UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

REGION 10

1200 Sixth Avenue, Suite 900

Seattle, WA 98101-3140

OFFICE OF

AUG 232013

AIR, WASTE AND TOXICS

Stu Clark, Air Quality Program Manager

Washington. State Department of Ecology

PO Box 47600

Olympia, WA 98504-7600

Re: Review of Draft Chapter 173-476 Washington Administrative Code (WAC) Ambient Air

Quality Standards

Dear Mr. Clark:

We have reviewed the draft version of "Chapter 173-476 WAC Ambient Air Quality Standards"

to identify potential deficiencies prior to final submission of the regulation for EPA approval.

When compared to the current Environmental Protection Agency (EPA) National Ambient Air

Quality Standards, we have concluded that the draft version sent to the EPA on July 3, 2013,

would likely be approvable into the Washington State Implementation Plan pending one minor

change discussed on page 10 of the attached supporting memorandum. As discussed with your

staff, the EPA intends to formally comment on this issue during the state public comment period.

The EPA will make a final decision based on our review of the complete State Implementation

Plan revision submitted following your public process and after consideration of any comments

received by you. If you have any questions please feel free to contact me at 206-553-1271 or

have your staff contact either Debra Suzuki, Air Programs Unit Manager, at 206-553-0985 or

Jeff Hunt, staff lead, at 206-553-0256.

Ka e I lly, ► tor

Office of aste, and Toxics

J^^^asrgr

Fs-r UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

REGION 10

.D3 tt 1200 Sixth Avenue, Suite 900 o Seattle, WA 98101-3140

PRo-O

August 16, 2013

MEMORANDUM

SUBJECT: Review of Draft Chapter 173-476 WAC Ambient Air Quality Standards

FROM: Jeff Hunt, Air Quality PlannerTO: Debra Suzuki, Air Programs Unit Manager

The Washington Department of Ecology (Ecology) asked the EPA to review a draft version of

Chapter 173-476 Washington Administrative Code (WAC) Ambient Air Quality Standards, so

that any errors or EPA concerns can be addressed prior to final submission for approval into the

State Implementation Plan (SIP). Attachment A is a copy of the draft rule language annotated

with my analysis of the provisions. Attachment B is my analysis of the supporting SIP revision

documentation. Once Ecology makes the minor correction identified on page 10 of Attachment

A, I believe this draft version of Chapter 173-476 WAC meets the Clean Air Act requirements

for incorporation into the SIP barring any significant public comments or changes in EPA policy.

Creation of a sample proposed Federal Register notice

In order to identify all relevant issues to the best of my ability, I drafted a sample Federal

Register notice based on the Approval and Promulgation of Implementation Plans; Georgia;

State Implementation Plan Miscellaneous Revisions recently published by the EPA on May 16,

2013. This Federal Register updates the Georgia SIP to reflect the EPA's current National

Ambient Air Quality Standards (NAAQS) for sulfur dioxide, nitrogen dioxide, ozone, lead, and

particulate matter similar to Ecology's draft rule language. This sample Federal Register notice

is included as Attachment C. Upon submission of a final SIP revision, I will review any changes

to Ecology's final rule language along with any comments received during the state public

comment period and revise this draft as appropriate.

OFFICE Or

AIR, WASTE AND'1 °OXIC:S
Attachment A - the EPA's Analysis of Draft Chapter 173-476 Washington Administrative

Code (WAC) Ambient Air Quality Standards

Chapter. 173-476 WAC

AMBIENT AIR QUALITY STANDARDS

NEW SECTION

WAC 173-476-010 Purpose. This chapter establishes maximum

acceptable levels in the ambient air for particulate matter,

lead, sulfur dioxide, nitrogen oxides, ozone, and carbon

monoxide..

EPA analysis - this introductory text is worded differently than 40 CFR 50.2, but the

general framework is consistent with the EPA text.

NEW SECTION

WAC 173-476-020 Applicability. (1) The provisions of this

chapter apply to all areas of the state of Washington.

(2) All federal,regulations referenced in this regulation

are adopted as they exist on August 3, 2013.

EPA analysis - the EPA supports statewide applicability of the NAAQS. This

should lessen the burden on local agencies when future EPA NAAQS are updated.

2
NEW SECTION

WAC 173-476-030 Definitions. (1) Unless a different meaning

is clearly required by context, words and phrases in this

chapter have meanings consistent with general terms defined in

chapter 173-400 WAC.

(2) Definitions specific to this chapter:

(a) "Period" means any interval of the specified time.

