# FINAL

2009 1997 8

- HOUR OZONE

MODIFIED AIR QUALITY MANAGEMENT PLAN AIR POLLUTION CONTROL

DISTRICT

JULY 13 , 2010FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

i



## TABLE OF CONTENTS

Chapter 1

– Introduction/Background

................................ ............................... 1

1. 1 Introduction

................................ ................................ ................................ 2 1.2 Purpose

................................ ................................ ................................ ...... 3 1.3 Background

................................ ................................ ................................ 3
1.4 Ozone Production and Health Effects

................................ ...................... 4 1.5 Responsibility of Agencies

................................ ................................ ....... 6

Chapter 2

– Planning Area

................................ ................................ .................... 9 2.1 Physical Description of the Planning Area

................................ .............. 1 0
2.2 Climate

................................ ................................ ................................ ........ 1 0 2.3 Atmospheric Stability and Dispersion

................................ ..................... 1 1
2.4 Land Use

................................ ................................ ................................ ..... 1 2 2.5 Population

................................ ................................ ................................ .. 1 2

Chapter 3

– Existing Air Quality

................................ ................................ ........... 1 3 3.1 Air Quality Standards

................................ ................................ ................ 1 4 3.2 Air Quality Monitoring

................................ ................................ ............... 1 5

3.3 Local Ozone Measurements

................................ ................................ ...... 1 8

Chapter 4

– Emission Inventory

................................ ................................ ........... 2 1
4.1 Introduction

................................ ................................ ................................ 22 4.2 Emissions Source Classification System

................................ ................ 23 4.3 2002 Baseline Inventory Categories

................................ ......................... 23

Chapter 5

– Control Measures

................................ ................................ ............. 2 8
5.1 Introduction

................................ ................................ ................................ 29
5.2 Control Measure Analysis

................................ ................................ ......... 29 5.3 Stationary Source Control Measures

................................ ....................... 30 5.4 Transportation Control Measures

................................ ............................ 36 5.5 Incentive Programs

................................ ................................ .................... 40 5.6 State Strategy

................................ ................................ ............................. 41

Chapter 6

– Emission Forecast

................................ ................................ ............ 43
6.1 Introduction

................................ ................................ ................................ 44 6.2 Forecast Methods and Assumptions

................................ ....................... 44

6.3 Ex ternal Adjustments to Emissions Inventory

................................ ........ 46

6.4 Emissions Inventory Forecast

................................ ................................ .. 47
6.5 Emissions Inventory Trends

................................ ................................ ..... 49

6.6 Transportation Conformity

................................ ................................ ........ 50

Chapter 7

– Conclusions and SIP Checklist

................................ ....................... 52 7.1 Checklist of SIP Requirements

................................ ................................ . 53FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

ii



## LIST OF APPENDI CES

APPENDIX A ( Approval and Promulgation of Air Quality

Implementation Plans; California Determination of
Attainment of the 1997 8

- Hour Ozone Standard )

..................... 5 6

APPENDIX B (NOx and ROG Detailed Emissions Inventory )

.......................... 59



## LIST OF TABLES

Table 1

- 1: Imperial County’s population at risk from Ozone exposure

............ 6

Table 2

- 1: Incorporated Cities in Imperial County (Population)

........................ 1 2
Table 3

- 1: California and Federal Ambient Air Quality Standards

.................... 1 5

Table 3

- 2: 8

- Hour Ozone Design Values at Each Monitor

................................ .. 2 0

Table 4

- 1: Emissions By Major Source Category 2002 Base Year Summer

Planning Emissions Inventory (tons/day)

................................ .......... 2 6
Table 5

- 1: Stationary Source Control Measures

................................ ................. 31
Table 5

- 2: CARB Adjustments to the Emissions Inventory Baseline

............... 3 4
Table 5

- 3: Regional Tran sportation Plan Transportation Control Measures

Project Categories

................................ ................................ ............... 3 8
Table 5

- 4: Imperial County CEQA Air Quality Handbook Transportation

Control Measures

................................ ................................ ................ 39

- 4 0
Table 5

- 5: CARL Moyer Program Reduction in 2007 (tpy)

................................ . 4 1
Table 6

- 1: CARB Adjustments to the Emissions Inventory Baseline

............... 47
Table 6

- 2: Motor Vehicle Growth Trends

................................ ............................. 4 8
Table 6

- 3: Emissions by Major Source Category 2009 Summer Planning

Inventory (tons/day)

................................ ................................ ............. 49
Table 6

- 4: Imperial County Summer Planning Emissions Inventory

Compa rison

................................ ................................ .......................... 49

- 5 0
Table 6

- 5: 2009 Imperial County VOC and NOx Budgets, tons per day

............ 5 1

Table 7

- 1: State Implementation Plan Checklist

................................ ................. 5 3

- 5 5



## LIST OF FIGURES

Figure 3

- 1: Imperial County Monitoring Site Location

................................ ....... 1 6 Figure 3

- 2 : Design Values for 2002 to 2009

................................ ........................ 19 Figure 3

- 3 : 4 th Highest 8

- Hr Averages Per Year 2000 to 2009

............................ 2 0 Figure 4

- 1: Emissions By Major Source Category: 2002 Base Year

–

Reactive Organic Gases

................................ ................................ .... 2 7 Figure 4

- 2: Emissions By Major Source Category: 2002 Base Year

–

Nitrogen Oxides

................................ ................................ .................. 2 7FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 1

– INTRODUCTION/BACKGROUND Page 1 of 6 3 

# CHAPTER 1

INTRODUCTION/BACKGROUND

1.1 INTRODUCTION

1.2 PURPOSE

1.3 BACKGROUND

1.4 OZONE PRODUCTION AND HEALTH EFFECTS

1.5 REPONSIBILITIES OF AGENCIESFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 1

– INTRODUCTION/BACKGROUND Page 2 of 6 3

CHAPTER 1

– INTRODUCTION/BACKGROUND

1.1 INTRODUCTION

On July 18, 1997, the United States Environmental Protection Agency (U .S. EPA) promulgated an 8

- hour o zone National Ambient Air Quality Standard (NAAQS) of 0.080 parts per million (ppm ) in order to promote greater protection of the public health by strengthening the already existing 1

- hour ozone standard. The new standard, hence
forth referred to as the 1997 8

- hour ozone NAAQS is therefore much more stri ngent than the previous 1

- hour o zone standard. With the p romulgation of the 1997 8

- hour

o zone NAAQS the U.S. EPA classified the Imperial County as a “Marginal” non

attainment area on April 30, 2004 this was in accordance with the provisions of the Clean Air Act (CAA). Subsequently, on F ebruary 13, 2008 the U.S. EPA found that the Imperial County failed to meet attainment for the 1997 8

- hour o zone NAAQS by the “Marginal” deadline of June 15, 2007. 1 As a result, Imperial County was reclassified as
a “Moderate” non

- attainment area for the 1997 8

- hour o zone NAAQS . Those areas classified under a “Moderate” classification are required to attain the standard “as expeditiously as practicable,” but no later than 6 years after designation or June 15, 2010. According to the CAA a sta te must provide for implementation of all control measures needed for attainment requiring the submittal of an attainment demonstration, a reasonable further progress (RFP) plan, contingency measures along with other planning requirements. Therefore, Impe rial County was required to develop a revised State Implementation Plan (SIP) by December 31, 2008.

On December 3, 2009 the U.S. EPA issued a final ruling determining that the Imperial County “moderate” 8

- hour ozone non

- attainment area attained the 1997 8

- hour NAAQS

for ozone (see Appendix A). The determination by U.S. EPA was based upon complete, quality

- assured and certified ambient air monitoring data for the years 2006 thru 2008. This determination effectively suspended the requirement for the stat e to submit an attainment demonstration, a RFP plan, contingency measures and other planning requirements for so long as Imperial County continues to attain the 1997 8

- hour ozone NAAQS . However, this determination did not constitute a re

- designation to

at tainment under the CAA section 107 (d)(3). Therefore, the classification and designation status for Imperial County remain as a “moderate” non

- attainment area of

the 1997 8

- hour ozone NAAQS . As such, Imperial County is then required to submit for
U.S. EPA approval a 2009 8

- H our Ozone “Modified” Air Quality Management Plan.

The 2009 8

- Hour Ozone “Modified” Air Quality Management Plan , hence forth referred to as the Modified AQMP, is a legal document that fulfills the stipulations contained

under Title 40 of the Code of Federal Regulations pertaining to the preparation, adoption and submittal of Implementation Plans.

Because Imperial County is currently in attainment of the 1997 8

- hour ozone NAAQS

1 Determination of Nonattainment and Reclassification of the Imperial County, 8

- Hour Ozone Nonattainment Area: Federal Register: February 13, 2008 (Volume 73, Number 30)FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 1

– INTRODUCTION/BACKGROUND Page 3 of 6 3 the Modified AQMP serves as a comprehensive planning document intended to provide guidance to the Air Pollution Control District, the County, and other local agencies on how to continue maintaining the 1997 8

- hour ozone NAAQS

. 2 The Modified AQMP

must incl ude at a minimum the following moderate area requirements: (1) Nitrogen Oxide ( NOx ) and Volatile Organic Compound ( VOC ) growth emission inventory, (2) a discussion on the implementation of RACT (40 CFR 51.912), and (3) NOx and VOC

emission offsets of 1.15 to 1 for major source permits (40 CFR 51.165(a)). For a complete detailed list of SIP requirements please review the Checklist of SIP requirements found in Chapter 7. As a bonus, several of the ozone control measures
described in the Modified AQMP also r educe PM 10 emissions.

1.2 PURPOSE

Clean air is a valuable and essential resource which affects many aspects of our daily lives. It is vital to our health and welfare, to the local agricultural economy, and to the esthetic beauty and quality of life enjoyed b y county residents. Because the capacity of

the air to absorb environmental contaminants is limited

, wise management must be practiced in order to avoid significant deterioration of the resource. At its core the CAA adopted the NAAQS to protect public he alth, vegetation, materials and to improve visibility. Continued compliance with the NAAQS can only be accomplished by developing, adopting and implementing a Modified AQMP that specifically address es those issues related to the continued compliance of th e 1997 8

- hour ozone NAAQS in a sound, reasonable and effective manner.

1.3 BACKGROUND

Since the 1977 amendments to the CAA, areas of the country that violated the NAAQS for a particular pollutant were formally d esignated as non

- attainment for that pollutant. With the 1990 amendments to the CAA, areas designated as non

- attainment for the 1

- hour ozone NAAQS were classified as to the degree of non

- attainment status, effectively adding a greater degree of accountability upon s tates. Five classification categories were created (§181 of the 1990 CAA). In increasing severity, these were marginal, moderate, serious, severe and extreme. Each classification retained a different attainment date which would guarantee further protection to the public health
and welfare. The classification of non

- attainment areas is accomplished by the determination of a design value.

As mentioned above, with the promulgation of the new ozone standard in June of 1997 a stricter standard of 0.080 parts p er million (ppm) averaged over 8 hours was implemented. A n exceedance of the 1997 8

- hour ozone NAAQS occurs when a monitor measures ozone above 0.084 ppm (per the rounding convention). Non

- compliance with the ozone NAAQS occurs when the calculated design v alue is greater than or equal to

0.08 5 ppm. The design value is calculated by arriving at an average of the annual

2 It is important to note, that Imperial County recorded three (3) years of complete quality assured ambient air quali ty monitoring data for the years 2006, 2007, and 2008 demonstrating attainment of the 1997 8

- hour ozone NAAQS.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 1

– INTRODUCTION/BACKGROUND Page 4 of 6 3 fourth highest daily maximum 8

- hour ozone value over a three consecutive year period per monitor. The highest monitor design value in a non

- attainment area determines its
classification.

1.4 OZONE PRODUCTION AND HEALTH EFFECTS

The intent of the CAA is to provide a level of protection to the nation’s public health and the environment. The measurement standard used by U.S. EPA in providing protec tion to the public and environment is known as the NAAQS. Utilizing sections 108 and 109 of the CAA the U.S. EPA set NAAQS for six criteria pollutants one of which is ozone. There are essentially two types of ozone, good ozone which is found in the upper atmosphere while bad ozone is found at ground level. With the implementation of the

1997 8

- hour ozone NAAQS U.S. EPA intended to protect the public health, including the health of "sensitive" populations such as asthmatics, children, and the elderly and to protect the public welfare, including protection against visibility impairment, damage to animals, crops, vegetation, and buildings. Children are at a higher risk from exposure to ozone, since they breathe more air per pound of body weight than adults and because children’s respiratory systems are still developing. Children also spend a considerable amount of time outdoors during summer and during the start of the school year (May

- September) when the highest ozone levels are recorded. Therefore, lawma kers understanding that the availability of scientific information is always changing provided a provision in the CAA which requires U.S. EPA to review the latest scientific information and standards every five years in order to make recommendations on rev isions to the
NAAQS.

OZONE

Ozone occurs in two layers of the atmosphere. The layer closest to the Earth's surface is the troposphere where ground

- level ozone is found. Ground

- level or “bad” ozone is not emitted directly into the air, but is formed by a complex series of chemical rea ctions involving NOx, the result of combustion processes, and reactive organic gases (ROG) in the presence of sunlight. Organic gases are also known as VOCs, which include many industrial solvents, toluene, xylene and hexane as well as the various hydrocar bons that are evaporated from the gasoline used by motor vehicles or emitted through the tailpipe following combustion.

Emissions from industrial facilities and electric utilities, motor vehicle exhaust, gasoline vapors, and chemical

solvents are some of the major sources of NOx and
VOC.

Bad Ozone. Ground

- level or "bad" ozone is an air pollutant that is harmful to the human respiratory function and is known to damage crops, trees and other vegetation. It is theFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 1

– INTRODUCTION/BACKGROUND Page 5 of 6 3 main ingredient of urban smog. At gro und level, ozone is of greatest concern during the summer months because strong sunlight and the hot weather result in harmful ozone

concentrations in the air we breathe. Essentially, i ts formation is promoted by strong sunlight, warm temperatures and win ds. High concentrations of ground

- level ozone tend to be a problem in Imperial County only during the hot summer months when these conditions frequently occur.

Good Ozone

. Ozone occurs naturally in the Earth's upper atmosphere

- 6 to 30 miles

above the Earth's surface

- where it forms a protective layer that shields us from the sun's harmful ultraviolet rays. Manmade chemicals are known to destroy this beneficial

ozone. An area where the protective "ozone layer" has been significantly depleted

- for example, over the North or South Pole is sometimes called "the ozone hole.” The United States, along with over 180 other countries, recognized the threats posed by ozone depletion and in 1987 adopted a treaty called the Montreal Protocol to phase out the production and use of ozone

- depleting substances. The U.S. EPA has established regulations to phase out ozone

- depleting chemicals in the United States.

Health Effects

. Repeated exp osure to ozone pollution may cause permanent damage to the lungs. Even when ozone is present in low levels, inhaling it triggers a variety of health problems. Although breathing impairment is the primary and most noticeable health effect, ozone, can cause chest pains, coughing, nausea, throat irritation, and congestion. It can also worsen bronchitis, heart disease, emphysema, and asthma, and reduce lung capacity. Asthma is a significant and growing threat to children and adults. Ozone can aggravate asthma, causing more asthma attacks, increased use of medication, more medical treatment and more frequent visits to hospital emergency clinics. Although breathing impairment is the primary and most noticeable health effect, symptoms of sore throat, nausea or dizz iness, coughing and headaches may occur in healthy individuals exposed to high ozone concentrations. If exposure to higher concentrations is of limited duration, most people can recover to their previous functioning level. However, recent studies have show n that routine exposure to lower concentrations of ozone can cause chronic lung damage in children, with permanent reductions in lung capacity of up to 50% measured.

Healthy people also experience difficulty in breathing when exposed to ozone pollution.

B ecause ozone pollution usually forms in hot weather, anyone who spends time outdoors in the summer may be affected, particularly children, the elderly, outdoor workers and people exercising outdoors. Children are most at risk from exposure to

ozone because they are active outside, playing and exercising, during the summertime when ozone levels are at their highest. Table 1

- 1 presents Imperial County’s population at risk from ozone exposure as of 2005 population.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 1

– INTRODUCTION/BACKGROUND Page 6 of 6 3 *Table 1

- 1 Imperial County’s popul ation at risk from Ozone exposure

GROUPS AT RISK POPULATION

Pediatric Asthma: 4,389

Adult Asthma: 8,365

Chronic Bronchitis: 4,614

Emphysema: 1,844

Cardiovascular Disease: 34,768

Diabetes: 7,963

Total Population: 160,301

Population Under 18: 47,295

Population 65 & Over: 16,478

* T able 1

- 1: 2005 Information provided by American Lung Association. www.stateoftheair.org/2008/states/california/imperial

- 06025.html

Environmental Effects

. Ground

- level ozone damages plant life and is responsible for an estimated 500 million dollars in reduced crop production in the United States each year.
O zone interferes with the ability of plants to produce and store food, making them more susceptible to disease, insects, other pollutants, and harsh weather. It damages the foliage of trees and other plants, ruining the landscapes of cities, parks and forests, a nd

recreation areas.

Ozone is also considered a serious threat to California agriculture and native vegetation due to its pervasive nature. Many sensitive plant species are known to suffer damage at
concentrations below human health standards. Ozone inter feres with photosynthesis by attacking leaves, causing them to yellow, develop dead areas and drop leaves early. Ozone stunts growth in many crop varieties, reduces yields, or causes esthetic damage which lowers market value. Many of the crops grown within this county are particularly sensitive to ozone injury, including orchard crops, lettuce and several other varieties of vegetation.

