DOE MONTHLY POTROOMS REPORT

ALCOA WENATCHEE

March 2011

1. Average aluminum production rate ( tons aluminum / day )

Aluminum Aluminum 

 Production Production

lbs / day tons / day

Line 2 140,708 70

2. Particulate emission rate ( lbs / day, Concentration & Airflows) Monitor 

Control Device Roof Monitors 

(Dry Scrubber) Monthly Line

Rolling avg Average Total Particulate

lbs PM /day lbs PM /day lbs PM /day 

Line 2 83.5 646.5 730.1

Line 2 Line 2

Control Device Control Device

(Dry Scrubber) (Dry Scrubber) 

Rolling avg Rolling avg 

mg/dscf dscf/min

1st Quarter 11 0.0650 404930

2nd Quarter 10

3rd Quarter 10

4th Quarter 10

Average 0.0650 404930

Line 2 Line 2

Roof Monitors Roof Monitors 

Monthly Monthly

Average Average

mg/dscf dscf/min

Mar. 2011 0.0968 2103585
 DOE MONTHLY POTROOMS REPORT

ALCOA WENATCHEE

March 2011

3. Average particulate emission to production ratio ( lbs / ton Al )

Line / Plant Permit Limit 

Line / Plant Line / Plant PM Emission to PM Emission to

 Total Particulate AL Production Production Ratio Production Ratio 

lbs per day tons / Day lbs PM / Ton Al lbs PM / ton AL

Line 1 856.2 133.50 6.4

Line 2 730.1 70.35 10.4

Line 5 734.5 166.25 4.4

Plant Totals 2320.7 370.1 6.3 15.0

4. Average fluoride content of particulate emissions (percent)

Line / Plant Line / Plant Line / Plant

 Total Particulate Total Fluoride

Fluoride Particulate Particulate in

lbs per day lbs per day Percent

Line 2 67.0 730.06 9.2

5. Gaseous fluoride roof vent emission rate (ug/m3)

Roof Monitor Roof Monitor

Daily Maximum Monthly Average

ug GF/m3 ug GF/m3

Line 2 1062 659

6. Average gaseous F emission rate (lbs F/day)

Control Device (Dry 

Scrubber) 

Rolling avg 

Roof Monitors 

Opsis 

Monthly Avg.

Line / Plant 

Gaseous Fluoride 

lbs GF / day lbs GF /day lbs / day

Line 1 0.362 113.504 113.866

Line 2 1.433 113.040 114.473

Line 5 14.948 71.856 86.804

Plant Totals 315.1
 DOE MONTHLY POTROOMS REPORT

ALCOA WENATCHEE

March 2011

7. Average TF emission rate (lbs / ton aluminum)

Control Device 

(Dry Scrubber) 

