OMB Control Number: 2040-0281 Plant ID: Insert Plant ID

Approval Expires: 05/31/2013 Plant Name: Insert Plant Name

Section Title Tab Name

Part B Instructions Part B Instructions

General FGD System Information Part B Section 1

Planned FGD System Information Part B Section 2

FGD Additive Information Part B Section 3

Wet FGD System Information Part B Section 4

FGD Solids Disposition and Marketing for Wet FGD Systems Part B Section 4 Tables

FGD Wastewater Generation Part B Section 5

FGD Monitoring Data Instructions Part B Section 6

FGD Monitoring Data Part B Section 6 Table

FGD Wastewater Treatment Part B Section 7

Dry FGD System Information Part B Section 8

FGD Solids Disposition and Marketing for Dry FGD Systems Part B Section 8 Tables

Part B Comments Part B Comments

Steam Electric Questionnaire Code Tables Code Tables

Steam Electric Questionnaire 

PART B - FLUE GAS DESULFURIZATION (FGD) SYSTEMS

Table of Contents

Approved: May 20, 2010
Steam Electric Questionnaire Part B. Instructions

Plant ID: Insert Plant ID

Plant Name: Insert Plant Name

PART B. FLUE GAS DESULFURIZATION (FGD) SYSTEMS

Use the Part B Comments tab to do the following: provide additional information as 

requested in certain questions within Part B; indicate atypical data (e.g., if 2009 

information is not representative of normal operations); and note methods used to make 

best engineering estimates in the event that exact data are not available.

Throughout Part B, information is requested on FGD systems that are under 

construction/installation or planned to be constructed/installed by December 31, 2020. 

Provide design information, or best engineering estimates as necessary, for these 

planned systems. 

As you are completing the electronic form, note the following: When you enter your plant 

name and plant ID on the Part B Table of Contents tab, all name and ID fields 

throughout Part B will automatically populate. Refer to the overall questionnaire 

instructions, the glossary, and the acronym list for assistance with completing Part B. 

INSTRUCTIONS

Part B requests information about flue gas desulfurization (FGD) systems that are 

located at the plant or are planned to be located at the plant. Complete Part B if you 

operate one or more FGD systems, or if you are currently constructing/installing or 

planning to construct/install one or more FGD systems by December 31, 2020. 

Please provide all free response answers in the highlighted yellow areas. Throughout 

Part B, you may need to make copies of certain sections/questions for multiple FGD 

systems. Instructions are provided throughout Part B regarding making copies. Note 

that system ID fields must be populated on the copied tab or section, located in the 

upper right corner under "Plant ID" and "Plant Name", in order to correlate the requested 

information with the correct system. 

Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID:

Plant Name:

Part: B

Section Title: 1. General FGD System Information

 Instructions:

CBI? B1-1.

(Continue)

(Skip to next Questionnaire Part)

CBI? B1-2.

Part B requests information about flue gas desulfurization (FGD) systems that are located at the plant or are planned to be located at the plant that are used to service fossil-fueled electric 

generating units. See Part A Section 8 for unit classifications. Complete Part B if you operate one or more FGD systems , or if you are currently constructing/installing or planning to 

construct/install one or more FGD systems by December 31, 2020, to service fossil-fueled electric generating units.

Figure B-1. Example Recirculation Wet FGD Scrubber System Diagram

Insert Plant ID

Insert Plant Name

Does the plant operate one or more flue gas desulfurization (FGD) systems that service fossil-fueled steam electric generating units, or is the plant currently constructing/installing or planning 

to construct/install one or more FGD systems to service fossil-fueled steam electric generating units by December 31, 2020? 

Complete Table B-1 for each FGD system that the plant operates that services fossil-fueled electric generating units, or is currently constructing/installing or planning to construct/install to 

service fossil-fueled electric generating units by December 31, 2020. Assign an FGD system ID to each FGD system using the drop down menu provided. Assign the FGD systems 

sequentially using the numbered IDs (e.g., FGD-1, FGD-2) for the systems currently operating. Assign the FGD systems sequentially using the lettered IDs (e.g., FGD-A, FGD-B) for the 

systems that are planned to operate. Enter the date the system initially began operation or is planned to begin operation. Identify each steam electric unit (currently operating or planned 

units) that is serviced by each FGD system using the codes EPA assigned to steam electric units in Table A-8 and/or Table A-9. Identify the type of oxidation performed in the FGD system 

for all wet FGD systems (Note: mark "Not Applicable" for dry FGD systems). Also provide the design or actual sulfur dioxide removal efficiency for each FGD system. 

Wet FGD systems capture sulfur dioxide from the flue gas using a wet slurry that generates a process wastewater that exits the scrubber absorber, shown as FGD slurry blowdown in Figure 

B-1 for recirculation scrubbers, or as FGD slurry discharge in Figure B-2 for single pass scrubbers. Indicate for each FGD system if FGD slurry blowdown (or FGD slurry discharge) is 

generated. 

Use the drop down boxes to identify the type of FGD system and to specify the type(s) of sorbents used in the system. If a sorbent used is not provided in the drop down, identify "other" and 

provide the type(s) of sorbent in the yellow highlighted box to the right.

Yes

Yes

No

Yes

B-1 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Figure B-2. Example Single Pass Wet FGD Scrubber System Diagram

B-2 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Date System 

Initially Brought 

On Line, or 

Planned to be 

Brought On Line

(month/year)

Steam Electric Units from Table A8 and/or A-9 Serviced by This FGD 

System 

[check all boxes that apply]

Does (or Will) the 

System Generate a 

FGD Slurry 

Blowdown (or Slurry 

Discharge) Stream 

(i.e., is it a wet 

system)?

Type of 

Oxidation 

(Forced, 

Natural, or 

Inhibited)

Type of FGD 

System

Sulfur 

Dioxide 

Removal 

Efficiency

(%)

Primary:

01/1995 Secondary: 97.5

Tertiary:

Quaternary:

Primary:

Secondary:

Tertiary:

Quaternary:

Primary:

Secondary:

Tertiary:

Quaternary:

Primary:

Secondary:

Tertiary:

Quaternary:

Primary:

Secondary:

Tertiary:

Quaternary:

Primary:

Secondary:

Tertiary:

Quaternary:

Primary:

Secondary:

Tertiary:

Quaternary:

Primary:

Secondary:

Tertiary:

Quaternary:

Primary:

Secondary:

Tertiary:

Quaternary:

Example:

Table B-1. FGD Systems in Operation or Planning to be Operated by December 31, 2020

