## Ventura County Air Pollution Control District


# 2011 Ambient Air Monitoring Network Plan

July, 2011

Prepared By The Monitoring Division

Kent Field, Manager

Ventura County Air Pollution Control District 669 County Square Drive Ventura, CA 93003 (805) 645-14002011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD I MONITORING DIVISION 

### Table of Contents

1 Introduction ...............................................................................................1 2 Overview of Netw ork Operat ion................................................................2 2.1 Physical Setting And R egional Descri ption ..............................................2 2.2 VCAPCD Monitoring Stati ons...................................................................4 2.3 Monitoring Objectives And Spatial Scales................................................7 2.4 Minimum Monitoring Requirements..........................................................9 2.4.1 Ozone........................................................................................................9 2.4.2 PM 2.5 .......................................................................................................11 2.4.3 PM 10 ........................................................................................................12 2.4.4 PAMS......................................................................................................13 2.4.5 Carbon Mo noxide ....................................................................................13 2.4.6 Nitrogen Diox ide .....................................................................................14 2.4.7 Sulfur Dio xide..........................................................................................14 2.5 Local Monitoring Objectives And Local Spat ial Scal es ..........................14 3 Recent Or Pending Modifications To The Air Monitoring Network.........16 3.1 Discontinued Monitoring Statio n – Ventura–Emma Wood State Beach ................................................................................................................17 3.2 Pending Changes To The PM 2.5 Monitoring Network.............................17 3.3 Pending Changes To The PM 10 Monitoring Network .............................18 3.4 Pending Changes To The PAMS Network.............................................19 3.5 Pending Changes To The NO 2 Networ k.................................................20 3.6 Status Of SO 2 ..........................................................................................20 3.7 Status Of Lead........................................................................................21 3.8 Proposed Changes To The Speciati on Trends Netw ork (STN).............21 3.9 Pending Changes To T he Data Acquisition And Management System ................................................................................................................21 4 Required Quality Assurance Of The Monitoring Program......................22 5 Data Submission Requireme nts.............................................................24 5.1 Air Qualit y Data.......................................................................................24 Appendix A Detailed Station Information Detailed Station Information El Rio – Rio Mesa School #2 .....................................A-1 Detailed Station Information Ojai – Ojai Avenue .....................................................A-7 Detailed Station Information Piru – Pacifi c Avenue ...............................................A-11 Detailed Station Information Simi Valley – Cochra n Street...................................A-16 Detailed Station Information Thou sand Oaks – Moor park Road ..........................A-23 Detailed Station Information Ventur a - Emma Wood St ate Beach .......................A-28 Detailed Station Information Si mi Valley – Up per Air ............................................A-322011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD II MONITORING DIVISION 

### List of Tables
Table 1 -Air Monitoring Stations, R egions Served And Pollutants Monitored in 2010 ..................................................................................................................6 Table 2 - Monitoring Objectives And Appropriate Sp atial Sc ales................................8 Table 3 – Pollutants, Monitoring Objectives And Sp atial Sc ales.................................8 Table 4 – Ozone: Number of Days > T han The Level Of The 8-Hour NAAQS and National Desi gn Valu es .............................................................................................10 Table 5 – Ozone: Minimum M onitoring Requi rements.............................................11 Table 6 - PM 2.5 : Annual 98 th Percentile 24-Hour Averages And 24-Hour National Design Va lues ............................................................................................................11 Table 7 - PM 2.5 : Annual Weighted Means And Annual National Design Values......11 Table 8 - PM 2.5 : Minimum Monitori ng Requireme nts................................................12 Table 9 – PM 10 : Annual Maximum 24-Hour Aver ages And 3-Year Average Of Annual Estimate d Exceedanc es................................................................................12 Table 10 - PM 10 : Minimum Monitori ng Require ments ..............................................13 Table 11 - Local Air Monitoring R egions - Area and Popu lation Se rved..................15 Table 12 – CY-2012 PM 2.5 Comparison Study..........................................................18 Table 13 – CY-2013 Pending Final PM 2.5 Networ k ...................................................18 Table 14 – CY-2012 PM 10 Comparison Study ..........................................................19 Table 15 – CY-2013 Pending Final PM 10 Network....................................................19 Table 16 - Sources Of Ambi ent Air Qua lity Da ta.......................................................24 Appendix A Detailed Station Information Table 17 – El Rio PM 2.5 Annual Maximu m Averages ..............................................A-2 Table 18 – El Rio PM 10 Annual Maximum 24-H our Avera ges ................................A-3 Table 19 – El Rio Stat ion Information......................................................................A-3 Table 20 – El Rio Moni tor Informat ion.....................................................................A-4 Table 21 – Ojai PM 10 Maximum 24-Hou r Averages................................................A-8 Table 22 – Ojai Stat ion Informat ion.........................................................................A-9 Table 23 – Ojai Moni tor Information ........................................................................A-9 Table 24 – Piru – Pacific Avenue PM 2.5 Maximum Av erages ...............................A-12 Table 25 – Piru Stat ion Informat ion.......................................................................A-13 Table 26 – Piru Moni tor Information ......................................................................A-13 Table 27 – Simi Valley PM 2.5 Maximum Av erages ................................................A-17 Table 28 – Simi Valley PM 10 Annual Maximum 24- Hour Aver ages......................A-18 Table 29 – Simi Valley St ation Inform ation............................................................A-18 Table 30 – Simi Valley M onitor Inform ation...........................................................A-19 Table 31 – Thousand Oaks PM 2.5 Maximum Av erages........................................A-24 Table 32 – Thousand Oaks Station Inform ation....................................................A-252011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD III MONITORING DIVISION 

### List of Tables - Continued

Table 33 – Thousand Oaks Monitor Inform ation...................................................A-25 Table 34 – Ventura Stat ion Informat ion.................................................................A-29 Table 35 – Ventura Mo nitor Informa tion................................................................A-30 Table 36 – Simi Valley – Upper Air Station Info rmation ........................................A-322011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD IV MONITORING DIVISION 

### List of Figures
Figure 1 – VCAPCD Monitoring Regions And Ambient Monito ring Stations ..............5 Figure 2- Historic Ozone Tren ds: National Design Value (3 Year Average Of 4 th Highest Annual Maximum 8-Hour Av erage)..............................................................10 Appendix A Detailed Station Information Figure 3 - Ozone Trends Summary: El Rio-Rio Mesa School #2 ...........................A-2 Figure 4 – Map Showing Location Of El Rio – Rio Mesa School #2.......................A-6 Figure 5 - Ozone Trends Summar y: Ojai - Oj ai Avenue .........................................A-8 Figure 6 – Map Showing Location Of Ojai – Oj ai Avenue .....................................A-10 Figure 7 - Ozone Trends Summary: Piru – Paci fic Avenue .................................A-12 Figure 8 – Map Showing Location Of Piru – Pacifi c Avenue.................................A-15 Figure 9 - Ozone Trends Summary: Simi Valley-Coc hran Street .........................A-17 Figure 10 – Map Showing Location Of Simi Valley – Co chran Str eet...................A-22 Figure 11 - Ozone Trends Summary: Thousand Oaks-Moo rpark Road...............A-24 Figure 12 – Map Showing Location Of Thousand Oaks – Moorpark Road..........A-27 Figure 13 - Ozone Trends Summary: Ve ntura-Emma Wood State Beach...........A-29 Figure 14 – Map Showing Location of Ve ntura – Emma Wood State Beach.......A-31 Figure 15 – Map Showing Location Of Simi Valley – Upper Ai r............................A-322011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD V MONITORING DIVISION 

### Definition of Terms
AQS Air Quality System ARM Approved Regional Method BAM Beta Attenuation Monitor CARB California Air Resources Board CFR Code of Federal Regulations CMSA Consolidated Metr opolitan Statistical Area CO Carbon Monoxide DV Design Value EPA U. S. Environm ental Protection Agency FEM Federal Equivalent Method FRM Federal Reference Method NAAQS National Ambient Air Quality Standards NMHC Non-Methane Hydrocarbons NO2 Nitrogen Dioxide O3 Ozone PAMS Photochemical Asse ssment Monitoring Systems PM Particulate Matter PM 2.5 Particulates less than or equal to 2.5 microns in size PM 10 Particulates less than or equal to 10 microns in size SIP State Im plementation Plan SLAMS: State and Loca l Air Monitoring Stations SO2 Sulfur Dioxide VCAPCD Ventura County Air Pollution Control District2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 1 MONITORING DIVISION 

### 1 Introduction

The Ventura County Air Pollution Contro l District’s (VCAPCD) 2010 Ambient Air Monitoring Network Plan is an examinati on and evaluation of the VCAPCD’s network of ambient air pollution moni toring stations. This annual review of the VCAPCD’s SLAMS (State and Local Air M onitoring Station) air monitori ng network is required by Title 40, Code of Federal R egulations, Part 58.10 (40 CFR 58.10). The report meets requirements for an annual network plan as listed in 40 CFR 58.10 Appendix A.
As required by the regulati ons, this report includes m onitors which are federal reference methods (FRM) or federal equivalent methods (F EM). While the CFR also requires reporting of approved regional me thods (ARM), no ARMs are in operation within VCAPCD at this time. The terms FRM, FEM, and ARM denote monitoring instruments that produce m easurements of the ambient pollution levels that the regulations allow to be compared to the NAAQS’s for regulatory purposes.
Federal Regulations require specific deta iled monitoring netw ork information be included. It includes a review of actions taken during 2010 and plans for action in the year ahead. The regulations r equire that the report be subm itted to EPA in July of each year.
This report will be available for a 30 day public inspection peri od, with comments to be submitted to the EPA. This report may be viewed on the VCAPCD’s web site, www.vcapcd.org and hardcopies are available for review at VCAPCD’s office. For 2011, comments will be received and forward ed to EPA through August 15, 2011. Written comments should be s ubmitted to Kent Field, Monitoring Division Manager at, kent@vcapcd.org, (805) 662-6960 and CC: to Herm Ragsdale at herm@vcapcd.org (808) 662-6954.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 2 MONITORING DIVISION 

### 2 Overview of Network Operation

The VCAPCD operates six air monitoring st ations and one upper air profiler within Ventura County. The VCAPCD’s SLAMS mo nitoring network has been designed to provide ozone, PM 2.5 and PM 10 monitoring coverage to the majority of the inhabited regions of Ventura County. The VCAPCD ha s conducted air monito ring for ozone or oxidants in Ventura County since 1963. This monitoring network plays a critical role in assessing Ventura County’s clean ai r progress and in determining pollutant exposures throughout Ventura County.
2.1 Physical Setting And Regional Description
Ventura County is located al ong the southern portion of th e central California coast between Santa Barbara and Los Angeles C ounties. Its diverse topography is characterized by mountain ranges to the north, two ma jor river valleys (the Santa Clara, which trends east-west, and the Ventura, which trends roughly north-south), and the Oxnard Plain to the s outh and west. As pollutants are carried into the inland valleys by prevailing winds, they are fr equently trapped against t he mountain slopes by a temperature inversion layer, gener ally occurring between 1500 and 2500 feet above sea level. Above the temperature inve rsion layer, pollutants are allowed to disperse freely. Our air monitoring stat ions are therefore fo und between the coast and the inland valley mountain foothills up to approximately 1000 feet.

