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Former Canteen Facility January 13,2005 Quarterly Groundwater Monitonng Report Page.S flow readings from the ICE unit The following table summarizes the operating parameters of the system during this quarter Vacuum Levels Overall Well Flow HC Concentrations Operating in. W.C. (scfm) ' Wells Minimum Maximum Minimum Maximum Minimum l Maxunum VE-1 & VE-3 27 68 26 j 40 6,500 i 8,400 I The ICE unit operated with total flows that vaned from approximately 40 to 44 standard cubic I feet per minute (scfm) ICE unit operations were supplemented with liquid propane gas (LPG), to assure efficient operations LPG consumption vaned from approximately 163 to 175 scfm or 2 7 to 2 9 gallons per hour (gph) Further details of recorded system data and operating parameters are summarized in Table 3 HYDROCARBON VAPOR MONITORING Influent and effluent vapor concentrations from the ICE unit were measured weekly using a photo-ionization detector (PID) During flus period of operation, oxygen (02) and carbon . dioxide (CO2) influent levels were also monitored periodically Generally speaking, OZ levels increased and CO2 levels decreased during this monitoring period During the first weekly O&M visit each month, influent and effluent vapor samples were collected in Tedlar bags These samples were express-delivered to McCampbeIl Analytical, Inc in Pacheco, California for analysis of TPH(g) and BTEX/MTBE concentrations via Modified EPA Methods SW846-8015G and SW846-8021, respectively The destruction efficiency of the ICE unit vaned from 87 0 to 99 8 percent (%) The analytical results are summarized in Table 4. I Hydrocarbon (TPH/VOC) recovery rates primarily varied from 2 745 to 4 775 pounds per hour (lbs/hr) during this monitoring period In addition, hydrocarbon vapors in excess of 19,000 pounds (3,000 gallons) have been recovered and treated by the ICE unit, as summarized in I Table 5. The hydrocarbon recovery rates and cumulative hydrocarbon recovery are illustrated in Graph I AIR SPARGING OPERATIONS Air sparging (AS) operations were initiated for a short time in June 2004, but were shut down due to ICE emissions compliance issues Operations of the AS System were re-initiated on August 20, 2004 Since VE-1 and VE-3 are the only current SVE wells in operation, AS operations have been limited to the northern AS sections These sections cover AS wells AS-1 through AS-6 and are comprised of two AS wells each The delivery pressures have been approximately 4 to 5 pounds per square inch gauge (pstg), with flows varying from about 2 0 to 3 0 scfm for each section (-1 0 to 15 scfin per well)