1 Site Description Report Iat an Plant 20250 Highway

45 South Weston, MO 64098 March 3 , 2009 1.0 Background and Objectives The Environmental Protection Agency (EPA) is in the process of developing 316(b) cooling water intake structure requirements that refl ect the best technology available (BTA) for minimizing adverse environmental impact for all existing power plants and manufacturing facilities. As part of this process, EPA staff is visiting electric generators and manufacturers to better understand the co oling water intake structure (CWI S) technologies in use at facilities, including the site

specific characteristics of each facility and how these affect the selection and performance of CWI S technologies. EPA is also visiting facilities to better understand cooling water use and specific issues or technologies that can affect 316(b) compliance. As part of its site visit to the Lake Road Plant, EPA also collected information on Kansas City Power and Light Company ’s (KCP&L) Iat an Plant. 2.0 Facility Descriptio n Iat an is located 35 miles up the Missouri River from Kansas City in Weston, M issouri and is owned and operated b y KCP&L. The Iatan plant occupies over 3000 acres and employ s approximately 2 25 peopl e . Cooling and process water withdrawals from and waste water discharges to the Missouri River are regulated under NPDES permit number MO 0082996 which expired on February

5, 2009
. Iatan submitted its NPDES permit application in a timely manner and is awaiting renewal of its permit by the state. 3.0 Electricity Ge neration and Transmission The Iatan plant has a single coal

- fired steam electric generating unit with a total generating capacity

of around 70 6 MW. KCP&Lis currentl y constructing Iatan 2 adjacent to this site ; see Section 8.0 for more information. 4.0 Cool ing Water System and Intake Structure Iat an has one CWI S that provide s once - through cooling water for its existing generating unit . The CWIS is fitted with a trash rack and six standard (i.e., coarse mesh 3/8”) traveling screens. Three circulating water pumps each rated at about 186,000 gallons per minute (gpm) provide a design intake flow 76 ,000 gpm per screen (total 653.8 mgd) of cooling water to the generating unit. Two pumps (four2 screens) are required to run at all times. The through screen velocity is 2. 2 7 feet per second ( fps )
. A smaller fourth (auxiliary) pump only runs while the unit is off
- line to supply

cooling water for the auxiliary sy stem. Iat an inspects its traveling screens annuall y. It also cleans and rebuilds each screen every

two ye ars on a staggered schedule during its routine maintenance outage period. 5.0 Impingement and Entrainment Information KCP&Ldid not provide any information on impingement, entrainment or source water body characterization for this site. 6.0 Cooling Tower Feasibility C ooling water will be supplied to th e new generating unit at Iatan 2 via a mechanical draft cooling tower. No river water will be used for cooling this new unit as make

- up water will be obtained from collector wells located 30 feet under the river. Facility representatives noted that while the Iatan site is large in terms of acreage, much of the land is designated as wetlands or floodplain. 7.0 Debris Handling As with other facilities located on the Missouri River, debris can be significant at Iat an . 8.0 Repowering/Future Uses As discussed above, KCP&Lis in the process of constructing a new 850 MW coal

- fired steam electric generating unit. KCP&L refers to this as Iatan 2, a plant adjacent to the existing Iatan Plant. Iatan 2 will be a high ef ficiency , coal

- fired unit with a generating capacity of 850 MW. KCP&L expects to have Iatan 2 in service in 2010. 9.0 Cooling Ponds Iat an does not have an y cooling ponds. 10.0 Ownership Iat an Unit 1 is majority owned by KCP&L, a subsidiary

of Great Plains Ener gy . KCP&LGreater Missouri Operations Company is also a subsidiary

of Great Plains Energy . Both subsidiaries operate under the KCP&L brand name.3 KCP&Lwill own approximately 620 MW of the Iatan Unit 2 capacity with the remainder jointl y owned by other local electric utilities
. 11.0 316(a) EPA did not collect any information on 316(a) for this site
. 12.0 Ash Handling All bottom ash generated at Iatan is beneficiall y used for use in cement
. Where possible, f

ly ash is beneficially used as a cement substitut e or as a stabilizer. Scrubber wastes associated with the new unit will be placed in an on

- site landfill. KCP&L representatives commented that there was no re

- sale market for these materials. 13.0 Air Emissions Controls KCP&Ldid not provide information on existing air controls at Iatan. However, Iat an 2 will be fitted with a scrubber , SCR and baghouse and Unit 1 will be retrofitted with similar air controls during the expansion.