Ambient concentration data are collected for a wide variety of pollutants. The most important of these in the VCAPCD are ozone (O 3 ), fine particulate ma tter of a size of 2.5 micrometers or less (PM 2.5 ), and particulate matter of a size of 10 micrometers or less (PM 10 ). Other pollutants measured include oxides of nitrogen (NOx, NO and NO 2 ), total NMHC, Speciated PM 2.5 , Toxics (Cr6+, total metals and aldehydes) VOCs, and Carbonyls. Meas urements of meteorologica l parameters is also conducted at all monitoring stat ions. Data for all of the pollutants is needed to better understand the nature of the ambient air quality in V entura County, as well as to inform the public regarding the quality of the air.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 3 MONITORING DIVISION Not all pollutants are monitor ed at all stations. Most stat ions monitor for multiple pollutants, while some stat ions monitor only one or tw o pollutants. A particular station’s location and monitoring purpose de termine the actual pollutants measured at that station.
The majority of the population 1 resides in the southern half of Ventura County – the VCAPCD has focused its air monitoring effo rts there. The s outh half of Ventura County is divided into six air monitoring regi ons: Ventura Coastal, Oxnard Plain, Ojai Valley, Santa Clara River Valley, Simi Valley, and the Conejo Valley. The VCAPCD’s air monitoring network has been designed to provide air monitoring coverage to those region s of Ventura County.

Ventura Coastal - a coastal area, which cove rs 119 square miles and has a population of 234,275 people. The Ventura Coastal monito ring area represents an area that borders the Pacifi c Ocean, with Santa Barbara County to the west. This area encompasses the city of Port Hueneme and portions of the cities of Ventura and Oxnard. Some agricult ural activities occur in the V entura Coastal area. Emission sources within the area include a deepwater port and a number of Ventura County’s major stationary sources 2 , including two natural gas-fir ed electric generating units, two naval bases and several natural gas-fired cogeneration facilities. In addition to stationary sources, the ar ea is impacted by mobile sources and marine shipping operations occurring off of Ventura County’s coast. Th is area is served by the VCAPCD’s monitoring statio n at the Emma Wood Stat e Park group campground, west of Ventura.

Oxnard Coastal Plain – a broad coastal area from the Pacific Oc ean to several inland valleys, covering 286 square miles and has a population of 198,9 70 people. The Oxnard Coastal Plain area is a relatively flat plain area with foothills and mountains at its northern border. The Oxnard Coastal Plain is home to considerable agricultural activities. Emission sources within t he area include several of Ventura County’s major stationary sources, in cluding natural gas-fired cogenerat ion facilities, several oil and gas production and processing facilities, and a paper products manufacturer. Its air quality is influenced by emission source s in the Ventura Coastal area that include a deepwater port, two natural gas-fired elec tric generating units, two naval bases, and several natural gas-fired c ogeneration facilities. The ar ea is impacted by marine shipping operations occurring off of Ventur a County’s coast and mobile sources. This area is served by the VCAPCD’s moni toring station at Rio Mesa High School, Central Avenue, in Oxnard.

1 All population estimates in this doc ument are based on the 2010 US census. 2 For the purpose of this report a major stationary source is co nsidered to be a facility that has been issued a federal Part 70 operating permit (also referred to as a Title V permit).2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 4 MONITORING DIVISION Ojai Valley – an inland area including the City of Ojai and the co mmunities of OakView, and Meiners Oaks, which covers 102 square miles and is home to 27,784 people. The Ojai Valley is surrounded by mo untain ranges. There is one major stationary source on the southeastern edge of the regi on; however, it may be influenced by oil production acti vities occurring to the sout h, in the Ventura Coastal area. The area is impacted pr imarily by mobile sources. The Ojai Valley is served by the VCAPCD’s monitoring station at Vent ura County fire station, Ojai Avenue, in Ojai.
Santa Clara River Valley – an inland area, covering 204 square miles and home to 45,107 people. The Valley is surrounded by foothills and low-lying mountains. The eastern edge of the Santa Clara River Va lley is the border between Ventura and Los Angeles Counties. The area is also home to considerable agricultural activities. There are oil production and processing activi ties occurring thr oughout the Valley. There are two major stati onary sources in its boundaries. The area is impacted primarily by mobile sources. This area is served by t he VCAPCD’s monitoring station on Pacific Avenue, in Piru.
Simi Valley – an inland area, which covers the citi es of Simi Valley and Moorpark, is 142 square miles and is home to 162,683 peopl e. Simi valley is surrounded by foothills and low-lying mountains. The easte rn edge of the Simi Valley is the border between Ventura and Los Angeles Counties. There are two major stationary sources in its boundaries. The area is impacted primarily by mobile sources. This area is served by the VCAPCD’s monitoring station at Simi Valley High School, on Cochran Street, in Simi Valley.
Conejo Valley – an inland area, which includes the city of Thousand Oaks and the communities of Westlake Village and New bury Park, covering 75 square miles and home to 153,680 people. The area is surrounded by foothills and low-lying mountains. The eastern edge of the Conejo Valley is t he border between Ventura and Los Angeles Counties. Ther e are no major stat ionary sources in its boundaries. The area is impacted pr imarily by mobile sources. This area is served by the VCAPCD’s monitoring station at Thousand Oaks High School, Moorpark Road, in Thousand Oaks.
2.2 VCAPCD Monitoring Stations
Figure 1 shows Ventura Count y’s air monitoring regions and the locations of the monitoring stations. Table 1 lists the pollutants measur ed in 2010 at eac h station, the region the station represents and the assigned Ai r Quality System (AQS) identification number for each monitoring station2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 5 MONITORING DIVISION Figure 1 – VCAPCD Monitoring Regions And Ambient Monitoring Stations2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 6 MONITORING DIVISION Table 1 -Air Monitoring Stations, Regi ons Served And Pollutants Monitored in 2010

Station Name AQS ID Pollutant Monitored El Rio – Rio Mesa School #2 Region: Oxnard Coastal Plain 061113001 Ozone, NO 2 , Total NMHC, PM 10 , Non-FEM BAM PM 2.5 , FRM PM 2.5 , VOCs, Carbonyls, Meteorology

Ojai – Ojai Avenue Region: Ojai Valley 061111004 Ozone, Non-FEM BAM PM 2.5 , PM 10 , Meteorology

Piru – Pacific Avenue Region: Santa Clara River Valley 061110009 Ozone, Non-FEM BAM PM 2.5 , FRM PM 2.5 , Meteorology

Simi Valley – Cochran Street Region: Simi Valley 061112002 Ozone, NO 2 , Total NMHC, PM 10 , Non-FEM BAM PM 2.5 , FRM PM 2.5 , Speciated PM 2.5 , Toxics (Cr6+, total metals and aldehydes ) VOCs, Meteorology

Simi Valley Upper Air Profiler 061110008 Meteorology

Thousand Oaks – Moorpark Road Region: Conejo Valley 061110007 Ozone, non-FEM BAM PM 2.5 , FRM PM 2.5 , Meteorology

Ventura – Emma Wood State Beach Region: Ventura Coastal 061112003 Ozone, Meteorology

The primary purposes of the VCAPCD’s air monitoring net work are: (1) to determine Ventura County’s attainment status for the National and California standards for ozone, PM 2.5 and PM 10 ; (2) to track Ventura County’s air quality tr ends; (3) to provide information to the public about the quality of Ventura County’s air quality (i.e., reporting of the Air Quality Index and ozone episode forecasti ng), and; (4) fo r data in air quality modeling efforts.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 7 MONITORING DIVISION 2.3 Monitoring Objectiv es And Spatial Scales
As described by federal regul ations, the monitoring objective s that the monitors in a monitoring network are to ac hieve include the following:
1. To determine the highest concentration expected to occur in the area covered by the network; 2. To determine representative concentr ations in areas of high population density; 3. To determine the impact on ambient pollution levels of significant sources or source categories; 4. To determine general ba ckground concentration levels; 5. To determine the extent of regi onal pollutant trans port among populated areas, and in support of secondary standards. 6. To determine the welfare-related im pacts in more rural and remote areas (such as visibility impairment and effects on vegetation).
The physical siting of an air monitoring st ation must achieve a spatial scale of representativeness that is c onsistent with the monitoring objective of the monitor. The spatial scale results from the physical location of the statio n with respect to the pollutant sources. It estimates the size of the area surrounding the monitoring station that experiences uniform pollutant concentrations.
The categories of spatial scale are:
1. Microscale - An area of uniform pollu tant concentrations ranging from several meters up to 100 meters. 2. Middle Scale - Uniform pollutant conc entrations in an ar ea of about 100 meters to 0.5 kilometer. 3. Neighborhood Scale - An area with dimens ions in the 0.5 to 4.0 kilometer range. 4. Urban Scale - Citywide pollutant conditi ons with dimensions ranging from 4 to 50 kilometers. 5. Regional Scale – A large area, usually rural, of the sa me general geography and without large sources that extends from tens to hundreds of kilometers.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 8 MONITORING DIVISION Table 2 - Monitoring Objectives And Appropriate Spatial Scales
Monitoring Objective Appropriate Spatial Scale Highest concentration Micro, Middle, Neighborhood Population oriented Neighborhood or Urban Source Impact Micro, middle, neighborhood General/background leve ls Urban, regional Regional transport Urban, regional Welfare-related impac ts Urban, regional

Table 3 shows each of the VCAPCD’s air monito ring stations and its criteria pollutant objective and spatial scales.
Table 3 – Pollutants, Monitoring Objectives And Spatial Scales
Monitoring Objectives and Spatial Scale Pollutant Monitoring Station Highest Concentration Population Background Spatial Scale
El Rio 9 Urban Ojai 9 Urban Piru 9 Urban Simi Valley 9 Urban Thousand Oaks 9 UrbanOzone

Ventura - Emma Wood 9 Neighborhood

El Rio 9 UrbanNO2 Simi Valley 9 Urban El Rio 9 Neighborhood Piru 9 Neighborhood Simi Valley 9 NeighborhoodPM2.5