1.5 RESPONSIBILITIES OF AGENCIES

A gencies with direct and indirect interest in air quality which parti cipate in the planning

process as it pertains to the CAA are discussed below.

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY (U.S. EPA)

The U.S. EPA administers the CAA and other air quality related legislation. As a regulatory agency, U.S. EPA responsibilities include establishing national emission limits for major sources of air pollution; inspecting and monitoring emission sources, enforcing federal air quality laws, promulgating new regulations, providing financial and technical support for air quality resea rch and development programs , setting NAAQS and preparing guidance for and a ction on SIP’s to meet and/or maintain those NAAQS. Essentially, the U.S. EPA is required to take action on the California SIP. T he CaliforniaFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 1

– INTRODUCTION/BACKGROUND Page 7 of 6 3 SIP is comprised of plans developed at the regional or local level. Each of these plans is individually reviewed and approved by U.S. EPA prior to incorporation into the SIP

The U.S. EPA says that 146 million Americans live in counties where monitored air in 2002 was unhealthy because of h igh levels of principal air pollutants; that more than 160 million tons per year of emissions of criteria air pollutants were emitted into the air by cars, trucks, industrial facilities and utilities, small businesses and other sources; and that 124 metrop olitan areas are still considered "non

- attainment" for one of the six pollutants targeted by the CAA. Since the 1990 Amendments to the CAA which

instituted the classification process, there has been a vast improvement in the amount
of emissions of criteri a pollutants compared to 1970.

Clean Air Act Amendment s of 1990 (CAA)

Anticipated economic impacts were the primary component in the debate over the 1990

Amendments to the CAA which included the strengthening of the o zone and particulate

matter (PM) standards. Still, the CAA and new federal and state regulations are creating new markets for alternative fuels, pollution control equipment, and new services. Supporters believe that the economic value public

- health benefits resulting from the
CAA can be m easured in fewer sick days, hospitalizations, and deaths which more than
offset initial economic costs

.

U.S. EPA i s required to do the following:

1. The U.S. EPA will provide technical assistance to the state and local area in the development of an attainment plan.

2. The U.S. EPA will move quickly to review and act on completed plans after
submission of any revision to the SIP by the state.

3. Provided that the monitors in the area reflect attainment by the due date and the area submits an approvable m aintenance plan and re

- designation request, the U.S. EPA will move expeditiously to re

- designate the area as attainment and impose no additional requirements.

The 1990 Amendments also established a loc al air quality planning process , requiring
SIP ’s for e ach local area that had not attained a particular standard . These plans are to be prepared by local agencies and are to be incorporated into the SIP . The U.S. EPA was given power to impose sanctions for failure to submit a plan or carry out

commitments i n a plan. Sanctions could include offset sanctions and the withholding of federal highway funds.

CALIFORNIA AIR RESOURCES BOARD (CARB)

The California Air Resources Board (CARB) is the state agency responsible for the
coordination and administration of b oth state and federal air pollution control programsFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 1

– INTRODUCTION/BACKGROUND Page 8 of 6 3 in California. The CARB undertakes research, sets state ambient air quality standards (CAAQS) , provides technical assistance to local Air Pollution Control Districts, compiles emission inventories, devel ops suggested control measures, and provides oversight of Air Pollution Control District control programs.

A key function of CARB is to coordinate and guide regional and local air quality planning efforts required by the California Clean Air Act (CCAA), and to prepare and submit required SIP’s to U.S. EPA. CARB also establishes emission standards for motor
vehicles. The CAA allows California to adopt more stringent vehicle emission standards than the rest of the nation due to California’s severe air pollution problem.

IMPERIAL COUNTY AIR POLLUTION CONTROL DISTRICT (ICAPCD)

The Imperial County Air Pollution Control District (ICAPCD) shares responsibility with CARB for ensuring that all state and federal ambient air quality standards are achieved and maintained within the County. State law assigns to local Air Pollution Contro l Districts the primary responsibility for control of air pollution from stationary sources, while reserving an oversight role for CARB. Generally, the Air Pollution Control Districts must meet minimum state and U.S. EPA program requirements. The Air Pollu tion Control District is also responsible for the inspection of stationary sources, monitoring of ambient air quality, and planning activities such as modeling and maintenance of the

emission s inventory. As it pertains to this Modified AQMP the ICAPCD wil l:

1. Maintain the NOx and VOC growth emission inventory

2. Provide a discussion on the implementation of RACT (40 CFR 51.912)

3. Provide NOx and VOC emission offsets of 1.15 to 1 for major source permits (40 CFR 51.165(a)).FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 2

– PLANNING AREA Page 9 of 6 3 

# CHAPTER 2

PLANNING AREA

2.1 PHYSICAL DESCRIPTION OF THE PLANNING AREA

2.2 CLIMATE

2.3 ATMOSPHERIC STABILITY AND DISPERSION

2.4 LAND USE

2.5 POPULATIONFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 2

– PLANNING AREA Page 10 of 6 3 CHAPTER 2

– PLANNING AREA

2.1 PHYSICAL DESCRIPTION OF THE PLANNING AREA

Geographical Description

Imperial County extends over 4, 482 square miles in the southeastern corner of California. It is bordered on the south by Mexico, on the east by Arizona, on the west by the Coyote and Fish Creek Mountains (which are in San Diego County), and on the north by Riverside County. The Salton Tro ugh runs approximately northwest

- southeast through the center of the county and extends into Mexico. The elevation in Imperial County ranges from about 230 feet below sea level in the Salton Sea to the north to
more than 2800 feet on the mountain summits to the east.

2.2 CLIMATE

Winters are mild and dry with daily average temperature ranges between 65 and 75oF (18

- 24oC). During winter months it is not uncommon to record maximum temperatures of up to 80oF

. Summers are extremely hot with daily average temperature ranges

between 104 and 115oF (40

- 46oC). It is not uncommon, during summer months, to record maximum temperatures of 120o F

. The annual rainfall is just over 3 inches (7.5 cm) with most of it coming in late summer or midwinter.

Climat ic conditions in the Imperial County are governed by the large

- scale sinking and warming of air in the semi

- permanent tropical high pressure center of the Pacific Ocean. The high pressure ridge blocks out most mid

- latitude storms except in winter

when the high is weakest and farthest south. The coastal mountains prevent the intrusion of any cool, damp air found in California coastal environs. Because of the weakened storms and barrier, the Imperial County experiences clear skies, extremely hot summers, mild winters, and little rainfall. The flat terrain of the valley and the strong temperature differentials created by intense solar heating, produce moderate winds and deep thermal convection.

The combination of subsiding air, protective mountains and distance from the ocean all combine to severely limit precipitation. Rainfall is highly variable with precipitation from a single heavy storm exceeding the entire annual total during a later drough t condition.

The Imperial County enjoys a year

- round climate characterized by a temperate fall, winter and spring and a harsh summer. Humidity often combines with the valley's normal high temperatures to produce a moist, tropical atmosphere that frequent ly seems hotter than the thermometer suggests. The sun shines, on the average, more in the Imperial County that anywhere else in the United States.

2.2.1 Humidity

Humidity is low throughout the year, ranging from 28 percent in summer to 52 percent in

winter. The large daily oscillation of temperature produces a corresponding largeFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 2

– PLANNING AREA Page 11 of 6 3 variation in the relative humidity. Nocturnal humidity rises to 50

- 60 percent, but drop to about 10 percent during the day. Summer weather patterns are dominated by intense

heat ind uced low

- pressure areas that form over the interior desert.

2.2.2 Typical W eather P atterns

The wind directio n follows two general patterns. The prevailing winds are from the west

and northwest s easonally from fall through spring

. These originat ing prevailin g winds
are known to be from the Los Angeles area.

O ccasionally Imperial County experiences periods of extremely high winds speeds

. Wind speeds can exceed 31 mph occu r r ing most frequently during the months of April and May. However, speeds of less than 6.8 mph account for more than one

- half of the

observed wind measurements . Wind statistics indicate prevailing winds are from the

west

- northwest through southwest; a secondary flow maximum from the southeast is

also evident.

2.3 ATMOSPHERIC STABILITY AND DISPERSION

Air pollutant concentrations are primarily determined by the amount of pollutant emissions in an area and the degree to which these pollutants are dispersed in the atmosphere. The stability of the atmosphere is one of the key factors affecting pollutant dispersion. Atmospheric stability regulates the amount of vertical and horizontal air exchange, or mixing, that can occur within a given air basin. Restricted mixing and low wind speeds are generally associated with a high degree of stability in the atmosphere. These conditions are characteristic of temperature inversions.

In the atmosphere, air temperatures normally decrease as altitude increases. At varying distances above the earth's surface, however, a reversal of this gradient can occur. Th is condition, termed an inversion, is simply a warm layer of air above a layer of cooler air, and it has the effect of limiting the vertical dispersion of pollutants. The height of the inversion determines the size of the mixing volume trapped below. Inver sion strength or intensity is measured by the thickness of the layer and the difference in temperature between the base and the top of the inversion. The strength of the inversion determines how easily it can be broken by winds or solar heating.

Imperial County experiences surface inversions almost every day of the year. Due to strong surface heating, these inversions are usually broken allowing pollutants to be more easily disperse d . Weak, surface inversions are caused by radiational cooling of air

in co ntact with the cold surface of the earth at night. In valleys and low lying areas this condition is intensified by the addition of cold air flowing down slope from the hills and pooling on the valley floor.

The presence of the Pacific high pressure cell c an cause the air to warm to a temperature higher than the air below. This highly stable atmospheric condition, termed a subsidence inversion can act as a nearly impenetrable lid to the vertical mixing ofFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 2

– PLANNING AREA Page 12 of 6 3 pollutants. The strength of these inversions makes t hem difficult to disrupt. Consequently, they can persist for one or more days, causing air stagnation and the buildup of pollutants. Highest or worst

- case ozone levels are often associated with the presence of this type of inversion.

2.4 LAND USE

Since 1990, Imperial County's $1.6 billion dollar agricultural industry grew over 52% in

200 8

. Vegetable and melon crops led the county tally, g rossing more than $ 675 million followed by field crops (hay) which grossed $482 million. More than 40 types of crops

and commodities are grown in the Imperial County. This ranks Imperial County tenth among all California counties, and twelfth among all counties in the United States. Approximately one half a million acres of land are farmed in Imperial County and the
total fa rmable acres have remained fairly constant over the past decade. During th e high season, approximately 25% of Imperial County’s labor force work in the Agricultural Sector. Additionally, Imperial County has more acreage and production of alfalfa than

any o ther county in the United States. It is also a major producer of lettuce, feedlot beef, melons, carrots, Sudan grass hay, onions and numerous other commodities.

2.5 POPULATION

Growth has been a central part of local discussion for the past few years in the Imperial County. Table 2

- 1 below shows the population estimates for the larger incorporated

areas in Imperial County. In addition, the category “ Balance of County ” identifies the population estimates for the cities of Bombay Beach, Desert Shores, Heber, Niland, Ocotillo, Palo Verde, Salton City, Salton Sea Beach, Seeley, and Winterhaven. The increase in population is evident when one compares the populations for 1990 and

2007. Be tween 1990 and 2007 Imperial County increased its population by 62,200 new residents.

Table 2

- 1 * There are seven incorporated cities in Imperial County

IMPERIAL COUNTY 1990 2000 2001 2002 2003 2004 2005 2006 2007

Brawley 18,923 22,052 22,365 22,497 22,731 23,402 23,915 25,426 25,522

Calexico 18,633 27,109 28,049 29,783 32,014 34,256 36,079 36,651 37,295

Calipatria 2,690 7,289 7,280 7,612 7,651 7,791 7,884 7,819 7,750

El Centro 31,405 38,025 38,476 38,738 39,359 39,862 40,817 41,904 41,789

Holtville 4,820 5,612 5,674 5,694 5,710 5,726 5,715 5,832 6,257

Imperial 4,113 7,560 7,766 8,112 8,524 9,281 9,516 10,116 11,772

Westmorland 1,380 2,131 2,175 2,195 2,201 2,210 2,430 2,368 2,359

Balance of County 27,339 32,583 32,977 33,118 33,625 33,870 34,733 36,116 38,832

County Total 109,303 142,361 144,762 147,749 151,815 156,398 161,089 166,232 171,576

*Information provided by the Department of finance at www.dof.ca.govFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 3

– EXISTING AIR QUALITY Page 13 of 6 3 

# C HAPTER 3

EXISTING AIR QUALITY

3.1 AIR QUALITY STANDARDS

3.2 AIR QUALITY MONITORING

3.3 LOCAL OZONE MEASUREMENTSFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 3

– EXISTING AIR QUALITY Page 14 of 6 3 CHAPTER 3

- EXISTING AIR QUALITY

3.1 AIR QUALITY STANDAR D S

In 1970 Congress simultaneously created the U.S. EPA and passed the CAA creating a national campaign to maintain healthy air quality standards for the control of air pollution. The CAA was subsequently amended in 1990 which intensified the national air quality control efforts to clean up air pollution in the United States. The provisions within the 1990 amendments included the NAAQS for six common air pollutants, State attainment plans, vehicle emission standards, stationary source emission standards, permits, and enforcement provisions.

The U.S. EPA established the NAAQS w hich identify the impact to humans and to the environment. The primary standard is designated to protect human health while the secondary standard is designated to protect the public welfare and the environment. The CAA requires not only that the U.S. EPA establish the NAAQS but that the U.S. EPA periodically review and amend those standards as needed.

Over the past several decades, the federal government has set and periodically revised the NAAQS for pollutants that are of the greatest public health con cern. These standards encompass the most common varieties of airborne materials which can pose a health hazard. The NAAQS is expressed as a measure of the amount of pollutant per unit of air. Because these pollutants are found all over the United States tr ibal, state and local governments must comply with the CAA by meeting the NAAQS. As a consequence, pollutants with ambient standards remain the chief focus of air quality management activities around the nation.

At the state and national level, the proce ss of setting standards involves careful review of scientific studies which relate pollutant concentrations to public health and welfare.

These studies are used to establish the criteria on which the standards are based. Air quality standards are typically set at levels which provide a reasonable margin of safety and protect the health of the most sensitive individuals in the population. Pollutants for

which ambient standards have been established based on the criteria studies

mentioned above are known as 'criteria pollutants'. Criteria pollutants include ozone, carbon monoxide, nitrogen dioxide, sulfur dioxide, PM 10 (a general category of airborne particles 10 microns or less in diameter), PM 2.5 a specific particulate matter, and lead.
Different standards for these and other pollutants have been set by the federal and the California governments. California standards tend to be more restrictive than national

standards.

The California Clean Air Act (CCAA) requires Air Pollution Control Districts to use the more restrictive State standards when setting up new source review limits to achieve no

net increase. In ad dition, State law requires all D istricts that cannot demon strate
attainment of the State o zone standard to adopt all feasible measures to reduce ROG and NOx, the precursors to o zone. Beyond the tighter standards for the criteria pollutants listed below, California has also set standards for sulfates, hydrogen sulfide,FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 3

– EXISTING AIR QUALITY Page 15 of 6 3 vinyl chloride, and visibility

- reducing particles. The ambient air quality standar ds for each of these pollutants are shown in Table 3

- 1.



### Table 3

- 1 California and Federal Ambient Air Quality Standards

Pollutant Averaging Times California Standards Federal Standards

Concentration Primary Secondary

Carbon Monoxide 8

- hour 9 ppm (+10 mg/m 3 ) 9 ppm (10 mg/m 3 ) None

1

- hour 20 ppm (23 mg/m 3 ) 35 ppm (40 mg/m 3 ) None

Lead 30 Day

- Average 1.5 μg/m 3

--- --- Quarterly Average

--- 1.5 μg/m 3 Same as Primary

Nitrogen Dioxide Annual (Arithmetic Mean) 0.030 ppm (56 μg/m 3 ) 0.053 ppm (100 μg/m 3 ) Same as Primary

1

- hour 0.18 ppm (338 μg/m 3 )

--- ---

Particulate Matter (PM 10 ) Annual (Arithmetic Mean) 20 μg/m 3 Revoked Revoked

24

- hour 50 μg/m 3 150 μg/m 3 Same as Primary

Particulate Matter (PM 2.5 ) Annual (Arithmetic Mean) 12.0 μg/m 3 15.0 μg/m 3 Same as Primary

24

- hour

--- 35 μg/m 3 Same as Primary

Ozone 8

- hour 0.07 ppm (137 μg/m 3 ) 0.08 ppm * Same as Primary

1

- hour 0.09 ppm (180 μg/m 3 )

--- Same as Primary

Sulfur Dioxide (SO2) Annual (Arithmetic Mean)

--- 0.03 ppm (80 μg/m 3 )

----

24

- hour 0.04 ppm (105 μg/m 3 ) 0.14 ppm (365 μg/m 3 )

---

3

- hour

------- --- 0.5 ppm (1300 μg/m 3 )

1

- hour 0.25 ppm (655 μg/m 3 )

--- ---

* On January 19, 2010 the U.S. EPA filed a proposal to reconsider the existing ozone standard to a level of 0.060 to 0.070 ppm.

3.2 AIR QUALITY MONITORING

Imperial County began its ambient air monitoring in 1976; however, monitoring of ozone began in 1986 at the El Centro monitoring station. Since that time, monitoring has been performed by the ICAPCD, CARB and private industry. Ambient monitoring is typically performed either in locations representative of where people live and work. Air monitoring is performed to meet many objectives. These include determining compliance with air quality standards, identifying areas with the highest pollutant concentrations, evaluating pollutant transport, and as the basis of daily reports to the public in newspapers and television about air quality levels.