Type of Sorbent

FGD System 

ID

Forced

Inhibited

Natural

Not Applicable

Yes

No

SE Unit 1

SE Unit 2

SE Unit 3

SE Unit 4

SE Unit 5

SE Unit 8

SE Unit 9

SE Unit 7

SE Unit 6 SE Unit A

SE Unit B

SE Unit C

SE Unit D

Forced

Inhibited

Natural

Not Applicable

Yes

No

Forced

Inhibited

Natural

Not Applicable

Yes

No

Forced

Inhibited

Natural

Not Applicable

Yes

No

Forced

Inhibited

Natural

Not Applicable

Yes

No

Forced

Inhibited

Natural

Not Applicable

Yes

No

Forced

Inhibited

Natural

Not Applicable

Yes

No

Forced

Inhibited

Natural

Not Applicable

Yes

No

Forced

Inhibited

Natural

Not Applicable

Yes

No

SE Unit 10

SE Unit 1

SE Unit 2

SE Unit 3

SE Unit 4

SE Unit 5

SE Unit 8

SE Unit 9

SE Unit 7

SE Unit 6 SE Unit A

SE Unit B

SE Unit C

SE Unit 10 SE Unit D

SE Unit 1

SE Unit 2

SE Unit 3

SE Unit 4

SE Unit 5

SE Unit 8

SE Unit 9

SE Unit 7

SE Unit 6 SE Unit A

SE Unit B

SE Unit C

SE Unit 10 SE Unit D

SE Unit 1

SE Unit 2

SE Unit 3

SE Unit 4

SE Unit 5

SE Unit 8

SE Unit 9

SE Unit 7

SE Unit 6 SE Unit A

SE Unit B

SE Unit C

SE Unit D SE Unit 10

SE Unit 1

SE Unit 2

SE Unit 3

SE Unit 4

SE Unit 5

SE Unit 8

SE Unit 9

SE Unit 7

SE Unit 6 SE Unit A

SE Unit B

SE Unit C

SE Unit D SE Unit 10

SE Unit 1

SE Unit 2

SE Unit 3

SE Unit 4

SE Unit 5

SE Unit 8

SE Unit 9

SE Unit 7

SE Unit 6 SE Unit A

SE Unit B

SE Unit C

SE Unit D SE Unit 10

SE Unit 1

SE Unit 2

SE Unit 3

SE Unit 4

SE Unit 5

SE Unit 8

SE Unit 9

SE Unit 7

SE Unit 6 SE Unit A

SE Unit B

SE Unit C

SE Unit D SE Unit 10

SE Unit 1

SE Unit 2

SE Unit 3

SE Unit 4

SE Unit 5

SE Unit 8

SE Unit 9

SE Unit 7

SE Unit 6 SE Unit A

SE Unit B

SE Unit C

SE Unit 10 SE Unit D

SE Unit 1

SE Unit 2

SE Unit 3

SE Unit 4

SE Unit 5

SE Unit 8

SE Unit 9

SE Unit 7

SE Unit 6 SE Unit A

SE Unit B

SE Unit C

SE Unit 10 SE Unit D

B-3 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID: Insert Plant ID

Plant Name: Insert Plant Name

Part: B

Section Title:

 Instructions:

CBI? B2-1.

Maximum 

(gpm)

24-Hour 

Daily 

Average 

(gpm)

Example HYC-1, VFB-1 EQ-P, CP-1-1, CL-P-1, PH1, FLT-S-11,200 1,000 06/2012

a – This question refers to the blowdown solids handling, not the treatment system solids handling.

Complete Table B-2 for each FGD system under construction/installation or planned to be constructed/installed by December 31, 2020 that is reported in Table B-1 and is 

expected to generate FGD slurry blowdown. Enter the planned method for handling solids generated, whether FGD scrubber purge (or slurry discharge ) will be generated, 

the type of wastewater treatment system, the design maximum and 24-hour daily average flow rate for the treatment system, and the date the treatment system will be 

brought on line. Use codes from the Code Tables tab, as appropriate, and separate multiple entries with commas. If you do not know the type of wastewater treatment 

system that will be installed or the flow rate of the treatment system, enter "Unknown" into the appropriate columns in the table.

Throughout this section, provide information for all FGD systems under construction/installation or planned to be constructed/installed by December 31, 2020 that are 

reported in Table B-1 and are expected to generate FGD slurry blowdown . Please provide all free response answers in the highlighted yellow areas. 

2. Planned FGD System Information

Table B-2. FGD Systems Planned or Under Construction/Installation

Type of Wastewater 

Treatment System 

Planned to Treat FGD 

Scrubber Purge (or Slurry 

Discharge) (See 

Wastewater Treatment 

Units Table in Code 

Tables Tab)

Design Flow Rate for 

FGD Treatment System

Estimated Date the New 

FGD Treatment System 

Will be Brought On Line (or 

Date FGD Scrubber Purge 

(or Slurry Discharge) Will 

be Transferred to Existing 

System)

FGD System ID (month/year)

Planned Solids Handling 

for the FGD Slurry 

Blowdown (See Solids 

Handling Table in Code 

Tables Tab) a

Will System 

Generate 

FGD 

Scrubber 

Purge (or 

Slurry 

Discharge)?

Will FGD 

Scrubber Purge 

(or Slurry 

Discharge) be 

Treated by New 

or Existing 

Treatment 

System

Yes

B-4 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID: Insert Plant ID

Plant Name: Insert Plant Name

Part: B

Section Title: 3. FGD Additive Information

 Instructions:

CBI? B3-1.

Additive

FGD System(s) in which Additive is Used or 

is Planned to be Used

Throughout this section, provide information for all FGD Systems listed in Table B-1. Please provide all free response answers in the highlighted 

yellow areas. 

In Table B-3, indicate the additive(s) used or planned to be used in each FGD system listed in Table B-1, and provide a description of its purpose. 

[Check all boxes that apply.] 

Table B-3. FGD Additive Information

Purpose of Additive

Sodium thiosulfate

Adipic acid

Elemental sulfur

Dibasic acid (DBA)

Formic acid

Organosulfide

Yes

FGD 1

FGD 2

FGD 3

FGD 4

FGD 5

FGD 6

FGD A

FGD B

FGD C

Increase sulfur dioxide removal Increase mercury removal

Inhibit oxidation of FGD solids Scale inhibitor

Defoaming agent

Other (specify below): 

FGD 1

FGD 2

FGD 3

FGD 4

FGD 5

FGD 6

FGD A

FGD B

FGD C

FGD 1

FGD 2

FGD 3

FGD 4

FGD 5

FGD 6

FGD A

FGD B

FGD C

FGD 1

FGD 2

FGD 3

FGD 4

FGD 5

FGD 6

FGD A

FGD B

FGD C

FGD 1

FGD 2

FGD 3

FGD 4

FGD 5

FGD 6

FGD A

FGD B

FGD C

Increase sulfur dioxide removal Increase mercury removal

Inhibit oxidation of FGD solids Scale inhibitor

Defoaming agent

Other (specify below): 

Increase sulfur dioxide removal Increase mercury removal

Inhibit oxidation of FGD solids Scale inhibitor

Defoaming agent

Other (specify below): 

Increase sulfur dioxide removal Increase mercury removal

Inhibit oxidation of FGD solids Scale inhibitor

Defoaming agent

Other (specify below): 

Increase sulfur dioxide removal Increase mercury removal

Inhibit oxidation of FGD solids Scale inhibitor

Defoaming agent

Other (specify below): 

