Need to return call by / at/between and . Signature: ___________________________ 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 Treatmen t Systems at Mirant Corporation’s Chalk Poin t, Dickerson, and Morg antown 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 re garding the operation of the FGD system and the FGD wastewater treatment system at the Chalk Point, Di ckerson, 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 w ould be able to answer some questio ns regarding the FGD system and FGD wastewater treatment system. Mr. Stone st ated that he wanted to verify that ERG is a contractor to EPA. I sent

Mr. Stone an email with ERG’s contract EPA c ontract 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 14 th , 2010.

On Thursday, January 14, 2010 at 1:30 P.M, Kurt Blohm and TJ Finseth of ERG par ticipated in a conference call with Walter Stone, Arni Suliman, and Anne Wierman of Mirant Corporation (co llectively referred to as “Mirant”). The following is a descripti on 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 limest one forced oxidation systems. [Are any additives used in the FGD systems?]. Mirant provided the following details on the operation of ni trogen reduction technologies at the three plants: The Morgantown plant operates S CRs year round on Units 1 and 2; the Dickerson plant operates SNCRs on Units 1, 2, and 3 prim arily during the ozone season; the Chalk Point plant operates an SCR year round on Unit 1, and a Selectiv e Auto-Catalytic Reac tor (SACR) during the ozone season on Unit 2. Mirant stated that SACR is a new technology in whic h ammonia and a hydrocarbon (Chalk Point uses natural gas) are injected into the flue gas. The auto-ignition of the hydrocarbon crea tes free radicals that catalyze the

reduction of NOx.

Mirant confirmed the following details about the F GD wastewater treatment systems at Morgantown, Dickerson, and Chalk Point:Need to return call by / at/between and . Signature: ___________________________ The FGD purge stream is transferred to an equalization tank where it is comb ined with filtrate recycle, treated wastewater recycle and cooling water. The effluent from the equalizatio n tank flows to Reaction Tank 1 where the plant adds lime and organosulfide. From Reactio n Tank 1, the wastewater flow s to Reaction Tank 2 where the plant adds ferric chloride. The effluent from Reacti on Tank 2 is tansferred to a clarifier where a flocculating polymers are added. The overflow from the clarifier is treated with hydroc hloric acid to ad just the pH and pumped to two heat exchangers, and transferred to th e 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 wastewat er 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 an d that they did not discharge duri ng 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 indi cate that the treatment systems are achieving Siemens’ performance guarantees. Mirant stated that they were require d to open new permits for Morgantown, Dickerson and Chalk Poin t 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 re view the notes prepared by ERG for accuracy.