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AQ_AM_20230629_BP_AnnPln_Final 2023-2024 Appendix C Forsyth CountyPage -1- May 25, 2023 Katy R. Lusky, Chief Air Data and Analysis Section Air Analysis and Support Branch/Air and Radiation Division U.S. Environmental Protection Agency – Region 4 61 Forsyth Street, SW Atlanta, GA 30303 Dear Ms. Lusky: This letter and accompanying Annual Network Plan report on the status of the Ambient Air Monitoring commitments for the FY-23 105 Grant Work plan for Forsyth County, North Carolina (Reporting Organization 37-067). The entire Plan follows the Executive Summary, complete with staff field reviews as well as a copy of the published public notice. Sincerely, Jason R. Bodenhamer, Program Manager Analysis and Monitoring Division Forsyth County Office of Environmental Assistance and Protection Enclosures cc: Steve Lyda (FCEAP) Minor Barnette (FCEAP) Ryan Brown (EPA-Region IV) Patrick Butler (NCDAQ) Forsyth County Office of Environmental Assistance and Protection This page intentionally left blank 3 Executive Summary Submit by July 1, 2023 an evaluation to demonstrate the requirements of 40 CFR Part 58.10 (a)(1) (Annual Network Evaluation) have been met. This review was conducted and submitted on May 25, 2023 to allow for the entire 30-day public comment period to take place. Quality Assurance Procedures. This Office has received approval of the Criteria Pollutant QAPP on June 29,2022. Our current QMP was approved on June 18, 2018 and this Office has submitted a new revision for approval on March 21, 2023. We are currently working through the approval process with EPA so it will be in place by June 18, 2023. SOPs are up to date and approved within our network including: SO2, NO2, Ozone, PM 2.5 (Cont. & FRM), PM 10 and Course, Calibrators, Zero Air Supplies, and Data Handling. Categorization of Ambient Monitors and Auxiliary Equipment. The evaluation was completed in May, 2023. We currently have backup equipment for each monitoring device stored in our office in the case of equipment failure. The current emphasis remains on maintenance of the monitoring buildings and consolidation of the network. Capital funds are available in limited quantity and are available for proper planning for future network needs. Notify EPA within 30 days after exceedances/violations of NAAQS. The Forsyth County Office of Environmental Assistance and Protection remained an active participant in the AirNow program. Part of that program ensures that all local and regional exceedances/violations of the NAAQS are submitted to EPA and all others affected in a timely fashion. Comply with Exceptional Events Policy. No situations requiring exceptional event flagging occurred since the last Annual Network Review period. Submit list of urban areas for which AQI is reported. Forsyth County reports the AQI for our part of the Greensboro-Winston-Salem-High Point MSA. AQI statistics are available in local newspapers, on the Office’s web site at http://www.forsyth.cc/EAP/, Real time data (updated hourly) are also available at: http://www.forsyth.cc/EAP/airmonitoringdata.aspx Attend Region 4 QA Meeting & AIRS Conference. The 2023 EPA Region 4 Ambient Monitoring Workshop was held this spring in Chattanooga, TN. All of our division was able to attend, either in person or virtually. The virtual option was an added benefit to our division. Submit air quality forecasts for MSA's >500,000 population to EPA AIRNOW. Forsyth County has been a leader in this area and submits air quality forecasts for multiple pollutants to AIRNOW on a year-round basis. Several presentations on this program have been given at recent EPA National Forecasting and Outreach Conferences. Changes in the SLAMS/NAMS Network There were no changes in our SLAMS network. Data Submittal Criteria All SLAMS and PARS data were submitted to AQS within 90 days of the end of each quarter. AQS data reports were also reviewed after data submittal was completed to verify AQS data was correct. All data was certified by May 1, 2023. 4 National Performance Audit Program All NPAP audits were completed by an EPA contractor and the results were submitted into AQS. Continued-Annual Network Evaluation Forsyth County has continued to review the local monitoring network to account for changes in population, land use, and traffic patterns. OZONE The maximum impact downwind site is operated by the State program in Rockingham County (Bethany School, 37-157-0099). The secondary wind direction is measured by the Union Cross site (37-067-1008). In addition, the Clemmons Middle site (37-067-0030), established in 2005, monitors the southwest sector of Forsyth County. Another ozone monitor at Hattie Avenue (37-067-0022) has operated since 1993. CARBON MONOXIDE