Air Resources Board 

Mary D. Nichols, Chairman 

Linda S. Adams 1001 1 Street P.O. Box 2815 Arnold Schwarzenegger 

Secretary for Sacramento, California 95812 www.arb.ca.gov Governor 

Env~ronrnental Protection 

July 14, 2010 

Mr. Jared Blumenfeld 

Regional Administrator 

U.S. Environmental Protection Agency 

Region 9 

75 Hawthorne Street 

San Francisco, California 941 05 

Dear Mr. Blumenfeld: 

The Air Resources Board (ARB) is transmitting to the United States Enviror~~iiental 

Protection Agency (U.S. EPA) the 2010 Coso Junction PMIO Redesignation Request 

and Maintenance Plan (Plan) for the Coso Junction Planning Area developed by the 

Great Basin Unified Air Pollution Control District (GBUAPCD). The District adopted the 

Plan on May 17,201 0 and transmitted it to ARB on May 19. ARB approved the Plan on 

June 24 as a revision to the California State Implementation Plan. 

This package consists of two hard copies and one compact disk of the following 

materials. 

I. May 19, 201 0, letter from Mr. Theodore D. Schade, Air Pollution Control Officer for 

GBUAPCD, transmitting: 

A. Governing Board Resolution 2010-01 (Attachment 1): 

Approving the PMIO Maintenance Plan for the Coso Junction Planning 

Area and 

Certifying that the PMlO Redesignation Request and PMlO Maintenance 

Plan are exempt from CEQA requirements; 

B. 201 0 PMlO Maintenance Plan and Redesignation Request for the Coso 

Junction Planning Area (Attachment 2); 

C. Evidence of Compliance with California's procedural requirements: 

Notice of Exemption from CEQA (Attachment 3) and 

30-Day Notice of Public Hearing (Attachment 4); 

D. Evidence of Public Notice (Attachment 5); and 

E. Minutes from Public Hearing (Attachment 6). 

The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. 

For a list of simple ways you can reduce demand and cut your energy costs, see our website: htt~://www.arb.ca.aov. 

California Environmental Protection Agency 

Printed on Recycled Paper 
Mr. Jared Blumenfeld 

July 14, 201 0 

Page 2 

II. Public notice evidence and transcript for the ARB Public Meeting to Consider 

Approval of the Coso Junction Planning Area PM 10 Redesignation Request and 

Maintenance Plan. 

Ill. Resolution 10-25 adopting the Coso Junction Planning Area PMlO Redesignation 

Request and Maintenance Plan. 

IV. ARB Staff Report, Analysis of the Coso Junction PMl 0 Redesignation Request 

and Maintenance Plan. 

ARB is committed to working with U.S. EPA staff to provide any additional clarifying 

information you may need. If you have any questions, please contact Lynn Terry, 

Deputy Executive Officer, at (916) 322-2739, or Karen Magliano, Chief, Air Quality Data 

Branch, at (91 6) 322-71 37. 

I fxecutive Officer 

cc: (WIO Attachments) 

Mr. Theodore D. Schade 

Air Pollution Control Officer 

Great Basin Unified Air Pollution Control District 

157 Short Street 

Bishop, California 93514-3537 

Ms. Lynn Terry 

Deputy Executive Officer 

Air Resources Board 

Ms. Karen Magliano 

Planning and Technical Support Division 

Air Resources Board 
2010 PMIO Plan 

for the 

Great Basin Unified Air Pollution Control District 

District Submittal Package 
RESOLUTION 2010-01 

RESOLUTION OF THE GOVERNING BOARD OF THE 

GREAT BASIN UNIFIED AIR POLLUTION CONTROL DISTRICT 

ADOPTING THE 2010 PMIO MAINTENANCE PLAN AND 

REDESIGNATION REQUEST FOR THE COSO JUNCTION 

PLANNING AREA AND MAKING FINDINGS OF FACT 

WHEREAS, on August 6, 2002, the United States Environmental 

Protection Agency (USEPA) designated the Coso Junction Planning Area as a 

nonattainment area for the National Ambient Air Quality Standard for particulate 

matter of ten (10) microns or less in diameter (PMIO); and 

WHEREAS, the Coso Junction Planning Area for PM10 includes Rose , 

Valley, the Coso Geothermal Known Resource Area, and a portion of the China 

Lake Naval Air Weapons Station in southern lnyo County; and 

WHEREAS, the Great Basin Unified Air Pollution Control District, in 

accordance with the designation by USEPA of the Coso Junction Planning Area 

as a nonattainment area adopted the 2004 State Implementation Plan for the 

Coso Junction Planning Area; and 

WHEREAS, since adoption of the 2004 State Implementation Plan PMIO 

air quality has improved significantly in the Coso Junction Planning Area as a 

result of implementing dust control measures for windblown dust at Owens Lake, 

California, which is the major contributing source of PMIO to the Coso Junction 

Planning Area; and 

WHEREAS, PM10 concentrations measured in the Coso Junction 

Planning Area demonstrated compliance with the National Ambient Air Quality 

Standard for PMIO from 2006 through 2009; and 

WHEREAS, future compliance in the Coso Junction Planning Area will be 

ensured as a result of the implementation of dust control measures at Owens 

Lake, California through requirements contained in the PMIO State 

Implementation Plan for the Owens Valley Planning Area, approved by the 

USEPA in 1998 and as revised by the Great Basin Unified Air Pollution Control 

District and California Air Resources Board in 2003 and 2008; and 

WHEREAS, the 1990 federal Clean Air Act provides for the State of 

California. after reasonable notice and public hearings, to request that the 

USEPA redesignate the Coso Junction Planning Area to attainment with the 

National Ambient Air Quality Standard for PM10; and 

Resolrlt~on 2070-01 

May 17, 2010 

Page 1 of 3 
WHEREAS, a redesignation of the Coso Junction Planning Area to 

attainmentwith the National Ambient Air Quality Standard for PMIO requires a 

revis~on of the State Implementation Plan, which provides for the maintenance 

and enforcement of the PMIO standard in the Coso Junction Planning Area (also 

known as a maintenance plan); and 

WHEREAS, under California law, the Great Basin Unified Air Pollution 

Corltrol District is the governmental entity charged with the responsibility of 

developing and adopting such a maintenance plan for the Coso Junction PMIO 

Plann~t'lg Area, and with the timely submittal of such adopted plan to the 

California Air Resources Board; and 

WHEREAS, pursuant to the California Environmental Quality Act (CEQA), 

the 2010 PMIO Maintenance Plan and Redesignation Request for the Coso 

Junct~on Planning Area is exempt under §15061(b)(3) of the CEQA Guidelines; 

and 

WHEREAS, the Great Basin Unified Air Pollution Control District has 

developed and circulated for public review, and received and considered public 

comment upon the revised 201 0 PM10 Maintenance Plan and Redesignation 

Request for the Coso Junction Planning Area; and 

WHEREAS the 201 0 PM 10 Maintenance Plan and Redesignation 

Request for the Coso Junction Plannlng Area is now before this Governing Board 

for consideration of final adoption. 

NOW, THEREFORE, BE IT RESOLVED that following review by this 

Governing Board of the revised 2010 PMIO Maintenance Plan and 

Redesignation Request for the Coso Junction Planning Area, after cons~deration 

of written and oral public comments received on the proposed 201 0 PMI 0 

~aintenance Plan and Redesignation Request, this Governing Board hereby 

finds as follows: 

1. The major source contributing to the PMIO nonattainment 

problem in the Coso Junction Planning Area is windblown 

dust from the Owens Lake bed; 

2. PMIO monitoring demonstrated that the Coso Junction 

Planning Area has attained the National Ambient Air Quality 

Standard for PMI 0 as a result of control measures 

implemented at Owens Lake. 

Resolulion 2010-01 

May 17.2010 

Page 2 of 3 
3. The 1998 Owens Valley State Implementation Plan and 

revisions in 2003 and 2008 will ensure that compliance with 

National Ambient Air Quality Standard for PM10 is 

maintained in the Coso Junction Planning Area; 

BE IT FURTHER RESOLVED. that in consideration of each of the 

foregoing findings, statements and legal requirements, this Governing Board 

hereby approves and adopts the proposed 2010 PMIO Maintenance Plan for the 

Coso Junction Planning Area; and 

BE IT FURTHER RESOLVED, that the adopted State Implementation 

Plan for the Coso Junction Planning Area be forwarded for appropriate review to 

the California Air Resources Board with a request to redesignate the Coso 

Junction Planning Area to attainment with the National Ambient Air Quality 

Standard for PM10. 

APPROVED AND ADOPTED by the Governing Board of the Great Basin Unified 

Air Pollution Control District this 17th day of May, 2010, by the following vote: 

AYES, Board members - Sweeney, Arcularius, Veatch, Cervantes, Eastman, Hazard 

NOES: O 

ABSTAIN: 0 

ABSENT: Board members - McCarrol&)lfiunt f 

lQvhim 

Tom Sweeney, Boa 

ATTEST: 

, ( 1 

-#.{ -L.. ',-j\,c + .& &"f.. <-. 

Tori DeHaven, Clerk of the Board 

Resolution 201 C-01 

May 17. 20?0 

Paye 3 of 3 
Theodore D Scha:le 

Air P,i!ut~on Contr~i Gffice: 

GREAT BASIN UNIFIED AIR POLLUTION CONTROL DISTRICT 

157 Short Street, Rlshop, California 93514-3537 

760-872-8211 ]-'ax: 760-872-61 09 

BIO #I 0051 7-4c 

May 17, 201 0 

I HEREBY CERTIFY that at a regular meeting of the Great Basin Unified Air Pollution Control 

District Governing Board held in the Mono County Supervisors Chambers in Bridgeport, 

California on May 17, 2010 an order was duly made and entered as follows: 

AGENDA ITEM #4~: APPROVAL OF RESOLUTION 201 0-01 AND THE 201 O PMI O MAINTENANCE PLAN 

AND REDESIGNATION REQUEST FOR THE COSO JUNCTION PLANNING AREA 

A motion was made by Cervantes and seconded by Arcularius approving Board Resolution 

201 0-01, which 1) requests the US Environmental Protection Agency to redesignate the Coso 

Juntion Planning Area from nonattainment for the federal PMIO standard to attainment, 2) 

adopts the PM10 maintenance plan to ensure that compliance with the federal PMIO 

standard is maintained in the Coso Junction Planning Area. The Board than further directed 

the APCO to file a CEQA notice of exemption for this project. 

Ayes: Board Members - Arcularius, Hazard, Sweeney, Cervantes. Veatch, Eastman 

Noes: 0 

Abstain: 0 

Absent: Board Members - McCarroll, Hunt 

Motion carried 6/0 and so ordered 

I ATTEST: 

1 . :I I -I\ ( \ ILLL "+\, c :-4< , ..>*< , . 

Tor1 DeHaven, Clerk of the Board 
2010 PMlO Maintenance Plan and 

Redesignation Request for the 

Coso Junction Planning Area 

May 17,2010 

Prepared by: 

Great Basin Unified Air Pollution Control District 

2010 District Governing Board: 

Tom Sweeney, Alpine County, Chairman 

Linda Arcularius, Inyo County, Vice-Chairman 

Richard Cervantes, Inyo County 

Byng Hunt, Mono County 

D, "Hap" Hazard, Mono County 

Neil McCarroll, Town of Mammoth Lakes 

Henry "Skip" Veatch, Alpine County 

Authors: 

Duane Ono, Deputy Air Pollution Control Officer 

Ken Richmond, ENVIRON International Corp. 

Great Basin Unified Air. Pollution Control District 

Theodore Schade, Air Pollution Control Officer 

157 Short Street 

Bishop, California 935 14 

Tel: (760) 872-821, Fax: (760) 872-6109 

Website: www .gbuapcd.org 
Tllc authors gratefully acknowledge the excellent support from Mike Slates for providing 

maps, Phil1 Kiddoo and Chris Howard for analyzing the PMlO and meteorological data, 

Dan Johnson for data collection and photo documentation at Coso Junction, and Jonathan 

Bccknell for updating the emissions inventory for permitted facilities. 
2010 Coso Junction PMlO Maintenance Plan 

PMlO Maintenance Plan and Redesignation Request 

for the Coso Junction PMlO Planning Area 

EXECUTIVE SUMMARY 

This document is a revision to the 2004 PMlO State Implementation Plan (SIP) for the Coso 

Junction PMlO Planning Area. It includes 1) a request to redesignate the area from 

nonattainment for the National Ambient Air Quality Standard for PMlO (federal standard) to 

attainment based on monitoring data and a modeling analysis, and 2) a maintenance plan that 

contains requirements to ensure the federal PM10 standard will not be violated in the future. As 

required to redesignate the area to attainment, the enclosed monitoring data and modeling 

analysis show the Coso Junction Planning Area (CJPA) had less than or equal to 1.0 average 

annual exceedances of the federal PMlO standard (1 50 Clglm3 for a 24-hour average) during the 

3-year period from January 2007 through December 2009. 

The 2004 State Implementation Plan for the Coso Junction Planning Area examined the PMlO 

problem during the period from 1985 to 2003. During that period, 15 violations of the federal 

24-hour PM10 standard were monitored at the Coso Junction rest area on Highway US 395. 

Thirteen of those violations were found to have been caused by windblown dust from the dry 

lake bed of Owens Lake that is 14 miles outside (to the north) of the Coso Junction Planning 

Area. In November 2004, the District adopted a SIP for the CJPA to explain how the area would 

be brought into attainment. Since PMlO violations at Coso Junction were primarily caused by 

windblown dust from Owens Lake, the Coso Junction attainment demonstration relied on 

implementing dust controls outside of the planning area. Under the 2003 Owens Valley PMlO 

SIP, windblown dust from 29.8 square miles of the dry lake bed at Owens Lake were required to 

be controlled by December 2006. A dispersion modeling analysis showed these dust mitigation 

efforts would be adequate to bring the Coso Junction Planning Area into attainment. 

A review of daily ambient monitoring data from Coso Junction showed three monitored 

exceedances of the federal 24-hour PMlO standard (150 micrograms per cubic meter, 

during the 3-year period from January 2007 through December 2009. The federal 24-hour PMlO 

standard allows no more than an average of 1.0 expected exceedances per year over a 3-year 

period. Since daily PMlO monitor data showed the monitor site had an average of 1.0 

exceedances per year, PM 10 levels near the monitor site can be considered to be in attainment 

with the federal standard. 

A closer examination of the three exceedances found that two exceedances in 2007 (61512007, 

21 7 pg/m3; 121612007,283 were caused by windblown dust from an unpaved truck 

parking area west of the PM10 monitor site. The owner of the unpaved parking area was notified 

and the area was graveled in 2008 and surfaced with asphalt in 2009 to control fugitive dust. 

The third monitored exceedance (1 2/22/2009, 168 was caused by windblown dust from 

Owens Lake. During that event, dust source areas at Owens Lake that were not previously 

identified in the 2003 Owens Valley SIP contributed to the exceedance at Coso Junction. A 

revision to the Owens Valley SIP in 2008 included the majority of these dust source areas as part 

of a11 additional 9.8 square miles ofthe lake bed that was controlled using shallow flooding in 
2010 Coso Junction PMlO Maintenance Plan 

April 201 0. Another 3.5 square miles of the lake bed are expected to be controlled by October 

20 10. Therefore, dust control measures were implemented to mitigate the causes of dust for all 

three PM 10 exceedances at Coso Junction that took place during the 3-year attainment 

demonstration period. 

Although daily PM10 monitor data collected at the Coso Junction rest area showed the area 

could be considered to be in attainment with the federal standard, higher PM10 levels are likely 

to have occurred at locations closer to Owens Lake, since this is the primary source of 

windblown dust that caused Coso Junction to be designated nonattainment. The monitor site at 

the Coso Junction rest area is about 18 miles south of Owens Lake, while the northern boundary 

of thc CJPA is closer at 14 miles from Owens Lake. To determine if windblown dust from 

Owens Lake caused PM 10 violations at the northern boundary or at other locations in the CJPA, 

a dispersion model was run to analyze windblown dust impacts for the 3-year period from July 

2006 through June 2009. 

