# 2015 Ambient Air Monitoring Network Plan

Planning, Monitoring and Outreach Division

May 2015 Public Review Draft2 

## Table of Contents

Introduction .................................................................................................................. ...................................... 4

General Information on Ai r Monitoring Networks ................................................................................ ........ 5
SLAMS Air Monitoring in San Luis Obis po County ................................................................................ ......... 7
Changes to Monitoring Networ k since the Pr evious ANP ......................................................................... 8

Opened, Closed, and Re located Stations ........................................................................................ ........ 8
Ozone Monitoring Network Ch anges ..............................................................................................

...... 10
Particulate Monitoring Network Changes ........................................................................................

..... 10
Nitrogen Dioxide Monito ring Networ k Chan ges .................................................................................. 10

Sulfur Dioxide Monitori ng Network Changes .....................................................................................

.. 10
Other Changes .................................................................................................................

......................... 10

Detailed Network Descriptions .................................................................................................

.................. 11

Ozone Monitori ng Netw ork ......................................................................................................

............... 11
Nitrogen Dioxide Mo nitoring Network ...........................................................................................

....... 13

Sulfur Dioxide Moni toring Network .............................................................................................

.......... 13

Particulate Monito ring Network ................................................................................................

............. 14

Other Ne tworks.................................................................................................................

........................ 15
Proposed Network Change s and Improv ements ..................................................................................... 16

New Stations and Station Cl osures and Re locations ........................................................................... 16

Ozone Monitori ng Netw ork ......................................................................................................

............... 16
Nitrogen Diox ide Netw ork ......................................................................................................

................. 16

Sulfur Dioxide Moni toring Network .............................................................................................

.......... 16

Particulate Monito ring Network ................................................................................................

............. 16
Other Changes and Improvements: ...............................................................................................

........ 16
Non-SLAMS Air Monitoring in San Luis Ob ispo County ............................................................................

.. 17

Oceano Dunes Monitoring .......................................................................................................

................... 17
Price Canyon Monitoring .......................................................................................................

...................... 17

Air Qualit y Data...............................................................................................................

.................................. 18
Appendix A: Minimum Moni toring Requ irements ...................................................................................

.... 19
Minimum Monitoring Requirements for Ozone (O 3 ) ............................................................................... 19
Minimum Monitoring Requirements for PM 2.5 SLAMs............................................................................. 203 Minimum Monitoring Requir ements for Continuous PM 2.5 Monitors ................................................... 20
Minimum Monitoring Requirements for PM 10 ......................................................................................... 21
Minimum Monitoring Requirements for Nitrogen Dioxide (NO 2 ) .......................................................... 21
Minimum Monitoring Requirements for Sulfur Dioxide (SO 2 ) ............................................................... 22
Minimum Monitoring Requirements for Carbon Mo noxide (CO) .......................................................... 22
Minimum Monitoring Requirements for Lead (Pb) at NCore ................................................................. 23

Source-Oriented Lead Monito ring (Including Airports) ..........................................................................

. 23
Appendix B: Colloca tion Requirements...........................................................................................

.............. 24
Appendix C: Detailed Site Information .........................................................................................

................. 25
Appendix D: EPA Approval Atascadero Si te Move .................................................................................

...... 46
Appendix E: Parallel Moni toring in Atascadero .................................................................................

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

Introduction

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

Methods .......................................................................................................................

.................................. 49
Analysis ......................................................................................................................

.................................... 50
Timing of Paralle l Monitoring .................................................................................................

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

PM 2.5 Analysis .....................................................................................................................

....................... 52

Ozone Anal ysis ................................................................................................................

.......................... 54

Conclusion ....................................................................................................................

................................. 54
Appendix F: Index to Items in A nnual Monitoring Pl an Checklist .............................................................. 574 

### Introduction Every year the San Luis Obispo County Air Pollution Control District (SLOCAPCD) submits an ambient air monitoring network plan (ANP) to the United St ates Environmental Protection Agency (EPA); this document comprises the ANP for 2015. It is intended to fulfill federal requirements laid out in 40 CFR 58.10 and to provide additional information ab out local monitoring activities to the public. Consistent with these goals and re quirements, this ANP will be made available for public review for at least 30 days prior to its submission the EPA. All comments received and any SLOCAPCD responses to those comments will be submitted to EPA along with the ANP.

The ANP is a snapshot of the air monitoring ne twork as it currently exists and documents any changes since the last ANP (published May 2014) an d any anticipated changes to the network over
the next 18 months. This review and planning process helps ensure continued consistency with federal requirements and monitoring objectives. It also confirms and updates information in state and federal monitoring records. Information is pr ovided for all ambient air pollution monitoring which occurred in the County, including sites operat ed by the California Air Resources Board (ARB). Data for ARB sites were obtained from that agency and are accurate to the best of our knowledge.

As detailed in subsequent sections, the SLOCAP CD monitoring network remains unchanged since the last ANP with one exception: the relocation of the Atascadero station. Established at Atascadero Fire Station #1 in1988, it was moved in early 2015 to accommodate extensive renovations and new construction planned for the fire department prop erty. The new location is less than a quarter of mile to the north of the original site, and all mo nitors were retained. A lim ited period of parallel monitoring of ozone and PM 2.5 showed close agreement betwee n the old and new locations.

In 2015 we anticipate that two new source-orien ted monitoring stations will commence operation. First, the SLOCAPCD has required the operator of the Price Canyon Oilfield to begin ambient monitoring for hydrogen sulfide at its oilfield, wh ich is located between the cities of Pismo Beach and San Luis Obispo. Second, through local Rule 1001, we have required the California Department
of Parks and Recreation to establish a PM 10 monitor downwind of undisturbed, natural sand dunes
within the Oceano Dunes State Vehicular Recreati on Area (ODSVRA), a California State Park. The purpose of this monitor is to measure baseline, natural emission s. These measurements will be compared to PM 10 levels measured at the CDF monitoring st ation, which is located downwind of the part of the ODSVRA where off-highway vehicle ac tivity occurs. Both of these new sites will be operated by the permit holders (o r their contractors), and SLOCAPCD will have real-time access to the data that is generated.5 

### General Information on Air Monitoring Networks Most ambient air quality monitoring stations that ar e operated by air quality agencies are classified as State and Local Air Monitoring Station (SLAMS). SLAMS are long-term monitoring stations, and are generally considered to be permanent sites. Their primary objective is to collect data for comparison to the National Ambient Air Quality Standards (NAAQS ). Stations may instead be classified as Special Purpose Monitors (SPM) or Prevention of Sign ificant Deterioration (P SD) stations—these are generally short-term sites with obje ctives other than NAAQS comparison.

Appendix D of 40 CFR 58 specifies design criteria for SLAMS networks and states that networks must be designed to meet a minimum of three basic monito ring objectives: 1. Provide air pollution data to the public in a timely manner; 2. Support complia nce with the NAAQS; and 3. Support air pollution research. A variety of site types are needed to support these basic objectives, including the six general types identified in the Appendix:

 Highest Concentration : Sites located to determine the hi ghest concentration expected to occur in the area covered by the network;

 Population Exposure : Those located to determine represen tative concentrations in areas of high population density;

 Source Oriented : Sites located to determine the impa ct on ambient pollution levels of significant sources or source categories;

 General/Background : Those located to determ ine general background concentration levels;

 Regional Transport : Sites located to determine the exte nt of regional pollutant transport among populated areas, and in suppo rt of secondary standards; and

 Welfare Related Impacts : Sites located to determine the welfare-related impacts in more rural and remote areas (such as visibility impairment and effects on vegetation).

The physical siting of an air monitoring station must conform to the requir ements of the Appendix, and its location must achieve a spatial scale of representativeness that is consistent with the monitoring objective and site type. The spatial scal e results from the physical location of the site with respect to the pollutant sources and categories . It estimates the size of the area surrounding the monitoring site that experiences uniform pollu tant concentrations. The categories of spatial scale defined in the Appendix are:

 Microscale : An area of uniform pollutant concentrati ons ranging from several meters up to
100 meters;

 Middle Scale : uniform pollutant concentrations in an area of about 110 meters to 0.5 kilometer;

 Neighborhood Scale : an area with dimensions in the 0.5 to 4 kilometer range;

 Urban Scale : Citywide pollutant conditions with dimensions from 4 to 50 kilometers;

 Regional Scale : An entire rural area of the same ge neral geography (this area ranges from
tens to hundreds of kilometers); and

 National and Global Scales

.6 The relationship between site type and spatial sc ale is summarized in Table 1, below, which is adapted from Table D-1 of the Appendix.



### Table 1: Relationship between Site Type and Spatial Scale

Site Type A ppropriate Spatial Scale Highest Concentration Micro, middle, neighborhood, (sometimes urban or regional for secondary pollutants) Population Exposure Neighborhood, urban

Source Oriented Micro, middle, neighborhood General/Background Neighb orhood, urban, regional

Regional Transport Urban, regional Welfare Related Impacts Urban, regional7 

### SLAMS Air Monitoring in San Luis Obispo County San Luis Obispo County comprises the San Luis Obispo-Paso Robles Metropolitan Statistical Area (MSA). Air monitoring responsibilities for the MSA are divided between SLOCAPCD and ARB, as allowed by section 2(e) of Appendix D to 40 CFR 58 . SLOCAPCD acknowledges this joint responsibility and is also a member of the ARB Primary Qualit y Assurance Organization (PQAO). The roles and responsibilities of the two agencies with rega rd to fulfilling State and Federal monitoring requirements are formalized in a “Roles and Respon sibilities” document, whic h can be viewed on the
ARB website. 1

There are currently ten permanent ambient air mo nitoring stations (SLAMS) in the County/MSA; their locations are shown in Figure 1. Eight of these stations are operated by the SLOCAPCD as part of our network. ARB operates two additional stations in the county as part of their network, one in Paso Robles and the other in San Luis Obispo. Table 2 lists these stations, the pollutant and meteorological parameters that are monito red at each location and the site type.

Table 2: Summary of Ambient Air Quality Parameters Monitored at SLAMS in San Luis Obispo County

Site Ozone b Nitrogen Dioxide Sulfur Dioxide PM 10 PM 2.5 Wind c Temp

Atascadero P, C P, C P P X X Carrizo Plains T, B X X
CDF S, C S, C X Grover Beach X
Mesa2 S, C S S X X Morro Bay B B X Nipomo Regional Park (NRP) B B B X X Paso Robles a P P X X San Luis Obispo a P P P X X Red Hills T, C X X

Site Types: B = General/Background, C = Highest Conc entration, P = Population Exposure, T = Regional Transport, X = Parameter me asured at this site, S = Source.
Notes: a Paso Robles and San Luis Obispo are operat ed by ARB; all other sites are operated by

SLOCAPCD. b Atascadero is the highest concentration si te for the western county attainment area, while Red Hills is the highest concentration si te for the eastern county non-attainment area. c Wind speed, wind direction, and sigma theta.

1 Air Resources Board, “Quality Management Docume nts, Document Repository, Finalized Roles and Responsibilities,” http://arb.ca.gov/aaqm/qa/ pqao/repository/rr_docs.htm

.8 

### Changes to Monitoring Network since the Previous ANP Changes to the monitoring netw ork since the publication of th e last ANP in May of 2014 are
summarized below.

