The Dalles Air Sampling for PAHs Laboratory & Environmental Assessment Program 3150 NW 229th Ave, #150 Hillsboro, OR 97124 Phone: 503-693-5700 Fax: 503-693-4999 Contact: Lori PIllsbury www.oregon.gov/DEQ DEQ is a leader in restoring, maintaining and enhancing the quality of Oregon’s air, land and water. Documents can be provided upon request in an alternate format for individuals with disabilities or in a language other than English for people with limited English skills. To request a document in another format or language, call DEQ in Portland at 503-229-5696, or toll-free in Oregon at 1-800-452-4011, ext. 5696; or email deqinfo@deq.state.or.us. State of Oregon Department of Environmental Quality The Dalles Air Sampling for PAHs Revision date: 03/03/2017 Starting in June 2016, DEQ deployed three monitors to collect air samples in the vicinity of AmeriTies West, LLC in The Dalles, Oregon. Samples were analyzed for polycyclic aromatic hydrocarbons (PAHs) likely associated with tie treatment processes. This report is a summary of the monitoring results including analysis of corresponding AmeriTies production data, wind data, and public complaint information. In general monitoring results indicated the presence of naphthalene and other PAHs in the air in the area monitored. At times these chemicals were present at levels of concern. Given that the highest levels were detected at the Wasco County Building location, the source of these PAHs is likely the AmeriTies facility. Key Findings         Both naphthalene and total PAH concentrations were found above their respective lifetime annual average benchmarks. The Agency for Toxic Substances and Disease Registry (ATSDR) in conjunction with the Oregon Health Authority (OHA) will be completing an in-depth public health consultation to determine whether long-term air exposures are harmful to the community. Naphthalene concentrations were found below its respective 24 hour health screening level set by OHA. Samples from the Wasco County Building location were consistently higher, in both naphthalene and total PAHs than the other locations. Samples from the Cherry Heights location were consistently lowest in all compounds. Sampling included days when complaints were logged with DEQ. AmeriTies production levels (average, minimum and maximum) on sample and non-sample days were similar. Overall tie production levels were not significantly different on sample days versus non-sample days, and there was no obvious correlation between the number of complaints and the volume of tie production. Total PAH concentrations correlate to daily temperature. Concentrations decrease as daily maximum temperatures decrease. Background On February 1, 2015, the DEQ’s Nuisance Strategy was triggered due to the number and description of odor complaints DEQ received concerning AmeriTies West, LLC. As a result, DEQ staff conducted odor surveys in The Dalles, OR and documented that creosote-type odors are often present in the community. DEQ also collected air samples to determine the levels of polycyclic aromatic hydrocarbons (PAHs) east of city center in response to odor and air quality concerns related to tie treatment plant operations associated with AmeriTies West, LLC. The sampling objective was to determine if emissions associated with the tie treatment plant facility are present above human health risk-based concentrations or, in the case where risk-based concentrations are below naturally occurring background concentrations, if emissions exceed background levels. Air Sampling Starting in June 2016, DEQ staff deployed three polyurethane foam samplers (PUFs) to collect air samples in the vicinity of AmeriTies West, LLC. Samples were analyzed for PAHs likely associated with Page 1 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 tie treatment plant facilities. DEQ also collected wind speed and direction data in the area to help identify the potential source of any pollutants. Data from this project may also be used to estimate the area of distribution of air emissions from the facility(s). Oregon Health Authority (OHA) and the Agency for Toxic Substances and Disease Registry (ATSDR) will utilize the data generated from this project as part of an OHA and ATSDR Health Consultation. The study boundaries for this sampling were determined using the wind speed and direction from the Columbia Gorge Airport, the known emission points for PAHs from AmeriTies West, LLC, and complaint location information. Monitoring locations were selected based on consultation with managers, air quality modelers and air monitoring specialists, permission from land and business owners and distance from the facility. Polycyclic Aromatic Hydrocarbons (PAHs) PAHs are a class of over 100 different chemicals that occur naturally in coal, crude oil and gasoline, however they can also be produced during the incomplete combustion of coal, oil, gas, wood, garbage and other organic substances like tobacco and charbroiled meat. Among other chemical compounds, PAHs are found in creosote which has long been used as a wood preservative to protect railroad ties, utility poles, and other products from environmental and biological degradation. Generally, PAHs do not pose health risks in the short term unless extremely high concentrations are observed, but many of them can increase lifetime cancer risk with prolonged exposure. Exposure to PAHs can occur by breathing contaminated air from sources such as vehicle exhaust, cigarette smoke, wood smoke and wildfires or fumes from asphalt roads. Oregon air toxics lifetime annual benchmarks are based on concentration levels that would result in a cancer risk of one-in-a-million based on a lifetime of exposure. For non-carcinogens, the benchmarks are levels a person could breathe for a lifetime without any cancer related health effects. The lifetime annual ambient benchmark concentrations for 52 air toxics of concern in Oregon are based on consensus recommendations from the Air Toxics Scientific Advisory Committee, a panel of experts that provides advice on the state air toxics program that is scientifically and technically sound, independent and balanced. The benchmarks are based on concentration levels that are protective of our most sensitive individuals. These benchmarks provide consistent health-based goals, as DEQ develops strategies to reduce air toxics. Analysis Initially, three monitoring stations were set up to measure air quality and meteorological data: Cherry Heights (4 km from AmeriTies), City Park (0.9 km), and Wasco County Building (0.6 km). All three stations collected one 24 hour air quality sample every three days from June 2, 2016 through August 1, 2016. In order to adequately assess air contaminants throughout The Dalles, the decision was made to move the City Park