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: 12/10/09 Time: 9:30 am EST

Company Name: Duke Energy’s Miami Fort Generating
Station Contact Name: Jim Steiritz

Phone No .: (513-287-2269)

Name: Kurt Blohm Eastern Research Group

GENERAL SUBJECT : Duke Energy’s Miami Fort Generating Station Flue Gas Desulfurization (FGD) and FGD Wastewater Treatment Systems

TOPICS DISCUSSED AND ACTION TAKEN

On Wednesday, December 9, 2009, I contac ted Jim Steiritz of Duke Energy’s Miami Fo rt Generating Station (Miami Fort). I explained to Mr. Steiritz that I was c ontacting him to collect information regarding the operation of the FGD system and the FGD wastewater treatment syst em at the Miami Fort plant to inform EPA’s decision on which plants to sample as part of the effluent guide lines rulemaking for the steam electric industry. I asked

Mr. Steiritz if he would be able to answer some questions regardin g Miami Fort’s FGD system and FGD wastewater treatment system. Mr. Steiritz stated that he would be available to answer my questions at 9:30 A.M. on Thursday, December 10th.

Mr. Steiritz called me on Thursday, December 10 th at 9:30 AM. Tara Thomas and J.R. Wood from the Miami Fort plant were also on the call with Mr. Steiritz. Th e following is a description of what was discussed during

the call.

Mr. Steiritz explained that the plant has three generating units (Units 6, 7, and 8). He stated that the plant operates wet FGD systems to control sulfur dioxide emissions on Units 7 and 8, and that Unit 6 does not exhaust to a wet FGD system. Mr. Steiritz stated that no additives are used in the FGD systems. Mr. Steiritz

stated that both Units 7 and 8 have associated SCRs wh ich operate on a year-round basis. Mr. Steiritz stated that the plant does not have a ny plans to add a new unit or new FGD systems in 2010.

Mr. Steiritz confirmed the following description of the FGD wastewater trea tment system: Secondary hydroclone overflow from the scrubbe r is sent to an equalization ta nk where lime is added to promote desaturation and the formation of metal hydroxides. Wastewater then flows to the coagulation tank, where organosulfide and ferric chloride are added to promote iron coprecipitation and formation of metal sulfides. The pH of the coagulation tank is maintained between 8.4 and 8.6 S.U. Flow from the coagulation tank splits into two parallel trains consisting of a reaction tank followed by a DensaDeg lamella clarifier. Polymer is added to the reaction tank for coagulation and floccula tion to improve solids removals. The overflow from both

clarifiers is combined in the effluent tank, and then transf erred to the ash pond.

Mr. Steiritz stated that the FGD wastewater treatment system was designed by Infilco Degremont, and that Miami Fort also hired an engineering firm to help install and construct the treatment system. The FGD wastewater treatment system began operating in 2007.Need to return call by / at/between and . Signature: ___________________________ Mr. Steiritz stated that the plant is trying to optimize the wastewater treatment system for the removal of mercury, but the system also achieves some removal of other heavy metals. Ms. Thomas stated that the plant has a limit for mercury in its permit, which basically re quires the plant to optimize the wastewater treatment system for mercury. Ms. Thomas stated that the plan t has no plans of changing the configuration of the wastewater treatment system; however, the plant is experimenting with the use of different polymers in the clarifiers to optimize mercury removal. Mr. Steiritz stat ed that the plant’s permit requires Miami Fort to monitor and report a long list of metals a nd parameters from the wastewater treatment system and the ash pond

effluents. Mr. Steiritz coul d not recall the concentration of mercury in the effluent from the FGD wastewater treatment system, but he stated that the typical mercur y concentration in the effluent from the ash pond is 12

ppt.

Ms. Thomas stated that the FGD scrubber purge from Un its 7 and 8 is sent to the FGD wastewater treatment system equalization tank on an intermittent basis. Fr om the equalization tanks, the FGD purge is pumped through the treatment system at an av erage flow rate of 150-200 gpm.