Opened, Closed, and Relocated Stations At the time of writing, no new stations have open ed in the County, nor have any existing stations
closed.

As noted in the letter accompanying the submittal of our 2014 ANP, the host of our Atascadero SLAMS requested we move the st ation in order to accommodate planned renovations and new construction at the site (Atascadero Fire Station #1 at 6005 Lewis Avenue). Initially we thought that simply shifting the station several feet to the west would be adequate to accommodate their plans; however, after additional discussions it was deci ded that the station be completely removed from the property. Lift Station #5 at 5599 Traffic Way is identified as a potential new location for the station. It is within 400 m (one quarter mile) of the original site (Figure 2). EPA was consulted and approved the new location; a limited period of parallel ozone and PM 2.5 monitoring suggested that any differences between these sites are negligib le. See Appendix D for the EPA approval and Appendix E for a summary of the parallel monitori ng. The station was relocated to this site in February 2015. All of the pollutant s that were monitored at the or iginal site (ozone, oxides of nitrogen, PM 2.5 , PM 10 and meteorology), continue to be monitored at the new site. Figure 1: Locations of the 10 permanent SLAMS stat ions in San Luis Obispo County from May 2014 to May 2015. The thin red line depicts the boundary of the ozone non-attainment area.9 For each monitor, the objective, spatial scale, and site type are the same for the new site as they
were for the old site. It should be noted that simply shutting the station down and discontinuing monitoring in the area is precluded, as this is the 2014 ozone design value site for the Western San Luis Obispo County ozone attainment area. (See Fi gure 1 for the boundary between the attainment and non-attainment areas of the county). Discontinua tion of ozone monitoring is also precluded by 40 CFR 58.14(c)(1), since the upper 90% confidence bo und of mean of the last five years of design values (0.0642 ppm) is greater than 80% of the ozone NAAQS (0.060 ppm). 2 Finally, with a 25-year history of air monitoring, the site is highly valuable for tracking long-term air quality trends, and it is therefore highly desirable to continue monito ring at an equivalent site in the area.

2 The 2010 through 2014 ozone design values are 0. 065, 0.062, 0.063, 0.062, 0.063 ppm. Their mean and standard deviation are 0.0630 and 0.0012 ppm, respectively, and therefore the 90% confidence interval of the 5-year mean is 0.0618 to 0.0642 ppm. Figure 2: Locations of the original and ne w Atascadero ambient air monitoring sites.10 Ozone Monitoring Network Changes
Other than the aforementioned relo cation of the ozone monitor in Atascadero, there has been only one change to the network: the monitor at Red H ills was upgraded from a Teledyne-API 400A to a
T400 in March 2015.

Particulate Monitori ng Network Changes
Other than the relocation of the PM 10 and PM 2.5 monitors in Atascadero, th ere have been no changes to the particulate monitoring network.

Nitrogen Dioxide Monitoring Network Changes
In addition to the relocation of the Atascadero NO 2 monitor, the Teledyne-A PI 200A instrument at this station was upgraded to a T 200 instrument in November 2014.

Sulfur Dioxide Monitoring Network Changes No changes were made to the sulf ur dioxide monitoring network.

Other Changes

 The data loggers at the following sites we re upgraded from ESC 8816s to ESC 8832s: Atascadero (June 2014), CDF (July 2014), Mesa2 (July 2014), and NRP (July 2014).

 The zero-air generator at Mesa2 was upgraded from a Teledyne-API 701 to a T701H in May 2014. The zero-air generator is a component of the gas calibration sy stem at this site.

 A wall mounted air conditioning unit was installed at CDF in May 2014.

 In April 2014 the naturally aspirated temperature sensor at Carrizo Plai ns was replaced with a fan aspirated system (Met One Instrument s 060A-2 probe and 076B radiation shield) and moved from a height of 3 meters to 7 meters. (This should have been mentioned in the last ANP but was inadvertently omitted.)

 In February 2015 the Climatronics temperatu re sensor at Atascadero failed and was replaced with a Met One Inst ruments system (060A-2 probe and 076B radiation shield).11 

### Detailed Network Descriptions

Ozone Monitoring Network All SLAMS in the county monitor for ozone except for CDF, Mesa2, and Grover Beach (see Table 2). The SLAMS network in San Luis Obispo County thus features ozone monitors located in Atascadero, Red Hills, Carrizo Plains, Paso Robles, Morro Bay, San Luis Obispo, and Nipomo Regional Park.

Atascadero – SLOCAPCD has operated an ozone monitor in Atascadero since 1988. As noted above,
this station was moved in 2015 from a site locate d in the central business district of downtown Atascadero to a nearby city property. The origin al location was bounded on two sides by public schools, and the new site is adjacent to a communi ty center. The monitor continues to be classified as population-oriented and neighborhood scale. It also records the highest ozone concentrations in the western San Luis Obispo attainment area. It provides a measurement of representative ozone concentration for the City of Atascadero. Ozone conc entrations at this site exhibit strong diurnal fluctuations caused by the titration of ozone wi th oxides of nitrogen from nearby mobile and
residential sources. Measured conc entrations at this site are similar to those recorded at Paso Robles, and are often the highest among the five ozone monitors in the western portion of the County that is classified as attaining the federa l ozone standard. The highest ozone concentrations at Atascadero occur when high pressure over the interior southwest U.S. causes transport of ozone and other pollutants into the county from the east . Under these infrequent conditions, transported ozone enhanced by local pollutants can cause high ly elevated concentrations. The prevailing winds from the west and northwest help keep ozone levels at Atascadero low most of the time.

Carrizo Plains – Operated by SLOCAPCD since January 2006, this station mo nitors background levels and ozone transport from th e interior areas of the state on a regional scale. The monitor is located in an outbuilding at the Carrizo Plai ns Elementary School. The ozone concentrations recorded here are second only to Red Hills in conc entration and persistence; it is also located within the Eastern San Luis Obispo County non-attainment area.

Morro Bay – Operated since 1975 by SLOCAPCD, this site provides regional scale and general/background ozone monito ring. Located in downtown Morro Bay, the monitor generally measures background leve ls of ozone from the predominant northwest winds blowing off of the Pacific Ocean. Under unusual meteorological co nditions, the site can record elevated ozone concentrations transported from urban areas as far south as the Los Angeles basin.

Nipomo Regional Park – Operated by SLOCAPCD since 1998, th is station provides monitoring of background levels of ozone on a regional sc ale. Previously (1979 to 1996) ozone had been monitored in Nipomo on Wilson Street several miles away. The ozone concentrations measured at NRP are representative of interior portions of th e Nipomo Mesa and are the highest recorded in the coastal region of San Luis Obispo County.

Paso Robles – Operated by ARB since 1974, this popu lation-oriented neighb orhood scale ozone monitor provides a representative ozone concentrat ion for the suburban areas of the City of Paso12 Robles. The conditions under whic h elevated ozone levels occur an d the location’s prevailing winds
are similar to Atascadero.

Red Hills – Operated by SLOCAPCD since 2000, this stat ion is located on the summit of the Red Hills at an elevation of about 2,000 feet. It is in a ve ry sparsely populated area, near the community of Shandon. This regional scale site is often infl uenced by ozone transport from distant pollutant source areas outside of the County, and it consis tently records the highes t and most persistent ozone concentrations in the network; its site type is thus regional and maximum concentration. In early 2012, the eastern portion of the County was de signated as marginally non-attainment for the
federal 8-hr ozone standard based on the design value from this site.

San Luis Obispo – ARB has operated a population-oriente d, neighborhood scale ozone monitor in the City of San Luis Obispo since 1970. The moni tor has been at its current site since 2005. It provides a representative ozone concentration fo r the City of San Luis Obispo. The monitor is
located in the urban area where ozone concentratio ns are significantly depleted by titration with local mobile and stationary NO x sources. As a result the concent rations recorded here are often lower than at Morro Bay.

As noted in Table 2, the SLAMS site types e mployed by the existing ozone network are:

1. Highest Concentration – The Red Hills station typically records the highest ozone concentrations in the County. The high ozone levels tend to occur in the interior areas of the County during summer, either following long peri ods of wind stagnation, or as a result of offshore winds which can transport pollutants from interior regions of the state from distant sources to the northeast. Among the sites in the western portion of the County, which are classified as attaining the oz one standard, Atascadero and Paso Robles measure the highest concentration. In 2014, Atascadero had a high er design value than Paso Robles, but in previous years Paso Robles has often been higher.

2. Population Exposure – The Paso Robles, Atascadero, and San Luis Obispo monitors provide a good representation of the ozone levels in the larger cities of the County.

3. Source Impact – Because ozone is a secondary polluta nt, the effect of emissions from any single source are experienced five to seven ho urs later and often many miles distant. As a regional pollutant, monitoring for specific sources of ozone is not performed.

4. General/Background – The monitors at Morro Bay, Carrizo Plains and Nipomo Regional Park provide regional background ozone levels.

5. Regional Transport – The stations located at Carrizo Pl ains and Red Hills provide excellent surveillance of regional transport of ozone in the interior part of the county. Coastal monitoring stations have provid ed evidence in the past of re gional transport of ozone over
the Pacific Ocean from distant urban sources.13 Nitrogen Dioxide Monitoring Network The SLAMS network in San Luis Obispo County features nitrogen dioxide (NO 2 ) monitors at Atascadero, Morro Bay, and Nipomo Regional Park. NO 2 levels have always been well below the
state and federal standards at all locati ons in our County. For this reason NO 2 monitoring is most
useful here as an indicator of de pletion of ambient ozone through titr ation with nitric oxide. Having
at least one NO 2 monitor in each geographical region of the County also serves a long-term air quality surveillance role.

Atascadero – Operated by SLOCAPCD since 1990 and relo cated in 2015, this population-oriented monitor is considered neighborh ood scale. This is the only NO 2 monitor in the Salinas River air basin, and it records the highest NO, NO 2 and NO x levels in the County. The monitor’s downtown location has established a strong diurnal inverse relationship between ozone and NO 2 levels caused by local mobile sources and residential and commercial combustion of natural gas.

Morro Bay – Operated by SLOCAPCD since 2001 this monitor is neighborhood scale and was
established to monitor emissions from the Morro Ba y power plant, located less than a mile upwind. The plant permanently closed in February 2014.

Nipomo Regional Park – Operated by the SLOCAPCD since 1998, this monitor is regional in scale and is representative of backgro und concentrations on the Nipomo Mesa. The site’s location in a large natural area away from local or mobile sour ces makes it ideal for regional surveillance of NO 2 .
The SLAMS sites in the existing NO 2 network are:

1. Highest Concentration – The Atascadero monitor histor ically has measured the highest

NO 2 concentrations in the county. NO 2 levels are the result of titration of ambient ozone by
local sources of nitric oxide and as a result va lues are always relative ly low. Levels have
never exceeded the 1-hr NO 2 standard (100 ppb), with annua l maximum 1-hr concentrations typically around 50% of the standard.