monitor to two additional locations, east and west of City Park. On August 4, 2016, this sensor was moved to Old Dufur Road (0.75 km) where it collected samples from August 4, 2016 through September 6, 2016. On September 24, 2016, the monitor was relocated from Old Dufur Road to Clark Street (1.5 km). The monitor began collecting data on September 24 and continued through November 18. Samples were continually collected at the Cherry Heights and Wasco County Building locations until November 19. Samplers were scheduled to collect a sample every three days, however equipment maintenance, holidays and logistical factors led to occasional diversions from the regular sampling schedule. Page 2 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Naphthalene DEQ analyzed samples for 21 PAHs commonly associated with tie treatment facilities. Of these, naphthalene is the only individual compound with a specific established DEQ benchmark. Figures 1, 2 and 3 show the concentration of naphthalene recorded at each station during the sampling period compared to the State of Oregon 24-hr health screening level of 200 µg/m 3 at standard temperature and pressure (STP). Concentrations above the ambient benchmark concentration (0.03 µg/m3) were detected in individual samples at each of the five monitoring locations during the sampling period, however no samples showed concentrations that were close to the 24-hr health screening level (200 µg/m3). The lowest average concentrations occurred at the Cherry Heights location, while the highest average concentration occurred at the Wasco County Building location. The concentrations detected at the Wasco County Building location were significantly higher than the concentrations detected at all other monitoring locations. Concentrations at the Old Dufur Road monitoring location were also significantly higher than those detected at the Cherry Heights location. A table with all the PAH sampling results is provided in Appendix A. 24-hr Health Screening Level (200 µg/m3) Figure 1. Naphthalene concentration (µg/m 3 STP) from June 2-August 1, 2016. Monitoring locations are represented by the vertical bars. The yellow line indicates the DEQ 24-hr health screening level for naphthalene (200 µg/m3 STP). A break ( ≈ ) in the y-axis was included to show the maximum values at the Wasco County Building location on the same chart as the other monitoring locations. This figure depicts the monitoring timeframe for the sampling at City Park. Page 3 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 24-hr Health Screening Level (200 µg/m3) Figure 2. Naphthalene concentration (µg/m 3 STP) from August 4-September 21, 2016. Monitoring locations are represented by the vertical bars. The yellow line indicates the DEQ 24-hr health screening level for naphthalene (200 µg/m3 STP). A break ( ≈ ) in the yaxis was included to show the maximum values at the Wasco County Building location on the same chart as the other monitoring locations. This figure depicts the monitoring timeframe for the sampling at Old Dufur Road. Page 4 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 24-hr Health Screening Level (200 µg/m3) Figure 3. Naphthalene concentration (µg/m 3 STP) from September 24-November 19, 2016. Monitoring locations are represented by the vertical bars. The Clark St. sampling data includes data from a temporary sampling location that recorded two readings in September before being moved to a more suitable location in October. The yellow line indicates the DEQ 24-hr health screening level for naphthalene (200 µg/m3 STP). A break ( ≈ ) in the y-axis was included to show the maximum values at the Wasco County Building location on the same chart as the other monitoring locations. This figure depicts the monitoring timeframe for the sampling at Clark Street. These differences can also be seen in Table 1 which contains the minimum, maximum, average and standard deviation of naphthalene concentrations detected at each of the monitoring locations as well as a measure of lifetime exposure. This measure indicates that while the Cherry Heights location had the lowest average concentration of the monitoring locations, it was still more than twice the benchmark while the average concentration at the Wasco County Building location was nearly 80 times above the DEQ benchmark. Table 1. Concentration of naphthalene samples (µg/m³ STP) per monitoring location over the sampling period (June 2-November 19, 2016). One sample was comprised of concentration levels measured over a 24-hour period. Impact factor indicates the ratio of average naphthalene detected to the benchmark. An impact factor of one means that the average detection was equal to the benchmark. Lifetime annual average benchmark = 0.03 µg/m³ STP. All units in µg/m3 Minimum Detected Amount Maximum Detected Amount Average1 Standard Deviation1 Impact Factor Cherry Heights 0.00609 0.414 0.0639 0.0705 2.13 City Park 0.031 1.71 0.465 0.469 15.5 Clark St. 0.0798 1.11 0.599 0.368 20.0 Old Dufur Rd. 0.576 1.95 1.035 0.426 34.5 Wasco County Bldg. 0.304 5.78 2.373 1.448 79.1 1 Calculated using ProUCL 5, Kaplan Meier Method with non-detects Page 5 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Concentration of PAHs using Toxicity Equivalent Factors Each individual compound within the PAH category varies in toxicity therefore it is helpful to compare the toxicity of individual compounds to the toxicity of one of the most toxic compounds in the PAH category, benzo(a)pyrene. This is done using a toxicity equivalent factor (TEF). Each of the less toxic PAH compounds are then given a TEF value between 0 and 1 that indicates the toxicity of that compound relative to benzo(a)pyrene, which is assigned a TEF value of 1. While most of the individual PAH compounds do not have individual benchmarks, DEQ does have an established benchmark for the total concentration of PAHs using TEF values in order to quantitatively assess the risk of PAHs. In order to calculate the total PAH concentration using TEFs, the concentration of each compound is multiplied by its own TEF value to yield a new adjusted concentration. Then each of these adjusted concentrations are added together and compared to the lifetime annual average benchmark of 0.0009 µg/m3. Figures 4 through 6 show the total concentration of PAHs using TEFs per day. Naphthalene is the only individual PAH compound with its own established benchmark, therefore it is considered separately and does not have a TEF conversion value. PAHs that are not easily compared to benzo(a)pyrene do not have TEF conversions and are reported separately (Figures 7-9). Figure 4. Total PAH concentration (with TEF conversions) from June 2-August 1, 2016. Monitoring locations are represented by the vertical bars. The green line indicates the DEQ lifetime annual