### Instructions

Sample and analyze the particulate matter collected in the hopper from each bag house or electrostatic precipitator (ESP) used to control particulate matter from potlines. Where more than one bag house or ESP discharges solids to a common hopper, a single sample will be adequate. In cases where solids from different compartments of a single bag house or ESP are collected in multiple hoppers or multiple collection sacks, a single composite sample will be adequate.
If a wet scrubber is used to control emissions from a potline, sample and analyze the scrubber sludge removed from the scrubber, and estimate the annual mass (dry basis) of this sludge. In addition, if applicable, sample and analyze the slurry injected into the scrubber and estimate the annual mass (dry basis) of the injected slurry. Finally, if there is an aqueous discharge or blowdown stream from the scrubber, sample and analyze the this liquid and estimate the annual volume discharged.
You must report the results of these chemical analyses in this Microsoft® Excel Emission Test Template. If more than one source was tested, you must make a copy of the worksheet and update the source ID in order to distinguish between each separate source of particulate matter. After completing the worksheet, you must also submit an electronic copy of the emission test report and the chemical analyses. (PDF format preferred).

## Electrostatic Precipitator Dust

**Facility Name and A ddress**  **Unit Description Process Unit ID**  **Control Device ID*** Century Alum inumof Kentucky GP 432001 1627 State Route 271 North Hawesville, KY 42348

**Sample ID # AL** **17850 AL** **17859 AL** **19047 AL** **19057 AL** **19067 Date Sampled**  **4/19/2011 4/20/2011**  **4/21/2011 4/25/2011**  **4/26/2011 Date(s) A** **nalyzed 5/26/2011**  **5/26/2011 5/27/2011**  **5/27/2011 5/27/2011**  **HA P Metal**  Antim ony 9.34 m g/kg (BDU) 12.5 m g/kg (BD) 8.36 m g/kg (DU) 7.68 m g/kg (DU) 6.17 m g/kg (DU) Beryllium 55.1 m g/kg (D) 61.4 m g/kg (D) 53.5 m g/kg (D) 54.2 m g/kg (D) 54.1 m g/kg (D) Chrom ium 18.7 m g/kg (DU) 18.6 m g/kg (D) 16.7 m g/kg (DU) 15.4 m g/kg (DU) 12.3 m g/kg (DU) Hexavalent chrom ium 3.46 ug/kg (U) 94.6 ug/kg 3.93 ug/kg (U) 3.85 ug/kg (U) 3.88 ug/kg (U) Lead 78.5 m g/kg (D) 112 m g/kg (D) 88.6 m g/kg (D) 84.5 m g/kg (D) 77.7 m g/kg (D) Selenium 9.34 m g/kg (DU) 9.32 m g/kg (DU) 8.36 m g/kg (DU) 7.68 m g/kg (DU) 6.17 m g/kg (DU) Arsenic 19.4 m g/kg (D) 30.7 m g/kg (D) 23.1 m g/kg (D) 23.7 m g/kg (D) 21.7 m g/kg (D) Cadm ium 4.67 m g/kg (DU) 4.66 m g/kg (DU) 4.18 m g/kg (DU) 3.84 m g/kg (DU) 3.08 m g/kg (DU) Cobalt 30.6 m g/kd (D) 50.3 m g/kg (D) 32.8 m g/kg (D) 33.6 m g/kg (DU) 29.7 m g/kg (D) Manganese 18.7 m g/kg (DU) 18.6 m g/kg (DU) 16.7 m g/kg (DU) 15.4 m g/kg (DU) 12.3 m g/kg (DU) Nickel 613 m g/kg (D) 888 m g/kg (D) 624 m g/kg (D) 599 m g/kg (D) 567 m g/kg (D)

*** Enter multiple control device ID Nos. if the results apply to mulitiple control devices.**

B = Blank Contam ination D = Results Reported fromDilution U = Non-detect at the reported detection lim its M = Matrix spike and/or m atrix spike duplicate recovery outsideacceptance lim its Lines 1 thru 4 Air Control System 424200, 424220,