FGD 1

FGD 2

FGD 3

FGD 4

FGD 5

FGD 6

FGD A

FGD B

FGD C

Increase sulfur dioxide removal Increase mercury removal

Inhibit oxidation of FGD solids Scale inhibitor

Defoaming agent

Other (specify below): 

B-5 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Other (specify below):

Other (specify below):

None

FGD 1

FGD 2

FGD 3

FGD 4

FGD 5

FGD 6

FGD A

FGD B

FGD C

FGD 1

FGD 2

FGD 3

FGD 4

FGD 5

FGD 6

FGD A

FGD B

FGD C

FGD 1

FGD 2

FGD 3

FGD 4

FGD 5

FGD 6

FGD A

FGD B

FGD C

Increase sulfur dioxide removal Increase mercury removal

Inhibit oxidation of FGD solids Scale inhibitor

Defoaming agent

Other (specify below): 

Increase sulfur dioxide removal Increase mercury removal

Inhibit oxidation of FGD solids Scale inhibitor

Defoaming agent

Other (specify below): 

B-6 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID: Insert Plant ID

Plant Name: Insert Plant Name

FGD System ID: Insert System ID

Part: B

Section Title: 4. Wet FGD System Information

 Instructions:

CBI? B4-1.

(Continue)

(Skip to Section 8)

CBI? B4-2.

Minimum operating concentration: ppm

Maximum operating concentration: ppm

Throughout this section, you will be required to provide information for each wet FGD system that the plant operates, reported in Table B-1. This 

section does not need to be completed for planned systems. Please provide all free response answers in the highlighted yellow areas. 

Make copies of Section 4 and the Section 4 tables for each wet FGD system previously defined in Table B-1 using the "Copy Section 4 

and Section 4 Tables" button below. Please note that you will create two new tabs for these sections. You may delete unneeded tabs, 

if accidently created. Enter the FGD system ID in the space provided above (use FGD system IDs assigned in Table B-1).

Did you report use of a FGD system that generates FGD slurry blowdown (i.e., wet system) in Table B-1?

Provide the operating concentration range of chlorides within the FGD scrubber absorber.

Copy Section 4 and Section 4 Tables

Yes

Yes

Yes

No

B-7 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B4-3.

FGD system maximum design chlorides concentration: ppm

FGD equipment that determines maximum design concentration: 

FGD equipment that determines maximum design concentration: 

FGD equipment that determines maximum design concentration: 

FGD equipment that determines maximum design concentration: 

CBI? B4-4.

ppm

and %

CBI? B4-5.

ppm

%

CBI? B4-6.

gpm

hpd

dpy

Provide the maximum design chlorides concentration for the FGD system and indicate which specific equipment unit(s) of the FGD system 

determine this concentration (e.g., FGD scrubber absorber, piping). Also provide the materials of construction for the specific FGD equipment that 

determine the maximum design chlorides concentration. If multiple materials are used in the construction of the FGD equipment that determines 

the maximum design chlorides concentration, identify the component that is the most vulnerable to corrosion due to chlorides concentrations. If 

the material of construction is not provided in the drop down menu, select "other" and provide the name in the yellow box provided.

Provide the typical flow rate, duration, and frequency of the mist eliminator wash water for the FGD system for calendar year 2009. Provide 2010 

data for systems that were not operating in 2009.

Indicate the FGD system parameter(s) that are used to determine when the FGD slurry is blown down from the FGD system. [Check all boxes 

that apply.] 

For water sources that may be used as a source of FGD reagent preparation water or absorber make-up water (e.g., fresh intake, recycled 

process water), indicate the maximum chlorides concentration and maximum solids percentage that is acceptable for the water to be used for 

those purposes. Identify any other criteria that the source water must meet.

Chlorides concentration, maintained less than

Solids percentage, maintained between 

Other, explain: 

Chlorides concentration:

Solids percentage:

Other, explain: 

Yes

Yes

Yes

Yes

B-8 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B4-7.

gpm

hpd

dpy

CBI? B4-8.

gpm

hpd

dpy

CBI? B4-9.

gpm

hpd

dpy

CBI? B4-10. Provide the source of the mist eliminator wash water used. [Check all boxes that apply.] If the source is a process wastewater not provided in the 

dropdown box, select other and provide in the yellow box the name of the process wastewater and a short description.

Provide the typical flow rate, duration, and frequency of the absorber make-up water for the FGD system for calendar year 2009. Provide 2010 

data for systems that were not operating in 2009.

Provide the typical flow rate, duration, and frequency of the FGD reagent preparation water for the FGD system for calendar year 2009. Provide 

2010 data for systems that were not operating in 2009.

Provide the typical flow rate, duration, and frequency of the FGD reagent slurry for the FGD system for calendar year 2009. Provide 2010 data for 

systems that were not operating in 2009.

Raw intake water

Intake water that has been treated on site prior to use

Process wastewater

Other, explain: 

Yes

Yes

Yes

Yes

B-9 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B4-11.

CBI? B4-12.

CBI? B4-13.

% FGD solids generated 

% FGD solids generated 

% FGD solids generated 

% FGD solids generated 

CBI? B4-14.

(Continue)

(Skip to Question B4-16)

Provide the source of the absorber make-up water used. [Check all boxes that apply.] If the source is a process wastewater not provided in the 

dropdown box, select other and provide in the yellow box the name of the process wastewater and a short description.

Provide the source of the FGD reagent preparation water used. [Check all boxes that apply.] If the source is a process wastewater not provided in 

the dropdown box, select other and provide in the yellow box the name of the process wastewater and a short description.

Indicate the type of solids that are generated within the FGD scrubber system. Also provide the approximate percent of the total FGD solids 

generated within the FGD system for each type (e.g., 85% calcium sulfate, 15% calcium sulfite).

Are the FGD solids combined with fly ash , bottom ash , or other material? 

Raw intake water

Intake water that has been treated on site prior to use

Process wastewater 

Other, explain: 

Calcium sulfate (gypsum)

Calcium sulfite

Other, explain: 

Other, explain: 

Yes

Yes

Yes

Intake water that has been treated on site prior to use

Process wastewater

Other, explain: 

Yes

Raw intake water

Yes

No

B-10 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B4-15.

CBI? B4-16.

CBI? B4-17.

CBI? B4-18.

Typical concentration: ppm

Minimum concentration: ppm

Maximum concentration: ppm

Provide the typical, maximum, and minimum chlorides concentration of the FGD solids produced by the FGD system in calendar year 2009. The 

chlorides concentration should be given on a wet basis (i.e., analysis of the FGD with the moisture content included); however, if the chlorides 

concentration is not known on a wet basis, provide the dry-basis concentration and note that it is a dry-basis concentration in the comments.

Indicate the method of FGD solids dewatering used by the plant for the FGD solids. [Check all boxes that apply.] 

Is a cementitious/pozzolanic material produced with the FGD solids at the plant?

Indicate the methods of FGD solids separation used by the plant for FGD slurry blowdown (or slurry discharge). Refer to Figure B-1 for an 

example of a FGD solids separation system. Note that FGD solids separation and FGD solids dewatering are separate processes. [Check all 

boxes that apply.] 

