1. Quantification in TPY of back half source test emissions from the 

facility.

Based upon source tests conducted at Chester, the condensable PM loading at the inlet of 

the ESP is 0.004 gr/dscf, or 1.6% of the total PM.1

Estimated hourly and annual emissions for particulate fractions and types are shown in 

Table 1. Worst case emissions of total condensable PM2.5 at the stack with the wet ESP 

is about 2.2 lb/hr, or 9.49 TPY. Because the project will not result in a change in 

filterable PM emissions,2this represents the upper limit on the increase in total 

condensable PM2.5 emissions (i.e., it assumes 100% control by the wet ESP and no 

control by the dry ESP). A less conservative estimate would be that the increase would 

be 5.28 TPY of PM2.5, based on the measured control efficiency of the wet ESP, but still 

assuming zero control by the dry ESP. Both assumptions grossly overstate the expected 

change in PM2.5 emissions, and both assumptions indicate that the increase will be below 

10 TPY.

Table 1. Quantification of Back Half Emissions from Source Test Data

Pollutant Measured 

Emission 

Factor at ESP 

Inletc

Emissions at 

ESP Inlet

Measured 

Emission 

Factor at 

ESP Outletd

Emissions at 

ESP Outlet

Lb/MMBtu Lb/hra TPYb Lb/MMBtu Lb/hra TPYb

Condensable PM2.5

(Inorganic) 0.0047 1.13 4.87 0.0017 0.40 1.72

Condensable PM2.5

(organic) 0.0021 0.51 2.21 0.0013 0.32 1.37

Condensable PM2.5

(Impinger Rinse) 0.0023 0.56 2.41 0.0011 0.26 1.12

Total Condensable 

PM2.5

0.0091 2.21 9.49 0.0040 0.98 4.21

NOTES

a Based on 242.3 MMBtu/hr.

b Based on 242.3 MMBtu/hr and 8592 hours per year.

c See Table 2 for calculations

d See Table 3 for calculations

 

1 Back half (inorganic + organic + impinger rinse) emission rate = (0.0020 + 0.0009 + 0.001) gr/dscf = 

0.004 gr/dscf (See Table 2). Total PM emission rate = 0.2545 gr/dscf (2010 source test report p. 6). 

2 We believe there will be no increase in condensable PM as well; however, this analysis reflects a worstcase assumption.
Table 2. Bypass Stack Source Test Data—Back Half

Run #1 Run #2 Run #3 Average

Source of 

information

Back Half, 

Inorganic

Total residue 

less blank, mg 3.6 2.2 4.0 3.3 p.21

Total residue 

less blank, gr 0.056 0.034 0.062 0.050

Sample volume, 

dscf 34.729 31.176 32.977 32.961 p.16

gr/dscf 0.0016 0.0011 0.0019 0.0015

CO2 content 8.5 9.1 9.2 8.9 p.16

gr/dscf at 12% 

CO2 0.0023 0.0014 0.0024 0.0020

Emission Factor, 

lb/MMBtua 0.0052 0.0033 0.0056 0.0047

Back Half, 

Organic

Total residue 

less blank, mg 1.8 1.7 0.9 1.5 p.21

Total residue 

less blank, gr 0.028 0.026 0.014 0.023

Sample volume, 

dscf 34.729 31.176 32.977 32.961 p.16

gr/dscf 0.0008 0.0008 0.0004 0.0007

CO2 content 8.5 9.1 9.2 8.9 p.16

gr/dscf at 12% 

CO2 0.0011 0.0011 0.0005 0.0009

Emission Factor, 

lb/MMBtua 0.0026 0.0025 0.0013 0.0021

Back Half, 

Impinger 

Rinse

Total residue 

less blank, mg

1.8 1.9 1.1 1.6

p.21

Total residue 

less blank, gr 0.028 0.029 0.017 0.025

Sample volume, 

dscf 34.729 31.176 32.977 32.961 p.16

gr/dscf 0.0008 0.0009 0.0005 0.0008

CO2 content 8.5 9.1 9.2 8.9 p.16

gr/dscf at 12% 

CO2 0.0011 0.0012 0.0007 0.0010

Emission Factor, 

lb/MMBtua 0.0026 0.0028 0.0015 0.0023

NOTE a Emission factor, lb/MMBtu = E= Cw*Fc*100/%CO2 

 = (Emission rate, gr/dscf) / (7000 gr/lb) * (1920 dscf/MMBtu)*8100/12
Table 3. Wet ESP Outlet Test Data—Back Half

Run #1 Run #2 Run #3 Run # 4 Average

Source of 

information

Back Half, 

Inorganic Total residue, g 112.1738 107.3388 99.6090 110.3617 107.3708 pp. 62-65

Blank, g 112.1723 107.3364 99.6042 110.3602 107.3683 pp. 62-65

Total residue less blank, mg 1.4 2.4 4.8 1.4 2.5

Total residue less blank, gr 0.022 0.037 0.074 0.022 0.039

Sample volume, dscf 51.375 52.310 53.300 51.555 52.135 p.54

gr/dscf 0.0004 0.0007 0.0014 0.0004 0.0007

CO2 content 11.9 12.1 12.6 12.3 12.2 p.54

gr/dscf at 12% CO2 0.0004 0.0007 0.0013 0.0004 0.0007

Emission Factor, lb/MMBtua 0.0010 0.0016 0.0030 0.0010 0.0017

Back Half, 

Organic Total residue, g 97.8782 107.3201 70.8723 110.6555 96.6815 pp. 62-65

Blank, g 97.8764 107.3182 70.8702 110.6532 96.6795 pp. 62-65

Total residue less blank, mg 1.8 1.8 2.0 2.3 2.0

Total residue less blank, gr 0.027 0.029 0.032 0.035 0.031

Sample volume, dscf 51.375 52.310 53.300 51.555 52.135 p.54

gr/dscf 0.0005 0.0005 0.0006 0.0007 0.0006

CO2 content 11.9 12.1 12.6 12.3 12.2 p.54

gr/dscf at 12% CO2 0.0005 0.0005 0.0006 0.0007 0.0006

Emission Factor, lb/MMBtua 0.0012 0.0012 0.0013 0.0015 0.0013

Back Half, 

Impinger 

Rinse

Total residue, g 108.6405 109.1888 78.1648 112.8594 102.2134 pp. 62-65

Blank, g 108.6394 109.1869 78.1626 112.8580 102.2117 pp. 62-65

Total residue less blank, mg 1.1 1.9 2.2 1.4 1.6

Total residue less blank, gr 0.017 0.029 0.033 0.022 0.025

Sample volume, dscf 51.375 52.310 53.300 51.555 52.135 p.54

gr/dscf 0.0003 0.0005 0.0006 0.0004 0.0005

CO2 content 11.9 12.1 12.6 12.3 12.2 p.54

gr/dscf at 12% CO2 0.0003 0.0005 0.0006 0.0004 0.0005

Emission Factor, lb/MMBtua 0.0008 0.0012 0.0014 0.0009 0.0011

NOTE a Emission factor, lb/MMBtu = E= Cw*Fc*100/%CO2 

 = (Emission rate, gr/dscf) / (7000 gr/lb) * (1920 dscf/MMBtu)*8100/12
2. List of the fuels that are currently used by the facility.

The PSD permit limits fuel use in boiler No. 4 to “wood, bark, and wood residues.” The 

primary source of fuel is waste from the adjacent sawmill; other fuels include clean 

hogged fuel, wood, bark and wood residues, received from other sources. No change to 

these allowable fuel supplies is proposed.