424230, 424240

## Dry

**A lumina Scrubber/Bag House Inlet Feed A** **lumina**

**Facility Name and A ddress**  **Unit Description Process Unit ID**  **Control Device ID*** Century Alum inumof Kentucky GP 480063, 330140 1627 State Route 271 North Hawesville, KY 42348

**Sample ID # AL** **17847 AL** **17856 AL** **19044 AL** **19054 AL** **19064 Date Sampled**  **4/19/2011 4/20/2011**  **4/21/2011 4/25/2011**  **4/26/2011 Date(s) A** **nalyzed 5/26/2011**  **5/26/2011 5/26/2011**  **5/27/2011 5/27/2011**  **HA P Metal**  Antim ony 10.3 m g/kg (BD) 9.67 m g/kg (BDU) 9.79 m g/kg (BDU) 8.33 m g/kg (DU) 8.91 m g/kg (DU) Beryllium 4.13 m g/kg (DU) 4.84 m g/kg (DU) 4.9 mg/kg (DU) 4.16 m g/kg (DU) 4.46 m g/kg (DU) Chrom ium 16.5 m g/kg (DU) 19.3 m g/kg (DU) 19.6 m g/kg (DU) 16.7 m g/kg (DU) 17.8 m g/kg (DU) Hexavalent chrom ium 77.2 ug/kg 28.0 ug/kg 29.2 ug/kg 27.7 ug/kg 27.2 ug/kg Lead 4.13 m g/kg (DU) 4.84 m g/kg (DU) 34.9 m g/kg (DU) 4.16 m g/kg (DU) 4.46 m g/kg (DU) Selenium 8.26 m g/kg (DU) 9.67 m g/kg (DU) 9.79 m g/kg (DU) 8.33 m g/kg (DU) 8.91 m g/kg (DU) Arsenic 4.13 m g/kg (DU) 4.84 m g/kg (DU) 4.9 mg/kg (DU) 4.16 m g/kg (DU) 4.46 m g/kg (DU) Cadm ium 4.13 m g/kg (DU) 4.84 m g/kg (DU) 4.9 mg/kg (DU) 4.16 m g/kg (DU) 4.46 m g/kg (DU) Cobalt 16.5 m g/kg (DU) 19.3 m g/kg (DU) 19.6 m g/kg (DU) 39 m g/kg (DU) 17.8 m g/kg (DU) Manganese 16.5 m g/kg (DU) 19.3 m g/kg (DU) 19.6 m g/kg (DU) 16.7 m g/kg (DU) 17.8 m g/kg (DU) Nickel 4.13 m g/kg (DU) 4.84 m g/kg (DU) 4.9 mg/kg (DU) 4.16 m g/kg (DU) 4.46 m g/kg (DU)

*** Enter multiple control device ID Nos. if the results apply to mulitiple control devices.**

B = Blank Contam ination D = Results Reported fromDilution U = Non-detect at the reported detection lim its M = Matrix spike and/or m atrix spike duplicate recovery outsideacceptance lim its Inlet Alum ina to Carbon Bake & Line 5 Dry Scrubbers 424250, 333301,

333302, 333307

## Dry A**lumina Scrubber/Bag House combination Dust Outlet**

**Facility Name and A ddress**  **Unit Description Process Unit ID**  **Control Device ID*** Century Aluminum of Kentucky GP 480063 1627 State Route 271 North Hawesville, KY 42348

