UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION III 1650 Arch Street Philadelphia, Pennsylvania 19103

DATE: 7/9/2014

SUBJECT: Technical Support Document Regarding Lead Monitoring Data: Pennsylvania :

Lyons ; Clean Data Determination for the Lyon s 2008 Lead Nonattainment Area

FROM: Ellen Schmitt
, Life Scientist /s/ 7/8/2014

Office of Air Program Planning
Howard Schmidt, Environmental Scientist /s/ 7/9/2014 Office of Air Monitoring & Analysis

TO: File

THRU: Cristina Fernandez, Associ ate Director /s/ 7/8/2014

Office of Air Program Planning
Alice Chow, Associate Director /s/ 7/9/2014 Office of Monitoring & Analysis

This document provides a technical review of the air quality moni toring data used to support t he
Environme ntal Protection Agency ’s (EPA’s) proposed determination that the Lyons 2008 lead (Pb) n onattainment area has attained the 2008 lead n ational a mbient a ir q uality s tandard (NAAQS)

.

A. INTRODUCTION

EPA is proposing to determine that the Lyons A rea (bounde d by Kutztown Borough, Lyons
Bo rough, Maxatawny Township and Richmond Township) has clean data for the 2008 Pb NAAQS.2

B. BACKGROUND

On November 12, 2008 (73 FR 66964), EPA established a 2008 primary and secondary Pb NAAQS at 0.15 micrograms per cubic meter ( μg/m 3 ) based on a maximum arithmetic 3

- month
mean concentration for a 3

- year period. See 40 CFR 50.16. On November 22, 2010 (75 FR 71033), EPA published its initial air quality designations and classifications for the 2008 lead NAAQS based upon air qua lity monitoring data for calendar years 2007

- 2009

. The November 22, 2010 Federal Register publication included the nonattainment designation of an area located in Lyons, PA with in Berks County and which will hereby be referred to as “Lyons Area” or
“Area

. ” See CFR 81.339. The initial 2008 Pb NAAQ S designations, including the Lyons Area nonattainment designation, became effective on December 31, 2010. 1

On March 31, 2014, the Commonwealth of Pennsylvania, through the Pennsylvania Department of Environme ntal Protection (PADEP), submitted a request to EPA to make a determination that the Lyons nonattainment area for the 2008 Pb NAAQs has attained the 2008 Pb NAAQS, based on certified , quality

- controlled monitoring data from 2011 through 2013

.

EPA is propo sing to determine that the Lyons Area (bounde d by Kutztown Borough, Lyons
Bo rough, Maxatawny Township and Richmond Township) has clean data for the 2008 Pb NAAQS. This proposed determination for the Lyons nonattainment area would su spend the requirements to submit an attainment demonstration for the Lyons area, including associated
reasonabl y a vailable control measures (RACM), a reasonable further progress (RFP) plan, contingency measures, and any other planning SIPs related to attainment of the 2008 Pb
NA AQS

.

If this proposed determination is finalized, the suspension of the attainment demonstration requirements listed above would continue until such time, if any, that EPA subsequently determines that the area has violated the 2008 Pb NAAQS. If after notice

- and

- comment in the
Federal Register , the Area violates the 2008 Pb NAAQS, the basis for the suspension of these

1 EPA completed a second and final round of de signations for the 2008 Pb NAAQS on November 22, 2011. See 76 FR 72097. No additional areas in Pennsylvania were designated as nonattainment for the 2008 Pb NAAQS.3

attainment planning requirements would no longer exist for the Lyons Area, and the Area would thereafter have to address the pertinent r equirements.

The determination that EPA proposes with this Federal Register notice, that the air quality
data shows attainment of the 2008 Pb NAAQS, is not equivalent to the redesignation of th is area to attainment. This proposed action, if finalized, w ould not constitute a redesignation to attainment under section 107(d)(3) of the Clean Air Act (CAA), because EPA would not yet have an approved maintenance plan for the area
, as required under section 175A of the CAA, nor
a determination that the area ha s met the other requirements for redesignation. The
nonattainment designation status of the Lyons Area would remain for the 2008 Pb NAAQS until
such time , if any, that EPA determines that the area has met the CAA requirements for redesignation to attainmen t.