We no longer operate a CO monitor. The most recently run microscale Peters Creek site (37-067-0023) was shut down December 31, 2015. SULFUR DIOXIDE/NITROGEN OXIDES Sulfur dioxide levels have been measured at the Hattie Avenue site (37-067-0022) since 1983. Readings are considered to be characteristic of background levels in Forsyth County. On occasion, the site is impacted by plume touchdowns from the Duke Energy Belews Creek Generating Station located approximately 20 miles to the northeast in Stokes County. In compliance with the most recent monitoring data requirements, 5-minute SO2 averaged data from this site is reported along with 1-hour data. Nitrogen oxide levels have been measured at the Hattie Avenue site (37-067-0022) since 1984. Readings represent the neighborhood impact of major transportation related emissions from inter-city and intra-city traffic on Business I-40 and U.S. 52 bisecting Winston-Salem. Both monitors satisfy the most recent monitoring criteria related to the 1-hour SO2 and NO2 standards. PARTICULATE Continuous PM 2.5 (TAPI 640X) concentrations continue to be recorded at the Hattie Avenue site (37- 067-0022) and the Clemmons Middle site (37-067-0030) collects continuous PM 2.5 with a (T640), These readings are representative of a maximum impact particulate site influenced by background emissions and locally generated transportation emissions. FRM STATUS FRM PM2.5 samplers have been established at Hattie Avenue (37-067-0022); 1/3 frequency and the Clemmons Middle site (37-067-0030); 1/6 frequency collocated with FRM samplers (ref meth 145) as part of Forsyth County’s EPA approved PM2.5 monitoring plan. Due to the shutdown of the state lab, RTI is the new lab, which started in July of 2021. CONTINUOUS STATUS A continuous PM2.5 TAPI 640x sampler runs at the Hattie Avenue site. This unit measures PM 2.5, CR, and 10 (STP). The data set from the new 640x continues to indicate a good correlation between the FRM PM2.5 data and 24-hour averages but is slightly higher. An additional PM2.5 (only) TAPI 640 unit is operated at the Clemmons Middle site (37-067-0030). SPECIATION STATUS A speciated PM2.5 monitor (1/6 frequency) began operation on September 22, 2001 and a carbon speciated PM2.5 monitor (1/6 frequency) began operation on February 28, 2007 at Hattie Avenue. Validated data sets have been received from RTI through March 2023. 5 AIR TOXICS A (1/6) day air toxic sampler operated in conjunction with the NCDAQ has been resident at the Hattie Avenue site since 2000. Air toxic data remains under NCDAQ control. This Office does not review or upload this data to AQS. LEAD No lead monitors are currently in place at any sites within Forsyth County. Based on the interpretation of the lead monitoring requirements, recent population data, and recent source emission inventory data, there are no sources that emit more than 700 lbs of lead per year. Therefore, there are no immediate plans for lead monitoring in the County. 6 2023 Annual Monitoring Network Plan Forsyth County Office of Environmental Assistance and Protection ♥ Forsyth County Office of Environmental Assistance and Protection 201 North Chestnut Street, 5th Floor Winston-Salem, NC 27101 Phone 336-703-2440 • Fax 336-727-2777 May 25, 2023 7 CERTIFICATION By the signatures below, the Forsyth County Office of Environmental Assistance and Protection (FCEAP) certifies that the information contained in the 2023 Annual Monitoring Network Plan is complete and accurate at the time of submittal to EPA Region 4. However, due to circumstances that may arise during the sampling year, some network information may change. A notification of change and a request for approval will be submitted to EPA Region 4 at that time. Print Name: Jason R.Bodenhamer Signature:Date: 5/25/23 Program Manager, Analysis and Monitoring Division, FCEAP Print Name: W. Minor Barnette Signature: Date: 5/25/23 Director, FCEAP 8 2023 ANNUAL MONITORING NETWORK PLAN TABLE OF CONTENTS EXECUTIVE SUMMARY 3 CERTIFICATION 7 2019 ANNUAL MONITORING NETWORK PLAN 8 INTRODUCTION 9 SITE DESCRIPTION BACKGROUND INFORMATION AND DEFINITIONS 10 1. Site Description 10 2. Date Established 10 3. Site Approval Status 10 4. Monitoring Objectives 10 5. Monitoring Stations’ Designations 10 SLAMS 11 NAMS 11 SPM 11 NCORE 11 6. Monitoring Methods 11 Particulate Matter 10 microns in size (PM10) 12 Particulate Matter 2.5 microns in size (PM2.5) 12 Particulate Matter 10-2.5 microns in size (PM10-2.5) 12 PM2.5 Speciation sampling and analysis 12 Sulfur Dioxide 12 Ozone 13 Nitrogen Dioxide 13 Air Toxics 13 7. Quality Assurance Status 13 8. Scale of Representativeness 13 9. Data Processing and Reporting 14 Network Summary 15 1. Site Table and Criteria Pollutants Monitored 15 2. Site Map 16 3. Monitoring