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CLEARWATER <br />' G R O U P [ N C <br /> Envoronmenta! Services <br />' a Monitoring date Influent/effluent sampled on 1120/99,2124/99, and 3122199 <br /> a Operational Hours 1,280 hours this period and 3,241 to date <br />' a Sys up time this period 87% <br /> G Influent air flow rate 125 scfm(1/20199) to 155 scfm(2124/99) <br /> a Influent air TPHg 1,200 mg/m3 (3122199) to 5,100 mg/m3(1120199 and 2123199) <br /> Effluent air TPHg <I0 mg/m3 (1120,99 and 2/23/99)to 18 mg/m3 (3122199) <br /> a Destruction efficiency >93% (3/22199) to>99% (1/20/99 and 2/23199) <br /> TPHg recovery rates 18 lbs/hr(3/22/99)to 2 7 lbs/hr(2123199) <br /> a Total TPHg recovery 2,850 lbs (467 gal) this period and 6,287 lbs (1,031 gal) to date <br /> Operating wells VW-1 to VW-4,MW-1,and RW-1 <br /> Analytes tested TPHg and BTEX <br /> a Analytical methods EPA Methods 8015 (modified)and 8020 <br /> O Laboratory Entech Analytical Labs,Inc ,Sunnyvale,CA(CA FLAP#2224) <br /> • The TPHg recovery rate is baked on analytical influent ait sample iesults and concurrently measured air flow <br /> The average Z PHg iecovery rate for each month is multiphea by hours of operation for that period to calculate <br /> TPHg removal for the period between each sampling event <br /> Effluent air stream sainple results and operational data indicate that the catox unit is operating within compliance <br /> of the SJVIJAPCD PTO permit#N-3868-1-0 <br />' 3.2 Operational Data -- Air Sparge System <br /> Two air sparge wells (SW-1 and SW-2) are used to inject air into groundwater for the purpose of both <br /> volatilizing and enhancing aerobic biodegradation of dissolved-phase hydrocarbons Hydrocarbon vapors <br /> removed from the groundwater are recovered and treated by the SVE system The air sparge system is <br /> configured to deliver air to the subsurface via the two sparge wells for 15 minute intervals every six hours at a <br />' pressure of 3 psi <br />' 3 3 System Status -- Soil Vapor Extraction and Air Sparge System <br /> The SVE system is currently configured to extract vapor from wells VW-1 through VW-4, MW-1, and RW-1 <br />' The catox is operated 24-hours per day As noted above, the air sparge system is operated at 15 minute intervals <br /> • every six hours throughout the 24-hour day <br /> D-107 1Q99 GW& Sys Mon Report 4 Apnl 5, 1999 <br />