Thousand Oaks 9 Neighborhood

El Rio 9 Neighborhood Ojai 9 UrbanPM10 Simi Valley 9 Neighborhood2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 9 MONITORING DIVISION 2.4 Minimum Monitoring Requirements
Certain monitoring requirements in 40 CFR 58 are based upon Metropolitan Statistical Areas (MSAs). M SAs are part of a population, economic and social-based classification of geographical regions dev eloped by the U.S. Census Bureau. An MSA may include one or more counties. Howe ver, not all counties are within an MSA. The VCAPD contains a single M SA, the Oxnard-Thousand Oaks-Ventura MSA.
40 CFR 58.10, Appendix D specifies the mini mum requirements fo r air monitoring networks. As shown in Tables 4, th rough 10, the VCAPCD air monitoring network meets or exceeds the minimum m onitoring requirements for ozone, PM 2.5 and PM 10 and PAMS. There are no mi nimum requirements for NO 2 , CO or SO 2
.
2.4.1 Ozone
Ventura County is a serious nonattainment area for ozone. The VCAPCD monitors for ozone at all six of its air monitoring st ations. The NAAQS fo r ozone is based on the 4 th highest annual 8-hour maximum average in parts per million (ppm) (level: .075) and was adopted by EPA on March 12, 2 008. The ozone NAAQS is attained when the 4 th highest annual maximum 8-hour average, averaged over three years is equal to or less than the level of the NAAQS at all monitori ng stations. The level of the NAAQS has been exceeded at various monitoring stati ons in Ventura County. The ozone NAAQS is exceeded mo st frequently at Simi Va lley, followed by Ojai and Piru. El Rio and Ventur a-Emma Wood exceed the oz one NAAQS infrequently and record similar levels of ozone.
County-wide ozone design values and the annual number of days exceeding the level of the NAAQS have cont inued to decline in spite of increasing population and vehicle miles in Ventura C ounty. Ozone trends for each air monitoring station are shown in Appendix A. The 2010 county-wide 8-hour national design value is .086 ppm, a decline from .132 ppm in 1985. In 2002 Ventura County attained the 1-hour ozone NAAQS with a 1-hour ozone nati onal design value of .124 ppm.
In 2010 the VCAPCD operated oz one monitors at six air monitoring stations in Ventura County. Table 4 co ntains the annual number of da ys exceeding the level of the NAAQS and the national design values, Fi gure 2 is a graph of historic ozone trends, the national design va lue (3 year average of 4 th annual maximum 8-hour average).2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 10 MONITORING DIVISION Table 4 – Ozone: Number of Days > Than The Level Of The 8-Hour NAAQS and National Design Values

Days > Level Of 8-Hour NAAQS National Design Values (3 Year Average Of 4 th Highest Annual Maximum) Air Monitoring Station 2007 2008 2009 2010 2007 2008 2009 2010 El Rio 0 0 1 0 .061 .061 .062 .063 Ojai 4 12 11 7 .085 .083 .078 .079 Piru 4 11 11 1 .081 .080 .080 .079 Simi Valley 19 27 24 8 .088 .088 .087 .086 Thousand Oaks 2 6 5 6 .075 .075 .077 .078 Ventura 1 0 0 0 .063 .064 .064 .063

0.06 0.07 0.08 0.09

0.1 0.11 0.12 0.13 0.14 0.15

1988 19 9 0 1 9 92 1994 1996 1998 2000 2 0 02 2 0 04 2006 2008 2010Ozone in Parts per Million

Figure 2- Historic Ozone Trends: National Design Value (3 Year Average Of 4 th Highest Annual Maximum 8-Hour Average)2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 11 MONITORING DIVISION As shown in Table 5 the VCAPCD’s air monitoring network ex ceeds the minimum monitoring requirement for ozone established in 40 CFR Part 58.
Table 5 – Ozone: Minimum Monitoring Requirements

MSA Population (2010) 8-Hour Design Value (2010) Min. # Monitors Required # Monitors

Active # Monitors Needed
OxnardThousand Oaks-Ventura MSA 822,499 .086 2 5* 0

*This number reflects the discontinuation of ozone monito ring at Ventura-Emma Wood State Beach April 28, 2011.

2.4.2 PM 2.5
The VCAPCD’s PM 2.5 monitoring network consists of four stations using FRM PM 2.5 monitors and five statio ns using continuous Non-FE M Beta-Attenua tion Method (BAM) PM 2.5 monitors. The 24-hour NAAQS for PM 2.5 is based on the 98th percentile 24-hour average, in μg/m 3 (level: 35). The annual PM 2.5 NAAQS is based on the annual weighted mean of the 24-hour averages, in μg/m 3 (level: 15). Table 6 and Table 7 contain annual PM 2.5 statistics for Ventura County.

Table 6 - PM 2.5 : Annual 98 th Percentile 24-Hour Averages And 24-Hour National Design Values

Annual 98 th Percentile 24- Hour Averages 24-Hour Design Values Air Moitoring Station 2007 2008 2009 2010 2007 2008 2009 2010 El Rio 27.5 19.7 18.9 16.5 25 24 22 18 Piru 22.3 17.0 18.8 16.3 21 20 19 17 Simi Valley 31.8 25.7 20.5 17.4 29 28 26 21 Thousand Oaks 24.9 20.7 21.1 21.3 24 23 22 21

Table 7 - PM 2.5 : Annual Weighted Means And Annual National Design Values
Annual Weighted Means Annual Design Values Air Moitoring Station 2007 2008 2009 2010 2007 2008 2009 2010 El Rio 10.6 10.1 10.2 8. 7 10.3 10.2 10.3 9.6 Piru 10.2 9.8 9.5 8. 5 9.6 9.8 9.8 9.22011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 12 MONITORING DIVISION Annual Weighted Means Annual Design Values Air Moitoring Station 2007 2008 2009 2010 2007 2008 2009 2010 Simi Valley 11.7 10.7 10.3 8.7 11.1 10.9 10.9 9.9 Thousand Oaks 10.5 10.3 10.7 8. 5 10.3 10.2 10.5 9.9

Table 8 shows that the VCAPCD’s air m onitoring network ex ceeds the minimum monitoring requirements establis hed in 40 CFR Pa rt 58 for PM 2.5
.
Table 8 - PM 2.5 : Minimum Monitoring Requirements

MSA Population (2010) Ann. Design Value (2010) 24-Hr Design Value (2010) # Monitors Required # Monitors

Active # Monitors NeededOxnardThousandOaksVentura MSA 822,499 9.9 21 1 5* 0

*This number reflects the pending initiation of FEM PM 2.5 monitoring at Ojai-Ojai Avenue January 1, 2012.

2.4.3 PM 10
For PM 10 , the annual maximum 24-hour average in Ventura County during the years 2000 through 2010 is 248 μg/m 3 (10/21/2007). However, this average has been flagged as an exceptional event. Docu mentation has been submitted to EPA through CARB to justify that this exc eedance was an exceptional event. The next highest average in the years 2000 through 2010 is 169 μg/m 3 (11/23/2003). The PM 10 data for the 24-h our NAAQS in μg/m 3 (level: 150) is shown Table 9.

Table 9 – PM 10 : Annual Maximum 24-Hour Av erages And 3-Year Average Of Annual Estimated Exceedances
Annual Maximum 24-Hour Averages 3- Year Average of Annual Estimated Exceedances Air Monitoring Station 2007 2008 2009 2010 2007 2008 2009 2010 El Rio 248* 80 100 62 0 0 0 0 Ojai 99* 61 38 45 0 0 0 0 Simi Valley 117* 80 75 3 31 4 2 2 2 0 *Flagged as an “Exceptional Event”

3 The annual maximum 24-hour average fr om the collocated sampler was 77 4 The annual maximum 24-hour average fr om the collocated sampler was 342011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 13 MONITORING DIVISION Table 10 shows that the VCAPCD’s air m onitoring network ex ceeds the minimum monitoring requi rements for PM 10 established in 40 CFR Part 58.

Table 10 - PM 10 : Minimum Monitoring Requirements

MSA Population (2010) Min. # Monitors Required # Monitors Active # Monitors Needed
Oxnard-Thousand Oaks-Ventura MSA 822,499 1 - 2 2* 0

*This number reflects the discontinuation of FRM PM 10 monitoring at Oai-Ojai Avenue on December 31, 2011.

2.4.4 PAMS

The Photochemical Assessment Monitoring System (PAMS) program provides more comprehensive data on ozone air pollution in areas classified as serious, severe or extreme nonattainment for ozone than would otherwise be achieved through the SLAMS monitoring stations.
The PAMS program includes meas urements for ozone , oxides of nitrogen, speciated VOCs, trace CO, NOy, continuous non-methane hydrocarbon (NMHC) and meteorology. 40 CFR 58, Appendix D, Sectio n 5 specifies the network design for the PAMS program. We have not installed the trace CO and NO y instrumentation due to wide spread questioning by Federal and stat e air agency staff of the rationale of monitoring NOy and trace CO in Southern California.. Additionally, any changes to our existing PAMS network are on hold unt il EPA updates the requirements for the PAMS program as advised by EPA Region 9 in an April 28, 2011 email from Meredith Kurpius, PhD, Air Division. In 2010 the VCAPCD’s PAMS monitoring network was comprised of the Ventura (Typ e 1), El Rio (Type 2) and Simi Valley (Type 3) air monitoring stat ions. Ventura County is now required to operate one each of a Type 2 and 3 PAMS site.
The VCAPCD operates its PAMS program according to t he California Alternative Plan (CAP III). Under CAP III the sampling cannister sampling schedule is every third day during the months of July August and September. Additionally, the VCAPCD operates its PAMS program on days that the maximum 8-hour average ozone is predicted to exceed .075 ppm.

2.4.5 Carbon Monoxide
The VCAPCD previously operated monitors to measure levels of CO at the El Rio and Simi Valley monitoring stations. Bec ause of the low levels recorded, CO monitoring at these stat ions was discontinued in Ma rch and July 2004.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 14 MONITORING DIVISION 40 CFR 58, Appendix D, Sectio n 4.2 states that there are no minimum requirements for the number of CO monitori ng sites. There are no CO monitors required for SIP or maintenance planning.
2.4.6 Nitrogen Dioxide
The VCAPCD previously operated monitors to measure levels of nitrogen dioxide (NO 2 ) at the Ojai, Vent ura and Thousand Oaks monitoring stations. Because of the low levels recorded, NO 2 monitoring at these stations was discontinued in July 2004. The VCAPCD currently monitors for NO 2 at El Rio and Simi Valley monitoring stations.
40 CFR 58, Appendix D, Sectio n 4.3 states that there are no mini mum requirements for the number of NO 2 monitoring sites. There are no NO 2 monitors required for SIP or maintenance planning.