Hydrocyclones

Centrifuge

Thickener

Other, explain: 

Blowdown sent directly to a pond system reported in Table D-1 (no FGD solids separation process)

Blowdown sent directly to wastewater treatment system reported in Table D-2 (no FGD solids separation process)

Vacuum drum filter

Vacuum belt filter

Gypsum stacking

Other, explain: 

Yes

Yes

Yes

Yes

Yes

No

B-11 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B4-19.

ppm

%

ppm

What parameters affect the ability of the FGD solids to be marketed, sold and/or given away? [Check all boxes that apply.] 

Chlorides content: 

Moisture content: 

Other, specify: 

None – Industry(ies) to which the FGD solids are marketed has not specified standards for the solids. 

N/A – FGD solids are not marketed, sold, or given away. 

Yes

B-12 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID: Insert Plant ID

Plant Name: Insert Plant Name

FGD System ID: Insert System ID

Part: B

Section Title: 4. FGD Solids Disposition and Marketing for Wet FGD Systems

 Instructions:

CBI? B4-20.

Stored permanently

Stored temporarily 

(later hauled offsite/marketed)

Stored permanently

Stored temporarily 

(later hauled offsite/marketed)

Other, explain: 

Other, explain: 

In Table B-4, indicate the ultimate destination of FGD solids from the FGD system and provide the tonnage for each type of storage/handling 

technique for calendar years 2005, 2007, and 2009. If the FGD solids are stored in an on-site landfill or pond/impoundment , including those located 

on non-adjoining property, provide the amount of FGD solids stored permanently and/or temporarily. 

For example, a plant may operate a gypsum stacking operation using a pond/impoundment, and some amount of FGD solids that are transferred to 

the pond/impoundment are dewatered and sold for use in wallboard manufacturing. In this case, the amount of FGD solids sold for wallboard 

manufacturing should be identified in BOTH the "Sent to Pond/Impoundment reported in Table A-4: Stored temporarily" category AND the "Marketed 

and Sold" category. In this same example, all the FGD solids that are transferred to the pond/impoundment and either left settling at the bottom of 

the pond/impoundment or used in increase the banks of the pond/impoundment should be identified as "Sent to Pond/Impoundment reported in 

Table A-4: Stored permanently." 

Ultimate Destination of FGD Solids Amount Disposed in 2009 

(tons)

Throughout this section, you will be required to provide information on FGD solids disposition for each wet FGD system that the plant operates, 

reported in Table B-1. This section does not need to be completed for planned systems. Please provide all free response answers in the highlighted 

yellow areas. 

Table B-4. FGD Solids Disposition for 2005, 2007, and 2009

Amount Disposed in 2005 

(tons)

Amount Disposed in 2007 

(tons)

Sent to Landfills reported in 

Table A-6

Marketed and sold

Given away

Sent to Pond/Impoundment 

reported in Table A-4

Sent to Pond/Impoundment not reported in Table A-4

Sent to Landfills not reported in Table A-6

Yes

B-13 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B4-21.

Tons Gross Revenue 

Generated ($) Tons Gross Revenue Generated ($) Tons Gross Revenue Generated ($)

CBI? B4-22.

$ $ $

Solids dewatering $ $ $

$ $ $

$ $ $

$ $ $

Other: $ $ $

Other: $ $ $

Other: $ $ $

$ $ $

Cost of on site disposal 

Process

Total

Cost of off site disposal 

Complete Table B-5 if the plant markets, sells, and/or gives away the FGD solids from this FGD system. For each destination, provide the tons of 

FGD solids for which the FGD solids are marketed, sold, and/or given away. Also provide the gross revenue generated from marketing/selling the 

FGD solids for each destination.

Table B-5. FGD Solids Marketed/Sold in 2005, 2007, and 2009

Destination

2005

In Table B-6, provide the total cost incurred to remove or dispose of FGD solids from 2005 to 2009 including the cost for labor, materials, 

transportation, and energy. Also provide the cost by component. Include other components not provided in the list of processes in the yellow box 

provided.

Table B-6. Cost Incurred to Remove or Dispose of FGD Solids in 2005, 2007, and 2009

Solids separation 

Hauling FGD solids

Total Costs Incurred

2005 2007 2009

Total Costs Incurred Total Costs Incurred

2007 2009

Yes

Yes

B-14 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID:

Plant Name:

Part: B

Section Title: 5. FGD Wastewater Generation

 Instructions:

CBI? B5-1.

Percent

80%

20%

Other

Other

Other

Other

Other

Other

Other

FGD Reagent Preparation Water, Absorber Make-Up Water, and Mist Eliminator Wash Water

(Sources, Percent Contribution, and Flow Rate)

Source(s)

FGDB

CTB

Example:

FGD System ID

Insert Plant ID

Insert Plant Name

Flow Rate

(gpd)

48,000

12,000

Table B-7. FGD System Water Sources and Flow Rates

In Table B-7, provide information for each wet FGD system that the plant operates reported in Table B-1. For the source of FGD reagent preparation water, absorber make-up 

water, and mist eliminator wash water, you may enter more than one source. Select a source from the dropdown menu. For the percent contribution of the flow rates, provide the 

percentage based on the total flow rate for all these sources entering the FGD system.

Throughout this section, you will be required to provide information for all wet FGD systems that the plant operates, reported in Table B-1. This section does not need to be 

completed for planned systems. Please provide all free response answers in the highlighted yellow areas. 

Yes

B-15 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B5-2.

200 gpm 10 hpd

240,000 12 to 16 120,000 gpd 365 dpy

gpm hpd

to gpd dpy

gpm hpd

to gpd dpy

gpm hpd

to gpd dpy

gpm hpd

to gpd dpy

gpm hpd

to gpd dpy

gpm hpd

to gpd dpy

CBI? B5-3.

ppm

ppm

Typical Range of Percent 

Solids of FGD Slurry 

Blowdown (or Slurry

Discharge) Exiting the 

Absorber

(%)

Typical Duration 

AND Frequency of 

FGD Scrubber 

Purge (or Slurry 

Discharge) 

Generation

(hpd AND dpy) 

Typical Amount of FGD 

Scrubber Purge (or 

Slurry Discharge) Sent 

to Wastewater 

Treatment or Discharge

(gpm AND gpd)

Typical Amount 

of Solids 

Separation 

Recycle 

Returned to 

Absorber

(gpd)

180,000

Typical FGD Slurry 

Blowdown (or Slurry

Discharge) Flow Rate Exiting 

the Absorber

FGD System ID (gpd)

Example:

Absorber Type

In Table B-8, provide information for each wet FGD system that the plant operates reported in Table B-1. 

Table B-8. Water Generated from Wet FGD Systems

Provide the typical chlorides and solids concentrations of the untreated FGD scrubber purge (or slurry discharge ) transferred to the wastewater treatment system (after the FGD 

solids separation process, but prior to commingling with other process wastewater).