**Sample ID # AL** **17849 AL** **17858 AL** **19046 AL** **19056 AL** **19066 Date Sampled**  **4/19/2011 4/20/2011**  **4/21/2011 4/25/2011**  **4/26/2011 Date(s) A** **nalyzed 5/26/2011**  **5/26/2011 5/27/2011**  **5/27/2011 5/27/2011**  **HA P Metal**  Antimony 9.86 mg/kg (BDU) 9.38 mg/kg (BDU) 8.1 mg/kg (DU) 9 mg/kg (DU) 8.92 mg/kg (DU) Beryllium 4.93 mg/kg (DU) 4.69 mg/kg (DU) 4.05 mg/kg (DU) 4.5 mg/kg (DU) 4.46 mg/kg (DU) Chromium 19.7 mg/kg (DU) 18.8 mg/kg (DU) 16.2 mg/kg (DU) 18 mg/kg (DU) 17.8 mg/kg (DU) Hexavalent chromium 3.89 ug/kg (U) 3.62 ug/kg (U) 4.11 ug/kg 3.84 ug/kg 3.45 ug/kg (U) Lead 4.93 mg/kg (DU) 4.69 mg/kg (DU) 7.38 mg/kg (D) 4.5 mg/kg (DU) 4.46 mg/kg (DU) Selenium 9.86 mg/kg (DU) 9.38 mg/kg (DU) 8.1 mg/kg (DU) 9 mg/kg (DU) 8.92 mg/kg (DU) Arsenic 4.93 mg/kg (DU) 4.69 mg/kg (DU) 4.05 mg/kg (DU) 4.54 mg/kg (D) 6.11 mg/kg (D) Cadmium 4.93 mg/kg (DU) 4.69 mg/kg (DU) 4.05 mg/kg (DU) 4.5 mg/kg (DU) 4.46 mg/kg (DU) Cobalt 19.7 mg/kg (DU) 18.8 mg/kg (DU) 16.2 mg/kg (DU) 32.7 mg/kg (DU) 17.8 mg/kg (DU) Manganese 19.7 mg/kg (DU) 18.8 mg/kg (DU) 16.2 mg/kg (DU) 18 mg/kg (DU) 17.8 mg/kg (DU) Nickel 52.8 mg/kg (D) 36.4 mg/kg (D) 41.4 mg/kg (D) 58.4 mg/kg (D) 47.4 mg/kg (D)

*** Enter multiple control device ID Nos. if the results apply to mulitiple control devices.**

B = Blank Contamination D = Results Reported from Dilution U = Non-detect at the reported detection limits M = Matrix spike and/or matrix spike duplicate recovery outsideacceptance limits Line 5 Dry Scrubber 424250

## Dry

**A lumina Scrubber/Bag House combination Dust Outlet** 

**Facility Name and A ddress**  **Unit Description Process Unit ID**  **Control Device ID*** Century Alum inumof Kentucky GP 330140 1627 State Route 271 North Hawesville, KY 42348

**Sample ID # AL** **17848 AL** **17857 AL** **19045 AL** **19055 AL** **19065 Date Sampled**  **4/19/2011 4/20/2011**  **4/21/2011 4/25/2011**  **4/26/2011 Date(s) A** **nalyzed 5/26/2011**  **5/26/2011 5/26/2011**  **5/27/2011 5/27/2011**  **HA P Metal**  Antim ony 9.75 m g/kg (BDU) 9.54 m g/kg (BDU) 13.2 m g/kg (BD) 7.15 m g/kg (DU) 7.67 m g/kg (DU) Beryllium 4.87 m g/kg (DU) 4.77 m g/kg (DU) 4.54 m g/kg (DU) 3.58 m g/kg (DU) 3.84 m g/kg (DU) Chrom ium 19.5 m g/kg (DU) 19.1 m g/kg (DU) 18.1 m g/kg (DU) 14.3 m g/kg (DU) 15.3 m g/kg (DU) Hexavalent chrom ium 3.29 ug/kg (U) 3.85 ug/kg (U) 3.39 ug/kg (U) 3.81 ug/kg (U) 3.85 ug/kg (U) Lead 23.0 m g/kg (D) 28.2 m g/kg (D) 37.9 m g/kg (D) 31.0 m g/kg (D) 29.9 m g/kg (D) Selenium 9.75 m g/kg (DU) 9.54 m g/kg (DU) 9.07 m g/kg (DU) 7.15 m g/kg (DU) 7.67 m g/kg (DU) Arsenic 4.87 m g/kg (DU) 4.77 m g/kg (DU) 4.54 m g/kg (DU) 3.58 m g/kg (DU) 3.84 m g/kg (DU) Cadm ium 4.87 m g/kg (DU) 4.77 m g/kg (DU) 4.54 m g/kg (DU) 3.58 m g/kg (DU) 3.84 m g/kg (DU) Cobalt 19.5 m g/kg (DU) 19.1 m g/kg (DU) 18.1 m g/kg (DU) 37.9 m g/kg (DU) 15.3 m g/kg (DU) Manganese 19.5 m g/kg (DU) 19.1 m g/kg (DU) 18.1 m g/kg (DU) 14.3 m g/kg (DU) 15.3 m g/kg (DU) Nickel 4.87 m g/kg (DU) 4.77 m g/kg (DU) 0.877 m g/kg (DU) 3.58 m g/kg (DU) 3.84 m g/kg (DU)

