Reid Gardner Generating Station Modeling files for EPA SIP action Naming convention for input and output files The name "rgset2" for "RGGS set #2" is associated with the main CALPUFF simulations. Sensitivity simulations did not follow this convention; see below.

-------------------- CALPUFF and POSTUTIL •CC_cNN_YYYY.EXT •CC = cf for CALPUFF, and pu for POSTUTIL •cNN = control scenario, per table below •YYYY = meteorology year 2001, 2002, or 2003 •.EXT = .inp for control file input, ••.lst for list file output, ••.con for concentration file output Example: pu_c15_2001.inp Since there are 8 controls scenarios (omitting c14) and 3 years, there are 8*4 = 24 CALPUFF and POSTUTIL runs and corresponding .inp, .lst, and .con files.

-------------------- CALPOST •ct_cNN_vmNX_AREA_YYYY.EXT

•ct for "CALPOST" •vmNX = visibility method (MVISBK) and background, see table •AREA = Class I area abbreviation, see table •.EXT = .inp or .lst only Example: ct_c15_vm8b_grca_2001.inp Since there are 4 visibility methods and 5 areas, there are 4*5 = 20 CALPOST runs for each of the 24 scenario/year combinations, or a total of 480 CALPOST .inp and .lst files.

-------------------- Extracted visibility impacts Visibility impacts were extracted from the CASPOST.LST files, and combined into comma-separated value files. The "p98" and "table" files were imported into Excel to create some of the impact tables in the TSD and the accompanying spreadsheet "RGGS_TSD_CALPUFF_tables.xls" •METRIC_SUBSET_rgset2_ct6.221.csv •METRIC = bext for extinction, or ddv for delta deciviews •subset = empty for all daily values, ••p98 for 98th percentile for all years together, ••p98yrs for 98th percentile for individual years, ••table for 98th percentile and/or exceedances •••of 5% and 10% bext or 0.5 and 1.0 dv thresholds •rgset2 = RGGS set #2, the full set of CALPUFF runs •ct6.221 = CALPOST version 6.221 •.csv = extension indicating comma-separated values

File names: •bext_rgset2_ct6.221.csv •bext_p98_rgset2_ct6.221.csv •bext_p98yrs_rgset2_ct6.221.csv •bext_table_rgset2_ct6.221.csv •ddv_rgset2_ct6.221.csv•ddv_p98_rgset2_ct6.221.csv •ddv_p98yrs_rgset2_ct6.221.csv •ddv_table_rgset2_ct6.221.csv (.CSV files without the "_ct6.221" used a different version of CALPOST. CALPOST 5.6394 gave identical results to CALPOST 6.221 for visibility methods vm6a and vm6b.)

------------------------------------------------------- Control scenarios cNN•scenario name•Corresponding NDEP NOx case c00•WRAP •WRAP baseline c02•WRAP NOx •NA c04•Baseline NOx•"Baseline" c11•Enh. LNB+OFA•1 or "LNB+OFA" c12•SNCR •2 c13•ROFA+Rotamix•3 c14•SCR+ROFA •4 c15•SCR •5 c16•SCR 0.06 lb/MMBtu•NA All scenarios except "WRAP baseline" use NDEP BART determination emission rate for SO2 and PM emissions. SCR scenario c14 was not modeled since it has the same emissions as c15.

------------------------------------------------------- Visibility Methods Used vmNX•MVISBK•natural background concentrations vm6a•6•annual average vm6b•6•best 20% of days vm8a•8•annual average vm8b•8•best 20% of days

------------------------------------------------------- Class I Areas within 300 km of Reid Gardner Generating Station AREA•Name •dist•nr •ST•Agency brca•Bryce Canyon • 226•213•UT•NPS grca•Grand Canyon • 85•791•AZ•NPS jotr•Joshua Tree • 292•815•CA•NPS syca•Sycamore Canyon• 288•316•AZ•USFS zion•Zion • 148•224•UT•NPS

======================================================= Sensitivity simulations There were three sets of sensitivity simulations: Multiple units, WRAP comparison, and Gridded WRAP comparison

-------------------- Multiple units These simulations were to assess the affect of modeling the three RGGS stacks separately as opposed to together. The naming convention was the same as for the main simulations above, except that "_u1", "_u2", or "_u3", was inserted after the control scenario abbreviation. Only control scenario c00, visibility method 6a and year 2001, was run, so there are 1*1*3 = 3 CALPUFF and POSUTIL runs for the three units, and for each of these 1*5 CALPOST runs for a total of 45. Examples: cf_c00_u2_2001.inp, ct_c00_u2_vm6a_jotr_2001.inp Only a single extraction file was created: ddv_p98_c00_units.csvThe results from this are in a table in the TSD.