To evaluate attainment through a modeling analysis, the fourth highest value over a 3-year 

period must be below 150 Clg/m3 at all locations. The District used the CALPUFF dispersion 

model, which is a guideline model recommended by the United States Environmental Protection 

Agency (US EPA) for long-range transport and situations where complex winds influence 

dispersion. As expected, the CALPUFF model showed the highest PM 10 concentrations were at 

the northern boundary of the CJPA. The highest site had two days with modeled impacts above 

150 C1g/m3 and a third high concentration of 150 ~lg/rn~. Since 150 Clg/m3 is not an exceedance of 

the PMlO standard there were only two modeled exceedances at the highest receptor site in the 

CJPA. The fourth highest modeled value at the same site for the 3-year period was 137 Clg/m3. 

Therefore, the CALPUFF model analysis demonstrated it is reasonable to believe that attainment 

of the standard was achieved at all locations in the planning area. 

As a result of our evaluation of monitoring data and a CALPUFF modeling analysis, the District 

recom~nends through the adoption of this SIP revision that the California Air Resources Board 

request the US EPA redesignate the Coso Junction Planning Area from nonattainment to 

attainment for the federal PMlO standard. 

To ensure compliance with the federal PMlO standard is maintained in future years, the District 

evaluated future activities that could affect PM10 levels in the planning area and the adequacy of 

existing rules, policies and emission control requirements to control emissions from those 

sources and activities. District staff found that existing rules for fugitive dust and new source 

review were adequate to control potential new sources within the Coso Junction Planning Area. 

For PMlO sources outside the planning area, the major concern is for windblown dust from 

Owens Lake. District staff believes the control strategy and contingency requirements in the 

2008 Owens Valley PM 10 SIP are adequate to protect air quality in the Coso Junction area. 

'Therefore, no additional contingency measures will be needed to ensure future compliance with 

the federal PM10 standard in the Coso Junction Planning Area. 
2010 Coso Junction PMlO Maintenance Plan 

PMlO Maintenance Plan and Redesignation Request 

for the Coso Junction PMlO Planning Area 

Table of Contents 

Page 

Executive Summary 

Table of Contents 

Glossary 

1 

iii 

v 

Sections 

1 Planning Area 1 

2 Clean Air Act Regulatory History 1 

3 Air Quality 4 

4 Attainment Emissions Inventory 9 

4.1 Stationary Source Emissions 9 

4.2 Area Source Emissions 9 

4.3 Mobile Source Emissions 10 

4.4 Emissions Growth Forecast 10 

4.5 Wind Erosion from Sources Other than Owens Lake 11 

5 Control Strategy 11 

5.1 Contingency Measures 12 

5.2 Miscellaneous Sources and Model Background 15 

6 Air Quality Modeling and Attainment Demonstration 16 

6.1 Modeling Techniques 16 

6.2 Model Results 18 

7 Transportation Conformity 22 

8 General Conformity 

9 Request to Redesignate Coso Junction to Attainment 22 

10 Request to Approve Coso Junction PM 10 Maintenance Plan 23 

1 1 References 24 
2010 Coso Junction PMlO Maintenance Plan 

PMlO Maintenance Plan and Redesignation Request 

for the Coso Junction PMlO Planning Area 

Table of Contents 

Appendices 

A PM 10 Air Quality Data for Coso Junction, CA (1 985 - 2009) 

H PM I0 Concentrations and I-Iourly Meteorological Data for Exccedance Days 

Board Order #080 128-0 1 Requiring the City of Los Angeles to Undcrtake 

Measures to Control PMlO Enlissions from thc Dricd Bed oSOwcns Lake 

D Dispersion Modeling Results for Coso Junction PMlO Planning Area 

Figures 

Coso Junction PNI 1 0 Planning Area map 

Former Searles Valley PM 10 Planning Area map 

PM10 n~onitors in and ncar the Coso Junction Planning Area 

Emissions trend for Owens Lake emission reductions 

Photo of truck parking area west of Coso Junction PM10 monitor site 

CALI'UFF modeling domain 

4"' highest PM I0 model concentration from July 2006 through June 2009 

Map of 24-hour average PM 10 predictions for the design day 

Page 

2 

3 

5 

13 

15 

17 

20 

2 1 

Tables 

1 Summary of PM10 exceedances in the Coso Junction Planning Area 6 

2 Exceedances associated with windblown dust from Owens Lake 7 

3 Annual PMlO Concentrations in the Coso Junction Planning Area 8 

4 PM 10 emissions inventory for the Coso Junction Planning Area (2009-2025) 10 

5 Existing District Rules and Regulations for control sources of PM 1 0 14 

6 Summary of maximum PMl 0 model predictions 19 
201 0 Coso Junction PMIO Maintenance Plan 

GLOSSARY 

CALPUFF 

CARB 

CFR 

CH&SC 

CJPA 

CoGa 

CoJu 

District 

Dust ID Program 

Federal Standard 

GBUAPCD 

PMlO 

PSD 

SIP 

US EPA 

A USEPA recommended air quality model for long-range transport 

and situations where complex winds influence dispersion. 

California Air Resources Board 

Code of Federal Regulations 

California Health and Safety Code 

Coso Junction Planning Area 

Coso Gate model receptor site 

Coso Junction model receptor site 

Great Basin Unified Air Pollution Control District 

Owens Lake Dust Identification Program 

National Ambient Air Quality Standard 

(PM 10 = 150 vg/rn3 for a 24-hour average) 

Great Basin Unified Air Pollution Control District 

particulate matter less than 10 microns 

Prevention of Significant Deterioration 

State Implementation Plan 

United States Environmental Protection Agency 

kilometers 

meters per second 

miles per hour 

micrograms per cubic meter 
2010 Coso Junction PMlO Maintenance Plan 

BLANK PAGE 
2010 Coso Junction PMlO Maintenance Plan 

PMlO Maintenance Plan and Redesignation Request 

for the Coso Junction PMlO Planning Area 

1 Planning Area 

The Coso Junction PMlO Planning Area (CJPA) is located in Eastern California in the southern 

portion of Inyo County (Figure 1). It is an arid desert area that receives less than 5 inches of rain 

per year. The area is rural in nature and sparsely populated. The principle PM 10 monitor site is 

located at the Coso Junction rest area in the Rose Valley. This valley is flanked by the Sierra 

Nevada and Coso mountain ranges. The China Lake Naval Air Weapons Station, which covers 

most of the CJPA, is generally restricted from public access. 

Air pollution in the Coso Junction Planning Area is dominated by windblown dust transported 

from Owens Lake, which is located outside the planning area. Air pollution from District 

permitted facilities within the CJPA boundaries has generally not had a significant impact on 

PMlO concentrations in the planning area. These sources include the Coso geothermal power 

operations, military operations at the China Lake Naval Air Weapons Station, and volcanic 

cinder and pumice mining operations. Although generally not a problem in the planning area, 

high PM 10 readings were documented in 1990 due to windblown dust from abandoned 

agricultural land, in 2002 from a wildfire, and in 1990 from windblown dust from an unpaved 

truck parking area. None of these types of events are expected to recur at Coso Junction. The 

agricultural land just north of the monitor site was stabilized by natural vegetation cover in 1991 

after the land was fallowed. Since that time no agricultural activities have taken place in the 

CJPA. Dust from the unpaved truck parking area, located adjacent to the PM 10 monitor site 

was mitigated by covering it with gravel in 2008 and then asphalt pavement in 2009. 

2 Clean Air Act Regulatory History . 

The Coso Junction Planning Area was initially designated as a PMlO nonattainment area in 1987 

along with the Indian Wells Valley and Trona. Together they comprised the Searles Valley 

PMlO nonattainment area as shown in Figure 2. The Great Basin Unified Air Pollution Control 

District adopted a State Implementation Plan (SIP) for the Coso Junction portion of the Searles 

Valley PM10 nonattainment area in November 1991 (GBUAPCD, 1991). This was followed by 

air quality plans for the Indian Wells Valley and Trona, which were regulated by the Kern 

County Air Pollution Control District and the Mojave Desert Air Quality Management District 

(formerly San Bernardino County Air Pollution Control District). 

In August 2002, the United States Environmental Protection Agency (US EPA) redesignated the 

Searles Valley into three separate PMlO nonattainment areas. Under this regulatory action, Coso 

Junction and the Indian Wells Valley were classified as moderate PMlO nonattainment areas, 

and a finding of attainment was made for Trona. (Federal Register, 2002a, 2002b) In 2003, 

Indian Wells Valley was reclassified to attainment with US EPA's approvaI of the Moderate 

Area SIP and Maintenance SIP. (Federal Register, 2003a and 2003b) In November 2004, the 

Great Basin Unified Air Pollution Control District adopted a SIP revision for the Coso Junction 

PM 10 Planning Area that forecast compliance with the federal PMlO standard in 201 0. 
2010 Coso Junction PMIO Maintenance Plan 

Figure 1. The Coso Junction Planning Area is located in the southern portion of lnyo County, CA. 

Much of the planning area is covered by the China Lake Naval Air Weapons Station, which has 

restricted access for the general public. Most of the PMIO standard exceedances monitored at 

Coso Junction were caused by windblown dust from the exposed lake bed at Owens Lake. 
2010 Coso Junction PMlO Maintenance Plan 

Figure 2. The Searles Valley PMIO Nonattainment Area was reclassified into three separate 

planning areas in 2002. Indian Wells Valley and Trona were classified attainment for the federal 

PMlO standard in 2002 and 2003. 

The Coso Junction attainment demonstration was based on controlling dust from Owens Lake, 

which was scheduled to implement dust control measures on 29.8 square miles of the lake bed by 

December 3 1,2006. The 2004 Coso Junction SIP included a CALPUFF dispersion model 

analysis that indicated that after dust controls were implemented at Owens Lake at the end of 

2006, the Coso Junction Area would be in attainment. However, an additional 3 years of data 

collection and monitoring were needed to demonstrate the CJPA had attained the PMlO standard. 

This document is intended to provide the air quality monitoring data and modeling analysis to 

demonstrate the area has attained the PMlO standard. In addition, it includes regulatory 

requirements to ensure the CJPA will maintain compliance with the federal PMlO standard in the 

future. 
2010 Coso Junction PMlO Maintenance Plan 

3 Air Quality 

'fwcnty-two exceedances of the federal 24-hour PMlO standard were monitored at Coso Junction 

in the 24 years from 1985 to 2009. Eighteen out of 22 of these exceedances were caused by dust 

fro117 Owens Lake. High northerly winds and high PM10 concentrations near Owens Lake are 

good indicators for windblown dust to be transported from the exposed lake bed at Owens Lake 

to the CJPA. 

'1'0 docu~ncnthe Owens Lake dust impact at Coso Junction and other downwind sitcs, a specialpurpose monitoring network was operated from 1993 to 1996. Thc monitoring network shown 

in IYigurc 3 mcasurcd Owens Lake dust impacts at five downwind sitcs and found exceedanccs of 

the standard as far as 50 miles from Owens Lakc. PM I0 monitors at Coso Junction, Navy 1, and 

Pcarso~lvillc are within the CJPA boundaries. Sites north of Coso Junction are in the Owcns 

Valley PM 10 planning area and the monitor sites in Ridgecrest and Inyokern are in the Indian 

Wells PMlO planning area. 

Table 1 shows a summary of the PM 10 exceedances monitored in the CJPA and the levels 

measured at other sites in the network. Table 2 shows PM10 concentrations, wind speed and 

directions in the Owens Lake area for these exceedance days. As previously mentioned, 18 of 

the 22 exceedances in the CJPA were caused by dust from Owens Lake. The exceptions to this 

are four events measured at Coso Junction on 4/23/90, 7/25/02, 6/5/07, and 12/6/07. 

The event on 4/23/90 was caused by windblown dust from abandoned agricultural land 

located upwind from the monitor site. In 1991, this agricultural field naturally revegetated after heavy March rains. Since that time, the field has remained covered with 

volunteer vegetation and has not been observed as a dust source area. (GBUAPCD, 1991) 

The event on 7/25/02 was caused by smoke from the McNally wildfire in the Sierra about 

20 miles west of the planning area. About 150,000 acres of mixed conifer, heavy brush 

and grass burned from July 2 1 to August 29, 2002. (Wilderness Society, 2003) 

Two events on 6/5/07 and 12/6/07 were caused by windblown dust from an unpaved 

truck parking area west of the PM10 monitor site. The truck stop owner was notified and 

the parking area was surfaced with gravel in 2008 and recycled asphalt in 2009. 

Table 3 shows the number of monitored exceedances per year, and the expected number of 

exceedances per year based on the monitoring frequency. Prior to 2006, samples were normally 

collected on a once every sixth-day, or once every third-day schedule. In 2006, daily PMlO 

monitoring was initiated at Coso Junction. Table 3 also includes the 3-year annual average 

PMlO concentrations for Coso Junction, which in 2009 was 19 Clg/m3. However, it should be 

noted that the US EPA revoked the annual PMlO standard in 2006, which at the time was set at 

50 Clg/rn3. A complete list of PM10 monitor data for Coso Junction and other nearby sites is 

included in Appendix A, and hourly data for the 22 exceedances is summarized in Appendix B. 
2010 Coso Junction PMlO Maintenance Plan 

Figure 3. PMlO monitor locations in and near the Coso Junction Planning Area. 

,Rj PMlO Sites iv Lone Pine 

I 

Owens 

ex\ ,' . " - - / 

-- / 

Vb, 

Dirty Socks - I 

Olancha 

R ' Coso Junction 

t Navy I \ 

\ 

\ 

\ 

- I 

I 

! 

t 

\ 

I 

\ 

I 

I 

I 

#q Pearsonville 

I 

I 

1 

1 

I 

I 

t ". 

_--- 

Y 

\ 

0 5 10 15 Miles 

1 J 
2010 Coso Junction PMIO Maintenance Plan 

Table I. Summary of PMIO exceedances monitored over 150 pglm3 in the Coso Junction Planning 

Area and concentrations at other sites on the same day. See Table 2 for causes of exceedances 

in the CJPA for the dates shown below and Appendix B for hourly meteorological data for these 

events. 
2010 Coso Junction PMlO Maintenance Plan 

Table 2. Over the last 25 years, violations of the federal PMIO standard in the Coso Junction 

Planning Area were primarily caused by dust from the Owens Lake area. See Table 1 for PMIO 

concentrations on the dates shown below and Appendix B for hourly meteorological data for 

these events. 

Exceedance 

Date 

412511 985 - 

41211 986 

6/7/1986 

Max Speed 

MPH @ 10 m 

30.0 

111 511 987 

21311989 

1 I212311993 1 25.7 1 35 1 N wind all day. Owens Lake Dust 1 

37.5 

27.5 

412311 990 

1012611993 

Direction of 

Max Wind 

Degrees 

335 

40.0 

38.0 

1 41811995 1 23.2 1 31 6 1 COSO Junction Met, Owens Lake Dust 1 

Primary Cause of Exceedance 

N wind all day, Owens Lake Dust, Coso Met 

350 

26.0 

29.3 

I I I 

-- 

41911 995 / COSO Junction Met, Owens Lake Dust I 

N wind all day, Owens Lake Dust 

35 

285 

1 412111995 1 29.2 / 7 / N wind all day. Owens Lake Dust 1 

31 5 Variable winds during day, Owens Lake 

I Dust 

N wind all day, Owens Lake Dust 

Variable winds during day, Owens Lake 

Dust 1 

272 

18 . 

1/5/1994 

- 

38 1 N wind all day. Owens Lake Dust I 

Abandoned Ag Land Dust 

N wind all day, Owens Lake Dust 

31 .O 22 

1 5/23/1996 1 30.7 1 5 1 N wind all day. Owens Lake Dust 1 

Variable winds during day, Owens Lake 

Dust 

31611 998 

311 811 998 

1 I21612007 1 42.6 1 252 1 W wind. Coso Junction Parking Area Dust 1 

34.9 

--- 

12.0 

1 7/25/2002 17.6 

1 I212812006 

6/5/2007 

354 Variable winds during day, Owens Lake 

Dust 

48 Variable winds during day, Owens Lake 

Dust 

163 

1 2/2/2003 

McNally Fire smoke 

36.2 

46.8 

36.2 

1 I212212009 1 39.1 

3 1 N wind all day. Owens Lake Dust 

337 1 N wind all day, Owens Lake Dust 

1 

264 

N wind, Regional and Owens Lake Dust 

W wind, Coso Junction Parking Area Dust 
2010 Coso Junction PM10 Maintenance Plan 

Table 3. The expected number of exceedances per year has decreased since dust control 

measures were implemented on 29.8 square miles of the Owens Lake bed in December 2006. 