For most pollutants, continuous monitoring occurs 24 hours a day, usually for periods of many years at one location. Because of many years of continual monitoring, a baseline level has been established allowing for trends and progress towards air quality g oals to be identified. Air monitoring demands close attention by experienced technicians. Stringent quality assurance procedures for instrument operation and data validation are followed before monitoring data is included into the county's air quality reco rd. The monitoring network in this county has slowly but steadily expanded over the years, with total operational cost now estimated to exceed $ 100,000 annually.

The Imperial County ground level ozone is measured at 6 monitoring stations throughout th e County: Calexico East, Calexico Ethel Street, El Centro, Brawley,FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 3

– EXISTING AIR QUALITY Page 16 of 6 3 Westmorland, and Niland. Figure 3

- 1 shows the location of the six monitoring stations currently in operation in Imperial County.

In addition to the Imperial County monitoring stations, t hree ozone monitoring stations have similarly been located in Mexicali, Baja California, Mexico. This reflects the cooperative efforts between the US Government and that of the Mexican Government in attempting to clean the air in both Mexicali and Imperia l County. These stations were established to help identify cross

- border transport of pollutants and associated pollutant

precursors.

Air Quality measurements are collected and stored in a comprehensive air quality data base maintained by U.S. EPA. In add ition, CARB maintains a comprehensive air quality database that can be accessed through CARB’s webpage. Monitoring instruments and resulting data are routinely reviewed and audited by the CARB to ensure the integrity of
the data. The data from these monit oring stations can also help to identify cross

- border transport of pollutants and associated pollutant precursors.

* Figure 3

- 1 Imperial County Monitoring Site Location

*W. First Street is the nearest cross street for Westmorland

Calexico

- East

– The Calexico East monitoring station , run and maintained by the CARB, was installed in 1996. Located above sea level the absolute location is latitude 32° 40’ 27” and longitude 115° 23’ 28”. Its relative location is north of the U.S.

– Mexico

border in close vicinity to the Highway 7 Calexico/Mexicali checkpoint border crossing.

The site curr ently records measurements for o zone (O 3 ), CO, NO 2 , SO 2 , and PM 2.5, as well as surface wind speed and wind direction.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 3

– EXISTING AIR QUALITY Page 17 of 6 3 Calexico

- Ethel/Belcher

– The Calexico Belch er monitoring station formerly known as the Ethel monitoring station, run and maintained by the CARB, was installed in 1994. Located above sea level it has an absolute location of latitude 32° 40’ 34” and longitude
115° 28’ 59”. Its relative location is 1029 Belcher Street within the property boundary on the Southeast corner of the Calexico High School football field parking lot. To the north is located an athletic sports field used for football, baseball and track. The monitoring

station is surrounded by a suburban neighborhood directly to the south, southeast and southwest. Relative to the international border crossing the monitoring station is approximately 1.2 km directly north. The site is recording measurements for o zone (O 3 ), CO, NO 2 , SO 2 , PM 2.5 , PM 10, lead and toxics.

Calexico

- Grant

- The Calexico Grant monitoring station was installed in 1991 and its operation was discontinued in 2007. Located at sea level the Calexico Grant station had an absolute location of latitude 32° 40’ 26” and longitu de 115° 30’ 59”. Its relative location was 900 Grant Street, at the southwestern portion of the city of Calexico. Located behind the local City Fire Department the Calexico Grant monitoring station was surrounded by a suburban neighborhood directly to th e south, east and west. Farther to the South past the residences and skate park there lies the New River (approximately 0.2 km South), the Calexico International Airport (approximately 0.8 km South, Anza Road (slightly over 0.8 km South), and the Internat ional border to Mexico (approximately 1.2 km South.) Approximately 1.2 km to the Southeast of the monitoring station is a large (5 acre) unpaved lot on Anza Road that lies about 0.4 km from customs, on the U.S. side of the border t he Calexico

- Grant site r ecorded measurements
of o zone and PM 10

.

El Centro

- The El Centro monitoring station was installed in 1986. Located above sea level its absolute location is latitude 32° 47’ 32” and longitude 115°33’ 47”. Its relative
location is 150 South 9 th Street on t he roof of the ICAPCD building . The monitoring station is surrounded by governmental and commercial buildings. It is the first monitoring site north of the City of Calexico creating the south to north monitoring network for Imperial County. The El Centr o monitoring station is classified as urban with large agricultural areas to the East and West of the city’s boundaries. This site
records measurements for o zone (O 3 ), CO, NO 2 , PM 2.5 , and PM 10

.

Brawley

- The current Brawley monitoring station which was installed in 2003 as a new station replacing the old Brawley monitoring station installed in 1982 is located below sea level and has an absolute location of latitude 32° 58’ 42” and longitude 115° 32’ 21”. Its relative location is 220 Main Street atop the Imperial County courthouse in the middle of the city of Brawley surrounded by commercial buildings. Like other cities within Imperial County the City of Brawley is surrounded by agricultural lands to the east, north and the west. The Brawley station is the third furthest northerly station within the Imperial County monitoring network. This site records measurements for PM 2.5 , and

PM 10

.

Westmorland

- The Westmorland monitoring station which was install ed in 1994 commenced measuring o zone in 1998. Locat ed below sea level its absolute location isFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 3

– EXISTING AIR QUALITY Page 18 of 6 3 latitude 33° 1’ 57” and longitude 115° 37’ 25”. Its relative location is 570 Cook Street in

Westmorland. The site is the fourth most northerly station within the Imperial County monitoring network. It lies west of Brawley but southwest of Niland. Residential and agricultural areas lie within 10m and 400m of th e site. The site records both o zone (O 3 )

and PM 10 concentrations using a sampling inlet that is approximately 5m above ground

level.

Niland

- The Niland monitoring station was installed in 1996 and commenc ed measuring o zone in 1997. Located below sea level its absolute location is latitude 33° 12’ 49” and longitude 115° 32’ 43”. Its relative location is 7711 English road. It is adjacent to English Road which is an unpaved and lightly travelled road (approximately 100 vehicles per day). The monitoring site is surrounded by agricultural land to the south, southwest and southeast. A single residence exists to the west of the station across English R oad. The monitoring station is southeast of the Salton Sea and Riverside County. The Niland monitoring station is the most northerly site within the Imperial County monitoring network. The site records measurements for o zone (O 3 )

and PM 10

.

3.3 LOCAL OZONE M EASUREMENTS

Typically, pollutant levels at any one location vary widely over time. As a result, air monitoring produces highly diverse data sets which are difficult to characterize with a few simple numbers. Statistical descriptors of air quality data can range from simple averages and highest values to more involved indicators. The simplest measure, cited in the narrative below, is to note the highest levels observed at different locations each year. Maximum and average values are useful for evaluating co mpliance with established air quality standards and for defining the time periods when highest pollutant concentrations are most likely to occur. As such, they characterize only the most adverse air quality conditions measured during the year and are not r epresentative of more commonly occurring pollutant levels.

Due to the extensive and complicated nature of an exhaustive evaluation of the criteria pollutants monitored in Imperial County, this section evaluates only the most recent ozone data collected by our monitors and associated trends of compliance with the
NAAQS.

Air quality trend analysis is important in assessing pollutant levels, and is particularly useful for planning purposes. Trends are evaluated in this analysis using two indicators
of local ozone levels: the 4 th highest 8

- hour average concentration measured each year

and the design value for each year.

According to the U.S. EPA regulation, 40 CFR part 50, the primary and secondary 1997

8

- hour ozone standard is met when a given 3

- year avera ge of an annual fourth highest daily maximum 8

- hour average ambient air quality ozone concentration is less than or equal to 0.08 ppm (i.e., 0.084 ppm when rounding is considered ) . Simply put, ozone is measured hourly, known as hourly measurements at each monitoring site. From theFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 3

– EXISTING AIR QUALITY Page 19 of 6 3 hourly measurements

, 8

- hour averages are calculated per hour and per monitoring site. At each site, the highest daily 8

- hour average is identified and recorded as the

maximum 8

- hour concentration for that day. Thus, for any gi ven single year the fourth highest daily maximum 8

- hour average is identified and averaged over three years per

site. This 3

- year average is referred to as the design value. When the design value is less than or equal to 0.084 ppm at each monitor within the area, then the area is meeting the NAAQS ( see Figure 3

- 2 )

.

In addition, ambient air quality monitoring data for the 3

- year period must meet a data completeness requirement. The ambient air quality monitoring data completeness requirement is met whe n the average percent of days with valid ambient monitoring data is greater than 90 percent, and no single year has less than 75 percent of data completeness as determined in Appendix I of part 50.

Despite an approximate growth of 39.5% in the Imperial County, Air quality

, as it pertains to ozone

, has improved greatly in this region in recent years . Figure 3

- 3 demonstrates how the Imperial County’s air quality has improved dramatically since 2002, the base year for the 2009 Modified AQMP

. As mentioned in Chapter 1 t he U.S.

EPA made a determination based on the 2006

- 200 8 monitoring data that the Imperial
C ounty moderate 8

- hour ozone nonattainment area attained the 1997 8

- hour NAAQS

. To illustrate the downward trend in ozone concentration s

, F igure 3

- 3 shows the Highest

4 th 8

- hour average concentrations for the years 2000 thru 2009

. 0.040 0.045 0.050 0.055 0.060 0.065 0.070 0.075 0.080 0.085 0.090 0.095 0.100

2002 2003 2004 2005 2006 2007 2008 2009Parts Per Million

YEAR 

## Figure 3

- 2 Design Values for Each Year

Clx

- East

Clx

- Ethel

El Centro

Westmorland

NilandFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 3

– EXISTING AIR QUALITY Page 20 of 6 3 To further substantiate the progress towards attainment the ICAPCD ozone design value was at 30% above the standard more than 10 years ago (1995). Since that time ozone air quality has continued to improve and most recently in 2007 the design value

was less than 10% above the standard culminating in attainment with the 1 997 8

- Hour

ozone NAAQS in 2008

.

Table 3

- 2 shows 8

- hour O zone design values per year for each monitoring station. It

a lso demonstrates attainment of the 1997 8

- Hour NAAQS for the Imperial County.



### Table 3

- 2. 8

- hour Ozone Design Values at Each Monitor

Y ear Air Monitoring Stations

Calexico

Ethel Calexico

East El Centro Westmorland Niland

2000 0.088 0.075 NED NED NED

2001 0.100 0.092 0.083 0.068 0.079

2002 0.087 0.084 NED NED NED

2003 0.078 0.084 0.087 0.069 0.079

2004 0.068 0.078 0.085 0.073 0.078

2005 0.071 0.075 0.084 0.079 0.072

2006 0.074 0.076 0.085 0.085 0.073

2007 0.079 0.79 0 0.086 0.087 0.074

2008 0.080 0.079 0.082 0.082 0.075

2009 0.083 0.076 0.079 0.080 0.077

Note: N ED indicates that either a monitor was not established or validated data was incomplete 0.000 0.020 0.040 0.060 0.080 0.100 0.120

2000 2001 2002 2003 2004 2005 2006 2007 2008 2009Parts Per Million

Year 

## Figure 3

- 3 4th Highest 8 Hr Averages per Year

2000 to 2009

Calexico

- East

Calexico

- Ethel

El Centro

Niland

WestmorlandFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 4

– EMISSION INVENTORY Page 21 of 6 3 

# C HAPTER 4

EMISSION INVENTORY

4.1 INTRODUCTION

4.2 EMISSION SOURCE CLASSIFICATION SYSTEM

4.3 2002 BASELINE INVENTORY CATEGORIESFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 4

– EMISSION INVENTORY Page 22 of 6 3 CHAPTER 4

- EMISSION INVENTORY

4.1 INTRODUCTION

An emissions inventory identifies the sources of air pollution in a given region and quantifies their emissions. Inventories are used to track emission levels over designated time periods in order to help with the planning process in a given region or area. Inventories allow for the understanding of current emissions levels and the projection of future emission levels

. Effective contro l strategies cannot be developed without an understanding of the type and number of emission sources contributing to the air quality problem. This chapter describes the inventory and discusses how it is developed, while chapter 6 discusses how the baseline inventory is used to project inventories for future years.

In cooperation with CARB, the ICAPCD develops a complete emissions inventory every year for all sources in Imperial County. This chapter presents emissions that occurred in Imperial County dur ing the base year 2002. The U.S. EPA designates the 2002 inventory as the baseline for measuring progress toward attainment of the 8

- hour ozone NAAQS. Thus, a significant effort has g one into making this inventory as complete and as accurate as possible. The pollutants included in the emissions inventory are reactive organic compounds (ROG) and oxides of nitrogen (NOx), both precursors to ozone

formation.

The emissions from many types of sources change by season, time of day, or even day of the week, eit her because of changes in the activity level (usage or throughput) or in the emission rate. For example, passenger cars tend to be used more in the summer than in the winter because there are more daylight hours and more people are traveling.

Drivers are more likely to use air conditioners during the summer months while higher outdoor temperatures also increase the rate at which fuel evaporates from cars. Emissions from the passenger vehicle category are higher in the summer than in the

winter because bo th the activity levels and emission rates are higher.

Any strategy designed to mitigate air pollution in the Imperial County must consider this seasonal variation in ambient air quality. The Modified AQMP uses the “summer planning inventory,” which is a better representation of emissions because emissions which occur from May through October are when exceedances of the standard are more likely to occur. The 2002 summer planning inventory reports emissions in units of tons per day (tpd) and includes data for the pollutants ROG and NOx, the two precursors to ozone (Table 4

- 1). Although t he summer planning inventory forms the basis for maintaining compliance with the 1997 8

- hour ozone NAAQS and provides the basis for the emissions reduction strategies prese nted in C hapter 5 it is part of an overall emissions inventory assembled and maintained by CARB in the California Emission Inventory Development and Reporting System (CEIDARS) and the Californ ia Emission Forecasting and Planning Inventory System (CEFS).FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 4

– EMISSION INVENTORY Page 23 of 6 3 4.2 EMISSION SOURCE CLASSIFICATION SYSTEM

All reportable sources are categorized as either stationary or mobile. Stationary source categories are subdivided into point and area

- wide sources, depending primarily on their permit status, relative size and emission characteristics while mobile source categories are subdivided into on

- road and off

- road.

Stationary Sources

Point sources are generally larger commercial or industrial facilities that are required to have a District Permit to Operate. The point source category includes facilities such as factories, geothermal plants, rock quarries , and farming operations

.

Area

- Wide Sources

The area

- wide category includes aggregate point sources or facilities that are not inventoried individually, but are estimated as a group and reported as a single source category. These sources consist of categories associated with human activity and emissions that take place over a wide geographic area. Examples include pesticides, consumer products, and residentia l fuel combustion.

Mobile Sources

Mobile source categories consist of two subcategories: on

- road and off

- road. On

- road sources include passenger cars, school buses, and trucks. CARB’s most recent mobile source Emission Factors model, EMFAC2007, is use d to calculate emission rates from all motor vehicles, such as passenger cars to heavy

- duty trucks, operating on highways, freeways and local roads in California. EMFAC2007 uses Department of Motor Vehicle (DMV) registration data for the number of vehicle s, Southern California Association of Governments (SCAG) travel demand output model for the number of vehicle miles traveled, Bureau of Automotive Repair (BAR) odometer readings and emission factors from vehicle surveillance programs and dynamometer readin gs.

Off

- road sources are generally regulated at the state or federal level and consist of aircrafts, trains, and off

- road recreational vehicles. The off

- road emissions inventory is generated by the CARB OFFROAD Model, which uses source population, activi ty, and emissions data to estimate emissions for each type of off

- road equipment. The model provides emission estimates for all off

- road vehicles, including boats, outdoor recreational vehicles, industrial and construction equipment, farm equipment, lawn and garden equipment, aircraft, and trains.

4.3 2002 BASELINE INVENTORY CATEGORIES

This section provides a brief description of the major emission inventory categories. The major sources are grouped according to either the stationary source or mobile source category. Within each category, the sources are further classified according to theFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 4

– EMISSION INVENTORY Page 24 of 6 3 appropriate activity, such as the burn ing of fuel or the process ing of petroleum. However, it is not uncommon to find different source types at the same facility. Thus, a n individual company’s emission inventory may be divided among two or more source categories. The major source category discussion and tables are based on the emissions inventory data obtained from the summer planning emissions inventory.

Table 4

- 1 summar izes the 2002 planning emissions inventory by major source categories. A detailed breakdown of NOx and ROG emissions from 2002 through 2023 by source category is presented in Appendix B . The baseline inventory, including future year projections, reflects the regulations adopted as of December 31, 2006. A list ing of
IC APCD and CARB rules and regulations that are reflected in the baseline inventory
can be found in Chapter 5.

Fuel Combus tion: This category includes sources that burn fuel such as natural gas

and diesel as a matter of operations or to produce useful heat. Combustion processes are a significant source of NOx emissions due to the oxidation of nitrogen in the fuel and

in the combustion of air. Examples of sources in this category are electric utility boilers, process heaters, internal combustion engines, home furnaces, and orchard heaters. Emissions from this source category represent 9.5% of the NOx emissions and 0.32%

of t he ROG emissions in the 2002 summer planning emissions inventory.

Managed Burning and Disposal: The emission inventory data for this activity is reported in the Miscellaneous Processes source category. The burning of agricultural waste can generate consid erable quantities of ROG, CO and PM 10 because of the incomplete

combustion process

. Reports indicate that the majority of the reported emissions are a

r esult of the open burning of wheat straw and Bermuda grass. Other sources represented in this category include residential burning, open burning of agricultural and residential tree pruning, and range improvement burns. Waste burning generates approximately 2.32 tpd or 6.2% of the ROG emissions in the summer planning emissions inventory.

