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Table 4 <br /> Joe's Truck Plaza <br /> 15600 South Harlan Road <br /> Lathrop, California <br /> Petroleum Hydrearbon Mass Extraction Rates Summary <br /> Test Well Influent Concentration Extraction Rate from <br /> Date ID Flowrate (m m) Wells (lbs/da ) <br /> (cfm) TPHG Benzene MTBE TPHG Benzene MTBE <br /> 06/15/04 MW-7 880 <15 <0 15 1 7 <0 119 <0 001 0 013 <br /> 06/16/04 MW-7 870 14 <0 12 29 0 109 <0 001 0 023 <br /> Test Well volume of Influent Concentration Mass Extracted from <br /> Date ID groundwater <br /> ( ) roundwater(lbs) <br /> extracted, <br /> gallons TPHG Benzene MTBE TPHG Benzene MTBE <br /> 06/14/04 MW-7 2,3401 X50 <0 50 90 <0 001 <0 00001 0 002 <br /> 06/16/04 MW-7 15,320 2 <50 <0 50 96 <0 006 <0 0001 0 012 <br /> Sample Calculations <br /> Ext Rate from = 88 cu ft x 17 mg lb x 1,440 nun x cu meter <br /> Wells (vapor) iron cu meter 453593 mg day 35 314 cu ft <br /> 0 013 lbs/day <br /> Mass removed = concentration /L x gallons extracted x 2 2046 x 10)()(lb/mg)/0 26418 al/L <br /> (Fig ) g ( ){ g) (g ) <br /> from groundwater <br /> 1 Totalizer reading at the beginning of test on 6/14/04 12 00 hrs =24,340 gallons <br /> Totalizer reading at the time of sampling on 6/14/04 20 30 hrs =26,680 gallons <br /> Therefore volume of groundwater extracted =26,680-24,340= 2,340 gallons <br /> Totalizer reading at 6114/04 20 30 hrs= 26,680 gallons <br /> Totalizer reading at the time of sampling on 6/16104 11 05 hrs= 42,000 gallons <br /> Therefore, volume of groundwater extracted between 6/14 and 6/16 =42000-26680= 15,320 gallons <br /> Mass Extraction Rate in Groundwater <br /> Based on average flow rate of 7 2 gpm,volume of water extracted per day is 10,368 gallons <br /> and considering an average MTBE concentration of 93 µg/L, the mass extraction rate for <br /> MTBE is estimated to be approximately 0 008 pounds per day <br /> Joe's Truck DPE Test Tables Page 1 of 1 5rKA TV5 <br />