2.4.7 Sulfur Dioxide
The VCAPCD previously oper ated a monitor to meas ure sulfur dioxide (SO 2 ) at the El Rio monitoring station. Becaus e of the low levels recorded, SO 2 monitoring was discontinued in July 2004.
40 CFR 58, Appendix D, Sectio n 4.4 states that there are no mini mum requirements for the number of SO 2 monitoring sites. There are no SO 2 monitors required for SIP or maintenance planning.
2.5 Local Monitoring Objecti ves And Local Spatial Scales
Each of the VCAPCD’s air monitoring stations has at a minimum an ozone monitor. Monitors at some stations include FRM PM 2.5 monitors, continuous non FEM PM 2.5 BAM monitors, FRM PM 10 monitors and monitors for co ntinuous NMHC, and oxides of nitrogen (NO, NOX, NO 2 ). The VCAPCD has located each of its air monitoring stations in relation to s pecific geographic areas of V entura County (Section 2.1), depending upon each area’s population, topography and meteorology. Because the north-half of Ventura County is mountai nous and sparsely populated (819 people), no air monitoring stations are located in that area. Because the VCAPCD has designed its network with consideration given to the distinct geog raphic, topographic and meteorological areas of Ventura County, the areas and population served by the VCAPCD’s air monitoring stations vary great ly. The local monito ring objective for VCAPCD’s monitoring stations is reporting the Air Qualit y Index (AQI) and for ozone episode forecasting. The local spatial sca le for VCAPCD’s moni toring stations is regional as previously described. Table 11 contains the local regions and population served by each of its air monitoring stations.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 15 MONITORING DIVISION Table 11 - Local Air Monitoring R egions - Area and Population Served

Station Name and Region Served AQS ID Area Served (Sq. Miles) Population Served Population Density (Pop./Sq. Mi) El Rio – Rio Mesa School #2 Region: Oxnard Coastal Plain 061113001 286 198,970 1025

Ojai – Ojai Avenue Region: Ojai Valley 061111004 102 27,784 300

Piru – Pacific Avenue Region: Santa Clara River Valley 061110009 204 45,107 180

Simi Valley – Cochran Street Region: Simi Valley 061112002 142 160,576 1131

Thousand Oaks – Moorpark Road Region: Conejo Valley 061110007 75 153,680 2000

Ventura – Emma Wood State Beach Region: Ventura Coastal 061112003 119 234,275 15682011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 16 MONITORING DIVISION 

### 3 Recent And Pending Modifica tions To The Air Monitoring Network

40 CFR 58.14(b) requires that the EPA re view and approve modi fications to a SLAMS monitoring network, and requires the responsible state or local agency to inform the EPA of any proposed modificati ons. This provides an opportunity for review and comment on the possible r egulatory consequences of such action. Furthermore, the VCAPCD generally would c onduct a period of parallel sampling of monitors or if a station is moved, at the current statio n and the proposed station for a term of several months to one year, dependi ng upon the pollutant, the NAAQS that is of most concern, and on othe r factors. In order to ma ke more effective use of VCAPCD resources, consideration is being gi ven to reducing some operations of the monitoring network and maki ng changes in our monitoring methods in the coming year(s).
The monitoring methods for particulate matter (PM 2.5 and PM 10 ) are currently going through a transition. During the coming year the VCAPCD will begin the transition from the manual collection of particulates on a filter ov er a 24 hour period to automated continuous particulate monitors. The new monitoring method will allow us to monitor more efficient ly and effectivley by prov iding continuous data and eliminating the processing of filters,
The VCAPCD is also rehabilitating our air monitoring netw ork by replacing instrumentation due to the analyzer and equipment problems that have developed over the years. Wi th the initial establishment of the PAMS program in the mid 1990’s, equipment was purchased to meet its goals. Over the past 15 years the equipment has aged and exceeded t heir 5 year life spans. Our in-house technical expertise was able to extend those life spans to more than 10 years, but that equipment has finally failed and is now being replaced.
As our entire economy and gover nmental agencies face the reality of doing more with less resources, we are tr ying to maximize efficiency. We are improving our data2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 17 MONITORING DIVISION acquisition system by adding the capabilit y to connect to individual air quality analyzers from the office mini mizing the need to travel to the air monitoring stations as often. We are also updating our data management system giving our data and station technicians more capabilities to aut omate the collection and processing of air quality and quality assurance data.
Additional changes are forthcom ing. EPA is requiring the establishment of near-road NO 2 monitoring by 2013. Our PAMS progra m is on hold until EPA annouces new monitoring requirement s later this year to reshape and refocus th e PAMS program. We are continuing to perform sampling fo r the Speciation Trends Network, while working with EPA on scheduling and quality assurance improvements.
3.1 Discontinued Monitoring Stat ion – Ventura–Emma Wood State Beach
As Ventura County’s air quality continues to improve, El Rio ozone concentrations have shown to be representativ e of Ventura Coastal regi on ozone within a few ppb. Due to the ongoing costs of oper ating the Ventura station and due to siting issues the Ventura station discontinued monitoring on April 28, 2011. A letter requesting closure of the Ventura-Emma Wood State Beach air moni toring station was sent to EPA Region 9 on March 3, 2011. Our request was approved by EPA Region 9 in a letter from Matthew Lakin, M anager Air Quality Analysis Offi ce, dated April 4, 2011. The station was closed following the CA RB’s annual performance audit (April 27, 2011).
3.2 Pending Changes To The PM 2.5 Monitoring Network
As shown in Section 2.4.2, VCAPCD operates five FRM PM 2.5 samplers at four monitoring stations (one sampler is collocated at th e Thousand Oaks monitoring station). The first step in changing PM 2.5 monitoring methods is to replace the VCAPCD’s current automated continuous non-FEM PM 2.5 Beta Attenuation Method (BAM) monitors with automated continuous PM 2.5 BAM monitors that have been designated a Federal Equivalent Method (F EM) ) at Piru, Thousand Oaks and El Rio and to initiate a continuous PM 2.5 BAM FEM monitor at Ojai. The FEM PM 2.5 monitors have been ordered and we anticip ate installing them during July and August 2011.
By January 1, 2012, the VC APCD will discontinue FRM PM 2.5 sampling at Piru and and the primary FRM PM 2.5 at Thousand Oaks

. At Simi Valley we will continue monitoring PM 2.5 with a FRM PM 2.5 sampler on a 1 in 3 schedule. The Simi Valley FRM PM 2.5 will continue to be our National Design Value monitor. The non-FEM PM 2.5 BAM will continue operation at Simi Valley to provide AQI and episode data.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 18 MONITORING DIVISION Beginning on January 1, 2012 the VCAPCD w ill initiate a year long comparative study establishing the relationshi p between our curre nt manual FRM PM 2.5 samplers and the new automated continuous FEM PM 2.5 BAM monitors at a near coastal station, El Rio, and at an in land valley station, Thousand Oaks. We will continue operating the FRM PM 2.5 samplers on their current schedules through the end of 2011 to provide for annual data completeness
The tables below are a summary of changes to our PM 2.5 monitoring network for CY2012, the year of the comparison study and fo r the final pending PM 2.5 monitoring network as it will be configured in CY-2013.

Table 12 – CY-2012 PM 2.5 Comparison Study

Station FRM PM 2.5 FRM PM 2.5 Collocated Non-FEM PM 2.5 FEM PM 2.5 El Rio 1 in 6* Discontinued Initiated/Primary* Ojai Valley Initiated/Primary Piru Discontinued Discontinued Initiated/Primary Thousand Oaks Discontinued 1 in 6* Discont inued Initiated/Primary*

Simi Valley Primary/1 in 3/DV Continued/AQIEpisode *Monitors in Comparison Study Sampling Schedule Changes from CY-2011

• El Rio FRM 2.5 changed from 1 in 3 to 1 in 6
Table 13 – CY-2013 Pending Final PM 2.5 Network

Station FRM PM 2.5 FRM PM 2.5 Collocated Non-FEM PM 2.5 FEM PM 2.5 El Rio Discontinued Primary Ojai Valley Primary Piru Primary Thousand Oaks 1 in 12* Primary

Simi Valley Primary/1 in 3/DV Continued/AQIEpisode Sampling Schedule Changes from CY-2012

• Thousand Oaks FRM 2.5 Collocated changed from 1-6 to 1-12 3.3 Pending Changes To The PM 10 Monitoring Network
As shown in Section 2.4.3, VCAPCD operates four FRM PM 10 samplers at three air monitoring stations (El Rio, Simi Valley, Ojai). There are two FRM PM 10 samplers at2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 19 MONITORING DIVISION Simi Valley, one is collocated. Two FEM PM 10 BAM monitors will be ordered in July 2011. These monitors will be inst alled at El Rio and Simi Va lley in October 2011. At Ojai, the FRM PM 10 sampler will be discontinued with the installation of the FEM PM 2.5 BAM.
Beginning on January 1, 2012, the VCAPCD w ill initiate a year long comparative study establishing the relationshi p between our curre nt manual FRM PM 10 samplers and the new automated continuous FEM PM 10 BAM monitors at Si mi Valley. We will continue operating the FRM PM 2.5 samplers on their curre nt schedules through the end of 2011 to provide for annual data completeness
The tables below are a summary of changes to our PM 10 monitoring network for CY2012, the year of the comparison studies and for the final pending PM 10 network as it will be configured in CY-2013.

Table 14 – CY-2012 PM 10 Comparison Study

Station FRM PM 10 FRM PM 10 Collocated FEM PM 10 El Rio Discontinued Initiated/Primary Ojai Valley Discontinued Simi Valley Discontinued 1 in 6* Initiated/Primary*/DV * Monitors in Comparison Study Table 15 – CY-2013 Pending Final PM 10 Network

Station FRM PM 10 FRM PM 10 Collocated FEM PM 10 El Rio Primary Simi Valley 1 in 12 Primary/DV Sampling Schedule Changes from CY-2012

• Simi Valley FRM PM 10 Collocated changed from 1 in 6 to 1 in 12

3.4 Pending Changes To The PAMS Network
40CFR58 Appendix D, Section 5 specifie s the network design for the PAMS program. Federal regulation require the addi tion of NOy monitoring at type 3 sites (Simi Valley) and trace CO m onitoring at type 2 sites (El Rio). We have not installed the instrumentation due to wide spread questioning by Fe deral and state air agency staff of the rationale of m onitoring NOy and trace CO in Southern California.. Additionally, any changes to our existing PAMS netwo rk are on hold until EPA updates the requirements for the PAMS program as advis ed by EPA Region 9 in an2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 20 MONITORING DIVISION April 28, 2011 email from Meredith Kurpius, PhD, Air Div ision. As previously stated, the Ventura monitoring stat ion was discontinued on Apr il 28, 2011. The Ventura monitoring station is no t needed for PAMS, only site ty pe 2 and 3 are required. The 2005 ozone season was the last time VOC cani sters were collected at the Ventura monitoring station due to sampler failure . The Ventura moni toring station was a sentinel site, meaning only if ozone was forecast to be above the NAAQS were cannisters collected. El Rio and Simi Valle y collect cannisterss on a 1 in 3 day schedule during July, August, and September, pursuant to the California Alternative Plan III.
Continuous NMHC monitoring is required at site types 2 and 3. Our NMHC analyzers failed last year. We have two NMHC analyzers on order and expect to have them installed and operational in July 2011.
In July 2011 we will be orde ring a gas chromat ograph to provide additional analysis capability for our lab staff to analyze for Volatile Or ganic Compounds (VOC). The new gas chromatograph should be installed in late Fall 2011.
The atmospheric profiler failed in No vember 2010. VCAPCD staff has done extensive research to get t he atmospheric profiler repaired. A major upgrade to the atmospheric profiler equipm ent will be made this summer , and we anticipate the atmospheric profiler to be operational in Fall 2011.
3.5 Pending Changes To The NO 2 Network
In 2010 EPA adopted a new NAAQ S for nitrogen dioxide (NO 2 ). MSA’s with a population greater than 500,000 are required to es tablish an ambient NO 2 near road site by January 1, 2013. As a result, VCAPCD will establish an ambient NO 2 near road monitoring site along US Highway 101 (The Ventura Freeway), in Thousand Oaks between Hampshire Road and Westlake Village Road.

