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ATTACHMENT A <br /> SOIL VAPOR FEASIBILITY TEST AND COMPUTER MODELING <br /> The results of the in-situ soil vapor extraction (ISVE) feasibility test performed on <br /> January 22, 1993, are presented in this attachment. <br /> The purpose of the influence test was to estimate the flow rate, and the radius of influ- <br /> ence of a vapor extraction system: These parameters will be used to determine feasi- <br /> bility of an ISVE remedial system. The objective of ISVE is to remediate hydrocarbon- <br /> impacted soils in the vadose zone and the permeable portion of the aquifer above <br /> groundwater through vapor extraction. <br /> ISVE Test <br /> One extraction probe (Probe 1) and two monitoring probes were installed by Pacific <br /> �.. Environmental Group, Inc. (PACIFIC) immediately prior to testing. The test was <br /> performed by connecting a 2.5 horsepower regenerative blower to the extraction probe <br /> and applying a vacuum. Pressure gauges were then placed on selected monitoring wells <br /> and probes. The applied vacuum, extracted soil vapor flow rate, and vacuum influence <br /> were monitored during the test. <br /> Two vapor samples were obtained during ISVE testing and analyzed for total <br /> petroleum hydrocarbons (TPH) and for the constituents benzene, toluene, ethyl- <br /> benzene, and total xylenes (BTEX compounds) by EPA Method 8015/8020. A <br /> Foxburo portable flame-ionization detector was also used to provide continuous data <br /> during the test. Certified analytical report and chain-of-custody documentation are <br /> included in Attachment B. <br /> The results observed are summarized below. <br /> Applied TPH <br /> Extraction Flow Rate Vacuum Concentration <br /> Point (scfm) (inches HZO) (ug/L) <br /> Probe 1 2 85 23,000 and <br /> 40,000 <br /> scfm = Standard cubic feet per minute,standard air <br /> TPH= Total petroleum hydrocarbons <br /> ug/L= Micrograms per liter <br /> 3100104/IRAP A - 1 March 18, 1993 <br />