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u <br /> within the plume area as they undergo reductive dissolution due to <br /> ongoing IBR activity <br /> Heterotrophic plate counts indicate generally elevated levels of <br /> microbes especially after induction of ORC program The plate counts <br /> are in the range of 10,000 and 1,000, respectively, and indicate a <br /> healthy microbial population <br /> ® Estimated IBR capacity of the ground water flowing through the Site <br /> #1 and Site #2 is presented in Table A-1 The IBR capacity value of 2 4 <br /> mg/I and 3 2 mg/1 for Site #1 and Site #2, respectively, represents the <br /> petroleum hydrocarbon biodegradation potential feasible by "natural <br /> attenuation processes" with one pore flush of the aquifer This <br /> represents the ability of naturally occurring organisms within the site <br /> aquifer to mineralize dissolved-phase petroleum hydrocarbons <br /> concentrations ranging form 2 3 to 3 2 mg/1 <br /> U The above-reported values are a low end estimation of the overall IBR <br /> capacity, as the IBR-capacity contributions from sulfate could not be <br /> estimated due to lack of data <br /> o Since the initiation of ORC-sock IBR enhancement program, the <br /> • geochemical trend have changed, as anticipated Therefore, the <br /> estimation of intrinsic (or native) bioremediation capacity was not <br /> possible for the subsequent monitoring events <br /> I� <br />! A-5 <br /> 3 <br />