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CLEAWATER <br /> R O Se r <br /> Environmental Services <br /> 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 /> Whale 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 <br /> SUMMARY AND CONCLUSIONS <br /> Results from this quarterly monitoring event appear to confirm results reported from previous <br /> groundwater monitoring activities, that the contaminant plume is stable and delineated <br /> Contaminant concentrations appear to be highest in the in the area of monitoring well MW-5B <br /> PROJECT STATUS AND RECOMMENDATIONS <br /> Clearwater recommends continuation of groundwater monitoring contaminant concentration in <br /> wells MW-1 through MW-8 to confirm results reported herein and to determine contaminant <br /> concentration and distribution trends over the near future Clearwater recently submitted an <br /> addendum to the Corrective Action Plan to the State and San Joaquin County Water Quality <br /> Control Boards, and Underground Storage Tank Cleanup Fund (USTCF) in order to propose <br /> implementation of an enhanced bioremediation technology known as "iSOC", which diffuses <br /> oxygen directly into groundwater Clearwater will implement the iSOC system upon receipt of <br /> approval from the regulatory agencies Clearwater also recommends discontinuation of <br /> monitoring for MNA parameters because the results of the current and previous MNA <br /> monitoring indicate that conditions for biodegradation on the site are favorable <br /> ZB178C/4Qo3 Monitoring Rpt 13 January 29,2004 <br />