3.6 Status Of SO 2 On June 2, 2010, EPA est ablished a new 1-hour SO 2 NAAQS, effective August 23, 2010, which is based on the 3- year average of the annual 99 th percentile of 1-hour daily maximum averages in ppb (level: 75). MSA’s with a population-weighted emission index (PWEI) greate r than a threshold would be required to establish an ambient SO 2 monitoring program by January 1, 2013. On Ma y 27, 2011 EPA Region 9 issued an email from Meredi th Kurpius, PhD, Air Divisio n, stating that “EPA did not expect Ventura County to have any additional SO 2 monitoring requ irements based on the 2008 NEI”. Therefore, based on the 2008 NEI (Natio nal Emissions Inventory), Ventura County fell below the PWEI threshold releasing the VCAPCD from the need2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 21 MONITORING DIVISION to monitor SO 2
.
3.7 Status Of Lead

In 2008 EPA revised the NAAQ S for lead from 1.5 μg/m 3 to 0.15 μg/m 3 . The regulation requires that state and local agencies establish an ambient lead monitor by January 1, 2011. In De cember 2009 EPA proposed revisi ons to the regulation that revise “source oriented” monitoring requirements. As a result of EPA’s revisions, and EPA’s recent acceptance of the VCAPCD’s lead emission inventory for airports, the VCAPCD will not be subject to the lead monitoring requirements.
3.8 Proposed Changes To The Speciation Trends Network (STN)
As part of the PM 2.5 monitoring network, VCAPCD operat es a speciation monitor at the Simi Valley air monitoring station. Samples collected from the speciation sampler are analyzed by an EPA contractor. Th e SASS samplers (Speciation Air Sampling System and URG carbon sampler), are maintained by VCAPCD for EPA. SASS and URG filters are sent to VCAPCD to be run and t hen returned on a tight schedule to an EPA contractor for analysis. VCAPCD has had difficulty meeting the receiving, run, and pickup schedules set by the EPA. Our discussion of these issues with EPA Region 9 revealed this to be common probl em. EPA Region 9, the EPA’s contractor, and VCAPCD will be refining these sampling procedures and schedules in 2012.
3.9 Pending Changes To The Data Acquisition And Management System
From July to October 2011 we will work on improving our co nnectivity issues between the air monitoring anal yzers and our o ffice. We are acquiring more sophistcated analyzers that can be interrogated remotely to reduce travelling time to the air monitoring stations. We have hired a contractor to establish the greater connectivity capability. Included is an upgrade to our data acquisition and management system.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 22 MONITORING DIVISION 

### 4 Required Quality Assurance Of The Monitoring Program

This section demonstrates co mpliance with the quality assu rance requirements of 40 CFR 58 Appendices A, C, and E. This information is required in annual network plans.
Annually, CARB’s Quality Assurance (Q A) Section conducts quality assurance performance evaluations (audits) for each nitrogen dioxide analyzer, ozone analyzer and particulate sampler in the network with National Institute of Standards and Technology (NIST) traceable gases and calibra tors. The monitors are calibrated on a biannual schedule with separate standard eq uipment. Flow standards are NISTtraceable and recertified annually.
As part of the annual CARB QA Section audit at each air monitoring station, CARB QA Section staff conduct siting eval uations. Physical m easurements and observations, including probe/s ensor height above ground leve l, distance from trees, type of ground cover, residenc e time, obstructions to air flow, and distance to local sources, topography, vehicle counts, predominant wind dire ction, probe material, etc., are taken to determine compliance wit h 40 CFR 58, Appendix E requirements. Quality Assurance Site Info rmation along with phot ographs of the moni toring stations are available on the CARB website at http://www.arb.ca.gov/qaweb/ countyselect.php?c_arb_code=56

. Ozone audits are performed by CARB QA Section staff using dedicated ozone transfer standards (API 400 Series) and biannual calibrations are performed by VCAPCD staff using dedicated ozone trans fer standards (API 400 Series) that are certified quarterly with a l aboratory API 400 E ozone primary standard that is itself certified annually by the CARB with re ferencing to a NI ST-referenced ozone photometer.

FRM PM 2.5 samplers are audited annually by the CARB QA Secton, some are audited by EPA contractor, and all are calib rated biannually by VCAPCD staff. Each program uses separate equipment that includes BGI deltaCal and triCal digital flow2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 23 MONITORING DIVISION calibrators which are certified against NI ST-traceable primary standards. VCAPCD staff also perform monthly flow, pressu re and temperature checks on FRM PM 2.5 samplers using certified/referenced instru ments. (Note: The CSN samplers, SASS and URG are not audited.)

PM 10 sampler flow rate audits are conducted annually by the CARB QA Section and by EPA contractor, while the PM 10 sampler flow rate calib rations are done biannually by VCAPCD staff. Both ar e conducted with dedicated in struments that include BGI Hi-Vol Calibrators that are ce rtified annually to NIST. PM 10 flow rates are checked monthly against a separate standard by VCAPCD staff.

NO 2 audits are performed by CARB QA Section staff using dedicated multi-gas calibrators, and calibrations are perfor med biannually by VCAPCD staff using Environics S-9100 multi-gas calibrators.
Meteorological audits are conducted by CARB QA Section staff wit h instruments that are NIST-traceable and/or manu facturer-certified. Calib rations are performed by VCAPCD staff triannually with NIST-refer enced or NIST-tra ceable standards.
The PAMS-VOC program participated in an EPA Region 9 audit. VCAPCD plans to participate in Region 9’s annual perform ance evaluation. The PAMS-Carbonyls program participates in bi annual Performance Evaluations overseen by the EPA. All of the programs ( PAMS-VOC’s, PAMS-Carbonyls), ar e all calibrated with NISTreferenced standards.
The VCAPCD’s gravimetric laboratory is audited annualy by CARB QA Section staff with NIST-referenced or NIST-traceable st andards. The balanc es are certified annually by a contractor usi ng NIST-referenced or NIST-t raceable standards and the mass standards are certified biannually by a contractor using NIST-referenced or NIST-traceable standards.
Approximately every five years, the EPA conducts a Technical Systems Audit (TSA) of the VCAPCD’s air quality monitoring network and procedur es (the last TSA was in May of 2004). The audits examine all aspects of the VCAPCD’s gravimetric laboratory and field monito ring and data processing operat ions. The TSA is to determine if VCAPCD’s air moni toring program satisfies the requirements of 40 CFR 58 and EPA's Quality Assurance Handbook for Air Pollution Measurement Systems, Volume II. Compliance with thes e regulations is necessary for data to be considered data-for-record per the California Code of R egulations (Title 17, Article 3, section 70301). Data meeting these r equirements are eligible to be submitted to EPA’s AQS database and be used for regul atory actions taken pursuant to the Federal Clean Air Act and the California Clean Air Act.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 24 MONITORING DIVISION 

### 5 Data Submission Requirements 5.1 Air Quality Data
VCAPCD’s air monitoring stations report da ta to the EPA’s AQS database. The data generated at these stations are public informati on and are available in various formats from the respective agencies. Table 16 lists so me sources for air quality data.
Table 16 - Sources Of Ambient Air Quality Data

Agency Address For Data Requests Internet Address Data Available

Ventura County APCD 669 County Square Drive Ventura, CA 93003 http://www.vcapcd.org/ Ventura County

California Air Resource Board PO Box 2815 Sacramento, CA 95812 http://www.arb.ca .gov/html/ds.htm California Air Monitoring Data

United States Environmental Protection Agency Ariel Rios Building 1200 Pennsylvia Avenue, N.W. Washington, DC 20460 http://www.epa.gov/air/data/ National Air Monitoring Data

Real time air quality and meteorological dat a is available on CARB’s Air Quality and Meteorological Information System at http://www.arb.ca.gov/aqmis2/aqmis2.php

. Federal regulations require that air moni toring organizations su bmit precision and2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD 25 MONITORING DIVISION accuracy data for the data reported to AQS. VCAPCD air monitoring precision data are submitted to the EPA AQS database on a quarterly basis and are up to date as of the publication of this r eport. Accuracy data are r eported to the EPA by CARB.
Federal regulations require the air monito ring organizations to annually submit a letter certifying that ambient data and quality assurance data are completely submitted to AQS and that the ambient data are accu rate to the best of our knowledge taking into consideration the quality assurance findings. VCAPCD’s 2010 annual data certification was su bmitted to EPA on 4/27/2011.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD MONITORING DIVISION 

# Appendix A Detailed Station Information2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-1 MONITORING DIVISION 

## Detailed Station Information El Rio – Rio Mesa School #2

The El Rio air monitoring station is locat ed 7 miles inland in the broad Oxnard Plain area, covering 286 square miles and hom e to 198,970 people– approximately 24.2 percent of Ventura County’s population. In 2010 the VCAP CD operated samplers to collect ambient data for ozone, PM 10 , PM 2.5 , continuous PM 2.5 , nitrogen dioxide, NMHC, VOC (canisters), and ca rbonyls. The VCAPCD also collects meteorological measurements at the station (wind speed, wind direct ion, temperature, relative humidity, solar radiati on, and precipitation).

The VCAPCD has conducted oxidant and ozone sampling in the Ventura/Oxnard Plain area since 1969. The VCAPCD also has monitored for particulate matter in the Ventura/Oxnard Plain area since 1971.

Ozone
Typically, this station reco rds the lowest 1- and 8-hour ozone levels in Ventura County. The station’s annual maximum 1-hour ozone average has been reduced from .190 ppm in 1989 to .083 ppm in 2010. In 2010 the station’s 4 th highest annual maximum 8-hour average was .062 ppm and the annual maximum 8-hour average was .073 ppm.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-2 MONITORING DIVISION Figure 3 - Ozone Trends Summary: El Rio-Rio Mesa School #2

NOTES: 1. Area: Ventura County; South Central Coast Air Basin; Ventura 8-Hour Ozone Planning Area 2. District: Ventura County APCD 3. Years: Ozone data are available on CARB’s AQ Stat istics database for this station from 1980 through 2009. 4. All concentrations express ed in parts per million. 5. An exceedance is not necessarily a violation. 6. The national 1-hour ozone NAAQS was revo ked in June 2005 and is no longer in effect.

