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HCL concentrations in vapor emissions were modeled for various <br /> distances from the catalytic oxidizer. A 1.29 lb per day VOC emission rate <br /> was utilized as the basis for modeling calculations. Each model run was <br /> performed for two discharge temperatures; 300 degrees Fahrenheit (F) <br /> and 600 degrees F. Finally HCL emissions were calculated only for a no <br /> building downwash scenario as discussed with SJUAPCD. In addition, <br /> each modeling run incorporated the following inputs: <br /> Source Type: Point Source <br /> Stack Height: 25 feet <br /> Stack Inside Diameter: 4 inches <br /> Stack Exit Velocity: calculated for each model run <br /> Ambient Air Temperature: 68 degrees F <br /> Receptor Height: 6 feet <br /> Geography: Rural <br /> Meteorology: All windspeeds and directions <br /> Terrain Height Above Stack Base: 0 feet <br /> Building Height: 20 feet <br /> Potential receptors nearest the Treatment System include a trailer park <br /> located to the north-northeast, residential areas located to the west and <br /> southwest, and industrial facilities located to the north and northwest. <br /> The vapor discharge stack will be approximately 25 feet high, and will <br /> therefore extend above the top of the Engine House. As such, building <br /> downwash will not have an effect on hydrochloric acid emissions. The <br /> model indicates that for discharge temperatures of 300 degrees F and <br /> 600 degrees F, the HCL emissions will be 3µg per cubic meter and 5µg per <br /> cubic meter, respectively. Therefore, receptors at the trailer park, <br /> residential areas, and industrial facilities will not be adversely affected by <br /> hydrochloric acid emissions. <br /> Soil Vapor and Ground Water Monitoring Objectives <br /> Objectives for soil vapor and ground water monitoring are discussed <br /> below. <br /> 4-11 <br />