From: Palazzolo, Michael A. [mailto:Michael.Palazzolo@alcoa.com] Sent: Wednesday, February 04, 2009 11:27 AM To: Jones.Donnalee@epamail.epa.gov Cc: Branscome, Marvin R.; bstriete@aluminum.org; Coleman, Laura A. Subject: RE: industry review of revised POM data

Hi Donna Lee,

We finally worked our way through the revised POM data and have only a few comments or corrections. We have also identified some additional test data that we recommend EPA use to improve the POM emission factors developed for Anode Bake Furnace Dry Scrubber and Prebake Paste Plant Dry Coke Scrubbers.

Our comments on the data include the following:

1) In the POM Modeling file, there is only one roof monitor vent listed for the Alumax of SC facility (Mt Holly). We had two roof vents listed in the data file provided to EPA in June 2007.

2) Stack parameter values (height, temperature, etc.) listed in the Updated NEI Nov. 3 2008 table for Alcoa Massena East are correct for Roof Vent 1, but incorrect for Roof Vents 2 and 3.

3) We recognized during this review that some Alcoa's smelters listed only one "roof vent" for each potline in the data file provided in June 2007. Each prebake potline actually consists of two potrooms, so there should be two "roof vents" for each potline. Its not clear to us whether making this correction will improve EPA's planned POM modeling as we do not know how EPA intends to configure the potline roof vents in AERMOD/HEM. Facilities listing only one roof vent per potline instead of two include: Rockdale, Alcoa TN, Badin, Eastalco, Massena West and Mt Holly. If EPA wants to include each potroom roof vent separately in the model, each of these facilities will need to provide lat/long coordinates for the separate roof
vents.

Alcoa has speciated POM test reports available for the Anode Bake Furnace Dry Scrubber and Paste Plant Dry Coke Scrubber at the Warrick facility. Data in these reports could be used to improve the POM emission factors for these sources. I do not have the reports electronically, but will mail them to

you.

Thank you for the opportunity to review the data files. Please let me know if you have any additional questions.

Mike

Michael A. Palazzolo Alcoa, Inc 201 Isabella Street at 7th Street Bridge Pittsburgh, PA 15212-5858 Telephone: 412-553-4832 Facsimile: 412-553-4822

### Tennessee

Mt Holly

### Massena West (Prebake)

Eastalco

Baseline Source Data BART Potroom Coordinates (Lambert Conformal) Release Base Beginning X Beginning Y Ending X Ending Y Height Elevatio n Potroom Description

(km) (km) (km) (km) (m) (m) Potline A1 West (wet/SO 2 

### scr.) 1656.836 104.582 1656.995 104.708 16.76 101.5 Potline A1 East (wet scr.) 1656.995 104.708 1657.192 104.860 16.76 101.5 Potline A2 (wet scr.) 1656.786 104.647 1657.141 104.925 16.76 101.5 Potline B1 (wet scr.) 1656.728 104.722 1657.083 105.000 16.76 101.5 Potline B2 (wet scr.) 1656.679 104.785 1657.034 105.062 16.76 101.5

A Lambert Conformal projection is used with an origin of 40.0N, 97.0W and standard parallels at 33N and 45N. The NWS-84 datum is used.

Badin

### Rockdale

Coordinates

Beginning

UTM E/N (km) Ending UTM E/N (km)

EPN LINE ROOM km/km km/km

F10C-1 3 12 685.060, 3382.775 F10C-2 3 12 685.050, 3382.800 F10C-3 3 14 684.960, 3382.720 F10C-4 3 14 684.990, 3382.740 F10D-1 4 16 685.065, 3382.830 F10D-2 4 16 685.025, 3382.870 F10D-3 4 18 684.895, 3382.775 F10D-4 4 18 684.880, 3382.810 F10E-1 5 20 685.000, 3382.875 F10E-2 5 20 684.980, 3382.950 F10E-3 5 22 684.860, 3382.860 F10E-4 5 22 684.850, 3382.890 F10F-1 6 24 684.975, 3382.980 F10F-2 6 24 684.960, 3383.015 F10F-3 6 26 684.860, 3382.925 F10F-4 6 26 684.825, 3382.960 F10G-1 7 28 684.930, 3383.070 F10G-2 7 28 684.915, 3383.125 F10G-3 7 30 684.810, 3383.300 F10G-4 7 30 684.780, 3383.070 F10H-1 8 32 684.910, 3383.170 F10H-2 8 32 684.885, 3383.200 F10H-3 8 34 684.780, 3383.110 F10H-4 8 34 684.760, 3383.150



### Coordinates in UTM Zone 14.