Solvent Use: Or ganic solvents are used in a wide variety of industrial processes and are ingredients in numerous household and commercial products. The major concern here is that most solvents volatilize as ROG, which then becomes available to form ozone Example catego ries are dry cleaning, degreasing, asphalt paving, architectural coatings, and printing operations. These sources are responsible for approximately 24.14% of the ROG emissions in the summer planning emissions inventory.

Petroleum Production and Marketing: Emissions represented in this category result from the petroleum industry (petroleum pumping stations, truck loading and unloading.) Other activities include retail and commercial gasoline marketing and combustion related emissions that do not qualify f or the Fuel Combustion category above. This source category accounts for 1.7% of the ROG emissions in the 2002 summer planning inventory.

Industrial Processes: The sources and activities included here primarily emit PM 10 andFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 4

– EMISSION INVENTORY Page 25 of 6 3 ROG . Examples are feed and grain mills, rock quarries, sand and gravel operations, and concrete batch plants. The ROG emissions from this group of sources represent approximately 0.2% of the ROG emissions in the 2002 summer planning emissions inventory.

Mi scellaneous Processes: This category contains stationary source emissions which cannot be classified into those source groups already described. Included is the organic portion of both commercial and residential pesticide emissions. These sources

combin ed are responsible for approximately 32 % of the ROG in the summer planning emissions inventory.

On

- Road Motor Vehicles: This category is divided into vehicle types ranging from motorcycles to heavy duty trucks. Motor vehicle emissions occur both from c ombustion of fuel in the engine and from evaporation of fuel in the gas tank. This category represents a major portion of the ROG and NOx emissions in Imperial County, contributing approximately 54% of the NOx and 24% of the ROG in the 2002 summer plannin g emissions inventory.

Off

- Road Mobile Sources: Included here are moving sources of air pollution that do not use paved roads. Examples are trains, boats, aircraft, off

- road recreational vehicles, farm vehicles, and construction equipment. Some sources such as motorcycles can travel both on and off the road, but only emissions resulting from the latter activity are in this section. Emissions from these source types represent approximately 34% of the NOx and 17% of the ROG in the summer planning emissio ns inventory.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 4

– EMISSION INVENTORY Page 26 of 6 3 One aspect of the summer planning inventory that is not readily apparent is that it does not include emissions from natural sources such as wildfires and biogenic emissions (organic compounds emitted from trees and plants) that are beyond the Air District’ s control.

It is important to note that emissions for some source categories can vary from one ozone season to the next, while other sources may generate emission s at a relatively stable rate over an extended period. However, because the number of facilities that produce significantly variable emissions is low, there is not enough of an impact by these emissions to cause significant variances in the inventory. Con sidered as a whole, the effect of these fluctuations by individual facilities or source groups is largely muted by the substantial number and diversity of sources and by the volume of emissions generated each year. Because the 2002 emissions inventory is representative of the average emissions that occur during the summer planning period the use of the 2002 emissions inventory as the baseline emissions year is therefore appropriate for planning

purposes. Table 4

- 1 Emissions By Major Source Category 2002 Base Year Summer Planning Emissions Inventory (tons/day)

Source Category ROG %

Total NOx %

Total Stationary Sources

Fuel Combustion 0.12 0.32 3.57 9.54 Waste Disposal 0.02 0.05 0.00 0.00 Cleaning and Surface Coatings 0.42 1.13 0.00 0.00 Petroleum Prod. and Marketing 0.65 1.74 0.00 0.00

Industrial Processes 0.07 0.19 0.03 0.08 Total Stationary Sources 1.28 3.43 3.60 9.62

Area

- wide Sources

Solvent Evaporation 9.01 24.14 0.00 0.00

Miscellaneous Processes 11.81 31.65 0.92 2.46

Total Area

- Wide Sources 20.82 55.79 0.92 2.46
Mobile Sources

On

- Road Vehicles 8.77 23.50 20.21 53.99

Off

- Road Vehicles 6.45 17.28 12.70 33.93

Total Mobile Sources 15.22 40.78 32.91 87.92

Total for Imperial 37.32 100.00 37.43 100.00FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 4

– EMISSION INVENTORY Page 27 of 6 3 The 2002 summer planning emissions inve ntory is graphically displayed in Figures 4

- 1

and 4

- 2.

Stationary Sources

3.4%

Area Wide Sources

55.8% On

- Road Vehicles
23.5% Off

- Road Vehicles

17.3% Figure 4

- 1 Emissions By Major Source Category: 2002 Base Year

- Reactive Organic Gases

Stationary Sources

9.6% Area

- Wide Sources

2.5%

On

- Road Vehicles
54.0% Off

- Road Vehicles

33.9% Figure 4

- 2 Emissions By Major Source Category: 2002 Base

Year

- Nitrogen OxidesFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 28 of 6 3 

# C HAPTER 5

CONTROL MEASURES

5.1 INTRODUCTION

5.2 CONTROL MEASURE ANALYSIS

5.3 STATIONARY SOURCE CONTROL MEASURES

5.4 TRANSPOR T ATION CONTROL MEASURES

5.5 INCENTIVE PROGRAMS

5.6 STATE STRATEGYFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 29 of 6 3 CHAPTER 5

– CONTROL MEASURES

5.1 INTRODUCTION

The ICAPCD has the primary responsibility, under legislative authority, for regulating emissions from stationary sources as well as from some area sources found within the county. Currently, state and federal regulation prohibit the implementation of mobi le source regulation by local air districts.

At the state level, the CARB is responsible for regulating on

- road motor vehicles, some
off

- road mobile sources, consumer products as well as setting motor vehicle fuel specifications in California. At the fe deral level, the U.S. EPA traditionally regulates emission sources related to interstate commerce such as locomotives, aircraft, heavy

duty trucks and some off

- road engines which are either exempt from state authority or are best regulated at the national level. Both the local and the combined state and federal component, together address the majority of the sources impacting air quality in Imperial County. 3 The ICAPCD recognizes that any maintenance of the NAAQS will depend largely on the current and prop osed mobile source strategies under the state and federal jurisdictions.

The intent of this chapter is to provide the reader with an explanation of the existing

control measures which are an integral part of the Modified AQMP. Essentially, t he

control measures are a compilation of regulations which address how the Imperial County currently controls the emissions of Reactive Organic Gas compounds (R OG’s) and Nitrogen Oxides (NOx) within the moderate non

- attainment area. Because mobile

sources are a major contributor of ozone precursors this chapter dedicates a section to

the regulations as adopted by the CARB. This chapter endeavors’ to provide the reader with an analysis of the currently existing control measures and endeavors’ to

demonstrat e how these control measures control ROG and NOx emissions as required by the CAA. Included in the discussion is a recap and assessment of the State strategy as a vital component of the Modified AQMP. Since, the l ate 1970’s and early 1980’s the

ICAPCD ha s been committed to bringing major and non

- major stationary sources under regulation for the effective control of precursor emissions.

5.2 CONTROL MEASURE ANALYSIS

The Modified AQMP control measures consist of three components: 1) the ICAPCD’s Stationary Source Control Measures; 2) Regional Transportation Control Measures; and 3) the State Strategy. These measures primarily rely on the traditional command and control approach and as such provide the framework for ICAPCD rules that reduce
ROG a nd NOx emissions.

3 Although the Imperial County is currently in attainment of the 1997 8

- hour ozone NAAQS, it is important to note that any future analysis of air emissions impacting Imperial County must take into consideration the influence of transport from three distinct sources, that of the South Coast Air Quality Management District (SCAQMD) via the Coachella Valley to the north, the San Diego Air Pollution Control District to the west and the international city of Mexicali, Mexico to the south.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 30 of 6 3 5.3 STATIONARY SOURCE CONTROL MEASURES

This section provides a general overview of the current control measures as they apply to Imperial County. Currently adopted measures are represented as part of the most recently adopted rule book and represent ROG and NOx control measures adopted as part of the commitments contained in the previously approved 1991 Air Q uality Attainment Plan (AQAP). The control measures discussed herein contain either or both Reasonably Available Control Measures (RA CM) and/or Reasonably Available Control Technology. Although demonstrating the implementation of RACM is not a requirement for this Modified AQMP the ICAPCD finds it beneficial to explain how RACM is obtained through the adoption of RACT. RACM are non

- te chnological measures which have
been defined as cost

- effective at reducing emissions. RACT are measures established by the U.S. EPA which have been scientifically proven techniques and/or equipment

add

- ons that can be applied to certain stationary sources to reduce ozone precursor
emissions of ROG and NOx. These RACT measures are found within Control Technique Guidance (CTG) documents published by the U.S. EPA. As a result, the control measures adopted and implemented in Imperial County represent the imp lementation of all feasible control measures through the application of available technologies and management practices, as well as development and implementation of advanced technologies and control measures. Specifically, s tationary source control

measu res are equipment and techniques for reducing air pollutant emissions from stationary sources. The stationary source control measures presented in the Modified
AQMP are those measures representing emissions from both point sources (permitted facilities) a nd area sources (gen erally small and non

- permitted) and have been found sufficient in maintaining the 1997 8

- hour ozone NAAQS.

5.3.1 Control Measures with Emission Reductions Beyond 2002

The CAA requires that emission inventories be adjusted to reflect rule ef fectiveness. The baseline and future emission inventories have been adjusted to reflect applicability
of the control measures described below. Table 5

- 1 below demonstrates the most current stationary source control measures which were evaluated and subsequently found to be sufficient in maintaining attainment of the 1997 8

- hour ozone NAAQS.

Table 5

- 1 also represents the modifications to the summer plann ing inventory as a result of the implementation of these measures. The ICAPCD is committed to continued implementation of these control measures.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 31 of 6 3 Table 5

- 1
STATIONARY SOURCE CONTROL MEASURES

Emission Effective Emissions Inventory Code TITLE Year Reductions (EIC) Implemented (tpd)

520

– Architectural Coatings ICAPCD Rule 424, Architectural Coatings, Updated on 02/23/2010 2010 0.49 tpd of
ROG

620

- 618

- 0262

- 0101, Farming Operations, Dairy Cattle ICAPCD Rule 217, Large
Confined Animal Facilities Permits Required, Adopted
on 10/10/2006 2007

- 2009 5.2 tpd of
ROG

620

- 618

- 0262

- 0101, Farming Operations, Range Cattle ICAPCD Rule 217, Large
Confined Animal Facilities Permits Required, Adopted
on 10/10/2006 2007

- 2009 0.04 tpd of
ROG

620

- 618

- 0262

- 0101, Farming Operations,

Feedlot Cattle ICAPCD Rule 217, Large
Confined Animal Facilities Permits Required, Adopted
on 10/10/2006 2007

- 2009 1.6 tpd of
ROG

ICAPCD Rule 400.1, Stationary Gas Turbines (RACT) 2010 No Impact

ICAPCD Rule 400.2, Boilers,
Process Heaters and Steam Generators (RACT) 2010 0.39 tpd of
NOx

C

- 424 Architectural Coatings (Amendment)

Architectural coatings are products that are applied to stationary structures and their accessories. They include house paints, stains, industrial maintenance coatings, traffic coatings, and many other products. Architectural coatings represent a signifi cant source of VOC emissions throughout California. When these coatings are applied, VOCs are emitted from the coatings and from solvents that are used for thinning and

clean

- up. The ICAPCD updated its Architectural Coatings Rule according to the 2007
Su ggested Control Measures (SCM) developed by CARB. The new revisions to the Architectural Coatings Rule are to enhance the effectiveness of the SCM in obtaining
ROG emission reductions.

The baseline for determining emission reductions is the 2004 data f rom CARB’s survey. For architectural coatings, the 95 tpd of statewide VOC emissions are apportioned to

ICAPCD ’ s based on population. The SCM is intended for districts outside of the South Coast AQMD. In addition, emission reductions are only calculated for large containers, because small containers (one liter or less) are exempt from the proposed VOC limits.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 32 of 6 3 Amendment Adoption: 2010 Applicable ICAPCD Rule: 424
Cost

- Effectiveness: Individual limits range from a net savings to a net cost of $ 13.90

per pound of VOC reduced. However, the overall average cost

- effectiveness of the proposed limits is estimated to be $1.12 per pound of VOC reduced. Year 2010 ROG Emission Reduction: 0.49 tpd

C

- 217 Large Confined Animal Facilities Permits Required

In accorda nce with Senate Bill 700 (SB700)

– Florez

– Agricultural Sources, on November 10, 2006, the ICAPCD adopted Rule 217

– Large Confined Animal Facilities (LCAF) Permits Required. Rule 217 requires that all LCAFs, including beef feedlots and dairies, apply for and obtain an Authority to Construct/Permit to Operate which includes a mitigation plan for which the LCAF implements in order to reduce VOC emissions. Any permit that is issued to a LCAF is subject to all pertinent provisions of the California
Health & Safety Code and the ICAPCD Rules and Regulations. Rule 217 is currently being implemented and targets reductions of VOC and NH 3 emissions. Rule 217 requires compliance with RACT by providing a menu of mitigation measures for beef feedlots and dairies which comply with RACT measures.

Adoption: 2006 Applicable ICAPCD Rule: 217
Cost

- Effectiveness: For dairies (3 in Imperial County) the cost effectiveness is $17,800 per ton of VOC r educed while Beef Feedlots (approximately 26) have a cost effectiveness of $14.00 per ton of VOC reduced. Year 2010 ROG Emission Reduction: 6.84 tons per day

C

- 400.1 Stationary Gas Turbines

Rule 400.1 was adopted to address RACT requirements. Essentially, Rule 400.1 imposes RACT upon any unit with a rated heat input capacity of 1 Megawatt (MW) or more. The rule establishes NOx limits of 42 parts per million by volume (ppmv) for gaseous fuel

- fired units and 65 ppmv liquid fuel

- f ired units. The rule does not require the use of emission control technologies which might degrade or endanger the environment upon existing units. Rule 400.1 affects seven stationary gas turbines at four Imperial County major source facilities. These f acilities already substantially comply with the specified thresholds imposed upon by this rule, so no significant changes in current Authority to Construct or Permit to Operate conditions are anticipated. Since, all existing emission units affected by Rul e 400.1 are able to comply without additional installation of technology a substantial change, resulting from the implementation of this rule, in the emissions inventory for these facilities is not anticipated. The staff report contains a more

detailed an alysis on the impact and cost effectiveness associated with the implementation
of the rule.

Adoption: February 23, 2010 Applicable ICAPCD Rule: 400.1FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 33 of 6 3 Cost

- Effectiveness: Four major source facilities were affected in Imperial County by the adoption of this rule. The cost

- effectiveness for the natural gas unit is $61,731 per ton of NOx and for the diesel units the cost effectiveness is $44,839 per ton of NOx Year 2010 NOx Emission Reduction: No Impact

C

- 400.2 Boilers, Process Heaters and Steam Generators

Like Rule 400.1, Rule 400.2 was adopted to address RACT requirements. Essentially, Rule 400.2 applies RACT to any unit with a rated heat input capacity of 5 million British thermal units per hour (MMBtu/hr) or more. The rule imposed a NOx limit of 30 pp mv (0.036 lb/MMBtu) for gaseous fuel

- fired units and 40 ppmv (0.052 lb/MMBtu) for liquid
fuel

- fired units. The 30 ppmv gaseous

- fuel limit is generally achievable via combustion

controls such as low

- NOx burners, oxygen control, staged combustion, and flue gas recirculation. The 40 ppmv non

- gaseous fuel limit is achievable using combustion controls and low nitrogen content "clean" fuels, or by u sing post

- combustion controls. In addition, Rule 400.2 established an alternative NOx emission limit of 70 ppmv f or those emission units with an annual capacity factor of 30% or less. This alternative emission threshold was established for those peaking or seasonal emission units for which installation of advanced control technology would not have a significant impa ct in reducing NOx emissions. The rule similarly contains an alternative NOx threshold for biomass boilers equivalent to 120 ppmv at 12% CO 2 or as an alternative biomass boilers will be required to reduce NOx emissions at a minimum of 89% of the uncontrol led NOx emission concentration in the exhaust gas stream. Rule 400.2 affects several industries and businesses in Imperial County including some of our major source facilities.

Adoption: February 23, 2010 Applicable ICAPCD Rule: 400.1
Cost

- Effectiveness : The cost

- effectiveness ranged between the models for each impacted boiler. However on the average for a 50 MMBtu/hr, 100 MMBtu/hr, 150
MMBtu/hr and a 200 MMBtu/hr the cost

- effectiveness is approximately $74,700, $108,300, $124,900 and $148,200 respectiv ely. Year 2010 NOx Emission Reduction: Approximately 143.3 tpy

5.3.2 External Adjustments to the Emissions Inventory

The “external adjustments” listed in Table 5

- 2 describe the recent adjustments
accounted for external modifications to the CARB CEFS v1.06 Summ er Planning Inventory. The adjustments incorporate the most recent data changes to the emissions inventory identified by CARB specific to Imperial County. The Modified AQMP emissions inventory was modified to incorporate changes tha t occurred between 200 2

and 200 9

.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 34 of 6 3 Table 5

- 2
CARB ADJUSTMENTS TO THE EMISSIONS INVENTORY BASELINE

Emission Effective Emissions Inventory Code Description Year Reductions (EIC) Implemented (tpd)

050

- 995

- 0110

- 0000, Fuel Combustion, Manufacturing and Industrial, Other, Natural

Gas NOx summer emissions

were reduced based on updated natural gas data from the CA Energy
Commission. 2002

- 2009 4.7 tpd of
NOx in 2002 and 5.2 tpd
NOx in 2009

060

- 995

- 0110

- 0000, Fuel Combustion, Services and Commercial, Other,

Natural Gas NOx summer emissions

were reduced based on updated natural gas data from the CA Energy
Commission. 2002

- 2009 0.3 tpd of
NOx in 2002

and 2009

530, Pesticides/Fertilizers ROG emissions were

reduced based on 2004 pesticide emissions inventory data provided by the Department of Pesticide Regulation. 2002

- 2009 0.14 tpd
ROG in 2002

and 0.33 tpd
ROG in 2009

5.3.3 Reasonably Available Control Measures

Stationary source control measures rely on a variety of control technologies and management practices and as such the ICAPCD is seeking all feasible control

measures that will aid in maintain ing compliance with the federal and state standards. CAA sections 172(c)(1) and (c)(2) req uires ozone non

- attainment areas to submit a plan which contains provisions for the implementation of all RACM as expeditiously as practicable

. Although, RACM is not required for this Modified AQMP it is beneficial to explain that RACM applies to stationa ry source control measures and tr ansportation

control measures and that t he ICAPCD has nonetheless met the RACM requirements for stationary sources as demonstrated through the 2009 RACT SIP Report,

summarized below.

