UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 10 1200 Sixth Avenue, Suite 900 Seattle, WA 98101-3140

OFFICE OF AIR, WASTE AND TOXICS

October 14,2010

Mr. Anthony Barnack Air Monitoring Program Oregon Department ofEnvironmental Quality 811 SW Sixth Avenue Portland, OR97204-1390

DearMr. Barnack:

Wehave evaluatedthe 2010 Oregon Ambient Air Monitoring NetworkPlan, which describes changes to the OR monitoring network for 2010-11. ODEQproposes the following changes to the OR air monitoring network: PM10 monitors 1) Discontinue the Grants Pass (41-033-0114) PM10FRM. This site has not had an annual second high value above 33% ofthe NAAQS in the last 10 years. Ifthis monitoris the only remaining PM10 monitorin the Grants Pass PM10 maintenance area, it cannotbe discontinued unless ODEQproposes, and EPAagrees, to a revision to the State implementation plan (SIP) that identifies a surrogate method ofdetermining compliance with the standard. 2) Discontinue the Pendleton PM10 FRM (41-059-0121). This site has not had an annual secondhigh value above 37% ofthe NAAQS in the last 10 years. EPA approves this change. 3) Discontinue the MedfordWelch and Jackson PM10 FRM (41-029-2129). This site has not had an annual second high value above 62% ofthe NAAQS in the last 10 years. This monitor is

one ofthree in the Medford PM10 AQMA. The White CityPM10 sampler (41-029-4001) will remain operatingindefinitely, and the Medford Grant and Belmont PM10 sampler (41-029-0133) will operate as long as air toxies are collected in Medford. EPA approves this change. 4) Discontinue the Klamath Falls PM10 FRM (41-035-0004). This site has nothad a second high value above 62% ofthe NAAQS in the last 10 years. Ifthis monitoris the onlyremaining PM10 monitorin the Klamath Falls PM10 maintenance area, it cannotbe discontinued unless ODEQproposes, and EPA agrees, to a revision to the State implementation plan (SIP) that identifies a surrogate method ofdetermining compliance with the standard. PM2.5 monitors 5) Discontinue the La Grande (41-061-0119) PM2.5 FRM. Thethree year average 98th percentile for this site is 18uglm3. La Grande will continue to collect light scattering (continuous PM2.5) data. EPA approves this change. 6) Discontinue the Medford Dodge Road (41-029-1001) PM2.5 FRMBackground site. EPA approves this change. 7) Discontinue the Portland N. Roselawn (41-051-0246) PM2.5 FRM. The PNR three year average 98thpercentile is 20ug/m3. Funding will be shifted to fund an FRMin Sweet Home which was defundedbythe Oregon Dept ofAgriculture. The Portland site will continue to collect light scattering (continuous PM2.5) data. EPA approves these changes.8) Start a PM2.5 FRM at Sweet Home (41-43-2002) on a 1/6 schedule. FRM sampling will starthere because the site had an estimatedthree year average 98th percentile of 32uglm3, based on light scattering. EPA approves this change. 9) Hillsboro (41-067-0004) PM2.5 FRM will change its schedule from 1/6to 1/3because its current 98thpercentile is within 5 to 10% ofthe NAAQS. EPA approves this change. 10) ODEQ will start up a light scattering (continuous PM2.5 estimate) and meteorology site in Silverton, Oregon which will be funded during the summermonths bythe Oregon Department ofAgriculture and during the winterby DEQ. The site will monitor field burning in the areajustnorthwest ofSalem startingJuly, 2010. This is not EPA funded, no approval needed. 11) ODEQ may discontinue light scattering (continuous PM2.5) monitoring at the Klamath Falls Background site to transfer funding to other monitoring work. EPA approves this change. CO monitors 12) ODEQproposes to discontinue the Portland, SW 3rdCO site (41-051-0087). This site is 21% ofthe NAAQS. There is a trace CO monitor at the PortlandNCore site, which is within the Portland CO maintenance area. EPA approves this change. 13) Discontinue the Medford Rogue Valley Mall CO site (41-039-0018). This site is 25% ofthe NAAQS. Ifthis monitor is the onlyremaining CO monitor in the Medford CO maintenance area, it cannotbe discontinued unless ODEQ proposes, and EPA agrees, to a revision to the State implementationplan (SIP) that identifies a surrogate method of determining compliance with the standard. Lead monitors 14) ODEQ will delay PMlO-Pb monitoring at the PortlandNCore site until 12 months afterEPA finalizes the revised Pb Rule, which is projectedto be December 2011. NOy monitors 15) ODEQ will start operating an NOy monitor at Portland SE Lafayette (41-051-0080) byJanuary 1, 2011, as required byEPA. EPA approves this change. AirToxies monitors 16) ODEQwill move the Salem air toxics site onJuly 1st to Hillsboro, N. Portland, Gresham, Albany, McMinnville, or St. Helens depending on the outcome ofthe 2005 NATA results, yet to be reviewedby ODEQ. EPA approves this change. PMc monitor 17) ODEQ will begin reporting PMc data from the PortlandNCore site to AQS by January 1, 2011. EPA approves this change.

The following monitors are designated "core" monitors because they are either: 1) required by40CFR Part 58, Appendix D, 2) have a design value near or above the new PM2.5 24-hour standard of35ug/m3, or 3) they are essential monitoringparameters at NCore sites:

1. PM2.5 FRMs (or Approved Regional Method): a) PortlandiSELafayette b) PortlandIN Roselawn c) Medford (primary and co-located) d) Eugene (primary and co-located)

2

### e) La Grande NATTS site f) 

### Klamath Falls g) Oakridge h) Lakeview i) Pendleton 2. PM2.5 speciation monitors: a) PortlandlSE Lafayette b ) Eugene/Amazon Park c) MedfordlGrant & 

### Belmont d) Klamath Fall 3. Pre-cursor gas monitors at the PortlandlSE Lafayette NCore site

"Core" monitors are those monitors in the network that must be operated with available PM2.5 monitoring funds. The "non-core" PM2.5 monitors in the State's network

can be operated at ODEQ'sdiscretion with any remaining federal funds or State funds. If you have any questions about ourapproval ofthe Oregon monitoring network, please contact Keith Rose at (206) 553-1949.

Sincerely,

# De~tin71~ State and Tribal Program Unit

cc: Paul Kaprowski, 000 

### Keith Rose, OAWT Chris Hall, OEA JeffSmith, ODEQ



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