PMI 0 Concentration (pglm3) Number 

Average Average 24-Hour Exceeds Per Year I Year 

1 1985 1 Invalid 307 1 49 

1992 

1993 

1994 

1995 

1996 

1997 

Invalid 

28.78 

16.69 

32.28 

Invalid 

Invalid 

38 

25.92 

0 36 

388 

692 

309 

92 

2 54 59 

1 

2 

1 

0 

2 12 

6 

12 

61 

58 

51 

54 
2010 Coso Junction PM10 Maintenance Plan 

More information on the Coso Junction PMlO monitor site is included in the District's annual 

Ambient Air Monitoring Network Plan, which was approved by the US EPA. (GBUAPCD, 

2009a) As a commitment in the maintenance plan for the CJPA the District is authorized to 

continue daily PMlO monitoring at the Coso Junction rest area to ensure new and existing 

sources of PM 10 are identified and control led, if necessary. (CH&SC $4000 1) 

4 Attainment Emissions Inventory 

The attainment emissions inventory for the CJPA is based on estimated daily PM10 emissions 

for 2008. Emission estimates for 2008 are typical of emissions in the CJPA over the 3-year 

period (2007-09) when PMlO compliance was determined from monitoring and modeling 

evaluations. PMlO emissions generated in the CJPA are primarily from permitted facilities on 

the China Lake Naval Air Weapons Station property, which is generally restricted from public 

access. Table 4 shows the daily PM10 emissions inventory for permitted facilities in the CJPA 

and for area and mobile sources. Total PM 10 emissions are estimated at 1,478 pounds per day. 

In comparison, total daily PMlO emissions generated in the CJPA are less than 0.1% of the 

emissions caused by windblown dust from Owens Lake, which is the primary cause of PM10 

violations at Coso Junction. PMlO emissions from Owens Lake wereestimated at 1.55 million 

pounds for the CJPA design day (January 5,2007). 

4.1 Stationary Source Emissions 

The point source emission estimates shown in Table 4 were developed from information 

contained in current District and federal Title V permit files. Unpaved road and haul road 

emissions for permitted sources are included in the daily emissions for each facility. Emissions 

were based on 10-hour workdays for the pumice and rock plants. 

4.2 Area Source Emissions 

Unpaved road dust emissions in the area source category are estimated for non-permitted facility 

related traffic. An estimate of PMlO emissions from reentrained road dust from unpaved roads is 

based on the method found in US EPA's Compilation ofAir Pollution Emission Factors, AP-42 

(USEPA, 2006). 

Eq. 1 

Where: E = PMlO emissions in pound per vehicle mile traveled 

s = silt content of road surface material (5%) 

S = mean vehicle speed (30 miles per hour) 

M = surface material moisture content (assume 0.3%) 

C = emission factor for 1980's vehicle fleet exhaust, brake wear and tire wear 

(0.00047 for PMI 0). 

For PMlO from public unpaved roads: k = 1.8, a = 1, d = 0.5 and c = 0.2. 
2010 Coso Junction PMlO Maintenance Plan 

Table 4. Daily PMlO emissions inventory for the Coso Junction Planning Area for 2008 through 

2025. For the purpose of the maintenance plan, no significant growth is expected in the 

emissions inventory through the year 2025. 

(~aily PMlO Emissions for 2008 through 2025 

1 Stationary Sources 1 Poundsldav 1 

1 California Lightweight Pumice 1 167 i 

China Lake Naval Air Weapons Station 

Coso Operating Company 

Halliburton Services 

Twin Mountain Rock 

1 Mobile Sources 1 1 

1 Total PMlO (~ounds ~er dad 1 1.478 1 

On-Road Motor Vehicles 

Equation 1 yields an emission rate of 0.83 pounds of PM10 per vehicle mile traveled. Assunling 

an average of 2 vehicle trips per day on 50 miles of unpaved roads in the public portion of the 

CJPA, yields 100 vehicle-miles per day and 83 pounds of PMlO per day. (CARB, 20 10a) 

12 

PMlO from paved road dust is based on CARB's emission estimates for Inyo County in 2008 

(0.99 tons of PM 1 0 per day) and pro-rated for the proportion of traffic in the CJPA (5.1 %), 

which yields 101 pounds per day. (CARB, 20 lob) 

Based on population growth in Inyo County, area source emissions are not expected to change 

significantly in future years. 

4.3 Mobile Source Emissions 

PM 10 from on-road motor vehicle emissions (excludes re-entrained road dust) is based on 

CARB's emission estimates for lnyo County in 2008 (0.12 tons of PMIO per day) and pro-rated 

for the proportion oftraffic in the CJPA (5.1%), which yields 12 pounds per day. (CARB, 2010) 

The mobile source emissions are not expected to change in future years. 

4.4 Emissions Growth Forecast 

Due to the sparse population, lack of population growth, and the expectation that industrial 

operations in the planning area will not change significantly, the emissions inventory forecast 

will remain stable for all future years. The 2000 US census shows 102 people living in the Coso 

Junction Planning area in the communities of Pearsonville and klomewood Canyon. This is 

about 0.5% of the total population of Inyo County. According to the US Census Bureau, Inyo 

County's population declined from 18,28 1 in 1990 to 17,945 in 2000. Population continued to 
2010 Coso Junction PMIO Maintenance Plan 

decline to 17,136 in 2008. Over those 18 years, Inyo County's population decreased by 4.5%. 

(US Census Bureau, 20 10) 

For the purpose of the emissions forecast for the maintenance plan, the daily PM10 emissions 

inventory will be the same as shown in Table 4 for the next 17 years through the year 2025. 

4.5 Wind Erosion from Sources Other than Owens Lake 

Undisturbed open areas in the CJPA are generally invulnerable to significant wind erosion. 

Ambient monitors show low PM10 concentrations (23 vg/m3) on windy days when winds are not 

from the direction of Owens Lake or other known windblown dust source areas (see section 5.2). 

Two known windblown dust source areas in the CJPA, however were found to be significant. 

In 1990 and 2007, three exceedances of the federal PMlO standard were monitored at Coso 

Junction, which were caused by windblown dust from a fallow agricultural field and an unpaved 

truck parking area (see Table 2). As noted in the air quality discussion, these areas are no longer 

a dust problem since the agricultural field is protected by volunteer vegetation cover and the 

truck parking area is now paved. Since these areas are no longer a significant source of dust, 

they are not included in the daily PMlO emissions in Table 4 for the years 2008 through 2025. 

However, PM 10 emissions from these source areas can be estimated for each of the event days in 

1990 and 2007. 

A wind tunnel-based emissions algorithm was developed for the 1998 Owens Valley PMlO SIP, 

which can be used to estimate PMlO emissions from the agricultural field , public unpaved 

roadways and the unpaved truck parking area. The Owens Lake emissions equation for the fall 

period (equation 2) provides a good estimate for wind erosion in the CJPA since the surfaces can 

be considered to be disturbed, but they lack the efflorescent salts that characterize the lake bed 

surface at Owens Lake in the spring. (E = 0 in equation 2 for u 5 7.6 m/s) (GBUAPCD, 1998) 

E = 1.34 x 10-5 e(0.25X~) Eq. 2 

Where: E = PMlO emissions in grams per square meter per second 

u = Hourly average wind speed at 10 m in meters per second (for u > 7.6 m/s) 

Appendix B includes meteorological data for these three wind events. The agricultural field 

covered 3 14.5 acres on 412311 990, and the PMlO emissions on that day are estimated at 12,566 

pounds. Wind erosion from the unpaved truck parking area (4.7 acres) is estimated at 55 1 

pounds on 6/5/2007 and 763 pounds on 12/6/2007. Wind erosion from unpaved roadways in the 

CJPA (46.8 acres) is estimated at 5,489 pounds on 6/5/2007 and 7,611 pounds on 12/6/2007. 

5 Control Strategy 

As discussed in the Air Quality section of this document, PM10 exceedances in the CJPA are 

primarily due to the transport of windblown dust from the Owens Lake area. Therefore, 

achieving emission reductions at Owens Lake is the primary control strategy for reaching 

attainment in the CJPA. The US EPA classified the southern Owens Valley as a serious PMlO 
2010 Coso Junction PMlO Maintenance Plan 

nonattainment area in 1993 and required a SIP be developed to achieve compliance with the 

federal standard. A SIP was adopted in 1998 and approved by the US EPA for the Owens Valley 

with an interim control strategy that required dust controls on 16.5 square miles ofthe lakebed. 

Under the Owens Valley SIP, the City of Los Angeles is responsible for mitigating the dust 

generated from Owens Lake in order to bring the area into attainment with the federal standard. 

(CI3UAPCD, 1998) The Owens Valley SIP was revised in 2003 to expand dust controls to 29.8 

square miles of the lake bed by December 3 1,2006. (GBUAPCD, 2003) The City of Los 

Angeles successfully implemented these control measures by the required deadline. Another 

revision to the Owens Valley SIP in 2008 expanded control requirements to a total of 43.1 square 

miles of the Owens Lake bed. The Board Order to implement control measures in the 2008 SIP 

is included as Appendix C of this document. Tlic City of Los Angcles is expected to havc dust 

control measurcs i~nplementcd on 39.6 square ~nilcs ofthe lakebed by April 1, 2010, and then to 

expand the control area to 43.1 square miles by October I, 201 0. (CBUAPCD, 2008; 

GBUAPCD, 2009b) 

Figure 4 shows the annual PMlO emissions trend for the Owens Valley planning area. The blue 

line represents total PMlO emissions from all sources in the planning area, and the red line 

rcpresents the windblown dust emissions from the Owens Lake bed. The dashed lines represent 

emission forecasts for Owens Lake based on the implementation of additional control measures 

on the lake bed and in the Keeler Dunes. Actual PM I0 emissions from the Owens Lake bed 

have been reduced by 90% since 2000 when the City of Los Angeles initiated efforts to control 

windblown dust at Owens Lake. Windblown dust emissions were estimated using hourly PM10 

emission measurements collected through the Owens Lake Dust Identification Program. Hourly 

data on windblown dust was collected from 2000 through 2008 using the methodology described 

in the Owens Valley PM10 SIP. (GBUAPCD, 2008) The decrease in windblown dust emissions 

from Owens Lake after 2006 is reflected in the reduction in Owens Lake-caused PMlO 

exceedances monitored at Coso Junction in 2007,2008 and 2009 (Table 3). The additional 2008 

Owens Valley SIP control measures, which will be implemented in 201 0 should result in even 

lower PM10 levels at Coso Junction than those observed during this 3-year period. 

Other sources of PM10 that caused exceedances of the federal standard at Coso Junction 

included; a wildfire and windblown dust from agricultural operation and from an unpaved truck 

parking area. These-events were discussed in the Air Quality section of this document. Current 

District rules are adequate to prevent agricultural operations, prescribed burning, and windblown 

dust from disturbed surface areas from causing exceedances of the standard in the future. Table 

5 shows the current District rules that limit PM 10 emissions in the planning area. 

5.1 Contingency Measures 

The Owens Valley SIP also includes contingency measures (referred to as Supplemental Control 

Requirements in the Owens Valley SIP) that require the City of Los Angeles to implement dust 

control measures on any new windblown dust areas on the lakebed and to improve dust control 

measures in areas where it is necessary to prevent exceedances of the PMlO standard at any 

location on the shoreline of Owens Lake (see Appendix C, Board Order #080128-01 Requiring 

the City of Los Angeles to Undertake Measures to Control PMI 0 Emissions from the Dried Bed 

of Owens Lake). The District will rely on all the PMlO control measures and the Supplemental 

Control Requirements in the Owens Valley SIP, and existing District rules to ensure compliance 
2010 Coso Junction PMlO Maintenance Plan 

Figure 4. Since 2000, actual PMlO emissions from the exposed lakebed at Owens Lake have 

decreased by 90% as a result of dust control measures implemented by the City of Los Angeles. 

PMlO emissions will decrease in 2011 after additional dust controls are implemented on 13.3 

square miles of the lake bed. This will bring the total to 43.1 square miles of dust control areas. 

-t-- lakabad Ernlsslonr 

is maintained in the CJPA. The Board Order in Appendix C includes all the Owens Lake control 

measures and the Supplemental Control Requirements, which the District will rely on to prevent 

Owens Lake dust from causing future violations in the CJPA. (GBUAPCD, 2008) 

The District is authorized to continue daily ambient PMlO monitoring at Coso Junction (CH&SC 

9 40001). If an exceedance of the federal PMlO standard is monitored the District will 

investigate the cause of the exceedance within 60 days following the end of the calendar quarter 

during which the event occurred. Exceedances found to be caused by dust from Owens Lake 

will be investigated to determine if the required control measures were properly implemented in 

accordance with Board Order #080128-01. Exceedances found to be caused by dust from local 

sources that are subject to current District regulations will be addressed and corrected. 

Exceedances found to be caused by Exceptional Events, such as wildfires or earthquakes will be 

flagged in accordance with US EPA policy (Federal Register, 2007). 

To prevent new facilities from causing an air pollution problem, any new facilities in the CJPA 

that may emit air pollution will be subject to the District's new source review rules (209-A, 216 

and 2 16-A). Facilities that qualify as a major source under the US EPA federal permitting 

guidelines will also be subject to federal PSD (Prevention of Significant Deterioration) 

permitting requirements (40 CFR 5 1.166 and 52.21). 
201 0 Coso Junction PM10 Maintenance Plan 

Table 5. Existing District rules and regulations to control sources of PM10. 

Description 

209-A 

21 

Requires new sources with PMlO emissions greater than 250 pounds per day of total 

suspended particulates, or facility modifications of greater than 15 tons per year of 

PM 10 to apply Best Available Control Technology to control PM eniissions. 

Requires the Air Pollution Control Officer to evaluate air pollution impacts before 

issuing an Authority to Construct or Permit to Opcrate for a new facility, 

216-A 

40 8 I Limits agricultural burning operations to designated burn days and requires a burn 

permit. 

I<cquires permits for any new secondary source of air pollution including buildings, 

commercial parking and housing developments. 

Limits visible emissions from any source, except those exempted under Rule 405, to 

40 

409 1 Limits range improvement burning to designated burn days and requires a burn plan 

be approved by the Air Pollution Control Officer. 

400 I less than Ringelmann 1 or 20% opacity. 

Requires reasonable precautions be taken to prevent visible particulate emissions from 

crossing the property boundary. 

410 1 Limits forest management burning lo designated burn days and requires a burn plan be 

aoproved by the Air Pollution Control Officer. 

Prohibits sources of air pollution from causing a nuisance to the public or endangering 

402 public health and safety. 

Limits wildland management burning to designated burn days and requires a burn plan 

be approved by the Air Pollution Control Officer. 

502 1 Requires conservation management plans to reduce fugitive dust emissions from 

agricultural operations greater than 10 acres in Inyo, Mono and Alpine Counties 

Requires that federal actions and federally funded transportation-related projects 

Reg. XI1 conform to SIP rules and that they do not interfere with efforts to attain federal air 

quality standards. 

Requires that federal actions and federally funded projects conform to SIP rules and 

Reg I that they do not interfere with efforts to attain federal air quality standards. Federal 

actions that have the potential to emit more than 100 tons per year of PM10 in the 

CJPA will be required to complete a conformity determination. 
2010 Coso Junction PMIO Maintenance Plan 

Figure 5. Windblown dust from this truck parking area located west of the PMIO monitor site at 

the Coso Junction rest area caused two exceedances of the PMIO standard in 2007. The parking 

area was graveled in 2008 to control dust. In 2009, most of it was paved and used as a staging 

area for a highway construction project. 'The PMIO monitor site is the structure with the railing on 

top in the center of the photo. Coso Junction wind measurements are taken at a 10 m height on 

the tower to the left (north) of the PMIO monitor. (View looking to the northeast, February 24, 2010) 

5.2 Miscellaneous Sources and Model Background 

To determine the PMlO contribution from miscellaneous sources other than Owens Lake on days 

with Owens Lake dust events, the District reviewed the hourly PMlO data from the Coso 

Junction monitor site. By looking at hours with high winds (>7 mls, 16 mph) and screening out 

wind directions from Owens Lake and the unpaved parking area located to the west of the 

monitor, the average PMlO concentration at Coso Junction was determined to be 23 pg/m3 on 

windy days. This is close to the average background concentration of 20 pg/m3 that was 

determined for sites in the Owens Valley Planning Area. If the unpaved parking area had been 

included in the wind direction screening, the average PMlO concentration for high wind hours 

would have been 40 pg/m3. However, since this source has already been adequately controlled 

by gravel and asphalt pavement it will not be treated in the model attainment demonstration. 

