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----------------- <br /> CLEARWATERTT <br /> degraders ratios range from 3:1 (MWESB ,tom Pa i s(AlWe-A) with larger populations of aerobic <br /> hydrocarbon degraders present in samples from the plume core wells and depleted populations at <br /> the plume perimeter. This supports the argument that ongoing aerobic bioremediation is <br /> occurring at the plume core. The total anaerobic heterotrophs to hydrocarbon degraders ratios <br /> range from 500:3 (MW-4) to 3:2 (MW-8). Electron receptor concentration analytical data and <br /> lowered DO concentrations indicate that anaerobic bioremediation processes are prevalent at the <br /> plume's center. Concentrations of ammonia are sufficient to support biological activity. . <br /> 2.3.8 Discussion <br /> Most MNA parameters and indicators appear favorable for bioremediation. It should be noted <br /> that field measurements of DO, pH and conductivity were collected after the wells were purged <br /> and sampled so values obtained would reflect aquifer conditions surrounding the sample point. <br /> While heterotrophic populations indicate that favorable conditions exist for aerobic hydrocarbon <br /> degradation at the plume edges, the conditions seem to favor the slower anaerobic processes at <br /> the core of the plume. Results from this quarterly monitoring event appear to confirm results <br /> reported from previous groundwater monitoring activities, that the contaminant plume is stable <br /> and delineated. Contaminant concentrations appear to be highest in the in the area of monitoring <br /> =� well MW-513, <br /> 3.0 GROUNDWATER MONITORING AND SAMPLING—3 Quarter 2004 <br /> w.l <br /> Groundwater monitoring and sampling activities were conducted on September 7, 2004. <br /> Groundwater elevation data were obtained from each of the monitoring wells utilizing an <br /> electronic water level indicator. The water level indicator was thoroughly washed in an <br /> Alconox0 soap bath and double rinsed with clean tap water prior to placement in each well to <br /> prevent possible water quality influence from exterior sources, and to prevent cross <br /> r� <br /> contamination. Groundwater elevations were derived and are tied to previously established well <br /> surface elevation data (Tables I and 2). <br /> i=1 <br /> ZB178E iSOC System Installation/Start-up 9 Nov 24 04 <br /> ie= 229 Tewksbury Avenue ® Point Ricbmond,California 94801 P Telephone: 510-307-9943 ® Pax: 510-232-2$ <br />