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h'q KLEINFELDER I conductivity, salinity and temperature in groundwater. The probe from the meter will be brought into contact with groundwater to take the necessary readings. Ozone Test Strips Ozone test strips will be used as an inexpensive way to measure gaseous ozone near monitoring wells. Each strip is chemically treated to react with ozone. For the pilot test, strips with a range of 0.075 to 0.105 ppm of ozone will be used. 1 Personal Ozone Monitor The personal ozone monitor is a simple personal monitoring device for measuring personnel's exposure to ozone at the site. Using specially treated paper the personal ozone monitor provides readings for short-term exposure (one hour), and average long-term exposure (eight hours). Readings range from 10 to 350 ppb. 4.3 SOIL VENTING AND AIR SPARGING 1 For the soil ventilation portion of the pilot test, the ventilation well will be piped directly to the SVE unit and equipped with a port to measure flow velocity, a valve to introduce dilution air for pressure/flow control and a port to measure concentrations. The SVE piping will then lead through a 50-gallon moisture separator (knockout drum), a particulate filter and then through the blower. The vent well is expected to reach a total flow of 35-70 scfm under normal operating conditions. Based on our experience with similar systems, the vent well will require 80-120 inches of water (in wc) vacuum to maintain the desired flow. The soil venting portion of the test will be operated for one day to correspond with the air sparging. The air sparging portion of the test will be performed simultaneous with soil vapor extraction to evaluate the air stripping influence of the sparge well. Sparge air flowrates are typically set at or less than 50% of vent capability to prevent sparged air from escaping to the atmosphere before being collected by the venting system. It is expected that the flowrate maintained by the sparge well will be 8-10 scfm, which is less_ than 30% of venting system capacity and conservatively jwithin the desired factor of safety. This flowrate is sufficient to provide efficient stripping relative the vapor/dissolved exchange ratio, and low enough to minimize any initial mounding of groundwater that can create a temporary gradient away from the well and potentially push dissolved TPH/DCA away from the pilot system. Mounding typically occurs in the initial minutes of sparging and then dissipates when volumetric equilibrium between the resident sparge air and groundwater is reached. Kleinfelder will slowly increase the sparge flow to its operating rate to minimize mounding. It is expected that both of j the sparge well nests will be run simultaneously and continuously through the test period, but separate operation may be implemented to gather more specific radius of influence data relative to sparge depth. i 12280/2002R476 Page 13 of 26 Copyright 2002 Kleinfelder, Inc. May 17,2002