Figure 5 shows a photo taken on February 24, 2010 of the paved truck parking area located west 

of the Coso Junction PMlO monitor site. To account for sources other than windblown dust 

from Owens Lake in the attainment demonstration a background concentration of 20 pg/m3 was 

added to all 24-hour model predictions. 
2010 Coso Junction PMlO Maintenance Plan 

6 Air Quality Modeling and Attainment Demonstration 

Since 18 of the 22 PM10 violations monitored at Coso Junction were found to have been caused 

by windblown dust from the Owens Lake bed, the Owens Valley PMlO model was used to 

model the attainment demonstration for the Coso Junction PM 10 redesignation request and 

maintenance plan. It should be noted the four non-Owens Lake-caused exceedances, were 

caused by: windblown dust from a fallow agricultural field, which is now stabilized with 

volunteer vegetation; an unpaved truck parking area, which has since been paved and graveled; 

and a wildfire in 2002. The air quality modeling study was not intended to simulate these types 

of non-recurrent events. 

Dispersion modeling was performed to estimate PM10 concentrations during high wind events 

along the southern boundary ofthe Owens Valley PM10 Planning Area, which is the northern 

boundary of the CJPA. Dust source areas at Owens Lake were simulated using the methods 

described in the Owens Valley PMl0 Planning Area 2003 and 2008 State Implementation Plan 

revisions (GBUAPCD, 2003; GBUAPCD, 2008). Based on the sand flux and meteorological 

data collected during July 2006 to June 2009, the simulations suggest PMlO concentrations from 

dust source areas on Owens Lake will not cause violations of the federal PM10 standard in the 

neighboring Coso Junction PM 10 planning area. 

6.1 Modeling Techniques 

Dispersion model simulations were performed with the regulatory version 5.8 of the CALPUFF 

modeling system following the techniques of the Owens Lake Dust ID Program summarized in 

the 2003 and 2008 Owen Valley SIPS. The data collected by the Owens Lake Dust ID Program 

include surface meteorological data (at 10 m height), upper air meteorological soundings, source 

area delineations, and horizontal sand flux observations. Sand flux measurements are used as the 

basis for PMlo emission rates from windblown sources on Owens dry lakebed. Full details on 

the modeling protocol for this study can be found in District Board Order #080128-01, 

Attachment C, Section 6.0 (included as Appendix C of this document). Some of the features of 

the Coso Junction CALPUFF model simulation were: 

Model simulation period was from July 2006 to June 2009 using the last three years of 

data available from the Owens Lake Dust ID Program. 

The Owens Valley study domain was extended to the south to include the common 

boundary of the southern Owens Valley and northern Coso Junction PMIO planning 

areas. The revised modeling domain is depicted in Figure 6. The revised study domain is 

36 km-by-67 km versus the Owens Valley domain of 34 km-by-48 km. 

The same vertical and horizontal mesh sizes are used in both modeling analyses. 

Data collected at two additional surface meteorological stations in the southern portions 

of the current domain were used to construct the wind fields for the simulations. Data 

from the Coso Junction (CoJu) and Coso Gate (CoGa) sites shown in Figure 6 were 

prepared using the same methods as described in the Owens Valley PMlO SIP. 
2010 Coso Junction PMIO Maintenance Plan 

Figure 6. The dispersion modeling domain for the Owens Valley and Coso Junction Planning 

Areas was 36 km by 67 km. 

USGS 

Land Use 

Salt Flat/Sand/Barren 

Wetland 

Water 

Forest 

Range 

Agriculture 

Mixed urban 

@ Met. Site 

TEOM 

UTM East-West (h) 
2010 Coso Junction PM10 Maintenance Plan 

To assess attainment, PMlO concentration predictions were obtained at 90 receptors 

placed along the southern Owens Valley PMlO Planning Area boundary. 'Phe receptor 

interval shown in Figure 6 is 300-600 m. A receptor was also placed at the Coso Junction 

site where current and historical PM 10 observations arelhave been collected. 

Area source PMlO emission fluxes were calculated using hourly Sensit sand motion data 

and seasonal proportionality constants (K-factors) for July 2006 to June 2009. The 

procedures used to derive the seasonal 75th percentile K-factors are described in the 2003 

and 2008 Owens Valley PMlO SIPS. 

Twelve different area source configurations were available from the Owens Lake Dust ID 

Program based on source delineations for the three-year period. 

No additional controls were assumed for the Owens Lake sources. Sources were 

characterized as observed during the simulation period without the effects of controls 

planned for many of these areas. 

As in the 2003 and 2008 Owens Valley SIP attainment demonstrations, the current 

simulations only include windblown emissions from sources on the lakebed and the 

Keeler Dunes. As discussed in the previous section, in order to account for background 

and miscellaneous sources, model predictions were added to a background concentration 

of 20 pg/m3. This same background concentration is also included in the modeling 

protocol for the Owens Valley SIP (GBUAPCD, 2003; GBUAPCD, 2008). 

Attainment for the 24-hour PM 10 NAAQS was assessed using the fourth highest daily 

prediction at the same receptor during the three-year simulation. 

Appendix D of this document provides a summary of the model results. It also includes an 

evaluation of model performance comparing predictions and observations for 10 monitor sites in 

the Owens Valley and Coso Junction planning areas. The model performance results suggest 

model predictions as a whole are relatively unbiased, but scattered, and that the predicted 

frequency distributions are generally within a factor-of-two of the observed distribution. 

6.2 Model Results 

Table 6 summarizes the results for the CALPUFF simulations of Owens Lake dust events during 

July 2006 through June 2009, conservatively assuming no future controls would reduce 

emissions. Figure 7 shows predicted 24-hour design concentrations at the common planning area 

boundary. The design concentration is the 4th highest 24-hour prediction in the three-year 

simulation. lf the design concentration is under the federal standard of 150 pg/m3, then that 

location is in attainment with the standard. The modeling resuIts show the highest design 

concentration including background at the boundary of the CJPA is 137 pg/m3. 
2010 Coso Junction PMlO Maintenance Plan 

Table 6. Summary of maximum PMlO model predictions in the Coso Junction Planning Area for 

the period from July 2006 through June 2009. The design concentration is the 4'h highest 24-hour 

prediction in the three-year simulation at the same location, in this case it is 137 pglm3. 

As would be expected, the highest 24-hour PMlO concentration occurred at the boundary ofthe 

Owens Valley and Coso Junction planning areas near the valley floor and along the west side of 

the valley. The model showed PMlO concentrations decreasing at distances further fiom Owens 

Lake. The added distance to the southern boundary of the Owens Valley Planning Area and 

associated greater dilution of dust source plumes, produces much lower predictions than for 

receptors placed along the Owens Lake shoreline. Figure 8 shows that 24-hour average PMlO 

concentrations for the model design day for Coso Junction (January 5, 2007) decreased at 

locations further fiom Owens Lake. 

The dust sources on the Owens Lake bed were simulated as ground level area sources located 

inside the historical shoreline. The CALPUFF modeling system assumes passive, non-buoyant 

ground based sources remain ground based as they travel downwind and concentrations within 

individual dust plumes always decrease with downwind distance. Stagnation and re-circulation 

of dust source plumes that might result in pockets of higher concentrations at fixed downwind 

receptor locations generally do not occur concurrently with the regional high wind events that are 

necessary to produce emissions on the lakebed. When only emissions from lakebed sources are 

considered, attainment ofthe PM10 standard at the northern boundary of the CJPA is sufficient 

to demonstrate attainment within the entire planning area. 
2010 Coso Junction PMIO Maintenance Plan 

Figure 7. The predicted 4th highest 24-hour PMIO concentration over 3 years for receptors on 

the northern boundary of the CJPA are shown on the map below. Every 4th receptor 

concentration is plotted on the map. The 3-year modeling period is from July 2006 through 

June 2009. 

1 I 1\11 I,~II 1111 I 71 11 I 11 71 

400 405 410 415 420 425 430 

UTM East-West (km) 
2010 Coso Junction PMIO Maintenance Plan 

Figure 8. This isopleth map shows model concentrations for the 4th highest day in the CJPA over 

the 3-year modeling period (January 5, 2007). Modeled 24-hour average PMIO concentrations are 

below the federal standard of 150 pglm3 at all locations in the CJPA. 

IJ7fM fiat - Wcst (krn) 
2010 Coso Junction PMIO Maintenance Plan 

It should be noted the current analysis used estimates of windblown emissions during July 2006 

through June 2009-future emissions will be substantially lower. The model simulations for the 

attainment demonstration did not account for controls currently planned on many of these source 

areas that will be implemented in the future. If planned controls, such as the 13.3 square miles 

that will be completed in October 2010 were considered in the modeling analysis, predicted 

concentrations would be much lower than suggested by the current simulations. 

7 Transportation Conformity 

'I'l+ansportation conformity requirements contained in District Regulation XI1 requirc that federal 

actions and federally funded transportation pl.ojects conform to SIP rules and that they do not 

interfere with efforts to attain federal air quality stands. Transportation sources wcrc 1101 found 

to contribute to the nonattainment problem at Coso Junction and PM10 from paved roads. 

Estimated at 1 13 pounds per day, paved road emissions comprise less than 10% of the daily 

PM 10 emissions in the CJPA (see Table 4), and less than 11100'~ of a percent of the Owens Lake 

dust emissions on the design day (1.55 million pounds on January 5, 2007). Due to their benign 

role in the PM10 problem in the CJPA, transportation-related projects such as road construclion 

will be exempt from Transportation Conformity determination requirements under District 

Regulation XII. 

8 General Conformity 

General conformity requirements contained in District Regulation XI11 require that fcderal 

actions and federally funded projects conform to SIP rules and that they do not interfere with 

efforts to attain federal air quality standards. A conformity determination is currently required 

for any federally hnded (non-transportation) project or action that takes place in a moderate 

PM 10 nonattainment area, including the CJPA that has the potential to exceed a de minimfs 

PM 10 emissions threshold of 100 tons per year. In order to maintain the stringency of control 

requirements in the CJPA under a maintenance plan, the District will retain the 100 tons of 

PM 10 per year de minimis emissions threshold for triggering a conformity determination as 

currently required under District Regulation XIII. 

9 Request to Redesignate Coso Junction to Attainment 

Through this document the District demonstrated that, over the 3-year period from January 2007 

through December 2009, the Coso Junction area attained the federal 24-hour standard for PM 10. 

Daily PMlO monitoring data collected at Coso Junction over the last 3 years has not shown more 

than 1.0 exceedances of the PM 10 standard per year as required to demonstrate attainment of the 

federal standard. In addition, a dispersion modeling analysis was performed for a 3-year period 

to demonstrate no more than 1.0 exceedances of the PMIO standard could be expected at any 

location in the Coso Junction Planning Area. The District believes the Coso Junctio~l PM10 

Planning Area has attained the federal PM10 standard and requests the California Air Resources 

Board recommend to the US Environmental Protection Agency that the area be redesignated 

from nonattainment to attainment wit-h the federal PM10 standard. 
2010 Coso Junction PMlO Maintenance Plan 

10 Request to Approve Coso Junction PMlO Maintenance Plan 

To ensure that compliance with the federal PM10 standard is maintained in future years, the 

District evaluated future activities that could affect PMlO levels in the planning area and the 

adequacy of existing rules, policies and emission control requirements to control emissions from 

those sources and activities. District staff found that existing rules for fugitive dust, new source 

review and General Conformity were adequate to control potential new sources within the Coso 

Junction Planning Area. 

Emissions from PMlO sources in the CJPA decreased over the last 18 years due to a drop in local 

population and the closing of one of the permitted facilities. Emission sources in the CJPA are 

not expected to increase in the future, but it is more likely that they will either remain steady or 

decline. However, if new facilities are constructed in the CJPA, District regulations for new 

source review (Rule 209-A, 2 1 6, and 2 16-A) and federal PSD regulations (40 CFR 5 1.166 and 

52.21) will prevent PMlO emissions from new facilities from causing or contributing to 

exceedances of the PMl 0 standard. 

The major concern for maintaining PM10 compliance in the CJPA is for windblown dust from 

Owens Lake. Since 13.5 square miles of additional control measures are expected to be 

implemented at Owens Lake by October 1, 20 10, PMlO air quality is expected to continue to 

improve in the CJPA as emissions from Owens Lake decline. District staff believes the control 

strategy and contingency requirements in the 2008 Owens Valley PM 10 SIP are adequate to 

protect air quality in the Coso Junction area. Therefore, no additional contingency measures will 

be needed to ensure future compliance with the federal PMIO standard in the CJPA. 

Furthermore, as a commitment in the Coso Junction PMlO Maintenance Plan, the District will 

continue daily monitoring of PM 10 at the Coso Junction rest area to help ensure new sources of 

PM 10 are identified and controlled if necessary. If an exceedance of the federal PMlO standard 

is monitored the District will investigate the cause of the exceedance within 60 days from the end 

of the calendar quarter in which the event occurred. Exceedances found to be caused by dust 

from Owens Lake will be investigated to determine if the required control measures were 

properly implemented in accordance with Board Order #080 128-0 1. Exceedances found to be 

caused by dust from local sources that are subject to current District regulations will be 

addressed and corrected. Exceedances found to be caused by Exceptional Events, such as 

wildfires or earthquakes will be flagged in accordance with US EPA policy (Federal Register, 

2007). 

The District requests that this document be approved by the California Air Resources Board as 

the PM10 Maintenance Plan for the Coso Junction Planning Area and submitted to the US 

Environmental Protection Agency for their consideration and approval. 
2010 Coso Junction PMIO Maintenance Plan 

I I References 

CARR, 2010a. Comments on CJPA PM10 Emissions Inventory, California Air Resources Board, 

May 4,2010. 

CARB, 20 lob. Emissions Inventory Data, California Air Resources Board, website accessed 

February l I, 20 10, http:llwww.arb.ca.govleilemissiondata.htm. 

Federal Register, 2002a. Clean Air Act Redesignation and Reclassification, Searles Valley 

Nonattainment Area; Designation of Coso Junction, Indian Wells Valley, and Trona 

Nonattainn~ent Arcas; California; Determination of Attainment of the PM-10 Standards for the 

Coso Junction Area Particulate Matter of 10 microns or less (PM-lo), Federal Register, August 

6, 2002, Vol. 67, no. 15 1, pp 50805-50808. 

Federal Register, 2002b. Clean Air Act Redesignation and Reclassification, Searles Valley 

Nonattain~nent Area; Correction, Federal Register, September 19, 2002, Vol. 67, no. 182, pp 

59005-59006. 

Federal Register, 2003a. Approval and Promulgation of Implementation Plans and Designation 

of Areas; California - Indian Wells Valley PM-I 0 Nonattainment Area, Federal Register, May 7, 

2003, vol. 68, no. 88, pp. 24368-24370. 

Federal Register, 2003b. Correction of Areas for Air Quality Planning Purposes; California-- 

PM-10 Nonattainment Area, Federal Register, June 23, 2003, vol. 68, no. 120, pp. 37090-3709 1. 

Federal Register, 2007. Treatment of Data lnfluenced by Exceptional Events, Federal Register, 

March 22, 2007, vol. 72, no. 55, pp 13560-13581. 

GBUAPCD, 1991. Great Basin Unified Air Pollution Control District, PMIO State Implementation 

Plan for the Searles Valley Planning Area, GBUAPCD, Bishop, California, November 199 1. 

GBUAPCD, 1998. Great Basin Unified Air Pollution Control District, Owens Valley PMIO Planning 

Area Demonstration ofAttainment State Implementation Plan, GBUAPCD, Bishop, California, 

November 16, 1998. 

GBUAPCD, 2003. Great Basin Unified Air Pollution Control District, Owens Valley PM~oPlanning 

Area Demonstration ofAttainment State Impfernenlation Plan 2003 Revision, GBUAPCD, Bishop, 

California, November 13, 2003. 

GBUAPCD, 2008. Great Basin Unified Air Pollution Control District, 2008 Owens Valley PMIO 

Planning Area Demonstration ofArtainment State Implementation Plan, GBUAPCD, Bishop, 

California, January 28, 2008. 

