STATE OF TENNESSEE DEPARTMENT OF ENVIRONMENT AND CONSERVATION DIVISION OF AIR POLLUTION CONTROL 9TH FLOOR L & C ANNEX**~**

401 CHURCH STREET NASHVILLE, TN 37243-1531 

# r

# ~ Certified Mail:

October 12,2012
Ms. Gwendolyn Keys Fleming Regional Administrator U.S. EPA, Region IV Atlanta Federal Center, 121 h Floor 61 Forsyth Street, S.W. Atlanta, Georgia 30303-8960 # 7010 0780 0001 5009 4329 Return Receipt Requested

Subject: Request to Parallel Process a Supplement to the State Implementation Plan for Knox County, TN.
Dear Administrator Fleming:
The Tennessee Division of Air Pollution Control received a request from the Knox County Department of Air Quality Management to submit to EPA a request for parallel processing of a supplement to the Knox County Department of Air Quality Management portion of the Tennessee State Implementation Plan. This supplement amends the Motor Vehicle Emissions Budget (MVEB) set in the Knox County maintenance Plan Update to the 1-Hour Ozone Maintenance Plan as approved by EPA in 2004.
To expedite the review process, the Environmental Protection Agency is asked to parallel process this Supplement to the Knox County Department of Air Quality Management portion of the State Implementation Plan for Tennessee. One paper copy of the proposed revision is enclosed as well as an electronic copy on compact disc that is identical to the paper copy. A public hearing notice, which indicates the time and location of the public hearing to receive comments on this SIP revision, is enclosed.
Your prompt consideration of this request is appreciated. If you need further information or documentation please contact Marc Corrigan at (615) 532-0616.

# ~~A**~~~te~ne** , P.E. Technical Secretary Tennessee Air Pollution Control Board
Enclosures

cc: Mr. R. Scott Davis, Branch Chief US EPA Ms. Lynorae Benjamin, US EPA Ms. Lynne A. Liddington, Knoxville, TN Mr. Malcolm H. Butler, DAPC, Nashville, TN Mr. Marc Corrigan, DAPC, Nashville, TN

### OFFICE OF COUNTY MAYOR Air 

### Quality Management 140 

### Dameron Avenue, 

### Knoxville, TN 37917



### September 18, 2012

Mr. 

### Barry Stephens, 

### P.E. Director, Division of

### Air Pollution Control 401 Church Street Nashville, TN 37243-1531

Dear 

### Mr. Stephens: 

### I have attached a proposed 

### revision to the 

### Knox County portion ofthe 

### Tennessee State hnplementation Plan (SJP) for the one-hour ozone standard. This revision changes the Motor Vehicle Emissions Budget 

### set in 

### the 

### Knox County Maintenance Plan Update 

### as approved in 

### 2004. This SJP revision is 

### currently in

### public review.
In order to expedite adoption ofthe revised Motor Vehicle Emissions Budget, 

### I requestthat 

### you send a letter to EPA requestingparallel procession ofthis SJP revision. Ifyou have any 

### questions or comments regarding this matter, please feel free 

### to me at 

### (865)215-5900.

Enclosure

phone 865.215.5900 • fax 865.215.5902 • aqm@aqm.co.knox.tn.us

# Supplement to the
Maintenance Plan Update
For
Knox County, Tennessee

July 27,2012



### Prepared by:
Knox County 

### .Department ofAir Quality 

### Management 

## 140 Dameron Avenue Knoxville, TN 37917

### INTRODUCflON


### On October

### 27, 1993, the U.S. Environmental Protection Agency (EPA)redesignated Knox County 

### from nonattainment to 

### attainment for the 1-hour ozone National Ambient 

### Air Quality Standard, through 

### rulemaldng in the Federal Register. Additionally, as part ofthat 

### rulemaking, EPA approved the 

### initial 1-hour ozone 

### maintenance plan for 

### Knox County into 

### the Tennessee 

### State Implementation Plan 

### (SIP) (58 

### FR 50271). Knox County submitted a subsequent revision to the Tennessee SlP 

### on January 18, 1995. The purpose of this 

### SIP revision request was 

### to revise 

### the projectedinventory to provide amore 

### accurate and

### practical motor vehicle emission budgets (MVEB) for 

### the transportation planning community. EPA 

### approved this revision to the Tennessee SIP on October 6, 1997 (62 FR 42068). This 

### projected emissions inventory became the Knox County emissions budget upon approval. Knox County updated the projected emissions inventory and 

### submitted an 

### update to 

### the Maintenance Plan on July 16, 2003. 

### EPA approved this plan 

### was approved on February 

### 2, 2004 (69 FR 4852). Subsequently, 

### EPA has developed 

### new mobile emissions 

### estimation 

### programs. The emissions estimates using this new software are higher than 

### previous methods. This Supplement to 

### the Maintenance Plan Update 

### revises the

### MVEB by

### allocating the emissions safety margin for 

## NOx to 

### the mobile source sector. This revision to

### the Knox County

### portion ofthe Tennessee SlP 

### is being 

### submitted to

. 

