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b. Final Mass Contaminants = Concentration x density x volume <br /> 1 . TPHG 0 . 0/106 x 43lbs/ft3 x 2700ft3 0. 0 pounds <br /> 2 . Benzene 0 . 003/106 x 56lbs/ft3 x 2700ft3 = 0 .0005 pounds <br /> 3 . Toluene 0. 0/106 x 56lbs/ft3 x 2700ft3 = 0 . 0 pounds <br /> 4. Ethyl B 0 . 0005/106 x 561bs/ft3 x 2700ft3 = 0 . 00008 pounds <br /> 5 . Xylene 0. 00005/106 x 56lbs/ft3 x 2700ft3 = 0 . 000008 pounds <br /> 6 . MTBE 0 . 0022/106 x 44lbs/ft3 x 2700ft3 = 0 . 0003 pounds <br /> TABLE D <br /> MA-SS OF CONTAMINANTS REMAINING IN POUNDS <br /> COMPOUND SOIL GROUNDWATER <br /> TPHD 0 0 <br /> TPHG 0 0 <br /> i <br /> B 1 . 2 0 . 0005 <br /> T 0 . 76 0 . 0 <br /> E <br /> 3 . 2 0 . 00008 <br /> X 0 . 67 0 . 000008 <br /> s <br /> MTBE 0 0 . 0003 <br /> 10. FILE CLOSURE RATIONAL <br /> I <br /> Attenuation by natural biodegradation of the remaining <br /> hydrocarbon contaminants should remediate both the soil and the <br /> contaminant plume in the shallow aquifer in a few years. <br /> There appears to be no risk to public health or the groundwater <br /> of the state. ' <br /> 's <br /> No MTBE was detected in the soil collected during the soil j <br /> sampling events . <br /> The reported concentrations of TPHG and BTEX remaining in the <br /> groundwater have decreased significantly over the last 15 months. <br /> The estimated values of TPHG and BTEX remaining in the soil is <br /> 0 . 0, 0 . 14, 0 . 09 , 0 . 38 and 0 . 08 PPM respectively. <br /> i 13 <br />