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### Icenhour, Melissa K. From: Neuffer.Bill@epamail.epa.gov Sent: Thursday, September 16, 2010 11:16 AM To: Frank.Nathan@epamail.epa.gov; Icenhour, Melissa K. Subject: Fw: NSPS - Nitric Acid - SCR Performance Bill Neuffer Metals and Minerals Group Office of Air Quality Planning and Standards (D 243 - 02) US Environmental Protection Agency Research Triangle Park, NC 27711 Phone - 919 - 541 - 5435 Fax - 919 - 541 - 3 207 E - mail - neuffer.bill@epa.gov Office Location: 109 TW Alexander Drive RTP, NC (D 231C) Overnight mail address: US EPA Mail Code D243 - 02 109 TW Alexander Drive RTP, NC 27709

----- Forwarded by Bill Neuffer/RTP/USEPA/US on 09/16/2010 11:16 AM

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-------------------------------------------- | |Bill Neuffer/RTP/USEPA/US | > ------------------------------------------------------------------------------------------

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-------------------------------------------- | |jeremy.richard@pcsnitrogen.com | > ------------------------------------------------------------------------------------------

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-------------------------------------------- | |09/16/2010 11:15 AM | > ------------------------- -----------------------------------------------------------------

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------- ------------------------------------- | |NSPS - Nitric Acid - SCR Performance | > --------------------------------------------------------------------------- ---------------

-------------------------------------------- | Jeremy, Thanks for talking with me today. We discussed the reasons for the difference in the NOx emissions levels for Units 3 and 5 (1.8 and 0.2 lb/T) - both SCR controlled. Below is a su mmary of the call. Please review. If you can supply additional information; please provide. Unit 3 is a modified plant (increasing HNO3 from 55 to 65% that had extended absorption. SCR was added in 2007. The unit initially began operation in 1978. Th e SCR is low pressure - that is located after the expander. Unit 5 is a new line that began operation in 1999. The plant has a total yearly NOx emission limit so in order to comply, the SCR is run to achieved very low NOx. Also, this SCR is a high press ure unit - that is the SCR is located before the expander. As the unit is high pressure, very good mixing(ammonia andthe flue gas occurs. Thanks Bill Neuffer Metals and Minerals Group Office of Air Quality Planning and Standards (D 243 - 02) US Environmental Protection Agency Research Triangle Park, NC 27711 Phone - 919 - 541 - 5435 Fax - 919 - 541 - 3207 E - mail - neuffer.bill@epa.gov Office Location: 109 TW Alexander Drive RTP, NC (D 231C) Overnight mail address: US EPA Mail Code D243 - 02 109 TW Alexander Drive RTP, NC 27709