SIDELEY

March 21, 2006

By Fax and Post

Bradley Halloran

Hearing Officer

Illinois Pollution Control Board

James R

. Thompson Center, Suite 11-5OO

100 W . Randolph Street

Chicago, IL 60601

Re:

Commonwealth Edison Company v

. IEPA, PCB04-215

Dear Mr. Halloran :

This letter is in response to your request for an update on the status of the United States

EnvinJnnDeDta!PrOteCbnnAoeno/a(^ UBEP&'s^)cOnfidenU8!buaines8infomOaUOn/"CB!"\

proceeding . As Commonwealth Edison Company stated in its Motion to Stay, USEPA is in the

process of making a CBI determination concerning the same information that is at issue in PCB

04-215 .

Recently, we spoke with counsel for USEPA about the status of USEPA's

determination . CurnenUy . USEPA expects that it will issue a determination within two to three

months .

We also note that, in October 2005, USEPA received oGubsequent FOIA request from the

Sierra C!ub, and we understand that USEPAwiU be issuing a determination in that matter as

Very truly yours,

,~-~

BFTTb

cc:

Ann Alexander,

Illinois Attorney General's Office

SWWy Austh vp I a hnnitecllkilflity partnership practicing in affiliation with other Sidley Austin partnerships

CH1 s*r 3r8ol

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