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Project No.: 0172.07.029.030 DISTRIBUTION 

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Project Name: Steam Electric Detailed Study 

TELEPHONE CALL RECORD 

 Outgoing Call 

Date: 1/7/10 Time: 10:00 am EST 

Company Name: Mirant Corporation 

 Chalk Point Generating Plant 

 Dickerson Generating Plant 

 Morgantown Generating Plant 

Contact Name: Walter Stone 

Phone No.: (202-585-3812)

Name: Kurt Blohm and TJ Finseth Eastern Research Group 

GENERAL SUBJECT : Constellation Flue Gas Desulfurization (FGD) and FGD Wastewater Treatment Systems at Mirant 

Corporation’s Chalk Point, Dickerson, and Morgantown Generating Plants

 

TOPICS DISCUSSED AND ACTION TAKEN 

On Thursday, December 11, 2009, I contacted Walter Stone of Mirant Corporation. I explained to Mr. Stone 

that I was contacting her to collect information regarding the operation of the FGD system and the FGD 

wastewater treatment system at the Chalk Point, Dickerson, and Morgantown Generating Plants to inform 

EPA’s decision on which plants to sample as part of the effluent guidelines rulemaking for the steam electric 

industry. I asked Mr. Stone if he would be able to answer some questions regarding the FGD system and FGD 

wastewater treatment system. Mr. Stone stated that he wanted to verify that ERG is a contractor to EPA. I sent 

Mr. Stone an email with ERG’s contract EPA contract number on December 11, 2009. On December 23, I 

called Mr. Stone to follow up on the email I sent. Mr. Stone stated that he would like me to prepare a list of the 

topics that will be discussed during the call prior to the meeting so that she could gather the appropriate plant 

and corporate personnel to answer the questions. On December 28, 2009, I sent Mr. Stone the list of discussion 

topics. He then informed me that he would be available for a conference on Thursday, January 14th, 2010. 

On Thursday, January 14, 2010 at 1:30 P.M, Kurt Blohm and TJ Finseth of ERG participated in a conference 

call with Walter Stone, Arni Suliman, and Anne Wierman of Mirant Corporation (collectively referred to as 

“Mirant”). The following is a description of what was discussed during the call. 

Mirant stated that the FGD systems operate on Units 1 and 2 at Morgantown, Units 1-3 at Dickerson, and Units 

1 and 2 at Chalk Point. All three FGD systems are limestone forced oxidation systems. [Are any additives used 

in the FGD systems?]. Mirant provided the following details on the operation of nitrogen reduction technologies 

at the three plants: The Morgantown plant operates SCRs year round on Units 1 and 2; the Dickerson plant 

operates SNCRs on Units 1, 2, and 3 primarily during the ozone season; the Chalk Point plant operates an SCR 

year round on Unit 1, and a Selective Auto-Catalytic Reactor (SACR) during the ozone season on Unit 2. 

Mirant stated that SACR is a new technology in which ammonia and a hydrocarbon (Chalk Point uses natural 

gas) are injected into the flue gas. The auto-ignition of the hydrocarbon creates free radicals that catalyze the 

reduction of NOx. 

Mirant confirmed the following details about the FGD wastewater treatment systems at Morgantown, 

Dickerson, and Chalk Point: 
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The FGD purge stream is transferred to an equalization tank where it is combined with filtrate recycle, treated 

wastewater recycle and cooling water. The effluent from the equalization tank flows to Reaction Tank 1 where 

the plant adds lime and organosulfide. From Reaction Tank 1, the wastewater flows to Reaction Tank 2 where 

the plant adds ferric chloride. The effluent from Reaction Tank 2 is tansferred to a clarifier where a flocculating 

polymers are added. The overflow from the clarifier is treated with hydrochloric acid to adjust the pH and 

pumped to two heat exchangers, and transferred to the SBR influent equalization tank. The effluent from the 

SBR influent equalization tank flows into one of the two SBR tanks. The effluent from the SBR tanks is 

pumped to two continuous backwash gravity filters and then to the treated wastewater storage tank. 

The flow rate through the FGD wastewater treatment system at Morgantown is 275 gpm (continuous). The flow 

rate through the FGD wastewater treatment systems at Dickerson and Chalk Point are both 145 gpm 

(continuous). Mirant stated that the FGD wastewater treatment systems were designed to only treat FGD purge 

streams. 

All three wastewater treatment systems were designed by Seimens. The FGD wastewater treatment systems at 

Morgantown and Dickerson began commercial operation in December. The FGD wastewater treatment system 

at Chalk Point began in late November. Mirant stated that they are still in the process of commissioning the 

FGD wastewater treatment plants and that they did not discharge during the first few weeks of operation. 

Mirant stated that the purpose of the wastewater treatment systems is to remove metals and nutrients (nitrogen 

and phosphorus). Mirant stated that preliminary results from sampling indicate that the treatment systems are 

achieving Siemens’ performance guarantees. Mirant stated that they were required to open new permits for 

Morgantown, Dickerson and Chalk Point during the installation of the FGD wastewater treatment systems. 

However, at the end of 6 months of operation, the plants will be required to reopen their permits based on the 

performance data collected during the initial months of operation. 

Brandon Shores stated that they would like to review the notes prepared by ERG for accuracy.