# 2010 Annual Monitoring

Network Report for Small Districts in California

July 2010

## 2010 ANNUAL MONITORING NETWORK REPORT FOR 

## SMALL DISTRICTS IN CALIFORNIA

Planning and Technical Support Division

Air Quality Data Branch California Air Resources Board

July 2010___________________________________________________ ____________________

iii 2010 Annual Monitoring Network Report f or Small Districts in California



## Table of Contents

Section 1. Purposes, scope, and organization of re port......................... 1
Section 2. General information about the monitorin g network................. 5 Section 3. Purposes served by the monitors........................

................ 6
Section 4. Additional information about the monito rs...... ....................... 13 Section 5. Monitoring required by the U.S. EPA............ ........................ 18 Section 6. Required quality assurance of the monit oring program............ 21 Section 7. Operating schedules.................................................. ........ 25
Section 8. Additional information on PM 2.5 monitors......

.................. ..... 28 8.1 Suitability for comparison to the annual PM 2.5 NAAQS........... 28 8.2 Review of changes to PM 2.5 network.................................. 28 Section 9. Proposed and recently implemented monit oring site changes... 30
Section 10. Access to more information about the n etwork................... 32 Appendix A. Regulatory language of 40 CFR 58.10.......

..................... .. 37 Appendix B. Acronyms...............

.................................................... 41___________________________________________________ ____________________

iv 2010 Annual Monitoring Network Report fo r Small Districts in California 

## List of Tables

Table 1. Agencies Drafting Annual Network Plans......... ....................... 2 Table 2. Location of Information Required for Annu al Network Plan.......... 4 Table 3. Monitoring Purposes................................................ ............. 9
Table 4. Additional Information About the Monitors

......... ...................... 14 Table 5. Numbers of Required and Existing Sites by Metropolitan Statistical Area (MSA)......

................................. ............ ..... 20
Table 6. Current PM 2.5 Operating Schedules..................................... 26 Table 7. Planned Changes to PM 2.5 Monitors..................................... 31



## List of Figure

Figure 1. Counties and Monitoring Sites in this Re port.......................... 3___________________________________________________ ____________________

1 2010 Annual Monitoring Network Report for Small Districts in California Section 1. Purposes, scope, and organization of re port In California, there are more than 250 locations wh ere the ambient air quality is routinely measured for gaseous and particulate air pollutants. The measured data form a backbone for air quality management pro grams, provide the public with information on the status of the air quality a nd the progress in improving air quality, and are used by health researchers, busine ss interests, environmental groups, and others. This report describes the network of ambient air qu ality monitors in parts of California. The report meets requirements for an a nnual network plan as listed in Title 40, Part 58, Section 10 of the Code of Federa l Regulations (40 CFR 58.10). The language of 40 CFR 58.10 is included in Appendi x A. The regulations require that the report be submitted to the U.S. En vironmental Protection Agency (U.S. EPA) by July 1 of each year. Fourteen local air agencies in California that oper ate monitoring sites are reporting separately on the ambient monitoring with in their jurisdictions. The geographical scope of this report consists of 21 co unties or portions of counties with ambient monitoring sites for which the local a ir agencies are not drafting a separate report. Table 1 lists the local agencies that are drafting their own reports and those whose monitoring is included in t his report. Figure 1 shows the areas covered by this report and the locations of t he included monitoring sites. Table 2 lists the elements required in 40 CFR 58.10 to be in the network plan. Also listed in Table 2 is the location(s) within th e report that includes information on each required element. Table 3 in Section 3 of the report lists each of the monitoring sites covered in this report together wi th its purpose. Table 4 in Section 4 of the report lists additional informatio n about the same monitors, such as monitoring objective and spatial scale informati on. Table 5 in Section 5 of the report lists the numbers of required and existing m onitoring sites by metropolitan statistical areas (MSA) that are covered in the geo graphical scope of this report. Table 6 in Section 7 of the report lists the curren t operating schedules of the PM 2.5 monitors at PM 2.5 monitoring sites that are covered in this report. While this report covers monitoring in limited part s of California, the California Air Resources Board (ARB) produces other publicly avail able information on air quality monitoring throughout all of California. S ection 10 of this report lists references and web links to this information. As required by the regulations, this report include s monitors which are federal reference methods (FRM) or federal equivalent metho ds (FEM) and operated by air agencies. While the CFR also requires reportin g of approved regional methods (ARM), no ARMs are in operation in Californ ia at this time, and there are no plans to operate monitors of this type in Ca lifornia. The terms FRM and FEM denote monitoring instruments that are permitte d by federal regulation to measure concentrations of pollutants for comparison to the ambient air quality___________________________________________________ ____________________

2 2010 Annual Monitoring Network Report for Small Districts in California standards. An ARM is a state- or locally-approved device that serves the same purpose. The areas covered in the report are not s ubject to U.S. EPA requirements for photochemical assessment monitorin g stations (PAMS) and for NCore monitoring.
Given the interest in PM 2.5 , this report includes information on PM 2.5 continuous monitoring and PM 2.5 speciation monitoring in addition to FRMs utilize d by a number of agencies. In compiling this report, ARB solicited input from and review by the local air districts whose jurisdictions are included. Also, the report was available for a 30 day public inspection period prior to its submit tal to the U.S. EPA. This report can be downloaded from the internet at www.arb.ca.gov/aqd/amnr/amnr.htm

.

Antelope Valley APCD* Amador County APCD Great Basin Unified APCD Butte County AQMD Imperial County APCD Calaveras County APCD Mojave Desert AQMD Colusa County APCD Monterey Bay Unified APCD El Dorado County AQMD North Coast Unified AQMD Feather River AQMD Sacramento Metropolitan AQMD Glenn County APCD San Diego County APCD Kern County APCD San Francisco Bay Area AQMD Lake County AQMD San Joaquin Valley Unified APCD Lassen County APCD San Luis Obispo County APCD Mariposa County APCD Santa Barbara County APCD Mendocino County AQMD South Coast AQMD Modoc County APCD Ventura County APCD Northern Sierra AQMD Northern Sonoma County APCD Placer County APCD Shasta County AQMD Siskiyou County APCD Tehama County APCD Tuolumne County APCD Yolo-Solano AQMD *The monitoring in the Antelope Valley APCD will be discussed in the Mojave Desert AQMD's monitoring network plan. Notes: APCD stands for Air Pollution Control District AQMD stands for Air Quality Management District Air districts drafting Air districts that are

Table 1 Agencies Drafting Annual Network Plans

their own Annual Network Plans included in this ARB report___________________________________________________ ____________________

3 2010 Annual Monitoring Network Report for Small Districts in California___________________________________________________ ____________________

4 2010 Annual Monitoring Network Report for Small Districts in California Monitoring purpose information
Evidence that siting and operation criteria are met

Appendix A Appendix C Appendix D Appendix E
Air Quality System Site Identification Number (AQS Site ID)

Location of sites

Street address Geographic coordinates
Sampling and analysis methods of monitors
Operating schedules for monitors
Proposals to move/remove stations
Monitoring objectives and spatial scale
Sites suitable or not for comparison to the annual PM2.5 National Ambient Air Quality Standard (NAAQS)
Metropolitan, core-based, combined, or other statistical area information (MSA, CBSA, CSA, and micropolitan)
Review of changes to PM2.5 Network 

### Table 2

Elements required by 40 CFR 58.10 Location in Annual Network Plan 

### Location of Information Required for Annual Network Plan

Section 3

Section 6 Section 6 Section 5 Section 6
Section 3, Table 3 Section 4, Table 4

Section 3, Table 3 Section 4, Table 4
Section 4, Table 4

Section 7

Section 9
Section 4, Table 4

Section 8.1

Section 3, Table 3

Section 8.2 Section 4, Table 4___________________________________________________ ____________________

5 2010 Annual Monitoring Network Report for Small Districts in California Section 2. General information about the monitorin g network California’s ambient air monitoring network is one of the most extensive in the world, consisting of over 250 sites where air pollu tion levels are monitored and more than 700 monitors used to measure the pollutan t levels. The monitoring network needs to be large to cover the diverse rang e of topography, meteorology, emissions, and air quality in Californ ia, while adequately representing a large population. The monitoring ne twork is critical in assessing the State’s clean air progress and in determining p ollutant exposures in California. The network of monitoring sites for a pollutant ten ds to be denser where the air quality problem is worse and where the population i s greater. The monitoring network also strives to provide representative data to all the broad geographical areas in California, including the coastal areas, t he interior valleys, the desert regions, and the mountainous areas. Monitoring is also conducted in Mexico, across the border from San Diego and Calexico. Some of the monitors are operated by ARB, some by local air districts, and a few by other entities including the National Park Service, private contractors, and tribal authorities.
Ambient concentration data are collected for a wide variety of pollutants. The most important of these are ozone (O 3 ), particulate matter with diameter 2.5 microns or less (PM 2.5 ), particulate matter with diameter 10 microns or l ess (PM 10 ), and a number of toxic compounds. Monitoring for meteorological parameters is also conducted at a number of sites. Data for all of the pollutants is needed to better understand and inform the publi c of the nature of the ambient air quality problems in California. Not all pollutants are monitored at all sites. Mos t sites monitor for multiple pollutants; other sites monitor for only one or two . The State and local air quality agencies in California make the effort to only coll ect data that is needed from each site. The needs for the monitoring data are v aried. A sense of this can be gathered from the information on monitoring purpose s in the next section of this report. A fundamental purpose of monitoring is to distingui sh between areas where pollutant levels exceed the ambient air quality sta ndards and areas where they do not. Health-based ambient air standards are set at levels of pollutant concentration that result in adverse impacts to hum an health. Evidence of a standard being exceeded in an area leads to efforts to reduce the sources of pollution that result in the exceedances. In other words, air quality agencies develop strategies and regulations to achieve neede d emission reductions. Data from the ambient monitoring network are then used t o indicate the success of this, in terms of the rate of progress towards atta ining the standards or to show that standards have been attained. Section 10 of t his report includes references to more information on California monitoring networ ks.___________________________________________________ ____________________