Methods 17 AIR MONITORING STATION DESCRIPTIONS 18 1. Clemmons Middle School 18 (a) Site Table 18 (b) Site Description and Statement of Purpose 18 (c) Site Photographs 19 2. Hattie Avenue 20 (a) Site Table 20 (b) Description and Statement of Purpose 20 (c) Site Photographs 23 3. Union Cross 24 (a) Site Table 24 (b) Site Description and Statement of Purpose 24 (c) Site Photographs 25 REFERENCES 26 9 INTRODUCTION The Forsyth County Office of Environmental Assistance and Protection’s (FCEAP) monitoring program provides air quality monitoring services in Forsyth County, NC. FCEAP is a state “certified local air pollution program” whose purpose(s) are to improve and maintain ambient air quality and reduce exposure to unhealthful air pollutants. FCEAP has operated an air quality monitoring program since the early 1970’s. The air monitoring services provided by the program are conducted to measure concentrations of criteria air pollutants (NO2, SO2, PM, and O3) in accordance with USEPA regulatory requirements. Measurements are used to assess compliance with National Ambient Air Quality Standards (NAAQS). The NAAQS define air pollutant concentration level thresholds judged necessary to protect the public health and welfare. The FCEAP air monitoring program operates a network of state and local air monitoring stations (SLAMS) in Forsyth County. The current network configuration consists of seven monitoring stations that measure concentrations of criteria air pollutants. In addition to the SLAMS network the county network also includes monitoring for meteorological parameters and visibility conditions. The annual monitoring network plan, as provided for in 40 CFR Part 58.10, Annual Monitoring Network Plan and Periodic Network Assessment must contain the following information for each monitoring station in the network: 1. The Air Quality System (AQS) site identification number for existing stations. 2. The location, including the street address and geographical coordinates, for each monitoring station. 3. The sampling and analysis method used for each measured parameter. 4. The operating schedule for each monitor. 5. Any proposal to remove or move a monitoring station within a period of eighteen months following the plan submittal. 6. The monitoring objective and spatial scale of representativeness for each monitor. 7. The identification of any sites that are suitable and sites that are not suitable for comparison against the annual PM2.5 NAAQS. 8. The Metropolitan Statistical Area (MSA), Core-Based Statistical Area (CBSA), Combined Statistical Area (CSA) or other area represented by the monitor. The following information below replicates the Forsyth County Air Quality ambient air monitoring network plan and continues in the following sections outlined below: II. Site Description Background Information and Definitions: An outline of the designations, parameters, monitoring methods, and the basis for site selection. III. Network Summary: This section presents an overview of the total number of sites and monitors in Forsyth County. Also included is a listing of all proposed changes to the current network. IV. Air Monitoring Station Description: Each air monitoring station is described in detail as per the outline in (II.) above. Modification to the network as determined by an annual review process will be made each year to maintain a current up-to-date network description document. 10 Site Description Background Information and Definitions 1. Site Description Specific information is provided to show the location of the monitoring equipment at the site, if the site is located in a CSA/MSA, the AQS identification number, the GPS coordinates, and evidence that monitors and monitor probes conform to the siting criteria. 2. Date Established The date when each existing monitoring station was established is shown in the description. For those stations, which are proposed, a date is provided when it is expected for the station to be in operation. 3. Site Approval Status Each monitoring station in the existing network has been reviewed with the purpose of determining whether it meets all design criteria for inclusion in the SLAMS network. Stations that do not meet the criteria will either be relocated in a nearby area or, when possible, re-sited at the present location. 4. Monitoring Objectives Per 40 CFR 58 Appendix D, Section 1.1: “The ambient air monitoring networks must be designed to meet three basic monitoring objectives. These basic objectives are listed below. The appearance of any one objective in the order of this list is not based upon a prioritized scheme. Each objective is important and must be considered individually.” The objectives are summarized below: (a) Provide air pollution data to the general public in a timely manner. (b) Support compliance with ambient air quality standards and emissions strategy development. Data from FRM (Federal Reference Method), FEM (Federal Equivalent Method), and ARM (Approved Regional Method) monitors for NAAQS pollutants will be used for comparing an area’s air pollution levels against the NAAQS. (c) Support for air pollution research studies. 