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Extracted Soil Vapor Treatment Objective <br /> VOCs in soil vapor extracted at dual phase extraction wells and SVE wells <br /> will be destroyed by catalytic oxidation. The catalytic oxidizer is designed <br /> for a greater than 95 percent destruction and removal efficiency (95% <br /> DRE) for VOCs in soil vapor. The treatment objective for soil vapor is <br /> tabulated in Table 4-5. <br /> TABLE 4-5 <br /> Extracted Soil Vapor Treatment Objectives <br /> Constituent Treatment System Inlet Treatment System Effluent <br /> VOC Concentration in Soil VOC Concentration in Treated <br /> Vapor Soil Vapor <br /> (>95% DRE) <br /> (ppmv) my <br /> cis 1,2-Dichloroethene 5.9 <0.3 <br /> 1,1-Dichloroethane 10.7 <0.5 <br /> Vinyl Chloride 97.3 <4.9 <br /> Benzene 0.3 <0.02 <br /> Total HVOCs 124.7 <6.2 <br /> Total AVOCs 10.6 <0.5 <br /> Hydrochloric Acid Emissions Modeling. Byproducts of catalytic oxidation <br /> of HVOCs include carbon dioxide, water, and hydrochloric acid (HCL). <br /> Emissions of hydrochloric acid are regulated by the State of California and <br /> must not exceed the applicable air quality standard of 7.0 micrograms per <br /> cubic meter at sensitive receptors. <br /> The site scenario for HCL emissions was discussed with Mr. Mike Maeda, <br /> an engineer with San Joaquin Valley Unified Air Pollution Control District <br /> (SJUAPCD). Based on these discussions, an air dispersion model (EPA- <br /> 450/R-92-019, "Screening Procedures for Estimating the Air Quality <br /> Impact of Stationary Sources, Revised") was utilized to evaluate HCL <br /> concentrations in treated soil vapor and the possible impacts of these <br /> emissions to nearby receptors. The dispersion modeling and results of <br /> modeling are included in Appendix A and are summarized below. <br /> 4-10 <br />