6 2010 Annual Monitoring Network Report for Small Districts in California Section 3. Purposes served by the monitors The data from a network of air quality monitors ser ves many purposes that benefit a number of groups of society in different ways. The data are useful to health researchers, the general public, regulatory agency staff, environmentalists, business interests, and others. For example, the measurements of pollutant concentrations that come from the air quality monitors in the network are used: to determine compliance wi th ambient air quality standards; as the basis of daily reports to the pub lic in newspapers and on TV; and in determining the levels of pollution above wh ich there are significant adverse health effects. Each monitor in the networ k serves at least one purpose and most of the monitors serve multiple purposes. By their nature, some of the purposes are met by a limited number of monitors, e.g., the purpose of monitoring for the highest con centrations of a pollutant in an area. Other purposes are general in nature, e.g., most monitors are useful for public reporting of the ambient air quality in the vicinity of the monitor and for providing spatial representation of air quality in the sub-regions of a larger region. And yet other purposes are quite specific, such as for a special study on health consequences or for modeling an episode of particul arly bad air quality. Some purposes may, in one context, apply to almost all monitoring for a pollutant and in another context more selectively apply to a small subset of the monitors. Take the purpose of determining compliance with the ambient air quality standards. The State does this in order to determi ne if an area is in attainment or non-attainment of California Ambient Air Quality St andards. In this process of “State designations”, the data from all monitors in an area can be looked at but only the data from a small number of monitors with the highest concentrations will drive the determination of the designation for the area. So as used in this report, a smaller number of monitors are given the “State designation” purpose. A list of purposes along with short descriptions is included below. After that, a table (Table 3) lists the purposes served by each m onitor included in the scope of this report, and for which official data for 2009 w as reported. In Table 3, codes identify the purpose of each monitor. These codes are defined at the end of Table 3. Note that although the general purposes a pply to most of the monitors, the code for general purposes only appears if those purposes are the most important purposes for the monitor. Also, no effor t was made to indicate whether any monitors are serving ad hoc purposes at this ti me. Such conditions can change quickly. Note that Table 4 in Section 4 of this report lists the “monitoring objectives” of the monitors, and that this is different than how the t erm “monitoring purposes” is used in this report. The CFR requires that the mon itoring objectives be listed in this annual network report. These monitoring objec tives are the federal monitoring objectives as defined by the U.S. EPA. These do not include a___________________________________________________ ____________________

7 2010 Annual Monitoring Network Report for Small Districts in California number of additional State and local monitoring obj ectives. This section of the report lists the broader purposes served by the mon itors, including the State, local, and federal purposes for monitoring. The fe deral monitoring objectives are a subset of this broader list of monitoring purpose s.
Also listed in Table 3 are the locations of the mon itors, including the metropolitan and micropolitan statistical areas in which the mon itors are located. Certain requirements in 40 CFR 58 are based on metropolitan statistical areas (MSAs). MSAs are part of a classification of geographical r egions developed by the U.S. Office of Management and Budget (OMB). An MSA may include one or more counties. However, not all counties are within an MSA. In Table 3, the appropriate metropolitan or micropolitan statistica l area is listed after the county name. List of purposes with descriptions Agricultural Burning

refers to the intentional use of fire for vegetati on management, both in agricultural settings, such as fields and orchards, as well as in wildlands, including rangeland and forests, to i mprove land for wildlife and game habitat or as a tool for disease or pest preve ntion. Monitors with this purpose are used to assess when and where burning c an occur. Background Level

monitoring is used to determine general background levels of air pollutants. Background concentrations vary bet ween different air pollutants. Expected High Concentration monitoring is used to measure pollutant concentrations in areas where air pollution is expe cted to be at its highest. The state designation criteria contain the requirement for this type of monitoring in order to show that an area attains the air quality health standards. During the State area designation process, the data from all m onitors in an area can be examined, but only the data from the monitors with the highest concentrations will determine the designation of the area.

The Geyser Air Monitoring Program (GAMP) was established to monitor ambient air quality in geothermal areas, mainly monitoring for hydrogen sulfide. High Concentration

monitoring is done at sites to determine the highe st concentration of an air pollutant in an area within the monitoring network. A monitoring network may have multiple high concentra tion sites, due, for example, to varying meteorology year to year. This is a pur pose listed by the U.S. EPA. Pollutant Transport

is the movement of pollutants between air basins o r regions. Transport monitoring is used to assess and mitigate pollution in upwind areas when transported pollutant affects neighboring down wind areas. Also, transport monitoring is used to determine the extent of regio nal pollutant transport among populated areas and to agricultural and wildland ar eas.___________________________________________________ ____________________

8 2010 Annual Monitoring Network Report for Small Districts in California Population Exposure monitoring is done to represent the air pollutant concentrations a populated area is exposed to. Public Reporting

means providing air quality data to the general pu blic in a timely manner. Data can be presented in a number of ways including newspapers and TV, internet web pages, air quality maps, and hardc opies. Residential Burning

or Backyard Burning is the open burning of yard wa stes by household residents. Backyard burning includes dry weeds, plant pruning, shrubbery, tree trimmings, and branches. Data from monitors with this purpose help guide decisions regarding appropriate times to allow residential burning. Representative Concentration means locating a site to represent a geographical region with common topography and meteorology. The se sites do not necessarily indicate the highest concentrations in the area for a particular pollutant. Source Impact

monitoring is used to determine the impact of sign ificant sources or source categories of air quality emissions on am bient air quality. The air pollutant sources may be stationary or mobile. State Area Designation is the process used to determine compliance with t he State ambient air quality standards for a particula r pollutant. The State does this by monitoring the ambient air quality of an area an d, using the monitors with the highest concentrations of a particular pollutant, d etermining if the area is in attainment or non-attainment of the California Ambi ent Air Quality Standards, as already described in the discussion of Expected Hig h Concentration Monitoring. State Implementation Plan (SIP) Maintenance Requirement is part of the comprehensive SIP strategy designed to attain feder al air quality standards as quickly as possible through a combination of techno logically feasible, costeffective, and far reaching measures. The SIP is a plan prepared by States and submitted to the U.S. EPA describing how each area will attain and maintain NAAQS. Once an area attains a NAAQS, the area is required to show and maintain that status, which requires continued moni toring in the area. Trend Analysis

monitoring is useful for comparing and analyzing a ir pollution concentrations over time and distance. Usually, tr end analyses show the progress or lack of progress in improving air quali ty for an area over a period of years. Some sites are more useful than others for trend analyses. For example, it is better to have a history of monitoring at a s ite that includes the full time period of a trend analysis.
Welfare Effects

monitoring is use to measure air pollution impacts on visibility, vegetation damage, or other welfare-based impacts.___________________________________________________ ____________________

9 2010 Annual Monitoring Network Report for Small Districts in California Station/Address OZONE CO NO2 SO2 PM2.5* PM10*

LAKE COUNTY AIR BASIN Lake County Clearlake ** Middletown-Anderson Springs Road Gnrl/GAMP 11270 Anderson Springs Road, Middletown StateD
Glenbrook-High Valley Road Gnrl/GAMP 8276 High Valley Road, Cobb StateD
Lakeport-Lakeport Blvd Gnrl/StateD Gnrl/StateD Gnrl/StateD 905 Lakeport Blvd, Lakeport

LAKE TAHOE AIR BASIN El Dorado County Sacramento-Arden-Arcade-Roseville MSA South Lake Tahoe-Airport StateD/Trans 1901 Airport Road, South Lake Tahoe South Lake Tahoe-Sandy Way CONT 3337 Sandy Way, South Lake Tahoe

MOJAVE DESERT AIR BASIN Kern County Bakersfield MSA Canebrake RConc 3147 Highway 178, Canebrake Mojave-923 Poole Street HConc/StateD StateD/RConc StateD 923 Poole Street, Mojave SIPMain/Trans
Ridgecrest-100 West California Avenue StateD/RConc StateD/RConc 100 West California Avenue, Ridgecrest SIPMain

MOUNTAIN COUNTIES AIR BASIN Amador County N/A Jackson-Clinton Road Gnrl/StateD 201 Clinton Road, Jackson Trans Calaveras County N/A San Andreas-Gold Strike Road Gnrl/StateD Gnrl Gnrl 501 Gold Strike Road, San Andreas Trans El Dorado County Sacramento-Arden-Arcade-Roseville MSA Cool-Highway 193 EHConc 1400 American River Trail, Cool

Echo Summit Hconc/Trans 21200 Highway 50-Little Norway Placerville-Gold Nugget Way StateD/Trans Gnrl/StateD 3111 Gold Nugget Way, Placerville Mariposa County N/A Jerseydale-6440 Jerseydale StateD/Trans 6440 Jerseydale Road, Jerseydale
Yosemite National Park-Turtleback Dome StateD/HConc G nrl Gnrl Trans
Yosemite Village-Visitor Center CONT Gnrl/StateD
Nevada County Truckee-Grass Valley Grass Valley-Litton Building HConc/Trans SPM HConc 200 Litton Drive, Grass Valley StateD/Gnrl CONT Trends Truckee-Fire Station HConc 10049 Donner Pass Road, Truckee CONT

