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I IFormer Canteen Facility October 15,2004 . Quarterly Groundwater Monitoring Report Pae 5 Iflow 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. ) - _ (se M Wells Minimum Maximum iuimum� Maximum Minimum Maximum VE-1 &VE-3 16 35 15 i 36 86 8,000 I The ICE unit operated with total flows that vaned from approximately 40 to 45 standard cubic feet per minute (scfm) ICE unit operations were supplemented with liquid propane gas (LPG), to assure efficient operations LPG consumption varied from approximately 1 65 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 this period of operation, oxygen (02) and carbon dioxide (CO2) influent levels were also monitored periodically Generally speaking, 02 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 McCampbell 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 varied from 80 3 to 99 8 percent (%) The analytical results are summarized in Table 4 ' Hydrocarbon (TPHNOC) recovery rates primarily varied from 1 389 to 4 6677 pounds per hour (lbs/hr) during this monitoring period The only exception to these rates was the September 24, 2004 sampling that indicated a recovery rate of only 0 047 lbs/hr A total of approximately ' 11,300 pounds (-1,800 gallons) of petroleum hydrocarbons have been recovered and treated by the ICE unit, as summarized in 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 SVE wells in operation, AS operations have ' been limited to the former tankpit area This area covers sparge wells AS-1 through AS-6 The delivery pressures have been approximately 4 to 5 pounds per square inch gauge (psig), with . flows varying from about 1 0 to 1 5 scfm per well