2. General/Background – With no significant local source s present, the monitors at Nipomo Regional Park and Morro Bay provide excellent information on coastal background levels of

NO 2 .
Regional Transport and Welfare-Related impacts of NO 2 are not currently addressed by the District’s
SLAMS network and are not thought to be significant. With the closure of the Morro Bay power plant in 2014—the only potentially si gnificant point source of NO 2 in the County—no monitors in the
network are considered to be source-oriented. The San Luis Obispo-Paso Robles MSA, does not have—nor per Appendix D, Section 4.3 of 40 CFR 58 is it required to have—any NO 2 sites for vulnerable populations, near-road NO 2 monitoring sites, or area-wide NO 2 sites.

Sulfur Dioxide Monitoring Network The sulfur dioxide (SO 2 ) monitoring network in San Luis Obis po County currently consists of one
station: Mesa2.14 Mesa2 – Established in 1989 and operated by the SLOCAPCD since 2006, this monitor performs surveillance of a nearby oil refine ry. It is considered middle scale and highest concentration for SO 2 . Since it is located close to and downwind of a major source of SO 2 emissions, it is representative only of the immediate area. The station was sited to optimize surveillance of the refinery’s nearby coke calciner, which has since been shut down. No netheless, the refinery remains the largest point
source of SO 2 in the County, and during upsets this mo nitor can record concentrations approaching and sometimes exceeding th e NAAQS. In addition to meeting NA AQS compliance objectives, this site is also vital for public info rmation and emergency response.

The SLAMS SO 2 monitoring objectives met by the network are:

1. Highest Concentration – The monitor at Mesa2 currently records the highest SO 2 levels in the County.

2. Source Impact – The monitor at Mesa2 is in valuable in determining the SO 2 source impact upon the immediate region.

Monitoring objectives not addressed by the existing SO 2 network are: General/Background, Population, Regional Transport, an d Welfare-Related. Historical SO 2 monitoring performed elsewhere in the county (at NRP from 1998-2006; Morro Bay, 1979-1995; Gr over Beach, 1982-2004; and at decommissioned stations in Arroyo Gran de “Ralcoa” (06-079-1005) , 1991-2002, and “Mesa1” (06-079-3002), 1987-94) has provided good evidence that monitoring for th ese objectives is not needed. Furthermore, background levels of SO 2 in the County are believed to negligible, since more than 98% of hourly SO 2 levels from Mesa2 were 1 ppb or less in 2014.

Particulate Monitoring Network The particulate monitoring network in San Luis Ob ispo County consists of six Federal Equivalent Method (FEM) PM 10 monitors (Paso Robles, Atascadero, Sa n Luis Obispo, Mesa2, CDF and Nipomo Regional Park) and four FEM PM 2.5 monitors (Atascadero, CDF, Mesa 2 and San Luis Obispo). The PM 10 network has been in place since 1988, and PM2.5 sa mplers began operation in 1999 in response to
the establishment of a new federal standard for PM 2.5 in 1997. Originally all particulate monitoring in the County was performed as part of ARB’s network, but eventually all monitors except those at Paso Robles and San Luis Obispo became part of the SLOCAPCD network. Note that for quality assurance the District remains part of the ARB PQ AO. SLOCAPCD therefore relies on ARB to perform federally required audits of its particulate monito rs and to meet federal collocation requirements.

Initially, all particulate sampling was conducted by filter-based Federal Reference Method (FRM)
methods. With the advent of continuous monito ring technologies, all the FRM monitors in the County have been replaced with FEM monitors in re cent years. These are continuous semi-real time monitors that report hourly PM concentratio ns. The hourly data has greatly improved the SLOCAPCD abilities to issue timely air quality fo recast which is a sign ificant benefit for the advancement of public health goals.15 Atascadero – Operated by SLOCAPCD, PM 10 monitoring has been conducted here since 1988, initially via a FRM and currently with a continuous FEM monitor. Collocated FRM PM 2.5 monitors began operation in 1999 and have since been re placed by a single FEM. All monitors are neighborhood in scale and representative of particul ate concentrations in the City of Atascadero. As previously noted, the station was moved about 400m north of its original location in February 2015.

CDF – Originally established for the SLOCAPCD’s Nipo mo Mesa Phase 2 Particulate Study, this site has become a permanent part of SLAMS particulate network. The site features continuous FEM samplers for PM 10 and PM 2.5 , which are neighborhood in scale and measure source impacts from the ODSVRA. These monitors record the highest part iculate levels in the County and are strongly influenced by the ODSVRA, located directly upwind . In 2012, extensive temp orary monitoring on the Nipomo Mesa confirmed that this si te is located within the 1 square mile sector of the study area that experiences the highest PM 10 levels. 3

Mesa2 – PM 10 sampling began at this site in 1991, and the monitors have been operated by the SLOCAPCD since 2006. This site initially featured collocated FRM PM 10 samplers that were replaced by a single continuous FEM PM 10 monitor in 2009. A continuous PM 2.5 FEM monitor was installed at the same time. This site monitors source impacts from the nearby oil refinery and coastal dunes and
the monitors are considered to be neighborhood scale. These monito rs record some of the highest particulate levels in the County and are strongly in fluenced by the extensive coastal sand dunes and the ODSVRA located upwind.

Nipomo Regional Park – Operated at this location by SLOCAPCD since 1998, it replaced a site at Wilson Street in Nipomo that operat ed from 1990-96. The 1-in-6 day FRM PM 10 sampler was replaced with a continuous FEM sampler in 20 10. The monitor is regional in scale and is representative of PM 10 concentrations on the Nipomo Mesa.

Paso Robles – Operated by ARB since 1991 this PM 10 monitor is urban in scal e and representative of the city of Paso Robles. The FRM sampler at this site was replaced with an FEM PM 10 sampler in August 2009.

San Luis Obispo – Operated by ARB, a PM 10 sampler has been in place since 1988, and a PM 2.5 sampler since 1999. ARB replaced the FRM sampler s with continuous FEM instruments in 2011. These population-oriented monitors are neighb orhood in scale and represent particulate concentrations in the City of San Luis Obispo.

Other Networks San Luis Obispo County, which comprises the San Lu is Obispo-Paso Robles MS A, is not required to have—nor does it have—any NCORE, PAMS, lead , carbon monoxide or near-road monitoring
stations.

3 San Luis Obispo County Air Pollution Control District, “South County Community Monitoring Project,” January 2013. Available online: http://slocleanair.org/communitymonitoringproject16 

### Proposed Network Chang es and Improvements The following modifications will likely occur in the 18 month period after the pub lication of this ANP.

New Stations and Station Closures and Relocations Currently, there are no plans to establish any new SLAM S or to close or relocate any existing stations within the next 18 months. Note that with a po pulation well below 500,000, the San Luis ObispoPaso Robles MSA/CBSA 4 is not required to have any near-road NO 2 , CO, or PM 2.5 monitors, and therefore SLOCAPCD has no plans to establish any such monitors.

Ozone Monitoring Network
The ozone monitor Carrizo Plains is scheduled to be upgraded from a Tele dyne-API 400A instrument

to a T400.

Nitrogen Dioxide Network No changes to the nitrogen dioxide monitoring network are anticipated.

Sulfur Dioxide Monitoring Network No changes to the sulfur dioxide mo nitoring network are anticipated.

Particulate Monitoring Network No changes to the particulate moni toring network are anticipated.

Statement Regarding Review of Changes to the PM 2.5 Network
In the event that SLOCACPD needs to change the location of a PM 2.5 monitor that records violations of the NAAQS, the ag ency will notify EPA Region 9 and ARB contact points immediately, and work closely with ARB to formulate a plan for moving the site. The public will be notified of the plan and provided with an opportunity to comment for at least 30 days. Finally, the agency will submit formal
notification to EPA. The SLOCAPCD intends to di scuss and receive approval of any changes to our

PM 2.5 Network—whether they affect mo nitors violating NAAQS or not—with ARB and EPA prior to making them, however unforeseen circumstances (e.g . unexpected loss of site access) may preclude
this.

Other Changes and Improvements:

1. The ozone calibrator at Red Hills is scheduled to be upgraded from a Teledyne 703E to a T703. Pending funding, other calibrators ma y also be upgraded from E to T-series

instruments.

2. All sites are scheduled to have high speed inte rnet connections installed, and data retrieval will be upgraded from dial-up communication at 9600 baud to retrieval over the internet.

4 San Luis Obispo County, the Sa n Luis Obispo-Paso Robles MSA, and the San Luis Obispo-Paso Robles Core Based Statistical Area (CBSA) have identical borders and populations.17 

## Non-SLAMS Air Monitoring in San Luis Obispo County

Oceano Dunes Monitoring Frequent exceedences of the California A mbient Air Quality Standard for 24-hour PM 10 (50  g/m 3 )
are observed downwind of the ODSVRA on the Ni pomo Mesa. To address these exceedences, the SLOCAPCD Board of Directors approved Coastal Du nes Dust Control Rule 1001. The rule requires,
inter alia , the ODSVRA operator (i.e., California State Parks) to monitor PM 10 levels in at least two
locations within or downwind of the ODSVRA: on e downwind of an area where off-road vehicle activity is allowed (“riding area monitor”), and another downwind of a comparable area where offroad vehicle activity is not allowed (“control site mo nitor”). This monitoring is to be performed with
continuous FEM monitors. 5

SLOCAPCD and the operator have agreed to use our CDF monitoring station as the riding area monitor. This site will continue to be operated by SLOCAPCD as a SLAMS. The operator is in the process of establishing the contro l site monitor within the ODSVRA. This site will host a MetOne BAM

1020 as its PM 10 monitor and will also have meteorolog ical equipment. Rule 1001 requires the PM 10 monitor to be operational and reporting data by Ma y 31, 2015. It will be op erated by SLOCAPCD, and
raw data will be available in real-time. Validated data will be reviewed by the District, and we will upload the data to the Air Quality System (AQS). This site will be design ated as special purpose monitor in AQS rather than as a SLAMS.

Also of note, in 2013 the operator conducted a PM 10 monitoring campaign within the ODSRVA using
non-FEM, MetOne E- BAM monitors. The PM 10 levels observed within the ODSVRA were generally much higher than those recorded downwind at our CDF and Mesa2 SLAMS. Contractors for the operator also made several hund red emissivity measur ements of the dune surface. Reports summarizing the results of these campaign s are available on the District website. 5



### Price Canyon Monitoring The Price Canyon Oilfield is located in Price Ca nyon between Pismo Beach and the Edna Valley wine region, just south of the City of San Luis Obis po. This area has long been plagued by odors emanating from the field. Therefore, as a conditio n of a permit for expanded oilfield operations, SLOCAPCD is requiring on-sit e ambient hydrogen sulfide (H 2 S) monitoring. This is anticipated to begin by June 2015, and will employ a Thermo Scientific 450i H 2 S analyzer. SLOCAPCD will have
access to raw data in real-time. There is curre ntly no plan to submit this data to AQS.