White Cloud Mountain Bkgnd 26533 State Highway 20, White Cloud Mountain 060571001

060570007 060170012

060570005 060170010

060430006

060430003

060431001 060170020 060170013

060290017

060050002 060290015 060170011

060290011 

### Monitoring Purposes (Monitors reporting data in 2009)



### Table 3

AQS Site #

060333001 060333010

060333011

060090001___________________________________________________ ____________________

10 2010 Annual Monitoring Network Report fo r Small Districts in California

Station/Address OZONE CO NO2 SO2 PM2.5* PM10* Placer County Sacramento-Arden-Arcade-Roseville MSA Colfax-City Hall Gnrl/StateD 33 South Main Street, Colfax Plumas County N/A Chester-222 1st Avenue CONT 222 1st Avenue, Chester

Portola-161 Nevada Street HConc 161 Nevada Street, Portola CONT/SPEC
Quincy-N Church Street HConc 267 North Church Street, Quincy CONT
Tuolumne County Phoenix Lake-Cedar Ridge Sonora-Barretta Street Gnrl/StateD 251 South Barretta Street, Sonora
NORTH COAST AIR BASIN Mendocino County Ukiah Fort Bragg-North Franklin Street Gnrl/StateD 416 North Franklin Street, Fort Bragg AgBn/ResBn CONT Ukiah-County Library Gnrl/StateD StateD 105 North Main Street, Ukiah CONT-FEM AgBn/ResBn

Ukiah-East Gobbi Street Trans/StateD Gnrl Gnrl 306 East Gobbi Street, Ukiah

Willits-899 South Main Street Trans Gnrl Gnrl 899 South Main Street, Willits

Willits-Firehouse CONT-FEM StateD 74 East Commercial Street, Willits AgBn/ResBn
Sonoma County Santa Rosa-Petaluma MSA Cloverdale AgBn/ResBn 100 Washington Street, Colverdale CONT***

Guerneville-Church and 1st AgBn/ResBn 16255 1st Street, Guerneville CONT***
Healdsburg-133 Matheson Street Gnrl 133 Matheson Street, Healdsburg AgBn/ResBn CONT*** Healdsburg-Municipal Airport Gnrl/StateD 200a Heidelberg Way, Healdsburg

NORTHEAST PLATEAU AIR BASIN Siskiyou County N/A Lava Beds National Monument Gnrl/StateD P.O. Box 867, Lava Beds AgBn
Mount Shasta-N Old Stage Road Gnrl/AgBn 3 North Old Stage Road, Mount Shasta

Yreka-Foothill Drive Gnrl/StateD Gnrl Gnrl/StateD 528 Foothill Drive, Yreka Trans AgBn

SACRAMENTO VALLEY AIR BASIN Butte County Chico MSA Chico-Manzanita Avenue Gnrl/StateD Gnrl Gnrl Gnrl/StateD Grnl/StateD 468 Manzanita Avenue, Chico AgBn CONT/SPEC AgBn
Gridley-Cowee Avenue CONT 608 Cowee Avenue, Gridley
Paradise-4405 Airport Road Gnrl/StateD 4405 Airport Road, Paradise AgBn

Paradise-Fire Station #1 CONT 767 Birch Street, Paradise 060970001

060930004 060930005 060973002

060970002

060971003 060450009

060452001

060070002

060074001 060932001

060070007

060072001 060450008 060450006 060610004

060631007

060631009 

### Table 3 (Cont.) Monitoring Purposes (Monitors reporting data in 2009)

AQS Site #

060450002 060631006

061090005___________________________________________________ ____________________

11 2010 Annual Monitoring Network Report fo r Small Districts in California

Station/Address OZONE CO NO2 SO2 PM2.5* PM10* Colusa County N/A Colusa-Sunrise Blvd Gnrl/AgBn Gnrl Gnrl/StateD 100 Sunrise Blvd, Colusa CONT AgBn
Glenn County N/A Willows-E Laurel Street Gnrl/StateD CONT StateD/AgBn 720 N Colusa Street, Willows AgBn Placer County Sacramento-Arden-Arcade-Roseville MSA Auburn-Dewitt-C Avenue StateD 108 C Avenue, Auburn
Roseville-N Sunrise Blvd StateD/AgBn Gnrl Gnrl/StateD StateD/AgBn 151 N Sunrise Blvd, Roseville CONT
Shasta County Redding MSA Anderson-North Street StateD CONT*** StateD 2220 North Street, Anderson
Lassen Volcanic Natl Park-Manzanita Lake Gnrl

Redding-Health Department Roof Gnrl/StateD Gnrl Gnrl/StateD 2630 Hospital Lane, Redding
Shasta Lake-4066 La Mesa Avenue Gnrl 4066 La Mesa Avenue, Shasta Lake Solano County Vallejo-Fairfield MSA Vacaville-Merchant Street Gnrl 650 Merchant Street, Vacaville

Vacaville-Ulatis Drive StateD/Trans CONT*** 2012 Ulatis Drive, Vacaville Sutter County Yuba City MSA Sutter Buttes-S Buttes HConc/Trans StateD/AgBn
Yuba City-Almond Street Gnrl/StateD Gnrl Gnrl Gnrl/StateD 773 Almond Street, Yuba City AgBn CONT
Tehama County Red Bluff Red Bluff-Oak Street Gnrl/StateD 502 Oak Street, Red Bluff

Red Bluff-Messer Drive Gnrl/StateD 700 Messer Drive, Red Bluff

Tuscan Butte Gnrl/StateD
Yolo County Sacramento-Arden-Arcade-Roseville MSA Davis-UCD Campus AgBn/StateD Gnrl CONT StateD

West Sacramento-15th Street StateD 132 15th Street, West Sacramento

Woodland-Gibson Road StateD Gnrl/StateD AgBn/StateD 41929 E Gibson Road, Woodland CONT***

Lead monitors are not included in this list because there is no lead monitoring in these areas. * CONT, CONT-FEM, or SPEC in a PM column denotes th at a continuous (CONT) PM or speciation (SPEC) PM m onitor is located at the site. CONT-FEM stands for a continuous federal equivalent method. Continuous PM montioring provides realtim e hourly concentration values. This is useful for public reporting, better underst anding of episodes of high PM concentrations, ident ification of sources of pollutants, possible allowa nce for less frequent filter sampling, etc. Monitoring purposes for continuous PM monitors are not listed

. ** After a county name, the table lists the U.S. Of fice of Management and Budget's metropolitan (MSA) or micropolitan statistical area that includes the county. *** Continuous PM monitors for which the data were not being submitted to ARB or EPA in 2009. 060610006

060890007 060111002

060210003

060610002 

### Monitoring Purposes (Monitors reporting data in 2009) 

### Table 3 (Cont.)

AQS Site #

060893003

060890004

060890008

060953001

060953003

061010004

061132001

061131003 061010003

061030005

061030002

061130004 061030004___________________________________________________ ____________________

12 2010 Annual Monitoring Network Report fo r Small Districts in California HConc High concentrations RConc Representative concentrations Sourc Source impact Bkgnd Background levels Trans Pollutant transport Welfr Welfare effects

EHConc Monitoring at expected high concentrati on sites relative to California Ambient Air Quality Standards AgBn Support agricultural/prescribed burn decisions ResBn Support residential burn program Trnds Trends analysis StateD Support State area designation SIPMain State Implementation Plan (SIP) mainta nce requirement GAMP Geyser Air Monitoring Program SPM Special Purpose Monitoring
The following purposes apply in a general sense to monitors throughout the network. For these, we use the code "Gnrl' in the table above. We list this code for a monitor when these purposes are some of the predominant purposes for the monito r. Gnrl Population exposure/population repr esentation Spatial representation/spatial co verage (geographical representation)

Public reporting

Most monitors are also considered to be of potentia l use for purposes such as: evaluation of emissions inventories, model validation, and source /pollutant relationships. These purposes are not separately listed in the above table. 

