UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

DESIGN VALUE REPORT Jul. 23, 2014 Report Request ID: 1235881 Report Code: AMP480

Selection Criteria Page 1 User ID: YGX

State County City Site Parameter POC AQCR UAR CBSA CSA EPA Region 06 045 GEOGRAPHIC SELECTIONS

PROTOCOL SELECTIONS Parameter Classification Parameter Method Duration DESIGN VALUE 88101

SELECTED OPTIONS

SINGLE EVENT PROCESSING WORKFILE DELIMITER USER SITE METADATA MERGE PDF FILES QUARTERLY DATA IN WORKFILE

AGENCY ROLE Option Type Option Value EXCLUDE REGIONALLY CONCURRED EVENTS

, STREET ADDRESS YES NO PQAO DATE CRITERIA

2000 Start Date End Date 2013 Tribal Code

APPLICABLE STANDARDS Standard Description PM25 24-hour 2013 PM25 Annual 2013UNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 1 of 16UNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 2 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2000

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2000 1999 1998

06-045-0006 105 N MAIN ST, UKIAH, CA 95482 57 3 18.7* 7.2* 57 4 26.2 8.9 0 0 * * 22 N 8.0 NUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 3 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2001

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2001 2000 1999

06-045-0006 105 N MAIN ST, UKIAH, CA 95482 57 4 27.0 8.0 57 3 18.7 * 7.2 * 57 4 26.2 8.9 24 Y 8.0 YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 4 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2002

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2002 2001 2000

06-045-0006 105 N MAIN ST, UKIAH, CA 95482 61 4 39.7 9.1 Y 57 4 27.0 8.0 57 3 18.7* 7.2* 28 Y 8.1 YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 5 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2003

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2003 2002 2001

06-045-0006 105 N MAIN ST, UKIAH, CA 95482 60 4 15.2 7.4 N 61 4 39.7 9.1 Y 57 4 27.0 8.0 27 Y 8.1 YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 6 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2004

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2004 2003 2002

06-045-0006 105 N MAIN ST, UKIAH, CA 95482 60 4 14.4 7.0 N 60 4 15.2 7.4 N 61 4 39.7 9.1 Y 23 Y 7.8 YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 7 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2005

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2005 2004 2003

06-045-0006 105 N MAIN ST, UKIAH, CA 95482 61 4 15.2 6.2 N 60 4 14.4 7.0 N 60 4 15.2 7.4 N 15 Y 6.8 YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 8 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2006

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2006 2005 2004

06-045-0006 105 N MAIN ST, UKIAH, CA 95482 60 4 17.4 6.8 61 4 15.2 6.2 N 60 4 14.4 7.0 N 16 Y 6.7 YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 9 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2007

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2007 2006 2005

06-045-0006 105 N MAIN ST, UKIAH, CA 95482 60 4 13.3 4.7 60 4 17.4 6.8 61 4 15.2 6.2 N 15 Y 5.9 YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 10 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2008

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2008 2007 2006

06-045-0006 105 N MAIN ST, UKIAH, CA 95482 61 4 31.0 7.9 60 4 13.3 4.7 60 4 17.4 6.8 21 Y 6.5 YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 11 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2009

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2009 2008 2007

06-045-0006
06-045-2001
06-045-2002 105 N MAIN ST, UKIAH, CA 95482
FIRE STN-COMMERCIAL & HUMBOLDT, WILLITS WILLITS JUSTICE CENTER, 125 EAST COMMERCIAL STREET, WILLITS, CA 95490 332
217
108 3

2
1 19.6
22.7
30.8 *

*

* 11.6
14.1
10.2 *

*

* 61

0
0 4

0
0 31.0

*

* 7.9

*

* 60

0
0 4

0
0 13.3

*

* 4.7

*

* 21

23
31 Y
N
N 8.1
14.1
10.2 Y

N
NUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 12 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2010

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2010 2009 2008

06-045-0006
06-045-2001
06-045-2002 105 N MAIN ST, UKIAH, CA 95482
FIRE STN-COMMERCIAL & HUMBOLDT, WILLITS WILLITS JUSTICE CENTER, 125 EAST COMMERCIAL STREET, WILLITS, CA 95490 360
0
352 4

0
4 14.0

17.8 * 6.5

7.7 * 332

217
108 3

2
1 19.6
22.7
30.8 *

*

* 11.6
14.1
10.2 *

*

* 61

0
0 4

0
0 31.0

*

* 7.9

*

* 22

23
24 Y
N
N 8.7
14.1
8.9 Y
N
NUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 13 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2011

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2011 2010 2009

06-045-0006
06-045-2001
06-045-2002 105 N MAIN ST, UKIAH, CA 95482
FIRE STN-COMMERCIAL & HUMBOLDT, WILLITS WILLITS JUSTICE CENTER, 125 EAST COMMERCIAL STREET, WILLITS, CA 95490 356
0
352 4

0
4 15.4

20.8 * 7.6

9.8 * 360

0
352 4

0
4 14.0

17.8 * 6.5

7.7 * 332

217
108 3

2
1 19.6
22.7
30.8 *

*

* 11.6
14.1
10.2 *

*

* 16

23
23 Y
N
N 8.6
14.1
9.2 Y
N
NUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 14 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2012

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2012 2011 2010

06-045-0006
06-045-2002 105 N MAIN ST, UKIAH, CA 95482 WILLITS JUSTICE CENTER, 125 EAST COMMERCIAL STREET, WILLITS, CA 95490 290
349 3

4 15.4
19.1 * 4.9

7.2 * S

S 356
352 4

4 15.4
20.8 7.6

9.8 360

352 4

4 14.0
17.8 6.5

7.7 15

19 N
Y 6.3

8.2 N
YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 15 of 16 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2013 / PM25 Annual 2013 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2013

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 12 35 State Name: California
Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2013 2012 2011

06-045-0006
06-045-2002 105 N MAIN ST, UKIAH, CA 95482 WILLITS JUSTICE CENTER, 125 EAST COMMERCIAL STREET, WILLITS, CA 95490 85
163 1

1 17.5
23.0 *

* 7.6
9.3 *

* S
S 290
349 3

4 15.4
19.1 * 4.9

7.2 * S

S 356
352 4

4 15.4
20.8 7.6

9.8 16

21 N
N 6.7

8.8 N
NUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jul. 23, 2014

Notes:1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 16 of 16 M

N

S

U

X

Y The monitoring organization has revised data from this monitor since the

most recent certification letter received from the state. The certifying agency has submitted the certification letter and required summary reports, but the certifying agency and/or EPA has determined that issues regarding the quality of the ambient concentration data cannot be resolved due to data completeness, the lack of performed quality assurance checks or the results of uncertainty statistics shown in the AMP255 report or the certification and quality assurance report. The certifying agency has submitted the certification letter and required summary reports. A value of "S" conveys no Regional assessment regarding data quality per se. This flag will remain until the Region provides an "N" or "Y" concurrence flag. Uncertified. The certifying agency did not submit a required certification letter and summary reports for this monitor even though the due date has passed, or the state's certification letter specifically did not apply the certification to this monitor. Certification is not required by 40 CFR 58.15 and no conditions apply to be the basis for assigning another flag value The certifying agency has submitted a certification letter, and EPA has no unresolved reservations about data quality (after reviewing the letter, the attached summary reports, the amount of quality assurance data submitted to AQS, the quality statistics, and the highest reported concentrations). MEANING CERTIFICATION EVALUATION AND CONCURRENCE FLAG MEANINGS

FLAG