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SJVAPCD September 12,2003 Authority to Construct/Permit to Operate Page 2 SOIL VAPOR EXTRACTION AND ABATEMENT The King, Buck/Hasstech, 200 scfm catalytic oxidizer units incorporate a 7.5 hp blower each (rated at 200 scfm maximum @ 4" Hg) to extract petroleum laden soil vapors from wells VW-1, VW-3, VW-4, VW-6, VW-7, VW-8, VW-11, VW-12, VW-13, VW-14, VW-16, and MW-2 through MW-9 (Figure 2). The proposed oxidizer units have similar configuration with exceptions of electrical requirements and manufacturer of blower. The oxidizer with serial number 9230 operates under single phase electrical requirements with a Tuthill blower while the other oxidizer with serial number 9321 operates under three-phase electrical requirements with a Sutorbilt 4M blower. The SVE systems will be operated under catalytic mode to treat the soil vapors prior to discharge to the atmosphere. A process flow diagram illustrating the operation of these two units is presented in Figure 3. Equipment specifications are presented in Appendix B. Pertinent equipment specifications for both the units are listed below: Parameter Oxidizer with Sl. No. 9230 Oxidizer with SI. No 9321 Blower Make Tuthill Sutorbilt 4M Blower Capacity 200 cfm 200 cfm Electrical Requirement Single Phase, 7.5 hp Three Phase, 7.5 hp Stack Height 10 feet above ground 10 feet above ground surface surface Stack Inner Diameter 5-inches (circular) 5-inches (circular) Destruction Efficiency 95 —98 percent 95—98 percent Distance to Nearest Approximately 20 feet Approximately 20 feet Station Building Height of Nearest Station Approximately 12 feet Approximately 12 feet Building A soil vapor extraction pilot test was conducted at the site in October 1991 extracting soil vapors from wells VW-1 through VW-4. During the test, influent total petroleum hydrocarbons as gasoline (TPHG) concentrations ranged from 130,000 milligrams per cubic meter (mg/m3) to 160,000 mg/m3' A radius of influence of 35 feet was estimated during this test. PABA-Arco for URS\6100\C=espondwce\Arco 6100 ATC appticationAm