"README" for modeling-related files Arizona Regional Haze FIP, November 2012 - Final covering AEPCO Apache, APS Cholla, and SRP Coronado BART EPA Region 9 Note on Zip Archives of Modeling Files The modeling files were first stored with no compression (e.g. wzzip -e0 Cholla_cpf_nocomp.zip); the contents are listed in a corresponding text file. The "nocomp.zip" file was then compressed using LZMA compression (e.g. wzzip -el Cholla_cpf.zipx) to give about 99% compression.

======================================================= APS Cholla Remodeling of all NPR scenarios. Changes from NPR: EPRI method for H2SO4 throughout, merged stacks for units 2 & 3, unit 1 at 2011 CAMD SO2 emission rate to reflect recently upgraded wet FGD and also more recent coal (units 2, 3, and 4 remain at 0.15 lb/MMBtu ADEQ BART emission rates as in NPR); unit 2 PM speciation was revised. Used in NFRM to give updated estimates of visibility benefits. Input and output file-naming convention (different than for NPR): CALPUFF and POSTUTIL file names have the format: •XX_Cholla_SCEN_YYYY.inp or .lst •XX = cf for CALPUFF, pu for POSTUTIL •YYYY = 2001, 2002, or 2003 •SCEN = scenario, one of: ••ebase•Base case, LNB ••ectrl1•SCNR on u2,3,4 ••ectrl2•SCR on u2,3,4 ••ectrl2n•SCR on u2,3,4; no added SCR SO4 CALPOST file names have the format: •ct_cholla_SCEN_VMETH_AREA_YYYY.inp or .lst •VMETH = vm6a, vm6b, vm8a, m8b for MVISBK = 6 or 8, ••and natural background concentrations based on annual average or best 20% of days. •AREA = 4-letter abbreviation for Class I area

Cholla_cpf.zipx•CALPUFF files Cholla_putil.zipx•POSTUTIL files Cholla_cpost.zipx•CALPOST files Cholla_visx.zipx•CSV files extracted from CALPOST output •text listings of *nocomp.zip within the above: •Cholla_remodel_ziplist.txt

Cholla_NFR_remodeling.xls •CALPUFF input calculations, and extracted visibility results 2006FinalDryBottomPC_FGD_FFpmSpeciationProfile_Cholla-Unit2-filtPM.xls •new speciation for unit 2, using FGD+FF consistent with units 3 & 4 •(formerly had used scrubber-only speciation)

------------------------------------------------------- "mrg23" Remodeling of all NPR scenarios to see effect of merged stack.Changes from NPR: merged stacks for units 2 & 3 (did *not* change H2SO4 or unit 1 emissions). Used in NFRM only to state effect of merged stack. Cholla_mrg23_cpf.zipx•CALPUFF files Cholla_mrg23_putil.zipx•POSTUTIL files Cholla_mrg23_cpost.zipx•CALPOST files Cholla_mrg23_visx.zipx•CSV files extracted from CALPOST output •text listings of *nocomp.zip within the above: •Cholla_mrg23_ziplist.txt Cholla_mrg23_visx_table.xls •Excel spreadsheet with tables comparing NPR cases to those with merged stack

======================================================= SRP Coronado "base_p" case: LNB on both units 1 and 2. For unit 1, NOx emission rate is 16.6 TPD from CAMD 2010-11-03 (same as NPR "base_rs" and "base_q"). For unit 2, it's a low-load LNB emission rate, meant to represent Consent Decree's "SCR" not operating at low loads; 6.842 tpd from CAMD 2012-04-01, in a low-load period identified by SRP. Used in NFRM only to compare "base_p" to "base_q" LNB on both units from the FIP Proposal to get benefit of unit 2 Consent Decree SCR. Input and output file-naming convention is same as for NPR. Coronado_NFRph1_cpf.zipx•CALPUFF files Coronado_NFRph1_putil.zipx•POSTUTIL files Coronado_NFRph1_cpost.zipx•CALPOST files Coronado_NFRph1_visx.zipx•CSV files extracted from CALPOST output •text listings of *nocomp.zip within the above: •Coronado_NFRph1_ziplist.txt Coronado_base_p_visx.xls •Excel spreadsheet with tables comparing "base_p" to "base_q"; includes extracted CALPOST output