-------------------- WRAP comparison These simulations are a spectrum between the rgset2 main simulations above, and the WRAP's, a sequence to check the effect of gradual changes to the inputs. Only control scenario c00, visibility method 6a, and year 2001 was run. Only the 98th percentile delta deciviews was used in comparing results. The naming convention is similar to the main one, but the initial "CC" indicator was usually changed to indicate the version of the executable, and subdirectory names were used to remove ambiguity and ensure that various outputs remained separate (e.g. CALPOST TUNAM outputs, which have limited scope for variation, like rank(8)_no3_24hr_conc_XXXXXXXX.grd). "EPA input" means the file was edited from the rgset2 main simulation input files above. "WRAP input" means the file was edited from the WRAP's own input files, downloaded the WRAP Regional Modeling Center web site at http://pah.cert.ucr.edu/aqm/308/bart.shtml File names (only .inp and only Grand Canyon shown) EPA input, but with WRAP emissions and PM speciation •rgset2_wrapem\cf_cwe_2001.inp •rgset2_wrapem\ct_cwe_brca_2001.inp •rgset2_wrapem\pu_cwe_2001.inp •rgset2_wrapem\ ddv_p98_wrap0_cwe.csv WRAP input, but CALPUFF 5.8 and CALPOST 5.6394 •WRAP0_cf5.8_ct5.6\cf58_WRAP0_2001.inp •WRAP0_cf5.8_ct5.6\pu15_cf58_WRAP00_2001.inp •WRAP0_cf5.8_ct5.6\ct56_cf58_wrap000_grca_2001.inp •WRAP0_cf5.8_ct5.6\ddv_p98_wrap000_cf58_ct56.csv WRAP input, but CALPUFF 5.8 and CALPOST 6.131 •WRAP0_cf5.8_ct6.1\cf58_WRAP0_2001.inp •WRAP0_cf5.8_ct6.1\pu15_cf58_WRAP00_2001.inp •WRAP0_cf5.8_ct6.1\ct61_cf58_WRAP000_grca_2001.inp •WRAP0_cf5.8_ct6.1\ddv_p98_wrap000_cf58_ct61.csv WRAP input, but CALPUFF 6.112 and CALPOST 6.131 •WRAP0_cf6.1_ct6.1\cf61_WRAP0_2001.inp •WRAP0_cf6.1_ct6.1\pu15_WRAP00_2001.inp •WRAP0_cf6.1_ct6.1\ct61_WRAP000_grca_2001.inp •WRAP0_cf6.1_ct6.1\ddv_p98_wrap000_cf61_cf61.csv (The "WRAP0", "WRAP00" and "WRAP000" names reflect the original idea, which was to integers incremented for each change in CALPUFF, POSTUTIL, and CALPOST, respectively. This did not work in practice because of the initial "cf", "pu", or "ct" assumed in certain scripts used to call the model executables.)

-------------------- Gridded WRAP comparison These simulations were the same as for the WRAP comparison, except they considered gridded receptors over the whole computational domain instead of just discrete receptors at Class I areas. The naming convention is also similar, except that "g" is inserted after the first zero, or at the end, e.g. "wrap0g00" or "cweg", and in place of visibilitymethod and area, gridXXX was used, where XXX = "NO3", "SO4", or "visib: for visibility (extinction). Example for EPA input, but with WRAP emissions and PM speciation (CAPUFF, POSUTIL, .lst and .con not shown) •rgset2_wrapem\ct_cweg_gridNO3_2001.inp •rgset2_wrapem\ct_cweg_gridSO4_2001.inp •rgset2_wrapem\ct_cweg_gridvis_2001.inp Examples for corresponding TUNAM and VUNAM ranked output (These were used in creating isopleth plots) •rank(0)_no3_8760hr_conc_w000gd01.grd •rank(0)_so4_8760hr_conc_w000gd01.grd •rank(0)_visib_8760hr_conc_w000gd01.grd