Reasonably Available Control Technology

Ozone non

- attainment areas are required by sections 182(b)(2) and 182(f) of the CAA to implement RACT for sources which are subject to CTG documents and for those major sources of ROG and NOx. RACT is defined as the lowest emissions limitation that a pa rticular source is capable of meeting by the application of control technology that is reasonably available considering technological and economic feasibility (44 FR 53762; September 17, 1979). In essence RACT requirements, as specified in the CAA,

assure that major sources of ozone precursor emissions are controlled to a “reasonable” extent, but not necessarily to the more stringent best available control technology (BACT) or maximum achievable control technology (MACT) levels, expectedFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 35 of 6 3 for new or modifie d existing major stationary sources. CTGs are EPA documents that define RACT for existing sources of air pollution.

Reasonably Available Control Technology (RACT) State Implementation Plan (SIP)

.

As part of the implementation process described in U.S. EPA’s Fina l Rule to Implement

the 8

- Hour o zone NAAQS (70 FR 71612; November 29, 2005) a RACT demonstration is required of all areas classified as a moderate or hig her ozone non

- attainment area. In order to accomplish the RACT demonstration ICAPCD staff r eviewed the list of CTG documents and compared them to existing rules and existing stationary sources. For each source category ICAPCD staff identified existing sources and applicable rules. This was accomplished by reviewing and researching the permit s ystem, the phone book, internet and the emissions inventory. The criteria used for the evaluation and determination of the RACT SIP rules were based on 1) U.S. EPA rule approval and 2) RACT/BARCT determinations issued by CARB. 3) Comparison to other Mode rate non

attainment areas. A ll CTG sources and major non

- CTG sources under ICAPCD jurisdiction are controlled to RACT or better

. Base d on its review, the ICAPCD made a determination that all ozone precursor rules fulfill RACT requirements for the 1997 8

- hour ozone NAAQS. In addition, with the adoption of Rules 400.1 and 400.2, the ICAPCD believes it not only fulfills VOC requirements but NOx requirements as well.

The ICAPCD intends to adopt its RACT SIP in conjunction with this Modified AQMP and

send bo th documents to CARB for submittal to the U.S. EPA.

5.3.4 New Source Review

New Source Review (NSR) is a permitting process required by the CAA to help ensure that any new or modified equipment and facilities (i.e. boilers, turbines, crude oil storage tanks, power plants and factories) do not significantly degrade air quality or slow progress towards clean air. The ICAPCD rule which dictates the NSR requirements is the NSR rule 207. There are two primary components of NSR, the application of BACT and emissi on offsets. BACT plays a very important role in helping the ICAPCD to meet the no net increase in emissions required by the CAA by acting as an emissions limitation on pollutants emitted from or resulting from any new or modified stationary source. Emissi ons reduction credits (ER C’ s) are credits which are issued to sources that have reduced their emissions in excess of what is required by

law. These emission reductions are banked and made available for offsetting emission growth from new or modified emis sions units.

BACT is currently required for all new or modified emission units which have a potential to emit of 25 pounds per day or more of any non

- attainment pollutants. New or modified sources with potentials to emit of 137 pounds per day of NOx an d ROG will be required to offset those emissions through the use of ERC’s. The se reductions must be permanent, real, enforceable, quantifiable and surplus.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 36 of 6 3 There are two versions of NSR rule that are enforced by the ICAPCD. A current version adopted as an amendment by the ICAPCD Air Board on October 10, 2006 and a SIP

approved rule version of Rule 207, Standards for Permit to Construct, approved on November 10, 1980. Both versions of Rule 207 fulfill the requirements of CAA Sections 172(c)(4 ) and (5), 182(a)(2)(C) and the 1.15 to 1 offset ratio required by Sections 182(a)(4) and 182(b)(5).

5.4 TRANSPOR T ATION CONTROL MEASURES

The largest source of ROG and NOx emissions for the summer planning inventory are by far mobile sources, which emit appro ximately 4 7 % of the total ROG and 86% of the
total NOx in 2009. R eduction of ozone precursor emissions from mobile sources is
twofold: the first discussion is region wide while the second is local. The measure s implemented region wide are consistent with the Regional Transportation Plan (RTP) adopted by the S outh C alifornia A ssociation of G overnments (SCAG) . The transportation mitigation programs contained in SCAG’s RTP were adopted to help
maintain reductions of ROG and NOx emissions on a regional basis.

For the local strategy, the ICAPCD relied on the reductions of vehicle miles traveled (VMT) associated with the implementation of the Imperial County CEQA Air Quality Handbook (CEQA handbook). The CEQA handbook utilizes mitigation measure s, imposed upon commercial, residential and industrial projects which help to reduce ROG, NOx, and p articulate m atter from mobile source emissions created by the operational phase of the residential, commercial and industrial projects.

5.4.1 R egional Measures

SCAG functions as the Metropolitan Planning Organization (MPO) for six counties, Los Angeles, Orange, San Bernardino, Riverside, Ventura and Imperial. As the designated MPO, SCAG is mandated by the federal government to research and plan for transportation, growth management, hazardous waste management and air quality. The byproduct of this research is the 2008 RTP.

The 2008 RTP is SCAG’s multi

- modal plan for a better regional transportation system, integrated with the best possible gro wth pattern for the region out to 2035. The plan provides the basic policy and program framework for long

- term investment in the region’s vast transportation system in a coordinated, cooperative and continuous manner. Transportation investments in the SC AG region that receive state or federal transportation funds must be consistent with the RTP and must be included in the RTP when ready for funding.

As part of its many functions SCAG is required by law to ensure that transportation
activities “conform” to and are supportive of, the regional and state air quality plans to attain the NAAQS. That is, SCAG has the responsibility under the CAA to determine conformity by comparing the Air Plan against projects, plans and programs, including the Transportatio n Conformity Rule. As such, SCAG’s 2008 RTP provides the basis forFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 37 of 6 3 the transportation control measures for the Modified AQMP.

Currently, l ong term transportation planning requirements which target emission reductions from on road mobile sources, within the basin, are met by SCAG’s RTP which is developed every four years with a 30 year planning horizon. The short term implementation requirem ents of the Transportation Conformity Rule are met by SCAG’s biennial Regional Transportation Improvement Plan (RTIP).

Measures which reduce motor vehicle emissions by intentionally causing the reduction of vehicle trips, vehicle use, VMT, vehicle idling and traffic congestion are known as

T ransportation C ontrol M easure s (TCM’s) . The 2008 RTP includes the following types of transportation mitigation programs:

Increased rideshare and work

- at

- home opportunities to reduce demand on the transportation syste m.

Investments in non

- motorized transportation and maximizing the benefits of the

land use

- transportation connection.

Travel Demand Management (TDM) measures.

Goods movement capacity enhancements.

Key transportation investments targeted to reduce heavy

- duty truck delay.

With each new RTP update a new list of TCMs from the first two years are rolled over

into the Modified AQMP upon approval by CARB and U.S. EPA. Once a TCM project is completed, it is reported in the RTP update as completed and rem oved from future

RTPs. However, a TCM substitution is required when a committed TCM project cannot be delivered or will be significantly delayed. Here, in Imperial County the Imperial County Transportation Commission (ICTC), in consultation with SCA G, is the agency

which reviews projects to determine if TCMs are defined by a project according to the categories as listed below. Table 5

- 3 represents the TCM projects which have been deemed feasible in Imperial County. The TCM’s listed are project categorie s for which local cities and the Imperial County have either implemented or are proposing as future

measure s

.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 38 of 6 3 Table 5

- 3
REGIONAL TRANSPOR T ATION PLAN
TRANSPOR T ATION CONTROL MEASURE PROJECT CATEGORIES Project Category

A Ridesharing Measures Carpooling, Vanpooling, Park and Ride Lots, Ride Matching Services, Incentive Programs, Satellite Work Centers, Guaranteed Ride Home Programs, Station Cars, Onsite Services

B Non

- Motorized Measures Bicycle Paths/Facilities, Pedestrian Paths/Facilities, Te lecommuting, Flexible Work Schedules, Bicycle and Pedestrian Programs

C Traffic Flow Improvement Measures Signal Synchronization, Intersection Improvements, Incentive/Disincentive Programs, High Occupancy Vehicle Lanes, Intelligent Transportation Systems, Ramp Metering

D Land Use Measures Transportation Demand Management (TDM) Ordinances, Smart Growth/Sustainable Community Projects, Mixed Use Development, Parking Management and Standards, Congestion Management Plan, TDM Strategies

E Transit Measures Bus Fleet Expansion, Shuttles and Paratransit Vehicles Expansion, Transit Stations and Facilities, Express Busways, Passenger Rail Service, Rail Stations and Facilities, Real

- Time Transit Information Systems, Transit Subsidies.

5.4.2 Local Strategy

On Novembe r 6, 2007, the Imperial County Air Pollution Control District Board of Directors approved the ICAPCD ’s guidance document known as the CEQA Air Quality Handbook. The CEQA handbook provides guidance to all interested parties on the significance of impacts r esulting from the development of new residential, commercial, and industrial projects. Once the significance of the impact is determined

, the CEQA handbook provides a list of feasible mitigation measures which are implemented for the
reduction of those di rect and indirect emissions created by the development project. Specifically, the CEQA handbook requires mitigation of construction and operational air emissions. However, important to the Modified AQMP is the reduction of mobile source

emissions created as an indirect source of a development project. That is, the great majority of emissions during the operational phase of a project are from mobile source emissions in the form of increased VMT. The CEQA handbook serves as a guidance to help reduce or eli minate the number of VMT associated with new development projects. Therefore, the ICAPCD has adopted the CEQA measures as TCM’s for the local strategy in reducing or eliminating VMT’s.

Table 5

- 4 presents a list of the local TCM’s which will either reduce or eliminate the
number of VMTs.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 39 of 6 3 Table 5

- 4
IMPERIAL COUNTY CEQA AIR QUALITY HANDBOOK
TRANSPORTATION CONTROL MEASURES



### Local TCMs for Residential Projects Local TCMs for Commercial Projects

Standard Site Design Measures

Link cul

- de sacs and dead

- end streets to encourage pedestrian and bicycle travel; Provide on

- site bicycle lockers and/or racks;

Allocate easements or land dedications for bikeways and pedestrian walkways; Provide on

- site eating, refrigeration and food vending facilities to reduce lunchtime trips; Provide continuous sidewalks separated from the roadway and adequate lighting; Provide shower and locker facilities to encourage employees to bike and/or walk to work; Provide bicycle storage at apa rtment complex or condos without garages; Discretionary Site Design Measures If project near transit route, improve accessibility; If project near transit route, improve accessibility; Increase street tree planting; Increase street tree planting; Outdoor electrical outlets to encourage use of electric appliances and tools; Improve on

- site circulation design elements in parking lots to reduce vehicles queuing; Provide bikeways lanes and/or link new bikeways lanes to existing;

Increase the number of bicycle routes/lanes; Increase the number of bicycle routes/lanes; Provide pedestrian signalization to improve pedestrian safety; Provide pedestrian signalization to improve pedestrian safety; Synchronize traffic lights on street impacted by developme nt; Synchronize traffic lights on street impacted by development; Use Energy Efficiency Design Measures. Use Energy Efficiency Design Measures. Standard Site Design Measures for Industrial Projects Implement carpool/vanpool programs and incentives (i.e. carpool ride matching for employees, assistance with vanpool formation, provision of vanpool vehicles, etc.)

Provide for shuttle/mini bus service such as to establish a shuttle service from

residenti al care areas to the worksite. Provide preferential carpool and vanpool parking Construct transit facilities such as bus turnouts/bus bulbs, benches, shelters, etc if the project is located on an established transit route. Design and locate buildings to facilitate transit access (i.e., locate building entrances near transit stops, eliminate building setbacks, etc.) Provide incentives to employees to take public transportation, walk, bike, etc. Provide pedestrian signalization and signage to improve ped estrian safety. Implement on

- site circulation design elements in parking lots to reduce vehicle queingFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 40 of 6 3 Table 5

- 4
IMPERIAL COUNTY CEQA AIR QUALITY HANDBOOK
TRANSPORTATION CONTROL MEASURES and improve the pedestrian environment.

Provide on

- site bicycle and motorcycle parking. Such as providing weather

- protected bicycle parking for employ ees. Provide safe, direct access for bicyclists to adjacent bicycle routes. Provide shower and locker facilities to encourage employees to bike and/or walk to work

– typically, one shower and three lockers for every 25 employees.

Provide on

- site eating, refrigeration and food vending facilities to reduce lunchtime trips. Increase street tree planting Measures which meet mandatory, prescriptive and/or performance measures as required by Title 24. Use low emission fleet vehicles such as TLEV, ULEV, LEV, ZEV Install an electrical vehicle charging station with both conductive and inductive charging capabilities.

Use built

- in energy efficient appliances, where applicable.

5.5 INCENTIVE PROGRAMS

5.5.1 Carl Moyer Program

The majority of the new measures in the California state strategy encompass in

- use measures which have traditionally resulted in flexible regulation

– allowing the most

cost

- effective method to be used by those having to meet the emission requirements.

Th erefore, to accomplish early retirement of older more polluting engines the use of funding programs, such as Carl Moyer, became an integral part of creating emission reductions for Imperial County.

The Carl Moyer program essentially encourages the early introduction of clean air technologies onto the on

- road and off

- road vehicle fleets by providing funds to help purchase new vehicles or new engines (repowers) and for the installation of retrofit units on older engines. A variety of vehicle classes and t ypes are funded under the Carl Moyer Program to help purchase new vehicles or new engines/repowers and for installation of retrofit units on older engines. In particular, this funding provides the technologies that reduce NOx and PM emissions caused b y th e combustion of diesel powered engines. Essentially, both new and retrofit engines should be CARB

- certified
and CARB

- verified. The guidelines adopted for the Carl Moyer Program include “Fleet Modernization” and “Light

- Duty Vehicle repair and Scrapping” pr ograms. Although all potential projects must meet cost

- effectiveness requirements to be eligible for funding considerations, less polluting engines, such as alternative fuel engines will be given preference for funding. New vehicles and engines must achi eve a 30 percent reduction and repowered vehicles and retrofits must achieve a 15 percent reduction of NOx emissions compared to current emission standards. Therefore the move to cleaner burning engines holds a potential for the ICAPCD to take credit for the emission reductions achieved through past and future projects funded under this program. ForFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 41 of 6 3 example, in 2007 estimated reductions as a result of the Carl Moyer Program for all applicable subcategories is reflected in the Table 5. 5 below.

Table 5

- 5
CARL MOYER PROGRAM
REDUCTIONS IN TONS PER YEAR

(tpy) FOR 2007

TOTAL EMISSION REDUCTIONS

NOx ROG PM

Grand Total 12.710 1.579 0.445

5.5.2 Emission Reductions from New Residential and Commercial Development Projects

The California Environmental Quality Act (CEQA) requires the identification of significant environmental impacts resulting from proposed projects and the reduction of those emissions by the application of feasible mitigation measures. Specifically, new development projects produce new source s of air pollution from new vehicle trips, use of consumer products, landscape maintenance, and fuel combustion. New residential, commercial, and industrial projects are required to implement standard and discretionary design measures to reduce air quali ty impacts

. Since emissions from development projects cannot be entirely mitigated on

- site, the ICAPCD adopted Rule 310, Operational Development Schedule Fee, which mandates development projects to mitigate emissions in off

- site projects or to pay a mitiga tion fee that would be used to fund projects that reduce emissions in the most cost

- effective manner possible. Typically, off

- site reductions can occur as a result from either stationary or mobile sources. For example, NOx emissions from increased vehic le trips from a residential development could be reduced by funding the expansion of existing transit services.

5.5.3 Mobile Source Emission Reduction Credit Banking

The ICAPCD adopted in October 2006 Rule 214.1 Mobile Source Emission Reduction

Credit (MSERC) Banking which was modeled after the Voluntary Accelerated Vehicle

Retirement (VAVR) Program developed by CARB. This rule provide s an incentive for the early removal of older more polluting vehicles. The potential level of emission

reductions available th rough the use of an early retirement program will depend on the number of available older vehicles registered in Imperial County, the price a credit seeker is willing to pay

, and the number of owners that are willing to sell their vehicles at the price offered.

5.6 STATE STRATEGY

On September 27, 2007, CARB adopted the state Strategy for California’s 2007 SIP to
achieve the additional emission reductions needed for all areas of the state, includingFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 5

– CONTROL MEASURES Page 42 of 6 3 Imperial County, to attain both the federal 1997 8

- hour ozone and the PM 2.5 standards. 4
The SIP outlines the plan for meeting air quality standards in all of its non

- attainment areas. The State Strategy, including the control measures , revisions, and appendices, is
available on CARB’s SIP website. The control measures in CARB’s State Strategy target passenger vehicles, trucks, construction equipment, agricultural equipment, goods movement, fuels, recreational vehicles and boats, and p esticides. Both CARB and U.S. EPA, who have primary regulatory authority over mobile sources, implement

the measures within the State Strategy. Without regulatory authority t he ICAPCD is unable to implement any of the measures found within the SIP State Strategy

. However, the Modified AQMP incorporates the measures by reference and as such

reflects those NOx and ROG emission reductions that the measures achieve in Imperial County.