GBUAPCD, 2009a. Great Basin lJnified Air Pollution Control District, Ambient Air Monitoring 

Network Plan, GBUAPCD, Bishop, CA, March 27,2009. 
2010 Coso Junction PMIO Maintenance Plan 

GBUAPCD, 2009b. Great Basin Unified Air Pollution Control District, Findings and Order 

Granting Regular Variance from Requirements Set Forth in Governing Board Order 080128-0, 

Docket No. GB09-06, Bishop, California, September 25, 2009. 

US Census Bureau, 20 10. U.S. Census Bureau, State and County QuickFacts, accessed February 1 1, 

201 0, htt~://auickfacts.census.~iov/qfd/states/O6/06027.html. 

USEPA, 2006. United States Environmental Protection Agency, Compilation of Air Pollution 

Emission Factors AP-42 (Fifth Edition), USEPA, Research Triangle Park, North Carolina, updated at 

http://www.epa.~iov/ttn/chief/ap42/index.html. 

Wilderness Society, 2003. Wilderness Society, Summary of the McNally Fire, California: July 21- 

August 29, 2002, Science & Policy Brief, Wilderness Society, Ecology and Economics Research 

Department, Washington, DC, No. 10, March 2003. 
2010 Coso Junction PMlO Maintenance Plan 

BLANK PAGE 
GREAT BASIN UNIFIED AIR POLLUTION CONTROL DISTRICT 

157 Short Strcct, Bishop, Cahforniil 935 14-3537 

Tel: 760-872-821 I J:as: 760-872-61 OC) 

NOTICE OF EXEMPTION 

TO: County Clerk 

County of lnyo 

FROM: Great Basin Unified Air Pollution Control District 

157 Short Street 

Bishop, California 9351 4 

Project Title: 2010 PMlO Maintenance Plan and Redesignation Request for the Coso Junction 

Planning Area 

Project Location - Specific: Coso Junction area in Eastern California, southern portion of lnyo County 

Project Location - County: lnyo County (See Figure 1) 

Description of Project: The 2010 PM10 Maintenance Plan and Redesignation Request for the Coso Junction 

Planning Area is a revision to the 2004 State Implementation Plan (SIP) for Coso Junction. 'The proposed action 

includes: 1) a request to the US Environmental Protection Agency to redesignate the area from nonattainment for 

the National Ambient Air Quality Standard for PMlO (federal standard) to attainment based on monitoring data and 

a modeling analysis, and 2) a maintenance plan that includes requirements to ensure that the federal PMlO 

(particulate matter less than 10 microns in nominal diameter) standard will not be violated in the future. As 

required to redesignate the area to attainment, monitoring data and a modeling analysis showed that the Coso 

Junction Planning Area (CJPA) complied with the federal PMlO standard (150 micrograms per cubic meter for a 24- 

hour average) during the 3-year period from January 2007 through December 2009. The boundaries of the CJPA 

are shown in Figure 1. No new regulations are proposed with the approval of the maintenance plan or the 

recommended action for the US Environmental Protection Agency to redesignate the CJPA from nonattainment to 

attainment with the federal standard. The District will rely on existing District rules for PMlO and requirements in 

the 2008 Owens Valley PMlO SIP to ensure that the federal PMlO standard is maintained in the CJPA. 

Agency Approving and Carrying Out the Project: Great Basin Unified Air Pollution Control District 

Reason Why the Project is Exempt: The project will not result in a direct or reasonably foreseeable indirect physical 

change in the environment. CEQA Guidelines $1 5060(c)(2); 15061 (b)(3). 

Lead Agency Contact Person: Duane Ono, Deputy Air Pollution Control Officer, Telephone: (760) 872-821 1 

- "- /---- 

C, .ZNJ) // c. 

Signature: .- . . . B + -b e +.. - 

Title: Theodore D ~chade, Air Pollut~on Control Officer 

Date Received for filing: 
Theodore D. Schade 

Air Pollufion Control Officer 

GREAT BASIN UNIFIED AIR POLLUTION CONTROL DISTRICT 

157 Short Street, Bishop, California 935143537 

760-872-8211 Fax: 760-872-6109 

NOTICE OF PUBLIC HEARING 

ADOPTION AND APPROVAL OF 201 0 PMlO MAINTENANCE PLANAND 

REDESIGNATION REQUEST FOR THE COSO JUNCTION PLANNING AREA 

PLEASE TAKE NOTICE that the Governing Board of the Great Basin Unified Air Pollution 

Control District (GBUAPCD) will conduct a public hearing and consider for adoption the 2010 

PMlO Maintenance plan and Redesignation Request for the Coso Junction Planning Area (Coso 

PMlO Plan). The public hearing, and the Governing Board's consideration for adoption, will 

occur at the District Governing Board's regular meeting on Monday, May 17, 2010 at 10:OO 

a.m. in the Mono County Supervisors Chamber, Mono County Courthouse, 2" Floor, Main 

Street (Highway 395), Bridgeport, California 935 17. The public hearing on the Coso PMlO Plan 

is set for 10:15 a.m. The Coso PMlO Plan includes 1) a request to redesignate the area from 

nonattainment for the National Ambient Air Quality Standard for PMlO (federal standard) to 

attainment based on monitoring data and a modeling analysis, and 2) a maintenance plan that 

contains requirements to ensure the federal standard will not be violated in the future. Other 

actions related to the adoption of the Coso PMlO Plan may also be taken at the meeting. 

Members of the public will have an opportunity to submit written comments or make oral 

statements at the public hearing. 

The Coso PM10 Plan is available for public review at the GBUAPCD's Bishop Office, 157 Short 

Street, Bishop, California, 93514, at the GBUAPCD web-site: www.gbuapcd.org, and at Inyo 

County Libraries in Independence, Big Pine, Bishop, Lone Pine, Death Valley and Tecopa, 

California. Copies of the Coso PMlO Plan on CD are free of charge upon request. Hardcopies 

are available at reproduction cost ($25) and free of charge to Inyo, Mono and Alpine County 

residents. Written comments are invited, and should be addressed to Theodore D. Schade, Air 

Pollution Control Officer, Great Basin Unified Air Pollution Control District, 157 Short Street, 

Bishop, CA 935 14. Written comments received by the close of business Wednesday, April 28, 

2010, will be included in the staff report sent to the Governing Board members. Comments may 

also be made during the public hearing. For further information, call the District's Board Clerk, 

Tori DeHaven at (760) 872-82 1 1. 

lnyo Register. April 1 and April 15,2010 

Mammoth T~mes: April 2, 2010 

Tahoe Dally Tribune: April 2,20 10 

Dally Independent April 1 and April 15,201 0 
PROOF OF PUBLIC ;TION 

(201 5.5 C.C.P.) 

STATE OF CALIFORNIA, 

COUNTY OF INYO 

I am a citizen of the United States and a 

resident of the County aforesaid. I am over 

the age of eighteen years, and not a party to 

or interested in the above-entitled matter. I 

am the principal clerk of the printer of the 

The lnyo Register 

County of lnyo 

The lnyo Register has been adjudged a 

newspaper of general circulation by the Superior Court of the County of Inyo, State of 

California, under date of Oct. 5, 1953, Case 

Number 5414; that the notice, of which the 

annexed is a printed copy (set in type not 

smaller than non-pareil), has been published 

in each regular and entire issue of said 

newspaper and not in any supplement 

thereof, on the following dates, to wit: 

APRIL 1,15 

in the year 2010 

I certify (or declare) under penalty of perjury 

that the foregoing is true and correct. 

on this 15TH day of APRIL, 2010 

,4 Signature 

Th~s space is for County Clerk's Filing Stamp 

Proof of Publication of 

Public Notice 

ADOPTION AND APPROVAL 

OF 2010 

PMlO MAINTENANCE PLAN 

AND 

REDESIGNATION REQUEST 

FOR THE COSO JUNCTION - ., PLANNING AREA 

,A PLEASE TAKE NOTICE thatt~ 

the Governing Board of the - 

Great Basin Unif~ed Alr Pollution 

Control Dislr~ct (GBUAPCD) mll - 

conduct a pubhc hear~ng and 

consider for adoption the 2010 

PA4 10 Maintenance plan and 

Redes~gnation Reqilest lo/ the 

(Coso PM10 Plan). The public 

I 

Coso Juncrron Plann~ng Area - 

hearing, and the Governing 

Board's consideration for adoptlon, will occur at the D~strlct 

Governing Bcard's regular meeting on Monday, May 17, 2010 

at 10:00 a.m. in the Mono 

County Supervlsors Chamber, 

Mono C~unty Caurthouse, 2nd 

Floor, Main Street (Highwqy 

395), Bridgeport, California 

93517. The public hearing on 

the Coso PM10 Plan is set for 

10.15 am. The Coso PM10 

Plan Includes 1) a request to redesignate the area from nonattalnment for the National Amblent Alr Qual~ty Standard tor 

PMlO (federal standard) to attalnment based on monitoring 

data and a model~ng analysis, 

and 2) a maintenance plan that 

contains requirements to ensure 

the tederal standard wrll not be 

v~olated In the future Other actrons related to the adoption 01 

the Coso PMlO Plan may also h- ot +ha rn.r~t#nn hl~rn- 
Theodore D. Schade 

Air Pollul~on Control Officer 

GREAT BASIN UNIFIED AIR POLLUTION CONTROL DISTRICT 

157 Short Street, Bishop, California 93514-3537 

Tel: 760-872-82 1 1 Fax: 760-872-6109 

Mtg. Date: July 14, 2010 

To: District Governing Board 

From: Tori DeHaven, Board Clerk 

Subject: Approval of minutes of the May 17,2010 Governing Board Regular Meeting 

Summary - Attached for the Board's approval are the minutes from the May 17, 2010 regular 

meeting of the District Governing Board. 

BOARD ACTION 

Staff recommends that the Board review and approve the minutes from the May 17,2010 meeting 

Attachments: 

May 17, 20 10 minutes 

Governing Board Meeting Minutes from May 17, 201 0 

July 14,2010 - Agenda Item No. 3 - Page 1 
GOT'ERhTING BOARD ILILINIJTES 

May 17,201 0 

(All Meetings Are Mechanically Recorded) 

The Great Basin Unified Air Pollution Control District Governing Board of the Counties of 

Alpine, lnyo and Mono, State of California met at 10:OO am on May 17, 2010 in the Mono 

County Supervisors Chambers, Mono County Courthouse, Main Street, Bridgeport, California. 

The following Board members were present: Board Chair Tom Sweeney, Alpine County; Board 

member Henry "Skip" Veatch, Alpine County; Board Vice Chair Linda Arcularius, lnyo County; 

Board member Richard Cervantes, lnyo County; Board member D. "Hap" Hazard, Mono 

County and Board Alternate John Eastman, Town of Mammoth Lakes. Board members 

McCarroll and Hunt were absent. GBUAPCD staff present: Ted Schade, Air Pollution Control 

Officer and Tori DeHaven, Board Clerk. Members of the public included Martin Adams, William 

Vanwagoner and Eric Rosenblatt of the City of Los Angeles Department of Water and Power; 

Justin Raglin, Lone Pine Paiute Shoshone Indian Tribe and Rosanna Marrujo, Owens Valley 

Indian Water Commission. 

Agenda Item#' Board Chair Sweeney called to order the regular meeting of the District 

Call lo Order Board at 10:06 a.m. 

Board Member Veatch led the Pledge of Allegiance. 

Agenda Item #2 Board Chair Sweeney opened the public comment period for matters not on 

Public Comments 

on Matters not on the agenda at 10:06 am. 

the Agenda (No 

Action) No members of the public offered comments. 

Board Chair Sweeney closed the public comment period for matters not on 

the agenda at 10:06 am. 

Agenda Item #3 Motion (HazardICervantes) approving the minutes of the March 15, 2010 

Ofthe regular meetinq of the District Governing Board. 

minutes of the 

March 15, 2010 

Governing Board Motion carried 510 and so ordered. 

meeting 

Board member Eastman abstained. 

BIO 10051 7-03 

Agenda Item #4a Board Chair Sweeney opened the public hearing at 10:07 am to adopt PUBLIC HEARING 

- ~d~~t,~~ oforders orders to the City of Los Angeles to pay the 201 0-201 1 fiscal year SB 270 

to the City of Los mitigation fees as provided by Section 4231 6 of the California Health & 

Angeles to pay the 

2010-201 I fiscal Safety Code. 

year SB 270 

mitigation fees as 

provided by Section APCO Schade summarized for the Board the facts and figures surrounding 

42316 of the 

March 15, 201 0 Board Meeting 

Page 1 of 7 
California Health & 

Safety Code 

Agenda Item #4b 

PUBLIC HEARING 

Fiscal Year 2010-1 1 

Total District Budget 

- Staff report, public 

comments and 

approval of the 

District and SB 270 

sub-budgets 

(Second of two 

required budget 

hearings) 

the Assessment. He noted that on page 11 of the Board Packet, a 'three 

year projection had been prepared by staff at the Board's request. He also 

noted a decrease in staff due to retiring employees. 

Board member Hazard noted that the projection was appreciated as was 

the general effort made by District staff. 

APCO Schade replied that the projections are based on "business as usual" 

scenarios. Things may happen which may cause the budget to fluctuate. 

Board Chair Sweeney called for public testimony at 10: 1 1 am. 

No members of the public offered testimony. 

Board ChairSweeney closed the public hearing at 10:ll am and returned 

discussion to the Board. 

There was a discussion between Board members and APCO Schade 

regarding retiring District employees and how this will affect the budget. 

Motion (ArculariusIHazard) to adopt the "Fiscal Year 201 0-201 1 SB 270 

Assessment Orders to Pav," for the Reqular SB 270 budqet. 

Motion carried 610 and so ordered. 

BIO 100517-4a 

Board Chair Sweeney opened the public hearing at 10:21 am for the Fiscal 

Year 201 0-201 1 Total District Budget. 

APCO Schade summarized for the Board, the aspects of the District budget 

and SB270 sub-budgets. He noted that the only "wrinkle" in the District 

budget is that within the Retiree Health Benefits Trust there is $200,000 in 

unfunded liability that staff would like to fully fund in addition to $100,000, 

using money held in reserves. The Board would need to authorize this 

transfer. 

The Board and APCO Schade discussed the budget as well as California 

state financial issues and funding including state subventions. 

Board Chair Sweeney called for public testimony at 10:29 am. 

No members of the public offered testimony. 

Board Chair Sweeney closed the public hearing at 10:29 am and returned 

discussion to the Board. 

March 15, 201 0 Board Meeting 

Page 2 of 7 
Agenda Item #4c 

PUBLIC HEARING 

Approval of the 

2010 PMlO 

Maintenance Plan 

and Redesignation 

Request for the 

Coso Junction 

Planning Area 

(Coso SIP) 

Agenda Item #5 

Update by the 

APCO on the status 

of the Los Angeles 

Department of 

Water & Power's 

dust control efforts 

at Owens Lake, 

including the use of 

groundwater 

sources 

Motion (HazardICervantes) adoptins the total Great Basin Unified Air 

Pollution Control District budqet which includes: a) the proposed fiscal vear 

201 0-201 1 District budaet; and b) the proposed fiscal year 201 0-201 1 SB 

270 budget as well as the authorization of the transfer of $300,000 from 

reserves to fullv fund the Retiree Health Benefits Trust. 

Motion carried 610 and so ordered. 

510 1 005 1 7-4b 

Board Chair Sweeney opened the public hearing at 10:30 am for the 201 0 

PMlO Maintenance Plan and Redesignation Request for the Coso Junction 

Planning Area (Coso SIP). 

APCO Schade stated that the Environmental Protection Agency (EPA) is 

under court order to either approve the Coso SIP by July 1, 2010 or 

redesignate the Coso Junction Area as a serious nonattainment area. He 

then went on to summarize for the Board the history of the Coso Junction 

Area's current designation by the EPA. 

Board Chair Sweeney called for public testimony at 10:34 am. 

No members of the public offered testimony. 

Board Chair Sweeney closed the public hearing at 10:34 am and returned 

discussion to the Board. 

Motion (Cervantes/Arcularius) approving Resolution 201 0-01 adopt in^ the 

2010 PMlO Maintenance Plan and Redesiqnation Request for the Coso 

Junction Planning Area, making find.ings of fact and authorizing the APCO 

to file a Notice of Exemption from CEQA. 