5 San Luis Obispo County Air Pollution Co ntrol District, “Coastal Dunes Rule 1001,” http://slocleanair.org/air/pmstudydata.php

.18 

## Air Quality Data
All of the SLAMS monitoring statio ns currently operating in the County are registered with the EPA and ARB and regularly report data to the EPA’ s AQS database, ARB’s AQ MIS2 website, and the airnow.gov website. Validated data from sites op erated by SLOCAPCD are always submitted to AQS by end of the quarter following the quarter in wh ich they were collected; usually data is submitted
well before this deadline. Raw da ta is uploaded automatically to AQMIS and airnow.gov typically within an hour after being generated in the fiel d. In addition, raw data for the current day and previous day is available on the SLOCAPCD website. All data generated at these stations are public
information and are available in various formats. Table 3, below, lists some popular sources for
these data.

SLOCAPCD, and when applicable ARB, regularly su bmit precision and accuracy data to AQS for all gaseous and particulate pollutants measured in the network. Additionally, in accordance with 40 CFR 58.15, SLOCAPCD certifies its AQS dataset for the previous year ev ery spring. SLOCAPCD submitted a certification package for calendar year 2014 data to EPA on April 7, 2015.

Table 3: Sources for Air Quality Data from San Luis Obispo

Agency Address for Data Requests W ebsite for
Data Access Data Available Online

SLOCAPCD 3433 Robert Ct., San Luis Obispo, CA 93401 www.slocleanair.org/ air/lasthour.php Raw data from last 24 to 48 hours. Only sites operated by
SLOCAPCD.
ARB P.O. Box 2815 Sacramento, CA 95812 A QMIS2: www.arb.ca.gov/aqmi s2/aqdselect.php

ADAM: www.arb.ca.gov/ada
m/ Most California sites, including all sites in San Luis Obispo County. Real-time raw data and archived validated data.

EPA Ariel Rios Building 1200 Pennsylvania Ave NW Washington, DC 20460 A QS: www.epa.gov/ttn/airs /airsaqs/detaildata V alidated data from across the U.S. Typically one to several months behind current date.

AirNow.gov U.S. EPA – OAQPS – ITG Mail Code E143-03 Research Triangle Park, NC
27711 www.airnow.gov Current air quality conditions, nationwide. Based on real time, raw data.19Appendix A: Minimum Monitoring RequirementsThe SLOCAPCD monitoring network meets the minimum monitoring requirements for all criteria pollutants as established in 40 CFR58.The tables below list the criteria used todetermine compliance with Federal regulations. The Countypopulation cited in thesetables(269,637) is from the 2010 census; the California Department of Finance estimates thepopulation to be 272,357 as of January 1,2014.6Using this figure in lieu of the official census number does not change the required number of sites for any pollutant.Minimum Monitoring Requirements for Ozone (O3)MSACountyPopulation(Census Year)8-hour Design Value(years)aDesign Value Site Name(AQS ID)Number ofRequiredSitesbNumberof ActiveSitesNumber ofAdditionalSites NeededSan Luis ObispoPaso RoblesSan LuisObispo269,637(2010)76 ppb (2012-14) Red Hills (06-079-8005) 1 7 0aThis Design Value is for eastern San LuisObispo County, which in early 2012 was designated as marginally non-attainment for the 20088-hour ozone standard. The design value for the rest of the county is 63 ppb (2012-14), and the corresponding design value siteisAtascadero (06-079-8001).bRefer to section 4.1 and Table D-2 of Appendix D to 40 CFR Part 58 for requirements.Monitors required for SIP or Maintenance Plan:None6California Department of Finance, “E-1, Current Population Estimates,” May 1, 2014.http://www.dof.ca.gov/research/demographic/reports/estimates/e-1/view.php20Minimum Monitoring Requirements for PM2.5SLAMsMSACountyPopulation(CensusYear)AnnualDesignValue(years)AnnualDesign ValueSite(AQS ID)DailyDesignValue(years)Daily DesignValue SiteName(AQS ID)Number ofRequiredSLAMSSitesaNumberof ActiveSLAMSSitesNumber ofAdditionalSLAMSSitesNeededSan LuisObispo-PasoRoblesSan LuisObispo269,637(2010)11.6g/m3(2012-14)CDF(06-079-2007)30g/m3(2012-14)CDF(06-079-2007)1 4 0aRefer to section 4.7.1 and Table D-5 of Appendix D to 40 CFR Part 58 for requirements.Monitors required for SIP or Maintenance Plan:NoneMinimum Monitoring Requirements for Continuous PM2.5MonitorsMSACountyPopulation(CensusYear)AnnualDesignValue(years)AnnualDesign ValueSite(AQS ID)DailyDesignValue(years)Daily DesignValue SiteName(AQS ID)Number ofRequiredContinuousMonitorsaNumber ofActiveContinuousMonitorsNumber ofAdditionalContinuousMonitorsNeededSan LuisObispo -Paso RoblesSan LuisObispo269,637(2010)11.6g/m3(2012-14)CDF(06-079-2007)30g/m3(2012-14)CDF(06-079-2007)1 4 0aRefer to section 4.7.2 and Table D-5 of Appendix D to 40 CFR Part 58 for requirements.Monitors required for SIP or Maintenance Plan:None21Minimum Monitoring Requirements for PM10MSACountyPopulation(Census Year)MaximumConcentration(Year)MaximumConcentration SiteName (AQS ID)Number ofRequiredSitesaNumberof ActiveSitesNumber ofAdditionalSites NeededSan Luis ObispoPaso RoblesSan LuisObispo269,637(2010)165g/m3(2014) CDF (06-079-2007) 1-2 6 0aRefer to section 4.6 and Table D-4 of Appendix D to 40 CFR Part 58 for requirements.Monitors required for SIP or Maintenance Plan:NoneMinimum Monitoring Requirements for Nitrogen Dioxide (NO2)CBSAPopulation(CensusYear)MaximumAADT Count(Years)Number ofRequiredNear-roadMonitorsaNumber ofActiveNear-roadMonitorsNumber ofAdditionalNear-roadMonitorsNeededNumber ofRequiredArea-wideMonitorsaNumberof ActiveArea-wideMonitorsNumber ofAdditionalArea-wideMonitorsNeededSan Luis ObispoPaso Robles269,637(2010)76,000(2013)0 0 0 0 3 0aRefer to section 4.3 of AppendixD to 40 CFR Part 58 for requirements.Monitors required for SIP or Maintenance Plan:NoneMonitors required for PAMS:NoneEPA Regional Administrator-requiredmonitors per 40 CFR 58, App. D 4.3.4:None22Minimum Monitoring Requirements for Sulfur Dioxide (SO2)CBSACountyPopulation(CensusYear)Total SO2a(Tons/year)Population WeightedEmissions Index(million persontons/year)bNumber ofRequiredMonitorscNumber ofActiveMonitorsNumber ofAdditionalMonitorsNeededSan Luis ObispoPaso RoblesSan LuisObispo269,637(2010)272 73 0 1 0aFrom the 2011 National Emissions Inventory.http://www.epa.gov/ttn/chief/net/2011inventory.htmlbProduct of CBSA population and SO2emissions, divided by one million.cRefer to section 4.4 of AppendixD to 40 CFR Part 58 for requirements.Monitors required for SIP or Maintenance Plan:NoneMinimum Monitoring Requirementsfor Carbon Monoxide (CO)CBSAPopulation(CensusYear)Number of RequiredNear-Road MonitorsaNumber of ActiveNear-Road MonitorsNumber of AdditionalMonitors NeededSan Luis ObispoPaso Robles269,637(2010)0 0 0aRefer to section 4.2 of Appendix Dto 40 CFR Part 58 for requirements.Monitors required for SIP or Maintenance Plan:NoneEPA Regional Administrator-required monitors per section 4.2.2. of Appendix D to 40 CFR 58:None23Minimum Monitoring Requirementsfor Lead (Pb) at NCoreNCore SiteCBSAPopulation(Census Year)Number ofRequired MonitorsaNumber of ActiveMonitorsNumber of AdditionalMonitors NeedednoneSan Luis ObispoPaso Robles269,637 (2010) 0 0 0aRefer to section 4.5 of Appendix Dto 40 CFR Part 58 for requirements.Source-Oriented Lead Monitoring (Including Airports)SourceAddressPb Emissions(Tons/yr)EmissionsInventory SourceData (Year)Max3-MonthDesign ValueDesignValueDateNumber ofRequiredMonitorsaNumberof ActiveMonitorsNumber ofAdditionalMonitors Needednone n/a n/a n/a n/a n/a 0 0 0aRefer to section 4.5 of Appendix Dto 40 CFR Part 58 for requirements.Monitors required for SIP or Maintenance Plan:NoneEPA Regional Administrator-required monitors per section 4.5(c) of Appendix D to 40 CFR 58:None24 

## Appendix B: Collocation Requirements
Particulate monitoring (PM 10 , PM 2.5 , and lead) is subject to the collo cation requirements described in section 3 of Appendix A to 40 CFR 58. The requirem ents apply at the PQAO level, and SLOCAPCD is part of the ARB PQAO. All particulate monitors in San Luis Obispo Co unty are MetOne 1020 Beta Attenuation Monitors (BAMs). These are continuous FEM instruments (PM 10 method code: 122; PM 2.5 method code: 170). There are no collocated parti culate monitors within the SLOCAPCD network; however as described below, there are co llocated monitors within the ARB PQAO.

It is unknown whether collo cation requirements for PM 2.5 are being met at the statewide PQAO level. According to ARB’s most recent Annual Monitori ng Report for Small Districts in California, 7 in 2013
there were 32 active PM 2.5 FEM BAM 1020 monitors (method 170) in the PQAO; thus five collocated monitors were needed: three FRM/FEM pairs and tw o FEM/FEM pairs. The repo rt indicates that the ARB PQAO met the minimum FEM/FEM collocation requ irements for its network, but needed to add a collocated FRM/FEM pair. The report discusses plan s for establishing the needed FRM/FEM pair at the Madera site, and AQS shows an FRM reporting at this site starting in June 2014. Thus it would appear that the collocation requirement has been sati sfied, though it is also possible that additional
method 170 monitors have come on line since then, triggering the need for additional collocated monitors. An AQS Certification and Concurrence Report (AMP600) for 2014 (executed in March 2015), reported a slightly different number of mo nitors, and also indicated that collocation requirements were not being met for that year. See Table B-1 below.

With regard to PM 10 monitoring, all monitors in the Distri ct are continuous FEM BAMs, and thus there are no collocation requirements. Finally, lead monitoring is not done in the County, and thus there is no collocation requirement.

