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4.0 CONCLUSIONS <br /> Concentrations of petroleum hydrocarbons decreased in source area well MW-2A Petroleum <br /> hydrocarbons were not detected in MW-6 for the first time since the rapid increase in the water <br /> table that occurred during the first quarter 1998. The decreasing concentrations are most likely <br /> due to natural bioremediation. Groundwater flows into a trough and then to the northeast with <br /> a horizontal gradient of 0 000095 ft/ft <br /> I <br /> UPR07ECMSANJ0QWSA14Q99RFf wPD 6 <br />