Attachment A

Excess Emission Quantification Methodologies

Calculation Methodologies to Determine Number of VOC Mobile Source

Emission Reduction Credits Needed to Offset Excess Emissions when Rule

1610 is Used as an Alternative Method of Compliance with Rules 1124,

1142, 1151, 1168, and 1171.

Calculation Methodology applicable for Rules 1124, 1151, and 1168.

MSERCs = EE = Q d~ (i — Sa)E (VOCa)(1_CEa) - (VOCr)(TEa)(1 -CEr) [ (1_Sa)(da) (1— Sr)(dr)(TEr)

Where:

MSERCs = Rule 1610 VOC Mobile Source Emission Reduction Credits in pounds.

EE = excess emissions in pounds ofVOC.

da = density of applied material in pounds per gallon including VOC, water,

exempt compounds, and solids.

dr = density ofrequired material in pounds per gallon including VOC, water,

exempt compounds, and solids.

Q = quantity of applied material in gallons over a specified time period

including VOC, water, exempt compounds, and solids.

Sa = solvent fraction of applied material in pounds of liquid (VOC, water, and

exempt compounds) per pound of applied material.

Sr = solvent fraction ofrequired material in pounds of liquid (VOC, water, and

exempt compounds) per pound of applied material.

A-i
VOCa = pounds ofVOC per gallon of applied material including VOC, water,

exempt compounds. and solids.

VOCr = pounds ofVOC per gallon ofrequired material including VOC, water,

exempt compounds. and solids.

TEa = actual transfer efficiency of applied coating in pounds of solid attached per

pounds of solid applied.

TEr required transfer efficiency of applied coating in pounds of solid attached

per pounds of solid applied (TEr is equal to TEa if a transfer efficiency is

not required).

CEa = actual control efficiency in pounds ofVOC reduced in the emission

control system per pound ofVOC emissions generated over uncontrolled

conditions.

CEr = required control efficiency in pounds of VOC reduced in the emission

control system per pound ofVOC emissions generated over uncontrolled

conditions.

Calculation Methodology applicable for Rule 1171.

MSERCs EE Q [(VOCa)(1 -CEa) _(VOCr)(1CEr)]

Where:

MSERCs = Rule 1610 VOC Mobile Source Emission Reduction Credits in pounds.

EE = excess emissions in pounds ofVOC.

Q = quantity of applied material in gallons over a specified time period

including VOC, water, exempt compounds, and solids.

VOCa = pounds of VOC per gallon of applied material including VOC, water,

exempt compounds and solids.

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VOCr = pounds ofVOC per gallon ofrequired material including VOC, water,

exempt compounds and solids.

CEa = actual control efficiency in pounds ofVOC reduced in the emission

control system per pound ofVOC emissions generated over uncontrolled

conditions.

CEr = required control efficiency in pounds ofVOC reduced in the emission

control system per pound ofVOC emissions generated over uncontrolled

conditions.

Calculation Methodology applicable for Rule 1142.

MSERCs=EE = (Q)(EF)[(1_CEa)_(1_CEr)J

Where:

MSERCs = Rule 1610 VOC Mobile Source Emission Reduction Credits in pounds.

EE = excess emissions in pounds ofVOC.

Q = flow rate of petroleum product in gallons over a specified time period.

EF = emission factor of petroleum product under uncontrolled conditions in

pounds ofVOC emissions per gallon of petroleum product corresponding

to a specific filling operation.

CEa = actual control efficiency in pounds of VOC reduced in the emission

control system per pound ofVOC emissions generated over uncontrolled

conditions.

CEr = required control efficiency in pounds ofVOC reduced in the emission

control system per pound ofVOC emissions generated over uncontrolled

conditions.

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