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VVZ' INC 1996 The dissolved oxygen concentration measurements were obtained from the monitoring wells during the last round of sampling The map suggests that dissolved oxygen concentrations are relatively low in the main portion of the estimated extent of the soil and groundwater hydrocarbon plume Outside the soil and groundwater hydrocarbon plume dissolved oxygen concentrations are relatively high This suggests that oxygen is being utilized by microbes in both the soil and groundwater at a greater rate in the area of the hydrocarbon plume than in the surrounding non-hydrocarbon-contaminated area With time the microbial action will continue to abate the soil and groundwater plume No attempt has been made to identify the potential rate of degradation by microbial action in both soil and/or groundwater at the site to determine when the site would attain soil concentrations of petroleum hydrocarbons that would be below regulatory action levels The groundwater treatment system operated for a period of approximately 18 months from September 1992 to June 1994 During this period the system is estimated to have extracted approximately 388,800 gallons of groundwater An average concentration of individual hydrocarbon constituents in the influent of the groundwater is estimated to be Constituent Average Concentration 11 Benzene 260 Toluene 83 Ethylbenzene 207 Xylene 350 Total Petroleum Hydrocarbon as Gasoline 4,150 Based on the known extraction volumes and average hydrocarbon constituent concentrations from the influent groundwater collected into the groundwater treatment system, the following volumes of petroleum hydrocarbon constituents are estimated to have been removed from the groundwater during the 18 month span of the system operation Petroleum Hydrocarbon Constituent Estimated Volume Extracted Gallons Total Petroleum Hydrocarbon as Gasoline 215 Benzene 012 Toluene 003 Ethylbenzene 009 Xylene 042 19150011 005 37