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Total Petroleum Hydrocarbon as Diesel(TPHD) <br /> TPHD was not detected during the CPT investigation, but was detected at significant <br /> concentrations in the monitoring wells Zones A and C were assumed to be clean The mass of <br /> TPHD in zone B was calculated from the monitoring well data The mass of TPHD was <br /> estimated to be 3,538 grams (7 8 pounds) The TPHD contours used to calculate the TPHD mass <br /> are shown in Appendix E, Figure E-1 <br /> Total Petroleum Hydrocarbon as Gasoline(TPHg) <br /> TPHg was not detected in the monitoring wells, but was detected in zones A and C during the <br /> CPT investigation Based on the CPT data, zone B was assumed to contain a negligible mass of <br /> TPHg The extent of TPHg in zones A and C was assumed to be same The mass of TPHg was <br /> estimated to be 16 grams (0 04 pounds) The TPHg contours used to calculate the TPHg mass <br /> are shown in Appendix E, Figure E-2 <br /> Benzene <br /> Benzene was detected in both the CPT investigation and in the monitoring wells The extent of <br /> benzene was assumed to be the same in zones A, B and C The mass of benzene was estimated <br /> to be 84 grams (0 19 pounds) The benzene contours used to calculate the benzene mass are <br /> shown in Appendix E, Figure E-3 <br /> Toluene <br /> Toluene was not detected in the monitoring wells, but was detected at trace concentrations in <br /> CPT samples corresponding to zones B and C Zone A was assumed to contain a negligible <br /> mass of toluene The mass of toluene was estimated to be 0 07 grams (1 6 x 10-4 pounds) The <br /> toluene contours used to calculate the toluene mass are shown in Appendix E, Figure E-4 <br /> Ethylbenzene <br /> Ethylbenzene was detected in the monitoring wells and the CPT samples The extent of <br /> ethylbenzene was assumed to be the same in zones A, B, and C The mass of ethylbenzene was <br /> estimated to be 81 grams (0 18 pounds) The ethylbenzene contours used to calculate the <br /> ethylbenzene mass are shown in Appendix E, Figure E-5 <br /> Xylenes <br /> Xylenes were detected in monitoring wells and the CPT samples The extent of xylenes was <br /> assumed to be the same in zones A, B, and C The mass of xylenes was estimated to be <br /> 113 grams (0 25 pounds) The xylene contours used to calculate the xylene mass are shown in <br /> Appendix E, Figure E-6 <br /> NISWDA7002iPFiAPdH4831 &W..2ab&C &3 <br /> arzrroz <br />