Motion carried 610 and so ordered. 

610 1 005 1 7-4c 

APCO Schade recapped for the Board the recent activities on ,the Owens 

Lake by the Los Angeles Department of Water & Power (the City). Phase 7 

construction was corr~pleted by the City on time. There are a few areas that 

aren't as wet as they need to be but staff is working with them on that. 

Barnard Construction, who is contracted by the City, has been very 

successful and has actually assisted the District with certain construction 

needs including moving equipment. April 1, 2010 was an important day in 

the settlement agreement because there were a lot of things that needed to 

happen in regard to dust control measures. Most got done however, some 

did not. One change that occurred on April 1 is that the District was given 

the ability to issue notices of violation for exceedances of the PMlo 

standard. The City has never had to pay for any air pollution violations. 

Under the new rules, the District is now allowed and prepared to enforce 

March 15, 201 0 Board Meeting 

Page 3 of 7 
the issuance of NOV's with fines up to $1 0,000 a day. He then discussed 

the fact that the DWP's plan for Moat & Row was rejected by the State 

lands Commission and the idea is dead. APCO Schade stated for the 

Board and the members of the public that further discussion between the 

City, Board and District staff regarding the progress at Owens Lake, would 

be summarized in the minutes but not taken verbatim as it had been in the 

previous Board meeting. The Board agreed. 

Discussion than continued with the Board and the general consensus, as 

established in the previous meeting, was that fines should be imposed. The 

City needs to do whatever it takes to get into and remain in compliance by 

the October 1, 2010 deadline as required by the previously issued variance. 

Representatives from the City than offered reassurance as to their progress 

and their efforts to come up with new ideas to replace Moat & Row in the 

hopes of securing a lease from the SLC in time to meet the October 1, 201 0 

deadline. They also urged the Board, as in the previous meeting, to not 

impose fines. However, it was the Board's position that they would back 

whatever decision is made by the Air Pollution Control Officer when it 

comes to Notice of Violations and the issuance of fines. 

Agenda Item #6 Motion (EastmanNeatch) approvinq the consent aaenda items a throuqh f Consent Agenda and h through i as follows: 

a) Approval of appropriation changes, carryovers and end-of-year 

transfer authority. 

b) Approval of annual Network Monitoring Plan as required by the U.S. 

EPA. 

c) Approval of budgeted consulting contracts. 

d) Approval of contract employee and janitorial service contracts. 

e) Approval of offices and monitoring site leases. 

f) Approval of contracts with lnyo County for legal and financial 

services and contract with external independent auditor. 

h) Approval of out-of-state travel for the Sr. Systems Research Analyst 

to attend the U.S. EPA Air Quality System training and conference in 

Colorado Springs, CO. 

i) Approval of purchase order with California Survey Drafting 

Supplyrrrimble for the purchase of two Global Positioning System units 

and software. ($12,393.20) 

j) Approval of purchase order with the Sensit Company for sand motion 

monitors. ($1 6,686.50) 

Motion carried 610 and so ordered. 

010 1 0051 7-06 

APCO Schade briefedthe Board on the attempts to get a new van. 

. Although this item was previously approved it was brought back to the 

March 15, 201 0 Board Meeting 

Page 4 of 7 
Board because it had to be re-bid due to complications. 

Motion (ArculariusNeatch) approving the consent agenda items g as 

follows: 

g) Approval of purchase of a passenger van (re-bid of previously 

awarded vehicle). 

Motion carried 610 and so ordered. 

Agenda Item #7 NO questions or comments were offered. 

Informational items 

(No Aclion) 

Agenda Item #' Board member Veatch reported that the Kirkwood powerhouse is going to Board member 

reports (NO Action) be rebuilt. It will be equipped with new-generation generators that won't be 

as polluting as the old ones. They are pursuing bringing commercial power 

up Highway 88 from the Salt Springs Reservoir. There's a good chance that 

this will happen within the next couple years. 

APCO Schade noted that there is contingent in Kirkwood that does not 

want diesel powered generators. They want the District to order Kirkwood 

to use natural gas. However, there a lot of reasons that Kirkwood wouldn't 

be able to do this and the APCO intends to issue a permit for the requested 

diesel engines. This may cause the contingent to ask for a hearing to 

appeal the issuance of such a permit. The woman heading the contingent 

opinion is looking toward the future of the Kirkwood residents. 

Agenda Item #9 APCO Schade noted that the Expert Panel procedures are over. Staff had a 

Air Pollution Control 

Officer's Repori booth at the Homeshow recently that went over very well; Board members 

will be provided with bags that were given out at the booth. 

The next regular meeting of the District Board will convene at 10:30 am on 

Agenda Item #lo Wednesday, July 14, 2010 in Markleeville, California. The District's Board 

Set date and 

localion of next Clerk will find and reserve a handicap-accessible meeting room and contact 

regular meeting District Board members as to its location. 

(July, usually in 

Alpine County) 

Agenda ltem#11 CLOSED SESSION: Evaluation of performance - Section 54957(b)(I) of 

CLOSED SESSION the California Government Code. Employee being evaluated: Air Pollution 

Control Officer. 

Board Chair Sweeney convened the meeting to closed session at 

12:ll pm. 

Agenda Item #I2 

SESSIO~ CLOSED SESSION: Conference with Labor Negotiator - Section 54957.6 

March 15, 2010 Board Meeting 

Page 5 of 7 
Agenda Item #I3 

Approval of 

Memorandums of 

Agreement between 

the Great Basin 

Unified APCD 

Governing Board 

and the Great Basin 

Unified APCD NonManagement and 

Management 

Employee Groups 

regarding changes 

in wages and 

benefits 

of the California Government Code: Changes regarding the salaries, sdlary 

schedules or compensation paid in the form of fringe benefits. Employee 

organizations: Great Basin Unified Air Pollution Control District 

Management Employees Group, Great Basin Unified Air Pollution Control 

District Non-Management Employees Groups and Air Pollution Control 

Officer. 

Board Chair Sweeney reconvened the open session at 1 :47 pm 

The Board came back with nothing to report on item 11. 

Motion (CervantesNeatch) approvinq and authorizing the Board Chair to 

sign a memorandum of agreement with manaqement and non-management 

employees which includes: a I % increase in salaries from 2009-2010 for 

the 2010-201 1 fiscal Vear with no changes to benefits. 

Motion carried 610 and so ordered. 

BIO 10051 7-1 3 

Board member Arcularius asked that staff email a "man-power report" 

specifying classifications and salaries for staff to all the Board members. 

It was also agreed by the Board and APCO Schade that the Air Pollution 

Control Officer's job performance evaluation and complete report would be 

emailed to the Board as well. 

Agenda Item #I4 Due to contractual questions, this agenda item will be carried over until the 

Consideration of 

contract amendment July 14, 201 0 Governing Board meeting. 

with the Air Pollution 

control Officer for 

the provision of 

personal services as 

a District officer 

Adjournment The meeting was adjourned at 1:49 p.m. The Board will reconvene in 

open session at 10:30 a.m. on July 14, 2010 in Markleeville, California at a 

location to be determined. 

March 15, 201 0 Board Meeting 

Page 6 of 7 
Attest: 

Tom Sweeney, Chair 

Tori DeHaven, Board Clerk 

March 15, 20 10 Board Meeting 

Page 7 of 7 
201 0 PMIO Plan 

for the 

Great Basin Unified Air Pollution Control District 

Public Hearing Notice and Transcript 
CALIFORNIA AIR RESOURCES BOARD 

NOTICE OF PUBLIC MEETING TO CONSIDER APPROVAL OF THE COSO 

JUNCTION PM10 REDESIGNATION REQUEST AND MAINTENANCE PLAN 

The Air Resources Board (ARB or Board) will conduct a public meeting at the time and 

place noted below to consider the approval of the proposed PMlO Redesignation 

Request and Maintenance Plan for the Coso Junction Planning Area that was 

developed and approved by the Great Basin Unified Air Pollution Control District 

(District). If adopted, ARB will submit these elements to the United States 

Environmental Protection Agency (U.S. EPA) for approval as a revision to the California 

State Implementation Plan. 

DATE: June 24,201 0 

TIME: 9:00 a.m. 

PLACE: California Environmental Protection Agency 

Air Resources Board 

Byron Sher Auditorium, Second Floor 

1001 1 Street 

Sacramento, California 95814 

This item will be considered at a two-day meeting of the Board, which will commence at 

9:00 a.m., June 24, 2010, and may continue at 8:30 a.m., June 25, 2010. This item is 

scheduled to be heard on the Board's Consent Calendar. All items on the consent 

calendar will be voted on by the Board immediately after the start of the public meeting. 

Any item may be removed from the consent calendar by a Board member or at the 

request of a Board member or if someone in the audience would like to speak on that 

item. 

BACKGROUND 

The federal Clean Air Act establishes planning requirements for those areas that 

exceed the health-based National Ambient Air Quality Standards (standards). Areas are 

designated as nonattainment based on monitored exceedances of air quality standards. 

These nonattair~ment areas must develop and implement a State lmplementation Plan 

(SIP) that demonstrates how they will attain the standards by specified dates. 

The District adopted the first PMI 0 attainment plan for the Coso Junction Planning Area 

(Coso Junction) in 1991. The Coso Junction attainment demonstration was based on 

controlling dust from Owens Lake. In addition, in a 2004 plan update, the District 

included a dispersion model analysis that indicated that after dust controls were 

implemented at Owens Lake, Coso Junction would be in attainment. 

On May 19, 201 0, the U.S. EPA finalized its determination in the Federal Register that 

Coso Junction attained the 24-hour PM10 standard. In this clean data finding, U.S. EPA 
waived certain planning requirements including those for reasonable further progress, 

an attainment demonstration, reasonably available control measures, and contingency 

measures, since these provisions have the sole purpose of helping achieve attainment 

of the standard. 

On May 17, 2010, the District adopted the PMIO Redesignation Request and 

Maintenance Plan (Plan) for Coso Junction. The Plan officially requests that this area 

be redesignated to attainment for the PMlO standard and charts the course for 

continued maintenance of the standard. The adoption of controls on Owens Lake 

resulted in the Coso Junction attaining the 24-hour PMIO standard based on 2007-2009 

PMIO data. 

PROPOSED ACTION 

ARB staff has reviewed the District's Maintenance Plan for Coso Junction and has 

concluded that it meets applicable Clean Air Act requirements. ARB staff has also 

determined that the Maintenance Plan would ensure continued maintenance of the 

standard for the required ten years following redesignation. Staff is recommending that 

the Board approve the Maintenance Plan, as well as the corresponding emissions 

inventory and maintenance demonstration as a revision to the California SIP. In 

addition, ARB staff is recommending that the Board approve the District's request that 

Coso Junction be redesignated from nonattainment to attainment for the federal PMI 0 

standard. 

AVAILABILITY OF DOCUMENTS 

ARB staff has prepared a written Staff Report. Copies of the Staff Report may be 

obtained from the ARB Public Information Office, 1001 "1" Street, First Floor, 

Environmental Services Center, Sacramento, California 9581 4, (91 6) 322-2990. This 

notice, the Staff Report, and the District's Coso Junction PMIO Maintenance Plan will 

be available from ARB'S website at: 

http://www.arb,ca.qov/planninq/sip/sip.htm 

SUBMITTAL OF COMMENTS 

Interested members of the public may also present comments orally or in writing at the 

meeting, and in writing or by e-mail before the meeting. To be considered by the Board, 

written comment submissions not physically submitted at the meeting must be received 

no later than 12:OO noon. June 23, 2010, and addressed to the following: 

Postal mail: Clerk of the Board, Air Resources Board 

1001 1 Street, Sacramento, California 95814 

Electronic submittal: http://www.arb.ca.gov/lispub/comm/bclist.php 

The Board requests, but does not require that 20 copies of any written statement be 

submitted and that written and e-mail statements be filed at least 10 days prior to the 
meeting so that ARB staff and Board members have time to fully consider each 

comment. 

Please note that under the California Public Records Act (Government Code 

section 6250 et seq.), your written and oral comments, attachments, and associated 

contact information (e.g., your address, phone, email, etc.) become part of the public 

record and can be released to the public upon request. Additionally, this information 

may become available via Google, Yahoo, and any other search engines. 

Further inquiries regarding this matter should be directed to Ms. Sylvia Zulawnick, 

Manager of the Particulate Matter Analysis Section, Planning and Technical Support 

Division at (916) 324-71 63, or Elizabeth Melgoza, Air Pollution Specialist, Planning and 

Technical Support Division at (91 6) 322-61 61. 

To request a special accommodation or language needs for any of the following: 

An interpreter to be available at the hearing. 

Have documents available in an alternate format (i.e. Braille, Large print) or 

another language. 

A disability-related reasonable accommodation. 

Please contact the Clerk of the Board at (916) 322-5594 or by facsimile at 

(916) 322-3928 as soon as possible, but no later than 10 business days before the 

scheduled Board hearing. TTYITDDISpeech to Speech users may dial 71 1 for the 

California Relay Service. 

Para solicitar alguna comodidad especial o necesidad de otro idiorna para alguna 

de las siguientes: 

Un interprete que este disponible en la audiencia. 

Tener documentos disponibles en un formato alterno (por decir, sistema Braille, 

o en impresion grande) u otro idioma. 

Una acomodacion razonable relacionados con una incapacidad. 

Por favor llame a la oficina del Secretario del Consejo de Recursos Atmosfericos al 

(916) 322-5594 o envie un fax al(916) 322-3928 no menos de diez (I 0) dias laborales 

antes del dia programado para la audiencia. Para el Servicio Telefonico de California 

para Personas con Problemas Auditivos, 6 de telefonos TDD pueden marcar al 71 1. 

CALIFORNIA AIR RESOURCES BOARD 

James N. Goldstene 

Executive Officer 

Date: June 8, 2010 
MEETING 

STATE OF CALIFORNIA 

AIR RESOURCES BOARD 

JOE SERNA, JR. BUILDING 

CALIFORNIA ENVIRONMENTAL PROTECTION AGENCY 

BYRON SHER AUDITORIUM, SECOND FLOOR 

1001 I STREET 

SACRAMENTO, CALIFORNIA 

THURSDAY, JUNE 24, 2010 

9:14 A.M. 

