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- 1 ENCLOSURE 1

Revised Recommended California Nonattainment Area s for the Federal 8

- Hour O zone Standard Based on 200 8

- 20 10 Ozone Air Quality Data

Nonattainment Area Design

Value 1
(ppm) Area Included

Antelope Valley 0.091 Portion of Los Angeles County in Mojave Desert

Air Basin

Butte County 0.079 Butte County

Calaveras County 0.083 Calaveras County

Coachella Valley 0.095 Coachella Valley portion of Riverside County

Eastern Kern County 0.083 Mojave Desert Air Basin portion of Kern County, excluding In dian Wells Valley

Eastern San Luis Obispo County 0.084 Eastern San Luis Obispo County

Imperial County 0.078 Imperial County

Mariposa County 0.083 Mariposa County

Sacramento Metro Area 0.102 Sacramento, Yolo, eastern Solano, southern Sutter, and weste rn portions of El Dorado and

Placer counties

San Diego County 0.088 San Diego County

San Francisco Bay Area 0.080 Marin, southern Sonoma, Napa, western Solano, Contra Costa, Alameda, Santa Clara, San Francisco, and San Mateo counties

San Joaquin Valley 0.104 San Joaquin, Stanislaus, Merced, Madera, Fresno, Kings, Tulare, and western Kern counties

South Coast Air Basin 0.112 Western Los Angeles (including Catalina and San Clemente Islands), Orange, southwestern San Bernardino, and western Riverside coun ties

Tuscan Buttes 0.080 Tuscan Buttes in Tehama County above 1800’

Ventura County 0.086 Mainland portion of Ventura County (excludes Anacapa and San Nicolas islands)

Western Mojave Desert 0.099 Central San Bernardino County

Western Nevada County 0.084 Portion of Nevada County west of the crest of the

Sierra Nevada

1 The design value is the 3

- year average of the annual fourth highest 8

- hour ozone concentration

for the highest monitor in the area (if greater than 0.075 ppm = nonattainment; if less than or equal to 0.075 = attainment).

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- 2 Re vised Recommended California Attainment Area s for the Federal 8

- Hour Ozone Standard

Attainment Area Design

Value 1
(ppm) Design

Value

Period Area Included

Amador County 0.07 1 2009

- 2011 Amador County

Colusa County 0. 066 2008

- 2010 Colusa County

Glenn County 0.066 2008

- 2010 Glenn County

Lake County 0.061 2008

- 2010 Lake County

North Central Coast Air

Basin 0.069 2009

- 2011 Monterey, San Benito, and Santa Cruz

counties

North Coast Air Basin 0.053 2008

- 2010 Del Norte, H umboldt, Mendocino, and Trinity

counties and the North Coast Air Basin portion of Sonoma County

Northeast Plateau Air

Basin 0.060 2008

- 2010 Lassen, Modoc, and Siskiyou counties

Northeast

San Bernardino and

Eastern Riverside

Counties 0.075 2008

- 2010 Moja ve Desert portion of San Bernardino County outside the Western Mojave Desert ozone nonattainment area and Mojave Desert portion of Riverside County

Shasta County 0.075 2008

- 2010 Shasta County

Southern Inyo County 0.072 2008

- 2010 Inyo County portions of f ederal hydrologic
units 16060015, 18090202, 18090203,
18090204, and 18090205

Sutter and Yuba

Counties 0.076 2 2008

- 2010 Yuba County and portion of Sutter County outside Sacramento Metro Area (including Sutter Buttes area)

Tehama County 0.074 2008

- 2010 Po rtion of Tehama County outside Tuscan

Buttes area

Tuolumne County 0.074 2009

- 2011 Tuolumne County

Santa Barbara County 0.073 2009

- 2011 Mainland portion of Santa Barbara County (excludes San Miguel, Santa Barbara, Santa Cruz, and Santa Rosa islands)

We stern San Luis Obispo County 0.065 2008

- 2010 Portion of County west of Eastern San Luis Obispo area

1 The desi gn value is the 3

- year average of the annual fourth highest 8

- hour ozone concentration

for the highest monitor in the area (if greater than 0.075 ppm = nonattainment; if less than or equal to 0.075 = attainment). 20 11 data are preliminary.

2 2011 data not yet available, but will likely show attainment.

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- 3 Recommended California Unclassifiable Areas

for the Federal 8

- Hour Ozone Standard

Unclassifi

able Area Area Included

Eastern Nevada County Portion of Nevada County east of the crest of the

Sierra Nevada mountains

Great Basin Valleys Alpine County, Mono County, portion of Inyo County outside Southern Inyo County attainment area

Indian Wells Va lley Existing Indian Wells Valley area in Eastern Kern County

Lake Tahoe Air Basin Lake Tahoe Air Basin portions of El Dorado and

Placer counties

Northern Channel Islands The islands located in the South Central Coast Air Basin, including Anacapa, San Mi guel, San Nicolas, Santa Barbara, Santa Cruz, and Santa Rosa

Northern Mountain Counties Plumas and Sierra counties

### ENCLOSURE 2

STATE OF CALIFORNIA BOUNDARY DESCRIP TIONS

FOR NEW RECOMMENDED DESIGNATION AREAS

UNDER THE 2008 FEDERAL 8

- HOUR OZONE STANDARD

AMADOR COUNTY

All of Amador County.

EASTERN SAN LUIS OBISPO COUNTY

That portion of San Luis Obispo Cou nty that lies east of a line described as follows: Beginning at the San Luis Obispo County / Santa Barbara County boundary and running north along 120 degrees 24 minutes longitude to the

intersection with 35 degrees 27 minutes latitude; east along 35 degr ees
27 minutes latitude to the intersection with 120 degrees 18 minutes longitude; then north along 120 degrees 18 minutes longitude to the San Luis Obispo County / Monterey County boundary.

INDIAN WELLS VALLEY

That portion of Kern County that coincide s with the Kern County portion of

H ydrologic U nit #18090205.

SOUTHERN INYO COUNTY

That portion of Inyo County that lies within the bounds of H ydrologic Unit

Number 16060015 , 18090202, 18090203, 18090204, and 18090205.

TUOLUMNE COUNTY

All of Tuolumne County.

TUSCAN BUTTES (TEHAMA COUNTY)

That portion of the immediate Tuscan Buttes area at or above 1,800 feet in

elevation.