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I Ificroxveu c SACRAMENTO ' 4 . 0 SOIL-VAPOR EXTRACTION SYSTEM The soil-vapor extraction system (SVE) consists of the four ' previously described soil-vapor extraction wells, the soil-vapor extraction blower and associated equipment, and the discharged vapor treatment system. The layout of the SVE is presented in Figure 4 . Permission to operate the system was granted by the ' San Joaquin County Air Pollution Control District (SJCAPCD) on April 5, 1991. SJCAPCD granted Pacific Bell an exemption to ' permitting requirements due to the boiling point of diesel being greater than the 302° F specified in Rule 409 . 9, Section D, Item 2 of the SJCAPCD permitting requirements. The letter from the ' SJCAPCD is included as Appendix D. 4 . 1 Soil-Vapor Extraction Wells ' The soil-vapor extraction wells were installed as previously described. For the installation of the SVE, the locks and plugs were removed from the three four--inch ID wells. The wells were connected to the extraction blower using two-inch ID, black ADS pipe. The piping was interconnected using slip-on connectors. The piping was configured to allow a vacuum to be induced in each ' well independently or in any combination of wells. Two-inch ball valves, to allow each well to be either isolated or connected to the SVE, and pitot tubes, which were connected to magnehelic ' differential pressure gauges to permit the accurate measurement of air flows and velocities, were installed in each of the lines fleading to the wells. The two-inch ID soil-vapor extraction well, EW9 , was used only as an observation well and was not ' connected to the extraction blower. 4 .2 Soil-Vapor Extraction Blower ' The soil-vapor extraction blower consists of a 220-volt 105 standard cubic feet per minute (scfm) blower, an explosive gas dilution valve, a dehumidifying chamber, a flow controller, pressure and temperature gauges, and sampling ports. The blower ' 10