(b) "ppmv" means parts per million by volume.

EPA analysis - EPA typically uses the term "ppm" in our NAAQS, however

Ecology's additional clarification of "ppmv" is consistent with our methodology.

(c) "ppb" means parts per billion by volume, which is 1

part in 1,000,000,000 parts by volume.

(d) "Federal Reference Method" or "FRM" means an EPA

designated ambient air quality sampling and analysis method

specified in an appendix to 40 C.F.R. Part 50, or a method that

has been designated as a reference method according to 40 G.F.R.

Part 53. It does not include a method for which a reference

3
method designation has been canceled according to 40 C.F.R.

53.11 or 53.16.

(e) "Federal Equivalent Method" or "FEN" means an EPA

designated ambient air quality sampling and analysis method that

has been designated as an equivalent method according to 40

C.F.R. Part 53. It does not include a method for which an

equivalent method designation has been canceled according to 40

C.F.R. 53.11 or 53.16.

EPA analysis - These definitions are consistent with the EPA definitions

located iii 40 CFR 50.1

NEW SECTION

WAC 173-476-100 Ambient air quality standard for

particulate matter, PM-10. (1) Standard for PM-10. The twentyfour-hour average concentration of PM-.10 in the ambient air must

not exceed 150 micrograms per cubic meter (pg/m 3 ) more than one

time per year, on a three-year average.

(2) Measurement method. The levels of PM-10 in the ambient

air must be measured by:
(a) A FRM based on 40 C.F.R. Part 50, Appendix J and

designated according to 40 C.F.R. Part 53; or

(b) A FEM designated according to 40 C.F.R. Part 53.

(3) Interpretation method. The interpretation method found

in 40 C.F.R. Part 50, Appendix K must be used.

EPA analysis - this section is consistent with the EPA PM 10 NAAQS provisions

contained in 40 CPR 50.6 and Appendix K. Note that the EPA primary standard and

the secondary standard for PM 1D are both 150 μg/m3 . Throughout this draft rulemaking

Ecology does not differentiate between primary and secondary standards, but instead

incorporates all of them. This Ecology approach seems to be more straightforward and

understandable compared to the EPA regulations,

NEW SECTION

WAC 173-476-110 Ambient air quality standards for

particulate matter, PM-2.5. (1) Standards for PM-2.5.

(a) The three-year average of the annual arithmetic mean

concentration of PM-2.5 must not exceed 12.0 micrograms per

cubic meter (pg/m3 ).

(b) The three-year average of the ninety-eighth percentile

twenty-four-hour average concentration of PM-2.5 must not exceed

35 pg/m3 .
(2) Measurement method. The levels of PM-2.5 in the ambient

air must be measured by:

(a) A FRM based on 40 C.F.R. Part 50, Appendix L and

designated according to 40 C.F.R.. Part 53; or

(b) A FEM designated according to 40. C.F.R. Part 53.

(3) Interpretation method. The interpretation method found

in 40 C.F.R. Part 50, Appendix N must be used.

EPA analysis - this section is consistent with the EPA PM2 . 5 NAAQS provisions

contained in 40 CFR 50.18 and Appendix N.

NEW SECTION

WAC 173-476-120 Ambient. air quality standard for lead (Pb).

(1) Standard for lead. The three-month rolling average

concentration of lead (Pb) and its compounds in the ambient air

must not exceed 0.15 micrograms per cubic meter (pg/m3 ).

(2) Measurement method. The levels of Pb in the ambient air

must be measured by:

(a) A FRM based on 40 C.F.R. Part 50, Appendix G and

designated according to 40 C.F.R. Part 53; or

6
(b) A FEM designated according to 40 C.F.R. Part 53.

(3) Interpretation method. The interpretation method found

in 40 C.F.R. Part 50, Appendix R must be used.

EPA analysis - this section is consistent with the EPA lead (Pb) NAAQS provisions

contained in 40 CFR 50.16 and Appendix R.

NEW SECTION

WAC 173-476-130 Ambient air quality standards for sulfur

oxides (sulfur dioxide). (1) Standard for sulfur oxides

(measured as sulfur dioxide).

(a) Annual. The annual average concentration for sulfur

oxides in the ambient air must not exceed 0.02 ppmv in a

calendar year.

EPA analysis - this state standard of 0.02 ppm is more stringent than the federal

annual standard of 0.030 ppm contained in 40 CFR 50.4. Under the provisions of

40 CFR 50.2(d) states may establish more stringent NAAQS.

(b) Twenty-four-hour. The twenty-four-hour average

concentration for sulfur oxides in the ambient air must not

exceed 0.1 ppmv more than once per calendar year. The twentyfour-hour averages must be determined from successive

7
nonoverlapping twenty-four-hour blocks starting at midnight each

calendar day.