*** Enter multiple control device ID Nos. if the results apply to mulitiple control devices.**

B = Blank Contam ination D = Results Reported fromDilution U = Non-detect at the reported detection lim its M = Matrix spike and/or m atrix spike duplicate recovery outsideacceptance lim its Carbon Bake Dry Alum ina Scrubber 333301, 333302, 333307

## Dry

**Coke Scrubber/Bag House combination Dust**

**Facility Name and A ddress**  **Unit Description Control Device ID** * Century Alum inumof Kentucky GP 310126 1627 State Route 271 North Hawesville, KY 42348

**Sample ID # AL** **17845 AL** **17854 AL** **19042 AL** **19052 AL** **19062 Date Sampled**  **4/19/2011 4/20/2011**  **4/21/2011 4/25/2011**  **4/26/2011 Date(s) A** **nalyzed 5/26/2011**  **5/26/2011 5/26/2011**  **5/27/2011 5/27/2011** 

**HA P Metal**  **INLET COKE TO SCRUBBER**  **INLET COKE TO**

**SCRUBBER INLET COKE TO** 

**SCRUBBER INLET COKE TO** 

**SCRUBBER INLET COKE TO** 

**SCRUBBER** Antim ony 8.96 m g/kg (BDU) 9.58 m g/kg (BDU) 9.03 m g/kg (BDU) 9.31 m g/kg (DU) 7.45 m g/kg (DU) Beryllium 4.48 m g/kg (DU) 4.79 m g/kg (DU) 4.51 m g/kg (DU) 4.66 m g/kg (DU) 3.73 m g/kg (DU) Chrom ium 17.9 m g/kg (DU) 19.2 m g/kg (DU) 18.1 m g/kg (DU) 18.6 m g/kg (DU) 14.9 m g/kg (DU) Hexavalent chrom ium 3.98 ug/kg (U) 3.97 ug/kg (U) 3.77 ug/kg (U) 3.96 ug/kg (U) 3.8 ug/kg (U) Lead 7.35 m g/kg (D) 4.79 m g/kg (DU) 4.51 m g/kg (DU) 4.66 m g/kg (DU) 3.73 m g/kg (DU) Selenium 8.96 m g/kg (DU) 9.58 m g/kg (DU) 9.03 m g/kg (DU) 9.31 m g/kg (DU) 7.45 m g/kg (DU) Arsenic 4.48 m g/kg (DU) 4.79 m g/kg (DU) 4.51 m g/kg (DU) 4.66 m g/kg (DU) 3.73 m g/kg (DU) Cadm ium 4.48 m g/kg (DU) 4.79 m g/kg (DU) 4.51 m g/kg (DU) 4.66 m g/kg (DU) 3.73 m g/kg (DU) Cobalt 17.9 m g/kg (DU) 19.2 m g/kg (DU) 18.1 m g/kg (DU) 37.2 m g/kg (DU) 14.9 m g/kg (DU) Manganese 17.9 m g/kg (DU) 19.2 m g/kg (DU) 18.1 m g/kg (DU) 18.6 m g/kg (DU) 14.9 m g/kg (DU) Nickel 5.52 m g/kg (D) 4.79 m g/kg (DU) 48.7 m g/kg (D) 4.66 m g/kg (DU) 3.73 m g/kg (DU)