### satisfy Section 175A(b) ofthe 

### Clean 

### Air Act as amended in 1990.

REVISED PAGES 

### Attached aretherevised

### pages tothe

### Maintenance Plan Update for Knox County, TN. To appropriately revise the original 

### document, replace the following numbered pages.

1SECTION 3.0 SUMMARY



### 3.1 PROJECTED EMISSIONS INVENTORY 

### AND BUDGET
The projected emissions inventory for

### the Knox CountyMaintenance area for 2004, 2010, and2014 is presented in Table 3-1. The on-road mobile emissions for all 

### years have beenrevisedtoincorporate theresults from Mobile 6.2. The emissions inventories from 1997 have beenrevisedwithMobile 6.2 emission factors for on-roadmobile sources andare 

### also 

### presented for comparison.


### 3.2 MOTOR 

### VEmCLE EMISSIONS BUDGET
Pursuant to the EPA transportation conformity rule at 40 CFR Part 93, specific emission

### budgets are 

### hereby defined for the on-roadmobile sources portion of theemissions inventory. These budgets 

### are to be 

### used by the transportation authorities to assure that transportation plans, programs, and projects 

### are consistent with, and confonn to, the 

### maintenance ofacceptable 

### airquality intheKnox 

### Countymaintenance 

### area. The lastyear of thismaintenanceplan 

### is 2014. SpecificMotorVehicle Emissions Budgets (MVEB) for2004 and 2014 

### are set for VOC and NOx 

### as follow:
2004 2014 VOC, TPD 29.24 22.12 NOx.TPD 33.89 31.71
The above 

### MVEB reflect the total on-road emissions for the 

### MVEB 

### years 2004 and 2014, plus an allocation 

### from the available VOC andNOx safetymargins. 

### Specifically, 7.97 TPD ofthe available VOC safety margin 

### is allocated 

### to the 2004 MVEB and 11.61 TPD for the 2014MVEB. Additionally, 2. 79 TPD ofthe available NOx safety margin are allocated tothe 2004MVEB and 18.43 TPD forthe 2014 MVEB. Theremaining safetymargin for VOC for 2004 

### is 7.97 TPD andfor 2014 is 11.61 TPD. There is no safetymargin remaining for NOx for2004 or 2014. The MVEB are consistent with the plan for maintaining total emissions :from all somcecategories 

### atorbelow the 1990VOC andNOx, emissions levelsthroughtheyear2014 

### [6]. Forfuture conformity determinations, transportation authorities shouldrelyontheabove 

### MVEB unless this maintenance plan is revised.

3.3 CONCLUSION The 

### total VOC, NOx ,and CO emissions projected for 2004, 2010, 

### and. 2014

### f~r~e Knox County

### Maintenance Area are belowthe 1990

### attainmentlevel emissions mventones m the Knox County Maintenance Plan.
10

### The emissions projections demonstrate that no additional measures are needed to assure 

### continued attainment of the NAAQS for the 1- hour ozone 

### standard [ 6). 

### Additionally, the 

### MVEB for 

### 2004 

### and 2014, 

### are consistentwith 

### maintenance and have been discussed with the 

### interagency consultation workgroup for Knoxville. Upon approval ofthis SIP revision 

### request, the revisedMVEBs will replace 

### the 2004 MVEBs 

### and will

### establish 2014 MVEBs to 

### be 

### used for demonstrating transportation confonnity for Knox County.

Table 3-1. Knox County Emission Budget TonsPerOax: safety Year Area Non-Road Biogenic Mobile Point Total Margin
Volatile Organic Compgunds 1990 28.82 9.81 32.43 40.84 8.06 119.96 1993 29..25 9.96 32.43 32.35 8.64 112.63 2004 30.90 10.52 32.43 21..27 8.90 104.02 15.94 2010 31.84 10.84 32.43 13.93 9.76 98.80 2014 32.48 11.06 32.43 10.51 10.26 96.74 23.22
N!UP9en Oxides 1990 3.66 9.77 0.00 37.62 8.96 80.01 1993 3.72 9.92 0.00 34.85 9.54 58.03 2004 3.92 10.48 0.00 31.10 11.73 57.23 2.79 2010 4.04 10.79 0.00 19.99 12.53 47.35 2014 4.13 11.01 0.00 13.27 13.17 41.58 18.43
Carbon Monoxide 1990 7.54 68.89 0.00 495.02 3.00 574.45 1993 7.65 69.93 0.00 378.59 2.80 458.97 2004 8.08 73.87 0.00 245.77 3.39 331.11 2010 8.33 76.12 0.00 185.95 3.63 274.03 2014 8.50 77.65 0.00 165.60 3.81 255.56

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