UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 10 

1200 Sixth Avenue, Suite 900 

Seattle, WA 98101··3140 

OFFICE OF JAN 0 7 Z AIR, WASTE AND TOXIC$ 

Mr. Anthony Barnack 

Air Monitoring Program 

Oregon Department of Enviromnenml Quality 

811 SW Sixth Avenue 

Portland, Oregon 97204-1390 

Dear Mr. Barnacle 

We have evaluated the 2011 Oregon Ambient Air Monitoring Network Plan, which describes 

changes to the OR monitoring network for 2011-12. The proposed changes, and EPA's 

responses, are listed below: 

Discontinued Monitors: 

1) Discontinued PM2.5 FRM sampling at Bend. Pump Station (41-017-0120). 

This site has been consistently below 75%, of the NAAQS. A nephelometer remains at the 

site for the woodstove advisory program. EPA approves this change. 

2) Discontinued PM2.5 FRM duplicate sampling at Hillsboro, Hare Field (41 -067-0004). 

The reductions in PIV12.5 FRIYI samplers in 201 I resulted in a lowering of the requirement 

duplicate sites from tlu·ee to two. EPA approves this change. 

3) Discontinued air toxics monitoring at Salem, State Hospital (41-047-0041). 

Site was deemed to have et1ough data. Resources were moved to support , n air taxies site 

in Klamath Falls. EPA approves this change. 

4) Discontinued the Halsey field burning meteorology site. EPA approves this change. 

5) Discontinued monitoring for vvet Mercury Deposition January 1, 2011 at Beaverton 

Highland Park ( 41-067-01 11 ). The grant's funding ended. EPA approves this change. 

6) Discontinued PM10 FRM sampling at Eugene, Lane Community College (41 -039-

001 3). This site was redundant as discussed in che five year plan. EPA approves this 

change. 

7) Discontinue CO monicors in Eugene, at the Lane Community College site ( 41-039-

0013), and in Medford. the Rogue Valley Mall site (41 -029-0018). EPA approves 

discontinuing these monitors, and the justification for discontinuing these monitors 

provided in the ODEQ report ·'Justification for Discontinuing of Monitoring in Carbon 

Monoxide and PMlO Maintenance Areas" (October 2011). 
8) Discontinue PM10 monitors in Grants Pass (41-033-0107), and Klamath Falls (41-

035-0004). EPA approves discontinuing these monitors, and the justification for 

discontinuing these monitors provided in the ODEQ report "Justification for 

Discontinuing of Monitoring in Carbon Monoxide and PM 10 Maintenance Areas" 

(October 2011). 

Other Changes: 

1) Started up a nephelometer and meteorology site at Silverton (41-047-0007) as part of 

the Willamette Valley Field Burning Netw·ork. Funding for this site was shifted from 

Halsey meteorology and Spangler Road nephelometry because of new mles 

restricting field burning to the North Willamette Valley. EPA approves this change. 

2) Started up a duplicate PM2.5 FRM at Hil1sboro. Hare Field (41-067-0004) to meet 

the 15% precision requirement. ODEQ later shut this site down because the 

reductions in PM2.5 FR1v1 samplers in 2011 resulted in a lowering of the requirement 

duphcate sites from three to two monitors. EPA approves this change. 

3) Started every third day sampling at Sweet Home ( 41-043-2002) because the estimated 

2007-2009 PM2.5 values from the nephelometer vvere within 5% of the NAAQS. 

EPA approves this change. 

4) Started NOy monitoring at Portland, SE Lafayette site ( 41-051-0080), which is the 

NCore site. EPA approves this change. 

5) Started air toxics monitoring in Klamath Falls. Peterson School (41-035-0004). State 

funded. EPA approves this change. 

6) Change sampling schedule from every sixth day to every third day at Prineville ( 41-

13-01 00) because the 2009 PM2.5 values were within 5% of the NAAQS. EPA approves 

this change. 

The following monitors are designated "core" monitors because they are either: 1) required 

by 40 CFR Part 58, Appendix D, 2) have a design value near or above the new PM2.5 24-

hour standard of 35ug/m3, or 3) they are essential monitoring parameters at NCore sites: 

I. PM2.5 FRMs (or Approved Regional Method): 

a) Portland/SE Lafayette 

b) P011land/N Roselmvn 

c) Medford (primary and co-located) 

d) Eugene (primary and co-located) 

e) La Grande NATTS site 

f) Klamath Falls 

g) Oakridge 

h) Lakeview 

i) Pendleton 

2. PM2.5 speciation monitors: 

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a) Portland/SE Lafayette 

b) Eugene/ Amazon Park 

c) :tvfedford/Grant & Belmont 

d) Klamath Fall 

3. Pre-cursor gas monitors at the Pmtland/SE Lafayette NCore site 

"Core" monitors are those monitors in the network that must be operated \Vith available 

PM2.5 monitoring flmds. The "non-core" PM2.5 monitors in the State's network can be 

operated at ODEQ's discretion with any remaining federal funds or State funds. If you have 

any questions about om approval of the Oregon monitoring net\vork, please contact Keith 

Rose at (206) 553-1 949. 

Sincerely, 

~~ 2'crL{~· State and Tribal Program Unit 

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