Follow-up items from 12/21 regional haze meeting

Francisco Donez to: mfreeark, jyockey, ebakken, kara.montalvo, 

Charles.Spell, C.Mathai, susan.kidd, ecm

12/29/2011 10:41 AM

Cc: Colleen McKaughan, Thomas Webb, Scott Bohning, Steve Frey

Bcc: Charlotte Withey, Margaret Alkon

Hello everyone:

It was great to meet with you all last Wednesday regarding EPA's actions on Arizona regional haze. My 

apologies for the delay in sending you this message; see below for information on the requested follow-up 

items.

1. Documents from Nevada Regional Haze SIP docket: Here is a link to the docket that includes all 

the materials of record, including public comments, for the proposed approval of the Nevada Regional 

Haze SIP: 

http://www.regulations.gov/#!searchResults;dct=PS;rpp=25;po=0;s=EPA-R09-OAR-2011-0130

See the attachments for comments from a consortium of environmental groups and WildEarth 

Guardians. The two reports that we referenced in our discussions with representatives of the Arizona 

utilities are also copied below, and were attachments to the comments from the environmental 

consortium.

Environmental Consortium:

Enviros Sierra Club et al.pdf EnvirosAtt1GrayReport.pdf EnvirosAtt4PlessReport.pdf

WildEarth Guardians:

WildEarthGuradians.pdf

2. As mentioned during the meeting, we are seeking emissions data for Arizona sources eligible for 

BART (Best Available Retrofit Technology), for use by EPA and its contractor for modeling visibility 

impacts for BART analyses. The data we seek includes the stack parameters listed below. It also 

includes continuous emissions data you may have that is not available on EPA's Emissions Collection 

and Monitoring Plan System (ECMPS); this will help in determining the maximum 24-hour emission 

rate for use in BART modeling. We would also like any stack test data that would help to determine 

PM size fractions and chemical composition. The preferred format is an Excel spreadsheet.

a. Please verify the stack parameters listed in the BART analysis document(s) for your facility on 

ADEQ's Regional Haze and Visibility web site (http://www.azdeq.gov/environ/air/haze/index.html)

, and also provide latitude and longitude coordinates for the various emitting units (stacks), and 

any identifying code numbers such as ORIS codes.

Identifying ID codes (ORIS, and other identifying code numbers)

Stack location

Latitude

Longitude

Stack parameters (preferred units listed, but other units OK):

Stack height (m)

Base elevation (m)
Stack diameter (m)

Exit velocity (m/s)

Exit temperature (K or C)

Stack parameter page numbers in PDF files on ADEQ web site (

http://www.azdeq.gov/environ/air/haze/index.html):

APS Cholla Power Plant (110810d.pdf, 110810e.pdf, 110810f.pdf) stack parameters: 

pdf.16

AEPCO Apache (110810h.pdf) stack parameters: pdf.17

SRP Coronado Generating Station (110810l.pdf) stack parameters: pdf.19 and 33

APS West Phoenix (apswp1.pdf) stack parameters: pdf.8

b. Please provide available emissions data. The preferred units are listed, but other units would 

be OK. We will be modeling maximum 24-hour emission rates; data for 2001-2003 and over the 

past few years is desired. This may be in the form of CEMS data, if that data is not available in 

EPA's Emissions Collection and Monitoring Plan System (ECMPS). You may also wish to provide 

notes on malfunctions and excursions that should not be included in calculating the maximum 

24-hour emission rate.

SO2 emission Rate (g/s)

NOx emission Rate (g/s)

PM2.5 emission Rate (g/s)

PM10 emission Rate (g/s)

c. Please provide any emissions data that may be available from stack tests, for the following 

compounds. This will help in assigning emissions to the appropriate chemical species and size 

fraction in the CALPUFF model input.

SO2

SO4 (sulfate)

NOx and/or NO3 (nitrate)

NH4 (ammonium)

EC (elemental carbon)

OC (organic carbon)

PMF (fine particulate matter)

PMC (coarse particulate matter)

(or values for other sets of PM size ranges)

3. As mentioned during the meeting, EPA will adjust the information submittal deadlines included in 

the letters sent to individual facilities, as appropriate, to allow sufficient time to submit the requested 

information. We will also strive request information immediately as needs arise, to maximize lead time 

for companies to respond. Finally, as requested by meeting attendees, EPA will draft individual letters 

to each utility company indicating that the requested deadlines can shift as appropriate.

Please contact me if you have any questions on the above items or any other regional haze matters. I 

hope you are all enjoying the holidays.

Best,

Francisco

Francisco Dóñez, Ph.D.

US Environmental Protection Agency

On detail to Air Planning Office (AIR-2)

600 Wilshire Blvd., Suite 1460
Los Angeles, CA 90017

Tel. (213) 244-1834

http://www.epa.gov/region9/air/index.html

http://www.epa.gov/region09/fieldoffices/los-angeles.html