Yes

Yes

Chlorides content: 

Total suspended solids (TSS): 

B-16 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID: Insert Plant ID

Plant Name: Insert Plant Name

Part: B

Section Title: 6. FGD Monitoring Data Instructions

 Instructions:

CBI? B6-1.

(Provide the monitoring data as instructed below)

(Skip to Section 7)

Has your plant collected monitoring data (for any reason) for untreated FGD scrubber purge (or slurry discharge ) in the 12 months prior 

to receiving the ICR for any of the following analytes:

Note: The untreated FGD scrubber purge (or slurry discharge) stream is the FGD wastewater stream leaving the solids 

separation process prior to commingling with other water streams (see Figures B-1 and B-2). 

Throughout this section, you will be required to provide monitoring data for all wet FGD systems that the plant operates, reported in 

Table B-1. This section does not need to be completed for planned systems. Please provide all free response answers in the highlighted 

yellow areas. 

 Metals (including monitoring data for total recoverable or dissolved metals analyses, or trace metals analyses);

 Ammonia;

 Nitrate/nitrite;

 Total Kjeldahl nitrogen (TKN); and

 Total cyanide.

Note: You are not required to perform non-routine tests or measurements solely for the purpose of responding to this 

question.

Provide the monitoring data in Table B-9 in the tab labeled "Part B Section 6 Table" for each different FGD scrubber purge stream for 

which the plant collected monitoring data. Report all results. Identify results that are less than the method detection limit (MDL), and 

results that are between the detection and reporting limits. For example, if the MDL is equal to 5 ng/L, the reporting limit is equal to 15 

ng/L, and the value reported by the laboratory is 12 ng/L, report 12 ng/L as the measured value and identify and describe any qualifiers 

on the data in the corresponding column. Copy Table B-9 as many times as needed using the "Copy Table B-9" button below. 

Yes

Yes

No

Copy Table B-9

B-17 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

The following information should be provided for each data point:

 Name of analyte and CAS Number;

 Analytical method used;

 Sample-specific detection limit for the method used;

 Sample-specific nominal quantitation limit stipulated for the method used;

 Date the sample was collected;

 Location where the sample was collected (e.g., purge tank which collects secondary hydroclone overflow);

 Whether the sample was collected as a grab or as a composite (and note the compositing period used);

 Description of any qualifiers for the measurement;

 For metals, whether the sample was analyzed as total recoverable or dissolved;

 Flow rate (only if flow rate data were recorded at the sampling point during the sampling period).

 Identification of FGD system(s) and steam electric generating unit(s) that the sample represents (report FGD 

 System IDs and associated steam electric generating units from Table B-1); and

Note: If you operate multiple FGD solids separation processes (e.g., two sets of hydroclones), only provide monitoring data collected 

after the last solid separation process. If necessary, you may provide additional information regarding the sample collection techniques or 

analytical methods in the Comments section (e.g., sample collection followed EPA Method 1669 protocols, dynamic reaction cell was 

used in conjunction with analytical method).

 Measured value, including those reported below the laboratory reporting limit, including units (if not detected, list 

 the detection limit value and select the less than (<) symbol in the non-detect indicator column);

B-18 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID: Insert Plant ID

Plant Name: Insert Plant Name

Part: B

Section Title: 6. FGD Monitoring Data

 Instructions:

CBI? B6-2.

NonDetect 

Indicator

Value Units Value Units Value Units

Analyzed as 

Total 

Recoverable or 

Dissolved**

Flow Rate of 

FGD Scrubber 

Purge (or Slurry

Discharge) at 

Time of 

Sampling (gpm)

Date 

Sample 

Collected

Location 

Collected

Collected as 

a Grab or 

Composite

Description 

of Qualifiers

Method 

Detection Limit Reporting Limit

Analyte

Complete Table B-9 for all monitoring data for untreated FGD scrubber purge (or slurry discharge) collected by the plant (for any reason) in the 12 months prior to receiving the ICR for any of the following analytes: 

metals (including monitoring data for total recoverable or dissolved metals analyses), ammonia, nitrate/nitrite, total Kjeldahl nitrogen (TKN), and total cyanide. Complete a separate table for each different FGD 

scrubber purge (or slurry discharge) stream for which the plant is providing monitoring data. Report all results. Identify results that are less than the method detection limit (MDL), and results that are between the 

detection and reporting limits. For Question B6-2, identify the FGD systems and steam electric generating units associated with the FGD scrubber purge data provided in the table. Refer to the instructions in Part B 

Section 6 if you need assistance completing Table B-9.

Throughout this section, you will be required to provide information on monitoring data for untreated FGD scrubber purge (or slurry discharge ) for all wet FGD systems that the plant operates, reported in Table B-1. 

This section does not need to be completed for planned systems. Please provide all free response answers in the highlighted yellow areas. 

Table B-9. Monitoring Data for Untreated FGD Scrubber Purge (or Slurry Discharge)

CAS 

Number

Analytical 

method

Measured Value Including 

Units*

Identify the FGD systems and steam electric generating units associated with the FGD scrubber purge (or slurry discharge) monitoring data provided in the table below. Use the FGD system IDs identified in Table B1 and the SE unit IDs identified in Table A-8. [Check all that apply.]

Yes

FGD-1

FGD-2

FGD-3

FGD-4

FGD-5

FGD-6

SE Unit-1

SE Unit-2

SE Unit-3

SE Unit-4

SE Unit-5

SE Unit-6

SE Unit-7

SE Unit-8

SE Unit-9

SE Unit-10

B-19 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

**Only answer for metals

*If not detected, list the detection limit value and select the less than (<) symbol in the non-detect indicator column.

B-20 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID:

Plant Name:

Part: B

Section Title: 7. FGD Wastewater Treatment

 Instructions:

CBI? B7-1.

(Continue)

(Skip to Question B7-4)

CBI? B7-2.

CBI? B7-3.

Insert Plant ID

Insert Plant Name

Does the plant transfer the FGD scrubber purge (or slurry discharge ) to a settling pond ? 

Throughout this section, you will be required to provide information for all wet FGD systems that the plant operates, reported in Table B1. This section does not need to be completed for planned systems. Please provide all free response answers in the highlighted yellow 

areas. 

Indicate which process wastewaters are commingled with the FGD scrubber purge (or slurry discharge) in the settling pond. [Check all 

boxes that apply.]

If the FGD scrubber purge (or slurry discharge) is commingled with bottom ash or fly ash sluice water in the pond(s), select the option 

below that best describes the configuration of the pond(s). If neither option applies, provide an explanation in the space provided:

Yes

Yes

No

Fly ash sluice

Metal cleaning waste

Mill reject sluice 

None

Bottom ash sluice

Boiler blowdown

Other, explain: 

Other, explain: 

“True” commingling: FGD scrubber purge (or slurry discharge) and bottom ash and/or fly ash sluice water are combined in one pond dedicated to the treatment of both waters 

FGD scrubber purge (or slurry discharge) is treated in a FGD pond and subsequently commingled with ash water in a dedicated ash pond

FGD scrubber purge (or slurry discharge) is not commingled with other wastewaters

Other, explain: 

FGD scrubber purge (or slurry discharge) wastewater is treated using a wastewater treatment system other than a settling pond and subsequently commingled with ash water in a dedicated ash pond

Yes

Yes

B-21 Approved: May 20, 2010
n (FGD) Systems

t Plant ID

t Plant Name

ted in Table B

ighted yellow 

nd. [Check all 

ect the option 

rovided:

a dedicated ash pond

B-22 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B7-4.