*** Enter multiple control device ID Nos. if the results apply to mulitiple control devices.**

B = Blank Contam ination D = Results Reported fromDilution U = Non-detect at the reported detection lim its M = Matrix spike and/or m atrix spike duplicate recovery outsideacceptance lim its Green Carbon Dry Coke Scrubber **Process Unit ID** 310351, 310352, 310353, 310354, 310355, 310356, 310357, 310358, 310359, 310362, 310364, 312035, 312037, 310425, 312036, 312006,

310135, 312010

## Dry

**Coke Scrubber/Bag House combination Dust**

**Facility Name and A ddress**  **Unit Description Control Device ID** * Century Alum inumof Kentucky GP 310126 1627 State Route 271 North Hawesville, KY 42348

**Sample ID # AL** **17846 AL** **17855 AL** **19043 AL** **19053 AL** **19063 Date Sampled**  **4/19/2011 4/20/2011**  **4/21/2011 4/25/2011**  **4/26/2011 Date(s) A** **nalyzed 5/26/2011**  **5/26/2011 5/26/2011**  **5/27/2011 5/27/2011** 

**HA P Metal**  **OUTLET COKE FROM SCRUBBER**  **OUTLET COKE**

**FROM SCRUBBER OUTLET COKE** 

**FROM SCRUBBER OUTLET COKE** 

**FROM SCRUBBER OUTLET COKE** 

**FROM SCRUBBER** Antim ony 8.14 m g/kg (BDU) 14.7 m g/kg (BD) 9.85 m g/kg (BDU) 8.06 m g/kg (DU) 7.72 m g/kg (DU) Beryllium 4.07 m g/kg (DU) 4.69 m g/kg (DU) 4.93 m g/kg (DU) 4.03 m g/kg (DU) 3.86 m g/kg (DU) Chrom ium 16.3 m g/kg (DU) 18.7 m g/kg (DU) 19.7 m g/kg (DU) 16.1 m g/kg (DU) 15.4 m g/kg (DU) Hexavalent chrom ium 3.76 ug/kg (U) 3.97 ug/kg (U) 3.9 ug/kg (U) 3.94 ug/kg (U) 3.95 ug/kg (U) Lead 4.07 m g/kg (DU) 4.69 m g/kg (DU) 0.4 mg/kg (DU) 4.03 m g/kg (DU) 3.86 m g/kg (DU) Selenium 8.14 m g/kg (DU) 9.37 m g/kg (DU) 9.85 m g/kg (DU) 8.06 m g/kg (DU) 7.72 m g/kg (DU) Arsenic 4.07 m g/kg (DU) 4.69 m g/kg (DU) 4.93 m g/kg (DU) 4.03 m g/kg (DU) 3.86 m g/kg (DU) Cadm ium 4.07 m g/kg (DU) 4.69 m g/kg (DU) 4.93 m g/kg (DU) 4.03 m g/kg (DU) 3.86 m g/kg (DU) Cobalt 16.3 m g/kg (DU) 18.7 m g/kg (DU) 19.7 m g/kg (DU) 36.8 m g/kg (DU) 15.4 m g/kg (DU) Manganese 16.3 m g/kg (DU) 18.7 m g/kg (DU) 19.7 m g/kg (DU) 16.1 m g/kg (DU) 15.4 m g/kg (DU) Nickel 4.07 m g/kg (DU) 8.74 m g/kg (D) 5.87 m g/kg (D) 4.03 m g/kg (DU) 3.86 m g/kg (DU)

*** Enter multiple control device ID Nos. if the results apply to mulitiple control devices.**

B = Blank Contam ination D = Results Reported fromDilution U = Non-detect at the reported detection lim its M = Matrix spike and/or m atrix spike duplicate recovery outsideacceptance lim its

**Process Unit ID** Green Carbon Dry Coke Scrubber 310351, 310352, 310353, 310354, 310355, 310356, 310357, 310358, 310359, 310362, 310364, 312035, 312037, 310425, 312036, 312006,