EPA analysis - this state standard of 0.1 ppm is lower than the federal 24-hour

standard of 0,14 ppm contained in 40 CFR 50.4. However, under certain rounding

situations, discussed below, the state standard can be less stringent than the federal

standard. Ecology has agreed to revise their rounding convention for the 24-hour

standard, so this standard will likely be changed to 0.10 ppm. Alternatively, the

state could adopt the federal standard of 0.14 ppm if desired.

(c) Three-hour. The three-hour average concentration for

sulfur oxides in the ambient air must not exceed 0.5 ppmv more

than once per calendar year. The three-hour averages must be

determined from successive nonoverlapping three-hour blocks

starting at midnight each calendar day.

EPA analysis - this section is consistent with the EPA's 3-hour sulfur oxides NAAQS

provisions contained in 40 CFR 50.5.

(d) One-hour. The three-year average of the annual ninetyninth percentile of the daily maximum one-hour average

concentrations for sulfur oxides in the ambient air must not

exceed 75 ppb.

EPA analysis - this section is consistent with the EPA's 1-hour sulfur oxides NAAQS

provisions contained in 40 CFR 50.17 and Appendix T,

8
(2) Measurement method. The levels of sulfur oxides must be

measured as sulfur dioxide by:

(a) A FRM based on 40 C.F.R. Part 50, Appendix A or A-I; or

(b) A FEM designated according to 40 C.F.R. Part 53.

(3) Interpretation methods.

(a) The annual arithmetic mean is based on the average of

hourly data. To be used in calculating the annual average, the

hourly data must be at least seventy-five percent complete in

each calendar quarter of the year.

(b) The interpretation method for the twenty-four-hour

average found in 40 C.F.R. Part 50.4(d) must be followed.

(c) The interpretation method for the three-hour average

found in 40 C.F.R. Part 50.5(c) must be followed.

(d) The interpretation method for the one-hour average

found in 40 C.F.R. Part 50, Appendix T must be followed.

(4) Rounding of values.

9
(a) The annual arithmetic mean must be rounded to three

decimal places (fractional parts equal to or greater than 0.005

ppmv must be rounded up).

EPA analysis - this state draft rule language uses one less significant digit

in their rounding convention for the annual standard.than the EPA

rounding convention found in 40 CFR 50.4(a). However, the state

standard of 0.02 ppm is more stringent than the federal standard of 0.030

in all situations, so the difference in rounding conventions is fine from an

EPA SIP approval standpoint.

(b) The twenty-four-hour averages must be rounded to two

decimal places (fractional parts equal to or greater than 0.05

ppmv must be rounded up).

EPA analysis - with respect to the 24-hour standard, the difference in state

and EPA rounding conventions would cause a problem from an EPA SIP

approval standpoint. Because the state standard has one less significant

digit, measured values in the 0.145 to 0.149 ppm range would be

considered a violation of the federal standard but not the state standard;

making the state standard less stringent in some situations. [See 40 CFR

50.2(d) for the EPA rounding convention]. As discussed with Ecology

staff, the EPA intends to make this comment during the state public

comment period.

(c) The three-hour standard averages must be rounded to one

decimal place (fractional parts equal to or greater than 0.05

ppmv must be rounded up).

EPA analysis -- this text matches the text of of 40 CFR 50,5(a) which

states, "[the level of the 3-hour standard] shall be rounded to 1 decimal

place (fractional parts equal to or greater than 0.05 ppm shall be rounded

up)."

10
(5) Sunset provision. The ambient standards in WAC 173-476-

130 (1) (a) and (b) are no longer applicable in a specific area

one year after the effective date of the EPA's designation of.

attainment status of that area for the standard in WAC 173-476-

130 (1)(d) and 40 C.F.R. 50.17.

EPA analysis - these sunset provisions are consistent with the sunset provisions

contained 40 CFR 50.4(e).

NEW SECTION

WAC 173-476-140 Ambient air quality standards for nitrogen

oxides (nitrogen dioxide). (1) Standards for nitrogen oxides

(measured as nitrogen dioxide).

(a) The annual average concentration for nitrogen oxides in

ambient air must not exceed 53 ppb (100 pg/m3) measured in the

ambient air as nitrogen dioxide.

