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Groundwater Investigation and Associated Source Characterization
Table 7.4-6 - Calculated versus Exempted Emission Rates
| Chemical Compound | Soil gas conc. (ppmv) | Air Displacement (SCFM) | Molecular Weight (lb/lb-mole) | Calculated emission rate | L (mg/M3) | E - Exempted emission rate (lb/hr) | |
| (lb/hr) | (tons/yr) | ||||||
| TCE | 480 | 80 | 131.4 | 0.79 | 3.5 | 135 | 16.875 |
| DCE | 250 | 80 | 97.0 | 0.31 | 1.34 | 79 | 9.8750 |
| Vinyl chloride | 16 | 80 | 62.5 | 0.13 | 0.59 | 2 | 0.25 |
| The equation for estimating emission rate from the SVE is as follows: Chlorinated hydrocarbon emission rate (lb/hr) = (contaminant concentration) x (contaminants molecular weight in lb/lb-mole) x (air pump rate in cfm) x (1.581 x 10-7 lb-mole-min/ft3-ppmv-hr). For calculation of yearly emission rates, it was assumed that the SVE system will operate 24 hours a day, 7 days a week, 52 weeks per year at the 30 minute soil gas concentrations. | |||||||