PM 2.5

This station has not exceeded the 24- hour NAAQS or the annual NAAQS for PM 2.5
. In 2010 the station’s annual 98th percent ile maximum 24-hour average was 16.5 μg/m 3 and the annual weighted mean was 8.5 μg/m 3

.
Table 17 – El Rio PM 2.5 Annual Maximum Averages
Annual 98th Percentile 24-Hour Averages Annual Weighted Means 2007 2008 2009 2010 2007 2008 2009 2010 27.5 19.7 18.9 16.5 10.6 10.1 10.2 8.5

PM 10

In 2007 this station exceeded the 24-hour PM 10 NAAQS with a average of 248 μg/m 3

.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-3 MONITORING DIVISION This average occurred during a major wild fire in Ventura County and has been flagged as an exceptional event. The VCAP CD has submitted this information to U.S. EPA, through CARB, to have this av erage excluded. In 2010 the station’s annual maximum 24-hour average was 62 μg/m 3 . Note that in December 2006 EPA revoked the PM10 annual NAAQS.

Table 18 – El Rio PM 10 Annual Maximum 24-Hour Averages
Annual Maximum 24-Hour Averages 2007 2008 2009 2010 248* 80 100 62 *Flagged as an “Exceptional Event”
PAMS
The El Rio monitoring statio n is a Type 2 PAMS site and has operated since 1994. During the period of July 1 through September 30 of each year the VCAPCD operates this station according to est ablished EPA protocols fo r PAMS monitoring and the CAP III protocol. 40CFR58 Appendi x D, Section 5 spec ifies the network design for the PAMS program. Federal regulation require the addition of trace CO monitoring at type 2 sites. We have not installed the instrumentation due to wide spread questioning by Federal and state air agency staff of the rationale of monitoring trace CO in Sout hern California.. Additionally, any changes to our existing PAMS network are on hold until EPA updat es the requirements for the PAMS program

.
Table 19 – El Rio Station Information

Station Name > El Rio – Rio Mesa School #2 AQS ID 061113001 Grid Coordinates Latitude: 34 o 15’ 8” Longitude:119 o 8’ 35” Location On school grounds Address 545 Central Ave, Oxnard CA 93036 County Ventura County Location Type Suburban Dist. to road 75 meters Traffic count 5,000 vehicles/day Groundcover Paved/asphalt PEP audit September 2010 (EPA Contractor) Flow audit April 2011 (CARB) Representative Area Oxnard Coastal Plain2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-4 MONITORING DIVISION Table 20 – El Rio Monitor Information

Pollutant > Ozone Non-FEM BAMPM 2.5 PM 10 -SSI Monitor Designation PAMS/ SLAMS N/A SLAMS Monitor objective Population exposure N/A Population exposure Spatial scale Urban Scale Neighborhood Urban Scale Sampling method API/Teledyne 400 Met One 1020 BAM Anderson SA1200 Analysis method Ultraviolet Absorption Beta Attenuation Size selective inlet Start date 01/01/1979 01/01/2005 04/03/1988 Operation schedule Continuous Continuous 1-in-6 days Sampling season Year-round Year-round Year-round Probe height 4.3 meters 4. 7 meters 5.5 meters Distance from supporting structure 1.2 meters 1.7 me ters 1.9 meters
Distance from obstructions on roof None None None
Distance from obstructions not on roof None None None
Distance from trees 15 mete rs 15 meters 15 meters Distance between collocated monitors N/A N/A N/A
Unrestricted airflow 360 degrees 360 degrees 360 degrees

Probe material Borosilicate glass & FEP Teflon N/A N/A
Residence time 7.5 seconds N/A N/A Will there be changes within the next 18 months? No Yes 5 No
Is it suitable for comparison against the annual PM 2.5 ? N/A No N/A

5 See Section 3.22011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-5 MONITORING DIVISION Pollutant > FRM PM 2.5 Nitrogen Dioxide VOCs Monitor Designation SLAMS PAMS/SLAMS Type 2 PAMS/SLAMS

Monitor objective Population exposure Population exposure High concentration Spatial scale Neighborhood Urban Scale

Sampling method Partisol-Plus Model 2025 Sequential Air Samplers API 200A Xontech 910PC Integrated grab sampling

Analysis method Size selective inlet Chemiluminescent Laboratory gas chromatography Start date 01/01/1999 01/01/1980 1994

Operation schedule 1-in-3 days Continuous 1-in-3 days and days in which ozone is predicted to exceed 0.075 ppm Sampling

season Year-round Year-round July 1 through September 30 Probe height 5.5 meters 4. 3 meters 4.3 meters Distance from supporting structure 1.9 meters 1.2 me ters 1.2 meters

Distance from obstructions on roof None None None

Distance from obstructions not on roof None None None

Distance from trees Distance between collocated monitors N/A N/A N/A

Unrestricted airflow 360 degrees 360 degrees 360 degrees

Probe material N/A Borosilicate glass & FEP Teflon Borosilicate glass & FEP Teflon2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-6 MONITORING DIVISION Pollutant > FRM PM 2.5 Nitrogen Dioxide VOCs Residence time N/A 8.8 seconds Will there be changes within the next 18 months? Yes 6 No No

Is it suitable for comparison against the annual PM 2.5 ? Yes N/A N/A

Figure 4 – Map Showing Location Of El Rio – Rio Mesa School #2

6 See Section 3.22011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-7 MONITORING DIVISION 

## Detailed Station Information Ojai – Ojai Avenue

The Ojai air monitoring statio n is located 14 miles from the coast in the Ojai Valley area, which covers 102 square miles and is home to 27,784 peop le – approximately 3.4 percent of Ventura C ounty’s population. The VC APCD currently operates samplers to collect am bient ozone, continuous PM 2.5 and PM 10 data. The VCAPCD also collects meteorological measurements (wind speed, wind direct ion, temperature, relative humidity, solar radiation, and precipitation) at the station.
The VCAPCD has operated oxidant and ozon e monitors in the Ojai Valley since 1970. (Oxidant sampling was al so conducted in the Ojai Va lley for a one year period during the mid-1960s.) The VCAPCD also has monitored for particulate matter in the Ojai Valley since 1973.

Ozone

This station records some of the hi ghest 1-hour and 8-hour ozone averages in Ventura County. The station’s annual maximum 1-hour ozone average has been reduced from .135 ppm in 1996 to .099 ppm in 2010. In 2010 the station’s 4 th highest annual maximum 8-hour average was .077 ppm and the maximum 8-hour ozone average was .084 ppm. During 2010, ozone averages at t he Ojai monitoring station exceeded the level of the 8-hour ozone NAAQS on 7 days.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-8 MONITORING DIVISION Figure 5 - Ozone Trends Summary: Ojai - Ojai Avenue

NOTES: 1. Area: Ventura County; South Central Coast Air Basin; Ventura 8-Hour Ozone Planning Area 2. District: Ventura County APCD 3. Years: Ozone data are available in CARB’s AQ Stat iatics database for this station from 1996 through 2009. 4. All concentrations express ed in parts per million. 5. An exceedance is not necessarily a violation. 6. The 1-hour ozone NAAQS was revoked in June 2005 and is no longer in effect

PM 10

This station has not exceeded the 24-hour PM 10 NAAQS. In 2010 the station’s annual maximum 24-hour average was 45 μg/m 3 . Note that in December 2006 EPA revoked the PM 10 annual NAAQS.
Table 21 – Ojai PM 10 Maximum 24-Hour Averages
Annual Maximum 24-Hour Averages 2007 2008 2009 2010

99* 61 38 45 *Flagged as an “Exceptional Event”2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-9 MONITORING DIVISION Table 22 – Ojai Station Information

Station Name > Ojai - Ojai Avenue AQS ID 061111004 Grid Coordinates Latitude: 34 o 26’ 53” Longitude: 119 o 13’ 53” Location At Ventura C ounty Fire Station 21 Address 1201 Ojai Ave., Ojai CA 93023 County Ventura County Location Type Suburban Dist. to road 250 meters Traffic count 10,000 vehicles/day Groundcover Paved PEP audit September 2010 (EPA Contractor) Flow audit April 2011 (CARB) Representative Area Ojai Valley

Table 23 – Ojai M onitor Information

Pollutant > Ozone Non-FEM BAM PM 2.5 PM 10 -SSI Monitor designation SLAMS N/A SLAMS Monitor objective Population exposure N/A Population exposure Spatial scale Urban Neighborhood Urban Sampling method API Teledyne 400 Met One 1020 BAM Anderson SA1200 Analysis method Ultraviolet absorption Beta Attenuation Size Selective Inlet Start date 04/01/1996 05/17/2006 04/01/1996 Operation schedule Continuous Continuous 1-in-6 days Sampling season Year-round Year-round Year-round Probe height 4.0 meters 4. 1 meters 4.1 meters Distance from supporting structure 1.0 meters 1.5 me ters 1.5 meters
Distance from obstructions on roof None None None
Distance from obstructions not on roof None None None2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-10 MONITORING DIVISION Pollutant > Ozone Non-FEM BAM PM 2.5 PM 10 -SSI
Distance from trees 10.5 mete rs 10.5 meters 10.5 meters Distance between collocated monitors N/A N/A N/A
Unrestricted airflow 360 degrees 360 degrees 360 degrees

Probe material Borosilicate glass & FEP Teflon N/A N/A
Residence time 7.8 seconds N/A N/A Will there be changes within the next 18 months? No Yes 7 Yes 8
Is it suitable for comparison against the annual PM 2.5 ? N/A No N/A

Figure 6 – Map Showing Locatio n Of Ojai – Ojai Avenue

7 See Section 3.2 8 See Section 3.32011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-11 MONITORING DIVISION 

## Detailed Station Information Piru – Pacific Avenue

The Piru – Pacific Avenue air monitoring statio n is located 28 miles from the coast in the Santa Clara River Valley, covering 204 sq uare miles and home to 45,107 people – approximately 5.5 percent of Ventura County’s populati on. The VCAPCD currently operates samplers to colle ct ozone and continuous PM 2.5 data. The VCAPCD also collects meteorological measur ements at the station ( wind speed, wind direction, temperature, relative humidity, so lar radiation, and precipitation).

The VCAPCD has conducted oxidant and oz one sampling in the Santa Clara River Valley since 1972. The VCAPCD also has mo nitored for particul ate matter in the Santa Clara River Valley since 1973, wit h limited sampling for a one year period during the mid-1960s.