average benchmark for total PAHs as TEF (0.0009 µg/m3). This figure depicts the time period for sampling at City Park. Page 6 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Figure 5. Total PAH concentration (with TEF conversions) from August 4-September 21, 2016. Monitoring locations are represented by the vertical bars. The green line indicates the DEQ lifetime annual average benchmark for total PAHs as TEF (0.0009 µg/m3). This figure depicts the time period for sampling at Old Dufur Road. Figure 6. Total PAH concentration (with TEF conversions) from September 24-November 19, 2016. Monitoring locations are represented by the vertical bars. The Clark St. sampling data includes data from a temporary sampling location that recorded two readings in September before being moved to a more suitable location in October. The green line indicates the DEQ lifetime annual average benchmark for total PAHs as TEF (0.0009 µg/m3). This figure depicts the time period for sampling at Clark Street. Page 7 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Figure 7. Concentration of PAHs from June 2-August 1, 2016 for PAH compounds where toxicity equivalent factor conversions do not exist. Monitoring locations are represented by the vertical bars. This figure depicts the time period for sampling at the City Park. Figure 8. Concentration of PAHs from August 4-September 21, 2016 for PAH compounds where toxicity equivalent factor conversions do not exist. Monitoring locations are represented by the vertical bars. This figure depicts the time period for sampling at Old Dufur Road. Page 8 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Figure 9. Concentration of PAHs from September 24-November 19, 2016 for PAH compounds where toxicity equivalent factor conversions do not exist. Monitoring locations are represented by the vertical bars. The Clark St. sampling data includes data from a temporary sampling location that recorded two readings in September before being moved to a more suitable location in October. This figure depicts the time period for sampling at Clark Street. Table 2 contains the minimum, maximum, average and standard deviation of Total PAH concentrations as TEF detected at each monitoring location as well as a measure of lifetime exposure. As in Table 1, the average concentration at the Wasco County Building location was significantly higher than the average concentrations at any of the other monitoring locations. Additionally, there is evidence that suggests the results from this location can be explained by maximum daily temperature (Figure 10). The correlation between these two variables was significant and results of a linear regression indicated that 53% of the change in total PAH concentration can be explained by changes in maximum daily temperature (Figure 10). There is also a correlation between naphthalene concentrations and maximum daily temperature. This relates to the amount of PAHs that off-gas from the treated ties and is less likely linked to other sources of the PAHs at the facility. Table 2. Total concentration of PAHs (with TEF conversions) per monitoring location over the sampling period (June 2-November 19, 2016). One sample was comprised of concentration levels measured over a 24-hour period. Impact factor indicates the ratio of average concentration of PAHs (with TEF conversions) detected to the DEQ lifetime annual average benchmark (0.0009 µg/m³ STP). An impact factor of one means that the average detection was equal to the DEQ lifetime annual average benchmark. TEF = Toxicity Equivalent Factor. All units in µg/m3 Minimum Detected Maximum Detected Average Standard Deviation Impact Factor Cherry Heights 0.0000 0.0002 0.0001 City Park 0.0002 0.0038 0.0015 Clark St. 0.0002 0.0006 0.0004 Old Dufur Rd. 0.0015 0.0043 0.0024 Wasco County Bldg. 0.0004 0.0204 0.0048 0.0000 0.1 0.0010 1.7 0.0002 0.4 0.0009 2.7 0.0040 5.3 Page 9 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Figure 10. Total PAHs as TEF from the Wasco County Building monitoring location and daily maximum temperature (°C) by date. AmeriTies Production In effort to correlate odor complaints with AmeriTies operations, daily tie production numbers obtained from AmeriTies were plotted along with the daily complaints received by DEQ (Figures 11 through 14). Regression analysis of these two datasets did not show a significant relationship. Daily production records prior to and during the sampling period were assessed to determine if production volume and timing were being influenced by the presence of air quality samplers (Tables 3 and 4). Data show that weekly processing rates were representative throughout the testing period. Figure 11. Comparison of tie production (blue bars) and number of odor complaints (orange bars) by day from April 1 through May 31, 2016. Page 10 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Figure 12. Comparison of tie production (blue bars) and number of odor complaints (orange bars) by day from June 2 through July 24, 2016. Figure 13. Comparison of tie production (blue bars) and number of odor complaints (orange bars) by day from July 25 through September 19, 2016. Page 11 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Figure 14. Comparison of tie production (blue bars) and number of odor complaints (orange bars) by day from September 20 through November 19, 2016. Table 3. Production records for AmeriTies prior to the start of air quality sampling. Production values are measured in non-standard units called “Charges”. One Charge is equal to a full load of railroad ties that is treated and processed. No production occurred on Sundays therefore calculations were made using data from Monday through Saturday. Before Sampling Period (4/1/16 - 6/1/16) All Production Days, n = 53 Min. Production 0 Monday 0 Tuesday 5 Wednesday 4 Thursday 4 Friday 3 Saturday 0 Max. Production 10 4 8 9 9 10 2 Avg. Production 4.6 2.7 6.0 6.1 5.5 6.3 1.0 Table 4. Production records for AmeriTies during the air quality sampling period. Production values are measured in non-standard units called “Charges”. One Charge is equal to a full load of railroad ties that is treated and processed. No production occurred on Sundays therefore calculations were made using data from Monday through Saturday. During Sampling Period (6/216 - 11/19/16) Sample Non-sample Days, n = 59 Days, n = 89 Min. Production 0 0 Max. Production 10 10 Avg. Production 5.5 4.9 Monday 0 7 3.3 Tuesday 2 9 6.4 Wednesday 2 9 6.4 Thursday 3 9 6.8 Friday 0 10 6.4 Saturday 0 7 1.3 Wind Data During the sampling period, a meteorological station was set up between the City Park monitoring location and the AmeriTies facility to measure wind speed and wind direction. Some wind data was not available at the beginning of the sampling period due to the timing of