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Recommendations for Navarra Site June 2006 Page 2 of 2 <br /> 2. CLOSURE OF WELLS IN DEEPER AQUIFERS <br /> Proposed Action: Close Monitoring Wells MW-3A, 313 and 12A. <br /> Rationale: Deeper aquifers are hydraulically separate from near surface <br /> aquifer. Extensive monitoring has demonstrated that they are free <br /> of chemicals of concern. Unnecessary wells -in yard heavily- <br /> trafficked by trucks pose risk of contamination of pristine aquifers <br /> by fuel spills, which have occurred at the site-in the past. <br /> 3. MONITORING AND MANAGEMENT OF FLOATING PRODUCT IN MW-7 <br /> Purging Frequency: Semi-annually <br /> Next Round: July, 2006 <br /> Rationale: Current rate of accumulation of LNAPL in Monitoring Well MW- <br /> 7 does not justify purging more frequently than once every 6 <br /> months. <br /> 4. POTABLE WATER-QUALITY MONITORING <br /> Proposed Action: Discontinue potable water-quality monitoring <br /> Rationale: Deep formations from which potable water wells extract <br /> groundwater are hydraulically isolated from affected groundwater <br /> in shallow near-surface aquifer. Two years of quarterly sampling <br /> of potable water found no detectable concentrations of any <br /> analytes of concern. <br />