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k%j KLEI NFELDER 4.4.1 SYSTEM STARTUP t 4.4.1.1 Baseline Sampling Prior to starting up the pilot test system, baseline conditions will be recorded to establish a reference from which to gauge the effect of the ozone pilot testing. To establish groundwater concentrations of contaminants in the area, a groundwater sample will be taken from MW-DIS-1 at the beginning of the first day and analyzed for TPH, BTEX and DCA by EPA Method 8264. Protocol consistent with quarterly groundwater monitoring will be observed. In addition, 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 for pH, dissolved oxygen, salinity, conductivity, oxidation/reduction potential (ORP), and temperature. Changes in these parameters will be used to evaluate the presence and effect of ozone in groundwater in the vicinity of the pilot test well. 4.4.1.2 System Checkout and Preparation Prior to starting the ozone compressor, all well caps and traffic lids (as applicable) will be removed from the screens in MW-DIS-1, AS/SVE-1, AS/SVE-2, NP-1, NP-2, and MW-DIS-9. . Initial system operation 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. The checkout will continue with operation of the ozone generator independently for a short time and checking carefully for any leaks in the supply line with the ozone monitor. Each equipment item will then be thoroughly checked for proper operation, as evidenced by performance and the lack of excessive vibration or noise or presence of ozone in i the air. 4.4.1.3 Pilot Test Execution (Ozone Sparging) i 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) on the first day of operation. Regular system monitoring during the test will facilitate verification of anticipated sparging flow and pressure at the sparge wells. Dissolved concentrations of several indicators in the monitoring wells will be frequently monitored to provide an initial evaluation of the area of coverage of the ozone sparge system. These data will be used to calculate the sparge well radius of influence and the resiliency of the ozone. Gaseous ozone will be monitored at the outlet of each monitoring well immediately after startup of the system to ensure that excessive ozone is not escaping from the wells (see Section 4.5 for safety considerations). The pH, dissolved oxygen, salinity, conductivity, oxidation/reduction potential (ORP), and temperature in each of the monitoring probes will be measured after air sparging has been running for at least an hour. I 1228012002R476 Page l9 of 26 Copyright 2002 Kleinfelder,Inc. May 17,2002