NEVADA DIVISION OF STATE OF NEVADA 

ENVIRONMENTAL 

PROTECTION 

Department of Conservation & Natural Re source<; 

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 of Nevada 

Dear Ms. Kurpius: 

Bri.111 'iiuHluv,JI , Go v e r11U r 

Leo M . DrolCi off, I'.E., D1rpc!Or 

O;~v1d Em me, Admini stru tor 

On Apri125, 2012, the Nevada Division of Environmental 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 of it's second 

1 0-year maintenance plan for the CO maintenance area at Lake Tahoe was enclosed providing 

evidence of a continued downward trend in CO design values. 

The second 1 0-year maintenance plan provided for a surrogate monitoring method in the 

absence of actual monitoring using annual average daily traffic (AADT) counts at the two most 

populated areas on the Nevada side of the Lake Tahoe basin: Incline Village (Washoe County) and 

Stateline (Douglas County). The NDEP proposed to conduct an annual review of the traffic volumes 

using the data from the Nevada Department of Transportation's permanent automatic traffic recorders 

in Stateline and Incline Village. The NDEP would compare the latest rolling 3-year average of the 

AADT volumes against the baseline AADT average established by the traffic volume data collected 

during 2008-201 0. 

An increase of more 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. 

If you have any questions, please contact Daren Winkelman at (775) 687-9342. 

_____________ AUG 0 3 2015 ......... . 

~;~~g~ Phillip W. Shoopman, P.E. 

Chief, Bureau of Air Quality Planning 

901 S. Stewart Street, Suite 4001 • Carson City, Nevada 89701 • p: 775.687.4670 • f: 775.687.5856 • ndep.nv.gov 

July 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 of the 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 of Transportation 2014 Annual Traffic Report, Douglas and Washoe Counties. 

http ://www.nevadadot.com/uploadedFiles/NDOT I About_ NDOT IN DOT_ 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 of the 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 2 
July 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