Table B- 1: Collocation Requirements for PM 2.5 , Method Code 170

Data
Source (see text) Number of Primary
Monitors Number of Required
Collocated

Monitors Number of
Active
Collocated FRM
Monitors Number of Active
Collocated FEM Monitors (same method designation as primary)

ARB 32 5 2 2

AMP600 33 5 4 total collocated monitors, type not indicated

7 Air Resources Board, “Annual Monitoring Network Re port for Twenty-three Districts in California,” June 2014. http://www.arb.ca.gov/aqd/amnr/amnr2014draft.pdf

.25 

## Appendix C: Detailed Site Information

Local site name Paso Robles AQS ID 06-079-0005 GPS coordinates (decimal degrees) 35.61467, -120.65691 Street Address 235 Santa Fe Ave, Paso Robles County San Luis Obispo Distance to roadways (meters) 27 to Santa Fe Ave. 110 to Sherwood Rd. 180 to Creston Rd.
2700 to US 101 Traffic count (AADT, year) Santa Fe A ve.: 75 (estimated) Sherwood Rd.: 10,000 (2008) Creston Rd: 5,500 (2008) US101: 36,300 (2013) Groundcover (e.g. asphalt, dirt, sand) A sphalt Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC Ozone, 1 PM 10 , 2 Primary / QA Collocated / Other N/A Primary Parameter code 44201 81102 Basic monitoring objective(s) NAAQS Comparison Public info, NAAQS Comparison Site type(s) Population Exposure Population Exposure Monitor type(s) SLAMS SLAMS Network Affiliation N/A N/A Instrument manufacturer and model A PI 400E MetOne BAM 1020 Method code 087 122 FRM/FEM/ARM/other FEM FEM Collecting Agency A RB ARB Analytical Lab (i.e. weigh lab, toxics lab, other) N/A N/A Reporting Agency A RB ARB Spatial scale (e.g. micro, neighborhood) Neighborhood Neighborhood Monitoring start date (MM/DD/YYYY) 09/01/1991 06/01/2013 a Current sampling frequency (e.g. 1:3, continuous) continuous continuous Calculated sampling frequency (e.g. 1:3/1:1) continuous continuous Sampling season (MM/DD-MM/DD) 01/01-12/31 01/01-12/31 Probe height (meters) 6.2 5.2 Distance from supporting structure (meters) 2.9 1.9 Distance from obstructions on roof (meters) N/A N/A Distance from obstructions not on roof (meters) N/A N/A Distance from trees (meters) N/A N/A Distance to furnace or incinerator flue (meters) N/A N/A Distance between monitors fulfilling a QA Collocation requirement (meters) N/A N/A26 Local site name Paso Robles For low volume PM instruments, is any PM instrument within 1 m of the instrument? N/A No

For high volume PM instruments, is any PM instrument within 2m of the instrument? N/A N/A

Unrestricted airflow (degrees) 360 360 Probe material for reactive gases (e.g. Pyrex, stainless steel, Teflon) Teflon N/A

Residence time for reactive gases (seconds) 13.9 N/A Will there be changes within the next 18 months? No No Is it suitable for comparison against the annual
PM2.5? N/A N/A

Frequency of flow rate verification for manual PM samplers N/A N/A

Frequency of flow rate verification for automated PM analyzers N/A bi-weekly

Frequency of one-point QC check for gaseous
instruments daily N/A

Date of 2014 Annual Performance Evaluation for gaseous parameters 11/18/2014 b

12/18/2014 c N/A

Dates of 2014 Semi-Annual Flow Rate Audits for PM
monitors N/A 5/14/2014
12/18/2014

a This instrument did not begin reporting PM 10 -standard (88102) until 06/01/2013, but has been reporting PM 10 -actual (85101) since 08/11/2009.

b Performed by ARB.

c Performed by EPA.27 Local site name Grover Beach AQS ID 06-079-2001 GPS coordinates (decimal degrees) 35.12393, -120.63222 Street Address 9 Le Sage Drive, Grover Beach County San Luis Obispo Distance to roadways (meters) 10 to Le Sage Drive
120 to US 1 Traffic count (AADT, year ) Le Sage: 300 (estimated) US 1: 9000 (2013) Groundcover (e.g. asphalt, dirt, sand) Cement and dirt Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC None (this is meteorology-only station)28 Local site name Mesa2 AQS ID 06-079-2004 GPS coordinates (decimal degrees) 35.02079, -120.56389 Street Address 1300 Guadalupe Rd., Nipomo County San Luis Obispo Distance to roadways (meters) 40 to Guadalupe Rd. (US 1) Traffic count (AADT, year) Guadalupe Rd. (US 1): 6000 (2013) Groundcover (e.g. asphalt, dirt, sand) V egetative Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC SO 2 , 1 PM 2.5 , 1 PM 10 , 3 Primary / QA Collocated / Other N/A Primary Primary Parameter code 42401 88101 81102 Basic monitoring objective(s) NAAQS Comparison NAAQS Comparison NAAQS Comparison Site type(s) Source Oriented, Max
Concentration Source Oriented Source Oriented

Monitor type(s) SLAMS SLAMS SLAMS Network Affiliation N/A N/A N/A Instrument manufacturer and model A PI T100U MetOne BAM
1020 MetOne BAM
1020 Method code 100 170 122 FRM/FEM/ARM/other FEM FEM FEM Collecting Agency SLOCAPCD SLOCAPD SLOCAPCD Analytical Lab (i.e. weigh lab, toxics lab, other) N/A N/A N/A Reporting Agency SLOCAPCD SLOCAPCD SLOCAPCD Spatial scale (e.g. micro, neighborhood) Middle Neighborhood Neighborhood Monitoring start date (MM/DD/YYYY) 05/01/1989 07/01/2009 07/01/2009 Current sampling frequency (e.g. 1:3, continuous) continuous continuous continuous

Calculated sampling frequency (e.g. 1:3/1:1) continuous continuous continuous Sampling season (MM/DD-MM/DD) 01/01-12/31 01/01-12/31 01/01-12/31 Probe height (meters) 4.8 4.8 4.8 Distance from supporting structure (meters) 1.3 1.3 1.3 Distance from obstructions on roof (meters) N/A N/A N/A Distance from obstructions not on roof (meters) N/A N/A N/A

Distance from trees (meters) N/A N/A N/A Distance to furnace or incinerator flue (meters) N/A N/A N/A

Distance between monitors fulfilling a QA Collocation requirement (meters) N/A N/A N/A

For low volume PM instruments, is any PM instrument within 1 m of the instrument? N/A No No

For high volume PM instruments, is any PM N/A N/A N/A29 Local site name Mesa2 instrument within 2m of the instrument? Unrestricted airflow (degrees) 360 360 360 Probe material for reactive gases (e.g. Pyrex, stainless steel, Teflon) Teflon N/A N/A

Residence time for reactive gases (seconds) 8.1 N/A N/A Will there be changes within the next 18 months? No No No

Is it suitable for comparison against the annual
PM2.5? N/A Y es N/A

Frequency of flow rate verification for manual PM samplers N/A N/A N/A

Frequency of flow rate verification for automated PM analyzers N/A bi-weekly bi-weekly

Frequency of one-point QC check for gaseous
instruments daily N/A N/A

Date of 2014 Annual Performance Evaluation for gaseous parameters 5/20/2014 N/A N/A

Dates of 2014 Semi-Annual Flow Rate Audits for PM monitors N/A 5/20/2014
10/30/2014 5/20/2014
10/30/201430 Local site name San Luis Obispo AQS ID 06-079-2006 GPS coordinates (decimal degrees) 35.25651, -120.66945 Street Address 3220 South Higu era St., San Luis Obispo County San Luis Obispo Distance to roadways (meters) 57 to South Higuera St.
450 to US 101 Traffic count (AADT, year) South Higuera St.: 13,980 (2012) US 101: 58,600 (2013) Groundcover (e.g. asphalt, dirt, sand) V egetative Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC O 3 , 1 PM 2.5 , 3 PM 10 , 2 Primary / QA Collocated / Other N/A Primary Primary Parameter code 44201 88101 81102 Basic monitoring objective(s) NAAQS Comparison NAAQS Comparison NAAQS Comparison, Public Info Site type(s) Population Exposure General/ Background Population Exposure Monitor type(s) SLAMS SLAMS SLAMS Network Affiliation N/A N/A N/A Instrument manufacturer and model A PI T400 MetOne BAM
1020 MetOne BAM
1020 Method code 087 170 122 FRM/FEM/ARM/other FEM FEM FEM Collecting Agency A RB A RB ARB Analytical Lab (i.e. weigh lab, toxics lab, other) N/A N/A N/A Reporting Agency A RB A RB ARB Spatial scale (e.g. micro, neighborhood) Neighborhood Neighborhood Neighborhood Monitoring start date (MM/DD/YYYY) 09/21/2005 03/15/2011 06/01/2013 a Current sampling frequency (e.g. 1:3, continuous) continuous continuous continuous

Calculated sampling frequency (e.g. 1:3/1:1) continuous continuous continuous Sampling season (MM/DD-MM/DD) 01/01-12/31 01/01-12/31 01/01-12/31 Probe height (meters) 12.8 12.8 12.8 Distance from supporting structure (meters) 1.8 2.0 2.0 Distance from obstructions on roof (meters) N/A N/A N/A Distance from obstructions not on roof (meters) N/A N/A N/A

Distance from trees (meters) N/A N/A N/A Distance to furnace or incinerator flue (meters) N/A N/A N/A

Distance between monitors fulfilling a QA Collocation requirement (meters) N/A N/A N/A

For low volume PM instruments, is any PM N/A No No31 Local site name San Luis Obispo instrument within 1 m of the instrument? For high volume PM instruments, is any PM instrument within 2m of the instrument? N/A N/A N/A

Unrestricted airflow (degrees) 360 360 360 Probe material for reactive gases (e.g. Pyrex, stainless steel, Teflon) Teflon N/A N/A

Residence time for reactive gases (seconds) 8.7 N/A N/A Will there be changes within the next 18 months? No No No

Is it suitable for comparison against the annual PM2.5? N/A Y es N/A

Frequency of flow rate verification for manual PM samplers N/A N/A N/A

Frequency of flow rate verification for automated PM analyzers N/A bi-weekly bi-weekly

Frequency of one-point QC check for gaseous
instruments daily N/A N/A

Date of 2014 Annual Performance Evaluation for gaseous parameters 11/18/2014 N/A N/A

Dates of 2014 Semi-Annual Flow Rate Audits for PM monitors N/A 5/14/2014
11/18/2014 5/14/2014
11/18/2014

a This instrument did not begin reporting PM 10 -standard (88102) until 06/01/2013, but has been reporting PM 10 -actual (85101) since 03/ 15/2011 as 06-079-2006-85101-3.32 Local site name CDF AQS ID 06-079-2007 GPS coordinates (decimal degrees) 35.04673, -120.58777 Street Address 2391 Willow Rd., Arroyo Grande County San Luis Obispo Distance to roadways (meters) 53 to Willow Rd. (US 1). Traffic count (AADT, year) Willow Rd. (US1): 6,500 Groundcover (e.g. asphalt, dirt, sand) V egetative, Sand Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC PM 2.5 , 1 PM 10 , 2 Primary / QA Collocated / Other Primary Primary Parameter code 44201 81102 Basic monitoring objective(s) NAAQS Comparison NAAQS Comparison Site type(s) Max Concentration, Source Oriented Max Concentration, Source Oriented Monitor type(s) SLAMS SLAMS Network Affiliation N/A N/A Instrument manufacturer and model MetOne BAM 1020 MetOne BAM 1020 Method code 170 122 FRM/FEM/ARM/other FEM FEM Collecting Agency SLOCAPCD SLOCAPCD Analytical Lab (i.e. weigh lab, toxics lab, other) N/A N/A Reporting Agency SLOCAPCD SLOCAPCD Spatial scale (e.g. micro, neighborhood) Neighborhood Neighborhood Monitoring start date (MM/DD/YYYY) 08/01/2010 01/01/2010 Current sampling frequency (e.g. 1:3, continuous) continuous continuous Calculated sampling frequency (e.g. 1:3/1:1) continuous continuous Sampling season (MM/DD-MM/DD) 01/01-12/31 01/01-12/31 Probe height (meters) 4.0 4.0 Distance from supporting structure (meters) 1.4 1.4 Distance from obstructions on roof (meters) N/A N/A Distance from obstructions not on roof (meters) N/A N/A Distance from trees (meters) N/A N/A Distance to furnace or incinerator flue (meters) N/A N/A Distance between monitors fulfilling a QA Collocation requirement (meters) N/A N/A