(b) The three-year average of the ninety-eighth percentile

of the daily maximum one-hour average concentration of nitrogen

oxides must not exceed 100 ppb, as measured in the ambient air

as nitrogen dioxide.

11
(2) Measurement method. The levels of nitrogen oxides must

be measured as nitrogen dioxide by:

(a) A FRM based on 40 C.F.R. Part 50, Appendix F; or

(b) A FEM designated according to 40 C.F.R. Part 53.

(3) Interpretation method. The interpretation method found

in 40 C.F.R. Part 50, Appendix S must be followed.

EPA analysis - these provisions are consistent with the EPA's nitrogen oxides standard

contained in 40 CFR 50.11

NEW SECTION

WAC 173-476-150 Ambient air quality standard for ozone. (1)

Standard for ozone. The three-year average o-f the annual fourth

highest daily maximum eight-hour average concentration of ozone

in the ambient air must not exceed 0.075 ppmv.

(2) Measurement method. The levels of ozone in the ambient

air must be measured by:

(a) A FRM based on 40 C.F.R. Part 50, Appendix D and

designated according to 40 C.F.R. Part 53; or

(b) A FEM designated according to 40 C.F.R. Part 53.

12
3) Interpretation method. The interpretation method found

in 40 C.F.R. Part 50, Appendix P must be followed.

EPA analysis -- these provisions are consistent with the EPA's ozone standard

contained in 40 CFR 50.15

NEW SECTION

WAC 173-476-160 Ambient air quality standards for carbon

monoxide. (1) Standards for carbon monoxide.

(a) The eight-hour average concentration of carbon monoxide

in the ambient air must not exceed 9 ppmv (10 milligrams per

cubic meter) more than once per year.

(b) The one-hour average concentration of carbon monoxide

in the ambient air must - not exceed 35 ppmv (40 milligrams per

cubic meter) more than once per year.

(2) Measurement method. The levels of carbon monoxide in

the ambient air must be measured by:

(a) A FRM based on 40 C.F.R. Part 50, Appendix C and

designated according to 40 C.F.R. Part 53; or

(b) A FEM designated according to 40 C.F.R. Part 53.

13
(3) Interpretation method. An eight-hour average must be

considered valid if at least seventy-five percent of the hourly

averages for the eight-hour period are available. In the event

that only six (or seven) hourly averages are available, the

eight-hour average must be computed on the basis of the hours

available using six (or seven) as the divisor.

(4) Rounding of values. When summarizing data for

comparison with the standards, averages must be stated to one

decimal place. Comparison of the data with the levels of the

standards in ppmv must be made in terms of integers with

fractional parts of 0.5 or greater rounding up.

EPA analysis - these provisions are consistent with the EPA's carbon monoxide

standard contained in 40 CFR 50.8

NEW SECTION

WAC 173-476-170 Monitor siting criteria. Ambient monitors

must be sited as required in 40 C.F.R. Part 58.

EPA analysis -- the EPA encourages direct incorporation by reference of the monitor

siting criteria, as Ecology did above.

14
NEW SECTION

WAC 173-476-180 Reference conditions. (1) All measurements

of air quality that are expressed as mass per unit volume (e.

micrograms per cubic meter) must be corrected to:

(a) A reference temperature of 25°C; and

(b) A reference pressure of 760 millimeters of mercury

(1,013.2 millibars (hectopascals)).

(2) Exception for measurements of particulate matter (PM2.5) and Pb. Measurements of PM-2.5 and Pb must be reported

based on the actual ambient air volume measured at the actual

ambient temperature and pressure at the monitoring site during

the measurement period.

EPA analysis --- this provision is consistent with the EPA's reference conditions

contained in 40 CFR 50.3

NEW SECTION

WAC 173-476-900 Appendix A-Table of standards.

Disclaimer: This table is provided as an overview. See complete

rule for more detail.

15
Pollutant Averaging Time Level Remarks

Measurement

Method'

Interpretation

Method

Particle Pollution PM-10 24-hour 150 mg/m' Not to be exceeded

more than once per

year averaged over

3 years

40 C.F.R. Part 50,

Appendix J

40 C.F.R. Part 50,

Appendix K _

PM-2.5 Annual 12.0 kglm' Annual mean,

averaged over 3

years

40 C.F.R. Part 50;

Appendix L

40 C.F.R. Part 50,

Appendix N

24-hour 35 ,rglm' 98th percentile,

averaged over 3

years

Lead Rolling 3-month

average

0,15 lrg/m' Not to be exceeded 40 C.F.R. Part 50,

Appendix G

40 C.F.R. Part 50,

Appendix R

Sulfur Dioxide Annual 0.02 ppmv Not to be exceeded

in a calendar year

40 C.F,R, Part 50,

Appendix A or A-1

WAC 173-476-

130(3)