310135, 312010

## Wet Scrubber Sludge

**Facility Name and A** **ddress Unit Description**  **Process Unit ID Control Device ID** *

Century Aluminum of Kentucky GP Lines 1 thru 4 Air Control System 424200, 424220,

424230, 424240 432001 1627 State Route 271 North Hawesville, KY 42348

**Sample ID # AL** **17861 AL** **17860 AL** **19048 AL** **19058 Date Sampled**  **4/19/2011 4/20/2011**  **4/21/2011 4/25/2011**  **Date(s) A naly** **zed 5/26/2011**  **5/26/2011 5/27/2011**  **5/27/2011 HA** **P Metal** Antimony 15.8 mg/kg (BDU) 11 mg/kg (BDU) 11.4 mg/kg (DU) 11.5 mg/kg (DU) Beryllium 7.88 mg/kg (DU) 5.5 mg/kg (DU) 5.72 mg/kg (DU) 5.74 mg/kg (DU) Chromium 31.5 mg/kg (DU) 22 mg/kg (DU) 22.9 mg/kg (DU) 23 mg/kg (DU) Hexavalent chromium 5.4 ug/kg (U) 6.05 ug/kg 4.57 ug/kg (U) 10.5 ug/kg Lead 7.88 mg/kg (DU) 5.5 mg/kg (DU) 5.72 mg/kg (DU) 5.74 mg/kg (DU) Selenium 15.8 mg/kg (DU) 11 mg/kg (DU) 11.4 mg/kg (DU) 11.5 mg/kg (DU) Arsenic 6.24 mg/kg (D) 5.5 mg/kg (DU) 9.73 mg/kg (D) 14.0 mg/kg (D) Cadmium 7.88 mg/kg (DU) 5.5 mg/kg (DU) 5.72 mg/kg (DU) 5.74 mg/kg (DU) Cobalt 31.5 mg/kg (DU) 22 mg/kg (DU) 22.9 mg/kg (DU) 51.1 mg/kg (DU) Manganese 31.5 mg/kg (DU) 22 mg/kg (DU) 35.1 mg/kg (D) 39.3 mg/kg (D) Nickel 7.88 mg/kg (DU) 5.5 mg/kg (DU) 5.72 mg/kg (DU) 5.74 mg/kg (DU)

*** Enter multiple control device ID Nos. if the results apply to mulitiple control devices.**

Annual mass of sludge (dry basis) removed from scrubber (kg)

B = Blank Contamination D = Results Reported from Dilution U = Non-detect at the reported detection limits M = Matrix spike and/or matrix spike duplicate recovery outsideacceptance limits 15,552,000

### AL**19068**

**4/26/2011 5/27/2011** 

9.26 mg/kg (DU) 4.63 mg/kg (DU) 18.5 mg/kg (DU) 26.2 ug/kg 4.63 mg/kg (DU) 9.26 mg/kg (DU) 7.15 mg/kg (D) 4.63 mg/kg (DU) 18.5 mg/kg (DU) 24.9 mg/kg (D) 9.81 mg/kg (D)

## Wet Scrubber Lime Tank

**Facility Name and A** **ddress Unit Description**  **Process Unit ID Control Device ID** *

Century Aluminum of Kentucky GP Lines 1 thru 4 Air Control System 424200, 424220,

