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7-27 Air Dispersion Modeling Report

Example calculations showing methodology for estimating ambient air impact levels

7-27     For the comparison to RIDEM APCR No. 22 Acceptable Ambient Levels that was included in Table 16, it is difficult to evaluate without example calculations showing methodology for estimating ambient air impact levels from each source for each pollutant for each period of comparison.  Please provide.

RESPONSE 7-27

 

Example calculation for annual 1-3-Butadiene:

 

GT/HRSG-1&2 (Natural Gas)

[2.92 x 10-4 lb/hr] x [453.6 g/lb] x [1 hr/60 min] x [1 min/60 sec] x [0.15676 ug/m3/g/sec] x [8,040 hrs/yr] / [8,760 hrs/yr] =  5.29 x 10-6 ug/m3

 

GT/HRSG-1&2 (ULSD)

[1.12 x 10-2 lb/hr] x [453.6 g/lb] x [1 hr/60 min] x [1 min/60 sec] x [0.14672 ug/m3/g/sec] x [720 hrs/yr] / [8,760 hrs/yr] =  1.70 x 10-5 ug/m3

 

Fire Pump

[8.21 x 10-5 lb/hr] x [453.6 g/lb] x [1 hr/60 min] x [1 min/60 sec] x [17.31881 ug/m3/g/sec] x [300 hrs/yr] / [8,760 hrs/yr] =  6.13 x 10-6 ug/m3

 

Total Impact: [5.29 x 10-6] + [1.70 x 10-5] + [6.13 x 10-6] = 2.84 x 10-5 ug/m3

 

RESPONDENT:

 

Michael Feinblatt, ESS Group, Inc.

 

DATE:

May 17, 2016