Ozone

The station’s annual maximum 1-hour ozone average has been reduced from .123 ppm in 2002 to .087 ppm in 2010. In 2010 the station’s 4 th highest maximum 8-hour average was .073 ppm and th e maximum 8-hour ozone average was .082 ppm. During 2010, ozone averages at the Piru monitoring station exceeded the level of the 8-hour ozone NAAQS on 1 day2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-12 MONITORING DIVISION Figure 7 - Ozone Trends Summary: Piru – Pacific Avenue

NOTES: 1. Area: Ventura County; South Central Coast Air Basin; Ventura 8-Hour Ozone Planning Area 2. District: Ventura County APCD 3. Years: Ozone data are available in CARB’s AQ Stat iatics database for this station from 2000 through 2009. 4. All concentrations express ed in parts per million. 5. An exceedance is not necessarily a violation. 6. The 1-hour ozone NAAQS was revoked in June 2005 and is no longer in effect

PM 2.5

This station has not exceeded the 24- hour NAAQS or the annual NAAQS for PM 2.5
. In 2010 the station’s annual 98 th percentile 24-hour average was 16.3 μg/m 3 and the annual weighted m ean was 8.5 μg/m 3

.
Table 24 – Piru – Pacific Avenue PM 2.5 Maximum Averages
Annual 98th Percentile 24-Hour Averages Annual Weighted Means 2007 2008 2009 2010 2007 2008 2009 2010 22.3 17.0 18.8 16.3 10.2 9.8 9.5 8.5

PM 10 Monitoring for PM 10 at this station was discontinued in July 2004.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-13 MONITORING DIVISION Table 25 – Piru Station Information

Station Name > Piru – Pacific Avenue AQS ID 061110009 Grid Coordinates Latitude: 34 o 24’ 16” Longitude: 118 o 48’ 36” Location On a ranch Address 3301 Pacific Ave., Piru CA 93040 County Ventura County Location Type Rural Dist. to road 500 meters Traffic count 22,000 vehicles/day Groundcover Gravel PEP audit September 2010 (EPA Contractor) Flow audit April 2011 (CARB) Representative Area Sant a Clara River Valley

Table 26 – Piru Monitor Information

Pollutant > Ozone Non-FEM BAM PM 2.5 FRM PM 2.5 Monitor designation SLAMS SLAMS Monitor objective High concentration N/A Population exposure Spatial scale Urban scale N/A Neighborhood

Sampling method API Teledyne 400 Met One 1020 BAM Partisol-Plus Model 2025 Sequential Air Samplers Analysis method Ultraviolet absorption Beta Attenuation Size Selective Inlet
Start date 11/03/2000 05/26/2006 11/01/2000 Operation schedule Continuous Continuous 1-in-6 days Sampling season Year-round Year-round Year-round Probe height 3.8 meters 4. 0 meters 4.0 meters Distance from supporting structure 1.4 meters 1.5 me ters 1.5 meters
Distance from obstructions on roof None None None2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-14 MONITORING DIVISION Pollutant > Ozone Non-FEM BAM PM 2.5 FRM PM 2.5 Distance from obstructions not on roof None None None

Distance from trees 28 mete rs 28 meters 28 meters Distance between collocated monitors N/A N/A N/A Unrestricted airflow 360 degrees 360 degrees 360 degrees

Probe material Borosilicate glass & FEP Teflon N/A N/A
Residence time 9.9 seconds N/A N/A Will there be changes within the next 18 months? No Yes 9 Yes 10

Is it suitable for comparison against the annual PM 2.5 ? N/A No Yes

9 See Section 3.2 10 See Section 3.22011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-15 MONITORING DIVISION Figure 8 – Map Showing Locatio n Of Piru – Pacific Avenue2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-16 MONITORING DIVISION 

## Detailed Station Information Simi Valley – Cochran Street

The Simi Valley air monitoring station is lo cated 34 miles from the coast in the Simi Valley area, which covers 142 square miles and is home to 162,683 people – approximately 19.8 percent of Ventura County’s population. The station covers the cities of Simi Valley and Moorpark. T he VCAPCD currently operates samplers to collect ambient data for ozone, PM 10 , PM 2.5 , continuous PM 2.5 , speciated PM 2.5 , nitrogen dioxide, NMHC, VOC (c anisters), and air toxics.
In addition to sampling for gaseous and par ticulate air pollutants, the VCAPCD collects meteorological meas urements (wind speed, wind direction, temperature, relative humidity, solar radiation, and visib ility) at the station. At the Simi Valley Upper Air Station, seven m iles to the west, the VCAP CD operates an atmospheric profiler, which collects wind and temperature data from 60 meters to 2,000 meters above the surface. At the su rface, we collect additional meteorological data (wind speed, wind direction, te mperature, relative humidity, so lar radiation, precipitation, ultraviolet radiation, an d atmospheric pressure).
The VCAPCD has continuously operated ozon e monitors at the same location in Simi Valley since 1973. The VCAPCD also has monitored for particulate matter at the same location since 1973, and has oper ated a Type 3 PAMS (Photochemical Assessment Monitoring Station) station since 1995. In addition, the station is designated a national fine particle speciation trends network site.

Ozone
This station typically records the highes t 1- and 8-hour ozone levels in Ventura County. The Simi Valley air monitori ng station’s annual maximum 1-hour ozone average has been reduced from .20 ppm in 1989 to .098 ppm in 2010. In 2010 the station’s 4 th highest annual maximum 8-hour average was .082 ppm and the station’s annual maximum 8-hour ozone average was .0 87 ppm . The station’s 2010 8-hour ozone annual design value of . 086 ppm is the highest ozone annual design value of all monitoring stations in Ventura County. During 2010, ozone averages at the Simi Valley monitoring station exceeded the level of the 8-hour ozone NAAQS on 8 days.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-17 MONITORING DIVISION Figure 9 - Ozone Trends Summary: Simi Valley-Cochran Street

NOTES: 1. Area: Ventura County; South Central Coast Air Basin; Ventura 8-Hour Ozone Planning Area 2. District: Ventura County APCD 3. Years: Ozone data are available in CARB’s AQ Stat iatics database for this station from 1985 through 2009. 4. All concentrations express ed in parts per million. 5. An exceedance is not necessarily a violation. 6. The 1-hour ozone NAAQS was revoked in June 2005 and is no longer in effect.

PM 2.5

This station has not exceeded the 24- hour NAAQS or the annual NAAQS for PM 2.5
. In 2010 the station’s annual 98 th percentile 24-hour average was 17.4 μg/m 3 and the annual weighted m ean was 8.7 μg/m 3

. Table 27 – Simi Valley PM 2.5 Maximum Averages
Annual 98th Percentile 24-Hour Averages Annual Weighted Mean 2007 2008 2009 2010 2007 2008 2009 2010 31.8 25.7 20.5 17.4 11.7 10.7 10.3 8.7

PM 10

This station has not exceeded the 24-hour PM 10 NAAQS. The Simi Valley2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-18 MONITORING DIVISION monitoring station has two FRM samplers for PM 10 . In 2010 the station’s annual maximum 24-hour average was 34 μg/m 3

. Table 28 – Simi Valley PM 10 Annual Maximum 24-Hour Averages
Annual Maximum 24-Hour Average 2007 2008 2009 2010

117 80 77 34

PAMS
The Simi Valley monitoring station is a Ty pe 3 PAMS site and has operated as such since 1994. During the period of July 1 through September 30 of each year the VCAPCD operates this site accordi ng to established EPA protocols for PAMS monitoring and the CAP III protocol.
40CFR58 Appendix D, Section 5 specifie s the network design for the PAMS program. Federal regulation require the additi on of NOy monitoring at type 3 sites. We have not installed the instrumentation due to wide spread questioning by Federal and state air agency staff of the rationale of monitoring NOy in Southern California.. Additionally, any changes to our existing PAMS netwo rk are on hold until EPA updates the requirement s for the PAMS program

. Table 29 – Simi Valley Station Information

Station Name > Simi Valley – Cochran Street AQS ID 061112002 Grid Coordinates Latitude: 34 o 16’ 34” Longitude: 118 o 41’ 1” Location On school grounds Address 5400 Cochran St., Simi Valley CA 93063 County Ventura County Location Type Suburban Dist. to road 140 meters Traffic count 10,000 vehicles/day Groundcover Asphalt PEP audit September 2010 (EPA Contractor) Flow audit April 2011 (CARB) Representative Area Simi Valley2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-19 MONITORING DIVISION Table 30 – Simi Valley Monitor Information

Pollutant > Ozone Nitrogen Dioxide PM 10 -SSI (Primary) Monitor designation PAMS/ SLAMS PAMS/SLAMS SLAMS Monitor objective High concentrations High concentrations High concentrations Spatial scale Urban Urban Neighborhood Sampling method API Teledyne 400 API 200A Tisch PM 10 Analysis method Ultraviolet Absorption Chemiluminescent Size Selective Inlet Start date 06/01/1985 06/01/1985 11/04/1986 Operation schedule Continuous Continuous 1-in-6 days Sampling season Year-round Year-round Year-round Probe height 3.9 meters 3. 9 meters 4.8 meters Distance from supporting structure 1.3 meters 1.3 me ters 1.5 meters
Distance from obstructions on roof None None None
Distance from obstructions not on roof None None None

Distance from trees 61 mete rs 61 meters 73 meters Distance between collocated monitors N/A N/A 3.5 meters
Unrestricted airflow 360 degrees 360 degrees 360 degrees

Probe material Borosilicate glass & FEP Teflon Borosilicate glass & FEP Teflon N/A
Residence time 7.9 seconds 8.3 seconds N/A Will there be changes within the next 18 months? No No Yes 11

Is it suitable for comparison against the annual PM 2.5 ? N/A N/A N/A

11 See Section 3.22011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-20 MONITORING DIVISION Pollutant > PM 10 -SSI (Collocated) FRM PM 2.5 Non-FEM BAM PM 2.5 Monitor designation SLAMS SLAMS Monitor objective High concentrations Population exposure N/A Spatial scale Neighborhood Neighborhood N/A

Sampling method Tisch PM 10 Partisol-Plus Model 2025 Sequential Air Samplers Met One 1020 BAM

Analysis method Size Selective Inlet Size Selective Inlet Beta Attenuation Start date 11/04/1986 01/01/1999 01/01/2004 Operation schedule 1-in-6 da ys 1-in-3 days Continuous Sampling season Year-round Year-round Year-round Probe height 4.8 meters 4. 7 meters 4.7 meters Distance from supporting structure 1.5 meters 1.4 me ters 1.4 meters
Distance from obstructions on roof None None None
Distance from obstructions not on roof None None None

Distance from trees 73 mete rs 73 meters 61 meters Distance between collocated monitors 3.5 meters N/A N/A
Unrestricted airflow 360 degrees 360 degrees 360 degrees Probe material N/A N/A N/A Residence time N/A N/A N/A Will there be changes within the next 18 months? Yes 12 No No

Is it suitable for comparison against the annual PM 2.5 ? N/A Yes No

12 See Section 3.32011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-21 MONITORING DIVISION Pollutant > PM 2.5 Speciation VOCs Monitor designation Speciation Trends Speciation Trends Type 3 PAMS

Monitor objective PM 2.5 Speciation PM 2.5 Speciation High concentration Spatial scale

Sampling method Met One Super SASS URG 3000N (carbon channel only) Xontech 910PC Integrated grab sampling

Analysis method Laboratory gas chromatography Start date April 1, 2009

Operation schedule 1-in-3 days 1-in-3 days 1-in-3 days and days in which ozone is predicted to exceed .075 ppm Sampling season Year-round Year-round July 1 through September 30 Probe height 4.7 meters 4. 7 meters 5.0 meters Distance from supporting structure 1.4 meters 1.4 meters 1.5 meters
Distance from obstructions on roof None None None
Distance from obstructions not on roof None None None

Distance from trees 73 meters 73 meters Distance between collocated monitors N/A N/A N/A
Unrestricted airflow 360 degrees 360 degrees 360 degrees
Probe material N/A N/A Borosilicate glass & FEP Teflon Residence time N/A N/A Will there be changes within the next 18 months? No No No

Is it suitable for comparison against the annual PM 2.5 ? No No N/A2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-22 MONITORING DIVISION Figure 10 – Map Showing Location Of Simi Valley – Cochran Street2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-23 MONITORING DIVISION 

## Detailed Station Information Thousand Oaks – Moorpark Road

This station is located 21 miles inland in the Conejo Valley, covering 75 square miles and home to 150,025 people – approximately 17.5 percent of Ventura County’s population. The VCAPCD currently operates samplers to collect ambient ozone and continuous PM 2.5 data. The VCAPCD also collects meteorological m easurements at the station (wind speed, wind dire ction, temperature, relative humidity, solar radiation, and precipitation).
The VCAPCD has conducted ozone sampling in the Conejo Valley since 1973. The VCAPCD also has monitored for particulat e matter in the Conej o Valley since 1979, with limited sampling prior to that.