equipment installation. Where wind data was available, a monthly wind rose was produced and compared to citizen complaint records to evaluate if prevailing winds influenced the number of citizen complaints received. Page 12 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Wind directions and speeds vary throughout the day and seasonally. Wind direction supports the data showing the high concentrations observed at the Wasco County location especially for June, July and August (Figures 15-17). Prevailing winds changed in September, October and November as concentration decreased at the Wasco County Building location (Figures 18-20). Also, during periods of calm winds (less than two miles per hour) the effect on PAH odors and where these effects occur are not easily depicted. Figure 21 depicts wind data from August 4, 2016, during which wind speed was calm and a high volume of complaints were received. This supports the community information that odors are noticeable during calm wind days. Figure 15. Monthly summary of complaint location and wind speed and direction data for June 2016. Figure 16. Monthly summary of complaint location and wind speed and direction data for July 2016. Page 13 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Figure 17. Monthly summary of complaint location and wind speed and direction data for August 2016. Figure 18. Monthly summary of complaint location and wind speed and direction data for September 2016. Page 14 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Figure 19. Monthly summary of complaint location and wind speed and direction data for October 2016. Figure 20. Monthly summary of complaint location and wind speed and direction data for November 2016. Page 15 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Figure 21. Daily summary of complaint location as well as wind speed and direction data for August 4, 2016. Conclusions The sampling objective was to determine if emissions associated with AmeriTies were present above human health risk-based concentrations or exceeded background levels. Both naphthalene and total TEF values (for PAHs where conversions exist) were found above their respective lifetime annual average benchmarks throughout the study area. In both cases, average concentrations over the entire sampling period were significantly higher at the Wasco County Building location, which also was the location closest to the facility. This is also supported by the prevailing wind direction. In addition, concentrations of total PAHs, at least near the facility, appeared to be directly influenced by daily maximum temperature. This is likely related to off-gassing from the treated ties and not to other sources within the facility. In addition:     Analysis did not show a strong correlation between the public complaints (nearly 300 complaints during the six month sampling period) received and the number of ties treated per day. No correlation was found between level of tie production and either naphthalene or total PAH concentrations in the air samples. Production levels on sampling days were comparable to production levels on days when no samples were collected. Wind speed and direction correlate with detected PAH concentrations at the Wasco County Building location. Next Steps As part of the Mutual Agreement and Order with DEQ, AmeriTies has agreed to change the formulation of the preservative that is used to treat the railroad ties produced at the facility in The Dalles. This changeover occurred in the beginning of December, 2016. DEQ staff are currently establishing a sampling plan to monitor emissions following this change. This sampling will need to take into account the change in formulation as well as the information gathered during this study. Depending on wind patterns and temperatures, monitoring locations and time periods need to be strategically selected in order to accurately reflect the conditions present. Page 16 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Acenaphthylene Anthracene Benzo(a)anthracene Benzo(a)pyrene Benzo(b)fluoranthene Benzo(e)pyrene Benzo(g,h,i)perylene Benzo(k)fluoranthene Chrysene Coronene Dibenzo(a,h)anthracene Dibenzofuran Dibenzothiophene Fluoranthene Fluorene Indeno(1,2,3-cd)pyrene Naphthalene Perylene Phenanthrene Pyrene TEF 0.001 0.001 0.0005 0.005 1 0.1 — 0.02 0.05 0.03 — 1.1 — — 0.05 0.001 0.1 — — 0.0005 0.001 — ABC — — — — — — — — — — — — — — — — — 0.03 — — — 0.00090000 Total PAHs as TEF Acenaphthene Appendix A: Sampling Results Cherry Heights Sample Results (µg/m3 STP) 6/2/2016 0.0031 0.0006 ND ND ND ND ND ND ND ND ND ND 0.0025 0.0004 ND 0.0019 ND 0.0142 ND 0.0029 ND 0.00000702 6/5/2016 — — — — — — — — — — — — — — — — — — — — — — 6/6/2016 — — — — — — — — — — — — — — — — — — — — — — 6/8/2016 0.0026 0.0004 ND ND ND ND ND ND ND ND ND ND 0.0023 0.0005 ND 0.0018 ND 0.0101 ND 0.0025 ND 0.00000613 6/11/2016 0.0016 ND ND ND ND ND ND ND ND ND ND ND 0.0014 ND ND 0.0011 ND 0.0105 ND 0.0017 ND 0.00000354 6/14/2016 ND ND ND ND ND ND ND ND ND ND ND 0.0009 0.0089 ND 0.0012 ND 0.00000146 ND ND ND ND ND ND ND ND ND ND 0.0118 ND 0.0006 ND ND ND 0.0007 0.0008 6/17/2016 ND 0.0164 0.0079 ND 0.0901 ND 0.0066 ND 0.00005810 6/20/2016 0.0034 ND ND ND ND ND ND ND ND ND ND ND 0.0043 0.0006 0.0006 0.0031 ND 0.0130 ND 0.0040 ND 0.00003950 6/23/2016 0.0010 ND ND ND ND ND ND ND ND ND ND 0.0011 ND ND 0.0063 ND 0.0016 ND ND ND ND ND ND ND ND ND ND 0.0118 ND 0.0104 ND 0.0356 ND 0.0124 ND 0.0008 0.00000283 0.0157 ND 0.0017 0.0010 6/26/2016 ND 0.0006 6/29/2016 0.0064 ND ND ND ND ND ND 0.0060 0.0052 ND 0.0222 ND 0.0040 ND ND ND ND ND ND 0.0042 0.0005 0.0036 ND 0.0175 ND 0.0040 ND 0.0004 0.00003405 ND ND 0.0004 0.0004 ND ND 0.0004 ND 0.0024 ND 0.0005 ND 7/3/2016 ND 0.0008 7/6/2016 0.0046 ND ND ND ND ND ND ND ND ND ND ND 0.0044 0.0005 ND 0.0037 ND 0.0206 ND 0.0036 ND 0.00001007 7/8/2016 0.0035 ND ND ND ND ND ND ND ND ND ND ND 0.0030 0.0004 ND 0.0026 ND 0.0097 ND 0.0030 ND 0.00000752 7/11/2016 0.0019 ND ND ND ND ND ND ND ND ND ND 0.0015 0.0082 ND 0.0020 ND ND ND ND ND ND ND ND ND 0.0146 0.0102 ND 0.0909 ND 0.0078 ND 0.0006 0.00000430 ND ND 0.0010 ND 0.0172 ND 0.0006 0.0014 7/14/2016 ND 0.0004 7/17/2016 0.0053 ND ND ND ND ND ND ND ND ND ND 0.0054 0.0006 0.0006 0.0044 ND 0.0180 ND 0.0044 0.0267 ND ND ND ND ND ND ND ND ND ND 0.0225 0.0011 0.0011 0.0146 ND 0.0861 ND 0.0100 ND 0.0006 0.00004048 7/20/2016 ND 0.0006 7/23/2016 0.0018 ND ND ND ND ND ND ND ND ND ND ND 0.0017 ND 0.0075 ND 0.0019 ND 0.00000417 0.0094 ND ND ND ND ND ND ND ND ND ND ND 0.0064 ND 0.0005 0.0015 7/26/2016 ND 0.0006 0.0055 ND 0.0269 ND 0.0051 ND 0.00004098 7/28/2016 — — — — — — — — — — — — — — — — — — — — — — 7/29/2016 0.0211 ND 0.0005 ND ND ND ND ND ND ND ND ND 0.0259 0.0017 0.0218 ND 0.0648 ND 0.0164 0.0011 0.00013888 8/1/2016 0.0018 ND ND ND ND ND ND ND ND ND ND ND 0.0027 