This p roposed determination that the Lyons Area has clean data for the 2008 Pb NAAQS
, and any final determination, will have no effect on, and is not related to, any future designation determination that EPA may make based on future lead NAAQS for the Lyons, PA
nonattainment area . Conversely, any future designation determination of the Lyons Area , based

on future lead NAAQS, will not have any effect on the determination proposed by this notice.

C. E PA’S REQUIREMENTS

1. EPA’s C lean D ata P olicy

Accordin g to CAA section 172(c)(1), attainment demonstration requirements “ shall provide
for attainment of the [NAAQS].” EPA has interpreted this r equirement as not applying to areas
that have attained the standard. If an area has attained the standard, there is no need to submit a plan demonstrating how the area will reach attainment. In the General Preamble (57 FR 13564), EPA stated that no other measures to provide for attainment would be needed by areas seeking redesignation to attainment since “ attai nment w ill have been reached.” See also Memorandum from John Calcagni, “ Procedures for Processing Requests to Redesignate Areas to Attainment, ” (September 4, 1992)

.4

A component of the attainment plan specified under section 172(c)(1) is the requirement to

prov ide for “ the implementation of all reasonably available control measures as expeditiously as practicable. ” Since RACM is an element of the attainment demonstration, see General Preamble (57 FR 13560), for the same reason the attainment demonstration no lo nger applies by its own terms, RACM also no longer applies. Furthermore, EPA has consistently interpreted this provision to require only implementation of pot ential RACM measures that could advance
attainment. 2 Thus, where an area is already attaining th e standard, no additional RACM measures are required.

In 1995, based on the interpretation of CAA sections 171 and 172, and section 182 in the General Preamble, EPA set forth what has become known as its “Clean Data Policy” for the 1

- hour ozone NAAQS. See Memorandum from John S. Seitz, Director, Office of Air Quality Planning and Standards, “ RFP, Attainment Demonstration, and Related Requirements for Ozone Nonattainment Areas Meeting the Ozone Nationa l Ambient Air Quality Standard” (May 10, 1995). In 2004, EPA indicated its intention to extend the Clean Data Policy to the fine particulate matter ( PM 2.5 ) NAAQS. See Memorandum from Steve Page, Director, EPA Office of Air Qu ality Planning and Standards, “ Clean Data Policy for the Fine Particle National A mbient Air Quality Standards” (December 14, 2004).

CAA section 172(c)(2) provides that state implementation plan (SIP) provisions in nonattainment areas must require “ reasonable further progress. ” The term “ reasonable further

progress ” is defined in sec tion 171(1) as “ such annual incremental reductions in emissions of the relevant air pollutant as are required by this part or may reasonably be required by the Administrator for the purpose of ensuring attainment of the applicable NAAQS by the applicable
d ate.” Thus, by definition, the “ reasonable further progress ” provision requires only such reductions in emissions as are necessary to attain the NAAQS. If an area has attained the NAAQS, the purpose of the RFP requirement has been fulfilled, and since th e area has already attained, showing that the State will make RFP towards attainment the RFP requirement “ [has] no meaning at that point. ” General Preamble, 57 FR 13498, 13564 (April 16, 1992).

