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.,. „r' 07 June 2002 AGE-NC Project No. 99-0645 Page 8of9 The catalatic oxidizer is outfitted with a heat exchanger to provide an effective destruction ratio at reduced concentrations of hydrocarbon vapor Supplemental energy(Le. electricity) will be utilized to maintain the optima] temperature for a maximum destruction rate of hydrocarbon vapors. AGE proposes to locate the VES unit near the northwest corner at the site (see Figure 4). This location will allow neighboring properties to conduct their day to day business without interference fi-om the operation of the VES unit. The VES unit will be secured by a chain-linked, gated enclosure with measurements 15 feet wide by 20 feet long and six feet in height. 4.4.1. Sol] Vapor Extraction Supplemental Energy The SVE unit is operated by electricity, which is readily available to the site. In addition, oxygen is added to the unit by an automatic air dilution module to adjust for optimal combustion. 4.4.2. Soil Vapor Extraction Monitoring Activities During the initial"start-tip"period for the SVE system(approximately one week), the VES unit will be monitored daily using a Dwyer DS-200 flow sensor and a a photo-ionization detector(PID). The Dwyer DS-200 flow sensor-will monitor operational parameters (air flow, combustion temperature, volume ofprocessed vapor,oxygen level and the lower explosive limits)to ensure optimal destruction of recovered hydrocarbon vapors. The PID will monitor the concentrations of hydrocarbon vapors from the influent and effluent ends of the VES unit to record before and after catalytic destruction. In addition, vapor samples will be collected on a daily basis fi•om the influent and effluent ends of the VES utilizing the vacuum pump on a Model 580A organic vapor meter (Thermo Environmental Instruments Inc.)-, the samples will be collected in Tedlar- bags, placed in a chilled container and transported under chain-of-custody procedure to a DHS-certified laboratory for analysis_ After start-up, the VES unit will be monitored weekly using the PID and Dwyer DS-200 flow sensor to ensure optimal destruction of recovered hydrocarbon vapors and to monitor cleanup progress. Vapor samples will be collected from the influent and effluent ends of the VES on a monthly basis; the vapor samples will be collected in Tedlar-bags and transported in a chilled container under chain- of-custody procedure to a DHS-certified laboratory for analysis. 4.5 SOIL VAPOR EXTRACTION SYSTEM MANTENANCE The SVE system will be mauntained on a weekly basis according to manufacturers recommendations After stabilization,routine maintenance would represent the only periods of"down time" for the unit. .Advanced GeaEnvirunmental,Inc.