424230, 424240 432001 1627 State Route 271 North Hawesville, KY 42348

**Sample ID # AL** **17851 AL** **17862 AL** **19049 AL** **19059 Date Sampled**  **4/19/2011 4/20/2011**  **4/21/2011 4/25/2011**  **Date(s) A naly** **zed 5/26/2011**  **5/26/2011 5/27/2011**  **5/27/2011 HA** **P Metal** Antimony 9.74 mg/kg (BDU) 9.12 mg/kg (BDU) 9.37 mg/kg (DU) 8.82 mg/kg (DU) Beryllium 4.87 mg/kg (DU) 4.56 mg/kg (DU) 4.69 mg/kg (DU) 4.41 mg/kg (DU) Chromium 19.5 mg/kg (DU) 18.2 mg/kg (DU) 18.7 mg/kg (DU) 617 mg/kg (D) Hexavalent chromium 190 ug/kg 24.3 ug/kg 200 ug/kg 211 ug/kg Lead 4.87 mg/kg (DU) 4.56 mg/kg (DU) 4.69 mg/kg (DU) 4.41 mg/kg (DU) Selenium 9.74 mg/kg (DU) 9.12 mg/kg (DU) 9.37 mg/kg (DU) 8.82 mg/kg (DU) Arsenic 4.87 mg/kg (DU) 8.62 mg/kg (DU) 4.69 mg/kg (DU) 4.41 mg/kg (DU) Cadmium 4.87 mg/kg (DU) 4.56 mg/kg (DU) 4.69 mg/kg (DU) 4.41 mg/kg (DU) Cobalt 19.5 mg/kg (DU) 18.2 mg/kg (DU) 36.1 mg/kg (DU) 44.4 mg/kg (DU) Manganese 22.3 mg/kg (D) 22.0 mg/kg (D) 20.3 mg/kg (D) 21.2 mg/kg (D) Nickel 4.87 mg/kg (DU) 4.56 mg/kg (DU) 4.69 mg/kg (DU) 4.41 mg/kg (DU)

*** Enter multiple control device ID Nos. if the results apply to mulitiple control devices.**

Annual mass of sludge (dry basis) removed from scrubber (kg)

B = Blank Contamination D = Results Reported from Dilution U = Non-detect at the reported detection limits M = Matrix spike and/or matrix spike duplicate recovery outsideacceptance limits 4,083,000 kg Lime Used

### AL**19069**

**4/26/2011 5/27/2011** 

6.9 mg/kg (DU) 3.45 mg/kg (DU) 13.8 mg/kg (DU) 202 ug/kg 3.45 mg/kg (DU) 6.9 mg/kg (DU) 3.45 mg/kg (DU) 3.45 mg/kg (DU) 13.8 mg/kg (DU) 19.7 mg/kg (D) 4.27 mg/kg (D)

## Wet Scrubber Lime Injected Slurry

**Facility Name and A** **ddress Unit Description**  **Process Unit ID Control Device ID** *

Century Aluminum of Kentucky GP Lines 1 thru 4 Air Control System 424200, 424220,

424230, 424240 432001 1627 State Route 271 North Hawesville, KY 42348

**Sample ID # AL** **17843 AL** **17852 AL** **19040 AL** **19050 Date Sampled**  **4/19/2011 4/20/2011**  **4/21/2011 4/25/2011**  **Date(s) A naly** **zed 5/27/2011**  **5/27/2011 5/27/2011**  **5/27/2011 HA** **P Metal** Antimony 0.027 mg/l (MBD) 0.144 mg/l (D) 0.02 mg/l (BDU) 0.02 mg/l (BDU) Beryllium 0.02 mg/l (MDU) 0.02 mg/l (DU) 0.02 mg/l (DU) 0.02 mg/l (DU) Chromium 0.84 mg/l (MD) 0.195 mg/l (D) 0.232 mg/l (D) 0.627 mg/l (D) Hexavalent chromium 130 ug/l (D) 118 ug/l (D) 140 ug/ml (D) 131 ug/l (D) Lead 0.040 mg/l (MD) 0.02 mg/l (DU) 0.02 mg/l (DU) 0.02 mg/l (DU) Selenium 0.02 mg/l (MDU) 0.02 mg/l (DU) 0.02 mg/l (DU) 0.032 mg/l (D) Arsenic 0.036 mg/l (MD) 0.02 mg/l (DU) 0.02 mg/l (DU) 0.028 mg/l (D) Cadmium 0.0121 mg/l (MD) 0.005 mg/l (DU) 0.005 mg/l (DU) 0.005 mg/l (DU) Cobalt 0.051 mg/l (MD) 0.02 mg/l (DU) 0.02 mg/l (DU) 0.02 mg/l (DU) Manganese 1.560 mg/l (MD) 0.385 mg/l (D) 0.395 mg/l (D) 1.180 mg/l (D) Nickel 0.191 mg/l (MD) 0.043 mg/l (D) 0.048 mg/l (D) 0.270 mg/l (D)

