Information Requested from the Miami Fort Station 

Responses to EPA Questions for Miami Fort Generating Station are provided below. All CBI designated data is 

noted within each response and is provided in a separate submittal. 

1. For certain dates between July 1, 2009 and May 24, 2011, UWAG provided, as part of their comments, 

mercury concentration data for the effluent from the Miami Fort Station's chemical precipitation treatment 

system for FGD wastewater. EPA requests that Duke Energy confirm that the data submitted reflect all 

available effluent data for mercury for that time period. EPA also requests that Duke Energy provide all 

arsenic and mercury concentration data for the influent to the plant's chemical precipitation system and all 

arsenic concentration data for the effluent from the plant's chemical precipitation system for this time 

period (i.e., 7/1/2009-5/24/2011). Additionally, for EPA to further evaluate the quality of the data, the 

Agency requires supplemental information to support these submitted data (described in Attachment 1). 

Response: 

a. See USEPA Analytical Data Table MFS 3_26_14 

i. NPDES Sample point 601 is the influent, also called USEPA Sample Point 1 (SP1). 

ii. NPDES Sample point 608 is the effluent, also called USEPA Sample Point 2 (SP2). 

iii. Note flow information (gpd) is based on Midnight to Midnight. These may differ slightly 

from the values provided during the EPA monthly sampling episodes which were based 

on the start and finish of the composite sampler. 

2. EPA requests that Duke Energy provide all available existing data for arsenic and mercury representing the 

influent to and effluent from Miami Fort Station's chemical precipitation system for FGD wastewater, for 

the period May 25, 2011 through December 31, 2013. Please also provide the supplemental information 

for these data as described in Attachment 1. 

Response: 

a. Same Spreadsheets as #1 above 

 

3. Please identify the organosulfide additive (e.g., vendor trade name) used in the FGD wastewater treatment 

system corresponding to the data requested above in #1 and #2. 

Response: 

This is information is confidential business information (CBI) and responses are included in the word 

document “CBI Q A US EPA data request 3_26_14.” 

4. Please provide the specifications that are used to determine appropriate coals for use at the plant (i.e., 

specify the factors that limit the use of specific coals at the plant, such as chlorine content and sulfur 

content). 

Response: 

This is information is CBI and responses are included in the word document “CBI Q A US EPA data 

request 3_26_14.” 

5. Please provide the type and source (i.e., mine name and location) of coal used •at the plant each day from 

January 2012 through December 2013. In addition, please provide the sulfur and chlorine content of the 

coal used at the plant for each day of this period, if available. For days where coal blending occurred, 

please note the percentage of each type of coal used. 

Response: 
This is information is CBI and responses are included in the word document “CBI Q A US EPA data 

request 3_26_14.” 

6. Please provide the following information for each day within the range of sampling results that are being 

provided (including the time period for which UWAG provided sampling results), if available: 

Response: 

See USEPA Analytical Data Table MFS 3_26_14 

a. Chloride concentration, pH, and average daily oxidation-reduction potential (ORP) values within each 

FGD scrubber system; 

 U7 and U8 Absorber daily sample: Chloride, pH, ORP values are shown. Note these are not 

averages. 

b. Chloride concentration, pH, and average daily ORP values for the influent to the FGD wastewater 

treatment system; and 

 FGD Waste Water Treatment System Influent: Chloride, pH, ORP. Note these measures are not 

included in normal daily process sampling. Occasionally during testing they are measured. If 

available, the grab sample values are provided. Note these are not averages. 

c. Electric generation output (MW-hr) for each generating unit serviced by a FGD system. Provide FGD 

operating data for sample dates between 7/1/2009 – 12/31/2013 

This is information is confidential business information (CBI). Refer to SE04643A1_Data 

Request Spreadsheet_Miami Fort 01222014 3_26_14 

 
Answers to EPA Attachment 1 – Guidelines for Submitting analytical Data for the SEEG. Page 6 

Important Considerations 

 Bullet #3. Analytical data is from samples taken at USEPA SP1 (NPDES 601). This is the same measuring 

location used during the USEPA sampling events. The Secondary Hydroclone overflow flows into the WWTS 

Equalization Tank, so this represents the unmixed bleed from U7 FGD or U8 FGD systems. 

Data Submission Format and Criteria 

Analytical Data Table - The “Analytical Data Table MFS” was modified to add two columns. US EPA asked for 

individual test sample values when available. A column was added to show analytical sample values for U7 sample 

point 601 WWTS Influent, and U8 sample point 601 WWTS Influent. The average value is also provided in a third 

column because this was the value reported to OHEPA DMR, and may appear in other data reports. 

Analytical Data Table - Flow Rate (gpd) (Column U) – Flow rate data between Sept 2011 and March 2013 is not 

available due to a computer server backup problem for the PI (process information server). If the flow rates were 

tabulated in another report they are shown, as well as the flow rate data after March 2013. 

Analytical Data Table - Column “X” is used to identify lab information for split samples. Frequently there are 

different results obtained from different labs on the same water sample. This is not an exhaustive study of this issue 

but demonstrates the variability that can exist from lab to lab. 

Dewatering System – Miami Fort uses primary and secondary Hydroclones and vacuum belt filters for gypsum 

dewatering. 

Type of Treatment – Miami Fort uses a “chemical precipitation” treatment system for the Waste Water Treatment 

process. It was identified as WWT-1 in the USEPA ICR submittal. 

Chemicals – Chemicals, dosages, injection points – previously provided in the Engineering Submittal for the 

USEPA monthly sampling events Test #1 9/27-28/2010 thru Test #4 1/13-14/2011. 

Process Flow Diagram – PFD See the following drawing: 

 This information is CBI. Process Flow Diagram Miami Fort FGD Wastewater Treatment System 

46585001 

System Start Date – The WWTS began treating FGD blow-down on 6/11/2007 

Waste Streams Treated – U7 and U8 blow-down from the secondary Hydroclone overflow are the only waste 

streams treated. Approximately 50% U7 and 50% U8 over a year. U7 and U8 can burn the same coal; however, the 

% sulfur and the % Chlorine in the coal will determine the daily blow-down from each unit. 

Laboratory reports – Lab reports have been provided for the sample points on as many days as available.