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1 <br /> 1 <br /> IkIeFr <br /> 6 1►,,II�INC. SACRAMENTO <br /> 1 is capable of inducing a vacuum equivalent to 30 inches of water. <br /> Flow rate (and induced vacuum) is controlled by a gate valve flow <br /> controller. The flow may be read in either scfm or amperes drawn <br /> by the blower. During the pilot study Versar used only the <br />' ampere scale due to the non--linear response of the scfm scale. <br /> Figure 6 presents a detailed schematic diagram of the blower <br /> system and the technical specifications are included as <br />' Appendix E. <br /> 4. 3 Discharged Vapor Treatment System <br /> The discharged vapor treatment system was installed to <br /> remove the volatile organic contaminants from the SVE emissions <br />' before release to the atmosphere. The system consisted of two <br /> 55-gallon drums each containing 200 pounds of activated granular <br />' charcoal. The drums were connected to the SVE in series to <br /> prevent the possibility of emissions to the atmosphere if the <br /> carbon in one drum were to become saturated. Sampling ports were <br /> installed between and after the drums; and the exhaust vent from <br />' the drums was situated 15 feet above ground surface. <br /> 4 .4 Soil-Va or Extraction System Operation <br /> The SVE system was in place for a total of 89 days and <br /> operated on a cyclical basis. The system was allowed to operate <br />' for approximately seven days followed by a recovery period of two <br /> or three days. The cyclical operation was used to allow the soil <br /> pore space to recharge with volatile organic components after the <br /> soil pore concentrations had been reduced by the SVE. The system <br /> was operational for a total of 66 days with the longest operating <br />' period being 14 days and the shortest being 2 days. <br /> 4 . 5 System Monitoring Methods <br /> Operational data such as system amperage, system <br /> backpressure, static vapor pressure (vacuum) , air flow <br /> 1 <br />' 11 <br />