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4 4 Remediation System Monitoring <br /> 4.4.1 Objectives of Remediation System Monitoring <br /> The primary objective of the Jamar Property C-SpargeTM operation is to reduce the mass of <br /> contaminants in the saturated and unsaturated zones in a technically effective but also cost <br /> effective manner In order to evaluate the reduction of mass, the objectives for monitoring the C- <br /> SpargeTM System at the Jamar property are listed below <br /> ■ Quantification of the volume of 03 infected and infection pressures maintained, <br /> ■ Quantification of the system operation time, and <br /> ■ The overall effectiveness of the C-SpargeTM remediation system as monitored by two <br /> indicators <br /> 1 VOC reduction in individual on site groundwater monitoring wells based on <br /> laboratory analysis, <br /> 2 Dissolved oxygen (DO) readings in groundwater grab samples from individual <br /> monitoring wells <br /> ■ The cumulative mass of contaminants removed from the dissolved phase for the site over <br /> time as monitored by changes in concentration and/or areal extent in map view <br /> ■ The overall effectiveness of the C-SpargeT remediation system as monitored by one <br /> additional indicator added during 4th Quarter 2004 <br /> 1 Oxidation-reduction potential (ORP) field determinations on groundwater grab <br /> samples ORP conditions over 300 millivolts (mV) usually indicate the presence <br /> of gaseous 03 <br /> ■ After significant reduction of MTBE, the quantification of the <br /> 1 Overall contaminant mass destruction rates (i e , removal efficiency) for the site <br /> over time, and to the extent practical, <br /> 2 Contaminant mass destruction rates for the site with distance and direction from <br /> the injection wells over time <br /> [Note Reduction of benzene is expected prior to MTBE ] <br /> 4.4.2 Results of Remediation System Monitoring <br /> A summary of depth to water, groundwater elevation and groundwater flow has been described <br /> previously in this report (Table 1) Groundwater chemistry has been reported in Table 2 <br /> The depth to groundwater during the June 21-22, 2005 groundwater-monitoring event for all on- <br /> site wells (only) ranged from 63 78 to 64 52 feet bgs where measured The upper ozone diffusers <br /> were a minimum of 6 29 feet below the top of water during the June groundwater monitoring <br /> event <br /> • <br /> S 1268231QM repoM\2005 2ndQR doc 8 <br />