### Table 3 (cont.) Codes for Monitoring Purposes

Federal monitoring purposes

State and local purposes (includes the purposes above plus these below)___________________________________________________ ____________________

13 2010 Annual Monitoring Network Report fo r Small Districts in California Section 4. Additional information about the monito rs U.S. EPA regulations require that the annual networ k plan lists specific additional information about the monitors that characterizes t he nature and location of the monitoring. Table 4 lists the monitoring objective s, spatial scales, and sampling methods of the monitors that are covered in this re port. Also included in Table 4 are the geographical coordinates of the monitoring sites. The regulations also require that the annual networ k plan lists the laboratory analysis methods of the monitors. However, there i s no separate analysis method for the gaseous monitors and continuous PM m onitors. Also, for the filter-based PM monitors, only simple mass weighing is done. As already pointed out in Section 3, the “monitorin g objectives” listed below in Table 4 are not the same as the “monitoring purpose s” listed in Table 3 in Section 3. The monitoring objectives used for Tabl e 4 are the federal monitoring objectives as defined by the U.S. EPA. At the end of Table 4, the codes used for the monitoring objectives, spatial scales, and samp ling methods are defined.___________________________________________________ ____________________

14 2010 Annual Monitoring Network Report fo r Small Districts in California

Station/Coordinates OZONE CO NO2 SO2 PM2.5* PM10*

LAKE COUNTY AIR BASIN Lake County Clearlake ** Middletown-Anderson Springs Road HC/NS/ 38.7744, -122.6994 SCH, XG
Glenbrook-High Valley Road HC/NS/ 38.8502, -122.7361 SCH, XG
Lakeport-Lakeport Blvd HC/US/UV HC/NS/SCH HC/US/SCH 39.0330, -122.9219

LAKE TAHOE AIR BASIN El Dorado County Sacramento-Arden-Arcade-Roseville MSA South Lake Tahoe-Airport HC,TR/RS/ 38.9102, -119.9952 UV
South Lake Tahoe-Sandy Way CONT 38.9450, -119.9703

MOJAVE DESERT AIR BASIN Kern County Bakersfield MSA Canebrake BL/RS/SI 35.72778, -118.1393 Mojave-923 Poole Street HC, TR/RS/ HC/NS/SQ HC/RS/SI 35.0503, -118.1478 UV
Ridgecrest-100 West California Avenue RC/NS/SI HC/NS/SI 35.6211, -117.6731

MOUNTAIN COUNTIES AIR BASIN Amador County N/A Jackson-Clinton Road HC,TR/US/ 38.3427, -120.7644 UV Calaveras County N/A San Andreas-Gold Strike Road HC,TR/RS/ RC/NS/SCH RC/RS/SI 38.2019, -120.6802 UV El Dorado County Sacramento-Arden-Arcade-Roseville MSA Cool-Highway 193 HC,TR/RS/ 38.8906, -121.0000 UV

Echo Summit HC,TR/RS/ 38.8117, -120.0331 UV
Placerville-Gold Nugget Way HC,TR/RS/ HC/RS/SI 38.7247, -120.8219 UV Mariposa County N/A Jerseydale-6440 Jerseydale HC,TR/RS/ 37.5466, -119.8416 UV
Yosemite National Park-Turtleback Dome HC,TR/RS/ BL/U S/IR BL/US/CL 37.7133, -119.7058 UV
Yosemite Village-Visitor Center CONT HC/NS/SI 37.7486, -119.5869 Nevada County Truckee-Grass Valley Grass Valley-Litton Building RC/US/UV RC/NS/CL RC/NS/SCH 39.2336, -121.0555 CONT

Truckee-Fire Station HC/NS/SQ 39.3274, -120.1847 CONT

White Cloud Mountain BL/RS/UV 39.3181, -120.8456 060570007 060571001 (Monitoring Objective/Spatial Scale/Sampling Method)

060170010

060430006

060430003

060431001

060430006 060170020 060170013

060050002 060170011

060290015 060290017

060290011 Additional Information About the Monitors (Monitors reporting data in 2009) 

### Table 4

AQS Site #

060333001 060333010

060333011

060090001

060170012___________________________________________________ ____________________

15 2010 Annual Monitoring Network Report fo r Small Districts in California

Station/Coordinates OZONE CO NO2 SO2 PM2.5* PM10* Placer County Sacramento-Arden-Arcade-Roseville M SA
Colfax-City Hall HC/US/UV 39.0997, -120.9541 Plumas County N/A Chester-222 1st Avenue CONT 40.3097, -121.2277

Portola-161 Nevada Street HC/NS/SQ 39.8083, -120.4717 CONT/SPEC
Quincy-N Church Street HC/NS/SQ 39.9397, -120.9441 CONT Tuolumne County Phoenix Lake-Cedar Ridge Sonora-Barretta Street HC/NS/UV 37.9819, -120.3786
NORTH COAST AIR BASIN Mendocino County Ukiah Fort Bragg-North Franklin Street HC/NS/SI 39.4458, -123.8044 CONT
Ukiah-County Library HC/NS/SCH HC/NS/SI 39.1511, -123.2066 CONT-FEM

Ukiah-East Gobbi Street HC,TR/US/ RC/NS/IR RC/US/CL 39.1447, -123.2002 UV

Willits-899 South Main Street TR/US/UV RC/NS/IR RC/NS/ CL 39.4044, -123.3497

Willits-Firehouse CONT-FEM HC/NS/SI 39.4130, -123.3536 Sonoma County Santa Rosa-Petaluma MSA Cloverdale RC/NS/SI 38.8047, -123.0177 CONT***

Guerneville-Church and 1st RC/NS/SI 38.5016, -122.9977 CONT***
Healdsburg-133 Matheson Street RC/NS/SI 38.6111, -122.8686 CONT***
Healdsburg-Municipal Airport RC/US/UV 38.6536, -122.9005
NORTHEAST PLATEAU AIR BASIN Siskiyou County N/A Lava Beds National Monument HC/US/SI 41.7117, --121.5067 Mount Shasta-N Old Stage Road RC/NS/SI 41.3089, -122.3300

Yreka-Foothill Drive HC,TR/NS/UV HC/NS/SQ HC/NS/SI 41.7267, -122.6336
SACRAMENTO VALLEY AIR BASIN Butte County Chico MSA Chico-Manzanita Avenue HC/US/UV RC/NS/IR RC/NS/CL HC/NS/SCH HC/NS/SI 39.7575, -121.8422 CONT/SPEC
Gridley-Cowee Avenue CONT 39.3272, -121.6686 Paradise-4405 Airport Road HC/RS/UV 39.7141, -121.6177
Paradise-Fire Station #1 CONT 39.7538, -121.6244 060970001

060930004 060930005 060973002

060970002

060971003 060450009

060452001

060070002

060074001 060932001

060070007

060072001 060450008 060450006 060631007 060610004 

### Table 4 (Cont.) Additional Information About the Monitors (Monitors reporting data in 2009)

AQS Site #

060450002 061090005 060631009

060631006___________________________________________________ ____________________

16 2010 Annual Monitoring Network Report fo r Small Districts in California

Station/Coordinates OZONE CO NO2 SO2 PM2.5* PM10*

Colusa County N/A Colusa-Sunrise Blvd RC/RS/UV HC/NS/SQ HC/RS/SI 39.1888, -121.9980 CONT
Glenn County N/A Willows-E Laurel Street HC/US/UV CONT HC/RS/SI 39.5172, -122.1897 Placer County Sacramento-Arden-Arcade-Roseville MSA Auburn-Dewitt-C Avenue HC/US/UV 38.9394, -121.1055
Roseville-N Sunrise Blvd HC/US/UV RC/NS/CL RC/NS/SCH HC/US/SI 38.7461, -121.2647 CONT Shasta County Redding MSA Anderson-North Street HC/NS/UV CONT*** HC/NS/SI 40.4531, -122.2986
Lassen Volcanic Natl Park-Manzanita Lake RC/RS/UV 40.5372, -121.5764 Redding-Health Department Roof HC/NS/UV HC/NS/SCH HC/NS/SI 40.5514, -122.3808
Shasta Lake-4066 La Mesa Avenue RC/RS/SI 40.6775, -122.3733 Solano County Vallejo-Fairfield MSA Vacaville-Merchant Street RC/US/SI 38.3516, -121.9933

Vacaville-Ulatis Drive HC,TR/US/UV CONT*** 38.3583, -121.9500 Sutter County Yuba City MSA Sutter Buttes-S Buttes HC,TR/RS/UV 39.1583, -121.7500 Yuba City-Almond Street HC/US/UV RC/NS/CL HC/NS/SCH HC/NS/SI 39.1388, -121.6191 CONT
Tehama County Red Bluff Red Bluff-Oak Street HC/US/UV 40.1749, -122.2366

Red Bluff-Messer Drive HC/NS/SI 40.1638, -122.2213

Tuscan Butte HC/RS/UV 40.2622, -122.0928 Yolo County Sacramento-Arden-Arcade-Roseville MSA Davis-UCD Campus HC/US/UV RC/NS/CL CONT RC/NS/SI 38.5352, -121.7730
West Sacramento-15th Street HC/NS/SI 38.5713, -121.5258
Woodland-Gibson Road HC/US/UV HC/NS/SQ HC/US/SI 38.6605, -121.7305 CONT***

Lead (Pb) monitors are not included in this list be cause there is no lead monitoring in these areas. * CONT, CONT-FEM, or SPEC in a PM column denotes th at a continuous (CONT) PM or speciation (SPEC) PM m onitor is located at the site. CONT-FEM stands for a continuous federal equivalent method. Continuous PM montioring provides realtim e hourly concentration values. This is useful for public reporting, better underst anding of episodes of high PM concentrations, ident ification of sources of pollutants, possible allowa nce for less frequent filter sampling, etc. Monitoring objectives, spatial scales, and sampling methods a re not listed for continuous PM monitors. ** After a county name, the table lists the U.S. Of fice of Management and Budget's metropolitan (MSA) or mircopolitan statistical area that includes the county. *** Continuous PM monitors for which the data were not being submitted to ARB or EPA in 2009. 060610006

060890007 060610002 

### Additional Information About the Monitors

(Monitors reporting data in 2009) 

### Table 4 (Cont.)

AQS Site #

060111002

060210003

061132001

061131003 061010003

061030005

061030002

061130004 061030004 060953003

061010004 060893003

060890004

060890008

060953001___________________________________________________ ____________________

17 2010 Annual Monitoring Network Report fo r Small Districts in California BL Background levels HC High concentrations IM Source impact RC Representative concentrations TR Pollutant transport

