Laserfiche WebLink
Stantec <br /> Quarterly Groundwater Monitoring Report and Remediation Progress Report Second Quarter 2008 <br /> ARCO Service Station No. 2130 <br /> August22, 2008 <br /> AS System Operation and Performance <br /> Equipment Inventory: Air compressor <br /> Time Operational this Quarter 1 , 682 .6 hours / 75% uptime <br /> March 24 , 2008 to June 25 , 2008) : <br /> Time Operational since Hour Meter Installed 11 , 568 . 0 hours / 95% uptime <br /> ( February 6 , 2007 through June 25 , 2008) : <br /> 5. 0 CONCLUSIONS AND RECOMMENDATIONS <br /> Stantec recommends continuing operation of the AS system and continuing with the current <br /> monitoring and sampling schedule for the site . In the Site Conceptual Model and Results of <br /> Additional Assessment, dated February 21 , 2008 , SECOR recommended initiating periodic <br /> oxygen injection into the AS wells ; this work will be initiated upon regulatory approval . A review <br /> of historical data shows that groundwater analytical concentrations have been low to non -detect <br /> for at least four consecutive quarters in wells MW-3 through MW -5 , MW-7 , MW- 11 , MW- 12 , <br /> MW- 14, and MW- 18. Based upon these observations , Stantec requests that the frequency for <br /> groundwater sampling be reduced in wells MW-3 through MW -5 , MW-7 , MW- 11 , MW-12 , <br /> MW- 14 , and MW- 18 from quarterly to semi-annually (first and third quarter) . <br /> Ott <br /> 67 <br /> d � <br /> 2130 QMR-QRPR 2Q08.doc 6 <br />