24-hour 0.1 ppm Not to be exceeded

more than once per

year

3-hour 0.5 ppm Not to be exceeded

more than once per

year

1-hour 75 ppb 99th percentile of

1-hour daily

maximum

concentrations,

averaged over 3

years

Nitrogen Dioxide Annual 53 ppb _ Annual Mean 40 C,F,R. Part 50,

Appendix F

40 C,F.R. Part 50,

Appendix S

1-how' 100 ppb 98th percentile of

1-hour daily

maximum

concentrations,

averaged over 3

years

Ozone 8-hour 0.075 ppm Annual fourthhighest daily

maximum 8-hr

concentration,

averaged over 3

years

40 C.F,R, Part 50,

Appendix D

40 C.F.R. Part 50,

Appendix P

Carbon Monoxide 8-how' 9 ppm Not to be exceeded

more than once per

year

40 C.F,R, Part 50,

Appendix C

WAC 173-476-

160(3)

1-hour 35 ppm

EPA analysis -- the summary information contained in this chart is consistent with the Ecology

rule language for each of the NAAQS.

16
Attachment B - the EPA's Review of Ecology's Draft SIP Revision

WASHINGTON STATE DEPARTMENT OF ECOLOGY

Including New Chapter 173-476 WAC into

the Washington State Implementation Plan

Rule SIP Revision

Air Quality Program

8/9/2013

17
What is submitted?

Ecology submits to the Environmental Protection Agency (EPA) a new rule, Ambient Air Quality

Standards, Chapter 173-476 WAC for inclusion into the Washington State Implementation Plan (SIP).

The new rule incorporates the current National Ambient Air Quality Standards (NAAQS) for criteria

pollutants. These standards are federally required and applicable statewide.

The new chapter replaces the following chapters of the Washington Administrative Code:

• Ch. 173-470 WAC Ambient Air Quality Standards for Particulate Matter (formerly Ch. 18-40

WAC)

• Ch. 173-474 WAC Ambient Air Quality Standards for Sulfur Oxides (formerly Ch. 18-56 WAC)

• Ch. 173-475 WAC Ambient Air Quality Standards for Carbon Monoxide, Ozone, and Nitrogen

Dioxide

These chapters are repealed. Of those chapters, WAC 173-4701 was approved into the SIP on January 15,

19932 . -

What Ecology would like EPA to do with the submittal?

Ecology proposes for EPA to take two actions:

Approve the new rule, Ambient Air Quality Standards, Ch. 173-476 WAC, into the SIP.

• Remove the repealed rule, National Ambient Air Quality Standards for Particulate Matter, Ch.

173-470 WAC, from the SIP.

Analysis of Submittal

The new rule incorporates the NAAQS, current as of August 2013, for the following air pollutants:

• Particulate matter (PM 10 )

• . Particulate matter (PM2.5)

• Lead (Ph)

• Sulfur oxides (SOx) (except for the annual and 24 hour standards)

• Nitrogen oxides (NOx)

• Ozone (03 )

• Carbon monoxide (CO)

The rule retains Washington's current annual and 24-hour state standards for sulfur oxides. They are

more stringent than the respective NAAQS.

1 Sections WAC 173-470-010, 020, and 160 were state adopted in 1987 and sections WAC 173-470-030 and 100

were state adopted in 1989.

2

58 FR 4578

18
The new rule does not include references to Total Suspended Particulate (TSP) found in SIP-approved

WAC 173-470(100)(1) and (2), EPA promulgated NAAQS for TSP in 1971. In 1987, EPA revised its

particulate matter standards changing the indicator from TSP to PM-10 to focus on "inhalable" particles

(<10 p.m), subsequently separating NAAQS for the "fine", PM 25i and "coarse", PM 10, fractions of PM 10 in

1997. Ecology adopted these newer, and more protective, NAAQS and repealed the outdated standards

for TSP.

EPA analysis -- the EPA agrees that it is appropriate for Ecology to remove the

revoked 1971 TSP standard.

The new rule also does not contain obsolete reporting requirement for local agencies found in SIPapproved WAC 173-470-160. Ecology and local clean air agencies have an elaborate monitoring network

in place that collects monitoring data. Ecology's staff has access to the data collected. The data are also

reported in real time on the agency's web site 3 . These data are being submitted regularly to EPA.

