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Y _ CL EARATER G R O U 'P, P N C. ' EnDirnn mCntal SE rDiCCS Initial Stem Operation and Monitoring. On September 28, 1998, the SVE system was started for initial source testing. Clearwater and SJVUAPCD personnel were present. The air sparge system delivered air to the- two sparge wells for fifteen minute intervals approximately every four hours at a pressure of 3psi. Soil gas was extracted from all,seven wells noted above (Figures 2 and 3). The manual air dilution valve to the catalytic oxidizer was open approximately 10%. The influent air stream entered the catalytic oxidizer at a temperature of 675°F and at a rate of 152 scfm. The system is configured.such that soil gas will not be'introduced to the catalyst until the process air stream has attained a minimum temperature of 650°F. Process air exited the catalytic oxidizer at a temperature of''l,035°F (the system automatically shouts down if the exhaust temperature exceeds 1,150°F). Air samples were collected from both the "influent" and "effluent" sample ports using Tedlar bags (Figure 3). The samples were labeled, documented on a chain-of-custody form, and stored in a dark container for transport to the project laboratory. The samples were analyzed by Entech Analytical Labs, Inc., a DHS-certified laboratory located in Sunnyvale, California, for concentrations of total petroleum hydrocarbons;as gasoline (TPHg), and benzene, toluene, ethylbenzene, and xylene isomers (BTEX) by EPA.Methods 8015 (modified) and 8020. Initial System Monitoring Results The results of initial monitoring indicate that electric catalytic oxidizer achieved a hydrocarbon destruction efficiency of>97%. TPHg concentrations in the influent and effluent air samples were and 370 mg/m3 and <10 mg/m3, respectively. :Based on these data and flowrates, the system recovered TPHg from the subsurface at a rate of 5 lbs/day, and the TPHg emission rate_following treatment was <0.15 lbs/day. Thus, system operation complies with the conditions in the Authority-to-Construct permit. System Status Clearwater intends to restart the system for and extended period of remedial operation. The system is will be operated in essentially the same-manner;;as that during start-up.testing,.except.for..minor e ongoing adjustment to enhance contaminant rcovery rates and maintain appropriate system operational parameters over time. The system•will be operated such that it complies with all Mr. Craig Mitchell, S]VUAPCD 2 October 1, 1998