4 The CARB adopted a revi sion to the state strategy on April 24, 2009. The proposed revision accounts for emission reductions from the regulations adopted in 2007 and 2008, clarifies ARB’s legal commitments in light of U.S. EPA’s approval criteria, and clarifies the discussion of the long

- term strategy for identifying future technologies to achieve the last increment of reductions. The proposed revision does not change the emission reductions of oxides of nitrogen, reactive organic gases, oxides of sulfur and direct PM2.5 that the Board committed to achieve by specific years when it adopted the 2007 State Strategy.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 6

– EMISSION FORECAST Page 43 of 6 3 

# CHAPTER 6

EMISSION FORECAST

6.1 INTRODUCTION

6.2 FORECAST METHODS AND ASSUMPTIONS

6.3 EXTERNAL ADJUSTMENTS TO EMISSION INVENTORY

6.4 EMISSION INVENTORY FORECAST

6.5 EMISSION INVENTORY TRENDS

6.6 TRANSPORTATION CONFORMITYFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 6

– EMISSION FORECAST Page 44 of 6 3 CHAPTER 6

- EMISSION FORECASTS

6.1 INTRODUCTION

Any evaluation of control measure effectiveness must include future emissions impacts. These impacts are typically analyzed in order to ascertain whether the control measures as implemented will be enough to maintain the 1997 8

- hour ozone NAAQS or whether new control measures will be required. The primary tool utilized to analyze future impacts is the emissions forecast. The e mission forecast provides estimate s of future year emissions by projecting the effects of economic growth and existing regulations on future year emission inventories. The resulting projections can be used for a variety of purposes, including modeling of future air quality, assessing the effectiveness of new and proposed control measures, analyzing new source impacts, and tracking pr ogress towards clean air.

The 2002 emissions inventory presented in Chapter 4 provides an up

- to

- date, comprehensive base inventory that can be used to forecast future year emissions.
Since this Modified AQMP only addresses ozone, only emission s forecast o f ROG and NOx, the precursors to ozone, are presented. Therefore, t he 2002 planning inventory was used to generate emission s forecast for the years 2005 on thru 2023.

Essentially, t he forecast inventories shown in this chapter take into account projected socioeconomic growth and the emission reductions ICAPCD rules as adopted are expected to generate. Emission reductions from control measures adopted prior to

200 9 by the state CARB, for consumer products, pesticides, mobile sources, and mobile source controls adopted by U.S. EPA, are also reflected in the baseline future

emissions forecast.

6.2 FORECAST METHODS AND ASSUMPTIONS

Emissions forecast are generated by applying emission growt h and control estimates to

the baseline emissions inventory

. The California Emissions Forecasting System (CEFS), a computer model maintained by CARB, stores the baseline inventory, growth, and control data, and uses pollutant

- specific algorithms to genera te the inventories used in this Plan. This section describes the general methodology used to estimate emissions in future years. The formula CEFS uses to forecast future year baseline emissions is as follows:

FYt = BY*GFt*CFt

Where:

FYt = controlled planning day emissions for the forecast year (t)

BY = base year (2002) planning day emissions per process
GFt = growth factor for forecast year (t)
CFt = control factor for forecast year (t)FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 6

– EMISSION FORECAST Page 45 of 6 3 Growth Factors

The emissions inventory is made up of indi vidual source categories (base year emission category) , each with its own socioeconomic activity factor and emission s factor as described in Chapter 4. To account for future growth, each of the base year emission categories is assigned a related activity indicator, such as population, housing, employment, or economic activity . These activity indicators are specific to e ach industry

, for which future estimates are to be developed.

For most emission categories, general socioeconomic trends such as projected population or economic growth are the driving force behind the growth assumptions

used in the emissions forecast. So me categories, however, such as on

- road motor vehicles, electric utilities and others, may use more specific trend assumptions. For example, vehicle emissions were projected using changes in activity levels related to

Vehicle Miles Travelled (VMT) , Vehicle turnover, emission controls, fuel characteristics and consumer purchase patterns. VMT’s

, are typically provided by SCAG while CARB's
EMFAC 2007 model provides all other factors needed for the vehicle emissions projection. Growth factors for the energy ca tegories are derived from the California Energy Commission’s (CEC) energy use forecast.

Emission Controls

In addition to changes in socioeconomic conditions and specific trend assumptions

, emissions will change over time due to the implementation process of a control

measure known as a control factor

.

A control factor is a combination of the following four elements:

1. technological control efficiency (CE) of the control technology, equipment or strategy requirement of the control measure;

2. compliance efficiency, or rule effectiveness (RE) of the control measure, reflecting the actual “real world” ability of a control measure to achieve expected emission reductions;

3. Rule penetration (RP), or impact factor, representing the relative amount of

emissions i n a source category subject to a control measure, Taking into consideration any exemptions and other control measures; and,

4. implementation factors (IP), or relative amount of total control taking place in a given year, for control measures having phased im plementation or control requirements taking place in tiers.

Control factors are useful in that they are used to quantify the remaining uncontrolled emissions in a source category after control s are applied in order to understand the impact to the emission s inventory

. This impact or lack of impact to the emissions inventory helps the ICAPCD make appropriate determinations concerning rule development. Control Factors are represented by the following equation:FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 6

– EMISSION FORECAST Page 46 of 6 3 CF = 1

– (CE*RE*RP*IP)

Control Factors are spe cific to an emission source and are relative to the control levels for the base year 2002 which helps in the understanding of future year projected

emission controls

Uncertainties in Forecasting

As with any forecasting scheme, the one used for the emiss ion projections presented in this Modified AQMP can only be a t best an estimate. Original forecasts in 2002 for 2010 could not have taken into account the decline in the economic stability currently

witnessed. W ith the decrease in employment opportunities and the closing of businesses across all sectors earlier emissions projections may be lower than previously estimated creating a lower emissions projection.

Likewise, the Department of Finance ’s (DOF) population estimate s are primarily based on past growth trends and do not account for potential resource constraints or other limitations to growth. Thus, the projected future emissions for source categories that are population dependent may be overestimated if population doe s not increase at the
forecast ed rate.

Conversely, if an existing control i s not as effective as is estimated in the emission inventory, then future emissions would be higher than the forecast for that source category. Also, unforeseen technolog ical changes could alter the accuracy of the
emissions forecast.

The baseline inventory used to develop this plan reflects our understanding of sources, activity levels, and emission rates at a singular point in time. Planners use this “frozen”

invento ry to p rovide a stable base for an analysis of the causes of air pollution in the Imperial County and to evaluate the impact of current and potential new controls. However, the development of the bas eline and forecast inventories is a dynamic process. Our under standing of the elements that go into the inventory and forecasts

- the activity levels, em ission rates, growth and control factors

- changes as we learn

more about each source category. Activity indicators ( such as population, fuel consumption, etc.) mus t also be adjusted occasionally to reflect current socioeconomic conditions. Thus, refinement of the emission estimates is an ongoing process as new

and better data become s available. Future updates to the Modified AQMP will include

revised estimates of bo th the baseline and forecast emissions.

6.3 EXTERNAL ADJUSTMENTS TO THE EMISSIONS INVENTORY

Table 6

- 1 identifies the primary updates made after CARB’s CEFS v1.06 baseline inventory was finalized. These “off

- model” adjustments are reflected in the emission

p rojections for the Modified AQMP. The emission changes shown are the tons per day (tpd) impact during the summer months.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 6

– EMISSION FORECAST Page 47 of 6 3 Table 6

- 1
CARB ADJUSTMENTS TO THE EMISSIONS INVENTORY BASELINE

Emission Effective Emissions Inventory Code Description Year Reductions (EIC) Implemented (tpd)

050

- 995

- 0110

- 0000, Fuel Combustion, Manufacturing and Industrial, Other, Natural

Gas NOx summer emissions

were reduced based on updated natural gas data from the CA Energy
Commission. 2002

- 2009 4.7 tpd of
NOx in 2002 and 5.2 tpd
NOx in 2009

060

- 995

- 0110

- 0000, Fuel Combustion, Services and Commercial, Other,

Natural Gas NOx summer emissions

were reduced based on updated natural gas data from the CA Energy
Commission. 2002

- 2009 0.3 tpd of
NOx in 2002

and 2009

530, Pesticides/Fertilizers ROG emissions were based on 2004 pesticide emissions inventory data provided by the Department of Pesticide Regulation. 2002

- 2009 0.14 tpd
ROG in 2002

and 0.33 tpd
ROG in 2009

6.4 EMISSION INVENTORY FORECAST

This section summarizes the ROG and NOx emissions inventory forecast for 20 09 . The 2009 average annual and summer planning emissions inventories were developed from the 2002 Base Year Inventory, applying the CEFS growth factors and the impact of

current c ontrol programs as described in Chapter 5. Resulting emission projections for 2009 average annual and summer planning emissions invento ries are summarized in

Table 6

- 3 and Table 6

- 4 , respectively. A detailed breakdown of emissions per each source category is presented in Appendix B.

Both ROG and NOx emissions are predicted to decrease dramatically in Imperial County from 2002 to 2009 due to existing State and ICAPCD control measures and programs, as discussed in Chapter 5. The emission reductions discusse d in this section, and depicted in Table 6

- 3 result from the control strategies relied upon for compliance with existing CAA requirements. New ly adopted controls as well as existing

controls as described in Chapter 5 provide additional emissions reductions and

contribute toward s the maintenance of the 1997 8

- hour ozone NAAQS

.

The emission inventory data depicted in this document was obtained from CEFS, Version 1.06, and CARB’s Planning and Support Division

. The on

- road mobile source data was evaluated by the Planning a nd Support Division using EMFAC 2007 v2.3 and updated using the vehicle population information provided by SCAG as of March 2008.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 6

– EMISSION FORECAST Page 48 of 6 3 Table 6

- 2 shows important motor vehicle growth indicators from the CARB EMFAC2007

v2.3 on

- road mobile model and SCAG ’s 2008 RTP

.

Table 6

- 2
MOTOR VEHICLE GROWTH TRENDS Imperial County

Totals Indicators 2002 2009

All vehicle categories Vehicles 121,707 161,231

Vehicle miles traveled (x1000) VMT/1000 4,780 6,277

All vehicle trips Trips 808,700 1,054,090

Fuel Consumption (1000 gallons) Gasoline 217.44 285.15

Diesel 97.07 115.09

Notes: EMFAC2007v2.3; Nov 1, 2006 Run Date: 03/18/2008 Season Summer

The 2009 summer planning emissions inventory is summarized in Table 6

- 3 . An examination of this table provides the following information.

1. Total emissions of ROG for Imperial County were calculated at 32 tpd for the 2009 summer planning emissions inventory. Table 6

- 3 shows that over 2 1 % of daily ROG

emissions are attributable to on

- road vehicles, primarily automobiles. Other mobile sources, such as off

- road vehicles, trains, and aircraft contribute another 2 6 % of these emissions. Area sources such as: solvent use (emissions from pesticides applica tion), petroleum related activities, and farming operations (emissions from feedlots and dairies) constitute most of the remaining R OG emissions with approximately 48 %.

2. The total NOx emissions in summer 2009 were estimated to be 3 2 t pd . As shown in

Table 6

- 3 , sources in the on

- road vehicles category were the largest contributor, with

about 5 2 % of the daily NOx emissions. Other mobile categories were again a significant component with about 3 5 % of daily NOx emissions.

3. Despite a significant reduction fro m the 2002 inventory, pesticide application is still a large stationary source of ROG emissions. In the summer of 2009 it will emit 3.5 tpd
of ROG. See the detailed ROG Summer Planning Inventory list under Area

- Wide Solvent Evaporation.

4. The largest source of NOx emissions for the summer planning inventory was the

mobile source category , which will emit approximately 28 tpd or approximately 8 7
% of the total NOx emissions in 2009.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 6

– EMISSION FORECAST Page 49 of 6 3 Table 6

- 3
EMISSIONS BY MAJOR SOURCE CATEGORY
2009 SUMMER PLANNING INVENTORY (tons/day) Source Category ROG %
TOTAL NOX %
TOTAL Stationary Sources

Fuel Combustion 0.12 0.38 3.4 0 10. 60 Waste Disposal 0.02 0.06 0.00 0.00 Cleaning and Surface Coatings 0.4 2 1. 33 0.0 0 0.00 Petroleum Prod. and Marketing 0.72 2.2 8 0.00 0.00

Industrial Processes 0.07 0.22 0.04 0.1 2 Total Stationary Sources 1.35 4.27 3.4 4 10.72

Area

- wide Sources Solvent Evaporation 7.25 a 2 2.92 0.00 0.00

Miscellaneous Processes 8.04 2 5.42 0.8 9 2.77

Total Area

- Wide Sources 1 5.29 48.34 0.8 9 2.77
Mobile Sources

On

- Road Motor Vehicles 6.7 6 2 1.37 1 6.53 5 1.51

Off

- Road Vehicles 8.23 2 6.02 1 1.23 3 5.00
Total Mobile Sources 14. 99 47.39 27.76 86.51

Total for Imperial 3 1.63 100.00 3 2.0 9 100.00

a Under the detailed Summer Planning inventory list for ROG the Pesiticides/Fertilizers fall under the Area

- Wide section.

6.5 EMISSION INVENTORY TRENDS

A comparison of 2002 and 2009 ROG and NOx summer planning inventories is

s ummarized in Table 6

- 4. The emission reductions as illustrated in Table 6

- 4 reflect the difference in emissions resulting from the adoption and implementation of rules adopted prior to December of 200 9 . ROG summer planning emissions should decrease by 5.69 tpd or 1 5.24 % in 2009 compared to the 2002 base year. In addition, NOx summer planning emission s should decrease by 5. 3 5 tpd or 14. 2 9 % for the same year period.

Table 6

- 4
IMPERIAL COUNTY SUMMER PLANNING

EMISSIONS INVENTORY COMPARISON

ROG Tons per Day Reductions

2002

- 2009

2002 2009 Tons per day Percent

Stationary 1.2 8 1.35

5.69 15.24 Area

- Wide 20.82 1 5.29

On

- Road Mobile 8.7 7 6.7 6

Off

- Road Mobile 6.4 5 8.23

Total ROG 37.3 2 3 1.63FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 6

– EMISSION FORECAST Page 50 of 6 3 Table 6

- 4
IMPERIAL COUNTY SUMMER PLANNING

EMISSIONS INVENTORY COMPARISON

NOx Tons per Day Reductions

2002

- 2009

2002 2009 Tons per day Percent

Stationary 3. 60 3.4 4

5. 34 14. 27 Area

- Wide 0.9 2 0.8 9

On

- Road Mobile 20.2 1 1 6.53

Off

- Road Mobile 12. 70 1 1.23

Total NOx 37.43 3 2.09

6.6 TRANSPORTATION CONFORMITY

Transportation conformity is a CAA provision which requires transportation planning agencies to demonstrate that their transportation plans, funding programs, and projects

are conforming to an adopted SIP. One manner in which conformity may be

demonstrated is a comparison, by transportation planning agencies, of vehicle emissions from transportation plans to emissions budgets in an adopted SIP. An emissions budget is reflective of the level of emissions from on

- road motor vehicles that

ensures an area eithe r maintains the NAAQS or makes progress toward clean air

.

According to the CAA in nonattainment and maintenance areas conformity means that

any action will not: (1) cause or contribute to violations of a NAAQS, (2) worsen the severity of an existing viola tion, or (3) delay timely attainment of any NAAQS or any interim milestone. Actions involving Federal Highway Administration (FHWA) or Federal Transit Administration (FTA) funding or approval are subject to the transportation conformity rule (40 CFR part 9 3, subpart A). Under this rule, metropolitan planning organizations (MPOs) in nonattainment and maintenance areas coordinate with state air quality and transportation agencies, U.S. EPA, and the FHWA and FTA to demonstrate that their metropolitan transport ation plans (“plans”) and transportation improvement programs (TIP) conform to applicable SIPs. This is typically determined by showing that estimated emissions from existing and planned highway and transit systems are less than or equal to the motor vehi cle emissions budgets (“budgets”) contained in a n adopted SIP.

For U.S. EPA to find any budget adequate and approvable, the submittal must meet the conformity adequacy requirements of 40 CFR 93.118(e)(4) and be approvable under all pertinent SIP requirem ents. For transportation conformity purposes, the cap on motor vehicle emissions is known as the motor vehicle emissions budget. The budget must
reflect all of the motor vehicle control measures contained in the attainment demonstration (40 CFR 93.118(e)(4 )(v)).FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

CHAPTER 6

– EMISSION FORECAST Page 51 of 6 3 On April 16th, 2008, the U.S. EPA found the budgets for VOC and NOx for 2009 from

the Imperial County 8

- hour Ozone Early Progress Plan adequate for use for transportation conformity purposes; see http://www.epa.gov/fedrgstr/EPA

AIR/2008/May/Day

- 05/a9821.htm

. An early progress plan is an optional plan and must simply show some progress toward attainment. As such, the early progress plan was designed to show reductions from a base year of 2002 to the year 2009. These budgets apply to all future years until a new budget is submitted in a control strategy plan. The budgets listed in Table 6

- 5 are the caps for Imperial C ounty transportation planning efforts.

