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• The essentially flat groundwater gradient along the bottom of the groundwater trough <br /> • (0.00024 ft/ft) may have allowed petroleum hydrocarbons to migrate upgradient along <br />' the bottom of the trough through dispersion processes <br /> • The core of depression created m the water table during the purging of MW-9 allowed <br /> contaminated groundwater from downgradient to enter the well <br /> • The laboratory and/or glassware instruments were contaminated from a previous project <br /> when the MW-9 sample was analyzed causing a false detection of TPH-g in this sample <br /> • A contaminant plume from another site located upgradient of the HSA building is <br />' beginning to enter the subject site. <br /> 1 These possibilities will be further evaluated in the next groundwater monitoring report <br /> 1 The highest concentrations of hydrocarbons were detected in samples from MW-2 and MW-2A <br /> No petroleum hydrocarbons were detected in samples collected at MW-4 or MW-5 <br /> li <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> NCASheredWROJEGTSLSAN]OQIHSASaQWRPT"D 5 <br /> 1 <br />