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I <br /> 04 December 1997 <br /> AGE-NC Project No 95-0128 <br />' Page 4 of 5 <br />' ppm and 4 9 ppm, and Iron was detected at 0 97 ppm and 1 8 ppm in the samples, respectively The <br /> Iron concentration is well below the 10 ppm that may cause fouling of sparge points during air <br /> sparging <br /> I <br /> 3 2 3 Bio-Enumeration and Physicochemical Analyses <br />' The same samples analyzed for manganese and iron content were analyzed for bio-enumeration and <br />' physicochemical characterization by A Keith Kaufman, M S It was found that the two samples <br /> contained extremely low microbiological populations, although a few selective biodegraders were <br /> detected in sample MW4/10-30-97 Both water samples were found to lack detectable concentrations <br />' of ortho-phosphate, a vital nutrient to support a microfauna for bioremediation Under the present <br /> circumstances, natural attenuation by bioremediation is not likely to occur <br /> 4 0 CONCLUSIONS AND RECOMMENDATIONS <br /> 41 CONCLUSIONS <br /> The following conclusions were drawn from the results of monitoring this quarter <br />' 0 The highest concentration of detected dissolved hydrocarbons quantified as TPH-g and <br /> overall BTE&X compounds remain in the vicinity of vapor well VW-1, located at the <br />' western edge of the dispenser island <br /> • Concentrations of hydrocarbons (and MTBE) decreased in well MW-5 between July and <br />' October 1997 <br /> • it is probable that well MW-7 still delineates the western, up-gradu.nt edge of the dissolved <br /> TPH-g and BTE&X plume, however, it appears that MTBE has diffused up-gradient beyond <br /> MW-7 <br /> • The decrease in concentrations of dissolved hydrocarbons in well MW-5 indicates that the <br /> di.Jolved hJ/dro_a, on plume l0 not stable oL haJ mlgraced nVrthw off the J1- .V <br /> delineate the dissolved hydrocarbon plume off-site and determine plume stability, additional <br />' down-gradient wells will be required <br /> • Due to the lack of significant biodegrading microorganisms and less than detectable <br />' concentrations of organic-phosphate, natural attenuation of the petroleum hydrocarbons <br /> through biologic activities is not likely to be occurring <br /> • The low concentrations of dissolved iron in the ground water is not likely to cause fouling <br /> Adiamed GeoFnN uonmental Inc <br />