ND 0.0007 0.0009 0.0028 ND 0.0064 ND 0.0041 0.0005 0.00005021 Data Quality Key Abbreviation Key Data met all QC and method criteria TEF = EPA Toxicity Equivalency Factor Results estimated. Either below quantitation limit or because of issues during sampling or analysis ABC = DEQ Ambient Benchmark Criteria Data of unacceptable quality ND = Non-detect 0.00011840 0.00004692 0.00008014 0.00010315 Page 17 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Dibenzofuran Dibenzothiophene Fluoranthene Fluorene Indeno(1,2,3-cd)pyrene Naphthalene Perylene Phenanthrene Pyrene Total PAHs as TEF — — — — — — 0.03 — — — 0.0009 Coronene 0.001 Chrysene 0.0005 Benzo(k)fluoranthene — Benzo(g,h,i)perylene — Benzo(e)pyrene 0.1 Benzo(b)fluoranthene 0.001 Benzo(a)pyrene 0.05 Benzo(a)anthracene — Anthracene — Acenaphthylene 1.1 Acenaphthene Dibenzo(a,h)anthracene STP = Standard temperature and pressure TEF 0.001 0.001 0.0005 0.005 1 0.1 — 0.02 0.05 0.03 — ABC — — — — — — — — — — — — Cherry Heights Sample Results (µg/m STP) 3 8/4/2016 0.0326 0.0006 0.0009 ND ND ND ND ND ND ND ND ND 0.0291 0.0018 0.0014 0.0235 ND 0.1410 ND 0.0159 0.0009 0.00013598 8/7/2016 0.0016 ND ND ND ND ND ND ND ND ND ND 0.0018 0.0005 0.0005 0.0017 ND 0.0068 ND 0.0021 0.0073 ND ND ND ND ND ND ND ND ND 0.0066 0.0009 0.0009 0.0051 ND 0.0315 ND 0.0049 8/13/2016 0.0117 ND ND ND ND ND ND ND ND ND 0.0165 0.0014 0.0015 0.0142 ND 0.0393 ND 0.0117 0.0010 0.00013070 8/16/2016 0.0107 ND ND ND ND ND ND ND ND ND 0.0127 0.0012 0.0012 0.0105 ND 0.0401 ND 0.0086 0.0008 0.00008609 8/18/2016 0.0216 ND 0.0006 ND 0.0006 ND 0.0005 ND 0.0006 0.00002782 8/10/2016 ND 0.0005 0.0004 ND ND ND ND ND ND ND ND ND 0.0232 0.0018 0.0013 0.0171 ND 0.1000 ND 0.0161 0.0010 0.00011398 8/21/2016 0.0047 ND ND ND ND ND ND ND ND ND ND ND 0.0035 0.0005 ND 0.0224 ND 0.0030 ND 0.00000900 0.0130 ND ND ND ND ND ND ND ND ND ND 0.0092 0.0006 0.0065 ND 0.0790 ND 0.0050 0.0287 ND ND ND ND ND ND ND ND ND 0.0270 0.0014 0.0014 0.0181 ND 0.2110 ND 0.0126 8/24/2016 0.0353 ND 0.0004 ND 0.0006 0.00005549 8/23/2016 ND 0.0007 ND 0.0007 0.0028 8/22/2016 0.0008 ND ND ND ND ND ND ND ND ND 0.0363 0.0018 0.0019 0.0238 ND 0.2110 ND 0.0176 0.0008 0.00016654 8/25/2016 0.0208 ND 0.0005 ND ND ND ND ND ND ND ND ND 0.0253 0.0013 0.0014 0.0166 ND 0.1860 ND 0.0118 0.0006 0.00011360 8/26/2016 0.0041 ND ND ND ND ND ND ND ND ND ND ND 0.0090 0.0009 0.0011 0.0059 ND 0.0265 ND 0.0067 0.0005 0.00006628 8/27/2016 — — — — — — — — — — — — — — — — — — — — — — 8/31/2016 0.0106 ND ND ND ND ND ND ND ND ND ND ND 0.0087 0.0005 0.0006 0.0061 ND 0.0669 ND 0.0047 ND 0.00004858 9/3/2016 0.0011 ND ND ND ND ND ND ND ND ND 0.0011 0.0061 ND 0.0014 ND 0.00000283 ND ND ND ND ND ND ND ND ND 0.0044 ND 0.0005 ND ND ND 0.0005 0.0011 0.0062 ND 0.0005 ND 9/6/2016 0.0034 ND 0.0194 ND 0.0038 ND 0.00003773 9/9/2016 0.0076 ND 0.0005 ND ND ND ND ND ND ND ND ND 0.0071 0.0005 0.0007 0.0052 ND 0.0524 ND 0.0047 ND 0.00004792 9/12/2016 0.0089 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.0066 0.00116 0.0004 0.0114 0.0032 0.00069 0.00069 0.00987 ND ND ND ND 0.00005404 0.00095 0.0004 ND ND ND ND 0.0057 0.0164 0.0040 ND ND ND ND 0.0419 0.0152 ND ND ND ND 0.0007 9/21/2016 ND ND ND ND 0.0006 0.0159 0.0034 0.0005 ND ND 0.0087 9/15/2016 9/18/2016 ND ND ND ND 0.00039 0.0147 Data Quality Key Abbreviation Key Data met all QC and method criteria TEF = EPA Toxicity Equivalency Factor Results estimated. Either below quantitation limit or because of issues during sampling or analysis ABC = DEQ Ambient Benchmark Criteria Data of unacceptable quality ND = Non-detect 0.105 0.0159 0.137 0.00878 0.0035 0.00648 0.00005861 0.00012300 0.00008969 0.00002879 0.00006301 STP = Standard temperature and pressure Page 18 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Coronene Dibenzo(a,h)anthracene 0.03 — 1.1 ABC — — — — — — — — — — — — — Total PAHs as TEF Chrysene 0.05 Pyrene Benzo(k)fluoranthene 0.02 Phenanthrene Benzo(g,h,i)perylene — Perylene Benzo(e)pyrene 0.1 Naphthalene Benzo(b)fluoranthene 1 Indeno(1,2,3-cd)pyrene Benzo(a)pyrene 0.005 Fluorene Benzo(a)anthracene 0.0005 Fluoranthene Anthracene 0.001 Dibenzothiophene Acenaphthylene 0.001 Dibenzofuran Acenaphthene TEF — — 0.05 0.001 0.1 — — 0.0005 0.001 — — — — — 0.03 — — — 0.0009 ND ND ND ND 0.00088 0.00039 ND 0.00081 0.00043 ND 0.00042 ND ND ND ND ND ND ND ND ND 0.00041 0.0274 0.00756 0.167 0.0786 0.0251 0.032 0.0833 0.052 0.0824 0.414 0.0653 0.117 0.0329 0.0848 0.184 0.0855 0.0885 0.0495 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.00331 0.00211 0.00892 0.00359 0.00269 0.00481 0.00388 0.0059 0.00673 0.016 0.00496 0.00754 0.00431 0.0053 0.0101 0.00459 0.00767 0.00696 ND ND ND ND ND ND ND 0.00045 0.0008 0.00042 0.00063 0.00042 0.00083 0.00052 0.00091 0.00138 0.00198 0.00085 0.00104 0.00076 0.00081 0.00137 0.00065 0.00115 0.00126 0.0038 0.00163 0.0155 0.00496 0.0024 0.00421 0.00603 0.00596 0.00535 0.0268 0.00491 0.00869 0.0042 0.0063 0.0147 0.00649 0.00779 0.0054 0.00001034 0.00000404 0.00008559 0.00003690 0.00000670 0.00005718 0.00004457 0.00006539 0.00013896 0.00018708 0.00005751 0.00008420 0.00005281 0.00006332 0.00016447 0.00005099 0.00008588 0.00012225 — Cherry Heights Sample Results (µg/m STP) 3 9/24/2016 9/27/2016 9/30/2016 10/3/2016 10/6/2016 10/9/2016 10/12/2016 10/15/2016 10/18/2016 10/21/2016 10/24/2016 10/27/2016 10/30/2016 11/2/2016 11/5/2016 11/8/2016 11/11/2016 11/13/2016 11/14/2016 11/15/2016 11/16/2016 11/17/2016 11/18/2016 ND ND ND ND ND ND ND ND 0.00065 ND ND ND ND ND 0.00076 0.001 ND 0.0008 0.0013 ND 0.00049 0.00056 0.00047 0.0032 0.00045 0.00105 0.00133 0.00055 ND ND — 0.0268 0.00386 0.0149 0.0128 0.00488 0.00135 0.0248 0.00864 0.00295 0.00906 0.0106 0.0105 0.00674 0.0507 0.00713 0.0183 0.0075 0.013 0.0299 0.00925 0.0147 0.00688 0.00068 0.00061 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND — — — — — — — 0.00042 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.00062 0.00069 ND ND 0.00076 ND 0.00042 ND ND ND ND ND ND ND ND 0.00038 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.00538 0.00182 0.0246 0.00758 0.00407 0.00634 0.00934 0.00924 0.00822 0.0418 0.00781 0.0143 0.00703 0.0112 0.0241 0.011 0.0115 0.00846 — — — — — — — — — — — — — ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.0149 0.0035 0.0102 0.01 0.00043 ND ND ND 0.00066 ND 0.00935 0.00208 0.00592 0.0059 ND ND ND ND 0.183 0.0348 0.117 0.0976 ND ND ND ND 0.00534 0.00203 0.00382 0.00471 0.00039 ND 0.00046 0.00038 0.00142 ND 0.00055 ND 0.00057 0.0009 0.00041 ND ND ND ND ND 0.00042 ND ND Data Quality Key Abbreviation Key Data met all QC and method criteria TEF = EPA Toxicity Equivalency Factor Results estimated. Either below quantitation limit or because of issues during sampling or analysis ABC = DEQ Ambient Benchmark Criteria Data of unacceptable quality ND = Non-detect 0.00048 0.00094 0.00093 0.00049 0.00067 0.00039 0.0004 