For low volume PM instruments, is any PM instrument within 1 m of the instrument? N/A No

For high volume PM instruments, is any PM instrument within 2m of the instrument? N/A N/A

Unrestricted airflow (degrees) 360 360 Probe material for reactive gases (e.g. Pyrex, stainless steel, Teflon) N/A N/A33 Local site name CDF Residence time for reactive gases (seconds) N/A N/A Will there be changes within the next 18 months? No No Is it suitable for comparison against the annual
PM2.5? Y es N/A

Frequency of flow rate verification for manual PM samplers N/A N/A

Frequency of flow rate verification for automated PM analyzers bi-weekly bi-weekly

Frequency of one-point QC check for gaseous instruments N/A N/A

Date of 2014 Annual Performance Evaluation for gaseous parameters N/A N/A

Dates of 2014 Semi-Annual Flow Rate Audits for PM
monitors 5/20/2014
10/30/2014 5/20/2014
10/30/201434 Local site name Morro Bay AQS ID 06-079-3001 GPS coordinates (decimal degrees) 35.36640, -120.84268 Street Address 899 Morro Bay Blvd., Morro Bay County San Luis Obispo Distance to roadways (meters) 37 to Morro Bay Blvd.
220 to CA 1 Traffic count (AADT, year) Morro Bay Blvd.: 12,400 (2006) CA 1: 20,600 (2013) Groundcover (e.g. asphalt, dirt, sand) Paved Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC O 3 , 1 NO 2 , 1 Primary / QA Collocated / Other N/A Primary Parameter code 44201 42602 Basic monitoring object ive(s) NAAQS Comparison NAAQS Comparison Site type(s) General/Background General/Background Monitor type(s) SLAMS SLAMS Network Affiliation N/A N/A Instrument manufacturer and model A PI 400A API T200U Method code 087 599 FRM/FEM/ARM/other FEM FRM Collecting Agency SLOCAPCD SLOCAPCD Analytical Lab (i.e. weigh lab, toxics lab, other) N/A N/A Reporting Agency SLOCAPCD SLOCAPCD Spatial scale (e.g. micro, neighborhood) Regional Neighborhood Monitoring start date (MM/DD/YYYY) 01/01/1981 06/01/2001 Current sampling frequency (e.g. 1:3, continuous) continuous continuous Calculated sampling frequency (e.g. 1:3/1:1) continuous continuous Sampling season (MM/DD-MM/DD) 01/01-12/31 01/01-12/31 Probe height (meters) 4.0 4.0 Distance from supporting structure (meters) 1.4 1.4 Distance from obstructions on roof (meters) N/A N/A Distance from obstructions not on roof (meters) N/A N/A Distance from trees (meters) N/A N/A Distance to furnace or incinerator flue (meters) N/A N/A Distance between monitors fulfilling a QA Collocation requirement (meters) N/A N/A

For low volume PM instruments, is any PM instrument within 1 m of the instrument? N/A N/A

For high volume PM instruments, is any PM instrument within 2m of the instrument? N/A N/A

Unrestricted airflow (degrees) 360 360 Probe material for reactive gases (e.g. Pyrex, stainless steel, Teflon) Teflon Teflon35 Local site name Morro Bay Residence time for reactive gases (seconds) 7.6 7.0 Will there be changes within the next 18 months? No No Is it suitable for comparison against the annual
PM2.5? N/A N/A

Frequency of flow rate verification for manual PM samplers N/A N/A

Frequency of flow rate verification for automated PM analyzers N/A N/A

Frequency of one-point QC check for gaseous
instruments daily daily

Date of 2014 Annual Performance Evaluation for gaseous parameters 03/12/2014 03/12/2014

Dates of 2014 Semi-Annual Flow Rate Audits for PM
monitors N/A N/A36 Local site name Nipomo Regional Park (NRP) AQS ID 06-079-4002 GPS coordinates (decimal degrees) 35.03150, -120.50101 Street Address W. Tefft St . and Pomeroy Rd., Nipomo County San Luis Obispo Distance to roadways (meters) 500 To Tefft St. 240 to Pomeroy Rd. Traffic count (AADT, year) Tefft St.: 1,500 (2009) Pomeroy Rd.: 6400 (2008) Groundcover (e.g. asphalt, dirt, sand) V egetative Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC O 3 , 1 NO 2 , 1 PM 10 , 2 Primary / QA Collocated / Other N/A Primary Primary Parameter code 44201 42602 81102 Basic monitoring objective(s) NAAQS Comparison NAAQS Comparison NAAQS Comparison Site type(s) General/ Background General/ Background General/ Background Monitor type(s) SLAMS SLAMS SLAMS Network Affiliation N/A N/A N/A Instrument manufacturer and model A PI 400E A PI T200U MetOne BAM
1020 Method code 087 599 122 FRM/FEM/ARM/other FEM FRM FEM Collecting Agency SLOCAPCD SLOCAPCD SLOCAPCD Analytical Lab (i.e. weigh lab, toxics lab, other) N/A N/A N/A Reporting Agency SLOCAPCD SLOCAPCD SLOCAPCD Spatial scale (e.g. micro, neighborhood) Regional Regional Regional Monitoring start date (MM/DD/YYYY) 11/01/1998 11/01/1998 05/16/2010 Current sampling frequency (e.g. 1:3, continuous) continuous continuous continuous

Calculated sampling frequency (e.g. 1:3/1:1) continuous continuous continuous Sampling season (MM/DD-MM/DD) 01/01-12/31 01/01-12/31 01/01-12/31 Probe height (meters) 4.0 4.0 4.7 Distance from supporting structure (meters) 1.0 1.0 1.7 Distance from obstructions on roof (meters) N/A N/A N/A Distance from obstructions not on roof (meters) N/A N/A N/A

Distance from trees (meters) N/A N/A N/A Distance to furnace or incinerator flue (meters) N/A N/A N/A

Distance between monitors fulfilling a QA Collocation requirement (meters) N/A N/A N/A

For low volume PM instruments, is any PM instrument within 1 m of the instrument? N/A N/A No37 Local site name Nipomo Regional Park (NRP) For high volume PM instruments, is any PM instrument within 2m of the instrument? N/A N/A N/A

Unrestricted airflow (degrees) 360 360 360 Probe material for reactive gases (e.g. Pyrex, stainless steel, Teflon) Teflon Teflon N/A

Residence time for reactive gases (seconds) 7.4 8.4 N/A Will there be changes within the next 18 months? No No No

Is it suitable for comparison against the annual PM2.5? N/A N/A N/A

Frequency of flow rate verification for manual PM samplers N/A N/A N/A

Frequency of flow rate verification for automated PM analyzers N/A N/A bi-weekly

Frequency of one-point QC check for gaseous
instruments daily daily N/A

Date of 2014 Annual Performance Evaluation for gaseous parameters 05/20/2014 05/20/2014 N/A

Dates of 2014 Semi-Annual Flow Rate Audits for PM monitors N/A N/A 5/20/2014
10/30/201438 Local site name A tascadero (original site) AQS ID 06-079-8001 GPS coordinates (decimal degrees) 35.49153, -120.66799 Street Address 6005 Lewis Ave., Atascadero, CA County San Luis Obispo Distance to roadways (meters) 62 to Traffic Way
68 to Lewis Ave.
400 to US 101
500 to CA 41 Traffic count (AADT, year) Traffic Way: < 7,400 (2014) a Lewis Ave.: < 2,500 (2014) a US 101: 58,600 (2013) CA 41: 10,400 (2013) Groundcover (e.g. asphalt, dirt, sand) A sphalt Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC O 3 , 1 NO 2 , 1 PM 2.5 , 3 PM 10 , 3 Primary / QA Collocated / Other N/A Primary Primary Primary Parameter code 44201 42602 88101 81102 Basic monitoring objective(s) NAAQS Comparison NAAQS Comparison NAAQS Comparison NAAQS Comparison Site type(s) Population Exposure, Max Concentration Population Exposure, Max Concentration Population Exposure Population Exposure

Monitor type(s) SLAMS SLAMS SLAMS SLAMS Network Affiliation N/A N/A N/A N/A Instrument manufacturer and model A PI T400 A PI T200 MetOne BAM
1020 MetOne BAM
1020 Method code 087 099 170 122 FRM/FEM/ARM/other FEM FRM FEM FEM Collecting Agency SLOCAPCD SLOCAPCD SLOCAPCD SLOCAPCD Analytical Lab (i.e. weigh lab, toxics lab, other) N/A N/A N/A N/A Reporting Agency SLOCAPCD SLOCAPCD SLOCAPCD SLOCAPCD Spatial scale (e.g. micro, neighborhood) Neighborhood Neighborhood Neighborhood Neighborhood Monitoring start date (MM/DD/YYYY) 10/01/1988 08/01/1990 06/01/2009 09/07/2010 Current sampling frequency (e.g. 1:3, continuous) continuous continuous continuous continuous

Calculated sampling frequency (e.g. 1:3/1:1) continuous continuous continuous continuous Sampling season (MM/DD-MM/DD) 01/01-12/31 01/01-12/31 01/01-12/31 01/01-12/31 Probe height (meters) 5.0 5.0 5.8 5.3 Distance from supporting structure (meters) 1.4 1.4 2.2 1.7 Distance from obstructions on roof (meters) N/A N/A N/A N/A Distance from obstructions not on roof (meters) N/A N/A N/A N/A

Distance from trees (meters) N/A N/A N/A N/A Distance to furnace or incinerator flue N/A N/A N/A N/A39 Local site name A tascadero (original site) (meters) Distance between monitors fulfilling a QA Collocation requirement (meters) N/A N/A N/A N/A

For low volume PM instruments, is any PM instrument within 1 m of the instrument? N/A N/A N/A No

For high volume PM instruments, is any PM instrument within 2m of the instrument? N/A N/A N/A N/A

Unrestricted airflow (degrees) 360 360 360 360 Probe material for reactive gases (e.g. Pyrex, stainless steel, Teflon) Teflon Teflon N/A N/A

Residence time for reactive gases (seconds) 9.5 8.1 N/A N/A Will there be changes within the next 18 months? No No No No

Is it suitable for comparison against the annual PM2.5? N/A N/A Y es N/A

Frequency of flow rate verification for manual PM samplers N/A N/A N/A N/A

Frequency of flow rate verification for automated PM analyzers N/A N/A bi-weekly bi-weekly

Frequency of one-point QC check for gaseous
instruments daily daily N/A N/A

Date of 2014 Annual Performance Evaluation for gaseous parameters 05/20/2014 05/20/2014 N/A N/A