2 This interpretation was adopted in the General Preamble, see 57 FR 13498, and has been upheld as applied to the Clean Data Policy, as well as to nonattainment SIP submissions. See NRDC v. EPA , 571 F.3d 1245 (D.C. Cir. 2009); Sierra Club v. EPA , 294 F.3d 155 (D.C. Cir. 2002).5

CAA section 172(c)(9) provides that SIPs in nonattainment ar eas “ shall provide for the implementation of specific measures to be undertaken if the area fails to make reasonable further progress, or to attain the [NAAQS] by the attainment date applicable under this part. Such measures shall be included in the plan revision as contingency measures to take effect in any such case without further action by the State or [EPA]. ” This contingency measure requirement is inextricably tied to the reasonable further progress and attainment demonstration requirements.
Contin gency measures are implemented if reasonable further progress targets are not achieved, or if attainment is not realized by the attainment date. Where an area has already achieved attainment by the attainment date, it has no need to rely on contingency me asures to come into attainment or to make further progress to attainment. As EPA stated in the General Preamble:

“ The section 172(c)(9) requirements for contingency measures are directed at ensuring RFP and attainment by the applicable date. ” See 57 FR 13564. Thus these requirements no longer apply
when an area has attained the standard.

2. EPA’s R equirements for C ompliance with the 2008 L ead NAAQS
The 2008 Pb NAAQS are met when the maximum arithmetic 3

- month mean concentration
for a 3

- year period, as d etermined in accordance with 40 CFR part 50, Appendix R, is less than or equal to the 2008 Pb NAAQS level of 0.15 μg/m 3

. The 2008 Pb NAAQS design value for an
area is de termined by the highest valid 3

- month arithmetic mean concentration identified within

a 38

- month period that consists of the most recent 3

- year calendar period (36 months) plus the two preceding months, for a total of 36 3

- month periods. Therefore, a n area’s design value meets the 2008 Pb NAAQS when, for all relevant monitoring sites, the maximum arithmetic 3

- month mean concentration for the applicable 38

- month period is less than or equal to 0.15 μg/m 3

.

3

- month means A 3

- month mean is determined by averaging three consecutive monthly means. A monthly mean is the average concentration for an individual calendar month and is calculated using a ll available valid daily data for that month, giving equal weight to each day. 3 , 4 E a ch distinct monthly mean will be included in three (3)

3 According to 40 CFR 50.12, the state or local government agency that is responsible for monitoring under the CAA, must collect at least one 24

- hour ambient air lead sample every 6 days except during periods or seasons exempted by the Regional Administrator.6

different 3

- month means

. For example, the November 2011 mon thly mean would be included in: (1) The September 2011

- October 2011

- November 2011
3

- month mean, (2) the October 2011

- November 2011

- December 2011 3

- month mean, and (3) the November 2011

- December 2011

- January 2012 3

- month

mean. According to 40 CFR 50, Appen dix R, 3

- month means are computed on a rolling, overlapping basis. As a convention, t he name of the 3

- month mean is
based on the last month included in the calculation (e.g., the “ November 2011 ”
3

- month rolling mean includes the September , October, and No vember 2011 monthly means). The procedures for calculating monthly means and 3

- month means, and identifying Pb design values are given in section six ( 6 ) of 40 CFR part 50, Appendix R.

Completeness requirements and substitution tests (as specified in 40 CFR part 50, Appendix R) A 3

- month mean is considered valid if the average of the data capture rate of the three constituent monthly means is greater than or equal to 75 percent ( % )

. The capture rate of a monthly mean is determined by the number of schedu led sampling days within that month that produced valid data. If a 3

- month mean
does not have at least a 75% data capture and therefore is not considered valid (or complete ) , it can still be used when calculating the design value if it passes
one of the t wo data substitution tests described in 40 CFR part 50, Appendix R. The type of substitution test used is based on if, using the available incomplete data, the result is above or below 2008 Pb NAAQS (0.15 μg/m 3 )

.

W hen a 3

- month mean, calculated using inc omplete data, is violating (i.e.
, above) the NAAQS, the “above

- the

- NAAQS

- level” substitution test can be used
for each month of the 3

- month period with less than 75% data. This test consists of substituting the lowest reported daily value for that month ( year non

- specific; e.g. January) , over the 38

- month design value period, in place of the missing data in the incomplete months, substituting only enough to meet the 75 % data capture
minimum. If the recalculated 3

- month mean concentration is above the leve l of

4 Valid daily samples are those that follow the conventio ns found under 40 CFR part 50, Appendix R.7

the 2008 Pb NAAQS, then the 3

- month period is considered to have “ passed ” the
test and the level of the standard is deemed to have been exceeded in that 3

- month period

.

