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RECEPTOR EXPOSURE CALCULATIONS <br /> FOR HYDROCHLORIC ACID <br /> Assume: Flowrate = 225 scfm = 324 acfm® 30OF <br /> Hydrochloric Acid concentration = 42 ppmv (maximum loading) <br /> Allowable hydrochloric acid concentrations in air = 7.0 ugim'3 <br /> Assumes no building downwash. <br /> Model: SCREEN3 <br /> Assumes as a basis: flowrate of HCl of 1 g/s <br /> Name of Run: Tracy VOC Remediation System - Hydrochloric Acid#5 <br /> BASIS: Concentration Concentration Concentration <br /> Concentration of HCI at the of HCl at the of HCl at the <br /> of HCl at the receptor, based receptor, based receptor, based <br /> receptor, based on 1.29 lb/day on 1.0 lb/day on 0.5 lb/day <br /> Distance on 1.0 g/s (0.0067 g/s) (0.0052 g/s) (0.0026 g/s) <br /> (meters) I (u m'3) I (u m'3) I (ug/m'3) lug/m'31 <br /> 1 clif 0 0 <br /> 10 0 0 0 0 <br /> 20 142 l 1 0 <br /> 30 379 3 2 1 <br /> 40 542 4 3 1 <br /> 50 623 4 3 2 <br /> 100 753 5 4 2 <br /> 200 730 5 4 2 <br /> 300 629 4 3 2 <br /> 400 478 3 '- 1 <br /> 500 365 2 '- 1 <br /> 1000 236 2 1 1 <br /> 2000 146 1 1 0 <br /> =000 95 I 0 0 <br /> -1000 691 01 01 Oil <br /> X000 53 01 01 ill <br /> Note: these calculations are alid, using assumptions provided on attached <br /> modeling print out: Tracy VOC Remediation System - Hydrochloric acid #5 <br /> uipublicitouctuitracyiairrnodci/SCRUBBER.XLSiRun R5 Page 2 12122.'97/10:45 AM <br />