Need to return call by / at/between and . Signature: ___________________________ Project No.: 0172.07.029.030 DISTRIBUTION

Page _1 _ of __2_

Project Name: Steam Electric Detailed Study

TELEPHONE CALL RECORD

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

Company Name: Constellation Energy
Brandon Shores Generating Station Contact Name: Catherine Stewart

Phone No .: (410-787-5782)

Name: Kurt Blohm and TJ Finseth Eastern Research Group

GENERAL SUBJECT : Constellation Energy’s Brandon Shores Generating Station Flue Gas Desulfurization (FGD) and FGD Wastewater Treatment Systems

TOPICS DISCUSSED AND ACTION TAKEN

On Thursday, December 24, 2009, I contacted Catherine St ewart of Constellation Energy (Constellation). I explained to Ms. Stewart that I was contacting her to collect information regarding the operation of the FGD system and the FGD wastewater treatment system at the Brandon Shores Generating Station to inform EPA’s decision on which plants to sample as part of the effluent guidelines rulema king for the steam electric industry.

I asked Ms. Stewart if she would be able to answer some questions regarding Brandon Shores’ FGD system and FGD wastewater treatment system. Ms. St ewart stated that she would like me to prepare a list of the topics that will be discussed during the call prior to the meeting so th at she could gather the appropriate plant and corporate personnel to answer the questions. On December 28, 2009, I se nt Ms. Stewart the list of discussion topics. She then informed me that Constellation Energy would be available for a conferen ce on Thursday, January 7 th

, 2010.

On Thursday, January 7, 2010 at 10:00 A.M, Kurt Blohm a nd TJ Finseth of ERG partic ipated in a conference call with Catherine Stewart, Amy Heatherington, Heathe r Lentz, Bill Kennedy, and Grace ___ of Constellation Energy and Brandon Shores Generating St ation (collectively referred to as “Brandon Shores”). The following is a description of what was discussed during the call.

Brandon Shores stated that the FGD system on Unit 1 began operation in November 2009 and that the FGD system on Unit 2 is planned to be in stalled in February 2010. Brandon Shores confirmed that both FGD systems are limestone forced oxidation systems. Brandon Shores is currently using a chemical defoamant in the Unit 1 FGD system and expects to use the same defoamant in the Unit 2 FGD system when it begins operating. Brandon Shores noted that they had not intended to us e a defoamant based on the design of the FGD system, but after it began operation, th e plant determined that a defoamant was needed.

Brandon Shores stated that Units 1 and 2 both operate SCRs, which were installed sometime in 2000 or 2001. Brandon Shores operated the SCRs onl y during the ozone season until January 2009, at which time; the plant started operating the SCRs year round.

Brandon Shores confirmed the following descripti on of the FGD wastewater treatment system:

The FGD purge stream is transferred to an equalization tank. The effluent from the equalization tank flows to Reaction Tank 1 where the plant adds lime and orga nosulfide (TMT-15). From Reaction Tank 1, theNeed to return call by / at/between and . Signature: ___________________________ wastewater flows to Reaction Tank 2 where the plant adds ferric chloride. The efflue nt from Reaction Tank 2 is

tansferred to a solids contact clarifier where a floccula ting polymer is added. The underf low from the clarifier is pumped back to the first reaction tank or is transferre d to a sludge holding tank. The overflow from the clarifier is treated with hydrochloric acid to adjust the pH to between 6.8 and 7.0. The waste stream is th en diluted with

service water at a ratio of approximately 1:1. The service water is added to lower the TDS concentration and control the temperature of the waste stream before it enters the sequenc ing batch reactor (SBR) portion of the wastewater treatment system. After the waste stream is diluted with service water it is transferred to the SBR influent equalization tank where bisulfite is added to eliminate any free chlori ne. Additionally, a chemical

defoamant and a carbon source are added to feed the biom ass present in the SBRs. The effluent from the SBR influent equalization tank flows into one of the three SBR tanks. Filter feed pumps transfer the effluent from the

SBRs to the sand filters. Brandon Shores has the ability to add ferric chlori de and aluminum chlorohydrate in to

the wastewater after the sand filters. Th e effluent from the sand filters is pumped to two treated storage effluent tanks. From the effluent tanks, the wa stewater is transferred to a diffu sion box where it is commingled with cooling tower blowdown at a ratio of approximately 1000:1. The wastewater then enters th e retention basin, which discharges into a canal th at Brandon Shores shares with He rbert A. Wagner Generating Station (Wagner). The discharge canal flow s into the Chesapeake Bay. Brandon Shores and Wagner have a shared NPDES permit because they ar e located on the same site.

Brandon Shores stated that the FGD wa stewater treatment system is not ye t operating but will begin operating very soon. The plant is still growing biomass for the SBR system. Brandon Shores is currently sending the FGD purge stream generated from the Unit 1 FGD system to a primary flocculating clarifier, which is separate from

the clarifier used in the F GD wastewater treatment system . The overflow from this clarifier is transferred to the FGD absorber return tank and used as make-up to the absorber. The flocculating cl arifier is being used to remove solids and fines while the plant prepares the FGD wastewater treatment sy stem to begin treating the FGD purge stream.

Brandon Shores stated that Siemens designed the FGD wastewater treatment system. The purpose of the FGD wastewater treatment system is to remove the following po llutants from the purge stre am prior to discharge in the retention basin: TSS, pH, As, C d, Cr, Cu, Fe, Pb, Hg, Ni, Ag, Zn, to tal nitrogen, total phosphorus, and BOD.

Brandon Shores stated that the FGD wastewater treatm ent system was designed to treat only the FGD purge stream; Brandon Shores does not plan to use the treatme nt system to treat othe r wastewater streams.

Brandon Shores stated that the design flow rate th rough the FGD wastewater treatment system is 275 gpm.

Brandon Shores noted that the scrubber blowdown from the absorber has an instan taneous flow rate of 910 gpm, but it is generated intermittently on 12 minute cycles . Therefore, the flocculating clarifier is currently treating and recycling the 910 gpm generated intermitten tly by the FGD system since it does not flow through an equalization tank.

Brandon Shores stated that they have a one-week pl anned outage which will be occurring in Spring 2010.

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