If an incomplete 3

- month mean is below the NAAQS, the “below NAAQS level”

test ca n be applied in each month of the 3

- month period with less than 75% data,
but at least 50%. This test consists of substituting the highest reported daily
value for that particular month, over th e 38

- month design value period, will be used in place of the missing data in the incomplete period
, to bring the data capture rate up to 100%. If the recalculated 3

- month mean concentration is equal

to or is less than the 2008 Pb NAAQS level , then the 3

- month period is deemed
to have “ passed ” the test and the level of the standard is deemed not to have been
exceeded in that 3

- month period.

Both substitution tests are merely diagnostic in nature intending to confirm that there is a very high likelihood if not certainty that the incomplete 3

- month mean (the one based on actual reported data ) reflects the true over/under NAAQS level
status for that 3

- month period. The recalculated 3

- month mean from either of
these data substitution tests is not considered the actual 3

- month mean and shall
not be used in the determinat ion of design values. The 3

- month mean of the data actually reported , even if incomplete, shall be the one used to determine the site’s des ign value.

D. EPA’S EVALUATION OF THE LYONS AREA’S LEAD AIR MONITORING DATA

1. Lyons Area’s A ir M onitoring D ata for the 2008 Lead NAAQS
The Lyons Area ’s monitoring network consists of two monitoring locations : Lyons Boro ( AQS ID 42

- 011

- 0021) with one Federal Equivalent M ethod ( FEM ) monitor and Lyons Park ( AQS ID 42

- 0 1 1

- 0022) with collocated FEM monitor s

. Monitors at bot h Lyons Boro and Lyons Park were placed into service on January 2, 2010. Monitor locations were determined through a modeling analysis completed by PADEP and a site selection process which includes, but is not8

limited to, evaluating land/ lease availabilit y, worker safety, accessing electricity, and coordinating with the EPA regional office.

The Commonwealth of Pennsylvania submitted quality assured, quality controlled, and certified air quality monitoring data for the 2008 lead NAAQS into EPA’s Air Qual ity System (AQS) database. EPA has reviewed the ambient air monitoring data for lead for the Lyons Area in accordance with the provisions of 40 CFR part 50, Appendix R. The monitoring data evaluated for the Lyons Area corresponds to the 36 3

- month means collected during the 38 months from November 2010 to December 2013, which is the most recent certified, quality

assured, quality

- controlled data available for the Area.

2. Incompleteness Issues and Data Substitution for Lyons Boro Monitoring Site
The Lyon s Park (ID 42

- 011

- 0022) collocated monitors have complete data for the 2011

- 2013 rolling 3

- month period. T he Lyons Boro monitoring site (ID 42

- 011

- 0021) did not meet the completeness criteria for two 3

- month periods : November 2011 (i.e., September to Nov ember of
201 1 ) and December 2012 (i.e., October to December 2012 ). Table 1, below, provides the monthly means, 3

