Need to return call by / at/between and

. Signature:

___________________________ Project No.: 0172.0 7 .02 9 .0 30 DISTRIBUTION

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Project Name: Steam Electric Detailed Study

TELEPHONE CALL RECORD

Outgoing Call Date: 12 / 3 /09 Time: 10 : 00 am EST

Company Name: Duke Energy

W. H. Zimmer Power Station Contact Name: Jim Stei ritz

Phone No .: (513

- 287

- 2269)

Name: Kurt Blohm Eastern Research Group

GENERAL SUBJECT : Duke Energy’s W. H. Zimmer Power Station Flue Gas Desulfurization (FGD) and FGD Was tewater Treatment System s

TOPICS DISCUSSED AND ACTION TAKEN

On Wednesday, December 2, 2009, I contacted Jim Steiritz of W.H. Zimmer Power Station (W.H. Zimmer). I
explained to Mr. Steiritz that I was contacting him to collect information regarding th e operation of the FGD
system and the FGD wastewater treatment system at the W.H. Zimmer plant 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.

Steiritz if he wou ld be able to answer some questions regarding W.H. Zimmer’s FGD system and FGD

wastewater treatment system. Mr. Steiritz stated that he would be available to answer my questions at 10:00

A

. M

. on Thursday, December 3 rd

.

Mr. Steiritz called me on Thursday

, December 3rd at 10:00 AM. The following is a description of what was
discussed during the call.

Mr. Steiritz explained that the plant has one generating unit which has a net capacity of 1,300 MW . He stated

that the plant operates a FGD system on the gen erating unit to control sulfur dioxide emissions. Mr. Steiritz
explained that the FGD system was previously operated as an inhibited

- oxidation system ; h owever, in 2001 the
plant converted the system to a t hiosorbi c lime (magnesium

- enhanced lime ) forced

- ox idation system. Mr.

Steiritz stated that the plant does not have any plans to add a new unit or new FGD systems in 2010.

Mr. Steiritz explained that the FGD wastewater treatment system is a chemical precipitation system with lime
softening. The treatment system is operated continuously at a flow rate of approximately 600 gpm and consists

of a mixing tank followed b y a clarifier. Prior to entering the clarifier

, lime and polymers are added to the
mixing tank. Mr. Steiritz stated that the plant may use seve ral different types of polymers and t he use of the

different polymer s depends on several factors (e.g. coal composition and weather conditions )

. The overflow
from the clarifiers is transferred to the plant’s wastewater pond where it is combined with all o ther wastewaters
generated at the plant. These wastewaters include low volume wastewaters (plant sumps), coal

- pile runoff, and

landfill runoff. The effluent from the wastewater pond is transferred to a clearwater pond , which then discharges

into the Ohio R iver via o utfall 005. The underflow solids from the clarifier are rich in magnesium and are sent to the magnesium hydroxide recovery plant. The recovered magnesium hydroxide is injected into the furnace

for SO 3 control

.Need to return call by / at/between and

. Signature:

___________________________ Mr. Steiritz stated that the FGD wastewater treatment system was a joint project designed by plant personnel,
the plant’ s lime supplier ( Carmeuse )

, and Orbital. The FGD wastewater treatment system began operating in

2003 or 2004

.

Mr. Steiritz stated that the FGD wastewater treatment syst em was originally designed to remove dissolved
solids. In 2001 when the plant converted the FGD system from inhibited

- oxidation to forced

- oxidation, the
FGD wastewater stream contained high TDS concentrations. As a result, the plant had troubles meeting it s

whole effluent toxicity limits on o utfall 005. Therefore, the plant installed the treatment system primarily to
address the toxicity issue. Mr. Steiritz stated that the original intent of installing the treatment system was not

to remove metals.

I ask ed Mr. Steritz what pollutant levels the wastewater treatment system is trying to achieve and what levels it
typically achieves . He said that W. H. Zimmer primarily operates the system to meet the effluent toxicity limit,

and that this information is avail able online. He stated that the plant has been successful in meeting the effluent
toxicity limit since installing the wastewater treatment system. Mr. Steiritz stated that he did not know the
typical effluent concentrations from the treatment system but st ated that he could forward this request on to
someone else at the plant.

Mr. Steiritz stated that the plant will have a 10

- day outage in Spring 2010 , but h e did not kno w the exact dates
of the outage

.