0.00074 ND 0.00066 0.00085 0.00039 0.00064 0.00007263 0.00000696 0.00005224 0.00006760 STP = Standard temperature and pressure Page 19 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Dibenzo(a,h)anthracene Dibenzofuran Dibenzothiophene Fluoranthene Fluorene Indeno(1,2,3-cd)pyrene Naphthalene Perylene Phenanthrene Pyrene Total PAHs as TEF — — — — — 0.03 — — — 0.0009 Coronene — Chrysene 0.001 Benzo(k)fluoranthene 0.0005 Benzo(g,h,i)perylene — Benzo(e)pyrene — Benzo(b)fluoranthene 0.1 Benzo(a)pyrene 0.001 Benzo(a)anthracene 0.05 Anthracene — Acenaphthylene — Acenaphthene 1.1 TEF 0.001 0.001 0.0005 0.005 1 0.1 — 0.02 0.05 0.03 — ABC — — — — — — — — — — — — City Park Sample Results (µg/m STP) 3 6/2/2016 0.0149 ND 0.0006 ND ND ND ND ND ND ND ND ND 0.0127 0.0012 0.0042 0.0095 ND 0.0517 ND 0.0177 0.0017 0.000245 6/5/2016 — — — — — — — — — — — — — — — — — — — — — — 6/8/2016 — 0.0011 — 0.0014 — — — — — — — — — ND ND ND ND ND ND ND — 0.0077 — 0.0353 ND — 0.3010 ND — 0.0368 — 0.0031 — ND — 0.0027 — ND — 0.0523 — 6/11/2016 — 0.0998 0.000541 6/14/2016 0.0459 0.0006 0.0009 ND ND ND ND ND ND ND ND ND 0.0226 0.0012 0.0031 0.0145 ND 0.1970 ND 0.0156 0.0012 0.000223 6/17/2016 0.2420 0.0017 0.0020 ND ND ND ND ND ND ND ND 0.1270 0.0041 0.0068 0.0795 ND 0.8820 ND 0.0549 0.0025 0.000696 6/20/2016 0.1500 0.0017 0.0060 ND ND ND ND ND ND ND 0.0005 ND ND 0.0892 0.0063 0.0294 0.0674 ND 0.3320 ND 0.1020 0.0126 0.00177 6/23/2016 0.0340 0.0005 0.0019 ND ND ND ND ND ND ND 0.0185 0.0019 0.0073 0.0135 ND 0.0975 ND 0.0265 0.0026 0.000429 6/26/2016 0.0042 0.0162 ND ND ND ND ND ND ND 0.0007 ND 0.5310 ND ND 0.3190 0.0177 0.0484 0.2420 ND 0.8680 ND 0.2560 0.0228 0.003378 6/29/2016 0.2650 0.0027 0.0087 ND ND ND ND ND ND 0.0006 ND ND 0.1420 0.0081 0.0333 0.1010 ND 0.6120 ND 0.1230 0.0160 0.002134 7/3/2016 0.0270 0.0009 0.0022 ND ND ND ND ND ND ND ND ND 0.0198 0.0021 0.0098 0.0181 ND 0.0474 ND 0.0330 0.0041 0.000558 7/6/2016 0.2390 0.0025 0.0058 ND ND ND ND ND ND ND ND ND 0.1200 0.0058 0.0196 0.0838 ND 0.5890 ND 0.0884 0.0100 0.001362 7/8/2016 0.1830 0.0013 0.0030 ND ND ND ND ND ND ND ND ND 0.0971 0.0037 0.0078 0.0638 ND 0.5440 ND 0.0528 0.0030 0.000668 7/11/2016 0.0218 0.0021 ND ND ND ND ND ND ND 0.0161 0.0026 0.0141 0.0143 ND 0.0310 ND 0.0414 0.0065 0.000769 0.7070 0.0092 ND ND ND ND ND ND ND 0.0007 ND 7/14/2016 ND 0.0039 ND ND 0.3800 0.0106 0.0261 0.2480 ND 1.7100 ND 0.1570 0.0134 0.00238 7/17/2016 0.2440 0.0016 0.0068 ND ND ND ND ND ND 0.0005 ND ND 0.1430 0.0082 0.0297 0.1090 ND 0.5190 ND 0.1200 0.0150 0.001932 7/20/2016 0.6370 0.0035 0.0097 ND ND ND ND ND ND 0.0006 ND ND 0.3500 0.0118 0.0371 0.2400 ND 1.5200 ND 0.1910 0.0179 0.002873 7/23/2016 0.0557 0.0005 0.0027 ND ND ND ND ND ND ND ND 0.0377 0.0038 0.0189 0.0300 ND 0.1290 ND 0.0606 0.0082 0.001071 7/26/2016 0.2860 0.0019 0.0074 ND ND ND ND ND ND ND 0.1550 0.0088 0.0302 0.1160 ND 0.6240 ND 0.1290 0.0153 0.002013 7/29/2016 0.3580 0.0032 0.0124 ND 0.0006 ND 0.0005 ND ND ND ND ND 0.0019 ND ND 0.2620 0.0155 0.0606 0.1980 ND 0.6700 ND 0.2640 0.0356 0.003823 8/1/2016 0.0329 0.0005 0.0049 ND ND ND ND ND ND 0.0008 ND ND 0.0306 0.0058 0.0318 0.0293 ND 0.0374 ND 0.0934 0.0162 0.001741 Data Quality Key Abbreviation Key Data met all QC and method criteria TEF = EPA Toxicity Equivalency Factor Results estimated. Either below quantitation limit or because of issues during sampling or analysis ABC = DEQ Ambient Benchmark Criteria Data of unacceptable quality ND = Non-detect STP = Standard temperature and pressure Page 20 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Dibenzo(a,h)anthracene Dibenzofuran Dibenzothiophene Fluoranthene Fluorene Indeno(1,2,3-cd)pyrene Naphthalene Perylene Phenanthrene Pyrene Total PAHs as TEF — — — — — 0.03 — — — 0.0009 Coronene — Chrysene 0.001 Benzo(k)fluoranthene 0.0005 Benzo(g,h,i)perylene — Benzo(e)pyrene — Benzo(b)fluoranthene 0.1 Benzo(a)pyrene 0.001 Benzo(a)anthracene 0.05 Anthracene — Acenaphthylene — Acenaphthene 1.1 TEF 0.001 0.001 0.0005 0.005 1 0.1 — 0.02 0.05 0.03 — ABC — — — — — — — — — — — — Old Dufur Rd. Sample Results (µg/m STP) 3 8/4/2016 0.5760 0.0021 0.0071 ND ND ND ND ND 0.0004 0.0006 ND ND 0.3700 0.0107 0.0229 0.2960 ND 0.9450 ND 0.3940 0.0151 0.002273 8/7/2016 0.5630 0.0030 0.0154 ND ND ND ND ND ND ND ND ND 0.3000 0.0176 0.0242 0.2290 ND 0.8530 ND 0.2670 0.0136 0.00216 8/10/2016 0.4930 0.0034 0.0161 ND ND ND ND ND ND ND ND 0.2730 0.0178 0.0245 0.2030 ND 0.8410 ND 0.2150 0.0145 0.002054 8/13/2016 0.5230 0.0040 0.0141 ND ND ND ND ND ND ND 0.0005 ND ND 0.3300 0.0174 0.0281 0.2570 ND 0.5760 ND 0.3010 0.0185 0.002381 8/16/2016 0.9950 0.0053 0.0196 ND ND ND ND ND ND 0.0006 ND ND 0.5150 0.0259 0.0379 0.3910 ND 1.4100 ND 0.4230 0.0228 0.003548 8/18/2016 1.1700 0.0074 0.0203 ND ND ND ND ND ND 0.0009 ND ND 0.7310 0.0315 0.0445 0.5310 ND 1.9500 ND 0.6080 0.0298 0.004305 8/21/2016 0.8140 0.0042 0.0279 ND ND ND ND ND ND 0.0005 ND ND 0.5000 0.0283 0.0521 0.4330 ND 1.3200 ND 0.4090 0.0257 0.004116 8/22/2016 0.5140 0.0030 0.0108 ND ND ND ND ND ND ND ND ND 0.3240 0.0149 0.0221 0.2420 ND 1.1500 ND 0.2030 0.0096 0.00198 8/23/2016 0.3580 0.0019 0.0053 ND ND ND ND ND ND ND ND ND 0.2410 0.0097 0.0172 0.1840 ND 0.9660 ND 0.1650 0.0074 0.001496 8/24/2016 0.3260 0.0024 0.0056 ND ND ND ND ND ND ND ND ND 0.2450 0.0127 0.0220 0.1850 ND 1.0300 ND 0.1690 0.0091 0.00171 8/25/2016 0.3520 0.0026 0.0041 ND ND ND ND ND ND ND ND ND 0.2460 0.0110 0.0203 0.1810 ND 1.4100 ND 0.1530 0.0083 0.001637 8/26/2016 0.3580 0.0026 0.0074 ND ND ND ND ND ND ND ND ND 0.2870 0.0136 0.0285 0.2160 ND 0.7920 ND 0.2080 0.0119 0.002121 8/27/2016 — — — — — — — — — — — — — — — — — — — — — — 8/31/2016 0.7730 0.0042 0.0225 ND ND ND ND ND ND ND ND ND 0.4210 0.0217 0.0286 0.3290 ND 1.5100 ND 0.2750 0.0168 0.002702 9/3/2016 0.4480 0.0027 0.0119 ND ND ND ND ND ND ND ND ND 0.2800 0.0153 0.0189 0.2220 ND 0.8480 ND 0.1910 0.0087 0.001728 9/6/2016 0.4390 0.0043 0.0093 ND ND ND ND ND ND ND ND ND 0.2580 0.0127 0.0169 0.2010 ND 0.9620 ND 0.1620 0.0077 0.001583 Data Quality Key Abbreviation Key Data met all QC and method criteria TEF = EPA Toxicity Equivalency Factor Results estimated. Either below quantitation limit or because of issues during sampling or analysis ABC = DEQ Ambient Benchmark Criteria Data of unacceptable quality ND = Non-detect STP = Standard temperature and pressure Page 21 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Dibenzo(a,h)anthracene Dibenzofuran Dibenzothiophene Fluoranthene Fluorene Indeno(1,2,3-cd)pyrene Naphthalene Perylene Phenanthrene Pyrene Total PAHs as TEF — — — — — 0.03 — — — 0.0009 0.0013 0.0018 0.0221 ND 0.2650 ND 0.0147 0.0007 0.0002 0.0002 — Coronene — Chrysene 0.001 Benzo(k)fluoranthene 0.0005 Benzo(g,h,i)perylene — Benzo(e)pyrene — Benzo(b)fluoranthene 0.1 Benzo(a)pyrene 0.001 Benzo(a)anthracene 0.05 Anthracene — Acenaphthylene — Acenaphthene 1.1 TEF 0.001 0.001 0.0005 