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kNj KLEINFELDER 4.3.1 SYSTEM OPERATION 4.3.1.1 Baseline Sampling Prior to starting up the air sparging, baseline conditions will be recorded to establish a reference from which to gauge the effect of the testing. To establish groundwater concentrations in the area, a groundwater sample will be taken from MW-DIS-1 and analyzed for TPH, BTEX and DCA by EPA Method 8260. Protocol consistent with quarterly groundwater monitoring will be observed. To establish dissolved oxygen concentration in the area, dissolved oxygen readings will be taken in each of the screens to the extent possible in MW-DIS-1, AS/SVE-1, AS/SVE-2, NP-1, NP-2, and MW-DIS-9. To establish the baseline gas concentration in the vent well, the well will be purged and a reading taken with the PID. Two well volumes will be purged before sampling the well. 4.3.1.2 System Checkout Initial operation and maintenance will consist of a thorough system checkout followed by a systematic startup. Checkout will consist first of an electrical checkout to ensure proper wiring and power supply to the system. Activating the primary element of the interlock and recording the effect will test interlocks and shutdowns. This checkout will be documented. The checkout will continue with operation of the extraction blower independently for a short time and checking for proper rotation and power supply. Each equipment item will then be i thoroughly checked for proper operation, as evidenced by performance and the lack of excessive vibration or noise. Only when each component is functioning effectively will the entire system be operated. 4.3.1.3 Pilot Test Execution(Air Sparging) Once appropriate systems checkouts have been performed the pilot test will begin operation. The test will involve performing frequent monitoring and sampling of operation parameters (i.e., concentrations, flows, and pressures). Regular system monitoring during the operating period will facilitate verification of the anticipated venting flow and pressure at the vent and sparge wells. Vacuum changes in the monitoring probes will be frequently monitored to provide an evaluation of the area of coverage of the pilot system. The pressure levels in each of the monitoring probes will be measured after the system has been running for at least an hour. The dissolved oxygen in each of the monitoring probes will be measured after air sparging has been running for at least two hours. The monitoring protocol is described in Section 4.3.2. 12280/2002R476 Page 14 of 26 Copyright 2002 Kleinfelder,Inc. May 17,2002