MI Microscale MS Middle scale NS Neighborhood scale RS Regional scale US Urban scale

CL Chemiluminescent FL Fluoresecence IR Nondispersive infrared SCH Low volume single channel sampler, size selectiv e inlet SI High volume sampler, size selective inlet SQ Low volume sequential sampler, size selective inl et UV Ultraviolet absorption XG X-ray fluorescence Sampling methods Spatial scales Federal monitoring objectives 

### Table 4 (cont.)

Codes for Monitoring Information___________________________________________________ ____________________

18 2010 Annual Monitoring Network Report fo r Small Districts in California Section 5. Monitoring required by the U.S. EPA U.S. EPA regulations specify the minimum number of sites at which State and local air agencies must deploy monitors. In practi ce, the State and local agencies find they need to deploy significantly mor e monitors. The additional monitors are needed to fulfill State and local purp oses for monitoring that are in addition to the federal purposes. For example, bec ause State air quality standards tend to be more stringent than national s tandards, some areas may need more monitors than those needed to show compli ance with the national standards. Further, the public expects to be infor med of the actual air quality conditions where they live and work. While this ob jective is not explicitly built into the federal regulatory requirements, state and loca l air agencies in California attempt to be responsive to public expectations. Requirements for the minimum numbers of monitors ap pear in Appendix D of Part 58 of the CFR. For ozone, PM 2.5 , and PM 10 , the required minimum number is based on the population of an area and the sever ity of the air quality for the pollutant in the area. For other pollutants, no cu rrent monitoring is required by Appendix D unless an area exceeds or is close to ex ceeding a national ambient air quality standard, which is true for very few if any areas in the U.S. For purposes of the minimum requirements, the areas are defined by the MSAs developed by the OMB (more information on MSAs appe ars on page 8). Note that elsewhere in the CFR there are requirements fo r monitoring to indicate whether an area designated as attaining an air qual ity standard is maintaining the attainment status. This annual network plan is not required to address maintenance plan requirements, however, monitoring information on State and Local Air Monitoring Stations (SLAMS) and Special P urpose Monitoring (SPM) sites are included in other parts of this plan. For the parts of the State included in this report, Table 5 lists information on the number of existing O 3 , PM 2.5 , and PM 10 monitors and the number required by Appendix D. In all cases, sufficient monitoring ex ists. The information is listed by MSA. The number of required monitors is based o n the population of the MSA, taken from the 2000 U.S. Census, in combinatio n with the degree to which air quality in the MSA is greater or less than the national air quality standards. Monitoring for carbon monoxide (CO), nitrogen dioxi de (NO 2 ), and sulfur dioxide (SO 2 ) is not currently required anywhere in California in order to comply with the Appendix D requirements of 40 CFR 58. Ambient conc entrations for these pollutants do not exceed the national air quality s tandards and do not trigger these requirements for monitoring. As required by a different part of 40 CFR 58 that takes effect in 2013, new NO 2 roadside monitoring in all of California’s urban areas will be required. These new near-road monito rs will be addressed in the 2012 network report. Even without federal requirem ents, dozens of sites in California monitor for CO, SO 2 , and NO 2 already.___________________________________________________ ____________________

19 2010 Annual Monitoring Network Report fo r Small Districts in California On December 23, 2009, the U.S. EPA proposed revisio ns to the ambient lead (Pb) monitoring requirements. If adopted, the revi sions would impact both source-oriented monitors and population-oriented mo nitors. With respect to stationary lead sources, the U.S. E PA is proposing to reduce the threshold for monitoring from 1 ton per year to 0.5 tons per year. In California, the only stationary source meeting the 1 ton per ye ar threshold is the Exide Technologies facility in Vernon, which is located i n the Los Angeles County portion of the South Coast Air Basin. Exide Techno logies is a lead-acid battery recycling facility, and the most reliable estimate puts lead emissions from this facility at about 2 tons per year. The South Coast Air Quality Management District currently maintains a network of three sou rce-oriented lead monitors around Exide. If monitoring requirements are revis ed to include sources emitting 0.5 tons per year or more of lead, then lead monito rs will also be required at a number of general aviation airports. At the time t his report was drafted, the areas covered in this plan will not be required to conduc t source-oriented lead monitoring. The proposed revisions to the lead provisions also impact population-oriented monitoring. Under the initial rule, lead monitorin g was required in each Core Based Statistical Area (CBSA) with a population of at least 500,000. There were 11 qualifying CBSAs in California. Under the propo sed revisions, instead of basing monitor location on population level, the U. S.EPA is proposing to require lead monitoring at all NCore sites. Currently, the re are six candidate NCore sites in California. The NCore monitors must be operatio nal by January 1, 2011. None of the NCore sites are located in areas covere d by this network plan. A final rule on lead monitoring is expected in Spri ng 2010. For this reason, the ARB will address in more detail the lead monitoring requirements in next year’s annual network plan.___________________________________________________ ____________________

20 2010 Annual Monitoring Network Report fo r Small Districts in California Required Existing Required Existing Required Existing Req uired Existing

FRM 1 FRM Cont. 2 Cont.

Bakersfield* 661,645 2 9 2 5 1 3 2 6

Chico 203,171 1 2 1 1 1 3 0 1
Redding 163,256 1 3 0 1 0 0 0 3

1,796,857 2 16 3 5 2 6 4 9

458,614 1 2 0 1 0 0 0 3
Vallejo-Fairfield* 394,542 2 4 1 1 1 2 0 2
Yuba City 139,149 1 2 1 1 1 1 0 1

Notes: 2006-2008 air quality data was used in determining the number of required sites. Population is based on year 2000 Census data. * Parts of these MSAs are included in the geographi cal scope of this report, and parts are within the geographical scope of the reports be ing completed by the districts. The numbers of sites listed are for the entire MSA.

1 FRM: Federal Reference Method

2 Cont.: Refers to a continuous PM2.5 monitor, i.e., one that measures hourly data.

3 SSI: Size Selective Inlet. The SSI is an FRM for PM10. Metropolitan Statistical Area (MSA) Pop.

Sacramento-Arden Arcade-Roseville*Santa RosaPetaluma* Table 5 Numbers of Required and Existing Sites by Metropoli tan Statistical Area (MSA)

(MSAs that include the small air districts included in this report)

Ozone PM2.5 PM10 (SSI) 3___________________________________________________ ____________________

21 2010 Annual Monitoring Network Report fo r Small Districts in California Section 6. Required quality assurance of the monit oring program The information below, along with the information a vailable via the web link, describes the status of compliance with the require ments of 40 CFR 58, Appendices A, C, and E. The annual network plan is required to include such information. Annually, the Quality Assurance Section (QAS) of AR B conducts performance evaluations (audits) for each SO 2 , NO 2 , O 3 , and CO analyzer with National Institute of Standards and Technology (NIST) tracea ble gases. Each analyzer is audited at three levels using known concentrations of gases. Annual PM monitor flow rate audits are conducted with a BGI (Bob Guss man Incorporated) variable orifice mass flow meter, or TetraCal, which is cert ified against NIST traceable primary standards. Semi-annual flow rate audits fo r PM monitors are required. QAS conducts one annual PM flow rate audit and U.S. EPA Region 9 conducts the second PM flow rate audit. Laboratory audits for the toxics program are conduc ted using certified gases and/or materials. Meteorological audits are conduc ted with instruments that are NIST traceable and/or manufacturer-certified. All of the audits performed by QAS are conducted in accordance with the 40 CFR 58, Appendix A. As part of the annual audit at each air monitoring station, QAS conducts siting evaluations. Physical measurements and observation s, including probe/sensor height above ground level, distance from trees, typ e of ground cover, residence time, obstructions to air flow, and distance to loc al sources, topography, vehicle counts, predominant wind direction, probe material, etc., are taken to determine compliance with 40 CFR Part 58, Appendix E requirem ents. QAS also ensures the quality of the data collected by the air monitoring sites operating in California through analysis of precisi on data submitted to the U.S. EPA’s ambient air quality database, the Air Qu ality System (AQS). Precision checks for gaseous/continuous samplers ar e performed once every two weeks. Precision checks for non-continuous, co llocated particulate samplers are done at least every twelfth day. QAS staff ana lyzes the precision data in accordance with 40 CFR 58, Appendix A. In addition, air monitoring staff performs a one-po int flow rate verification check once every month on high-volume PM 10 and PM 2.5 and twice a month on BAM 10 and BAM 2.5 automated analyzers. Air monitoring staff reviews these data and takes corrective action when the results exceed U.S . EPA’s requirements. Currently, the percent difference between the flow rate of the transfer standard and corresponding flow rate measured by the analyze r are not used to assess the bias of the monitoring data in accordance with 40 CFR Part 58, Appendix A, 3.2.3. Staff is in the process of inco rporating these data to measure bias and meet Appendix A requirements.___________________________________________________ ____________________

22 2010 Annual Monitoring Network Report fo r Small Districts in California QAS also conducts system audits to determine if a d istrict’s air monitoring program satisfies the requirements of 40 CFR Part 5 8 and U.S. EPA's Quality Assurance Handbook for Air Pollution Measurement Sy stems, Volume II, December 2008. Compliance with these regulations i s necessary if the data are to be considered data-for-record per the California Code of Regulations (Title 17, Article 3, section 70301). Data meeting these requ irements are eligible to be used in actions taken pursuant to the Federal Clean Air Act and the California Clean Air Act. Information about each air monitoring station audit ed by QAS is available at http://www.arb.ca.gov/qaweb/site.php . This web page includes maps of each site, latitude and longitude coordinates as determi ned by GPS, site photos, precision and accuracy data, and a detailed site su rvey of the physical parameters and conditions at each site. This site also includes an area for district precision and accuracy reports. These rep orts are available on a limited basis to district staff. Appendix A of 40 CFR 58 also includes requirements for collocation of samplers as part of quality checks for the PM 2.5 , PM 10 , and lead (Pb) monitoring networks. The CFR contains separate collocation requirements for PM 2.5 , PM 10 , and Pb. The requirements are to be met for each primary qua lity assurance organization (PQAO). Five PQAOs exist in California, one each f or the San Francisco Bay Area AQMD, San Diego County APCD, South Coast AQMD, and Great Basin Unified APCD, and one for the remainder of the Stat e that is called the ARB PQAO.