5. Monitoring Stations’ Designations Most stations described in the air quality surveillance network are designated as State and Local Air Monitoring Stations (SLAMS). In addition, some of these stations fulfill other requirements, which must be identified. In this description of the network, designations are also made for National Air Monitoring Stations (NAMS), Special Purpose Monitors (SPM), and National Core (community oriented) stations (NCore). The following is the criteria used for each of these designations. 11 SLAMS Requirements for air quality surveillance systems provide for the establishment of a network of monitoring stations designated as State and Local Air Monitoring Stations (SLAMS) that measure ambient air concentrations of those pollutants for which standards have been established. These stations must meet requirements that relate to four major areas: quality assurance, monitoring methodology, sampling interval and siting of instruments and instrument probes. NAMS Within the SLAMS network certain monitors are selected to provide the USEPA with timely data for use in national trends analysis. These NAMS monitors are identified in the summary of network stations. SPM Not all monitors and monitoring stations in the air quality surveillance network are included in the SLAMS network. In order to allow the capability of providing monitoring for various reasons such as: special studies, modeling verification and compliance status, and other objectives; certain monitors are designated as Special Purpose Monitors (SPM). These monitors are not committed to any one location or for any specified time period. They may be located as separate monitoring stations or be included at SLAMS locations. Monitoring data may be reported, provided that the monitors and stations conform to all requirements of the SLAMS network. NCORE National Core (community-oriented) multi-pollutant monitoring station data will be used to evaluate the regional air quality models used in developing emission strategies, and to track trends in air pollution abatement control measures’ impact on improving air quality. 6. Monitoring Methods Sampling and analytical procedures for criteria air pollutant monitoring performed in the FCEAP ambient air monitoring network are conducted in accordance with applicable USEPA Designated Federal Reference (FRM) or Equivalent (FEM) Methods unless otherwise noted. Analytical techniques for non-criteria air pollutant monitoring (methods employed that are not USEPA Designated Federal Reference (FRM) or Equivalent (FEM) Methods) are documented in the applicable FCEAP Quality Assurance Project Plans (QAPP), FCEAP Standard Operating Procedures (SOP), or the appropriate North Carolina Division of Air Quality (NCDAQ) QAPP or SOP. Methods used by FCEAP for criteria pollutant monitoring are listed below: Particulate Matter 10 microns in size (PM10) All PM10 samplers operated by FCEAP are operated as federal reference method (FRM) or equivalent samplers and are operated according to the requirements set forth in 40 CFR 50 and 40 CFR 53. Listed below is the USEPA Designated Reference or Equivalent Method used in the FCEAP monitoring network: Method Designation Number Method Code T640 PM Mass Monitor w/640X Option EQPM-0516-239 239 12 Particulate Matter 2.5 microns in size (PM2.5) With the exception of speciation samplers, all PM2.5 samplers operated by FCEAP are either FRM or FEM samplers. Listed below is the USEPA Designated Reference or Equivalent Method used in the FCEAP monitoring network: Method Designation Number Method Code R & P Partisol-Plus 2025i PM-2.5 Seq. EQPM-0202-145 145 T640 PM Mass Monitor w/640X Option EQPM-0516-238 238 TAPI Model T640 PM Mass Monitor EQPM-0516-236 236 Particulate Matter 10-2.5 microns in size (PM10-2.5) With the exception of speciation samplers all PM2.5 samplers operated by FCEAP are either FRM or FEM samplers. Listed below is the USEPA Designated Reference or Equivalent Method used in the FCEAP monitoring network: Method Designation Number Method Code T640 PM Mass Monitor w/640X Option EQPM-0516-240 240 PM2.5 Speciation sampling and analysis In addition to operating PM2.5 samplers that determine only PM2.5 mass values, FCEAP also operates PM2.5 speciation samplers that collect samples that are analyzed to determine the chemical makeup of PM2.5. Data collected using this method