UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
 

REGION 8
 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR DEC - 3 2009 

David A. Finley, Administrator 

Air Quality Division 

Wyoming Dept. of Environmental Quality 

122 W. 25th Street 

Cheyenne, Wyoming 82002 

Re: Wyoming Ambient Air Monitoring Annual 

Network Plan, 2009 

<2.~-ldi~( Dear Mr. T'inlcy: 

Thank you for submitting the Wyoming Ambient Air Monitoring Annual Network Plan, 

.2009 under a cover lettcr dated September 24, 2009. Region 8 has reviewed the network plan. 

This letter and its enclosurc present our comments on the plan and document our approval. 

We appreciate the effort that the Air Quality Division put into the nctvvork plan, which 

included a section and an appendix to describe the proposed multi-pollutant NCorc monitoring 

station in Wyoming. The Division named this NCore station the Cheyenne - Soccer Field site 

and gave it the AQS identification number 56-021-0100. Thc Office of Air Quality Planning and 

Standards approved the NCore station in a letter dated October 30, 2009. 

If you have any questions or comments about this letter, contact me at (303) 312-6434 or 

Joe Delwiche of my staff at (303) 312-6448. 

Enclosure 

cc: Cam Keslar 
ENCLOSliRE 

COM!\JENTS ON
 

WYOMING AMBIENT AIR MONITORING ANNUAL NETWORK PLAN, 2009
 

Thank you for modifying the tables to clarify the purposes of multiple air samplers or 

monitors at some stations. e.g.. samplers collocated for precision estimates or to accommodate 

sampling schedules. Please also consider revising the terms used in the columns showing the 

mcthods of analysis. The word ""gravimetric" can apply to gravimetric analysis using the 

reference methods for particulate sampling; however. its use in the tables can also apply to the 

TEOM method. It would be helpful to distinguish the manual methods from the continuous 

methods in this column. 

To further aid comprehension. please use current photographs of the stations wherever 

possible. The text describing the South Campbell County station (AQS identification number 

56-005-(456). for example. states that a PM 10 TEOM analyzer was installed on November 5. 

2008. but the photograph sho\\ls t\\lO high-volume PM 10 samplers on the roofofthe station. 

Thank you for including AQS identification numbers \vith the names of the air 

monitoring stations. In next year's network plan, please correct the AQS identification number 

of the air monitoring station at Jackson as it appears in appendix A from 56-039-0006 to 56-039­

1006. 

The first paragraph of section 3.1 on page 30 states that the ten State and Local Air 

Monitoring Stations (SLAMS) for PM jo in Wyoming include two types ofsamplcrs. These are 

the Thermo Partisol 2000 and the high-volume PM10 samplers. HO\vever. these add up to nine; 

the PM 10 analyzer at the Sheridan Police Department station (AQS identitication number 56-033­

00(2) is the tenth of the PM 10 SLAMS. At this time this station is not required to have another 

anal~izer collocated for precision purposes according to 48 CFR 58. Appendix A. 

Please also correct or clarify the statements about the count of special purpose monitors 

for ozone. The beginning of section 3.6 on page 34 refers to seven ozone monitoring stations 

that were operating in 2008. but the accompanying table summarizes ozone data colkcted at 

eight stations that year. As shown on page 21 of the network plan. an additional ozone analyzer 

came on line at the Pinedale City Park/Pine Creek station in 2009 (/\.QS identification number 

56-035-0 I0 I). 

Thank you for submitting a netviork modification form to document the proposed site of 

the Cheyenne NCore station (56-021-0100). We encourage the Air Quality Div'ision to use these 

forms to document conditions at future proposed sites of air monitoring stations. including land 

usc. sources or air pollution. and compliance with probe siting criteria. Region 8 has a goal of 

replying to network modification requests orally (or bye-mail) within five days and in writing 

within 30 days. 

2