For PM 2.5 , the CFR requires that for each PM 2.5 federal reference method (FRM) monitoring method, 15% of the sites within a PQAO h ave a collocated monitor of the same type. Three types of PM 2.5 FRMs exist currently in the ARB PQAO. Collocation requirements apply to each type. One t ype of sampler is the Rupprecht & Patashnick (R&P) PM 2.5 sequential air sampler. For this type of sampler, the collocation requirement is met. The PQAO also has R&P non-sequential samplers deplo yed. Given the 16 existing sites having this type of sampler, two of these sites are required to have a collocation sampler. Three of the sites already have collocation samplers. For this type of sampler, the collocation requirement i s also met. The third type of PM 2.5 FRM sampler is the Graseby Anderson PM 2.5 sequential sampler. Within the ARB PQAO, six existing sites o perate this sampler type, of which five sites are found in the San Joaquin Valle y Air Pollution Control District (SJVAPCD). The SJVAPCD plans to phase out these sa mplers within their own network. Currently, there is no collocation site f or this type of sampler, and one collocation site is required. The ARB is coordinat ing with the SJVAPCD to meet this requirement.___________________________________________________ ____________________

23 2010 Annual Monitoring Network Report fo r Small Districts in California The CFR also requires that 15% of the sites with PM 2.5 federal equivalent method (FEM) monitors be collocated, but that the first co llocation monitor be an FRM, the second be an FEM, and so on alternating FRM wit h FEM as additional collocation monitors are required. At the time thi s report was drafted, seven sites have this sampler type in ARB’s PQAO. The first co llocation requirement must be between an FEM/FRM; three sites of this type cur rently exist in ARB’s PQAO. A collocation site between an FEM/FEM will not be n eeded until there are at least 10 monitoring sites of this sampler type in ARB’s P QAO. For this type of sampler, the collocation requirement is also met. California is a very large state in which environme ntal conditions (e.g., temperature, precipitation, humidity, wind speeds, and elevation) vary widely and the composition of the PM 2.5 varies significantly. Also, a large number of operating agencies operate sites in the statewide P M 2.5 network. ARB and local air districts designed the locations of collocated PM 2.5 samplers to strike a balance in adequately representing all of these fac tors. In this way, the quality control function of the collocated monitoring is be st realized. While Appendix A requires 80% of the collocated monitors to be withi n + 20% of the applicable National Ambient Air Quality Standard (NAAQS), focu sing on achieving this was deemed to result in too much clustering of the coll ocated monitors in too few of the factors needing representation. The CFR also requires that 15% of PM 10 sites with manual monitoring have collocated samplers. However, the CFR language is much less specific as to what is required to meet the requirements. A U.S. EPA guidance document provides needed clarification. Agencies in the ARB PQAO deploy two types of PM 10 FRM samplers that require appropriate collocation. Both are filter-based samplers that use size selective inlets and high fl ow rates. One type uses a volumetric flow controller (VFC) and the other type uses a mass flow controller (MFC).
Given the 70 sites that have the PM 10 VFC type of sampler in the ARB PQAO, 10 of the sites will need to have collocation samplers of this same type. Six of the sites have collocated samplers now, so four more ar e required. The ARB will add collocation samplers to its sites over the next year or so, in conjunction with other changes in the PM 10 FRM network, so that the collocation requirement w ill be met. As for the other type of PM 10 FRM sampler, i.e., the MFC type, three sites have this type of sampler in the ARB PQAO. One of those sites already has a collocated sampler, so the collocation requirement is met. On December 23, 2009, the U.S. EPA proposed revisio ns to the ambient lead (Pb) monitoring requirements. If adopted, the revi sions would impact both source-oriented monitors and population-oriented mo nitors. A final rule on lead___________________________________________________ ____________________

24 2010 Annual Monitoring Network Report fo r Small Districts in California monitoring is expected in spring 2010. At the time this plan was drafted, no source-oriented lead monitoring is required in the areas covered in this plan. Moreover, it is unclear if the revised proposal for population-oriented lead monitoring at NCore sites will be approved; therefo re, the collocation requirements for population-oriented Pb monitoring will be more specifically addressed in next year’s annual network plan.

For PM 2.5 , PM 10 , and Pb, if the network needs to have additional c ollocation monitors in order to meet the requirements, we will work with the appropriate air monitoring agencies to deploy the required number o f additional collocation monitors.___________________________________________________ ____________________

25 2010 Annual Monitoring Network Report fo r Small Districts in California Section 7. Operating schedules The CFR requires that the annual network plan inclu de information about operating schedules. While gaseous monitors (e.g., O 3 , CO, NO 2 , SO 2 ) and particulate monitoring with FEMs usually operate co ntinuously and all year, particulate monitoring with FRMs often operate one day out of every three days or one day out of every six days. The primary reas on why particulate FRMs operate less frequently is that the particulate FRM s are filter-based and therefore much more labor intensive, requiring that field sta ff frequently retrieve and replace filters and that laboratory staff pre- and post-weigh filters. Of course, the intended operating schedule can be disrupted by ins trument failures and other unanticipated situations. The continuous gaseous a nd particulate monitors produce hourly measurements of the gaseous and part iculate pollutants, while the particulate filter-based monitors produce 24-ho ur measurements of particulate pollutants.

Particulate matter operating schedules Current operating schedules for PM 2.5 FRM monitors in the areas included in this report are listed in Table 6 below. The current op erating schedules of the PM 2.5 FRM monitors listed in Table 6 were obtained from t he U.S. EPA’s AQS database.
While there are a number of continuous PM 2.5 monitors deployed, most of these are not federal reference or equivalent methods. I n March of 2008, the U.S. EPA approved the first continuous PM 2.5 FEM. In the ARB’s PQAO, there are seven continuous PM 2.5 FEM sites; however, in the areas covered by this r eport, there are only two continuous PM 2.5 FEM sites that are currently reporting data into t he AQS database at this time. The two sites are Ukiah and Willits. Operating schedules for the manual PM 10 samplers in the areas included in this report operate on a one day (24-hour) in every six day schedule. There are two continuous PM 10 monitors operating in the area that this report co vers, which are reporting data into AQS. These monitors are locate d at the South Lake TahoeSandy Way and Fort Bragg sites. The Northern Sonom a County APCD is transitioning to continuous PM 10 monitoring within its network; however, no data are being reported to AQS at this time.___________________________________________________ ____________________

26 2010 Annual Monitoring Network Report fo r Small Districts in California

Site Name AQS Site # Current Laboratory

LAKE COUNTY AIR BASIN Lake County Lakeport-Lakeport Blvd 060333001 1 in 6 day LAKE COUNT Y
MOJAVE DESERT AIR BASIN Kern County Mojave-923 Poole Street 060290011 1 in 6 day SAN DIEGO COUNTY
Ridgecrest-100 West California 060290015 1 in 6 day SA N DIEGO COUNTY

MOUNTAIN COUNTIES AIR BASIN Calveras County San Andreas-Gold Strike Road 060090001 1 in 6 day ARB
Nevada County Grass Valley-Litton Building 060570005 1 in 6 day ARB
Truckee-Fire Station 060571001 1 in 3 day ARB Plumas County Portola-222 1st Avenue 060631007 1 in 3 day ARB
Quincy-N Church Street 060631006 1 in 3 day ARB
NORTHEAST PLATEAU AIR BASIN Siskiyou County Yreka-Foothill Drive 060932001 1 in 6 day ARB

SACRAMENTO VALLEY AIR BASIN Butte County Chico-Manzanita Avenue 060070002 1 in 6 day ARB
Colusa County Colusa-Sunrise Blvd 060111002 1 in 6 day ARB
Placer County Roseville-N Sunrise Blvd 060610006 1 in 6 day ARB
Shasta County Redding-Health Department Roof 060890004 1 in 6 day AR B
Sutter County Yuba City-Almond Street 061010003 Everyday ARB
Yolo County Woodland-Gibson Road 061131003 1 in 6 day ARB

* All PM10 monitors in the area included in this re port are operated on a 1 in 6 day schedule except t he continuous PM10 monitor at the South Lake Tahoe (06 0170011) and Fort Bragg (060450002) sites, which are currently reporting data into the AQS dat abase. Table 6 Current PM2.5 Operating Schedules* (Monitors for the small air districts included in t his report)___________________________________________________ ____________________

27 2010 Annual Monitoring Network Report fo r Small Districts in California Ozone operating schedules
While most O 3 monitors operate continuously all year, a small nu mber of O 3 sites in the areas included in this volume operate only i n the warmer six months of the year. Several of these sites are at higher elevati on where access during the winter can be problematic. Also, for most of the S tate, O 3 is a summertime problem and concentrations during the winter are we ll below the levels of the ambient air quality standards. The following seaso nal O 3 sites in the areas included in this report all operate from May throug h October:

Cool (El Dorado County) Echo Summit (El Dorado County) Jerseydale (Mariposa County) Sutter Buttes (Sutter County) South Lake Tahoe-Airport (El Dorado County) Tuscan Butte (Tehama County)___________________________________________________ ____________________

28 2010 Annual Monitoring Network Report fo r Small Districts in California Section 8. Additional information on PM 2.5 monitors This section includes information for two required annual network plan elements that relate specifically to PM 2.5 and do not fit well elsewhere in the report. One required element relates to whether data for a PM 2.5 monitor can be used to determine compliance with the national annual PM 2.5 air quality standard. In the CFR, this is termed as the suitability for comparis on to the annual standard. The other element requires including in the annual netw ork plan information regarding the review process followed by air agencies when ch anges are made to the location of a PM 2.5 monitor that is violating a PM 2.5 NAAQS.

