UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 10

Mr. Mike Ragan Air Monitoring Coordinator Air Quality Program W A Department ofEcology P.O. Box 47600 Olympia, Washington 98504-7600

Dear Mr. Ragan: 1200 Sixth Avenue, Suite 900 Seattle, WA 98101-3140



### OCT 

## 252012 OFFICE OF AIR, WASTE AND TOXICS

We have evaluated the 2012 Washington Ambient Air Monitoring Network Plan, which describes the Washington monitoring network for 2012-2013. EPA has the following comments on proposedchanges
to the network in this plan:

I. Ecology proposes to locate its first N02 near roadway monitor at a location near I0111 and Weller streets in Seattle, and to begin operation ofthis monitor in 2013. Ecology proposes locating a second N02 near roadway monitorin Tacoma (at an unspecified site) and will begin operation ofthis monitor in either2014 or 2015, as funding permits. EPA approves the siting and operation ofthe 10111 andWellerN02 monitor. Ecology will have to identify the specifics ofthe proposed Tacomanearroadway site in a future annual network plan, or in a separate N02 ncar roadway monitoring plan, prior to EPA approval ofthat site. 2. The PM2.5 monitorat the Meadowdale Blackbird Drive site (530351005) has been relocated
to a new site, the Bremerton Spruce St. site (530350007), to meet EPA siting criteria. EPA approves the relocation ofthis monitor. 3. Theco-located FRM monitor at the Spokane Augusta site (530630021) has been relocated to the Tacoma L St. site (530530029) at the request ofEPA to meet network quality assurance requirements. EPA approves this change. 4. The co-located FEM at the Tacoma L St. site has been relocated to the Marysville site (530611007) at the request ofEPA to meet EPA monitoring network quality assurance requirements. EPA approves this change.

The following monitors are designated "core'' monitors because they are either: I) required by40 CFR Part 58, Appendix D, 2) have a design value nearor above the new PM2.5 24-hour standard of 35 ug/m3, or 3) they arc NCore pre-cursor gas monitors:

1. PM2.5 FRMs (or Approved Regional Method): a) Beacon Hill b) Duwamish (primary and co-located) c) Crown Zellerbach (primary and co-located) d) Tacoma/L Street e) Darrington t) Marysville



# 0 PrintedonRecycledPaperg) Yakima h) Vancouver 2. PM2.5 speciation monitors: a) Seattle, Beacon Hill b) Tacoma, L Street c) Spokane, Ferry Street d) Vancouvcr,4111 and Plain Boulevard c) Yakima, South 4th Avenue 3. Pre-cursor gas monitors a) Beacon Hill NCore site b) Checka Peak NCore site

With this Jetter, EPA is approving the Washington Annual Monitoring Network Plan, including the area-wide N02 monitorat Beacon Hill and the proposed N02 nearroadway monitorat the 10111 and Weller site in Seattle. EPA is not approving any additional N02 ncar roadway monitors at this time. Future N02 ncar roadway sites must be identified in future annual monitoring network plans, or separate N02 near roadway monitoring plans, priorto EPA approval ofthose sites. Ifyou have any questions about our approval ofthe Washington monitoring network, please contact Keith Rose at (206) 553-1949.

cc: Chris Hall, OEA Keith Rose, OAWT JeffHunt, OAWT Claudia Vaupel, OAWT Sincerely, 

# fdcWA**n~~** Debra M. Suzuki, Manager State and Tribal Program Unit



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