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r <br /> Appendix A - Historical Background <br /> AGE-NC Project No 02-0964 <br /> Page 7 of 7 <br /> However,petroleum hydrocarbons increase again below 100 feet bsg,to high concentrations <br /> of between 11,000 µg/1 and 14,000 [g/1 TPH-g at depths of between 120 and 150 feet bsg <br /> The vertical distribution of TPH-g concentrations suggests that the primary source of <br /> contamination maybe the Chevron(northeastern) dispenser island,but docs not rule out the <br /> farmer Standard Oil USTs as an additional source <br /> • The up-gradient and cross-gradient (south) limits of petroleum hydrocarbon-impacted soil <br /> and ground water have been determine The vertical and down-gradient lateral extent of <br /> petroleum hydrocarbon-impacted soil and ground water has not been defined, at this time <br /> (See Attached Figures) <br /> Advanced GeoEnvironmentai <br />