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| 1 | Table 1: Monthly Siltronic Pre-Treatment Facility Groundwater Influent Concentrations Compared to No Longer | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 2 | Contained-In Threshold Values for F002 TCE Wastes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3 | F002 Constituent | Previous Threshold1 (ug/L) | Current Threshold2 (ug/L) | Monthly Siltronic Pre-Treatment System Groundwater Influent Concentrations (ug/L) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 4 | Jun-15 | Jul-15 | Aug-15 | Sep-15 | Oct-15 | Nov-15 | Dec-15 | Jan-16 | Feb-16 | Mar-16 | Apr-16 | May-16 | Jun-16 | Jul-16 | Aug-16 | Sep-16 | Oct-16 | Nov-16 | Dec-16 | Jan-17 | Feb-17 | Mar-17 | Apr-17 | May-17 | Jun-17 | Jul-17 | Aug-17 | Sep-17 | Oct-17 | Nov-17 | Dec-17 | Jan-18 | Feb-18 | Mar-18 | Apr-18 | May-18 | Jun-18 | Jul-18 | Aug-18 | Sep-18 | Oct-18 | Nov-18 | Dec-18 | Jan-19 | Feb-19 | Mar-19 | Apr-19 | May-19 | Jun-19 | Jul-19 | Aug-19 | Sep-19 | Oct-19 | Nov-19 | Dec-19 | Jan-20 | Feb-20 | Mar-20 | Apr-20 | May-20 | Jun-20 | Jul-20 | Aug-20 | Sep-20 | Oct-20 | Nov-20 | Dec-20 | Jan-21 | Feb-21 | Mar-21 | Apr-21 | May-21 | Jun-21 | Jul-21 | Aug-21 | Sep-21 | Oct-21 | Nov-21 | Dec-21 | Jan-22 | Feb-22 | Mar-22 | Apr-22 | May-22 | Jun-22 | Jul-22 | Aug-22 | Sep-22 | Oct-22 | Nov-22 | Dec-22 | Jan-23 | Feb-23 | Mar-23 | Apr-23 | May-23 | Jun-23 | Jul-23 | Aug-23 | Sep-23 | Oct-23 | Nov-23 | Dec-23 | Jan-24 | Feb-24 | Mar-24 | Apr-24 | May-24 | Jun-24 | |||
| 5 | Trichloroethene | 5 | 430 | 2.5U | 2.5U | 2.5U | 1.25U | 1.25U | 5.00U | 1.25U | 1.25U | 1.25U | 1.25U | - | - | - | 1.25U | 2.50U | 2.50U | 2.50U | 2.50U | 2.50U | 1.25U | 1.25U | 1.25U | 1.25U | 1.25U | 0.625U | 1.25U | 0.775J | 5.00U | 1.25U | 1.00U | 1.00U | 1.00U | 0.500U | 2.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 2.00U | 2.00U | 1.00U | 1.00U | 2.00U | 1.00U | 1.00U | 1.00U | 8.00U | 4.00U | 1.00U | 4.00U | 4.00U | 4.00U | 4.00U | 4.00U | 4.00U | 2.00U | 0.400U | 4.00U | 4.00U | 2.00U | 2.00U | 1.00U | 4.00U | 0.330J | 2.00U | 2.00U | 1.00U | 0.360J | 0.330J | 0.258J | 1.00U | 0.250J | 0.283J | 0.333J | 2.00U | 2.00U | 2.00U | 1.00U | 1.00U | 1.00U | 2.00U | 1.00U | 0.500U | 1.00U | 1.00U | 1.00U | 2.00U | 1.00U | 2.00U | 1.00U | 1.00U | 1.25U | 1.00U | 1.00U | 2.00U | 2.00U | 0.800U | 0.240J | 0.400 U | 1.00U | 1.00U | 1.00U | 4.00U |
| 6 | Cis-1,2-Dichloroethene (DCE) | 70 | 18,000 | 163 | 387 | 358 | 301 | 354 | 41 | 291 | 223 | 232 | 201 | - | - | - | 116 | 55.9 | 114 | 45.2 | 18.4 | 25.5 | 29.4 | 82.0 | 40.1 | 49.1 | 30.2 | 78.7 | 65.6 | 83.4 | 42.6 | 47.5 | 26.4 | 32.0 | 23.8 | 26.3 | 24.4 | 17.8 | 43.0 | 16.3 | 20.4 | 14.1 | 15.9 | 18.7 | 18.7 | 13.7 | 16.7 | 11.2 | 12.6 | 14.5 | 9.4 | 11.8 | 7.6 | 6.99 | 7.55 | 7.70J | 5.40 | 3.55 | 5.06 | 5.80J | 7.90J | 5.00J | 6.40J | 5.02J | 4.46 | 4.24 | 6.32J | 4.00U | 3.50J | 4.52 | 5.09 | 4.00U | 3.43 | 6.10 | 2.06J | 2.80 | 3.44 | 3.43 | 4.26 | 5.00 | 4.35 | 3.70 | 4.90 | 5.40 | 6.60 | 5.00 | 5.40 | 5.10 | 6.05 | 5.50 | 6.30 | 4.35 | 4.30 | 4.50 | 2.15 | 4.6 | 4.1 | 3.20J | 2.6 | 4.1 | 2.55 | 2.70 | 2.55 | 2.90J | 5.70 | 1.52 | 4.62 | 2.88 | 3.3 | 2.4 | 1.85J | 4.00U |