Ozone
The Thousand Oaks monitoring stati on’s annual maximum 1-hour ozone average has been reduced from .148 ppm in 1995 to .104 ppm in 2010. In 2010 the station’s 4 th highest annual maximum 8-hour average wa s .076 ppm and the annual maximum 8-hour ozone average was .091 ppm. During 2010, ozone averages at the Thousand Oaks monitoring station exceeded the level of the 8-ho ur NAAQS on six days.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-24 MONITORING DIVISION Figure 11 - Ozone Trends Summary: Thousand Oaks-Moorpark Road

NOTES: 1. Area: Ventura County; South Central Coast Air Basin; Ventura 8-Hour Ozone Planning Area 2. District: Ventura County APCD 3. Years: Ozone data are available in CARB’s AQ Stat iatics database for this station from 1992 through 2009. 4. All concentrations express ed in parts per million. 5. An exceedance is not necessarily a violation. 6. The 1-hour ozone NAAQS was revoked in June 2005 and is no longer in effect.

PM 2.5

This station has not exceeded the 24- hour NAAQS or the annual NAAQS for PM 2.5
. The Thousand Oaks monitoring station has two federal referenc e monitors for PM 2.5
. In 2010 the station’s 98 th percentile annual maximum 24-hour average was 21.3 μg/m 3 and the annual weighted mean was 8.7 μg/m 3

.
Table 31 – Thousand Oaks PM 2.5 Maximum Averages
Annual 98th Percentile 24-Hour Averages Annual Weighted Means 2007 2008 2009 2010 2007 2008 2009 2010 24.9 20.7 21.1 21.3 10.5 10.3 10.7 8.72011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-25 MONITORING DIVISION PM 10 Monitoring for PM 10 at this station was discontinued in July 2004.

Table 32 – Thousand Oaks Station Information

Station Name > Thousand Oaks – Moorpark Road AQS ID 061110007 Grid Coordinates Latitude: 34 o 12’ 37” Longitude: 118 o 52’ 14” Location On school grounds Address 2323 Moorpark Rd., Thousand Oaks CA 91360 County Ventura County Location Type Suburban Dist. to road 175 meters Traffic count 7,000 vehicles/day Groundcover Asphalt PEP audit September 2010 (EPA Contractor) Flow audit April 2011 (CARB) Representative Area Conejo Valley

Table 33 – Thousand Oaks Monitor Information

Pollutant > Ozone Non-FEM BAM PM 2.5 FRM PM 2.5 (Primary) Monitor designation SLAMS SLAMS Monitor objective Population exposure N/A Population exposure Spatial scale Urban N/A Neighborhood

Sampling method API Teledyne 400 Met One 1020 BAM Partisol-Plus Model 2025 Sequential Air Samplers Analysis method Ultraviolet Absorption Beta Attenuation Size Selective Inlet Start date 03/01/1992 May 2007 01/01/1999 Operation schedule Continuous Continuous 1-in-6 days Sampling season Year-round Year-round Year-round Probe height 5.0 meters 3. 0 meters 5.0 meters Distance from supporting structure 1.5 meters 1.0 meters 1.5 meters2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-26 MONITORING DIVISION Pollutant > Ozone Non-FEM BAM PM 2.5 FRM PM 2.5 (Primary)
Distance from obstructions on roof None None None
Distance from obstructions not on roof None None None

Distance from tr ees N/A N/A N/A Distance between collocated monitors N/A N/A 2.0 meters
Unrestricted airflow 360 degrees 360 degrees 360 degrees

Probe material Borosilicate glass & FEP Teflon N/A N/A

Residence time 13.1 seconds N/A N/A Will there be changes within the next 18 months? No Yes 13 Yes 14

Is it suitable for comparison against the annual PM 2.5 ? N/A No Yes

Pollutant > FRM PM 2.5 (Collocated) Monitor designation SLAMS Monitor objective Population exposure Spatial scale Neighborhood Sampling method Partisol-Plus Model 2025 Sequential Air Samplers Analysis method Size Selective Inlet Start date 01/01/1999 Operation schedule 1-in-6 days Sampling season Year-round Probe height 5.0 meters Distance from supporting structure 1.5 meters Distance from obstruc tions on roof None Distance from obstructi ons not on roof None Distance from trees N/A

13 See Section 3.3 14 See Section 3.32011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-27 MONITORING DIVISION Pollutant > FRM PM 2.5 (Collocated) Distance between collocated monitors 2.0 meters Unrestricted airflow 360 degrees Probe material N/A Residence time N/A Will there be changes within the next 18 months? No Is it suitable for comparison against the annual PM 2.5 ? Yes

Figure 12 – Map Showing Location Of Thousand Oaks – Moorpark Road2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-28 MONITORING DIVISION 

## Detailed Station Information Ventura - Emma Wood State Beach

Due to the ongoing costs of oper ating the Ventura station and due to siting issues the Ventura station discontinued monitoring on April 28, 2011
The Ventura monitoring station was loca ted along the coast at Emma Wood State Beach, and represented a c oastal area covering 119 s quare miles and home to 234,275 people – approximately 28 percent of Ventura County’s population. The VCAPCD operated samplers to collect ambient data fo r ozone, and VOC (canisters). The VCAPCD also collected meteorologica l measurements ( wind speed, wind direction, temperature, relative humidity, and solar radiation).

The VCAPCD has conducted oxidant and oz one sampling in the coastal area since 1972 at locations ranging from Point Mugu to La Conchita. Most of the monitoring, however, has occurred at stations in the V entura area. In addition, limited sampling for oxidants was conducted in the area during the mid- and late-1960s and early 1970s. The VCAPCD has conducted ozone sa mpling at the Ventura - Emma Wood station since 1984. This station has also operated as a Type 1 PAMS site since 1996.

Ozone
Typically, Ventura - Emma Wood monitoring station recorded the lowest to second lowest 1-hour and 8-hour ozone averages in Ventur a County. The station’s maximum 1-hour ozone average has been redu ced from .23 ppm in 1989 to .098 ppm in 2010, the station’s 4 th highest annual maximum 8- hour average was .060 ppm and the maximum 8-hour oz one average was .069 ppm. The Ventura - Emma Wood monitoring station did not exceed the level of the 8-hour ozone NAAQS in 2010.2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-29 MONITORING DIVISION Figure 13 - Ozone Trends Summary: Ventura-Emma Wood State Beach

NOTES: 1. Area: Ventura County; South Central Coast Air Basin; Ventura 8-Hour Ozone Planning Area 2. District: Ventura County APCD 3. Years: Ozone data are available CARB’s AQ Stat iatics database for this station from 1984 through 2009. 4. All concentrations expre ssed in parts per million. 5. An exceedance is not necessarily a violation. 6. The 1-hour ozone NAAQS was revoked in June 2005 and is no longer in effect

PAMS
The Ventura - Emma Wood monitoring st ation was a Type 1 PAMS site and was operated as such since 1996. During the period of July 1 through September 30 of each year the VCAPCD operated this site ac cording to established EPA protocols for PAMS monitoring and the CAP II I protocol. See Secti on 3.3 for a discussion of changes to the PAMS monitoring program at this station.

Table 34 – Ventura St ation Information

Station Name > Ventura - Emma Wood State Beach AQS ID 061112003 Grid Coordinates Latitude: 34 o 16’ 50” Longitude: 119 o 18’ 55” Location State Park Address Emma Wood Stat e Beach, Ventura CA2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-30 MONITORING DIVISION Station Name > Ventura - Emma Wood State Beach County Ventura County Location Type Suburban Dist. to road 50 meters Traffic count 175,000 vehicles/day Groundcover Grass and vegetation PEP audit N/A Flow audit N/A Representative Area Ventura Coastal

Table 35 – Ventura Monitor Information

Pollutant > Ozone VOCs Monitor designation PAMS/SLAMS Type 1 PAMS Monitor objective General/Background Spatial scale Neighborhood Sampling method API/Teledyne 400 Xontech 910A/9 12 Integrated grab sampling Analysis method Ultraviolet Absorp tion Laboratory gas chromatography Start date 03/01/1984 1996 15

Operation schedule Continuous 1-in-3 days and days in which ozone is predicted to exceed .075 ppm Sampling season Year-round Ju ly 1 through September 30 Probe height 4.0 meters 4.0 meters Distance from supporting structure 1.0 meters 1.0 meters
Distance from obstructions on roof None None
Distance from obstructions not on roof None None
Distance from trees N/A N/A Distance between collocated monitors N/A N/A Unrestricted airflow 360 degrees 360 degrees

Probe material Borosilicate glass & FEP Teflon Borosilicate glass & FEP Teflon

15 The last samples collected at Ventura-Emma Wood State Beach was in 20052011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-31 MONITORING DIVISION Pollutant > Ozone VOCs Residence time 10.5 seconds Will there be changes within the next 18 months? N/A N/A

Figure 14 – Map Showing Location of Ventura – Emma Wood State Beach2011 AMBIENT AIR MONITORING NETWORK PLAN

VENTURA COUNTY APCD A-32 MONITORING DIVISION 

## Detailed Station Information Simi Valley – Upper Air

Table 36 – Simi Valley – Upper Air Station Information

Station Name > Simi Valley – Upper Air AQS ID 061110008 Grid Coordinates Latitude: 34o 17’ 28” Longitude: 118o 47’ 51” Location At Simi Valley Landfill Address 2801 Madera Rd., Simi Valley CA 93063 County Ventura County

Figure 15 – Map Showing Location Of Simi Valley – Upper Air