Dates of 2014 Semi-Annual Flow Rate Audits for PM monitors N/A N/A 5/20/2014
10/30/2014 5/20/2014
10/30/2014

a Traffic counts were conducted on ly during peak morning and afte rnoon hours along these streets. Along this stretch of Traffic Way, a total of 1,233 vehicles were counted during these four hours, therefore six times this figure (7,398) represents the likely maxi mum AADT. Likewise, the vehicle count along Lewis Ave. during the four peak comm ute hours was 415, so 2,490 represents the likely
maximum AADT.40 Local site name A tascadero (new site) AQS ID 06-079-8002 GPS coordinates (decimal degrees) 35.49453, -120.66617 Street Address 5599 Traffic Way, Atascadero, CA County San Luis Obispo Distance to roadways (meters) 163 to Traffic Way
770 to US 101
330 to CA 41 Traffic count (AADT, year) Traffic Way: < 7,400 (2014) a US 101: 58,600 (2013) CA 41: 10,400 (2013) Groundcover (e.g. asphalt, dirt, sand) V egetative Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC O 3 , 1 NO 2 , 1 PM 2.5 , 3 PM 10 , 3 Primary / QA Collocated / Other N/A Primary Primary Primary Parameter code 44201 42602 88101 81102 Basic monitoring objective(s) NAAQS Comparison NAAQS Comparison NAAQS Comparison NAAQS Comparison Site type(s) Population Exposure, Max Concentration Population Exposure, Max Concentration Population Exposure Population Exposure

Monitor type(s) SLAMS SLAMS SLAMS SLAMS Network Affiliation N/A N/A N/A N/A Instrument manufacturer and model A PI T400 A PI T200 MetOne BAM
1020 MetOne BAM
1020 Method code 087 099 170 122 FRM/FEM/ARM/other FEM FRM FEM FEM Collecting Agency SLOCAPCD SLOCAPCD SLOCAPCD SLOCAPCD Analytical Lab (i.e. weigh lab, toxics lab, other) N/A N/A N/A N/A Reporting Agency SLOCAPCD SLOCAPCD SLOCAPCD SLOCAPCD Spatial scale (e.g. micro, neighborhood) Neighborhood Neighborhood Neighborhood Neighborhood Monitoring start date (MM/DD/YYYY) 02/25/2015 02/25/2015 02/25/2015 02/25/2015 Current sampling frequency (e.g. 1:3, continuous) continuous continuous continuous continuous

Calculated sampling frequency (e.g. 1:3/1:1) continuous continuous continuous continuous Sampling season (MM/DD-MM/DD) 01/01-12/31 01/01-12/31 01/01-12/31 01/01-12/31 Probe height (meters) 5.0 5.0 5.8 5.3 Distance from supporting structure (meters) 1.4 1.4 2.2 1.7 Distance from obstructions on roof (meters) N/A N/A N/A N/A Distance from obstructions not on roof (meters) N/A N/A N/A N/A

Distance from trees (meters) N/A N/A N/A N/A Distance to furnace or incinerator flue (meters) N/A N/A N/A N/A

Distance between monitors fulfilling a QA N/A N/A N/A N/A41 Local site name A tascadero (new site) Collocation requirement (meters) For low volume PM instruments, is any PM instrument within 1 m of the instrument? N/A N/A N/A No

For high volume PM instruments, is any PM instrument within 2m of the instrument? N/A N/A N/A N/A

Unrestricted airflow (degrees) 360 360 360 360 Probe material for reactive gases (e.g. Pyrex, stainless steel, Teflon) Teflon Teflon N/A N/A

Residence time for reactive gases (seconds) 9.5 8.1 N/A N/A Will there be changes within the next 18 months? No No No No

Is it suitable for comparison against the annual PM2.5? N/A N/A Y es N/A

Frequency of flow rate verification for manual PM samplers N/A N/A N/A N/A

Frequency of flow rate verification for automated PM analyzers N/A N/A bi-weekly bi-weekly

Frequency of one-point QC check for gaseous
instruments daily daily N/A N/A

Date of 2014 Annual Performance Evaluation for gaseous parameters N/A N/A N/A N/A

Dates of 2014 Semi-Annual Flow Rate Audits for PM monitors N/A N/A N/A N/A

a Traffic counts were conducted only during peak morning and afternoon hours along this street. Along this stretch of Traffic Way, a total of 1,233 vehicles were counted during these four hours, therefore six times this figure (7,398 ) represents the likely maximum AADT.42 Local site name Red Hills AQS ID 06-079-8005 GPS coordinates (decimal degrees) 35.64366, -120.23134 Street Address 3601 Gillis Canyon Rd., Shandon County San Luis Obispo Distance to roadways (meters) 100 to Gillis Canyon Rd. 1740 to Bitterwater Rd. 10,400 to CA 41 Traffic count (AADT, year) Gillis Canyon Rd.: 23 (2008) BItterwater Rd.: 51 (2011) CA 41: 1,470 (2013) Groundcover (e.g. asphalt, dirt, sand) V egetative Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC O 3 , 1 Primary / QA Collocated / Other N/A Parameter code 44201 Basic monitoring object ive(s) NAAQS Comparison Site type(s) Regional Transport, Max Concentration Monitor type(s) SLAMS Network Affiliation N/A Instrument manufacturer and model A PI T400 Method code 087 FRM/FEM/ARM/other FEM Collecting Agency SLOCAPCD Analytical Lab (i.e. weigh lab, toxics lab, other) N/A Reporting Agency SLOCAPCD Spatial scale (e.g. micro, neighborhood) Regional Monitoring start date (MM/DD/YYYY) 07/01/2000 Current sampling frequency (e.g. 1:3, continuous) continuous Calculated sampling frequency (e.g. 1:3/1:1) continuous Sampling season (MM/DD-MM/DD) 01/01-12/31 Probe height (meters) 4.7 Distance from supporting structure (meters) 1.2 Distance from obstructions on roof (meters) N/A Distance from obstructions not on roof (meters) N/A Distance from trees (meters) N/A Distance to furnace or incinerator flue (meters) N/A Distance between monitors fulfilling a QA Collocation requirement (meters) N/A

For low volume PM instruments, is any PM instrument within 1 m of the instrument? N/A

For high volume PM instruments, is any PM instrument within 2m of the instrument? N/A

Unrestricted airflow (degrees) 360 Probe material for reactive gases (e.g. Pyrex, Teflon43 Local site name Red Hills stainless steel, Teflon) Residence time for reactive gases (seconds) 10.1 Will there be changes within the next 18 months? No Is it suitable for comparison against the annual
PM2.5? N/A

Frequency of flow rate verification for manual PM samplers N/A

Frequency of flow rate verification for automated PM analyzers N/A

Frequency of one-point QC check for gaseous
instruments daily

Date of 2014 Annual Performance Evaluation for gaseous parameters 03/11/2014

Dates of 2014 Semi-Annual Flow Rate Audits for PM
monitors N/A44 Local site name Carrizo Plains AQS ID 06-079-8006 GPS coordinates (decimal degrees) 35.35474, -120.04013 Street Address 9640 Carrizo Highway (CA 58), California Valley County San Luis Obispo Distance to roadways (meters) 38 to Carrizo Highway (CA 58) Traffic count (AADT, year) Carrizo Highway (CA 58): 350 (2013) Groundcover (e.g. asphalt, dirt, sand) Paved Representative statistical area name (i.e. MSA, CBSA, other) San Luis Obispo – Paso Robles (MSA) Pollutant, POC O 3 , 1 Primary / QA Collocated / Other N/A Parameter code 44201 Basic monitoring object ive(s) NAAQS Comparison Site type(s) Regional Transport, General Background Monitor type(s) SLAMS Network Affiliation N/A Instrument manufacturer and model A PI 400A Method code 087 FRM/FEM/ARM/other FEM Collecting Agency SLOCAPCD Analytical Lab (i.e. weigh lab, toxics lab, other) N/A Reporting Agency SLOCAPCD Spatial scale (e.g. micro, neighborhood) Regional Monitoring start date (MM/DD/YYYY) 01/01/2006 Current sampling frequency (e.g. 1:3, continuous) continuous Calculated sampling frequency (e.g. 1:3/1:1) continuous Sampling season (MM/DD-MM/DD) 01/01-12/31 Probe height (meters) 4.7 Distance from supporting structure (meters) 1.1 Distance from obstructions on roof (meters) N/A Distance from obstructions not on roof (meters) N/A Distance from trees (meters) N/A Distance to furnace or incinerator flue (meters) N/A Distance between monitors fulfilling a QA Collocation requirement (meters) N/A

For low volume PM instruments, is any PM instrument within 1 m of the instrument? N/A

For high volume PM instruments, is any PM instrument within 2m of the instrument? N/A

Unrestricted airflow (degrees) 360 Probe material for reactive gases (e.g. Pyrex, stainless steel, Teflon) Teflon

Residence time for reactive gases (seconds) 15.745 Local site name Carrizo Plains Will there be changes within the next 18 months? No Is it suitable for comparison against the annual
PM2.5? N/A

Frequency of flow rate verification for manual PM samplers N/A

Frequency of flow rate verification for automated PM analyzers N/A

Frequency of one-point QC check for gaseous
instruments daily

Date of 2014 Annual Performance Evaluation for gaseous parameters 03/11/2014

Dates of 2014 Semi-Annual Flow Rate Audits for PM
monitors N/A46 

## Appendix D: EPA Approval Atascadero Site Move
This Appendix documents EPA’s a pproval the relocation of the Atascadero SLAMS from 6005 Lewis Avenue to 5599 Traffic Way. Figure D-1 is the ema il from Karl Tupper (SLOCAPCD) to Dena Vallano (EPA Region 9) requesting approval of the new site . Figure D-2 is the reply email from Dena Vallano granting approval. Email addresses and phone numbers have been redacted in these figures. Figure D-3 depicts the PowerPoint presentation referred to in the emails; a larger format version is available from the District upon request.

Figure D-1: Email from Karl Tupper, SLOCAPCD, to De na Vallano, EPA Region 9, requesting approval of new location for the Atascadero SLAMS.47 Figure D-2: Reply email from Dena Vall ano to Karl Tupper granting approval.48 Figure D-3: PowerPoint presentation referred to in Figures D-1 and D-2.49 

## Appendix E: Parallel Monitoring in Atascadero

Introduction
As noted earlier, in 2014 we were notified by the host of our Atascadero SLAMS that we needed to remove the station from their property (6005 Lewis Ave) in order to accommodate planned renovations and new construction. A potential new lo cation was identified about 400 meters away at 5599 Traffic Way, and a limited period of parallel monitoring was conducted at the original and potential sites to assess their comparability; ultima tely the proposed site was chosen as the new
location for the Atascadero SLAM S. Due to the timing of obtain ing the needed equipment, getting site access, and the need to vacate the original si te, parallel monitoring could only be conducted for limited time, specifically Decembe r 18, 2014 to February 23, 2015. Furthermore, due to equipment limitations, only ozone and PM 2.5 could be monitored at the proposed site. All data collected at these sites is available upon request.



