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e s t h a t c o m p li a n c e wi t h t h e s t a n da r d m u s t b e d e m o n s t r a t e d m o n t h l y

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# (a) (b) (c)

Lead Concentration Flow Rate Contribution

Source (mg/dscm) (dscf) Per Source Test Date

Busch Unit A 0.0006 40,656 24.39360 April, 2009

Busch Unit B 0.000704 39,486 27.79814 February, 2010

Busch Unit C 0.0017 27,237 46.30290 February, 2010

Busch Unit D 0.0013 18,031 23.44030 May, 2009

Busch Unit E 0.00049 36,000 17.64000 February, 2010

Busch Unit F 0.0011 36,055 39.66050 April, 2009

Busch Unit G 0.00285 33,464 95.37240 May, 2009

Busch Unit H 0.000414 35,460 14.68044 February, 2010

Busch Unit I 0.000661 32,227 21.30205 April, 2009

WESP Stack 0.00145 84,869 123.06005 November, 2010

Facility-Wide Totals 0.011269 383,485 433.65038

0.0011 Flow Weighted Average Demonstration - Privileged & Confidential

Summary of Lead Emission Rates - COI

Flow-Weighted Average = ∑ [(a) x (b)]

------------- ∑ (b)

Calculation Explanation: The calulation is performed according to the follo wing procedure:

1. Obtain the most recent agency-approved stack te st lead concentration (mg/dscm) and

flow rate (dscf) from the most recent test for each point source at the secondary lead

smelting facility.

2. For each point source, multiply the lead concen tration by the flow rate to determine the

contribution per point source.

3. Sum the contributions per point source for the entire facility.

4. Sum the flow rates for all point sources at the facility.

5. Divide the sum of the contributions per point s ource by the sum of the flow rates for all

point sources

6. The result is the Flow-Weighted Average for the facility.