cannot be compared to the NAAQS. Listed below is the method used in the FCEAP monitoring network: Method Designation Number Method Code MetOne SASS URG NA NA NA NA Sulfur Dioxide Instruments used to continuously monitor sulfur dioxide levels in the atmosphere employ the pulsed UV fluorescence method. Listed below is the USEPA Designated Reference or Equivalent Method used in the FCEAP monitoring network: Method Designation Number Method Code Teledyne API T100U EQSA-0495-100 600 Ozone Ozone is monitored using the UV photometry method. Listed below is the USEPA Designated Reference or Equivalent Method used in the FCEAP monitoring network: Method Designation Number Method Code TAPI. Model 400E, T400 EQOA-0992-087 087 13 Nitrogen Dioxide The chemiluminescence method is used in monitoring the nitrogen dioxide level in the ambient air. Listed below is the USEPA Designated Reference or Equivalent Method used in the FCEAP monitoring network: Method Designation Number Method Code TAPI Model 200EU, T200U RFNA-1194-599 599 Air Toxics Air toxics sampling is conducted in Forsyth County using equipment on loan from the State of North Carolina, Division of Air Quality. Due to staffing issues, the State of NC has put the toxics program on hold for a 6-month period. They are planning to update the equipment as well during this time. Listed below is the USEPA Designated Reference or Equivalent Method used in the FCEAP monitoring network: Method Designation Number Method Code Compendium Method for Toxic Organics Compendium Method TO-15 150 7. Quality Assurance Status FCEAP has an extensive quality assurance procedure to ensure that all air monitoring data collected meets established criteria for precision and accuracy. FCEAP operates according to EPA approved Quality Assurance Project Plans (QAPP) and Standard Operating Procedures. Staff members audit instrumentation on a scheduled basis to ensure that each instrument is calibrated and operating properly. Data validation is performed monthly to ensure data reported by each instrument is recorded accurately in the air quality monitoring database. 8. Scale of Representativeness Each station in the monitoring network must be described in terms of the physical dimensions of the air parcel nearest the monitoring station throughout which actual pollutant concentrations are reasonably similar. Area dimensions or scales of representativeness used in the network description are: (a) Microscale - defines the concentration in air volumes associated with area dimensions ranging from several meters up to about 100 meters. (b) Middle scale - defines the concentration typical of areas up to several city blocks in size with dimensions ranging from about 100 meters to 0.5 kilometers. (c) Neighborhood scale – defines concentrations within an extended area of a city that has relatively uniform land use with dimensions ranging from about 0.5 to 4.0 kilometers. (d) Urban scale - defines an overall citywide condition with dimensions on the order of 4 to 50 kilometers. (e) Regional Scale - defines air quality levels over areas having dimensions of 50 to hundreds of kilometers. Closely associated with the area around the monitoring station where pollutant concentrations are reasonably similar are the basic monitoring exposures of the station. There are six basic exposures: (a) Sites located to determine the highest concentrations expected to occur in the area covered by the network. (b) Sites located to determine representative concentrations in areas of high population density. (c) Sites located to determine the impact on ambient pollution levels of significant sources or source categories. (d) Sites located to determine general background concentration levels. 14 (e) Sites located to determine the extent of regional pollutant transport among populated areas; and in support of secondary standards. (f) Sites located to measure air pollution impacts on visibility, vegetation damage, or other welfare-based impacts. The design intent in siting stations is to correctly match the area dimensions represented by the sample of monitored air with the area dimensions most appropriate for the monitoring objective of the station. The following relationship of the six basic objectives and the scales of representativeness are appropriate when siting monitoring stations: Site Type Appropriate Siting Scales 1. Highest concentration Micro, middle, neighborhood (sometimes urban or regional for secondarily formed pollutants). 2. Population oriented Neighborhood, urban. 3. Source impact Micro, middle, neighborhood. 4. General/background & regional transport Urban, regional. 