*** Enter multiple control device ID Nos. if the results apply to mulitiple control devices.**

Annual mass of sludge (dry basis) removed from scrubber (kg) See Lime Used

B = Blank Contamination D = Results Reported from Dilution U = Non-detect at the reported detection limits M = Matrix spike and/or matrix spike duplicate recovery outsideacceptance limits

### AL**19060**

**4/26/2011 5/27/2011** 

0.111 mg/l (D) 0.02 mg/l (DU) 0.325 mg/l (D) 101 ug/l (D) 0.02 mg/l (DU) 0.02 mg/l (DU) 0.02 mg/l (DU) 0.005 mg/l (DU) 0.02 mg/l (DU) 0.610 mg/l (D) 0.150 mg/l (D)

## Wet Scrubber Blow**dow n** 
**Facility Name and A** **ddress Unit Description**  **Process Unit ID Control Device ID** *

Century Aluminum of Kentucky GP Lines 1 thru 4 Air Control System 424200, 424220,

424230, 424240 432001 1627 State Route 271 North Hawesville, KY 42348

**Sample ID # AL** **17844 AL** **17853 AL** **19041 AL** **19051 Date Sampled**  **4/19/2011 4/20/2011**  **4/21/2011 4/25/2011**  **Date(s) A naly** **zed 5/27/2011**  **5/27/2011 5/27/2011**  **5/27/2011 HA** **P Metal** Antimony 0.034 mg/l (D) 0.02 mg/l (BDU) 0.028 mg/l (BD) 0.02 mg/l (BDU) Beryllium 0.136 mg/l (D) 0.02 mg/l (DU) 0.168 mg/l (D) 0.041 mg/l (D) Chromium 1.16 mg/l (D) 0.225 mg/l (D) 0.953 mg/l (D) 0.463 mg/l (D) Hexavalent chromium 206 ug/l (D) 128 ug/l (D) 32.4 ug/ml (D) 122 ug/l (D) Lead 0.381 mg/l (D) 0.214 mg/l (D) 0.419 mg/l (D) 0.145 mg/l (D) Selenium 0.116 mg/l (D) 0.309 mg/l (D) 0.109 mg/l (D) 0.036 mg/l (D) Arsenic 0.324 mg/l (D) 0.439 mg/l (D) 0.299 mg/l (D) 0.118 mg/l (D) Cadmium 0.0988 mg/l (D) 0.005 mg/l (DU) 0.0842 mg/l (D) 0.0116 mg/l (D) Cobalt 0.102 mg/l (D) 0.02 mg/l (DU) 0.112 mg/l (D) 0.033 mg/l (D) Manganese 4.170 mg/l (D) 2.920 mg/l (D) 4.460 mg/l (D) 1.600 mg/l (D) Nickel 4.44 mg/l (D) 2.580 mg/l (D) 3.980 mg/l (D) 1.390 mg/l (D)

*** Enter multiple control device ID Nos. if the results apply to mulitiple control devices.**

Annual mass of sludge (dry basis) removed from scrubber (kg)

B = Blank Contamination D = Results Reported from Dilution U = Non-detect at the reported detection limits M = Matrix spike and/or matrix spike duplicate recovery outsideacceptance limits See Wet Scrubber Sludge

### AL**19061**

**4/26/2011 5/27/2011** 

0.02 mg/l (BMDU) 0.065 mg/l (DM) 0.722 mg/l (MD) 147 ug/l (D) 0.202 mg/l (DM) 0.130 mg/l (MD) 0.211 mg/l (MD) 0.0174 mg/l (MD) 0.049 mg/l (MD) 2.200 mg/l (MD) 1.79 mg/l (MD)