Rolling avg 

Potline Roof 

Monitor Total by Line Permit Limit

lbs TF / ton lbs TF / ton lbs TF / ton lbs TF / ton

Line 2 0.1797 2.3999 2.6 1.9***

*** Line 2 was in startup and operated in compliance with WDOE Administrative Order Docket Number 8301

8. Average SO2 emission rate (lbs / ton aluminum)

Total by Line Permit Limit Total by Line Permit Limit

lbs SO2 / ton lbs SO2 / ton ton SO2 / Month Ton SO2 / Year

Line 1 Apr. 10 37.7 46 lbs 76.0

Line 1 May 10 28.9 46 lbs 60.4

Line 1 Jun. 10 31.0 46 lbs 61.3

Line 1 Jul. 10 35.7 46 lbs 70.0

Line 1 Aug. 10 36.6 46 lbs 73.3

Line 1 Sept. 10 36.7 46 lbs 72.4

Line 1 Oct. 10 33.3 46 lbs 67.9

Line 1 Nov. 10 32.9 46 lbs 65.3

Line 1 Dec. 10 33.2 46 lbs 67.9

Line 1 Jan. 11 34.4 46 lbs 71.5

Line 1 Feb. 11 29.5 46 lbs 54.9

Line 1 Mar. 11 36.5 46 lbs 75.4

Line 2 Apr. 10 46 lbs

Line 2 May 10 46 lbs

Line 2 Jun. 10 46 lbs

Line 2 Jul. 10 46 lbs

Line 2 Aug. 10 46 lbs

Line 2 Sept. 10 46 lbs

Line 2 Oct. 10 46 lbs

Line 2 Nov. 10 46 lbs

Line 2 Dec. 10 46 lbs

Line 2 Jan. 11 46 lbs

Line 2 Feb. 11 46 lbs

Line 2 Mar. 11 36.5 46 lbs 28.2

Year Total Lines 1 & 2 844.68 2900

8. Average SO2 emission rate (lbs / ton aluminum) (continued)

 Plant Total Permit Limit

lbs SO2 / ton Al lbs SO2 / ton

Plant Mar. 2011 54.3 60 lbs

9. Sulfur dioxide mass limit (raw materials and sulfur analysis)

Petroleum Coke(mt) Percent Sulfur Coal Tar Pitch(mt) Percent Sulfur

Mar. 2011 5444 2.57 1346 0.59
 DOE MONTHLY POTROOMS REPORT

ALCOA WENATCHEE

March 2011

10. Minimum pot cycle average air flow rate (ACFM)

Minimum Flows (ACFM)

Control Device MACT Minimum 

Line 2 311,393 ACFM 310,000 ACFM

11. Minimum pot cycle average alumina flow rate (Minutes / Revolutions)

Minimum Minimum Pot Cycle Average Pot Cycle Average Ore 

Line 2 4,732 Minutes 189 Tons 3,110 Minutes 168.7 Tons

AVERAGE EMISSION RATES WERE DETERMINED FROM SAMPLING FOLLOWING LOCATIONS:

FOUR QUARTER

CONTROL DEVICE ROOF VENT

CONTROL DEVICE ROLLING AVG. CEM DATA

EMISSION DATA DATE LAST UNIT FOR FLUORIDE ROOF VENT DATES ROOF

SUPPLIED FROM SAMPLED SUPPLIED FROM SAMPLED VENT SAMPLED

Line 2 Mar. 2, 2011 Line 2 LINE 2 RM 8 - OPSIS All Valid Potcycles

 TOTAL POT DAYS OPERATED

LINE 2 2,660

Certification by Responsible Official

"Based on information and belief formed after reasonable inquiry, the statements and information in this document

 are true, accurate and complete."

Signature of Responsible Official Date
 DOE MONTHLY POTROOMS REPORT

ALCOA WENATCHEE

April 2011

1. Average aluminum production rate ( tons aluminum / day )

Aluminum Aluminum 

 Production Production

lbs / day tons / day

Line 2 191,467 96

2. Particulate emission rate ( lbs / day, Concentration & Airflows) Monitor 

Control Device Roof Monitors 

(Dry Scrubber) Monthly Line

Rolling avg Average Total Particulate

lbs PM /day lbs PM /day lbs PM /day 

Line 2 55.2 746.6 801.9

Line 2 Line 2

Control Device Control Device

(Dry Scrubber) (Dry Scrubber) 

Rolling avg Rolling avg 

mg/dscf dscf/min

1st Quarter 11 0.0650 404930

2nd Quarter 11 0.0201 413235

3rd Quarter 10

4th Quarter 10

Average 0.0425 409083

Line 2 Line 2

Roof Monitors Roof Monitors 

Monthly Monthly

Average Average

mg/dscf dscf/min

April 2011 0.0907 2593513
 DOE MONTHLY POTROOMS REPORT

ALCOA WENATCHEE

April 2011

3. Average particulate emission to production ratio ( lbs / ton Al )

Line / Plant Permit Limit 

Line / Plant Line / Plant PM Emission to PM Emission to

 Total Particulate AL Production Production Ratio Production Ratio 

lbs per day tons / Day lbs PM / Ton Al lbs PM / ton AL

Line 1 811.8 129.07 6.3

Line 2 801.9 95.73 8.4

Line 5 930.8 163.61 5.7

Plant Totals 2544.5 388.4 6.6 15.0

4. Average fluoride content of particulate emissions (percent)

Line / Plant Line / Plant Line / Plant

 Total Particulate Total Fluoride

Fluoride Particulate Particulate in

lbs per day lbs per day Percent

Line 2 75.8 801.86 9.4

5. Gaseous fluoride roof vent emission rate (ug/m3)

Roof Monitor Roof Monitor

Daily Maximum Monthly Average

ug GF/m3 ug GF/m3

Line 2 789 472

6. Average gaseous F emission rate (lbs F/day)

Control Device (Dry 

Scrubber) 

Rolling avg 

Roof Monitors 

Opsis 

Monthly Avg.