- month mean, and capture rates for the Lyons Boro monitor during the 38

- month monitoring period . Table 1 also identifies the validity of each 3

- month mean value.9

Table 1. Lyons Boro Monitoring Site Data , from November 2010 to December 2013

Year Month Monthly Mean (μg/m 3 ) Monthly

Capture Rate 3

- month

Mean (μg/m 3 ) 3

- month

Capture Rate Valid 3

-

month mean? Y/N 2010 November 0.04 64 100 % 0 .05 87 % Y 2010 December 0.0478 100 % 0 .05 87 % Y 2011 January 0.01525 80 % 0 .04 93 % Y 2011 February 0.0224 100% 0 .03 93 % Y 2011 March 0.0116 100% 0 .02 93 % Y 2011 April 0.01575 80 % 0 .02 93 % Y 2011 May 0.012 100% 0 .01 93 % Y 2011 June 0.0532 100% 0 .03 93 % Y 2011 July 0.0324 100% 0 .03 100 % Y 2011 August 0.0397 100% 0 .04 100 % Y 2011 September 0.0333 80 % 0.04 93% Y 2011 October 0.04625 80% 0.04 87% Y 2011 November 0.0200 60% 0.03 73% N 2011 December 0.0216 100% 0 .03 80 % Y 2012 January 0.0322 1 00% 0 .02 87 % Y 2012 February 0.0362 100% 0 .03 100% Y 2012 March 0.0422 100% 0 .04 100% Y 2012 April 0.0240 100% 0 .03 100% Y 2012 May 0.0138 100% 0 .03 100% Y 2012 June 0.0392 100% 0 .03 100% Y 2012 July 0.02975 80 % 0 .03 93 % Y 2012 August 0.03225 67 % 0

. 03 82 % Y 2012 September 0.0988 100 % 0 .05 82 % Y 2012 October 0.02125 80 % 0 .05 82 % Y 2012 November 0.0127 60% 0 .04 80 % Y 2012 December 0.0160 80 % 0 .02 73 % N 2013 January 0.0284 100% 0 .02 80 % Y 2013 February 0.0180 100% 0 .02 93 % Y 2013 March 0.0130 100 % 0 .02 100% Y 2013 April 0.0502 100% 0 .03 100% Y 2013 May 0.0410 100% 0 .03 100% Y 2013 June 0.0308 100% 0 .04 100% Y 2013 July 0.0272 100% 0 .03 100% Y 2013 August 0.0628 100% 0 .04 100% Y 2013 September 0.0184 100% 0 .04 100% Y 2013 October 0.0383 100% 0 .04 100% Y 2013 November 0.0230 100% 0 .03 100% Y 2013 December 0.0436 100% 0 .03 100% Y10

As seen in table 2 , below, the Lyons Boro monitor failed to obtain two out of the six required valid samples in November 2011, thereby only having a 60% capture r ate for that month. Although the previous two months (September and October 2011) each had greater than a 75% capture rate, the overall 3

- month capture rate for the November 2011 rolling 3

- month period was 73%, less than the required 75% needed for a 3

- mo nth sample to be considered complete.

Table 2

. Lyons Boro Monitoring Site Incomplete Data , September to November 2011

Month/Year Sample

Date Daily

Value (μg/m 3 ) Monthly

Mean (μg/m 3 ) Monthly

Capture Rate 3

- month

Mean (μg/m 3 ) 3

- month

Capture Rate

Septem ber 2011 6

- Sept

- 11 0.011

0.0333 80%

0.03 73%

12

- Sept

- 11 x 18

- Sept

- 11 0.011 24

- Sept

- 11 0.035 30

- Sept

- 11 0.076

October 2011 6

- Oct

- 11 0.038

0.04625 80%

12

- Oct

- 11 0.011 18

- Oct

- 11 0.047 24

- Oct

- 11 0.089 30

- Oct

- 11 x

November 2011 5

- Nov

- 11 0.012

0.0200 60%

11

- Nov

- 11 0.037 17

- Nov

- 11 x 23

- Nov

- 11 x 29

- Nov

- 11 0.011 Note: “x” indicates that no valid data was captured on that day.

