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Data Interpretations <br /> Data interpretation for IBR capacity for ground water at Sites #1 and #2 is <br /> provided below <br /> Intrinsic Bioremediation: Geochemis4y and Capacity <br /> The aquifer geochenucal and IBR data for Site #1 are presented in Tables <br /> 3-1 and 3-2, respectively, and those for Site #2 are presented in Tables 3-3 <br /> and 3-4 The concentration changes of electron acceptors and metabolic <br /> by-products for ground water at both sites clearly indicates the presence <br /> of adequate IBR activity <br /> At the subject sites, the native IBR was supplemented in October 1996 <br /> with oxygen releasing compounds (ORC) to enhance intrinsic chemical <br /> degradation On 10 October 1996, baseline IBR-parameter measurements <br /> were collected from all monitoring wells at both sites prior to the <br /> placement of ORC socks Measurements for IBR parameters at all <br /> morutoring wells continued thereafter concurrent with the routine ground <br /> water monitoring events Geochemxcal trends and observations made <br /> concerning the ground water of both subject sites are provided below <br /> i The chemical impacts to the ground water within the Site #1 plume <br /> indicate low concentrations of TPHg constituents are present (benzene <br /> concentration of up to 0 079 milligrams/liter [mg/1]) near the former <br /> UST area For the purpose of IBR capacity estimation monitoring wells <br /> in this area were used as "source area" wells <br /> i Sirrularly chemical impacts to the ground water within the Site #2 <br /> plume indicate low concentrations of TPHg constituents are present <br /> (benzene concentration of up to 013 mg/1) near the former UST area <br /> For the purpose of IBR capacity estimation monitoring wells in this <br /> area were used as "source area" wells <br /> k <br /> 0 Nitrate concentrations are high upgradient of the source (in the <br /> baseline IBR sampling event [10/96 event]), where they are continually <br /> replenished due to fresh ground water influx and where they are not <br /> consumed by IBR activity As expected, the source concentrations in <br /> the plume are significantly lower as a direct result of the IBR activity <br /> o Manganese (II) and Iron (II) concentrations are low upgradient of the <br /> f source (in the baseline 1BR sampling event [10/96 event]), where their <br /> f ` oxidi/ed states aze not seduced from lack of petroleum hydrocarbon <br /> IBR activity Comparatively, they show high source concentration <br /> A-4 <br /> 1 <br />