TIFFANY C. KRAFT, CSR, RPR 

CERTIFIED SHORTHAND REPORTER 

LICENSE NUMBER 12277 

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APPEARANCES 

BOARD MEMBERS 

Ms. Mary Nichols, Chairperson 

Dr. John R. Balmes 

Ms. Sandra Berg 

Ms. Doreene DIAdamo 

Ms. Lydia H. Kennard 

Mr. Ronald 0. Loveridge 

Mr. Ron Roberts 

Dr. Daniel Sperling 

Dr. John Telles 

Mr. Ken eager 

STAFF 

Mr. James Goldstene, Executive Officer 

Ms. La Ronda Bowen, Ombudsman 

Mr. Tom Cackette, Chief Deputy Executive Officer 

Mr. Bob Fletcher, Deputy Executive Officer 

Ms. Ellen Peter, Chief Counsel 

Ms. Lynn Terry, Deputy Executive Officer 

Ms. Lori Andreoni, Board Clerk 

Ms. Lezlie Kimura, Local Government Strategies Section, 

Planning and Technical Support Division (PTSD) 

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APPEARANCES CONTINUED 

STAFF 

Ms. Cynthia Marvin, Assistant Division Chief, PTSD 

Ms. Meri Miles, On Road Controls Branch, Mobile Source 

Control Division (MSCD) 

Mr. Todd Sterling, Air Pollution Specialist, Control 

Strategies Section, Stationary Source Division (SSD) 

Ms. Barbara Van Gee, Manager, Goods Movement Programs 

Section, Stationary Source Division (SSD) 

ALSO PRESENT 

Mayor Janet Abelson, City of El Cerrito 

Dr. Janet Abshire 

Ms. Elizabeth Adams, IS EPA 

Ms. Anna Arriola, East Yard Communities for Environmental 

Justice 

Mr. ~nri~ue Arriola, East Yard Communities for 

Environmental Justice 

Ms. Bernice Banares, West Side of Long Beach 

Mr. Marcos Barbosa, ECYECJ 

Ms. Jenny Bard, American Lung Association 

Mr. Mike Barr, AAR 

Ms. Nidia Bautista, Coalition for Clean Air 

Mr. Omar Benjamin, Port of Oakland 

Ms. Autumn Bernstein, Climate Plan 

Mr. Damian Breen, Bay Area AQMD 

Mr. Graham Brownstein, Transform 

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APPEARANCES CONTINUED 

ALSO PRESENT 

Mr. Tim Carmichael, CA Natural Gas Vehicle Coalition 

Mr. Andy Chesly, San Joaquin County Council of Governments 

Ms. Madeline Clarke, EYCEJ 

Ms. Hannah Cohen, The Cohen Group 

Mr. Steph DiStefano, Calthorpe Associates 

Mr. Terry Dressler, Santa Barbara County Air Pollution 

Control District 

Ms. Teri Duarte, Design Sacramento 4 Health 

Ms. Amanda Eaken, NRDC 

Mr. Evan Edgar, Clean Fleets Coalition 

Mr. John Ellison, Environmental Council of Sacramento 

Mr. Michael Endicott, Sierra Club California 

Ms. Devilla Ervin 

Mr. Gary Gallegos, San Diego County Council of Governments 

Ms. Connie Gallippi, The Nature Conservancy 

Ms. Josie Gonzales, SCAQMD 

Mr. Manny Goona, EYCEJ 

Mr. Peter Greenwald, SCAQMD 

Mr. Woody Hastings, Clean Air Now 

Mr. Steve Herninger, Bay Area Metropolitan Transportation 

Commission 

Ms. Bonnie Holmes-Gen, American Lung Association 

Ms. -Andrea Hricko, USC & Public Health 

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APPEARANCES CONTINUED 

ALSO PRESENT 

Mr. Hasan Ikhrata, Southern California Association of 

Governments 

Mr. Mike Jacob, PMSA 

Mr. Curt Johansen, Urban Land Institute 

Mr. Bob Johnson, UC Davis 

Mr. Bob Kard, San Diego APCD 

Mr. Andy Katz, Breathe California 

Dr. Alex Kelter, Environmental Council of Sacramento 

Mr. Brandon Kitagawa, RAMP 

Mr. Gideon Kracov, East Yard Communities for Environmental 

Justice 

Mr. Gary Liss, City of Loomis 

Mr. Angelo Logan, EYCEJ 

Mr. Kirk Marckwald, California Railroad Industry 

Mr. Jessie Marquez, Coalition for Safe Environment 

Mr. Nathen Mata, EYCEJ 

Mr. Eyal Matoy, Ditching Dirty Diesel Collaborative 

Dr. Stephen Maxwell 

Mr. Mike McKeever, Sacramento Area Council of Governments 

Mr. Armando Mej i a, Urban Planner 

Mr. Fred Minassian, South Coast AQMD 

Ms. Steph Nelson, Association of Monterey Bay Area 

Governments 

Ms. Gloria Ohland, Move LA 

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APPEARANCES CONTINUED 

ALSO PRESENT 

Mr. Dave Patterson, Mitsubishi Motors 

Ms. Katherine Perez, Urban Land Institute 

Mr. Scott Peterson, Oakland Metropolitan Chamber of 

Commerce 

Mr. Terry Preston, Walk Sacramento 

Ms. Jill Ratner, Rose Foundation New Voice Project 

Ms. Sepi Richardson, City of Brisbane 

Ms. Marisa Rimland, Public Health Institute 

Mr. Sonny Roque, East Yard Communities for Environmental 

Justice 

Mr. Jim Rothstein 

Ms. Rocio Ruiz, ICUC 

Mr. Larry Schmid, UPRR 

Mr. Tim Schott, California Association of Port Authorities 

Mr. Seyed Sedredin, San Joaquin Valley APCD 

Mr. Mark Stehly, BNSF 

Mr. Michael Villegas, Air Pollution Control Officer, 

Ventura County 

Ms. Debbie Vongviwat, East Yard Communities for 

Environmental Justice 

Mr. Barry Wallerstein, SCAQMD 

Mr. Jerry Walters, Fehr & Peers Transportation Consultants 

Mr. Dennis Zane, Move LA 

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INDEX 

PAGE 

Item 10-6-1 

Chairperson Nichols 

Mot ion 

vote 

Item 10-6-2 

Chairperson Nichols 

~xecutive Officer Goldstene 

Staff Presentation 

MS. Holmes-Gen 

Mr. Villegas 

Mr. Hogo 

Mr. Dressler 

Board Discussion 

Motion 

vote 

Item 10-6-5 

Chairperson Nichols 

Executive Officer Goldstene 

Staff Presentation 

Ms. Gonzales 

Mr. Greenwald 

Mr. Wallerstein 

Ms. Ratner 

Mr. Ervin 

Ms. Adams 

Mr. Matoy 

Ms. Ruiz 

Mr. Arriola 

Ms. Arriola 

Mr. Roque 

Mr. Mejia 

Mr. Barbosa 

Mr. Goona 

Mr. Mata 

Ms. Clarke 

Mr. Logan 

Mr. Carmichael 

Ms. Vongviwat 

Ms. Banares 

Mr. Marquez 

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INDEX CONTINUED 

PAGE 

Item 10-6-5 (continued) 

Ms. Holmes-Gen 

Ms. Hernandez 

Mr. Kitagawa 

Ms. Bautista 

Mr. Kracov 

Ms. Hricko 

Mr. Stehly 

Mr. Schmid 

Mr. Barr 

Mr. Marckwald 

Board Discussion 

Motion 

Vote 

Item 10-6-6 

Chairperson Nichols 

Executive Officer Goldstene 

Staff Presentation 

Mr. Gallegos 

Mr. Heminger 

Mr. Ikhrata 

Mr. McKeever 

Mr. Chesly 

Board Q&A 

Ms. Perez 

Mr. Johansen 

Ms. Richardson 

Mayor Abelson 

Mr. Liss 

Dr. Maxwell 

Dr. Abshire 

Mr. Wallerstein 

Mr. DeStefano 

Ms. Eaken 

Mr. Walters 

Ms. Nelson 

Mr. Hightower 

Dr. Kelter 

Ms. Bard 

Ms. Holmes-Gen 

MS. Duarte 

Mr. Kitagawa 

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INDEX CONTINUED 

PAGE 

Item 10-6-6 (continued) 

Ms. Cohen 

Ms. Bernstein 

Ms. Ohland 

Mr. Zane 

Mr. Preston 

Mr. Hastings 

Ms. Rimland 

Mr. Johnson 

Mr. Katz 

Ms. Gallippi 

Mr. Brownstein 

Mr. Endicott 

Mr. Ellison 

Board Discussion 

Item 10-6-3 

Chairperson Nichols 

Executive Officer Goldstene 

Staff Presentation 

Mr. Villegas 

Mr. Minassian 

Mr. Sedredin 

Mr. Kard 

Mr. Edgar 

Mr. Breen 

Mr. enj jam in 

Mr. Peterson 

Mr. Schott 

Mr. Jacob 

Board Discussion 

Motion 

vote 

Item 10-6-4 

Chairperson Nichols 

Motion 

' Mr. Carmichael 

Mr. Patterson 

Vote 

Public Comment 

Mr. Rothstein 

Adjournment 

Reporter's Certificate 

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1 

PROCEEDINGS 

2 CHAIRPERSON NICHOLS: Good morning, ladies and 

3 gentlemen. The June 24th, 2010, public meeting of the Air 

4 Resources Board will come to order. 

5 And we will begin the meeting as we usually do, 

6 by rising and saying the Pledge of Allegiance. 

7 (Thereupon the Pledge of Allegiance was 

Recited in unison.) 

CHAIRPERSON NICHOLS: The Clerk will please call 

10 the roll 

11 BOARD CLERK ANDREONI: Dr. Balmes? 

12 BOARD MEMBER BALMES: Here. 

13 BOARD CLERK ANDREONI: Ms. Berg? 

14 BOARD MEMBER BERG: Here 

15 BOARD CLERK ANDREONI: Ms. DIAdamo? 

16 BOARD MEMBER D'ADAMO: Here. 

17 BOARD CLERK ANDREONI: Ms. Kennard? 

18 Mayor Loveridge? 

19 BOARD MEMBER LOVERIDGE: Here. 

2 0 BOARD CLERK ANDREONI: Mrs. Riordan? 

2 1 Supervisor Roberts? 

2 2 BOARD MEMBER ROBERTS: Here. 

2 3 BOARD CLERK ANDREONI: Professor Sperling? 

2 4 BOARD MEMBER SPERLING: Here. 

2 5 BOARD CLERK ANDREONI: Dr. Telles? 

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BOARD MEMBER TELLES: Present. 

BOARD CLERK ANDREONI: Supervisor Yeager? 

BOARD MEMBER YEAGER: Here. 

BOARD CLERK ANDREONI: Chairman Nichols? 

CHAIRPERSON NICHOLS: Here. 

BOARD CLERK ANDREONI: Madam Chair, we have a 

quorum. 

CHAIRPERSON NICHOLS: Thank you. 

I have a couple of announcements to make before 

we begin the meeting. 

First of all, there is a change in the agenda 

order. Item 10-6-6, which is the report to the Board on 

target setting efforts under SB 375 is going to be heard 

right after Agenda Item 10-6-5, which is the staff 

recommendations to provide further emissions reductions at 

high-risk rail yards. 

Translation services are available at this 

meeting in Spanish for anyone who wishes them. The head 

sets are available outside the hearing room at the 

attendance sign-up table. Is the -- yes, thank you. 

(Thereupon the announcement was translated 

into Spanish.) 

CHAIRPERSON NICHOLS: Anyone who wishes to 

testify should sign up with the attendant outside the 

boardroom, please. You are requested, but not required, 

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3 

1 to include your name on the speaker card. It just helps 

2 us organize the notes of the meeting. 

3 And, in general, we impose a three-minute time 

4 limit. We may actually reduce that amount if there's a 

5 very heavy number of speakers and if the comments are 

6 somewhat consistent or repetitive. 

7 We appreciate it if when you do testify you put 

8 your testimony in your own words rather than reading a 

9 statement. If you have a written statement, it will go 

10 into the record directly, and you don't need to read it 

11 aloud to us. 

12 I'm also to remind you that there are emergency 

13 exits in the back of the room, as well as to my right and 

14 left side up here on the podium. In the event of a fire 

15 alarm, we're required to evacuate this room immediately 

16 and go down the stairs, not using the elevator to get out 

17 of the building. When the all-clear signal is given, 

18 we'll return to the hearing room and resume the hearing. 

19 We are hoping there will not be a fire drill, but we 

20 understand there is one due in the next day or two. So it 

21 might actually happen. 

2 2 All right. The first item on the agenda is our 

23 consent calendar, which is the redesignation of Coso 

24 Junction for PM10. 

2 5 And I'd like to ask the Board Clerk if any 

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witnesses have signed up to testify on this item. 

BOARD CLERK ANDREONI: No. 

CHAIRPERSON NICHOLS: Are there any Board members 

who would like to have this item removed from the consent 

calendar? 

Seeing none, I will close the record on this 

item. 

Are there any ex parte communications on this 

item that anyone wishes to disclose? 

Seeing none, the Board has before it Resolution 

11 Number 10-25. Could I get a motion and a second? 

12 BOARD MEMBER BERG: So moved. 

13 BOARD MEMBER ROBERTS: Second. 

14 CHAIRPERSON NICHOLS: Motion and second. 

15 We will do this by voice vote. All in favor 

16 please say aye. 

(Ayes) 

CHAIRPERSON NICHOLS: ,Any opposed? 

Great. 

Now we move to a regulatory item, which is 

21 proposed amendments to the regulations for commercial 

22 harbor craft. Staff is proposing amendments that would 

23 expand the scope of the current rule to include three 

24 additional categories of harbor craft. This action would 

25 result in additional diesel particulate and NOx reductions 

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201 0 PMIO Plan 

for the 

Great Basin Unified Air Pollution Control District 

Air Resources Board Resolution 
State of California 

AIR RESOURCES BOARD 

Resolution 10-25 

June 24, 201 0 

Agenda Item No: 10-6-1 

WHEREAS, the Legislature in Health and Safety Code section 39602 has designated 

the State Air Resources Board (ARB or Board) as the air pollution control agency for all 

purposes set forth in federal law; 

WHEREAS, the ARB is responsible for the preparation of the State Implementation Plan 

(SIP) for attaining and maintaining the national ambient air quality standards (NAAQS) 

as required by the federal Clean Air Act (the Act; 42 U.S.C. section 7401 et seq.), and to 

this end is directed by Health and Safety Code section 39602 to coordinate the activities 

of all local and regional air pollution control and air quality management districts 

(districts) necessary to comply with the Act; 

WHEREAS, section 39602 of the Health and Safety Code also provides that the SIP 

shall include only those provisions necessary to meet the requirements of the Act; 

WHEREAS, ARB has responsibility for ensuring districts meet their responsibilities 

under the Act pursuant to sections 39002, 39500, 39602, and 41650 of the Health and 

Safety Code; 

WHEREAS, ARB is authorized by section 39600 of the Health and Safety Code to do 

such acts as may be necessary for the proper execution of its powers and duties; 

WHEREAS, sections 3951 5 and 3951 6 of the Health and Safety Code provide that any 

power, duty, purpose, function or jurisdiction of the Board may be delegated to the 

Board's Executive Officer as the Board deems appropriate; 

WHEREAS, the local air districts have primary responsibility for the control of air 

pollution from non-vehicular sources and for adopting control measures, rules, and 

regulations to attain the NAAQS within their boundaries pursuant to sections 39002, 

40000,40001,40701,40702, and 4165Q of the Health and Safety Code; 

WHEREAS, the Great Basin Unified Air Pollution Control District (District) was 

established pursuant to section 40150 of the Health and Safety Code as the air pollution 

control district responsible for carrying out these responsibilities in the Coso Junction 

Planning Area located in lnyo County; 
Resolution 10-25 2 

WHEREAS, the United States Environmental Protection Agency (U.S. EPA) designated 

the Coso Junction Planning Area as a "moderate" PMI 0 nonattainment area in 2002; 

WHEREAS, in November 2004, the District adopted a SIP for the Coso Junction 

Planning Area which relied on implementing dust controls at Owens Lake, which was 

scheduled to implement dust control measures on 30 square miles of the lake bed by 

December 31, 2006; 

WHEREAS, a dispersion modeling analysis showed these dust mitigation efforts would 

be adequate to bring the Coso Junction Planning Area into attainment; 

WHEREAS, due to a consent decree, U.S. EPA is required to either redesignate the 

Coso Junction Planning Area to attainment for PMlO or bump the area up to "serious1' 

by July 31, 201 0; 

WHEREAS, section 1 07(d)(3)(D) of the Act provides that a state may request U.S. EPA 

to redesignate an area from nonattainment to attainment for the NAAQS; 

WHEREAS, section 107(d)(3)(E) of the Act sets forth the req~~irements which must be 

met for U.S. EPA to redesignate an area from nonattainment to attainment; 

WHEREAS, consistent with section 107(d)(3)(E) of the Act, the District has 

demonstrated attainment of the PMIO NAAQS in the 2007-2009 period for the Coso 

Junction Planning Area, based on quality-assured federal reference method monitoring 

data from the State and local monitoring network; 

WHEREAS, on May 19, 201 0, U.S. EPA issued a final clean data finding for the Coso 

Junction Planning Area; 

WHEREAS, the clean data finding relieves the Coso Junction Planning Area from 

developing an attainment demonstration, Reasonable Further Progress, Reasonable 

Available Control Measures, and contingency measures; 

WHEREAS, the District developed the Coso Junction Maintenance Plan to address the 

requirements of the Act; 

WHEREAS, the Coso Junction Maintenance Plan contains: 

1. Attainment Emission Inventory; 

2. Maintenance Demonstration; and 

3. Contingency Plan. 

WHEREAS, no significant growth is expected in the emissions inventory through the 

year 2025; 
Resolution 10-25 3 

WHEREAS, since transportation sources were not found to significantly contribute to 

the nonattainment problem in the Coso Junction Planning Area, transportation 

conformity budgets are not required; 

WHEREAS, federal law set forth in section 1 lO(1) of the Act and Title 40, Code of 

Federal Regulations, section 51.102, requires that one or more public hearings, 

preceded by at least 30 days notice and opportunity for public review, must be 

conducted prior to the adoption and submittal to the U.S. EPA of any SIP revision; 

WHEREAS, as required by federal law, the District made the Coso Junction 

Maintenance Plan available for public review at least 30 days prior to the hearing date; 

WHEREAS, following a public hearing on May 17, 2010, the District Board voted to: 

1. Adopt the Coso Junction Maintenance Plan to fulfill the applicable requirements 

of the Act for a moderate PMlO nonattainment area to be redesignated to 

attainment; and 

2. Request a redesignation for the Coso Junction Planning Area to attainment for 

the PMlO standard. 