8.1 Suitability for comparison to the annual PM 2.5 NAAQS The CFR requires that a PM 2.5 FRM or FEM monitor be located at a neighborhood scale in order for the data from the m onitor to be used in regulatory determinations of compliance with the an nual PM 2.5 NAAQS. For a PM 2.5 monitor to be representative at a neighborhood sca le, the concentration values measured by the monitor should be representa tive of concentrations expected over an area with dimensions of a few kilo meters. All of the PM 2.5 FRM monitors in California are sited to be representati ve of a neighborhood scale and meet this suitability requirement.

8.2 Review of changes to PM 2.5 network

The PM 2.5 network of FRM monitors in California was largely established in 1999 and completed in 2000. Little has changed in the s iting of the FRM monitoring network between then and now. However, in March of 2008, the U.S. EPA approved a continuous monitor as the first type of PM 2.5 FEM. A number of agencies around the State are now in various stages of purchasing and testdeploying these FEMs. One agency in the areas cove red by this report has submitted data from these monitors to the AQS datab ase. While there is interagency review of proposed changes to the State and Local Air Monitoring Stations (SLAMS) network, i.e., the network that in cludes PM 2.5 as well as O 3 , CO, PM 10 , and other pollutants, no unique review process ex ists specially for PM 2.5 FRM or FEM monitors. ARB requests the opportunity to review and comment on the possible regulatory consequences of any proposal to move or discontinue a monitor for any pollutant that violates a national or State air quality stand ard. Furthermore, when a local agency proposes to move or discontinue a monitor in dicating the highest concentrations of a pollutant in an area, ARB reque sts that the agency conduct a period of concurrent monitoring at that site and at the replacement site being proposed to represent the area as the required high site for the pollutant. This is expected even when the site is close to but not exc eeding any standard for the___________________________________________________ ____________________

29 2010 Annual Monitoring Network Report fo r Small Districts in California pollutant. The concurrent monitoring is typically for a period of many months or a year, depending on the pollutant, the standard that is of most concern, and other factors. The CFR requires that the U.S. EPA review and appro ve modifications to the SLAMS monitoring network, and requires that the res ponsible State or local agency inform the U.S. EPA of any proposed modifica tions. These requirements are in 40 CFR 58.14(b).___________________________________________________ ____________________

30 2010 Annual Monitoring Network Report fo r Small Districts in California Section 9. Proposed and recently implemented monit oring site changes This section lists the proposed and recently implem ented monitoring site changes in the areas included in this report, as we ll as changes to the monitoring sites that the ARB conducts in areas outside the st ated geographical scope of this report. Proposed monitoring site changes incl ude proposals by the ARB or by districts that are covered in this report to add , remove, or move sites and/or monitors in the monitoring network before the end o f 2011. Recently implemented monitoring site changes include deploye d sites and monitors in the monitoring network that the ARB has become aware of since last year’s report and for which no official 2009 data were reported. The scope of recently implemented monitoring site changes also includes t erminated sites and/or monitors that the ARB has become aware of since las t year’s report. The Kern County APCD added continuous PM 10 and ozone monitoring to the Tehachapi site. The district anticipates reporting the data to AQS and ARB in mid-2010. The Northern Sierra AQMD plans to add an ozone moni tor to the Truckee site to determine compliance with the air quality standards

. The Northern Sonoma County APCD is transitioning to real time monitoring for PM 10 at Cloverdale, Guerneville, and Healdsburg, howeve r, no data has yet been submitted to the AQS database. The continuous PM 10 BAMs will operate with each site’s existing filter PM 10 monitor for a period of time that will be determin ed by the district. The Tehama County APCD added a continuous PM 2.5 FEM to their monitoring network; however, no data has yet been submitted to the AQS database. The ARB plans to make the following changes:

• Relocate the Calexico-East site to another locatio n in Imperial County. In addition, the Calexico-Ethel site will need to be m oved from its current location to a more suitable site in the border area

.

• Relocate the PM 2.5 monitor at the Bakersfield-E Planz site.

• Close the Arvin-Bear Mountain Road site in the fal l of 2010, at the conclusion of parallel ozone monitoring. The Arvin -Di Giorgio site will become the long-term replacement site for Arvin Bea r Mountain Road.

• As part of the NCore requirements, the ARB plans t o add trace CO, trace SO 2 , NOy, PM Coarse, and PM speciation monitors to the Fresno-First Street site.___________________________________________________ ____________________

31 2010 Annual Monitoring Network Report fo r Small Districts in California • Deploy methane/CO2 instruments and trace CO analyz ers at ArvinDiGiorgio, Mount Wilson, Madera-Pump, and Tranquili ty for a special purpose monitoring.

• Assess whether to establish monitoring on Catalina Island for shipping impacts on air quality.

• Pesticide monitoring in Ventura County and Santa M aria.

• Toxics monitoring in Kettleman City, including mon itoring at a near by hazardous waste disposal facility. Moreover, ARB is planning to replace several filter -based PM2.5 FRM samplers and non-FEM BAMs with FEM BAMs as outlined in Table 7. The deployment began in late April and will continue until the fal l of 2010.

SITE PLANNED CHANGE
Replace non-FEM BAM with FEM BAM. Existing FRM will become a collocated FRM to a prim ary FEM BAM.

Stockton Replace FRM and non-FEM BAM with FEM BAM. Deploy another FEM BAM to run as a collocated.

San Andreas Replace FRM with FEM BAM.

Santa Barbara Replace FRM and District non-FEM BAM with FEM BAM.

Santa Maria Replace FRM and District non-FEM BAM with FEM BAM

Colusa Replace FRM and non-FEM BAM with FEM BAM.
San Luis Obispo Replace FRM and non-FEM BAM with FEM BAM.
Mojave-Poole Replace FRM with FEM BAM. Replace PM 10 SSI with FEM PM 10 BAM.

Bakersfield-E Planz Add non-FEM BAM to operate in parallel with existin g FRM. Modesto 

### Table 7

Planned Changes to PM 2.5 Monitors___________________________________________________ ____________________

32 2010 Annual Monitoring Network Report fo r Small Districts in California Section 10. Access to more information about the n etwork While this report includes a great deal of informat ion about the ambient air quality monitoring network, much more information is readil y available, including summaries of the pollutant data from the monitors a round the State. Much of this information is available on the web. This section lists a number of additional sources of such information. Also listed is contac t information for the agencies responsible for the monitoring covered in this repo rt. A broad overview of information about ambient air q uality data in general in a question and answer format can be found at the foll owing web page: http://www.arb.ca.gov/aqd/aqfaq / . This web page includes dozens of links to additional technical and non-technical information. ARB’s Monitoring and Laboratory Division (MLD) main tains web pages with information about all the existing monitoring sites that routinely monitor and submit air quality data in California. The pages a lso include detailed local maps showing the location of the sites. This informatio n can be found at http://www.arb.ca.gov/aaqm/mldaqsb/amn.htm . A more general MLD web page that provides links to other aspects of ambient mon itoring is located at http://www.arb.ca.gov/aaqm/aaqm.htm

. In addition to this report, there is another report that contains listings of monitoring in the State, along with the years for w hich data is available for each monitor and regional maps showing the locations of the monitoring sites. To view this report on the web, go to http://www.arb.ca.gov/aqd/netrpt/netrpt.htm

. ARB’s Planning and Technical Support Division (PTSD ) maintains this information. To view summaries of the official air quality data from sites around the State, go to http://www.arb.ca.gov/adam/welcome.html . For summaries of the data monitored today, yesterday, last week, and the last few months, go to http://www.arb.ca.gov/aqd/aqinfo.htm . These last two sources of information are maintained by the PTSD, as is the following more ge neral web page that lists links to other aspects of the ambient air quality d ata program: http://www.arb.ca.gov/aqd/aqdpage.htm

.___________________________________________________ ____________________

33 2010 Annual Monitoring Network Report fo r Small Districts in California Agency contact for ARB Regarding this report and questions relating to the collected ambient air quality data: Pheng Lee, Air Pollution Specialist, plee@arb.ca.gov , (916) 445-6059 Regarding the collection of the ambient data: Ken Stroud, Chief, Air Quality Surveillance Branch, kstroud@arb.ca.gov
, (916) 324-7591 Regarding quality oversight of the monitoring progr am: Merrin Wright, Manager, Quality Assurance Section, mwright@arb.ca.gov
, (916) 324-6191