CBI? B7-5.

CBI? B7-6.

(Continue)

(Skip to Section 8)

gpd dpy

Indicate all intermediate and final destination(s) of the treated FGD scrubber purge (or slurry discharge). If the plant recycles the treated 

FGD scrubber purge (or slurry discharge), indicate the plant process to which this water is recycled. [Check all that apply].

Plants that produce gypsum from wet FGD systems may generate water from the storage and handling of gypsum. Examples of 

gypsum-related waters are gypsum wash water and gypsum pile runoff . Are gypsum-related waters generated at the plant? Note: 

gypsum-related water does not include FGD slurry blowdown or FGD scrubber purge (or slurry discharge).

If yes, provide the typical volume of gypsum-related waters generated per day (gpd) and the frequency of water generation (dpy) for 

calendar year 2009.

Indicate wastewater treatment technologies used to treat the FGD scrubber purge (or slurry discharge). [Check all boxes that apply.]

Settling pond

Biological reactor – aerobic

Mechanical vapor compression (brine concentrator)

Mechanical vapor compression (brine concentrator) with spray dryer

Chemical precipitation

Biological reactor – anoxic/anaerobic

Mechanical vapor compression (brine concentrator) with crystallizer

Other, explain: 

Constructed wetlands

Yes

No

Yes

Yes

Yes

Indirect discharge to a publicly or privately owned treatment works

Other, explain:

Immediately recycled back to plant process. Please describe how the treated FGD scrubber purge (or slurry discharge) is reused:

Discharged to surface water. Provide NPDES permitted outfall number (from Part A Section 2.2):

Deep well injection

B-23 Approved: May 20, 2010
n (FGD) Systems

les the treated 

ples of 

nt? Note: 

n (dpy) for 

that apply.]

B-24 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B7-7. Indicate how the gypsum-related waters are handled. [Check all boxes that apply.]

Reused in FGD process

Reused in other process operations. Please describe how the gypsum-related waters are reused:

Transferred to treatment system reported in Tables D-1 or D-2. Identify the type of treatment system below. [Check all that apply.]

Discharged to surface water. Provide NPDES permitted outfall number (from Part A Section 2.2):

Indirect discharge to a publicly or privately owned treatment works

Other, explain: 

Yes

Settling pond

Biological reactor – aerobic

Mechanical vapor compression (brine concentrator)

Mechanical vapor compression (brine concentrator) with spray dryer

Chemical precipitation

Biological reactor – anoxic/anaerobic

Mechanical vapor compression (brine concentrator) with crystallizer

Other, explain: 

Constructed wetlands

B-25 Approved: May 20, 2010
n (FGD) Systems

B-26 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID: Insert Plant ID

Plant Name: Insert Plant Name

FGD System ID: Insert System ID

Part: B

Section Title: 8. Dry FGD System Information

 Instructions:

CBI? B8-1.

(Continue)

(Skip to next Questionnaire Part)

CBI? B8-2.

Throughout this section, you will be required to provide information for each dry FGD system that the plant operates, reported in 

Table B-1. This section does not need to be completed for planned systems. Please provide all free response answers in the 

highlighted yellow areas. 

Make copies of Section 8 and Section 8 tables for each dry FGD system previously defined in Table B-1 using the Copy 

Section 8 and Section 8 Tables button below. Please note that you will create two new tabs for these sections. You 

may delete unneeded tabs, if accidently created. Enter the FGD system ID in the space provided above (use FGD 

system IDs assigned in Table B-1).

Did you report use of a dry FGD system in Table B-1?

Indicate how the FGD solid is removed from the flue gas. 

Yes

Fabric filter

Other, specify

ESP

Yes

Yes

No

Copy Section 8 and Section 8 Tables

B-24 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B8-3.

CBI? B8-4.

ppm

%

CBI? B8-5.

gpm

hpd

dpy

CBI? B8-6.

CBI? B8-7.

(Continue)

Provide the flow rate, duration, and frequency of the FGD reagent preparation water for the FGD system for calendar year 2009. 

Provide the source of the FGD reagent preparation water used. [Check all boxes that apply.] 

Is any FGD wastewater generated from the operation of the dry FGD scrubber? 

For water sources that may be used as a source of FGD reagent preparation water (e.g., fresh intake, recycled process water), 

indicate the maximum chlorides concentration and maximum solids percentage that is acceptable for the water to be used for 

those purposes. Identify any other criteria that the source water must meet.

Is the FGD system located upstream or downstream of the fly ash collection system?

(Skip to Question B8-9)

Chlorides concentration:

Solids percentage:

Other, explain: 

Raw intake water

Intake water that has been treated on site prior to use

Process wastewater, specify

Other, explain: 

Yes

No

Upstream of fly ash collection

Downstream of fly ash collection

Yes

Yes

Yes

Yes

Yes

B-25 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B8-8.

CBI? B8-9.

(Continue)

Provide the volume and frequency of wastewater generated from the dry FGD scrubber in 2009.

gpd over days

Indicate all intermediate and final destination(s) of the FGD wastewater. If the plant recycles the FGD wastewater, indicate the 

plant process to which this water is recycled. [Check all that apply].

(Skip to Question B8-11)

Is any FGD wastewater generated from cleaning the dry FGD scrubber (e.g., power washing during scheduled generating unit 

outages)?

Yes

No

Yes

Indirect discharge to a publicly or privately owned treatment works

Immediately recycled back to plant process. Please describe how the FGD wastewater is reused:

Discharged to surface water. Provide NPDES permitted outfall number (from Part A Section 2.2):

Deep well injection

Other, explain:

Transferred to treatment system reported in Tables D-1 or D-2. Identify the type of treatment system below. [Check all boxes that apply.]

Settling pond

Biological reactor – aerobic

Mechanical vapor compression (brine concentrator)

Mechanical vapor compression (brine concentrator) with spray dryer

Chemical precipitation

Biological reactor – anoxic/anaerobic

Mechanical vapor compression (brine concentrator) with crystallizer

Other, explain: 

Constructed wetlands

Yes

B-26 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B8-10.

CBI? B8-11.

ppm

ppm

ppm

What parameters affect the ability of the FGD solids to be marketed, sold and/or given away? [Check all boxes that apply.] 

Indicate all intermediate and final destination(s) of the FGD wastewater from cleaning. If the plant recycles the FGD wastewater 

from cleaning, indicate the plant process to which this water is recycled. [Check all that apply].

Yes

Chlorides content: 

Moisture content: 

Other, specify: 

None – Industry(ies) to which the FGD solids are marketed has not specified standards for the solids. 