Table 6

- 5 2009 Imperial County VOC and NOx Budgets, tons per day

Pollutant

-- > NOx VOC

2009 17 7FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 7

– CONCLUSIONS AND SIP CHECKLIST Page 52 of 6 3 

# CHAPTER 7

CONCLUSIONS AND SIP CHECKLIST

7.1 CHECKLIST OF SIP REQUIREMENTSFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 7

– CONCLUSIONS AND SIP CHECKLIST Page 53 of 6 3

CHAPTER 7

– CONCLUSION AND SIP CHECKLIST

7.1 CHECKLIST OF SIP REQUIREMENTS AND CONCLUSIONS

A checklist of the 8

- hour ozone SIP requirements pertinent to the Modified AQMP (as

outlined both in the U.S

. EPA general SIP guidelines for o zone Part D for “mode rate”

non

- attainment areas and the final rule of Determination of Attainment of the 1997 8

- hour o zone NAAQS for Imperial Coun ty, 74FR 63309, December 3, 2009) is presented

in Table 7.1. 5 Because the U.S. EPA made a final determination that Imperial County

attained the 1997 8

- hour o zone NAAQS in 2006

- 2008 the ruling effectively suspend ed

the following requirements : an attainment demonstration, a RFP plan, contingency measures, and other planning SIP requirements. As documented in Table 7.1, all remaining SIP requirements applicable to the Modified AQMP have been successfully

addressed.

Table 7.1

STATE IMPLEMENTATIO N PLAN CHECKLIST Required Element Document Location Comments Attainment Demonstration, (CAA, Section182(b)(1)) Not Required

Subpart 1 Reasonable
Available Control Measures (RACM), (CAA, Section 172(c)(1)) Not Required

RFP (CAA, Sections 172(c)(2), 182(b)(1)) Not Required

Emissions Inventory, (CAA, Sections 172(c)(3) and 182(a)(1)) Chapter 4 This chapter explains the 2002 emissions inventory which has been designated as the baseline for measuring progress toward
attainment of the 8

- hour ozone
NAAQS . The pollutants included in the emissions inventory are reactive organic compounds (ROG) and oxides of nitrogen (NOx), both precursors to ozone

formation. New Source Review (CAA, Sections172(c)(4) and (5); and 182(a)(2)(C) Chapter 5 There are two versions of NSR rule that are enforced by the
ICAPCD. A current version adopted as an amendment by
the ICAPCD Air Board on October 10, 2006 and a SIP version of Rule 207, Standards

5 See Appendix A for a copy of the Federal Register Notice 74FR 63309 dated December 3, 2009.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 7

– CONCLUSIONS AND SIP CHECKLIST Page 54 of 6 3 Table 7.1
STATE IMPLEMENTATIO N PLAN CHECKLIST Required Element Document Location Comments for Permit to Construct, approved on November 10,

1980. Bot h versions of Rule 207 fulfill the requirements of CAA Sections 172(c)(4) and (5), 182(a)(2)(C) and the 1.15 to 1 offset ratio required by Sections 182(a)(4) and 182(b)(5).

Contingency Measures (CAA, Section 172(c)(9) Not Required

Subpart 2 RACT for VO Cs and NOx, (CAA, Sections 182(b)(2), 182(f)) Chapter 5 This chapter explains the overall
State and local control strategies. The local component of the control strategy consists of Reasonably Available Control Measures (RACM) which are essentially cost ef

fective stationary source control

measures. The EPA established stationary source control

measures and introduced the
control measures via Control Technique Guidance (CTG)

documents. When rules are adopted and are in conformance
with CTG documents RACT

r equirements as prescribed by the CAA are typically fulfilled. A more complete analysis can be
found in the 2009 RACT SIP for Imperial County which is concurrently adopted with the
Modified AQMP. Vehicle Inspection and Maintenance (I/M), (CAA,
Sections 182(a)(2)(B), (b)(4)) Not Applicable to Imperial County because population below 200,000.

Periodic Inventory, (CAA, Section 182(a)(3)(A)) Chapter 6 This chapter explains the forecasted inventory to year

2009 and it takes into account projected socioecono mic growth

and the emission reductionsFINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP

ADOPTED JULY 13, 2010

CHAPTER 7

– CONCLUSIONS AND SIP CHECKLIST Page 55 of 6 3 Table 7.1
STATE IMPLEMENTATIO N PLAN CHECKLIST Required Element Document Location Comments anticipated from ICAPCD rules
and State control measures adopted prior to 2007

. Emissions Statement Rule, (CAA, Section 182(a)(3)(B)) ICAPCD Rule 116, Emissions Statement and Certification, adopted on February 23, 2010. Offset Ratio 1.15 to 1 (CAA, Sections 182(a)(4) and 182(b)(5)) Chapter 5 As explained in Chapter 5, there
are two versions of NSR rule that are enforced by the
ICAPCD. A current version adopted as an amendment by
the ICAPCD Air Board on October 10, 2006 and a SIP version of Rule 207, Standards for Permit to Construct, approved on November 10,
1980. Both versions of Rule 207
fulfill the 1.15 to 1 offset ratio required by CAA, Sections 182(a)(4) and 182(b)(5).

Stage 2 Gasoline Vapor Recovery (GVR), (CAA, Section 182(b)(3)) Stag e 2 GVR requirements no longer apply to moderate areas following promulgation of Onboard Refueling Vapor Recovery rule. CAA 202(a)(6); 59 FR 16262, April 6, 1994.FINAL 2009 1997 8

- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

APPENDIX A

- EPA FINAL RULEMAKING Page 56 of 6 3 

# APPENDIX A

APPROVAL AND PROMULGATION OF AIR QUALITY IMPLEMENTATION PLANS;
CALIFORNIA DETERMINATION OF ATTAINMENT

OF THE 1997 8

- HOUR OZONE STANDARD

EPA FINAL RULEMAKING

74FR 63309

– 63310, DECEMBER 3, 200963309 Federal Register / Vol. 74, No. 231 / Thursday, December 3, 2009 / Rules and Regulations

**ENVIRONMENTAL PROTECTION**
**AGENCY**

**40 CFR Part 52**

**[EPA–R09–OAR–2009–0188; FRL–9086–7]**

**Approval and Promulgation of Air Quality Implementation Plans;**  **California; Determination of Attainment**
**of the 1997 8-Hour Ozone Standard**

**AGENCY :**  Environmental Protection Agency (EPA).

**ACTION :**  Final rule.

**SUMMARY :**  The EPA is determining that the Imperial County, California
moderate 8-hour ozone nonattainment
area has attained the 1997 8-hour National Ambient Air Quality Standard (NAAQS) for ozone. This determination is based upon certified ambient air monitoring data that show the area has
monitored attainment of the 8-hour ozone NAAQS since the 2006–2008 monitoring period. In addition, quality controlled and quality assured ozone
data for 2008 that are available in the EPA Air Quality System database, but not yet certified, show that this area
continues to attain the 1997 8-hour ozone NAAQS. This determination suspends the requirements for
California to submit an attainment demonstration, a reasonable further progress plan, contingency measures, and other planning State Implementation Plans for this area
related to attainment of the 8-hour ozone NAAQS. These requirements shall remain suspended for so long as
the area continues to attain the ozone NAAQS.

**DATES :**  Effective Date: This rule is effective on January 4, 2010.

**ADDRESSES :**  EPA has established a
docket for this action under Docket
Identification No. EPA–R09–OAR–
2009–0188. All documents in the docket
are listed on the http:// www.regulations.gov Web site. Although listed in the index, some information is not publicly available, i.e., CBI or other
information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, is not placed on the Internet and will be publicly available only in hard copy form. Publicly available docket
materials are available either electronically through http:// www.regulations.gov or in hard copy at the Air Planning Office, U.S. Environmental Protection Agency, 75 Hawthorne Street, San Francisco, CA 94105–3901. EPA requests that if at all possible, you contact the contact listed
in the **FOR FURTHER INFORMATION CONTACT**  section to schedule your inspection. The Regional Office’s official hours of business are Monday through Friday, 8 to 4:55, excluding Federal holidays.

**FOR FURTHER INFORMATION CONTACT :**  Wienke Tax, Air Planning Office, U.S. Environmental Protection Agency Region 9, 75 Hawthorne Street, San Francisco, CA 94105–3901, telephone number (415) 947–4192, fax number (415) 947–3579, electronic mail Tax.wienke@epa.gov.

**SUPPLEMENTARY INFORMATION :**  Throughout this document whenever ‘‘we,’’ ‘‘us,’’ or ‘‘our’’ is used, we mean

EPA.

Table of Contents

I. What Action Is EPA Taking?
II. What Is the Effect of This Action?
III. Final Action IV. Statutory and Executive Order Reviews

I. What Action Is EPA Taking?

EPA is determining that the Imperial County, California moderate 8-hour
ozone nonattainment area has attained
the 1997 8-hour National Ambient Air Quality Standard (NAAQS) for ozone. This determination is based upon certified ambient air monitoring data
that show the area has monitored attainment of the 1997 ozone NAAQS since the 2006–2008 monitoring period. In addition, quality controlled and quality assured ozone data for 2009 that are available in the EPA Air Quality System (AQS) database, but not yet certified, show that this area continues to attain the ozone NAAQS.

Other specific requirements of the
determination and the rationale for EPA’s proposed action are explained in the Notice of Proposed Rulemaking (NPR) published on September 23, 2009 (74 FR 48495) and will not be restated here. EPA received no public comments
on the NPR.

II. What Is the Effect of This Action?

Under the provisions of EPA’s ozone implementation rule (see 40 CFR 51.918), this determination suspends the requirements for the Imperial County, California moderate ozone
nonattainment area to submit an attainment demonstration, a reasonable further progress plan, section 172(c)(9) contingency measures, and any other planning State Implementation Plans (SIPs) related to attainment of the 1997 8-hour ozone NAAQS for so long as the
area continues to attain the 1997 ozone NAAQS.

This action does not constitute a redesignation to attainment under CAA section 107(d)(3), because the area does not have an approved maintenance plan as required under section 175A of the CAA, nor a determination that the area has met the other requirements for redesignation. The classification and designation status of the area remains
moderate nonattainment for the 1997 8-hour ozone NAAQS until such time as
EPA determines that it meets the CAA requirements for redesignation to

attainment.

If EPA subsequently determines, after notice-and-comment rulemaking in the Federal Register , that the area has
violated the 1997 8-hour ozone standard, the basis for the suspension of these requirements would no longer exist, and the area would thereafter have to address the pertinent requirements.

III. Final Action

EPA is determining that the Imperial County, California 8-hour ozone
nonattainment area has attained the
1997 8-hour ozone standard and
continues to attain the standard based on data through the 2009 ozone season. As provided in 40 CFR 51.918, this determination suspends the requirements for California to submit an attainment demonstration, a reasonable further progress plan, and contingency measures under section 172(c)(9), and any other planning SIP related to
attainment of the 1997 8-hour ozone NAAQS for this area, for so long as the
area continues to attain the standard.

V. Statutory and Executive Order

Reviews

Under Executive Order 12866 (58 FR 51735, October 4, 1993), this action is not a ‘‘significant regulatory action’’ and therefore is not subject to review by the Office of Management and Budget. For this reason, this action is also not subject to Executive Order 13211, ‘‘Actions Concerning Regulations That Significantly Affect Energy Supply, Distribution, or Use’’ (66 FR 28355, May 22, 2001). This action makes a determination based on air quality data, and results in the suspension of certain Federal requirements. Accordingly, the
Administrator certifies that this rule will not have a significant economic impact on a substantial number of small entities under the Regulatory Flexibility Act (5 U.S.C. 601 et seq. ). Because this
rule makes a determination based on air quality data, and results in the suspension of certain Federal requirements, it does not contain any unfunded mandate or significantly or uniquely affect small governments, as
described in the Unfunded Mandates Reform Act of 1995 (Pub. L. 104–4).

This rule also does not have tribal implications because it will not have a
substantial direct effect on one or more


Indian tribes, on the relationship
between the Federal Government and Indian tribes, or on the distribution of power and responsibilities between the Federal Government and Indian tribes, as specified by Executive Order 13175 (59 FR 22951, November 9, 2000). This
action also does not have Federalism implications because it does not have substantial direct effects on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government, as specified in Executive Order 13132 (64 FR 43255, August 10, 1999), because it merely
makes a determination based on air quality data and results in the suspension of certain Federal requirements, and does not alter the relationship or the distribution of power and responsibilities established in the
Clean Air Act. This rule also is not subject to Executive Order 13045
‘‘Protection of Children from Environmental Health Risks and Safety Risks’’ (62 FR 19885, April 23, 1997), because it determines that air quality in the affected area is meeting Federal
standards.

The requirements of section 12(d) of the National Technology Transfer and Advancement Act of 1995 (15 U.S.C. 272 note) do not apply because it would be inconsistent with applicable law for EPA, when determining the attainment status of an area, to use voluntary consensus standards in place of promulgated air quality standards and monitoring procedures that otherwise satisfy the provisions of the Clean Air

Act.

This rule does not impose an
information collection burden under the provisions of the Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq. )

Under Executive Order 12898, EPA
finds that this rule involves a
determination of attainment based on air quality data and will not have disproportionately high and adverse
human health or environmental effects on any communities in the area, including minority and low-income

communities.

The Congressional Review Act, 5

U.S.C. 801 et seq., as added by the Small Business Regulatory Enforcement Fairness Act of 1996, generally provides that before a rule may take effect, the agency promulgating the rule must submit a rule report, which includes a copy of the rule, to each House of the Congress and to the Comptroller General
of the United States. EPA will submit a report containing this rule and other required information to the U.S. Senate, the U.S. House of Representatives, and the Comptroller General of the United States prior to publication of the rule in
the Federal Register . A major rule cannot take effect until 60 days after it is published in the Federal Register

. This action is not a ‘‘major rule’’ as defined by 5 U.S.C. 804(2).

Under section 307(b)(1) of the Clean Air Act, petitions for judicial review of
this action must be filed in the United States Court of Appeals for the appropriate circuit by May 19, 2008. Filing a petition for reconsideration by
the Administrator of this final rule does not affect the finality of this rule for the purposes of judicial review nor does it extend the time within which a petition for judicial review may be filed, and shall not postpone the effectiveness of such rule or action. This action may not be challenged later in proceedings to enforce its requirements. (See section 307(b)(2).)

List of Subjects in 40 CFR Part 52

Environmental protection, Air pollution control, Incorporation by reference, Intergovernmental relations, Nitrogen dioxide, Ozone, Reporting and recordkeeping requirements, Volatile organic compounds.

Dated: November 13, 2009.
Laura Yoshii, Acting Regional Administrator,

Region IX.

■ Part 52 of chapter I, title 40 of the Code of Federal Regulations is amended
as follows:

**PART 52—[AMENDED]**

■ 1. The authority citation for part 52
continues to read as follows:

Authority: 42 U.S.C. 7401 et seq.

**Subpart F—California**

■ 2. Section 52.282 is amended by adding paragraph (c) to read as follows:

**§ 52.282 Control strategy and regulations:**
**Ozone.**

* * * * *

(c) Determination of attainment. Effective January 4, 2010, EPA is determining that the Imperial County,
California 8-hour ozone nonattainment
area has attained the 1997 8-hour ozone standard. Under the provisions of EPA’s ozone implementation rule (see 40 CFR 51.918), this determination suspends the reasonable further progress and attainment demonstration requirements of section 182(b)(1) and related requirements of section 172(c)(9) of the Clean Air Act for as long as the area does not monitor any violations of the
8-hour ozone standard. If a violation of the 1997 ozone NAAQS is monitored in the Imperial County, California 8-hour ozone nonattainment area, this determination shall no longer apply.

[FR Doc. E9–28536 Filed 12–2–09; 8:45 am]

**BILLING CODE 6560–50–P**

**DEPARTMENT OF TRANSPORTATION**

**Pipeline and Hazardous Materials Safety Administration** 

**49 CFR Parts 192 and 195**

**[Docket ID PHMSA–2007–27954; Amdt. Nos. 192–112 and 195–93]** 

**RIN 2137–AE28**

**Pipeline Safety: Control Room Management/Human Factors** 

**AGENCY :**  Pipeline and Hazardous Materials Safety Administration (PHMSA); DOT.

**ACTION :**  Final rule.

**SUMMARY :**  PHMSA is amending the Federal pipeline safety regulations to address human factors and other aspects of control room management for pipelines where controllers use supervisory control and data acquisition (SCADA) systems. Under the final rule, affected pipeline operators must define the roles and responsibilities of controllers and provide controllers with the necessary information, training, and processes to fulfill these responsibilities. Operators must also implement methods to prevent controller fatigue. The final rule further requires operators to manage SCADA alarms, assure control room
considerations are taken into account when changing pipeline equipment or configurations, and review reportable
incidents or accidents to determine
whether control room actions
contributed to the event.

Hazardous liquid and gas pipelines are often monitored in a control room by controllers using computer-based equipment, such as a SCADA system, that records and displays operational information about the pipeline system, such as pressures, flow rates, and valve positions. Some SCADA systems are used by controllers to operate pipeline equipment, while, in other cases, controllers may dispatch other personnel to operate equipment in the field. These monitoring and control actions, whether via SCADA system
commands or direction to field personnel, are a principal means of managing pipeline operation.