5. Welfare-related impacts Urban, regional. Table 1 - Siting Objectives and Scales 9. Data Processing and Reporting All ambient air quality data are stored on the Achilles Server managed by the Forsyth County MIS (IT) department located on the 3rd floor of the Forsyth County Government Center, FCEAP, 201 N. Chestnut Street, Winston-Salem, North Carolina. The AirVision SQL based database is accessed from computers located on the 5th floor of the Forsyth County Government Center, FCEAP, 201 N. Chestnut Street, Winston-Salem, North Carolina. On a daily basis, All data are backed up and maintained at an off-site location. After all monthly data validation procedures are successfully completed, data is transmitted to the USEPA’s national Air Quality System (AQS) database. The AQS database is maintained by EPA as the official repository of the fully quality assured ambient air quality dataset. 15 Network Summary 1. Site Table and Criteria Pollutants Monitored Site AQS ID # CO NO2 O3 Pb PM2.5 PM10 SO2 Air Toxics Clemmons Middle School 37-067-0030 X X Hattie Avenue A&B 37-067-0022 X X X X X X Union Cross 37-067-1008 X Table 2 - Forsyth County Monitoring Sites 16 2. Site Map AIR QUALITY MONITORING STATIONS FORSYTH COUNTY, NC 2023 Figure 1 - Forsyth County Monitor Locations 3. Monitoring Methods Site Parameter Instrument / Method Method Number Parameter Number Monitor Type† Serial Number Purchase Date Replace Date Condition 37-067-0022 Ozone UV Photometric 087 44201 SLAMS 6414 2017 2027 Good 37-067-0022 SO2 Pulsed UV Fluorescent 600 42401 SLAMS 179 2017 2027 Good 37-067-0022 NO Chemi- luminescence 599 42601 SLAMS T200U-214 2017 2027 Good 37-067-0022 NO2 Chemi- luminescence 599 42602 SLAMS T200U-214 2017 2027 Good 37-067-0022 NOx Chemi- luminescence 599 42603 SLAMS T200U-214 2017 2027 Good 37-067-0022 Air Toxics Compendium Method for Toxic Organics (TO) 15 150 Multiple NON 4518 NCDENR Owned 3603 37-067-0022 PM2.5 FRM 145 88101 SLAMS 2025I203541 302 2014 2024 Good 37-067-0022 PM2.5 Speciation 118 Multiple SLAMS A2591 2001 2024 Good 37-067-0022 PM2.5 T640x 238 88101 SLAMS 96 2017 2027 Good 37-067-0022 PM2.5CR T640x 240 86101 SLAMS 96 2017 2027 Good 37-067-0022 PM2.5 Carbon Speciation 118 88101 SLAMS 3NB0191 2007 2024 Good 37-067-0022 PM10 T640x 239 81102 SLAMS 96 2017 2027 Good 37-067-0030 Ozone UV Photometric 087 44201 SLAMS 3093 2018 2028 Good 37-067-0030 PM2.5 T640 236 88101 SLAMS 145 2017 2027 Good 37-067-0030 PM2.5 FRM 145 88101 SLAMS 2025B21708 0407 2010 2020 Good 37-067-1008 Ozone UV Photometric 087 44201 SLAMS 4060 2018 2028 Good 37-067-1008 Temp Climatronics 020 61101 SLAMS 2016 2026 Good 37-067-1008 Humidity Climatronics 020 61103 SLAMS 2016 2026 Good 37-067-1008 WD Climatronics 020 61104 SLAMS 102779 2016 2026 Good 37-067-1008 WS Climatronics 020 61103 SLAMS 102779 2016 2026 Good 37-067-1008 Pressure Climatronics 011 64101 SLAMS 2016 2026 Good Table 3 - Forsyth County Monitoring Methods †- Monitor Type: SLAMS- State and Local Air Monitoring Station SPM- Special Purpose NON- Non-regulatory TRENDS- Trends Speciation Air Monitoring Station Descriptions 1. Clemmons Middle School (a) Site Table Site Name: Clemmons Middle School AQS Site Id #: 37-067-0030 Location: Fraternity Church Road Winston-Salem, NC Latitude: N 36.026612 Longitude: W 80.341962 Elevation: 245 meters Date Monitor Established: Ozone April 27, 2005 Date Monitor Established: PM2.5 T640 Jan. 1, 2018 Date Monitor Established: PM2.5 FRM Oct 1, 2018 Nearest Road: Fraternity Church Road Distance to Road: 40 meters Traffic Count3: 4400 Year of Count: 2017 MSA4: Winston-Salem, NC Metropolitan Statistical Area MSA #: 49180 Parameter Method Method Number Sampling Schedule Ozone UV Photometric 087 March 1 – Oct. 31, (Continuous) PM2.5 T640 236 Continuous PM2.5 FRM Gravimetric 145 1/6 day Table 4 - Clemmons Middle School Monitoring Station Summary (b) Site Description and Statement of Purpose An ozone monitor and PM2.5 continuous monitor have been located at a manufactured structure since April 27, 2005. The site is located in a mixed use environment at latitude N36.025931º and longitude W80.342257º. The site elevation is 245 meters above sea level. The nearest road is Fraternity Church Road with an annual traffic volume of 4100 vehicles (2017) at a distance of 40 meters from the sample inlet. The inlet of the samplers is approximately 3 meters above ground level and 1 meter above roof level. There were trees encroaching on the minimum distance from the inlet and those trees were removed during the summer of 2015. The last official site evaluation was completed in October 2022. The area is a transition zone of business (~50%) to residential (~50%) within a 1 km radius. The samplers are SLAMS. The ozone instrument is operated during the North Carolina ozone monitoring season which begins March 1 and ends October 31. The ozone instrument operates continuously during this period. 