UNI T ED STATES E NVIRONMENTA L PR OT ECT I ON AGENC Y REGION 10 1200 Sixth Avenue, Suite 900 Seattle, WA 98101··3140

OFFICE OF 

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### Z A IR, WASTE AND T OX I C$



### Mr. Anthony Barnack Air Monitoring Program Oregon Department of Enviromnenml Quality 811 SW Sixth Avenue Portland , Oregon 97204-1390 De ar Mr. Barnacle We have evaluated the 2011 O regon Ambient A ir 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 FR M sampling at Bend. Pump Station (41-017-0120). This site has be en consis ten tly below 75%, of the NAAQS. A nephelometer remains at the s ite for the woodstove advi s ory program. E P A approves this change. 2) Discontinued PM 2 .5 FRM duplicate sampling a t Hillsboro , H are Field (41 -067-0004 )

. The reductions in PIV12.5 FRIYI s a mplers in 201 I resulted in a lowerin g of the requirement duplicate sites from tlu ·ee to two
. EPA approves this c h ange. 3) Discontinued air toxics monitoring at S a lem , State Hospital (41-047-0041). Site was deemed to have et1ough data. R e sources w e re moved to suppo rt , n air taxies site in Klamath Falls. EP A approves this change. 4) Discontinued the Halsey field burning meteorolo g y site

. EPA approves this cha n ge. 5) Discontinued monitoring for vvet Merc ury Dep os ition January 1, 2011 at Beaverton Highl and Park (41-067-01 1 1 ). The grant's funding ended

. EPA approves this change. 6) Discontinued PM10 F RM s amp li n g a t E ugene, Lan e Community C o ll e ge (41

- 039- 001 3 )

. Thi s site w as redundant as di s cu s sed in che fi ve year plan. E P A approve s this chan ge . 7 ) 

### Discontinue CO monicor s in Eugene , a t the Lane Community Colle ge site (41-039

- 0013), and in Medfo rd. the Rogue Vall ey Mall s i te (41

- 02 9-0018). EPA approves discontinuing thes e monitors , and the justification fo r di s continuin g the se monito rs provided in the OD EQ re po rt · ' Ju s tification for Di sc o nti nuin g of M o nitorin g in Car bon Monoxide and PMlO M ainte nanc e Areas" (Octob er 2 011)

.8) Discontinu e P M 10 m on itors in Grants Pass (41-033-0107), and K lamath Falls (41- 035-0004). E P A appro ves d isco ntinuing the se monitor s, and th e justification for discontinuing the se monitors pr ov ide d in the ODEQ report " Ju stificati on for Discontinuing of Monitoring in Carbon Monoxide and P M 10 Maintenance Areas" (October 2011). Other Changes: 1) Started up a nephelometer and meteorology si te at Si lverton (4 1-04 7 -000 7) as par t of the Willamette Valley Field Burning Netw·ork. Funding for thi s s ite was shifted from Halsey meteorology a nd Sp angl e r Road n ephe lometr y becau se of new mle s restricting field burning to th e North Willamette Valley. EPA approves this change. 2) Started up a duplicate PM2.5 FRM at Hil1sbo ro. Hare Field (41-067-0004) to meet the 15% pre c ision r equ irement. O D EQ l ate r 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 mon i tors. EPA approves thi s change. 3) Started every third day sampli n g at S we et Home (41-043-2002) beca use the estimated 2007-2009 PM2.5 values from the n eph e lometer v v ere within 5% of the NAAQS. EPA approves this change

. 4) Started NOy monitoring at Po rtland, SE Lafayette site (41-051-0080), which is the NCore site. EP A approves this chan ge . 5) Started air toxics monitoring in Kl ama th Falls. Peterson School (4 1-035-0004). St ate funded. EPA approve s thi s change. 6) Change samp ling schedule fro m every sixth day to every third day at Prinevil le (41- 13-01 00) be c au se the 2009 PM2.5 valu es were within 5% of the NAAQS. EPA approves thi s c h an g e. The following monitors are desi g nate d "core" monitors because they are either: 1) required by 40 CFR P art 5 8 , Ap pe ndix D, 2) have a design value near or abo ve the new PM 2.5 24- hour standard of 35ug /m3, or 3) the y are essenti a l monitoring parameters at NCore s ites: I
. PM2

. 5 FRMs (or Approved Re g ional Method): a) Portland/SE Laf ayette b) P011land/N Roselmvn c) Me dford (prima ry an d co - l ocated) d ) Eugene (prima r y and co-located) e) La Grande NATT S s ite f) Klamath Falls g) Oakridge h) Lakev iew i) Pendleton 2. PM2.5 spec iation monitors: 2 () Prf

ntea on**Rt~ cyci<M**  Papera) Portland/SE Lafayette b) Eugene/ Amazon Park c) :tvfedford/ Grant & Belmont d) Klamath Fall 3. Pre-cursor gas monitors at the Pmtland / SE Lafayette NCo re site "Core" monitors are those monitors in the network that must be operated \Vith available PM2.5 monitoring flm d s . The "non-core" PM2.5 monitors in the State's n etwo rk can be operated at ODEQ's discretion with any re mai ning f e d e ral fun ds or State funds. If you have any que s tions about om app roval of the Orego n monitoring net\vork, please contact Keith Ro se at (206) 553-1 949.

S incerely ,

# ~~**2'cr L{~·**  State and Tribal Program Unit

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# 0 P rinted on R«ycled Paper