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Mr.Michaoi J.Infuma,Jr.,Senior IZE •.- Former Canteen Facility October 15,2007 f Page 3 REMEDIATION SYSTEM OPERATIONS AND MONITORING Delta has installed and operated an approved soil and groundwater remediation system at the site under the following timeline: Feb-Mar 2004: A remediation system was installed at the site as indicated by the layout on Figure T. The system consisted of air sparging (AS) in conjunction with soil vapor extraction (SVE). Initially; a trailer-mounted internal combustion engine (ICE) unit, .which also destroyed hydrocarbon vapors recovered from the subsurface, provided vacuum for the SVE system. SVE system operations were initiated in March 2004. Aar 2005: Operations of the AS-SVE Remediation System were suspended and the ICE unit was removed while an updated Authority to Constn ict application was prepared and submitted to the SJVAPCD. Dec 2005: Began installation of an upgraded configuration, which included an AS-SVE skid system, with vapor treatment via thermallcatalytic:oxidizer. This configuration was selected to increase the capacity of the SVE flow rates, and in turn, allow full operation of all existing SVE wells. With all five SVE wells in operation, AS operations could be increased and would facilitate the completion of the site remediation objectives. Jan 2006: Operations of the upgraded system were initiated. All five vapor extraction (VE)wells were put into operation with the newer, larger-capacity equipment. t . i Sea 2006: The AS-SVE System was strut down pending another'Modification Application to the SJVAPCD. The modification proposed removing the oxidizer unit and replacing it with granular-activated carbon (GAC) E vessels. Each vessel holds a total of 400 lbs of GAC and will be changed-out as necessary. Nov 2006: Operations of the AS-SVE System with GAC vessel treatment was initiated on November 8, 2006. i Each GAC vessel holds a total of 400 lbs of GAC and will be changed-out as necessary. Jan-Mar 2007: AS-SVE operations, with vapor abatement via the GAC vessels, continued. The.'system uptime for this quarter was 92.6%. Azar-Jun 2007: AS-SVE operations' with vapor abatement via the.GAC vessels, continued. The system uptime for this quarter was 93.8%, with minor down-time awaiting carbon change-outs. Jul-Seo 2007: AS-SVE operations, with vapor abatement via the GAC vessels, continued. The system uptime for this quarter was 91,4%,with minor down-time awaiting carbon change-outs. i SVE System Operations The current operations of the AS-SVE Skid continued, with operations and monitoring (O&M)activities for the { AS-SVE remediation system conducted weekly. The weekly O&M activities included the following: • Inlet Manifold Vacuum, Flow, and PID Readings Blower Vacuum 3 Check, Clean, and/or Replace the Inline Filter(as necessary) + Exhaust Temperature and PID Readings • Adjust Ambient Air Control Valve(as necessary) - • Hour Counter in Control Panel t The following table summarizes the operating parameters of the system during this quarter. ' i Vacuum Levels Total Well Flow HC Concentrations HC'Concen#rations 3V.E rn ,w.c scfiglL1 .. . _ my :Walls .Min Maxi Min Max' Min : Max. Mip n Max.` f All 51 52 102. 151 43.3 114 26.2 10.0 Further details of recorded system data and operating parameters are summarized.in Tables 3,4,and S. E Minor system down-time was experienced in June 2007, due to a gap between carbon delivery and the ` technician's site visit due to scheduling differences. N li Hvdrnr_arhnn Vnnnr Mrnilnrfnn �_m '-_ . ._ _ - -