19 OBJECTIVE AND SPATIAL SCALE The monitoring objectives of the instruments are to measure: 1) upwind background ambient concentrations and 2) population exposure. The site is a neighborhood spatial scale for ozone and PM2.5. Data from this site is used to assess compliance with the NAAQS for ozone and PM2.5. The site is located in the Winston-Salem, NC Metropolitan Statistical Area4. The principal cities and counties in the MSA are Winston-Salem, Davie County, Forsyth County, Stokes County, and Yadkin County, NC. (c) Site Photographs NORTH EAST SOUTH WEST 20 2. Hattie Avenue (a) Site Table Site Name: Hattie Avenue (Two buildings {A & B} at one location) AQS Site Id #: 37-067-0022 Location: 1300 Hattie Avenue Winston-Salem, NC Latitude: N 36.110940 Longitude: W 80.224501 Elevation: 284 meters Date Monitor Established: Ozone May 21, 1993 Date Monitor Established: NO2 January 1, 1984 Date Monitor Established SO2 January 1, 1983 Date Monitor Established: PM2.5 – FRM January 1, 1999 Date Monitor Established: PM2.5 - PM10 - PM10-2.5 January 1, 2018 Date Monitor Established: Air Toxics January 1, 2000 Date Monitor Established: Speciation January 1, 2001 Date Monitor Established: Carbon Speciation January 1, 2007 Nearest Road: Hattie Avenue Distance to Road: 27 meters Traffic Count3: 6000 Year of Count: 2017 MSA4: Winston-Salem, NC Metropolitan Statistical Area MSA #: 49180 Parameter Method Method Number Sampling Schedule Ozone UV Photometric 087 March 1 – Oct. 31, (Continuous) NO2 Chemiluminescence 599 Continuous SO2 UV Pulsed Fluorescence 560 Continuous PM2.5 FRM FRM Gravimetric 145 1/3 day PM2.5 PM10 PM10-2.5 T640x, Continuous 238-239-240 Continuous Air Toxics Compendium Method for Toxic Organics (TO) 15 150 1/6 day Speciation MET-one 118 1/6 day Carbon Speciation URG Sampler 118 1/6 day Table 5 - Hattie Avenue "A" Monitoring Station Summary (b) Description and Statement of Purpose The Hattie Avenue A site monitors ozone, sulfur dioxide, oxides of nitrogen, PM2.5, PM10, PM 10- 2.5, toxics, speciation, and carbon speciation. The site is located in the 1300 block of Hattie Avenue in downtown Winston-Salem. The site is located approximately 2.2 km NE of downtown, 1.1 km E of US52 and approximately 1.8 km NNW of Interstate 40 Business in a residential district at latitude N36.110941º and longitude W80.224423º. The site elevation is 284 meters. The nearest road, Hattie Avenue, is 27 meters from the inlets and has a daily traffic flow of 6000 vehicles (2017). The nearest tallest building is St. Benedict’s Church (approximately 10 meters). The inlets are approximately 43 meters from the building. The inlets are approximately 4 meters above the ground and 1 meter above the roof of the monitoring station. The last official 21 site evaluation was completed in October 2022. The area is residential. The ozone, sulfur dioxide, and NO2 monitors are all SLAMS. The ozone instrument is operated during the North Carolina ozone monitoring season which begins March 1 and ends October 31. The ozone instrument operates continuously during this period. The SO2 and NO2 instruments operate continuously. The PM2.5, PM10, and PM10-2.5 T640x instruments operate continuously. The PM2.5 primary monitor is a continuous sampler and the co-located FRM is on the 1 in 3 day schedule. The FRM sampling interval is 24 hours, from midnight to midnight every third day. The PM2.5 Speciation sampling frequency is 1 in 6 days. The sampling interval is 24 hours, from midnight to midnight every six days. Monitoring for Urban Air Toxics (UAT) is currently conducted at this site by the North Carolina Division of Air Quality (NC-DAQ), Toxics Protection Branch (TPB). Currently, the NC-DAQ TPB collects whole air samples in stainless steel 6 liter- pressurized canisters. The samples are then analyzed using cryogenic preconcentration gas chromatography with mass spectrometric detection (GC/MS) via the Compendium Method for Toxic Organics (TO) 15 for the list of 68 compounds (below). • Propene • Freon 12 • Freon 22 • Freon 114 • Chloro Methane • (Methylchloride) • Isobutene • Vinyl chloride • 1,3-Butadiene • Bromomethane • Chloroethane • Freon 11 • Pentane • Ethanol • Isoprene • Acrolein • 1,1-Dichloroethene • (Vinylidene chloride) • Freon 113 • Methyl Iodide • Isopropyl Alcohol • Carbon Disulfide • Acetonitrile • Methylene chloride • Cyclopentane • MTBE • Hexane • Methacrolein • Vinyl Acetate • 1,1-Dichloroethane • Methyl Vinyl Ketone • Methyl Ethyl Ketone • 1,2 Dichloroethene • Chloroform • 1,1,1-Trichloroethane • (Methyl chloroform) • Cyclohexane • Carbon Tetrachloride • Benzene • 1,2-Dichloroethane • (ethylene dichloride) • 1-Butanol • Trichloroethylene • 2-Pentanone • 3-Pentanone • 1,2-Dichloropropane • 1,4-Dioxane • Bromodichloromethane • trans-1,3 Dichloropropene • Methyl Isobutyl Ketone • Toluene • cis-1,3 Dichloropropene • 1,1,2-Trichloroethane (vinyl trichloride) 22 • Ethylpropylketone • Tetrachloroethylene • (perchloroethylene) • Methyl Butyl Ketone • Dibromoethane • Chlorobenzene • (phenylchloride) • Ethylbenzene • m- & p-Xylene • o-Xylene • Styrene • Bromoform • 1,1,2,2-Tetrachloroethane • 1,3,5-Trimethylbenzene • (mesitylene) • 1,2,4-Trimethylbenzene • (pseudocumene) • m-Dichlorobenzene • 1,2,3-Trimethylbenzene • p-Dichlorobenzene • Benzylchloride • o-Dichlorobenzene • 1,2,4-Trichlorobenzene The site complies with the siting requirements of 40CFR58 for criteria air pollutants. It is recommended that the current site status be maintained. OBJECTIVE AND SPATIAL SCALE The monitoring objectives of the instruments are to measure: 1) background ambient concentrations and 2) population exposure. The site is a neighborhood spatial scale. Data from this site is used to assess compliance with the NAAQS for ozone, sulfur dioxide, and nitrogen dioxide. The site is located in the Winston-Salem, NC Metropolitan Statistical Area4. The principal cities and counties in the MSA are Winston-Salem, Davie County, Forsyth County, Stokes County, and Yadkin County, NC. 23 (c) Site Photographs NORTH (unable to update due to locked gate) EAST SOUTH WEST 24 3. Union Cross (a) Site Table Site Name: Union Cross AQS Site Identification Number: 37-067-1008 Location: 3656 Piedmont Memorial Drive Winston-Salem, NC Latitude: N 36.051805 Longitude: W 80.144933 Elevation: 285 meters Date Monitor Established: Ozone April 1, 1998 Nearest Road: Piedmont Memorial Dr. Distance to Road: 55 meters Traffic Count3: 670 Year of Count: 2017 MSA4: Winston-Salem, NC Metropolitan Statistical Area (2006) MSA #: 49180 Parameter Method Method Number Sampling Schedule Ozone UV Photometry 087 March 1 – October 31 (Continuous) Wind Speed Climatronics 020 Continuous Wind Direction Climatronics 020 Continuous Pressure Climatronics 011 Continuous Outdoor Temperature Climatronics 020 Continuous Relative Humidity Climatronics 020 Continuous Table 6 - Union Cross Monitoring Station Summary (b) Site Description and Statement of Purpose An ozone monitor has been located at this site since April 1, 1998 along with a meteorological tower since 1997. The site is located approximately 10 km SE of the central business district at latitude 36.050746° and longitude -80.143826°. The site elevation is 285 meters above sea level. The nearest road is Piedmont Memorial Drive with an annual traffic volume of 670 vehicles (2017) at a distance of 55 meters from the sample inlet. The inlet is approximately 3 meters above the ground and 1 meter from the roof. The last official site evaluation was completed in October 2022. The area is residential. The ozone sampler is SLAMS. The ozone instrument is operated during the North Carolina ozone monitoring season which begins March 1 and ends October 31. The ozone instrument operates continuously during this period. The site complies with the siting requirements of 40CFR58 for criteria air pollutants. There are no proposed changes for this site. It is recommended that the current site status be maintained. All equipment has been moved from the old building (green exterior) to the new building (white exterior). The old building will be moved from this location and disposed of. 25 OBJECTIVE AND SPATIAL SCALE The monitoring objective of the instrument is to measure population exposure. The site is a neighborhood spatial scale for ozone. Data from this site is used to assess compliance with the NAAQS for ozone. The site is located in the Winston-Salem, NC Metropolitan Statistical Area4. The principal cities and counties in the MSA are Winston-Salem, Davie County, Forsyth County, Stokes County, and Yadkin County, NC. (c) Site Photographs NORTH EAST SOUTH WEST 26 References 1. Title 40 Code of Federal Regulations Part 58, Ambient Air Quality Surveillance. Part 58 and Part 58 Amended: Federal Register/Vol. 71 No. 200/Tuesday, October 17, 2006/Rules and Regulations. 2. Watson, John G., Chow, Judith C., DuBois, David, Green, Mark, Frank, Neil, Pitchford, Marc. Guidance for Network Design and Optimum Site Exposure for PM2.5 and PM10. Office of Air Quality Planning and Standards, U. S. Environmental Protection Agency, Research Triangle Park, NC 27711. December 15, 1997. 3. Winston-Salem Department of Transportation. Current Traffic Counts Note: Traffic Count taken from nearest road providing most impact to site 4. US Census Bureau. Current Lists of Metropolitan and Micropolitan Statistical Areas and Definitions. http://www.census.gov/population/metro/data/index.html . (301) 763-2419. 2006. 27 2022 Annual Monitoring Network Plan Appendix A No comments were received.