Need to return call by / at/between and . Signature: ___________________________ Project No.: 0172.07.029.041 DISTRIBUTION

Page _1_ of _2_

Project Name: Steam Electric Rulemaking

TELEPHONE CALL RECORD

Outgoing Call Date: 04/13/2010 Time: 2:15 pm EST

Company Name: Ameren Energy

Coffeen Power Station

Duck Creek Contact Name: Mike Smallwood

Phone No.: Offi ce: (314) 554-4581 Cell: (314) 435-3211

Name: Elizabeth Sabol Eastern Research Group

GENERAL SUBJECT : Plant FGD and Ash Handling Operations

TOPICS DISCUSSED AND ACTION TAKEN

On Wednesday, April 7, at 1:00 pm, I called Ameren En ergy to speak with Jennifer Spalding regarding the

Coffeen and Duck Creek Power Stations in Illinois. I left a message for Ms. Spalding asking her to return my call, or forward my information on to the correct facil ity contact. Ms. Spalding dire cted me to Mike Smallwood. I left a message with Mr. Smallwood asking him to re turn my call to discuss the FGD and ash handling operations at the facilities. I also ex plained that EPA was looking to conduct a site visit at one or both of the facilities, the last week in April.

On Tuesday, April 8, at 2:00 pm, Mr. Smallwood returned my call to discuss the potential date(s) of the EPA site visit(s) and the FGD and ash ha ndling operations at the facilities . The following is a summary of our discussion for each plant.

Coffeen Power Station :

Mr. Smallwood stated that Coffeen opera tes two generating units and each ha s a coal-fired cy clone boiler. He stated that Unit 1 has a gross capacity of 360 MW, and a net capacity of 340 MW. He al so stated that Unit 2 has a gross capacity of 590 MW, and a net capacity of 560 MW. During our conversation, Mr. Smallwood stated that Unit 1 is currently in an outage, but is pr ojected to be operating by the end of April.

Mr. Smallwood stated that both units are equipped w ith an FGD scrubber system, each unit having its own separate absorber. He stated that the FGD scrubber systems on each unit are identical, Hitachi spray tower designs, with forced air oxidation.

I asked Mr. Smallwood the frequency at which the pl ant blows down from the absorbers. Mr. Smallwood explained that both units at the Coffeen plant were desi gned to burn a high sulfur co al (6-6.5 pounds of sulfur per million BTU), but now burn a low sulfur coal ble nd (consisting of Power River Basin (PRB) coal) which requires less frequent blowdown. He st ated that the facility mainly blows down to prev ent lines from plugging and that it is hard to “guess” the frequency of blow down, but that he would follow-up with that information. However, Mr. Smallwood stated that they usually blow down when the solids concentr ation exceeds 20 percent. He also stated that the design ch lorides concentration for the absorb er is 55,000 ppm; however, the current chlorides concentration is only 2,100 ppm.Need to return call by / at/between and . Signature: ___________________________ Mr. Smallwood explained that Coffeen operates the FGD scrubber systems as a closed loop system, meaning there is no discharge from the system. He stated that the scrubber blowdown is transferred to a gypsum stack

that collects the FGD wastewater and recycles it back to the FGD scrubbe r. The gypsum stack is a double-lined pond, where the gypsum is dewatered. Currently, Coffe en bypasses the initial double-lined gypsum stack because it has not been completed. Coffeen expects to complete the double-lined gypsum stack by the end of summer 2010. The scrubber wastewater is currently being tr ansferred directly to the double-lined reclaim basin

until it is sent back to the FGD scrubber. Any stormwater or leachat e collected from the gypsum stack is also sent to the reclaim basin, and ultimate ly sent back to the FGD scrubber.

I asked Mr. Smallwood about the flowrate from the absorb er to the gypsum stack. He stated that Unit 2, the only unit currently in operat ion, recently reported a flow rate of 1,600 gpm from the absorber to the reclaim basin, and 1,800 gpm recycled back into the absorber.

The Coffeen plant has one inactive, cappe d pond. There is also a la ndfill located at the plant for the disposal of fly and bottom ash. Stormwater collected from the landfill is transferred to the reclaim basin and recycled back to the FGD scrubber. Coffeen is working to update thei r NDPES permit to allow stormwater discharge from the

landfill.

Duck Creek :

Mr. Smallwood stated that Duck Creek operates one generating unit with a coal-fired cyclone boiler. He stated that the unit has a gross capacity of 400 MW and a net capacity of 372 MW. Du ring our conversation, Mr.

Smallwood stated that the unit is curren tly in an outage, but is projected to be operating by the end of April.

Mr. Smallwood stated that the generating unit is equippe d with an FGD scrubber syst em. He stated that the FGD scrubber system is a Hitachi spray tower design, with forced air oxidation.

I asked Mr. Smallwood the frequency at which the plant blows down from the absorber. Mr. Smallwood explained that the same situation described for the Coffeen plant, is also occurring at the Duck Creek plant. He again stated that the plant mainly blows down to prevent lines from plugging and that it is hard to “guess” the frequency of blowdown, but that he would follow-up with that informat ion. However, Mr. Smallwood stated that they usually blowdown when the solids concentra tion exceeds 20 percent. He also stated that the design

chlorides concentration for the abso rber is 55,000 ppm; however, the current chlorides concentration is only 1,500 ppm.

Mr. Smallwood explained that Duck Creek operates the F GD scrubber system as a closed loop system, meaning there is no discharge from the system. He stated that the scrubber blowdown is transferred to a gypsum stack

that collects the FGD wastewater and recycles it back to the FGD scrubbe r. The gypsum stack is a double–lined pond, where the gypsum is dewatered. The excess water collec ted in the gypsum stack, is sent to a double-lined

reclaim basin until it is se nt back to the FGD scrubber. Any stormwat er or leachate collect ed from the gypsum

stack is also sent to the r eclaim basin, and ultimately sent back to the FGD scrubber.

The Duck Creek plant has a series of inactive ponds, which the pl ant is currently in th e process of closing. There is also a landfill located at the plant for the disposal of fly and bottom ash. Stormwater collected from the

landfill is sent to the reclaim basin a nd recycled back to the FGD scrubber.