N/A – FGD solids are not marketed, sold, or given away. 

Indirect discharge to a publicly or privately owned treatment works

Immediately recycled back to plant process. Please describe how the FGD wastewater is reused:

Discharged to surface water. Provide NPDES permitted outfall number (from Part A Section 2.2):

Deep well injection

Other, explain:

Transferred to treatment system reported in Tables D-1 or D-2. Identify the type of treatment system below. [Check all boxes that apply.]

Settling pond

Biological reactor – aerobic

Mechanical vapor compression (brine concentrator)

Mechanical vapor compression (brine concentrator) with spray dryer

Chemical precipitation

Biological reactor – anoxic/anaerobic

Mechanical vapor compression (brine concentrator) with crystallizer

Other, explain: 

Constructed wetlands

Yes

B-27 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant ID: Insert Plant ID

Plant Name: Insert Plant Name

FGD System ID: Insert System ID

Part: B

Section Title: 8. FGD Solids Disposition and Marketing for Dry FGD Systems

 Instructions:

CBI? B8-12.

Stored permanently

Stored temporarily 

(later hauled offsite/marketed)

Stored permanently

Stored temporarily 

(later hauled offsite/marketed)

Other, explain: 

Other, explain: 

Ultimate Destination of FGD Solids

Sent to Landfills reported in 

Table A-6

Amount Disposed in 2009 

(tons)

Marketed and sold

Sent to Pond/Impoundment 

reported in Table A-4

Sent to Pond/Impoundment not reported in Table A-4

Sent to Landfills not reported in Table A-6

Amount Disposed in 2005 

(tons)

Amount Disposed in 2007 

(tons)

In Table B-10, indicate the ultimate destination of FGD solids from the FGD system and provide the tonnage for each type of storage/handling 

technique for calendar years 2005, 2007, and 2009. If the FGD solids are stored in a landfill or pond/impoundment , provide the amount of FGD 

solids stored permanently and/or temporarily. 

For example, a plant may operate a gypsum landfill, and some amount of FGD solids that are transferred to the landfill may later be removed from 

the landfill and sold for use in wallboard manufacturing. In this case, the amount of FGD solids sold for wallboard manufacturing should be 

identified in BOTH the "Landfills reported in Table A-6: Stored temporarily" category AND the "Marketed and Sold" category. In this same example, 

all the FGD solids that are transferred to the landfill and left in the landfill should be identified as "Landfills reported in Table A-6: Stored 

permanently." 

Given away

Throughout this section, you will be required to provide information on FGD solids disposition for all dry FGD systems that the plant operates 

reported in Table B-1. This section does not need to be completed for planned systems. Please provide all free response answers in the 

highlighted yellow areas. 

Table B-10. FGD Solids Disposition for 2005, 2007, and 2009

Yes

B-28 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI? B8-13.

Tons Gross Revenue 

Generated ($) Tons Gross Revenue Generated ($) Tons Gross Revenue Generated ($)

CBI? B8-14.

$ $ $

Solids dewatering $ $ $

$ $ $

$ $ $

$ $ $

Other: $ $ $

Other: $ $ $

Other: $ $ $

$ $ $

Complete Table B-11 if the plant markets, sells, and/or gives away the FGD solids from this FGD system. For each destination, provide the tons of 

FGD solids for which the FGD solids are marketed, sold, and/or given away. Also provide the gross revenue generated from marketing/selling the 

FGD solids for each destination.

Table B-11. FGD Solids Marketed/Sold in 2005, 2007, and 2009

Destination

2005 2007 2009

2007 2009

Total Costs Incurred Total Costs Incurred Total Costs Incurred

In Table B-12, provide the total cost incurred to remove or dispose of FGD solids from 2005 to 2009 including the cost for labor, materials, 

transportation, and energy. Also provide the cost by component. Include other components not provided in the list of processes in the yellow box 

provided.

Table B-12. Cost Incurred to Remove or Dispose of FGD Solids

Total

Solids separation 

Hauling FGD solids

Cost of on site disposal 

Cost of off site disposal 

Process

2005

Yes

Yes

B-29 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Plant Name: Insert Plant ID

Plant ID: Insert Plant Name

Part: B

Section Title: Part B Comments

Instructions:

Question 

Number

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

Cross reference your comments by question number and indicate the confidential status of your comment by checking the box 

next to “Yes” under "CBI?" (Confidential Business Information). 

Comment

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

B-30 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

B-31 Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Air heater cleaning water AHCW

Ash pile runoff APR Effluent - 1 EFF-1

Boiler blowdown BB Effluent - 2 EFF-2

Boiler fireside cleaning water BFCW Effluent - 3 EFF-3

Boiler tube cleaning water BTCW Effluent - 4 EFF-4

Bottom ash sluice BAS Effluent - 5 EFF-5

Carbon capture wastewater CCAPW Effluent - 6 EFF-6

Coal pile runoff CPR Filter backwash FltBW

Combined ash sluice CAS Sludge SLDG

Combustion turbine cleaning (combustion gas portion of 

turbine) water

COMBCW

Combustion turbine cleaning (compressor portion of the 

turbine) water

COMPRCW POND-1 Effluent POND-1-EFF

Combustion turbine evaporative coolers blowdown TECB POND-2 Effluent POND-2-EFF

Cooling tower blowdown CTB POND-3 Effluent POND-3-EFF

FGD scrubber purge SCRBP POND-4 Effluent POND-4-EFF

FGD slurry blowdown FGDB POND-5 Effluent POND-5-EFF

Filter Backwash FLTBW POND-6 Effluent POND-6-EFF

Floor drain wastewater FDW POND-7 Effluent POND-7-EFF

Flue gas mercury control system wastewater FGMCW POND-8 Effluent POND-8-EFF

Fly ash sluice FAS POND-9 Effluent POND-9-EFF

General runoff GR POND-10 Effluent POND-10-EFF

Gypsum pile runoff GPR POND-A Effluent POND-A-EFF

Gypsum wash water GYPWW POND-B Effluent POND-B-EFF

Ion exchange wastewater IXW POND-C Effluent POND-C-EFF

Landfill runoff - capped landfill LRC WWT-1 Effluent WWT-1-EFF

Landfill runoff - uncapped landfill LRUC WWT-2 Effluent WWT-2-EFF

Leachate LEACH WWT-3 Effluent WWT-3-EFF

Limestone pile runoff LPR WWT-4 Effluent WWT-4-EFF

Mill reject sluice MRS WWT-5 Effluent WWT-5-EFF

For Use as Influents to Pond/Impoundment Systems and/or 

Wastewater Treatment Systems in Part D, Table D-3, AND 

Recycled Waters Throughout Questionnaire.

Steam Electric Questionnaire Code Tables

For Use as Effluents from Pond/Impoundment Systems 

and/or Wastewater Treatment Systems in Part D, Table D-4.

Process Wastewaters Treated Wastewaters

For Use in Tables and Questions throughout Parts A, B, C, D, and F.

Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Steam Electric Questionnaire Code Tables

Once -through cooling water CW WWT-6 Effluent WWT-6-EFF

Reverse osmosis reject water RORW WWT-A Effluent WWT-A-EFF

SCR catalyst regeneration wastewater SCRRW WWT-B Effluent WWT-B-EFF

SCR catalyst washing wastewater SCRWW WWT-C Effluent WWT-C-EFF

Soot blowing wash water SOOTW

Steam turbine cleaning water STCW

Yard drain wastewater YARDW

For Use in Tables and Questions throughout Parts A, B, C, D, and F.

For Use as Influents to Pond/Impoundment Systems and/or 

Wastewater Treatment Systems in Part D, Table D-3, AND 

Recycled Waters Throughout Questionnaire.

Process Wastewaters Treated Wastewaters

Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Steam Electric Questionnaire Code Tables

Adsorptive media ADSORB Burned on site BURN

Aerobic Biological Reactor AERBIO Deep-well injection DWELL

Anaerobic Biological Reactor ANBIO Discharge to POTW POTW

Aerobic/Anaerobic Biological Reactor AER/ANBIO Discharge to PrOTW PrOTW

Chemical Precipitation Reaction Tank 1 - 1 CP-1-1 Discharge to surface water SW

Chemical Precipitation Reaction Tank 1 - 2 CP-1-2 Evaporation EVAP

Chemical Precipitation Reaction Tank 2 - 1 CP-2-1 Hauled off site for reuse 

(removal fee)

HAULR - RF

Chemical Precipitation Reaction Tank 2 - 2 CP-2-2 Hauled off site for reuse (given 

away)

HAULR - GA

Chemical Precipitation Reaction Tank 3 - 1 CP-3-1 Hauled off site for reuse 

(marketed and sold)

SOLD

Chemical Precipitation Reaction Tank 3 - 2 CP-3-2 Hauled off site for disposal HAUL

Clarification, Primary - 1 CL-P-1 Mixed with fly ash for disposal MFA

Clarification, Primary - 2 CL-P-2 On-site landfill (as reported in 

Table A-6)

LANDF

Clarification, Secondary - 1 CL-S-1 POND-1 POND-1

Clarification, Secondary - 2 CL-S-2 POND-2 POND-2

Clarification, Tertiary - 1 CL-T-1 POND-3 POND-3

Clarification, Tertiary - 2 CL-T-2 POND-4 POND-4

Constructed wetland - Cell 1 CWL -1 POND-5 POND-5

Constructed wetland - Cell 2 CWL -2 POND-6 POND-6

Constructed wetland - Cell 3 CWL -3 POND-7 POND-7

Constructed wetland - Cell 4 CWL -4 POND-8 POND-8

Constructed wetland - Cell 5 CWL -5 POND-9 POND-9

Constructed wetland - Cell 6 CWL -6 POND-10 POND-10

Constructed wetland system CWTS POND-A POND-A

Equalization, Primary EQ-P POND-B POND-B

Equalization, Secondary EQ-S POND-C POND-C

Filter, Microfiltration - 1 FLT-M-1 WWT-1 WWT-1

Filter, Microfiltration - 2 FLT-M-2 WWT-2 WWT-2

For Use in Tables and Questions Throughout Parts D and F.

Wastewater Treatment Units Destinations

For Use in Tables and Questions Throughout Parts A, C, D, 

and F.

Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Steam Electric Questionnaire Code Tables

Filter, Microfiltration - 3 FLT-M-3 WWT-3 WWT-3

Filter, Microfiltration - 4 FLT-M-4 WWT-4 WWT-4

Filter, Sand/Gravity - 1 FLT-S-1 WWT-5 WWT-5

Filter, Sand/Gravity - 2 FLT-S-2 WWT-6 WWT-6

Filter, Sand/Gravity - 3 FLT-S-3 WWT-A WWT-A

Filter, Sand/Gravity - 4 FLT-S-4 WWT-B WWT-B

Filter, Ultrafiltration - 1 FLT-U-1 WWT-C WWT-C

Filter, Ultrafiltration - 2 FLT-U-2 Reuse as boiler water RECYC - BW

Filter, Ultrafiltration - 3 FLT-U-3 Reuse as bottom ash sluice RECYC - BAS

Filter, Ultrafiltration - 4 FLT-U-4 Reuse as combined ash sluice RECYC - CAS

Filter press - 1 FP-1 Reuse as FGD slurry 

preparation water

RECYC - FGDP

Filter press - 2 FP-2 Reuse as FGD absorber 

makeup

RECYC - FGDAB

Holding tank HT Reuse as fly ash sluice RECYC - FAS

Ion exchange IX Reuse as mill reject sluice RECYC - MRS

Natural wetlands NW Reuse in cooling towers RECYC - CW

pH adjustment - 1 PH-1

pH adjustment - 2 PH-2

pH adjustment - 3 PH-3

Reverse osmosis ROS

Pond Unit - 1 SPD-1

Pond Unit - 2 SPD-2

Pond Unit - 3 SPD-3

Pond Unit - 4 SPD-4

Pond Unit - 5 SPD-5

Pond Unit - 6 SPD-6

Pond Unit - 7 SPD-7

Pond Unit - 8 SPD-8

Pond Unit - 9 SPD-9

For Use in Tables and Questions Throughout Parts D and F. For Use in Tables and Questions Throughout Parts A, C, D, 

and F.

Wastewater Treatment Units Destinations

Approved: May 20, 2010
Steam Electric Questionnaire Part B. Flue Gas Desulfurization (FGD) Systems

Steam Electric Questionnaire Code Tables

Pond Unit - 10 SPD-10

Centrifuge - 1 CENT-1

Pond Unit - 11 SPD-11 Centrifuge - 2 CENT-2

Pond Unit - 12 SPD-12 Centrifuge - 3 CENT-3

Pond Unit - 13 SPD-13 Centrifuge - 4 CENT-4

Pond Unit - 14 SPD-14 Hydrocyclones - 1 HYC-1

Settling tank - 1 ST-1 Hydrocyclones - 2 HYC-2

Settling tank - 2 ST-2 Hydrocyclones - 3 HYC-3

Settling tank - 3 ST-3 Hydrocyclones - 4 HYC-4

Settling tank - 4 ST-4 Filter press - 1 FP-1

Settling tank - 5 ST-5 Filter press - 2 FP-2

Thickener - 1 TH-1 Thickener - 1 TH-1

Thickener - 2 TH-2 Thickener - 2 TH-2

Vacuum drum filter - 1 VF-1 Vacuum drum filter - 1 VF-1

Vacuum drum filter - 2 VF-2 Vacuum drum filter - 2 VF-2

Vacuum filter belt - 1 VFB-1 Vacuum filter belt - 1 VFB-1

Vacuum filter belt - 2 VFB-2 Vacuum filter belt - 2 VFB-2

Wastewater Treatment Units Solids Handling

For Use in Tables and Questions Throughout Parts D and F. For Use as Planned Solids Handling for the FGD Slurry 

Blowdown in Part B Table B-2.

Approved: May 20, 2010