The data in table 3 , below, show that the individual month ly capture rates for the Lyons Boro monitor’s December 2012 rolling 3

- month period are as follows: October 2012, 80%, November 2012, 60%, and December 2012, 80%. The resulting 3

- month capture rate for the Lyons Boro monitor’s December 2012 rolling 3

- mont h capture rate is 73%, below the required 75% needed
for a 3

- month sample to be considered complete.11

Table 3

. Lyons Boro Monitoring Site Incomp l ete Data , Octo ber to December 201 2
Month/ Year Sample

Date Daily

Value (μg/m 3 ) Monthly

Mean (μg/m 3 ) Mon thly

Capture Rate 3

- month

Mean (μg/m 3 ) 3

- month

Capture Rate

October 2012 6

- Oct

- 12 0.022

0.02125 80%

0.02 73%

12

- Oct

- 12 0.029 18

- Oct

- 12 0.010 24

- Oct

- 12 0.024 30

- Oct

- 12 x

November 2012 5

- Nov

- 12 0.011

0.0127 60%

11

- Nov

- 12 0.016 17

- Nov

- 12 0.011 23

- Nov

- 12 x 29

- Nov

- 12 x

December 2012 5

- Dec

- 12 0.011

0.0160 80%

11

- Dec

- 12 x 17

- Dec

- 12 0.011 23

- Dec

- 12 0.031 29

- Dec

- 12 0.011 Note: “x” indicates that no valid data was captured on that day.

T he incomplete November 2011 and December 2012 3

- month mean values were both below
the level of the 2008 Pb NAAQS. To determine whether these two 3

- month means are valid for determining compliance with the 2008 lead NAAQS , EPA applied the below

- NAAQS

- lev el data
substitution test to the incomplete 3

- month periods from the Lyons Boro monitor

.

Data substitution calculation for Lyons Boro’s incomplete data for the November 2011 3

- month period As shown in table 4, below, t he 3

- month mean concentration for S eptember 2011 through November 2011 is 0.03  g/m 3 (see table 2) with missing Pb daily sample s on 9/12/2011, 10/30/2011, 11/17/2011 , and 11/23/2011. The highest reported daily values for the se particular incomplete months (i.e., September, October, and November) over the 38

- month period of November 2010 to December 2013 were used to fill in for the missing data during each month of the incomplet e 3

- month period

. The following highest values were used : 0.324

 g/m 3 for September, 0.096  g/m 3 for October, and 0.060  g/m 3 for November.
The “test” or re calculated 3

- month mean for the Lyons Boro incomplete12

November 2011 period is 0.06  g/m 3 after using the month

- specific maximums as replacement values for the four missing samples.

Table 4

. Data Substitution for Lyons Boro Monitoring Site Incomplete Data , September to

November 2011

Month/Year Sample

Date Daily

Value (μg/m 3 ) Substituted

Data (μg/m 3 ) Re

calculated Monthly Mean (μg/m 3 ) Monthly

Capture Rate “Test”

3

- month Mean (μg/m 3 ) 3

- month

Capture Rate

September 2011 6

- Sept

- 11 0.011

-

0.091 1 00%

0.06 100%

12

- Sept

- 11 x 0.324 18

- Sept

- 11 0.011

- 24

- Sept

- 11 0.035

- 30

- Sept

- 11 0.076

-

October 2011 6

- Oct

- 11 0.038

-

0.056 100%

12

- Oct

- 11 0.011

- 18

- Oct

- 11 0.047

- 24

- Oct

- 11 0.089

- 30

- Oct

- 11 x 0.096

N ovember 2011 5

- Nov

- 11 0.012

-

0.036 100%

11

- Nov

- 11 0.037

- 17

- Nov

- 11 x 0.060 23

- Nov

- 11 x 0.060 29

- Nov

- 11 0.011

- Note: “x” indicates that no valid data was captured on that day ; “

- ” indicates that no substitution data applies.

