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^ r L S Z 10 July 1997 AGE-NC Project No 95-0137 Page 3 of 4 6 � Microbiological analysis of water samples indicate that populations of indigenous hydrocarbon- degrading bacteria constitute a 5 2 percent proportion of total microbiological population at the site, furthermore, the total microbiological population is low tThe law concentrations of hydrocarbon-degrading bacteria at the site may be due low'concentrataons of nitrogen, both oxidized and reduced and a low level of phosphate The total colony units (CFU) ' bf the bacteria and the chemical composition of the ground water at the site appears to be inadequate for bioremediation, without the addition of nutrients Results of the microbiological and physicochemical analysis are included in Appendix C , 4 0. CONCLUSIONS AND RECOMMENDATIONS 41 CONCLUSIONS ,< Based upon data collected during'the June 1997 monitoring, AGE concludes the following The highest concentration of dissolved hydrocarbons' continues to be in-the area of monitoring well MW-2, located near the northern edge of the site The trend of benzene in samples collected from monitoring well MW-2 is depicted in Benzene Otiei Time included ' in Appendix D • Detectable concentrations of TPH-g increased in a majority of the�'Nells over the last quarter Monitoring wells MW-4 and MW-5 had an increase of TPH-g above the detection limit ' y BTE&X concentrations also increased in monitoring wells MW-1 and MW-2 Additionally, BTE&X compounds were detected in monitoring well MW-5 The trend of TPII-g in samples collected from monitoring well MW-2 is depicted in - TPH-g Over Time included ' in Appendit D r • Between March and 1997,TPH-d concentrations decreased or remained stable in wells MW- 2, MW-3 and MW-5, however TPH-d concentrations increased in wells MW-1 and MW-4 The trend of TPH-d in samples collected from monitoring well MW-2 is depicted 1,n TPH-d Over Time included in Appendix D h ' It appears that monitoring-well MW-4- is near the western extent of the dissolved hydrocarbons plumes Well MW-5 appears to be near the southeastern extent of the dissolved ' hydrocarbon plumes ' • Hydrocarbon-impacted ground water appears to extend northwest, north and northeast of the ' s foriner RFS UST area onto the Jimco Truck Stop property The lateral extent of the TPH-d • has not been determined east of MW-3