From:•King.Melanie@epamail.epa.gov

Sent:•Tuesday, August 03, 2010 10:48 AM To:•Higgins, Cortney Cc:•horowitz.michael@epamail.epa.gov; Wayland.Robertj@epamail.epa.gov; Nagelhout.Peter@epamail.epa.gov; Talcott.Fred@epamail.epa.gov; Sorrels.Larry@epamail.epa.gov; Lamson.Amy@epamail.epa.gov Subject:•Re: Interagency Comments on RICE - SI Attachments:•Existing SI RICE NESHAP cost per ton and emission reduction estimates 8-2_- 10.xls; Interagency comments on RICE - EPA responses 8-2-10.doc

Hi Cortney, Attached are EPA's responses to the initial set of interagency comments. We'll be sending responses to the second set of comments separately. As we were working to address the comments, some questions arose regarding the HAP emission factors developed by our contractors. Therefore, we determined that it would be more appropriate to use the HAP emission factors from AP-42, which is the approach that SBA recommended we use. We have revised the emission reduction and cost per ton estimates to use the AP-42 emission factors for HAP. The estimates for VOC also change since the VOC emissions are a function of the HAP emissions. The revised estimates are attached. (See attached file: Existing SI RICE NESHAP cost per ton and emission reduction estimates 8-2-10.xls)(See attached file: Interagency comments on RICE - EPA responses 8-2-10.doc)

Melanie King Energy Strategies Group Sector Policies and Programs Division Office of Air Quality Planning and Standards U.S. Environmental Protection Agency

Mail Code D243-01 RTP, NC 27711

Phone: (919) 541-2469 Fax: (919) 541-5450 king.melanie@epa.gov

|------------> | From: | |------------>

>--------------------------------------------------------------------------- -----------------------------------------------------------------| |"Higgins, Cortney" <Cortney_Higgins@omb.eop.gov> |

>--------------------------------------------------------------------------- -----------------------------------------------------------------| |------------> | To: | |------------>

>--------------------------------------------------------------------------- -----------------------------------------------------------------| |Melanie King/RTP/USEPA/US@EPA |

>--------------------------------------------------------------------------- -----------------------------------------------------------------| |------------> | Date: | |------------>

>--------------------------------------------------------------------------- -----------------------------------------------------------------| |07/29/2010 02:30 PM |

>--------------------------------------------------------------------------- -----------------------------------------------------------------| |------------> | Subject: | |------------>

>--------------------------------------------------------------------------- -----------------------------------------------------------------| |Interagency Comments on RICE - SI |

>--------------------------------------------------------------------------- -----------------------------------------------------------------|Hi Melanie,

Attached are interagency comments received so far on the RICE rule. Please let me know if you have any questions.

Regards, Cortney [attachment "InteragencyWorkingCommentsonEPA_RICE_SI_EO12866Review_07292010.pdf" deleted by Melanie King/RTP/USEPA/US]