Line / Plant 

Gaseous Fluoride 

lbs GF / day lbs GF /day lbs / day

Line 1 0.238 91.380 91.618

Line 2 0.844 104.788 105.632

Line 5 16.472 86.288 102.760

Plant Totals 300.0
 DOE MONTHLY POTROOMS REPORT

ALCOA WENATCHEE

April 2011

7. Average TF emission rate (lbs / ton aluminum)

Control Device 

(Dry Scrubber) 

Rolling avg 

Potline Roof 

Monitor Total by Line Permit Limit

lbs TF / ton lbs TF / ton lbs TF / ton lbs TF / ton

Line 2 0.0760 1.8189 1.9 1.9

8. Average SO2 emission rate (lbs / ton aluminum)

Total by Line Permit Limit Total by Line Permit Limit

lbs SO2 / ton lbs SO2 / ton ton SO2 / Month Ton SO2 / Year

Line 1 May 10 28.9 46 lbs 60.4

Line 1 Jun. 10 31.0 46 lbs 61.3

Line 1 Jul. 10 35.7 46 lbs 70.0

Line 1 Aug. 10 36.6 46 lbs 73.3

Line 1 Sept. 10 36.7 46 lbs 72.4

Line 1 Oct. 10 33.3 46 lbs 67.9

Line 1 Nov. 10 32.9 46 lbs 65.3

Line 1 Dec. 10 33.2 46 lbs 67.9

Line 1 Jan. 11 34.4 46 lbs 71.5

Line 1 Feb. 11 29.5 46 lbs 54.9

Line 1 Mar. 11 36.5 46 lbs 75.4

Line 1 Apr. 11 31.7 46 lbs 61.4

Line 2 May 10 46 lbs

Line 2 Jun. 10 46 lbs

Line 2 Jul. 10 46 lbs

Line 2 Aug. 10 46 lbs

Line 2 Sept. 10 46 lbs

Line 2 Oct. 10 46 lbs

Line 2 Nov. 10 46 lbs

Line 2 Dec. 10 46 lbs

Line 2 Jan. 11 46 lbs

Line 2 Feb. 11 46 lbs

Line 2 Mar. 11 36.5 46 lbs 28.2

Line 2 Apr. 11 31.7 46 lbs 45.6

Year Total Lines 1 & 2 875.61 2900

8. Average SO2 emission rate (lbs / ton aluminum) (continued)

 Plant Total Permit Limit

lbs SO2 / ton Al lbs SO2 / ton

Plant Apr. 2011 47.0 60 lbs

9. Sulfur dioxide mass limit (raw materials and sulfur analysis)

Petroleum Coke(mt) Percent Sulfur Coal Tar Pitch(mt) Percent Sulfur

Apr. 2011 5307 2.49 1025 0.59
 DOE MONTHLY POTROOMS REPORT

ALCOA WENATCHEE

April 2011

10. Minimum pot cycle average air flow rate (ACFM)

Minimum Flows (ACFM)

Control Device MACT Minimum 

Line 2 340,672 ACFM 310,000 ACFM

11. Minimum pot cycle average alumina flow rate (Minutes / Revolutions)

Minimum Minimum Pot Cycle Average Pot Cycle Average Ore 

Line 2 5,191 Minutes 208 Tons 3,110 Minutes 168.7 Tons

AVERAGE EMISSION RATES WERE DETERMINED FROM SAMPLING FOLLOWING LOCATIONS:

FOUR QUARTER

CONTROL DEVICE ROOF VENT

CONTROL DEVICE ROLLING AVG. CEM DATA

EMISSION DATA DATE LAST UNIT FOR FLUORIDE ROOF VENT DATES ROOF

SUPPLIED FROM SAMPLED SUPPLIED FROM SAMPLED VENT SAMPLED

Line 2 Apr. 12, 2011 Line 2 LINE 2 RM 8 - OPSIS All Valid Potcycles

 TOTAL POT DAYS OPERATED

LINE 2 3,452

Certification by Responsible Official

"Based on information and belief formed after reasonable inquiry, the statements and information in this document

 are true, accurate and complete."

Signature of Responsible Official Date