This rule improves opportunities to reduce risk through more effective control of pipelines. It further requires


- HOUR OZONE MODIFIED AQMP ADOPTED JULY 13, 2010

APPENDIX B

– DETAILED EMISSIONS INVENTORY Page 59 of 6 3 

# APPENDIX B

NOx AND ROG

DETAILED EMISSIONS INVENTORYSUBCATEGORY 2002 2005 2006 2008 2009 2010 2011 2012 2013 2014 2015 2017 2018 2020 2023

STATIONARY

Fuel Combustion

ELECTRIC UTILITIES 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42

MANUFACTURING AND INDUSTRIAL 1.27 1.22 1.21 1.12 1.11 1.10 1.11 1.10 1.09 1.08 1.09 1.08 1.07 1.05 1.03

FOOD AND AGRICULTURAL PROCESSING 0.71 0.70 0.69 0.67 0.67 0.66 0.65 0.65 0.65 0.64 0.64 0.62 0.61 0.59 0.56

SERVICE AND COMMERCIAL 0.02 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 OTHER (FUEL COMBUSTION) 0.15 0.16 0.16 0.17 0.17 0.17 0.18 0.18 0.18 0.19 0.19 0.19 0.20 0.20 0.21

TOTAL FUEL COMBUSTION 3.57 3.53 3.51 3.41 3.40 3.38 3.38 3.38 3.37 3.35 3.36 3.34 3.33 3.29 3.25 Waste Disposal OTHER (WASTE DISPOSAL) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

TOTAL WASTE DISPOSAL Cleaning and Surface Coatings

LAUNDERING 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

DEGREASING 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

COATINGS AND RELATED PROCESS SOLVENTS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

ADHESIVES AND SEALANTS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

TOTAL CLEANING AND SURFACE COATINGS Petroleum Production and Marketing

PETROLEUM REFINING 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PETROLEUM MARKETING 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 OTHER (PETROLEUM PRODUCTION AND MARKETING 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

TOTAL PETROLEUM PRODUCTION AND MARKETING

Industrial Processes

FOOD AND AGRICULTURE 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

MINERAL PROCESSES 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01

METAL PROCESSES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 OTHER (INDUSTRIAL PROCESSES) 0.02 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03

TOTAL INDUSTRIAL PROCESES 0.03 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.05 0.05

STATIONARY SUBTOTAL 3.60 3.56 3.55 3.44 3.44 3.42 3.42 3.42 3.41 3.40 3.40 3.38 3.37 3.33 3.30

AREA-WIDE Solvent Evaporation

CONSUMER PRODUCTS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

ARCHITECTURAL COATINGS AND RELATED PROCES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PESTICIDES/FERTILIZERS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

ASPHALT PAVING / ROOFING 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

TOTAL SOLVENT EVAPORATION

Miscellaneous Processes

RESIDENTIAL FUEL COMBUSTION 0.06 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.07

FARMING OPERATIONS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

CONSTRUCTION AND DEMOLITION 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PAVED ROAD DUST 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

UNPAVED ROAD DUST 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 NOx -IMPERIAL COUNTY - SUMMER PLANNING INVENTORY - ADJUSTED FOR MEASURES AND CATEGORIES THROUGH 31 DEC 2006SUBCATEGORY 2002 2005 2006 2008 2009 2010 2011 2012 2013 2014 2015 2017 2018 2020 2023

NOx -IMPERIAL COUNTY - SUMMER PLANNING INVENTORY - ADJUSTED FOR MEASURES AND CATEGORIES THROUGH 31 DEC 2006

FUGITIVE WINDBLOWN DUST 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

FIRES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

MANAGED BURNING AND DISPOSAL 0.85 0.84 0.83 0.82 0.82 0.81 0.81 0.81 0.80 0.80 0.79 0.78 0.78 0.77 0.75

COOKING 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

TOTAL MISCELLANEOUS PROCESSES 0.92 0.90 0.90 0.89 0.89 0.88 0.88 0.87 0.87 0.87 0.86 0.85 0.85 0.84 0.83

AREA-WIDE SUBTOTAL 0.92 0.90 0.90 0.89 0.89 0.88 0.88 0.87 0.87 0.87 0.86 0.85 0.85 0.84 0.83

ON-ROAD MOBILE LIGHT DUTY PASSENGER (LDA) 2.98 2.51 2.39 2.16 2.10 2.03 1.95 1.90 1.85 1.80 1.76 1.69 1.67 1.66 1.66 LIGHT DUTY TRUCKS - 1 (LDT1) 1.57 1.25 1.18 1.02 1.01 0.98 0.95 0.91 0.88 0.84 0.79 0.68 0.62 0.51 0.38 LIGHT DUTY TRUCKS - 2 (LDT2) 1.36 1.35 1.30 1.22 1.19 1.16 1.12 1.07 1.02 0.97 0.91 0.80 0.75 0.65 0.53 MEDIUM DUTY TRUCKS (MDV) 0.33 0.42 0.41 0.41 0.40 0.39 0.38 0.37 0.37 0.36 0.35 0.32 0.31 0.27 0.23 LIGHT HEAVY DUTY GAS TRUCKS - 1 (LHDV1) 0.06 0.06 0.07 0.07 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.07 0.07 0.07 LIGHT HEAVY DUTY GAS TRUCKS - 2 (LHDV2) 0.09 0.07 0.07 0.06 0.06 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.03 0.03 MEDIUM HEAVY DUTY GAS TRUCKS (MHDV) 0.15 0.13 0.13 0.11 0.11 0.11 0.10 0.09 0.08 0.07 0.06 0.05 0.05 0.04 0.03 HEAVY HEAVY DUTY GAS TRUCKS (HHDV) 0.13 0.12 0.11 0.10 0.10 0.10 0.10 0.09 0.09 0.08 0.08 0.07 0.07 0.07 0.07 LIGHT HEAVY DUTY DIESEL TRUCKS - 1 (LHDV1) 0.01 0.10 0.12 0.14 0.13 0.12 0.11 0.10 0.09 0.08 0.07 0.06 0.05 0.05 0.04 LIGHT HEAVY DUTY DIESEL TRUCKS - 2 (LHDV2) 0.10 0.11 0.10 0.10 0.10 0.10 0.09 0.08 0.08 0.07 0.06 0.05 0.05 0.04 0.03 MEDIUM HEAVY DUTY DIESEL TRUCKS (MHDV) 0.69 0.63 0.61 0.59 0.59 0.55 0.52 0.47 0.42 0.38 0.34 0.26 0.23 0.19 0.15 HEAVY HEAVY DUTY DIESEL TRUCKS (HHDV) 12.48 8.98 11.41 10.82 10.38 9.66 8.95 8.22 7.49 6.77 6.14 4.90 4.45 3.84 3.39 MOTORCYCLES (MCY) 0.02 0.05 0.06 0.06 0.06 0.06 0.06 0.06 0.07 0.07 0.07 0.07 0.07 0.08 0.08 HEAVY DUTY DIESEL URBAN BUSES (UB) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 HEAVY DUTY GAS URBAN BUSES (UB) 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 SCHOOL BUSES (SB) 0.07 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.10 0.10 0.10 0.11 0.12 0.12 0.13 OTHER BUSES (OB) 0.09 0.09 0.08 0.08 0.08 0.07 0.07 0.07 0.06 0.06 0.06 0.05 0.05 0.04 0.03 MOTOR HOMES (MH) 0.07 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.03 0.03 0.02

ON-ROAD SUBTOTAL 20.21 16.02 18.19 17.07 16.53 15.60 14.67 13.71 12.76 11.81 10.95 9.27 8.63 7.68 6.86

OTHER MOBILE

AIRCRAFT 0.79 0.79 0.69 1.43 1.82 2.17 2.52 2.87 3.21 3.27 3.33 3.33 3.33 3.33 3.33

TRAINS 6.98 5.82 5.47 5.28 5.30 3.92 4.02 4.11 4.20 4.30 4.40 4.61 4.73 4.97 5.38

RECREATIONAL BOATS 0.32 0.40 0.42 0.43 0.43 0.43 0.43 0.42 0.42 0.42 0.42 0.43 0.43 0.43 0.42

OFF-ROAD RECREATIONAL VEHICLES 0.06 0.07 0.07 0.08 0.08 0.09 0.09 0.09 0.10 0.10 0.11 0.11 0.12 0.13 0.14
OFF-ROAD EQUIPMENT 1.77 1.69 1.60 1.52 1.48 1.44 1.41 1.37 1.34 1.28 1.22 1.11 1.06 0.97 0.88
FARM EQUIPMENT 2.78 2.52 2.44 2.21 2.11 2.04 1.94 1.81 1.68 1.57 1.46 1.24 1.14 0.96 0.75

FUEL STORAGE AND HANDLING 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

OFF-ROAD SUB-TOTAL 12.70 11.29 10.69 10.96 11.23 10.09 10.40 10.68 10.95 10.95 10.94 10.83 10.80 10.79 10.90

TOTAL INVENTORY 37.43 31.77 33.33 32.37 32.08 29.99 29.36 28.68 27.99 27.02 26.16 24.34 23.64 22.64 21.88SUBCATEGORY 2002 2005 2006 2008 2009 2010 2011 2012 2013 2014 2015 2017 2018 2020 2023

STATIONARY

Fuel Combustion
ELECTRIC UTILITIES 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04

MANUFACTURING AND INDUSTRIAL 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03

FOOD AND AGRICULTURAL PROCESSING 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04

SERVICE AND COMMERCIAL 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 OTHER (FUEL COMBUSTION) 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02

TOTAL FUEL COMBUSTION 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12

Waste Disposal OTHER (WASTE DISPOSAL) 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02

TOTAL WASTE DISPOSAL 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02

Cleaning and Surface Coatings
LAUNDERING 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01

DEGREASING 0.20 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.20

COATINGS AND RELATED PROCESS SOLVENTS 0.15 0.16 0.16 0.16 0.17 0.17 0.17 0.17 0.17 0.18 0.18 0.18 0.18 0.18 0.19

ADHESIVES AND SEALANTS 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04

TOTAL CLEANING AND SURFACE COATINGS 0.42 0.42 0.42 0.42 0.42 0.42 0.42 0.42 0.42 0.42 0.43 0.43 0.43 0.43 0.44

Petroleum Production and Marketing
PETROLEUM REFINING 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PETROLEUM MARKETING 0.64 0.68 0.69 0.70 0.71 0.71 0.71 0.73 0.73 0.74 0.75 0.76 0.76 0.78 0.79 OTHER (PETROLEUM PRODUCTION AND MARKETING 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01

TOTAL PETROLEUM PRODUCTION AND MARKETING 0.65 0.69 0.70 0.71 0.72 0.72 0.72 0.74 0.74 0.75 0.76 0.77 0.78 0.79 0.81

Industrial Processes
FOOD AND AGRICULTURE 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

MINERAL PROCESSES 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01

METAL PROCESSES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 OTHER (INDUSTRIAL PROCESSES) 0.06 0.06 0.06 0.06 0.06 0.06 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.08 0.08

TOTAL INDUSTRIAL PROCESSES 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.08 0.08 0.08 0.08 0.08 0.08 0.09 0.09

STATIONARY SUBTOTAL 1.28 1.31 1.32 1.33 1.35 1.35 1.36 1.38 1.38 1.40 1.41 1.43 1.44 1.46 1.48

AREA-WIDE

Solvent Evaporation
CONSUMER PRODUCTS 1.16 1.10 1.10 1.08 1.09 1.11 1.13 1.15 1.17 1.19 1.21 1.25 1.28 1.32 1.39

ARCHITECTURAL COATINGS AND RELATED PROCESS 0.62 0.60 0.55 0.57 0.58 0.59 0.59 0.60 0.61 0.62 0.63 0.64 0.65 0.67 0.70

PESTICIDES/FERTILIZERS 5.26 4.04 3.45 3.45 3.45 3.45 3.45 3.45 3.45 3.45 3.45 3.45 3.45 3.45 3.45

ASPHALT PAVING / ROOFING 1.96 2.05 2.08 2.12 2.13 2.15 2.16 2.17 2.17 2.18 2.19 2.21 2.21 2.22 2.24

TOTAL SOLVENT EVAPORATION 9.01 7.79 7.19 7.21 7.25 7.29 7.33 7.37 7.40 7.45 7.48 7.55 7.59 7.66 7.78

Miscellaneous Processes
RESIDENTIAL FUEL COMBUSTION 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01

FARMING OPERATIONS 9.47 6.99 8.21 5.78 5.78 5.78 5.78 5.78 5.78 5.78 5.78 5.78 5.78 5.78 5.78

CONSTRUCTION AND DEMOLITION 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PAVED ROAD DUST 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

UNPAVED ROAD DUST 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

FUGITIVE WINDBLOWN DUST 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

FIRES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ROG - IMPERIAL - SUMMER PLANNING INVENTORY -- ADJUSTED FOR MEASURES AND CATEGORIES THROUGH 31 DEC 2006SUBCATEGORY 2002 2005 2006 2008 2009 2010 2011 2012 2013 2014 2015 2017 2018 2020 2023 ROG - IMPERIAL - SUMMER PLANNING INVENTORY -- ADJUSTED FOR MEASURES AND CATEGORIES THROUGH 31 DEC 2006

MANAGED BURNING AND DISPOSAL 2.32 2.28 2.26 2.24 2.23 2.22 2.20 2.19 2.18 2.17 2.16 2.13 2.12 2.09 2.06

COOKING 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.03

TOTAL MISCELLANEOUS PROCESSES 11.81 9.30 10.50 8.05 8.04 8.03 8.02 8.01 7.99 7.98 7.97 7.95 7.94 7.91 7.88

AREA-WIDE SUBTOTAL 20.82 17.08 17.69 15.27 15.29 15.32 15.35 15.37 15.40 15.43 15.45 15.50 15.53 15.57 15.65

ON-ROAD MOBILE LIGHT DUTY PASSENGER (LDA) 4.08 3.42 3.24 2.90 2.78 2.66 2.53 2.44 2.34 2.25 2.18 2.05 1.99 1.92 1.85 LIGHT DUTY TRUCKS - 1 (LDT1) 1.74 1.48 1.43 1.31 1.30 1.28 1.26 1.23 1.20 1.16 1.11 0.99 0.92 0.80 0.65 LIGHT DUTY TRUCKS - 2 (LDT2) 1.14 1.12 1.10 1.05 1.04 1.02 1.00 0.97 0.95 0.93 0.89 0.83 0.81 0.76 0.70 MEDIUM DUTY TRUCKS (MDV) 0.22 0.28 0.27 0.27 0.27 0.27 0.26 0.27 0.27 0.28 0.28 0.29 0.30 0.30 0.29 LIGHT HEAVY DUTY GAS TRUCKS - 1 (LHDV1) 0.08 0.06 0.06 0.05 0.04 0.04 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.03 LIGHT HEAVY DUTY GAS TRUCKS - 2 (LHDV2) 0.09 0.07 0.06 0.06 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.03 0.03 0.02 0.02 MEDIUM HEAVY DUTY GAS TRUCKS (MHDV) 0.25 0.20 0.18 0.15 0.15 0.14 0.13 0.11 0.10 0.08 0.07 0.05 0.05 0.03 0.02 HEAVY HEAVY DUTY GAS TRUCKS (HHDV) 0.09 0.07 0.07 0.05 0.05 0.04 0.04 0.04 0.03 0.03 0.03 0.03 0.01 0.01 0.01 LIGHT HEAVY DUTY DIESEL TRUCKS - 1 (LHDV1) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 LIGHT HEAVY DUTY DIESEL TRUCKS - 2 (LHDV2) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MEDIUM HEAVY DUTY DIESEL TRUCKS (MHDV) 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 HEAVY HEAVY DUTY DIESEL TRUCKS (HHDV) 0.84 0.62 0.78 0.74 0.71 0.67 0.62 0.58 0.54 0.49 0.45 0.38 0.35 0.30 0.28 MOTORCYCLES (MCY) 0.11 0.25 0.27 0.29 0.29 0.30 0.30 0.31 0.31 0.32 0.33 0.34 0.34 0.35 0.36 HEAVY DUTY DIESEL URBAN BUSES (UB) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 HEAVY DUTY GAS URBAN BUSES (UB) 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 SCHOOL BUSES (SB) 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 OTHER BUSES (OB) 0.05 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.01 0.01 MOTOR HOMES (MH) 0.04 0.04 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.00

ON-ROAD SUBTOTAL 8.77 7.68 7.56 6.96 6.76 6.54 6.31 6.10 5.89 5.68 5.48 5.07 4.87 4.54 4.23

OTHER MOBILE

AIRCRAFT 0.91 0.91 0.81 1.47 1.62 1.75 1.88 2.00 2.13 2.25 2.36 2.36 2.36 2.36 2.36

TRAINS 0.53 0.55 0.55 0.54 0.54 0.55 0.55 0.56 0.56 0.57 0.58 0.59 0.60 0.61 0.64

RECREATIONAL BOATS 0.79 0.84 0.83 0.80 0.79 0.77 0.76 0.75 0.75 0.74 0.74 0.74 0.74 0.74 0.75

OFF-ROAD RECREATIONAL VEHICLES 2.65 3.42 3.62 3.86 3.98 4.10 4.24 4.38 4.52 4.68 4.84 5.19 5.37 5.76 6.40
OFF-ROAD EQUIPMENT 0.76 0.81 0.76 0.72 0.71 0.70 0.69 0.69 0.68 0.66 0.65 0.62 0.61 0.60 0.61
FARM EQUIPMENT 0.58 0.54 0.52 0.46 0.44 0.43 0.40 0.37 0.34 0.31 0.29 0.24 0.22 0.19 0.16

FUEL STORAGE AND HANDLING 0.23 0.23 0.22 0.16 0.15 0.14 0.13 0.13 0.12 0.11 0.11 0.10 0.10 0.09 0.09

OFF-ROAD SUB-TOTAL 6.45 7.30 7.31 8.03 8.23 8.43 8.65 8.87 9.10 9.32 9.56 9.83 9.99 10.35 11.00

TOTAL INVENTORY 37.32 33.37 33.88 31.59 31.63 31.65 31.67 31.72 31.77 31.83 31.90 31.84 31.83 31.92 32.37