| 7 | Trans-1,2-DCE | 100 | 180,000 | 2.7J | 6.9 | 5.6 | 7.7 | 6.35 | 0.49J | 5.73 | 5.49 | 3.80 | 3.15 | - | - | - | 1.25J | 2.50U | 2.50U | 2.50U | 2.50U | 2.50U | 1.25U | 1.25U | 1.25U | 1.25U | 1.25U | 0.625U | 1.25U | 0.625U | 5.00U | 1.25U | 1.00U | 1.00U | 1.00U | 0.500U | 2.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 2.00U | 2.00U | 1.00U | 1.00U | 2.00U | 1.00U | 1.00U | 1.00U | 4.00U | 4.00U | 1.00U | 4.00U | 4.00U | 4.00U | 4.00U | 4.00U | 4.00U | 2.00U | 0.400U | 4.00U | 4.00U | 2.00U | 2.00U | 1.00U | 4.00U | 0.200U | 2.00U | 2.00U | 1.00U | 0.200U | 0.200U | 0.200U | 1.00U | 0.200U | 0.200U | 0.200U | 2.00U | 2.00U | 2.00U | 1.00U | 1.00U | 1.00U | 2.00U | 1.00U | 0.500U | 1.00U | 1.00U | 1.00U | 2.00U | 1.00U | 2.00U | 1.00U | 1.00U | 1.25U | 2.50U | 1.00U | 2.00U | 2.00U | 0.400U | 0.340J | 0.400U | 1.00U | 1.00U | 1.00U | 4.00U |
| 8 | 1,1-DCE | 7 | 44,000 | 2.5U | 2.5U | 2.5U | 2.5U | 1.25U | 5.00U | 1.25U | 1.25U | 1.25U | 1.25U | - | - | - | 1.25U | 2.50U | 2.50U | 2.50U | 2.50U | 2.50U | 1.25U | 1.25U | 1.25U | 1.25U | 1.25U | 0.625U | 1.25U | 0.625U | 5.00U | 1.25U | 1.00U | 1.00U | 1.00U | 0.500U | 2.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 1.00U | 2.00U | 2.00U | 1.00U | 1.00U | 2.00U | 1.00U | 1.00U | 1.00U | 4.00U | 4.00U | 1.00U | 4.00U | 4.00U | 4.00U | 4.00U | 4.00U | 4.00U | 2.00U | 0.400U | 4.00U | 4.00U | 2.00U | 2.00U | 1.00U | 4.00U | 0.200U | 2.00U | 2.00U | 1.00U | 0.200U | 0.200U | 0.200U | 1.00U | 0.200U | 0.200U | 0.200U | 2.00U | 2.00U | 2.00U | 1.00U | 1.00U | 1.00U | 2.00U | 1.00U | 0.500U | 1.00U | 1.00U | 1.00U | 2.00U | 1.00U | 2.00U | 1.00U | 1.00U | 1.25U | 2.50U | 1.00U | 2.00U | 2.00U | 0.400U | 0.200U | 0.400U | 1.00U | 1.00U | 1.00U | 4.00U |
| 9 | Vinyl Chloride | 2 | 960 | 41.4 | 95.3 | 67.3 | 71.3 | 87.2 | 75.6 | 91.7 | 72.5 | 80.9 | 77.8 | - | - | - | 68.4 | 34.3 | 74.1 | 39.6 | 22.0 | 33.0 | 32.1 | 58.3 | 32.2 | 50.9 | 33.0 | 58.7 | 66.4 | 56.6 | 30.6 | 44.5 | 21.3 | 36.4 | 21.8 | 23.8 | 30.8 | 15.1 | 45.1 | 13.4 | 21.5 | 8.64 | 15.2 | 30.5 | 20.2 | 13.2 | 18.9 | 11.0 | 11.0 | 13.7 | 10.2 | 19.5 | 11.80 | 9.60 | 12.7 | 16.4 | 8.16 | 7.90 | 20.4 | 9.40 | 9.60 | 9.76 | 6.60J | 10.1 | 7.94 | 4.90 | 6.04J | 4.00U | 4.50 | 7.79 | 5.34 | 4.96J | 4.83 | 5.80 | 5.10 | 5.25 | 7.84 | 9.07 | 8.95 | 4.85 | 10.4 | 7.42 | 11.9 | 11.8 | 14.5 | 8.40 | 9.45 | 10.8 | 12.4 | 8.60 | 8.15 | 12.2 | 11.1 | 8.95 | 3.90 | 6.60 | 5.00 | 9.20 | 3.85 | 2.55 | 6.20 | 4.95 | 6.15 | 5.70 | 4.20 | 4.48 | 5.24 | 3.50 | 5.25 | 4.75 | 4.85 | 5.20 |
| 10 | Notes: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 11 | 1 = Federal Safe Drinking Water Act Maximum Contaminant Levels (MCLs), as included within the existing Draft Contaminated Media Management Plan, NW Natural | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 12 | Gasco Site, dated November 19, 2021 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 13 | 2 = Oregon Department of Environmental Quality (DEQ) Construction and Excavation Worker Risk-Based Concentrations (RBCs), Revised August 2023 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 14 | U = Not detected above concentration listed | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 15 | ug/L = micrograms per liter | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||