WHERAS, the District submitted the Coso Junction Maintenance Plan to ARB as a SIP 

revision on May 17, 2010, in accordance with State and federal law; 

WHEREAS, the District requests that the Coso Junction Planning Area be redesignated 

from nonattainment to attainment with the federal PMI 0 standard; 

WHEREAS, the California Envirorrmental Quality Act (CEQA) requires that no project 

which may have significant adverse environmental impacts may be adopted as 

originally proposed if feasible alternative or mitigation measures are available to reduce 

or eliminate such impacts, unless specific overriding considerations are identified 

outweigh the potential adverse consequences of any unmitigated impacts; 

WHEREAS, the District determined they are exempt from CEQA because the SIP will 

not result in a direct or reasonably foreseeable indirect physical change in the 

environment; and 

WHEREAS., ,the Board finds that: 

1. California's air pollution control programs have successfully reduced PMlO 

ambient concentrations leading to PMI 0 NAAQS attainment in the Coso 

Junction Planning Area; 

2. The Coso Junction PMIO Maintenance Plan is necessary for U.S. EPA to 

redesignate the Coso Junction to attainment for the PMIO NAAQS; 

3. The District's Coso Junction PMIO, Maintenance Plan complies with the 

requirements of section 107(d)(3)(E) of the Act; 
Resolution 10-25 4 

4. The Coso Junction PMI 0 Maintenance Plan provides for maintenance of the 

PMI 0 NAAQS through 2025; 

5. Consistent with U.S. EPA guidance, the Coso Junction PIVIIO Maintenance 

Plan includes an attainment emission inventory, cornmitrnents by the District to 

continue operating the PMlO monitoring network; and a process to verify 

continued PMIO attainment; 

6. The Coso Junction PMlO Maintenance Plan includes contingency provisions to 

ensure prompt correction of any post-redesignation violation of the PMIO 

NAAQS; and 

7. The Coso Junction PIVIIO Maintenance Plan relies entirely on adopted 

regulations to demonstrate continued maintenance. ARB regulations which 

have been adopted and are reflected in the baseline emission projections were 

subject to environmental review and no further analysis is required at this time. 

WHEREAS, the Board further finds the ARB has reviewed and considered the Coso 

Junction Maintenance Plan, along with the comments presented by interested parties, 

and ARB staff finds the SIP meets the requirements of the Act and CEQA. 

NOW, THEREFORE, BE IT RESOLVED that .the Board hereby adopts the Coso 

Junction Maintenance Plan and Redesignation Request as a revision to the California 

SIP. 

BE IT FURTHER RESOLVED that the Board hereby directs the Executive Officer to 

submit the Coso Junction Maintenance Plan together with the appropriate supporting 

documentation to the U.S. EPA for approval as revision to the California SIP, to be 

effective, for purposes of federal law, upon approval by U.S. EPA. 

BE IT FURTHER RESOLVED that the Board directs the Executive Officer to work with 

the District and U.S. EPA and take appropriate action to resolve any completeness or 

approvability issues that may arise regarding the SIP submission. 

BE IT FURTHER RESOLVED that the Board authorizes the Executive Officer to include 

in the SIP submittal any technical corrections, clarifications, or additions that may be 

necessary to secure U.S. EPA approval. 

BE IT FURTHER RESOLVED, that the Board certifies pursuant to 40 C.F.R. Section 

51.102 that the proposed SIP revision was adopted after notice and public hearing as 

required by 40 C.F.R. Section 51 .I 02. 

I hereby certify that the above is a true and 

correct copy of Resolution 10-25, as adopted 

by the Air Resourqes Board. 
2010 PMIO Plan 

for the 

Great Basin Unified Air Pollution Control District 

Air Resources Board Staff Report 

Analysis of the Coso Junction 

PM70 Redesignation Request and 

Maintenance Plan 
State of California 

- California Environmental Protection Aqency 

AIR RESOURCES BOARD 

Staff Report 

Analysis of the Coso Junction 

PMlO Redesignation Request and 

Maintenance Plan 

Release Date: June 7, 2010 

Scheduled for Consideration: June 24, 201 0 
This document has been reviewed by the staff of the California Air Resources Board 

and approved for publication. Approval does not signify that the contents necessarily 

reflect the views and policies of the Air Resources Board, nor does the mention of trade 

names or commercial products constitute endorsement or recommendation for use. 
TABLE OF CONTENTS 

I . BACKGROUND ...................................................................................................... 1 

II . REDESIGNATION REQUIREMENTS .................................................................... 1 

Ill . EVALUATION OF THE COSO JUNCTION PLAN ...................... ; .......................... 2 

A . Coso Junction Attains the 24-Hour PM10 Standard .......................................... 2 

B . The State Has Met Applicable Act Requirements ....................................... 3 

C . Improvement in Coso Junction's PMIO Air Quality is Due to Permanent and 

Enforceable Reductions in Emissions ............................................................... 3 

D . Maintenance Plan .............................................................................................. 4 

1 . Attainment Emission Inventory ...................................................................... 4 

2 . Maintenance Demonstration .......................................................................... 5 

3 . PM 10 Monitoring Network ........................................................................ 5 

4 . Verification of Continued Attainment ............................................................. 5 

5 . Contingency Plan .......................................................................................... 5 

IV . STAFF RECOMMENDATION ................................................................................ 6 
1. BACKGROUND 

The Coso Junction Planning Area (Coso Junction) was initially designated as a PMIO 

nonattainment area in 1987 along with the Indian Wells Valley and Trona areas. 

Together they comprised the Searles Valley PMIO nonattainment area. The Great 

Basin Unified Air Pollution Control District (District) adopted the first PMI 0 attainment 

plan for the Coso Junction portion of the Searles Valley PMIO nonattainment area in 

November 1991. The Coso Junction attainment demonstration was based on controlling 

dust from Owens Lake. In August 2002, the US Environmental Protection Agency 

(U.S. EPA) redesignated the Searles Valley into three separate PMIO nonattainment 

areas; Coso Junction, Indian Wells Valley, and Trona. 

On May 19, 2010, the U.S. EPA finalized its determination in the Federal Register that 

Coso Junction attained the 24-hour PMIO standard. Based on their clean data finding, 

U.S. EPA has determined that certain nonattainment area requirements do not apply, 

including those for reasonable further progress (RFP), an attainment demonstration, 

reasonably available control measures (RACM), and contingency measures, because 

these provision's sole purpose is to achieve attainment of the standard. On May 17, 

201 0, the District adopted the PMIO Redesignation Request and Maintenance Plan 

(Plan) for Coso Junction. The Plan officially requests that this area be redesignated to 

attainment for the PMIO standard and charts the course for continued maintenance of 

the standard. The concerted adoption of controls on Owens Lake resulted in the Coso 

Junction attaining the 24-hour PMIO standard based on 2007-2009 PMIO data. 

II. REDESIGNATION REQUIREMENTS 

Air Resources Board (ARB) staff reviewed the Coso Junction PMIO Maintenance Plan 

within the context of the Clean Air Act (Act), which identifies the following requirements 

an area must meet tobe redesignated to attainment: 

A. The PM 10 standard has been attained; 

6. The District has an approved State Implementation Plan (SIP) and the State has 

met all applicable Act requirements for PMI 0 in the nonattainment area; 

C. The improvement in PMIO air quality is due to permanent and enforceable 

emission reductions; and 

D. U.S. EPA has approved a maintenance plan. 

The Act also sets the general framework for maintenance plans'. Each PMIO 

maintenance plan must provide for continued maintenance of the PMIO standard for 

ten years after redesignation and includes the following components: 

1. Attainment emission inventory; 

1 Calcagni, John, Memorandum, Procedures for Processing Requests to Redesignate Areas to 

Attainment, Office of Air Quality Planning and Standards, Research Triangle Park, North Carolina, 

September 4, 1992. http://www.epa.qov/ttn/oarpq/t5/memoranda/redesianmem090492.pdf 
2. Maintenance demonstration; 

3. Commitment to continue the monitoring network operation; 

4. Commitment for verification of continued attainment; and 

5. Contingency plan to promptly correct any violation of the PMI 0 standard that 

occurs after the area has been redesignated. 

Ill. EVALUATION OF THE COSO JUNCTION PLAN 

Based on review of the Coso Junction PMIO Maintenance Plan and the District's 

supporting technical analysis, ARB staff concurs that the Plan meets the Act's 

requirements. The following sections describe the major elements of the Plan and the 

redesignation request. 

A. Coso Junction Attains the 24-Hour PMIO Standard 

PMI 0 is measured at one monitoring station in Coso Junction (Figure 1). A TEOM 

(tapered element oscillating microbalance) collects hourly PMIO samples at this site. 

The 24-hour standard is met when the estimated number of exceedances measured 

over a three year period averages one or less per year. Daily PMIO monitoring data 

collected at Coso Junction over the last 3 years has shown on average no more than 1 

exceedance of the PMIO standard per year as required to demonstrate attainment of 

the federal standard. Figure 1 illustrates the Coso Junction PMIO nonattainment area, 

monitor locations, and the area's close proximity to Owens Lake. 

Figure 1. PMlO Monitoring Stations in Coso Junction 
On three days over the 2007 to 2009 period, the 24-hour standard was exceeded due to 

high wind conditions that suspended fugitive dust from an unpaved parking area and 

from Owens Lake. The owner of the unpaved parking area was notified and the area 

was graveled in 2008 and surfaced with asphalt in 2009 to control fugitive dust. Table 1 

shows the maximum 24-hour concentration at the Coso Junction site between 2007 and 

2009 and average exceedance days, demonstrating attainment. 

.Table 1. Coso Junction PMIO Data from 2007 to 2009 

Monitoring 

1 Station 

B. The State Has Met Applicable Act Requirements 

ARB and the District have met all of the Act requirements applicable for a moderate 

PMIO nonattainment area to be considered for redesignation. Due to the clean data 

finding, this Plan will serve as meeting the requirement of an approved SIP. 

Observed Maximum 24-hour 

Concentration (uglm3) 

1 Coso Junction 

C. Improvement in Coso Junction's PMIO Air Quality is Due to Permanent and 

Enforceable Reductions in Emissions 

2008 

137 

2007 

283 

Coso Junction is an isolated area with a population of roughly 100 people. The main 

source of PMIO pollution in Coso Junction is transport of fugitive dust from the Owens 

Valley. In 1998, the Owens Valley SIP was adopted and approved by the U.S. EPA 

including a control strategy that required dust controls on 16.5 square miles of the 

lakebed. Under the Owens Valley SIP, the City of Los Angeles is responsible for 

mitigating the dust generated from Owens Lake in order to bring the area into 

attainment with the PMIO standard. (GBUAPCD, 1998) The Owens Valley SIP was 

revised in 2003 to expand dust controls to 29.8 square miles of the lake bed by 

December 31, 2006. The City of Los Angeles successfully implemented these control 

measures by the required deadline. 

24-Hour 

Exceedance Days 

In 2008, the Owens Valley SIP was amended to expand control requirements to a total 

of 43.1 square miles of the Owens Lake bed. The City of Los Angeles is expected to 

have dust control measures implemented on 39.6 square miles of the lakebed by 

April 1, 2010, and then to expand the control area to 43.1 square miles by 

October 1,2010. Overall, PMIO emissions from the Owens Lake bed have been 

reduced by 90% since 2000 when the City of Los Angeles initiated efforts to control 

windblown dust at Owens Lake. Thus, the improvement in Coso Junction is due to 

permanent and enforceable reductions. 

3-year Average 

Exceedance Days 

2009 

168 

2007-2009 

3 

2007-2009 

1 1 
2. Maintenance Demonstration 

Coso Junction is projected to maintain attainment with the PMIO standards due to ARB, 

District, and other State and local control measures already in.place. No significant 

growth or changes in the emission inventory are expected for Coso Junction through the 

year 2025. Thus, Coso Junction is expected to maintain the PMIO standard. In addition, 

regional PM10 emissions are projected to decrease even further in the future as a result 

of the additional controls on Owens Lake. 

3. PMIO Monitoring Network 

The District commits to continue PMIO monitoring to verify continued attainment of the 

PMIO standard. The existing PMIO monitoring network in Coso Junction includes a 

PMI 0 TEOM monitor located at the Highway 395 rest area in Coso Junction (Figure 1). 

Federal regulations require daily sampling at the site reporting peak PMIO 

concentrations. This real-time PMIO monitor meets this daily monitoring requirement. 

4. Verification of Continued Attainment 

To verify continued attainment of the PMIO standard, the District commits to continue 

daily PMIO monitoring at the Coso Junction rest area to help ensure new sources of 

PMIO are identified and controlled, if necessary. 

5. Contingency Plan 

The Act requires the maintenance plan to include contingency provisions for prompt 

correction of any PMIO standard violation that might occur after the area has been 

redesignated to attainment. The maintenance plan is not required to contain fully 

adopted contingency measures that will go into effect without further state action as is 

required in attainment SIPS. Instead, for maintenance plans, the area must have a plan 

to ensure that contingency measures are adopted once they are triggered. 

District staff believes the control strategy and contingency requirements in the 2008 

Owens Valley PMIO SIP are adequate to protect air quality in the Coso Junction area. 

Therefore, no additional contingency measures will be needed to ensure future 

compliance with the federal PMIO standard in Coso Junction. 
D. Maintenance Plan 

The Coso Junction PMIO Maintenance Plan includes the following components: 

emission inventory; commitment to continue monitoring network operation; commitment 

for verification of continued attainment; and contingency plan. 

1. Attainment Emission Inventory 

An emission inventory is a critical tool used to support evaluation, control, and mitigation 

of air pollution which is comprised of a systematic listing of the sources of air pollutants 

along with the amount of pollutants emitted from each source or category over a given 

period of time. Emission inventories are estimates of the air pollutant emissions 

released into the environment - they are not direct ambient concentration 

measurements. To determine the expected emissions in future years, emission 

inventories incorporate the effects of growth and existing regulations (baseline 

inventories). An attainment inventory identifies the level of emissions during the period 

when air quality data show attainment. 

The Coso Junction PMIO Maintenance Plan presents an updated 2009 attainment 

inventory of direct PMIO emissions split by source subcategory. lnventory updates 

include the latest point, area, and mobile source emissions for the Coso Junction. Total 

PMIO emissions are estimated at 1,427 pounds per day for the Coso Junction, which is 

less than 0.1% of the emissions caused by windblown dust from Owens Lake. In 

addition to the 2009 adjusted baseline PMIO emissions, the Coso Junction PMIO 

Maintenance Plan provides emission projections out to 2025. No significant growth or 

changes in the emission inventory are expected for Coso Junction through the year 

2025. 

Table 2. Coso Junction PM10 Emissions Inventory 

Daily PMlO Emissions for 2009 through 2025 

Stationary Sources I Poundslday 

California Lightweight Pumice ' China Lake Naval Air Weapons Station 

1 Total PMlO (pounds per day) 1,427 

167 

84 

Halliburton Services 

Twin Mountain Rock 

Area Sources 

Unpaved Roads 

Paved Roads 

Mobile Sources 

On Road Motor Vehicles 

20 

58 

33 

101 

12 

Coso Operating Company 953 
IV. STAFF RECOMMENDATION 

ARB staff has reviewed the PMIO Redesignation Request and Maintenance Plan for 

Coso Junction and consulted with District staff during this review. ARB staff finds that 

the Coso Junction PMIO Maintenance Plan meets all applicable Act requirements. ARB 

staff believes that implementation of this Plan will continue to maintain PMIO levels 

below the national air quality standard in Coso Junction. Therefore, we recommend that 

the Board adopt the Coso Junction PMIO Maintenance Plan as a revision to the 

California SIP for submittal to U.S. EPA. In addition, ARB staff recommends that the 

Board approve the District's request that Coso Junction be redesignated from 

"onattainment to attainment for the national PMlO standard.