0.005 1 0.1 — 0.02 0.05 0.03 — ABC — — — — — — — — — — — — Clark St. Sample Results (µg/m STP) 3 ND ND ND ND 0.0007 ND ND ND ND ND ND ND ND ND ND ND ND 0.0124 0.0011 0.0026 0.0097 ND 0.0798 ND 0.0131 0.0010 — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — ND 0.0780 ND 1.1100 ND 0.0422 0.0027 0.0006 0.2450 ND 0.0144 0.0014 0.0002 9/27/2016* 0.0179 0.0004 ND 0.0007 ND 10/6/2016* — — — — 10/14/2016 — — — — — — — — — 0.0044 ND ND ND ND ND ND ND ND ND ND ND 0.0004 ND ND ND ND 0.0234 0.0011 0.0029 0.0155 ND 9/24/2016* 10/21/2016 0.0452 ND 0.2090 0.0022 0.0324 0.1220 0.0038 0.0054 10/24/2016 0.0344 0.0005 0.0011 ND 10/27/2016 0.1710 0.0024 0.0034 ND ND ND ND ND ND ND ND ND 0.0975 0.0030 0.0049 0.0630 ND 0.8990 ND 0.0345 0.0029 0.0005 10/30/2016 0.0299 0.0014 0.0009 ND ND ND ND ND ND ND ND ND 0.0208 0.0010 0.0021 0.0132 ND 0.1010 ND 0.0126 0.0012 0.0002 ND ND ND ND ND ND ND ND 0.0637 0.0022 0.0037 0.0406 ND 0.6200 ND 0.0237 0.0022 0.0004 ND ND ND 0.0004 ND ND 0.0605 0.0023 0.0039 0.0372 0.0005 0.3790 ND 0.0271 0.0021 0.0004 ND ND ND 0.0005 ND ND 0.0931 0.0033 0.0048 0.0559 0.0004 ND 0.8630 ND 0.0349 0.0025 0.0005 0.4000 ND 0.0343 0.0032 0.0005 0.2380 ND 0.0166 0.0018 0.0003 11/2/2016 0.1070 0.0019 0.0022 ND 11/5/2016 0.0898 0.0050 0.0021 ND ND 11/8/2016 0.1280 0.0037 0.0030 ND ND 0.0004 ND 11/11/2016 0.0996 0.0027 0.0034 ND ND ND ND ND ND 0.0005 ND ND 0.0579 0.0029 0.0057 0.0407 11/13/2016 0.0476 0.0030 0.0015 ND ND ND ND ND 0.0005 ND ND 0.0304 0.0013 0.0030 0.0198 11/14/2016 0.2050 0.0025 0.0025 ND ND 0.0004 ND ND ND ND 0.0004 ND ND 0.1090 0.0036 0.0057 0.0674 0.0005 ND 1.0300 ND 0.0405 0.0031 0.0006 ND ND ND ND ND 0.0004 ND ND 0.0891 0.0025 0.0035 0.0513 ND 1.0000 ND 0.0281 0.0020 0.0004 11/15/2016 0.1770 0.0020 0.0031 ND 11/16/2016 — — — — — — — — — — — — — — — — — — — — — — 11/17/2016 0.1210 0.0039 0.0026 0.0005 ND 0.0004 ND ND ND 0.0007 ND ND 0.0665 0.0019 0.0031 0.0395 0.0005 0.8370 ND 0.0223 0.0020 0.0004 11/18/2016 0.1390 0.0028 0.0033 0.0005 ND 0.0005 ND ND 0.0004 0.0007 ND ND 0.0721 0.0021 0.0039 0.0440 0.0005 0.9120 ND 0.0259 0.0025 0.0005 Data Quality Key Data met all QC and method criteria Results estimated. Either below quantitation limit or because of issues during sampling or analysis Abbreviation Key TEF = EPA Toxicity Equivalency Factor ABC = DEQ Ambient Benchmark Criteria Data of unacceptable quality ND = Non-detect STP = Standard temperature and pressure * = Samples collected at the Eight and Harris sampling location before monitoring equipment was moved to the Clark St. sampling location. Page 22 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Coronene Dibenzo(a,h)anthracene 0.03 — 1.1 ABC — — — — — — — — — — — — — Total PAHs as TEF Chrysene 0.05 Pyrene Benzo(k)fluoranthene 0.02 Phenanthrene Benzo(g,h,i)perylene — Perylene Benzo(e)pyrene 0.1 Naphthalene Benzo(b)fluoranthene 1 Indeno(1,2,3-cd)pyrene Benzo(a)pyrene 0.005 Fluorene Benzo(a)anthracene 0.0005 Fluoranthene Anthracene 0.001 Dibenzothiophene Acenaphthylene 0.001 Dibenzofuran Acenaphthene TEF — — 0.05 0.001 0.1 — — 0.0005 0.001 — — — — — 0.03 — — — 0.0009 Wasco County Planning Building Sample Results (µg/m STP) 3 6/2/2016 2.5400 0.0095 0.0400 ND 0.0006 ND ND ND 0.0010 ND ND 1.3100 0.0540 0.0669 0.9220 0.0004 5.3700 ND 0.7030 0.0329 0.007352 0.0850 ND 0.0012 6/5/2016 3.6300 0.0060 ND ND ND ND 0.0030 ND ND 1.9200 0.1020 0.2280 1.5500 ND 1.5400 0.1080 0.017603 0.0436 0.0005 ND ND ND ND 0.0012 ND ND 1.5800 0.0642 0.0765 1.1700 ND 0.0004 4.0300 0.0117 ND 0.0006 6/8/2016 2.9900 4.7500 ND 0.8280 0.0382 0.00861 6/11/2016 6/14/2016 1.9800 0.0068 0.0308 0.0006 ND ND 1.0900 0.0456 0.0642 0.8200 ND 0.6170 0.0311 0.00639 ND ND 0.0012 ND ND 0.9340 0.0356 0.0405 0.6380 ND 0.0005 3.6000 ND ND 0.0004 ND 0.0288 ND 0.0007 ND 0.0079 ND 0.0004 ND 1.9400 5.7800 ND 0.3860 0.0198 0.004991 6/17/2016 0.7940 0.0042 0.0115 ND ND ND ND ND ND ND ND 0.4820 0.0176 0.0258 0.3290 ND 1.8300 ND 0.2460 0.0106 0.002557 6/20/2016 2.6800 0.0080 0.0458 ND ND ND ND ND ND ND 0.0012 ND ND 1.3300 0.0665 0.1110 1.0300 ND 3.6800 ND 0.8990 0.0524 0.00983 6/23/2016 2.5100 0.0102 0.0495 ND ND ND ND ND ND 0.0009 ND ND 1.2700 0.0456 0.0585 0.9660 ND 4.3000 ND 0.5930 0.0277 0.006787 6/26/2016 0.4930 0.0034 0.0121 ND ND ND ND ND 0.0008 ND ND 0.3220 0.0192 0.0522 0.2520 ND 0.6640 ND 0.2760 0.0262 0.003554 6/29/2016 4.1100 0.0273 0.1070 ND 0.0007 ND ND ND ND ND 0.0017 ND ND 1.8900 0.0875 0.1290 1.4400 ND 5.6900 ND 1.1300 0.0681 0.012767 7/3/2016 — — — — — — — — — — — — — — — — — — — — — — 7/6/2016 0.6860 0.0065 0.0380 ND ND ND ND ND ND 0.0010 ND ND 0.4120 0.0369 0.0571 0.3530 ND 0.5180 ND 0.4100 0.0433 0.004198 7/8/2016 1.3400 0.0059 0.0235 ND ND ND ND ND 0.0004 ND ND 0.7390 0.0303 0.0371 0.5360 ND 2.0300 ND 0.3950 0.0190 0.003977 7/11/2016 1.3300 0.0063 0.0382 ND ND ND 0.0005 ND ND ND 0.0011 ND ND 0.7490 0.0449 0.0589 0.6130 ND 1.6300 ND 0.5630 0.0438 0.005316 7/14/2016 1.9000 0.0070 0.0440 ND ND 0.0004 ND ND ND 0.0013 ND ND 1.0600 0.0520 0.0749 0.8380 ND 2.4000 ND 0.7050 0.0548 0.007 7/17/2016 1.2800 0.0050 0.0358 ND ND ND ND ND ND 0.0010 ND ND 0.7420 0.0444 0.0720 0.6320 ND 1.2700 ND 0.6260 0.0469 0.005924 7/20/2016 0.9900 0.0051 0.0307 ND ND ND ND ND ND 0.0009 ND ND 0.6260 0.0352 0.0431 0.5020 ND 1.1300 ND 0.4470 0.0378 0.003955 7/23/2016 1.4600 0.0074 0.0346 ND ND ND 0.0008 ND ND 0.8290 0.0424 0.0464 0.6510 ND 1.9700 ND 0.5460 0.0391 0.00479 3.2300 0.0113 0.0581 ND 0.0004 ND 7/26/2016 ND 0.0006 ND ND ND 0.0016 ND ND 1.6200 0.0768 0.0915 1.2800 ND 3.9200 ND 1.0600 0.0536 0.0098 7/29/2016 3.4400 0.0115 0.1140 0.0014 ND ND ND ND 2.3800 0.1310 0.2720 1.9500 ND 3.1700 ND 2.0800 0.1490 0.020355 0.0154 0.0886 0.0009 ND ND ND ND 0.0005 0.0034 2.8600 ND 0.0007 ND 8/1/2016 0.0019 ND ND 1.7600 0.0921 0.1330 1.3400 ND 4.0200 ND 1.2000 0.0742 0.011735 ND Data Quality Key Abbreviation Key Data met all QC and method criteria TEF = EPA Toxicity Equivalency Factor Results estimated. Either below quantitation limit or because of issues during sampling or analysis ABC = DEQ Ambient Benchmark Criteria Page 23 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Data of unacceptable quality ND = Non-detect Acenaphthene Acenaphthylene Anthracene Benzo(a)anthracene Benzo(a)pyrene Benzo(b)fluoranthene Benzo(e)pyrene Benzo(g,h,i)perylene Benzo(k)fluoranthene Chrysene Coronene Dibenzo(a,h)anthracene Dibenzofuran Dibenzothiophene Fluoranthene Fluorene Indeno(1,2,3-cd)pyrene Naphthalene Perylene Phenanthrene Pyrene Total PAHs as TEF STP = Standard temperature and pressure TEF 0.001 0.001 0.0005 0.005 1 0.1 — 0.02 0.05 0.03 — 1.1 — — 0.05 0.001 0.1 — — 0.0005 0.001 — ABC — — — — — — — — — — — — — — — — — 0.03 — — — 0.0009 Wasco County Planning Building Sample Results (µg/m3 STP) 8/4/2016 1.5900 0.0086 0.0417 0.0007 ND ND ND ND ND 0.0017 ND ND 0.9430 0.0500 0.1190 0.7230 ND 2.2800 ND 0.8510 0.0492 0.00882 