## 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 ofapplied material in pounds per gallon including VOC, water,

exempt compounds, and 

### solids. dr = 

### density ofrequired material in pounds pergallon including VOC, water,

exempt compounds, and 

### solids. 

### Q = 

### quantity ofapplied material in gallons overa specified time period

including VOC, water, exempt compounds, and 

### solids. Sa = 

### solvent fraction ofapplied material in pounds ofliquid (VOC, water, and



### exempt compounds) perpound ofapplied material. Sr = 

### solvent fraction ofrequired material in pounds ofliquid (VOC, water, and



### exempt compounds) perpound ofapplied material.

A-iVOCa = pounds ofVOC per gallon ofapplied 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 ofapplied coating in pounds ofsolid attached per

pounds ofsolid applied. TEr required transfer efficiency ofapplied coating in pounds ofsolid attached

per pounds ofsolid applied (TEr is equal to TEa ifa 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 ofVOC 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 ofapplied material in gallons over a specified time period

including VOC, water, exempt compounds, and solids. VOCa = pounds ofVOC per gallon ofapplied material including VOC, water,

exempt compounds and solids.

A-2VOCr = 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 ofpetroleum product in gallons over a specified time period. EF = emission factor ofpetroleum product under uncontrolled conditions in

pounds ofVOC emissions per gallon ofpetroleum product corresponding to a specific filling operation. 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.

A-3