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Geological Terknics Inc. Page 8 <br /> +— Additional Site Characterization <br /> And 1"Quarter 2004 Groundwater Monitoring <br /> Project No.425.2 <br /> March 22,2004 <br /> Parameter Source of the Background Pinme Plume <br /> Parameter Behavior Behavior <br /> Core Margins <br /> Nitrate' e Acceptor Slightly Enriclied Deple-t-eU— of ep ete <br /> Ferrous lroW M eta b o -cSlightly nr-c e -g t y of nuc e <br /> Byproduct Enriched <br /> Sulfate e"Acceptor Site Specific Slightly - y <br /> 'r Enriched Depleted <br /> einperature eta o -c -te pec- -c evate Slight <br /> Byproduct Elevated <br /> p eta b o I-c Site pec- -c Slightly Lower Sf ig t y <br /> Byproduct Higher <br /> Alkalmi!y7— eta o -c Site Specitic Enriched M- y <br /> Byproduct Depleted <br /> Redox Metabolic Negative Value ep ete`cT— Slightly <br /> Potential Byproduct Lower <br /> Conductivity— Metabo -c -tepec- -c evateT— Unaffecte <br /> +- Byproduct <br /> e = electron <br /> Terminal electron accepting process: <br /> 1 =denitrification <br /> 2 =reduction <br /> +� The test results showed the following; <br /> 1. MW-2, MW-3 and MW-5 have the highest levels of alkalinity measured at the site. <br /> Elevated levels of alkalinity are an indicator of benzene biodegradation, either aerobic <br /> or anaerobic. <br /> 2. MW-2, MW-3, MW-5 and MW-7 have a depleted nitrate as nitrogen constituent <br /> compared to the other water table wells, which is consistent with biodegradation in an <br /> anaerobic enviromnent. <br /> 3. MW-2 shows dramatically depleted levels of sulfate. The absence of nitrate as nitrogen <br /> in MW-2 may have caused a substitution of sulfate as the preferential biodegradation <br /> electron acceptor. <br /> i• 4. MW-2 shows a dramatically elevated level of iron suggesting the well is near the plume <br /> core. <br /> 5. Redox potential has been consistently lowest in MW-2 suggesting MW-2 is near the <br /> center of the plume (Table 4). <br /> 6. Dissolved oxygen measured at the site ranges from 0.02 to 1.63 ppm. The lowest <br /> measured levels are in MW-2 and neighboring wells. This suggests that MW-2 is at the <br /> core of the plume. It also suggests background dissolved oxygen levels are conducive <br /> to aerobic biodegradation. <br /> 7. The groundwater temperature at the site ranges between 71° and 76°F. <br /> 8. The measured pH in the water table wells range between 7.0 and 8.0. <br /> The test results showed the following trends when comparing the contaminated zone to <br /> background conditions. <br />