8/7/2016 1.1900 0.0076 0.0254 ND ND ND ND ND 0.0008 ND ND 0.6280 0.0328 0.0443 0.4680 ND 2.3400 ND 0.5190 0.0308 0.004208 8/10/2016 1.2200 0.0077 0.0296 ND ND ND ND 0.0007 ND ND 0.7480 0.0306 0.0410 0.5710 ND 2.4000 ND 0.5380 0.0278 0.004203 8/13/2016 1.0400 0.0059 0.0280 ND 0.0005 ND 0.0004 ND ND ND ND ND 0.0011 ND ND 0.6080 0.0304 0.0544 0.4780 ND 0.9990 ND 0.6400 0.0371 0.00465 8/16/2016 4.6000 0.0099 0.0496 0.0006 ND ND ND ND ND 0.0014 ND ND 1.0500 0.0604 0.1110 0.8040 ND 5.4900 ND 0.9460 0.0518 0.011559 8/18/2016 3.6100 0.0128 0.0616 0.0008 ND ND ND ND 0.0019 ND ND 2.3000 0.0820 0.1340 0.9490 ND 5.4300 ND 1.1200 0.0751 0.011999 8/21/2016 1.7500 0.0100 0.0494 0.0005 ND ND 0.0005 ND ND ND 0.0015 ND ND 0.9020 0.0581 0.0963 0.9040 ND 2.7900 ND 0.7880 0.0493 0.008047 8/22/2016 1.1600 0.0072 0.0339 ND ND ND ND ND ND 0.0006 ND ND 0.7510 0.0386 0.0595 0.5920 ND 2.8100 ND 0.4870 0.0279 0.00504 8/23/2016 0.9570 0.0062 0.0208 ND ND ND ND ND ND 0.0006 ND ND 0.6180 0.0290 0.0504 0.4550 ND 4.1400 ND 0.3930 0.0228 0.004187 8/24/2016 0.3970 0.0030 0.0097 ND ND ND ND ND ND 0.0006 ND ND 0.2920 0.0157 0.0357 0.2220 ND 0.9910 ND 0.2290 0.0156 0.002559 8/25/2016 0.4850 0.0042 0.0119 ND ND ND ND ND ND 0.0007 ND ND 0.3740 0.0184 0.0452 0.2660 ND 1.2100 ND 0.2790 0.0201 0.003202 8/26/2016 1.6500 0.0104 0.0264 ND ND ND ND ND ND 0.0010 ND ND 1.0200 0.0426 0.0773 0.7420 ND 3.8000 ND 0.6430 0.0343 0.006665 8/27/2016 — — — — — — — — — — — — — — — — — — — — — — 8/31/2016 2.3200 0.0137 0.0594 ND ND ND ND ND ND 0.0009 ND ND 1.1400 0.0558 0.0599 0.8420 ND 4.7500 ND 0.7200 0.0259 0.006615 9/3/2016 1.1300 0.0066 0.0298 ND ND ND ND ND ND ND ND 0.7270 0.0361 0.0433 0.5460 ND 2.4000 ND 0.4350 0.0193 0.004099 9/6/2016 1.1400 0.0107 0.0256 ND ND ND ND ND ND ND 0.0004 ND ND 0.6970 0.0307 0.0430 0.4450 ND 2.3800 ND 0.3880 0.0191 0.003984 9/9/2016 0.8290 0.0061 0.0192 ND ND ND ND ND ND 0.0004 ND ND 0.4800 0.0252 0.0432 0.3710 ND 1.7800 ND 0.3530 0.0196 0.003585 9/12/2016 0.3570 0.0035 0.0080 ND ND ND ND ND ND ND ND ND 0.2270 0.0110 0.0162 0.1720 ND 1.3100 ND 0.1380 0.0068 0.001422 9/15/2016 9/18/2016 0.5480 0.5270 0.0043 0.0038 0.0164 0.0110 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 0.2970 0.2720 1.3700 0.9960 ND 0.2530 0.2270 0.0143 0.0087 0.002798 ND 0.0360 0.0204 ND ND 0.0214 0.0165 ND ND 0.3810 0.3440 0.0076 ND ND ND ND ND ND ND ND ND 0.1900 ND 1.1200 ND 0.1380 0.0064 0.001518 9/21/2016 0.4260 0.0027 0.2530 0.0113 0.0164 ND Data Quality Key Abbreviation Key Data met all QC and method criteria TEF = EPA Toxicity Equivalency Factor 0.001951 Page 24 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 Results estimated. Either below quantitation limit or because of issues during sampling or analysis ABC = DEQ Ambient Benchmark Criteria Data of unacceptable quality ND = Non-detect Coronene Dibenzo(a,h)anthracene 0.05 0.03 — 1.1 ABC — — — — — — — — — — — — — Total PAHs as TEF Chrysene 0.02 Pyrene Benzo(k)fluoranthene — Phenanthrene Benzo(g,h,i)perylene 0.1 Perylene Benzo(e)pyrene 1 Naphthalene Benzo(b)fluoranthene 0.005 Indeno(1,2,3-cd)pyrene Benzo(a)pyrene 0.0005 Fluorene Benzo(a)anthracene 0.001 Fluoranthene Anthracene 0.001 Dibenzothiophene Acenaphthylene TEF Dibenzofuran Acenaphthene STP = Standard temperature and pressure — — 0.05 0.001 0.1 — — 0.0005 0.001 — — — — — 0.03 — — — 0.0009 Wasco County Planning Building Sample Results (µg/m STP) 3 9/24/2016 0.4410 0.0034 0.0105 ND ND ND ND ND ND ND ND ND 0.2850 0.0150 0.0211 0.2150 ND 1.1400 ND 0.1730 0.0083 0.001815 9/27/2016 1.4700 0.0075 0.0356 ND ND ND ND ND ND 0.0007 ND ND 0.9460 0.0435 0.0534 0.7300 ND 2.2700 ND 0.4840 0.0253 0.005182 0.0277 ND ND ND ND ND ND ND 0.6800 ND 2.9800 ND 0.4860 0.0189 0.004766 ND ND ND ND ND 0.0005 ND ND ND ND 9/30/2016 1.5100 0.0069 0.9360 0.0375 0.0456 10/3/2016 0.7800 0.0049 0.0112 ND 0.4530 0.0167 0.0187 0.3100 ND 2.4300 ND 0.2090 0.0072 0.002147 10/6/2016 0.5290 0.0036 0.0107 ND ND ND ND ND ND ND ND ND 0.3120 0.0134 0.0179 0.2230 ND 1.5900 ND 0.1720 0.0068 0.001749 10/9/2016 0.9130 0.0046 0.0112 ND ND ND ND ND ND ND ND ND 0.3520 0.0168 0.0237 0.2480 ND 2.0800 ND 0.1880 0.0091 0.002459 0.0071 ND ND ND ND ND ND ND ND ND 0.1380 ND 1.7600 ND 0.0933 0.0047 0.001102 ND ND ND ND ND ND ND ND 10/12/2016 0.3610 0.0034 0.2010 0.0083 0.0109 10/15/2016 0.3290 0.0031 0.0051 ND 0.1810 0.0080 0.0112 0.1200 ND 1.1200 ND 0.0841 0.0045 0.001061 10/18/2016 0.9580 0.0061 0.0133 ND ND ND ND ND ND 0.0004 ND ND 0.4660 0.0169 0.0180 0.3110 ND 2.9000 ND 0.1910 0.0081 0.002297 10/21/2016 0.9360 0.0060 0.0111 ND ND ND ND ND ND ND 0.4260 0.0145 0.0154 0.2750 ND 3.2600 ND 0.1650 0.0068 0.002094 0.0080 ND ND ND ND ND 0.0004 ND ND ND ND ND 0.2010 ND 1.8300 ND 0.1320 0.0063 0.001519 ND ND ND ND ND ND ND ND 10/24/2016 0.5380 0.0037 0.3030 0.0108 0.0140 10/27/2016 0.3990 0.0043 0.0053 ND 0.2150 0.0086 0.0109 0.1290 ND 1.3600 ND 0.0929 0.0047 0.001131 10/30/2016 0.1500 0.0020 0.0026 ND ND ND ND ND ND ND ND ND 0.0843 0.0042 0.0049 0.0589 ND 0.3040 ND 0.0468 0.0025 0.000484 11/2/2016 0.7190 0.0067 0.0096 ND ND ND ND ND ND ND ND ND 0.3490 0.0149 0.0162 0.2270 ND 2.0500 ND 0.1500 0.0069 0.001849 0.0069 ND ND ND ND ND ND ND 1.4300 ND 0.1060 0.0050 0.001289 ND ND ND ND ND 0.0004 ND ND ND ND 11/8/2016 0.3270 0.0050 0.0066 ND 0.2040 0.0105 0.0127 0.1470 0.0004 ND 1.2600 ND 0.1090 0.0057 0.001177 11/11/2016 0.3740 0.0055 0.0061 ND ND ND ND ND ND 0.0004 ND ND 0.2020 0.0090 0.0101 0.1360 ND 0.9860 ND 0.0939 0.0051 0.001088 11/13/2016 0.4290 0.0073 0.0063 ND ND ND ND ND ND ND 0.2290 0.0099 0.0113 0.1560 ND 0.1070 0.0056 0.001275 0.0094 ND ND ND ND ND ND 0.2400 0.0004 ND 1.0900 ND 0.0004 ND ND ND 1.9400 ND 0.1600 0.0079 0.001825 ND ND ND ND ND ND ND ND 11/5/2016 11/14/2016 0.4590 0.6810 0.0081 0.0062 0.2460 0.3600 0.0098 0.0150 0.0109 0.0161 0.1610 11/15/2016 0.7620 0.0069 0.0079 ND 0.3890 0.0135 0.0121 0.2520 ND 2.2900 ND 0.1390 0.0060 0.001705 11/16/2016 0.3410 0.0036 0.0036 ND ND ND ND ND ND ND ND ND 0.1760 0.0057 0.0060 0.1120 ND 1.2500 ND 0.0628 0.0031 0.000795 11/17/2016 0.2350 0.0049 0.0039 ND ND ND ND ND ND 0.0004 ND ND 0.1250 0.0050 0.0054 0.0813 ND 1.1300 ND 0.0542 0.0028 0.000635 Page 25 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017 11/18/2016 0.1850 0.0025 0.0023 ND ND ND ND ND ND ND ND ND 0.0956 0.0031 0.0037 0.0572 ND 0.7490 ND 0.0345 0.0019 0.000450 11/19/2016 0.4270 0.0070 0.0065 ND ND ND ND ND ND 0.0005 ND ND 0.2070 0.0067 0.0065 0.1330 ND 1.7600 ND 0.0701 0.0033 0.000947 Data Quality Key Abbreviation Key Data met all QC and method criteria TEF = EPA Toxicity Equivalency Factor Results estimated. Either below quantitation limit or because of issues during sampling or analysis ABC = DEQ Ambient Benchmark Criteria Data of unacceptable quality ND = Non-detect STP = Standard temperature and pressure Page 26 The Dalles Area-wide Air Sampling FINAL Revision Date: 03/03/2017