EPA analysis - the EPA agrees that the 1987 particulate matter reporting requirements

found in the SIP-approved version of Chapter WAC 173-470-160 are obsolete and it is

appropriate for Ecology to rely on the current monitoring network requirements

contained in 40 CFR 58. In a letter dated October 25, 2012, the EPA approved the

Washington Ambient Air Monitoring Network Plan which describes the

Washington monitoring network for 2012-2013.. This annual review satisfies the state

obligations under 40 CFR 58.

By consolidating existing criteria pollutant rules into one rule, adding a Lead (Pb) standard, incorporating

current federal NAAQS, and retaining existing, more stringent state SO2 standards, Ecology ensures it

can implement and maintain the NAAQS as required by the federal Clean Air Act.

Appendices below include:

• Appendix A: New Chapter 173-476 WAC, adopted on [insert adoption date], proposed to be

included into the SIP.

• Appendix B: Current SIP-approved Chapter 173-470 WAC in red strike out indicating proposed

removal from the SIP.

3

htt , :.j^www,ec^,l+va g^v(1rcJrarr s/^irf^%r monitori,ng^da,ta,^WAOA Intro Pageht3 i

19
Appendix A

insert new rule language

Appendix, B

,173-470-0-10 PURPOSE.

Ig-ated-unde-FAGW-70.94405-a.

rtic-u4-a-te-rha-tter in the-ah4tAe.ht air.

. A. A.. ., .A . IVA A .A

173-4-70-020

473-4-7-Q-430 DEFINITIONS,

eapter. -7-3-493-WAC,

TANDARDS,

,FA.ieFogfarrl pr-eubi-me ter-(-u-g-i-m-347,24-1440-r-a vraige-e-hee-h-tratio,-T-hest rd-is-at ta-i ned- when-he

-(2 ) The-4cvci of the aflaual-sta-h4la-Fd-for total sus ed-particulatc Is &i-xt-y-rn-ie-Fa-g-r-a4+1-s-pcr cub-i-c--m-e-te-F

eon cc ntr-at ieh:46-less-than er -eque-l-t-o-60-ug/fra,

(-a}-The-eNpect 7i+.Am,ber-of-iiays-pc4-c e.s-el-a-r-yea-r=-w-it-icr4-24-how-aver-age-ee nceatQt-ieh-alaGve

-50-ug./3i-as-de,tei-ieci-iff-aece.pEaee-with-0-C40-Appe,h4iix-K-a-s-ifa-effet-14u4y-I-1-98gi

d-ays-per-ea4ead-a-F-year-thiFe€l-2-4--h-otif- 1-ierr-abeve

150 ug/rn3 is cqua-14Q-er-less-t-han-o ,r4e,

20
(.14-The4ew-ei-ef4h-e-aanuastaR€i-fer-P am-per-cubic met

anit-matifaea-The-sta ndarA-i-s-atta-i-ae-d -w-h-e4 an-Rual-,alif4l.meti€-mean-effeentnat io a, as

defended-ift-aceef.dene-with-40-GF-50 Ap-pen-el-k-K-as-ir4-effec4-anduty4ri-9g8i5-les-s-thaProf equal to

50 /m3.

17- DATA.

f-i for pa rtieutate-FRatteic-shall-R

cation sha 11 b e rn a de4i-aii

.(a)-Lec-a-tin-af-sarNal-ef,

{.1a)T-ie-iaef-led-fday-and-yea-F),

.(e)-l-relividual-eneeh-ttieRs-reeer-clecl-atac-hair-menitening-s-tatlena

{Gi3 T-he-applieati4e-geetnith me tic m e,a n-far-eac-h4nan-ito-rin st a tienf-ifst-q4,arten-r-epeft

{ 4-If-partie4lat-e-matteF-vatues-gnea-ten-than-th-standards ar-e-measwed- tay-the-el pa=t ent,-the-a-i.r

-(b) Tim-e-er-tiff

(c) C-ar+eentr-atiens-reee-r4ed-.-

-)--T-he-a-pplieab I e eemetvic-of-af-it-14metieea 'n5fqua r-ter-r-eport-ca 4y-fo.r--p47esAous-c-a-teRd ar

yea r)

EPA analysis - removal of the 1993 SIP-approved version of Chapter WAC 173-470

Ambient Air Quality Standards for Particulate Matter is appropriate since all relevant

provisions are contained in the new rule, Chapter 173-476 WAC Ambient Air Quality

Standards.

21
A