Data substitution calculation for Lyons Boro’s incomplete data for the December 2012 3

- month period As shown in table 5, below, t he 3

- month mean concentration for October 2012 through December 2012 is 0.02  g/m 3 (see table 3) with missing Pb daily sample s on 10/30/2012, 11/23/2012, 11/29/2012 , and 12/11/2012. The highest reported daily values for the se particular incomplete months (i.e., October, November , and
December ) over the 38

- month period of November 2010 to December 2013 were used to fill in for the missing data during each the incomplete 3

- month period. The following highest values were used : 0.096  g/m 3 for October, 0.060  g/m 3

for November, and 0.107  g/m 3 for December. The “test” 3

- month mean fo r Lyons Boro incomplete December 2012 period is 0.03  g/m 3 after using the
month

- specific maximums as replacement values for the four missing samples.13

Table 5

. Data Substitution for Lyons Boro Monitoring Site Incomplete Data , September to

November 2011

Mo nth/Year Sample

Date Daily

Value (μg/m 3 ) Substituted

Data Re

calculated Monthly Mean (μg/m 3 ) Monthly

Capture Rate “Test”

3

- month Mean (μg/m 3 ) 3

- month

Capture Rate

October 2012 6

- Oct

- 12 0.022

-

0.036 100%

0.03 100%

12

- Oct

- 12 0.029

- 18

- Oc t

- 12 0.010

- 24

- Oct

- 12 0.024

- 30

- Oct

- 12 x 0.096

November 2012 5

- Nov

- 12 0.011

-

0.032 100%

11

- Nov

- 12 0.016

- 17

- Nov

- 12 0.011

- 23

- Nov

- 12 x 0.060 29

- Nov

- 12 x 0.060

December 2012 5

- Dec

- 12 0.011

-

0.034 100%

11

- Dec

- 12 x 0.107 17

- Dec

- 12 0.011

- 23

- Dec

- 12 0.031

- 29

- Dec

- 12 0.011

-

After making the data substitutions , the re

- calculated 3

- month means for November 2011 ( 0.06  g/m 3 ) , and December 2012 ( 0.03  g/m 3 ) are below the level of the 200 8 Pb standard (0.15

 g/m 3 ) . This indicates that the t hree 3

- month means have “ passed ” the substitution test and that the level of the standard is deemed not to have been exceeded during each of these 3

- month periods. The recalculated 3

- month means from t he data substitution test are not considered the
actual 3

- month mean and were not used in the determination of design values. The 3

- month

mean s of the data actually reported , even if incomplete, were used to determine the site

- specific
des ign value s

. T hu s, the 3

- month means actually reported during September to November 2011 (0.03  g/m 3 ) and October to December 2012 (0.02  g/m 3 ), which were calculated using incomplete data, are considered valid
, and were used in calculating the 2011

- 2013 design value for the Lyons Area.14

3. L yo ns Area’s 2013 Design Values for the 2008 Pb NAAQS
The design values for the Lyons Boro and Lyons Parks monitors, based on certified, quality

controlled monitoring data from 2011 through 2013 can be found in table 6 . As shown in table 6
below , the highest site specific design value for the Lyons Area is 0.05 μg/m 3 , based on data for Lyons Boro monitoring site. Thus, in accordance with 40 CFR 50 and based on valid data, the Lyons Area’s design value for 2011

- 2013 is 0.05 μg/m 3 , which is well below the level of the 2008 lead NAAQS of 0.15 μg/m 3

.

Table 6

. Lyons Area ’s 2011

- 2013 Design Values for the 2008 Pb NAAQS
Site Name AQS Site ID 2011

- 2013 Design Values (μg/m 3 ) Lyons Boro 42

- 011

- 0021 0.05 Lyons Park 42

- 011

- 0022 0.04

D. CONCLUSIONS AND RECOMMENDED AGENCY ACTIONS

C onsistent with the requiremen ts in 40 CFR part 50 , EPA has reviewed the Lyons Area ambient air monitoring data for Pb, and found that t he highest 3

- month mean concentration for
2011

- 2013 , that is the 2011

- 2013 design value for the Area, is less than 0.15 μg/m 3

. Thus, this finding sup ports EPA ’s proposed determination that the Lyons nonattainment area has attained the 2008 Pb NAAQS , based on the most recent quality

- assured, quality

- controlled, and certified monitoring data for 2011

- 2013

.