwater present in tank pit prior to interim remedial <br /> activities Approximately 60,000 gallons of groundwater was removed <br /> mass = (Volume In gal)(Conc in ppb)(E-9)(7 48 gallcu ft)(8 34 Ib/gal)(0 4536 kg/lb) <br /> Groundwater Removed From Tank Pit <br /> TPHg 60000 320,000 726341 15979 <br /> TPHd 60000 46,000 104411 2297 <br /> Benzene 60000 1,900 04313 095 <br /> Benzene 60000 5,200 1 1803 260 <br /> Benzene 60000 4,7001 1 0668 2 35 <br /> Benzene 600001 2,800 06355 140 <br /> MTBE 600001 3,5001 07944 1 75 <br /> • Mass remaining in Groundwater <br /> Based on isoconcentration contours shown on June 2003 isoconcentrabon map <br /> Only MTBE detected in any groundwater samples <br /> mass=(Volume in cu ft)(porosity)(Conc in ppb)(E-9)(7 48 gal/cu ft)(8 34 Ib/gal)(0 4536 kg/lb) <br /> Total thickness of aquifer is assumed to be 20 feet, porosity is 0 30 <br /> AreaVolume Average Mass of Mass of <br /> Contaminant (sq ft.) (cu.ft.) Concentration Contaminant Contaminant <br /> (ug/1) k lbs <br /> Zone 1 -Inner contour(50 ppb) <br /> MTBE 967 fit F 193521 7501 001441 00316 <br /> Zane 2 - Between 50 ppb and Primary MCL (13 ppb) Subtracting out Zone 1) <br /> MTBE 1 60071 1201401 31 51 0 0375 008251 <br /> r <br /> one 3-Between Primary MCL and Secondary INCL(5 ppb)Subtracting out Zones 1 and 2 and ND near Mw4 <br /> TBE 148781 2975601 901 002651 0 0584 <br /> Total Mass of Contaminants Dissolved in Groundwater <br /> MTBE 0081 0 17 <br /> contmass soilla As <br />