UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 10 

Mr. Mike Ragan 

Air Monitoring Coordinator 

Air Quality Program 

W A Department of Ecology 

P.O. Box 47600 

Olympia, Washington 98504-7600 

Dear Mr. Ragan: 

1200 Sixth Avenue, Suite 900 

Seattle, WA 98101-3140 

OCT 2 5 2012 

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 proposed changes 

to the network in this plan: 

I. Ecology proposes to locate its first N02 near roadway monitor at a location near I 0111 and 

Weller streets in Seattle, and to begin operation of this monitor in 2013. Ecology proposes 

locating a second N02 near roadway monitor in Tacoma (at an unspecified site) and will 

begin operation of this monitor in either 2014 or 2015, as funding permits. EPA approves the 

siting and operation of the 10111 and Weller N02 monitor. Ecology will have to identify the 

specifics of the proposed Tacoma near roadway site in a future annual network plan, or in a 

separate N02 ncar roadway monitoring plan, prior to EPA approval of that site. 

2. The PM2.5 monitor at the Meadowdale Blackbird Drive site (530351 005) has been relocated 

to a new site, the Bremerton Spruce St. site (530350007), to meet EPA siting criteria. EPA 

approves the relocation of this monitor. 

3. The co-located FRM monitor at the Spokane Augusta site (530630021) has been relocated to 

the Tacoma L St. site (530530029) at the request of EPA 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 

(530611 007) at the request of EPA 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 by 40 

CFR Part 58, Appendix D, 2) have a design value near or 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 

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g) 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 monitor at Beacon Hill and the proposed N02 near roadway monitor at 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, prior to EPA approval of those sites. If you have any 

questions about our approval of the Washington monitoring network, please contact Keith Rose at 

(206) 553-1949. 

cc: Chris Hall, OEA 

Keith Rose, OA WT 

Jeff Hunt, OA WT 

Claudia Vaupel, OAWT 

Sincerely, 

fdcWA n~~ Debra M. Suzuki, Manager 

State and Tribal Program Unit 

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