Agency contacts for the air districts covered in th is report Amador County Air Pollution Control District, Jacks on, CA Jim Harris, Air Pollution Control Officer jharris@amadorapcd.org (209) 257-0112 Butte County Air Quality Management District, Chico , CA Gail Williams, Senior Air Quality Planner gwilliams@bcaqmd.org (530) 891-2882 Calaveras County Air Pollution Control District, Sa n Andreas, CA Lakhmir Grewal, Air Pollution Control Officer lgrewal@co.calaveras.ca.us (209) 754-6504 Colusa County Air Pollution Control District, Colus a, CA Harry Krug, Air Pollution Control Officer hak@countyofcolusa.org (530) 458-0590 El Dorado County Air Quality Management District, P lacerville, CA Marcella McTaggart, Air Pollution Control Officer marcella.mctaggart@edcgov.us (530) 621-6662___________________________________________________ ____________________

34 2010 Annual Monitoring Network Report fo r Small Districts in California Feather River Air Quality Management District, Mary sville, CA David Valler, Air Pollution Control Officer fraqmd@fraqmd.org (530) 634-7659 Glenn County Air Pollution Control District, Willow s, CA Kevin Tokunaga, Environmental Program Manager ktokunaga@countyofglenn.net (530) 934-6500 Kern County Air Pollution Control District, Bakersf ield, CA Dave Jones, Air Pollution Control Officer JonesDa@co.kern.ca.us (661) 862-5250 Lake County Air Quality Management District, Lakepo rt, CA Douglas Gearhart, Air Pollution Control Officer dougg@lcaqmd.net (707) 263-7000 Lassen County Air Pollution Control District, Susan ville, CA Joe Bertotti, Air Pollution Control Officer jbertotti@co.lassen.ca.us (530) 252-4247 Mariposa County Air Pollution Control District, Mar iposa, CA Charles Mosher, Air Pollution Control Officer air@mariposacounty.org (209) 966-2220 Mendocino County Air Quality Management District, U kiah, CA Christopher Brown, Air Pollution Control Officer mcaqmd@co.mendocino.ca.us (707) 463-4354 Modoc County Air Pollution Control District, Altura s, CA Joe Moreo, Air Pollution Control Officer apcd@modoccounty.us (530) 233-5522 Northern Sonoma County Air Pollution Control Distri ct, Healdsburg, CA Barbara Lee, Air Pollution Control Officer Randy Woodward, Air Pollution Specialist nsc@sonic.net (707) 433-5911___________________________________________________ ____________________

35 2010 Annual Monitoring Network Report fo r Small Districts in California Placer County Air Pollution Control District, Aubur n, CA Tom Christofk, Air Pollution Control Officer pcapcd@placer.ca.gov (530) 745-2330 Shasta County Air Quality Management District, Redd ing, CA Russ Mull, Air Pollution Control Officer scdrm@snowcrest.net (530) 225-5789 Siskiyou County Air Pollution Control District, Yre ka, CA Eric Olson, Air Pollution Specialist eolson@co.siskiyou.ca.us (530) 841-4029 Tehama County Air Pollution Control District, Red B luff, CA Carol Golsh, Air Pollution Control Specialist cgolsh@tehcoapcd.net (530) 527-3717 Tuolumne County Air Pollution Control District, Col umbia, CA Bill Sandman, Deputy Air Pollution Control Officer bsandman@co.tuolumne.ca.us (209) 533-5693 Yolo-Solano Air Quality Management District, Davis, CA Mat Ehrhardt, Air Pollution Control Officer meharhard@ysaqmd.org (530) 757-3673___________________________________________________ ____________________

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37 2010 Annual Monitoring Network Report fo r Small Districts in California 

### APPENDIX A

Regulatory language of 40 CFR 58.10

§ 58.10 Annual monitoring network plan and period ic network assessment. (a)(1) Beginning July 1, 2007, the State, or where applicable local, agency shall adopt and submit to the Regional Administrator an a nnual monitoring network plan which shall provide for the establishment and maintenance of an air quality surveillance system that consists of a network of S LAMS monitoring stations including FRM, FEM, and ARM monitors that are part of SLAMS, NCore stations, STN stations, State speciation stations, SPM statio ns, and/or, in serious, severe and extreme O 3 nonattainment areas, PAMS stations, and SPM monito ring stations. The plan shall include a statement of pur poses for each monitor and evidence that siting and operation of each monitor meets the requirements of appendices A, C, D, and E of this part, where appli cable. The annual monitoring network plan must be made available for public insp ection for at least 30 days prior to submission to EPA. (2) Any annual monitoring network plan that propose s SLAMS network modifications including new monitoring sites is sub ject to the approval of the EPA Regional Administrator, who shall provide opportuni ty for public comment and shall approve or disapprove the plan and schedule w ithin 120 days. If the State or local agency has already provided a public comme nt opportunity on its plan and has made no changes subsequent to that comment opportunity, and has submitted the received comments together with the p lan, the Regional Administrator is not required to provide a separate opportunity for comment. (3) The plan for establishing required NCore multip ollutant stations shall be submitted to the Administrator not later than July 1, 2009. The plan shall provide for all required stations to be operational by Janu ary 1, 2011. (4) A plan for establishing Pb monitoring sites in accordance with the requirements of appendix D to this part shall be su bmitted to the EPA Regional Administrator no later than July 1, 2009 as part of the annual network plan required in paragraph (a)(1) of this section. The p lan shall provide for the required source-oriented Pb monitoring sites to be operational by January 1, 2010, and for all required non-source-oriented Pb m onitoring sites to be operational by January 1, 2011. Specific site locat ions for the sites to be operational by January 1, 2011 are not required as part of the July 1, 2009 annual network plan, but shall be included in the a nnual network plan due to be submitted to the EPA Regional Administrator on July 1, 2010.___________________________________________________ ____________________

38 2010 Annual Monitoring Network Report fo r Small Districts in California (b) The annual monitoring network plan must contain the following information for each existing and proposed site: (1) The AQS site identification number. (2) The location, including street address and geog raphical coordinates. (3) The sampling and analysis method(s) for each me asured parameter. (4) The operating schedules for each monitor. (5) Any proposals to remove or move a monitoring st ation within a period of 18 months following plan submittal. (6) The monitoring objective and spatial scale of r epresentativeness for each monitor as defined in appendix D to this part. (7) The identification of any sites that are suitab le and sites that are not suitable for comparison against the annual PM 2.5 NAAQS as described in §58.30. (8) The MSA, CBSA, CSA or other area represented by the monitor. (9) The designation of any Pb monitors as either so urce-oriented or non-sourceoriented according to Appendix D to 40 CFR part 58. (10) Any source-oriented monitors for which a waive r has been requested or granted by the EPA Regional Administrator as allowe d for under paragraph 4.5(a)(ii) of Appendix D to 40 CFR part 58. (11) Any source-oriented or non-source-oriented sit e for which a waiver has been requested or granted by the EPA Regional Administra tor for the use of Pb-PM 10 monitoring in lieu of Pb-TSP monitoring as allowed for under paragraph 2.10 of Appendix C to 40 CFR part 58. (c) The annual monitoring network plan must documen t how States and local agencies provide for the review of changes to a PM 2.5 monitoring network that impact the location of a violating PM 2.5 monitor or the creation/change to a community monitoring zone, including a description of the proposed use of spatial averaging for purposes of making comparison s to the annual PM 2.5 - NAAQS as set forth in appendix N to part 50 of this chapter. The affected State or local agency must document the process for obtai ning public comment and include any comments received through the public no tification process within their submitted plan. (d) The State, or where applicable local, agency sh all perform and submit to the EPA Regional Administrator an assessment of the air quality surveillance system___________________________________________________ ____________________

39 2010 Annual Monitoring Network Report fo r Small Districts in California every 5 years to determine, at a minimum, if the ne twork meets the monitoring objectives defined in appendix D to this part, whet her new sites are needed, whether existing sites are no longer needed and can be terminated, and whether new technologies are appropriate for incorporation into the ambient air monitoring network. The network assessment must con sider the ability of existing and proposed sites to support air quality character ization for areas with relatively high populations of susceptible individuals (e.g., children with asthma), and, for any sites that are being proposed for discontinuanc e, the effect on data users other than the agency itself, such as nearby States and Tribes or health effects studies. For PM 2.5 , the assessment also must identify needed changes to population-oriented sites. The State, or where appl icable local, agency must submit a copy of this 5-year assessment, along with a revised annual network plan, to the Regional Administrator. The first asse ssment is due July 1, 2010. (e) All proposed additions and discontinuations of SLAMS monitors in annual monitoring network plans and periodic network asses sments are subject to approval according to §58.14.___________________________________________________ ____________________

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41 2010 Annual Monitoring Network Report fo r Small Districts in California 

### APPENDIX B

Acronyms

APCD Air Pollution Control District AQMD Air Quality Management District AQS Air Quality System ARB Air Resources Board CFR Code of Federal Regulations CBSA Core-Based Statistical Area FEM federal equivalent method FRM federal reference method MSA Metropolitan Statistical Area NAAQS National Ambient Air Quality Standard NO 2 nitrogen dioxide Pb lead PM 10 particulate matter (0 to 10 microns aerodynamic dia meter) PM 2.5 particulate matter (0 to 2.5 microns aerodynamic di ameter) PQAO primary quality assurance organization SIP State Implementation Plan SLAMS State and Local Air Monitoring Stations SO 2 sulfur dioxide U.S. EPA United States Environmental Protection Agency