### Methods

All instruments at the Lewis Ave site were housed within an insulated tr ailer; see the table in Appendix C for site 06-079-8001 for probe heights an d other siting details. The trailer was equipped with a wall mounted air conditioning unit for c limate control. Hourly room temperature was
maintained between 20 and 30 o C for the duration of the collocation period. At the Traffic Way site, the equipment was housed within a temporary en closure measuring approximately 140 cm tall by 70 cm wide and 70 cm deep. The PM 2.5 probe was approximately 2.5 m above the ground and the ozone probe was at about 3 m; their inlets were le ss than 1 m apart. The enclosure was fitted with a small heater and two cooling fans, each controlled by its own thermostat. Most of the time, hourly
average room temperature was maintained between 20 and 30 o C, however 11 hours had average room temperatures between 30 and 33 o C and 226 hours had average room temperatures between
16 and 20 o C. No data was invalidated based on shelter temperature, since it was always within the operating range of the instruments.

At both locations ozone was monitored with Tele dyne-API T400 photometric ozone analyzers. The Lewis Ave site monitor was operated in accordance with a ll QA/QC requirements in Appendix A of 40 CFR 58. Nightly zero/span/precis ion checks during the parallel mo nitoring period yielded zero responses between 0 and 1.2 ppb, and precision erro rs between -1.2 and +1 .6%; precision checks were carried out at approximately 62 ppb. In cont rast, calibration equipment was not available for the Traffic Way site, so nightly zero/span/precision ch ecks could not be performe d. An initial start-up and a final shut-down calibration check were pe rformed in the SLOCAPCD lab, and both gave passing results, with zero responses of 0 (start -up) and 0.4 (shut-down) and precision errors of +0.1% (start-up) and +0.9% (shut-down). The precision point for th ese calibrations was approximately 50 ppb.

At both locations, PM 2.5 was monitored using MetOne BAM 1020 instruments. While the Lewis Ave monitor was run as an FEM operated in accorda nce with all Appendix A QA/QC requirements, the Traffic Way monitor employed an SCC rather than a VSCC as the PM 2.5 size selector. Bi-weekly QC50 checks—consisting of leak checks, flow audits, te mperature and pressure se nsor checks, and time checks—were performed on both in struments, and both were subj ect to the same cleaning and preventative maintenance schedule . A 72-hr zero test was performe d on the Traffic Way instrument prior to deployment.



### Analysis SLOCAPCD is not aware of any EPA requirements or guidelines for para llel monitoring; however ARB’s Air Monitoring Technical Advisory Co mmittee (AMTAC) publishe d guidelines in 1997. 8 Our analysis of the data is therefore informed by the AMTAC guidelines.

Timing of Parallel Monitoring AMTAC recommends a year of paralle l monitoring or at least monitoring during the season of highest expected concentration. A full year was not pr actical in this situation, and data was instead collected from December 18 through February 23. This period coincides with the season of highest expected PM 2.5 concentration, which is December/Janua ry as shown below in Figure E-1. Unfortunately, ozone concentrations are typically at their lowest during this time of year, as shown in Figure E-2.

8 Air Monitoring Technical Advisory Committee, “Sit e Relocation and Parallel Monitoring Guidelines,” June 11, 1997.51 Figure E-1: Monthly Average PM 2.5 at Atascadero (Lewis Ave) as measured by BAM. 

# Monthly Average PM2.5PM2.5, ug/m3JanFebMarAprMayJunJulAugSepOctNovDec0 4 8 12 16 20 

## 2014 2013 2012 2011 201052 Figure E-2: Daily 8-hr Maximum Ozone by Month and Ye ar at Atascadero (Lewis Ave). Solid lines connect the median values for each month; dotted lines connect the maximum va lues for each month.

PM 2.5 Analysis The analysis of PM 2.5 was conducted using 24-hr averages. Only hours when both monitors had valid data were included in the averaging, and at leas t 18 valid hourly values were required for a 24-hr average to be valid. A scatterplot of these daily aver ages is shown in Figure E-3 along with the least squares fit. The R 2 of the least square fit is 0.95, suggesting that the relationship between the sites is linear. The slope and intercept are 1.011 (95% co nfidence interval: 0.956, 1.067) and -0.41  g/m 3
(95% CI: -1.109, 0.271). Since the confidence interval of the slope contains 1 and that of intercept contains 0, the difference between the si tes is not statistically significant.

The AMTAC guideline suggests performing a paired T-te st to compare the values from the sites. This test essentially asks whether the average difference is significantly different from zero. For these data, the p-value of the test is 0.08 and 95% confiden ce interval for the difference in 24-hr averages between the sites is -0.04 to 0.62 g/m 3 . This also suggests that there is not a statistically significant
difference between the locations.

Finally, the 90% upper bound coefficient of variat ion (C.V.) between the two sites was calculated according to the formulae in section 4.4 of A ppendix A to 40 CFR 58. Daily averages less than 

# Daily 8-hr Max Ozone by Month 1990-2014ozone, ppbJanFebMarAprMayJunJulAugSepOctNovDec0 20 40 60 80 100 Median Maximu m

2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 199053 3  g/m 3 were excluded from the calculation. By this method, the C.V. is calculated to be 11%.
SLOCAPCD considers this result to be evidence fo r comparability, given that the Appendix A goal for
collocated monitors is 10% or less, and these monitors were not collocated, had different probe heights, and employed slightly different methods (VSCC vs SCC).

Figure E-3: Comparison of 24-hr PM 2.5 averages. 

## 0 10 20 300 5 10 15 20 25 30 35 

# Daily PM2.5

December 18, 2014 to February 23, 2015

Lewis Ave (original site); ug/m3Traffic Way (new site); ug/m3 

## 24-hr average R2 : 0.95 m : 1.01 b : -0.42 C.V.: 11 %

1:1 line54 Ozone Analysis The analysis of ozone was conducted using daily ma ximum 8-hr averages. Only hours in which both
sites had valid data were allowed to be included in 8-hr averages. Fo r an 8-hr average to be valid, it had to comprise six or more valid hourly values. The window of the daily maximum 8-hr average at one site was not required to correspond with the window at the other site.

A scatterplot of daily 8-hr maxima is shown in Figure E-4 along with the least squares fit. The R 2 of the least square fit is 0.99, indicating an excelle nt linear fit. The slope and intercept are 1.004 (95% CI: 0.979, 1.067) and -0.53 ppb (95% CI: -1.233, 0.170). Since the confidence interval of the slope contains 1 and that of intercept contains 0, the difference between the sites is not statistically significant.

Applying the T-test suggested by AM TAC results in a p-value of 1.13 × 10 -6 and a 95% confidence interval for the difference in daily maxima of 0.27 to 0.59 ppb. This suggests that there is small but statistically significant difference between the locations, with the Tr affic Way site measuring slightly lower values. This difference could easily be due to the slightly different instrument calibrations noted above. Applying the C.V. test yields a diff erence of 2%, which we in terpret as evidence for comparability.

Finally, Figure E-5 depicts a typical “strip chart,” comparing the ozone values recorded at each site minute by minute. The sites track each other closely, suggesting comparability.



### Conclusion

PM 2.5 was monitored at both locations during the season that historically has had the highest concentrations. Various statistical tests were app lied to the 24-hr averages from these sites, and none indicated a statistically significant difference . The upper bound coefficient of variation between the monitors was only slightly higher than the data quality ob jective for collocated monitors;
however these monitors we re not collocated. In summary, the da ta, while limited, suggest that there is not a significant difference in the PM 2.5 levels measured at these sites.

Ozone was also monitored at these locations, but it was monitored during the time of year that historically has been the low season. Statistical tests comparing the daily 8-hr maxima from these sites found either no significant difference or only a very small—less than 1 ppb—difference
between the locations. This small di fference is likely due to differen ces in instrument calibration. In summary, these limited data suggest that oz one measurements at these locations are representative of the same area.55 Figure E-4: Comparison of Daily Maximum 8-hr Averages. 

## 0 10 20 30 40 500 10 20 30 40 50 

# Daily Max 8-hr Ozone

December 18, 2014 to February 23, 2015

Lewis Ave (original site); ppbTraffic Way (new site); ppb 

## Daily Max 8-hr R2: 0.99 m : 1 b : -0.53 C.V.: 2 %

1:1 line56 Figure E-5: A typical strip chart, comparing ozon e values at the two sites at 1-minute resolution.0 10 20 30 40 50 

# Date: 2015-01-23

HourOzone (ppb)01234567891011121314151617181920212223 

## Traffic Way (new site) Lewis Ave (original site)57 

## Appendix F: Index to Items in Annual Monitoring Plan Checklist
This appendix is intended to pr ovide a convenient guide for where to find the content specifically required by EPA Region 9’s Annual Monitoring Plan Checklist for 2015. The item numbers correspond to those on the checklist.

Item No. Section, page Notes General Plan Requirements 1 Submittal letter 2 Submittal letter; Introduction, p. 4. 3 Non-SLAMS Monitoring..., p. 17. 4 Open, Closed, and Relocated...., p. 8; Appendix C, pp. 40-41; Appendix D. 5 Appendix D. 6 Proposed Network Changes..., p. 16. 7 Proposed Network Changes..., p. 16. 8 Proposed Network Changes..., p. 16. 9 Nitrogen Dioxide Monitoring..., p. 13. 10 Air Quality Data, p. 18. 11 Air Quality Data, p. 18.
12 N/A
13 N/A 14 SLAMS Air Monitoring..., p 7. General Particulate Mo nitoring Requirements
15 N/A
16 N/A 17 Appendix C 18 Appendix C
PM 2.5 -Specific Monitoring Requirements 19 Statement Regarding Review..., p. 16.
20 N/A 21 Appendix A, p. 20. 22 Appendix A, p. 20. 23 Appendix B, p. 24.
24 N/A 25 Appendix C, pp. 25-45. 26 Particular Monitoring..., pp. 14-15. 27 Particular Monitoring..., pp. 14-15; Appendix C, pp. 32-33. 28 Proposed Network Changes..., p. 16.
29 N/A
30 N/A 31 Appendix C, pp. 25-45.
32 N/A 33 Appendix C, pp. 25-45.58 34 Appendix C, pp. 25-45.
PM 10 -Specific Monitoring Requirements 35 Appendix A, p. 21.
36 N/A 37 Appendix C.
38 N/A 39 Appendix C. 40 Appendix C. Pb-Specific Monitoring Requirements 41 Appendix A, p. 23. 42 Appendix A, p. 23.
43 N/A
44 N/A
45 N/A
46 N/A
47 N/A
48 N/A General Gaseous Monitoring Requirements 49 Appendix C. 50 Appendix C.
O 3 -Specific Monitoring Requirements 51 Appendix A, p. 19. 52 Table 2, p.7; Ozone Monitoring..., pp. 11-12. Appendix C. 53 Appendix C.
NO 2 -Specific Monitoring Requirements 54 Proposed Network Changes..., p. 16. 55 Proposed Network Changes..., p. 16.
56 N/A 57 Appendix A, p. 21.
58 N/A CO-Specific Monitoring Requirements 59 Proposed Network Changes..., p. 16.
SO 2 -Specific Monitoring Requirements 60 Appendix A, p. 22. NCORE-Specific Monitoring Requirements
61 N/A Site or Monitor - Specific Requirements 62-85 Appendix C.