NEVADA DIVISION OF 

### STATE OF NEVADA 

# ENVIRONMENTAL PROTECTION Departm ent of Conservation & Natural Resource<;

Ms. Meredith Kurpius Air Quality Analysis Office U.S. EPA Region IX 75 Hawthorne St., AIR-7 San Francisco, CA 94105 July 22, 2015

RE: Addendum to the 2015 Annual Monitoring Network Plan for the State ofNevada Dear Ms. Kurpius: Bri .111 'iiuH luv,JI , Go ve r11U r L eo M . DrolCi off, I'.E., D1rpc!O r

**O;~v1d** Em me, Ad mini stru tor

On Apri125, 2012, the Nevada Division ofEnvironmental Protection (NDEP) submitted a request to Region IX ofthe U.S. EPA for approval to discontinue the carbon monoxide (CO) monitor at Harvey's Resort and Hotel, Stateline, Nevada (AQS ID # 32-005-0009-42101-1). The NDEP ceased monitoring at the Harvey's site on June 30, 2012, although the location is being retained in the event monitoring needs to be resumed. Together with the NDEP's request, a copy ofit's second 1

0-year maintenance plan for the CO maintenance area at Lake Tahoe was enclosed providing evidence ofa continued downward trend in CO design values. The second 1 0-year maintenance plan provided for a surrogate monitoring method in the absence ofactual monitoring using annual average daily traffic (AADT) counts at the two most populated areas on the Nevada side ofthe Lake Tahoe basin: Incline Village (Washoe County) and Stateline (Douglas County). The NDEP proposed to conduct an annual review ofthe traffic volumes using the data from the Nevada Department ofTransportation's permanent automatic traffic recorders in Stateline and Incline Village. The NDEP would compare the latest rolling 3-year average ofthe AADT volumes against the baseline AADT average established by the traffic volume data collected during 2008-2010. An increase ofmore than 25 percent in the AADT count will trigger a CO monitoring study during the next CO season using the Harvey's monitor to determine the actual CO levels in the ambient air. Trigger levels would be 34,041 for the Stateline AADT and 14,916 for the Incline Village AADT. Although the U.S. EPA has not approved the discontinuance request or surrogate monitoring method, the NDEP nevertheless is enclosing AADT reviews for the periods 2010-2012, 2011-2013 and 2012-2014. The data show that traffic volumes and the rolling three-year averages have either remained level (Incline Village) or decreased (Stateline) and, thus, the trigger has not been activated. Ifyou have any questions, please contact Daren Winkelman at (775) 687-9342. 

## A

UG 03 2015 

# ~;~~g~ _____________ ......... . Phillip W. Shoopman, P.E. Chief, Bureau ofAir Quality Planning 901 S. Stewart Street, Suite 4001 • Carson City, Nevada 89701 • p: 775 .687.4670 • f: 775 .687.5856 • ndep.nv.govJuly 21, 2015 

### SURROGATE MONITORING REPORT FOR CARBON MONOXIDE AT LAKE TAHOE, NEVADA
ANNUAL AVERAGE DAILY TRAFFIC COUNTS Location 2008 2009 2010 2011 2012 2013 2014 Douglas County, station 0052110 in Stateline, NV US 50, 0.6 mi east ofthe 28,000 27,000 26,700 26,100 25,300 25,800 25,950 state line Washoe County, station 0312240 in Incline Village, NV SR 28, 0.2 mi N. of Lake 12,000 11,800 12,000 12,000 11,300 12,000 12,000 Shore Drive Source: Nevada Department ofTransportation 2014Annual Traffic Report, Douglas and Washoe Counties. http://www.nevadadot.com/uploadedFiles/NDOTI About_ NDOT INDOT_ Divisions/Planning/Traffic/20 14ATR's.pdf 

### ROLLING 3-YEAR AVERAGE FOR ANNUAL AVERAGE DAILY TRAFFIC VOLUMES

Location 2008-2010 2009-2011 2010-2012 2011-2013 2012-2014 (Baseline Year} Douglas County, station 0052110 in Stateline, NV

US 50, 0.6 mi

east ofthe 27,233 26,600 26,033 25,733 25,683 state line Washoe County, station 0312240 in Incline Village, NV

SR 28, 0.2 mi

N. of Lake 11,933 11,933 11,767 11,767 11,767 Shore Drive

Page 1 of 2July 21, 2015 

### COMPARING ROLLING 3-YEAR AADT VOLUMES AGAINST THE BASELINE
36,000 

## Rolling 3-Year Average AADT Volumes for Douglas County 34,000 - - - - - - - - - - - - - - - - - - - Trigger Level

**~**

**~** 32,000 u 

# .. i 30,000

**~** ?

**~** 28,000

**~**



### ~

**~** 26,000 <t ii ::::J 

### 2 24,000 <t



### ~ 

# 8 22,000 20,000

16,000 15,000 .!:! 14,000

**~**

**~** ?

**~** 13,000 41 bll l!

**~** <t 12,000 ii ::::J c c <t 11,000 (34,041)

2010 2011 2012 2013 2014 Rolling 3-Year Average Period 

## Rolling 3-Year Average AADT Volumes for Washoe County Trigger Level (14,916)

**.--- -....,...,....--.....,~----------**  Baseline (11,933} 11,933 11,933 11,767 11,767 11,767 10,000

**-'-'- ---**  **.L.i- ---**  **-'-~ ---**  **--~**

# _ _.___ **-~__._**

# __ **-~_** 2010 2011 2012 2013 2014 Rolling 3-Year Average Period Page 2 of 2