Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Substitution of ND at 1/2 DLa

Total PCBs Open Space (Forest Park)OF22C 2 1 50 53.5 53.5 26.2 80.8 pg/L Residential OF49 2 0 100 1180 1180 1140 1220 pg/L >64 Major Transportation H30 1 0 100 17500 17500 17500 17500 pg/L SJB 4 0 100 86300 75900 8500 185000 pg/L Open Space/Heavy Ind. OF18 4 0 100 17800099200 12300 503000 pg/L OF19 3 0 100 34600 25000 11100 67700 pg/L Light Industrial OFM1 3 0 100 10110 9040 3490 17800 pg/L OFM2 4 0 100 8960 7520 1700 19100 pg/L Heavy Industrial OF16 3 0 100 14600011700088500 232000 pg/L OF22 4 0 100 24295 23100 9380 41600 pg/L OF22B 3 0 100 13800014300027800 244000 pg/L WR218 2 0 100 34850 34900 17600 52100 pg/L WR67 4 0 100 1689 732 344 4950 pg/L Arkema WR96 2 0 100 12250 8340 8210 20200 pg/L Chevron - TransportationWR14 3 0 100 5697 5520 971 10600 pg/L GASCO WR107 4 0 100 2495 2525 510 4420 pg/L Gunderson WR142 2 0 100 1226 1226 852 1600 pg/L WR147 3 0 100 6580004280002370001310000 pg/L OSM WR22 4 0 100 278000272000243000325000 pg/L Portland Shipyard WR161 5 0 100 125000119000 1400 302000 pg/L Schnitzer - Riverside WR384 4 0 100 5125000440000010000011600000pg/L Schnitzer International SlipWR123 4 0 100 27700025600056700 539000 pg/L Sulzer Pump WR4 3 0 100 8593 4860 4820 16100 pg/L Total suspended solids Open Space (Forest Park)OF22C 2 0 100 10.0 10.0 10.0 10.0 mg/L Residential OF49 3 0 100 20.7 16.0 8.0 38.0 mg/L Major Transportation H30 3 0 100 46.7 47.0 33.0 60.0 mg/L SJB 7 0 100 112 85.0 13.0 248 mg/L Open Space/Heavy Ind. OF18 5 0 100 115 113 17.0 212 mg/L OF19 5 0 100 103 81.0 34.0 191 mg/L Light Industrial OFM1 4 0 100 67.0 62.5 46.0 97.0 mg/L OFM2 4 0 100 51.3 46.5 31.0 81.0 mg/L Heavy Industrial OF16 5 0 100 89.4 78.0 34.0 171 mg/L OF22 4 0 100 176 143 69.0 351 mg/L OF22B 3 0 100 220 229 164 266 mg/L WR218 2 0 100 52.5 52.5 28.0 77.0 mg/L WR67 6 0 100 27.5 18.5 6.0 59.0 mg/L Arkema WR96 5 0 100 12.0 11.0 5.0 20.0 mg/L Chevron - TransportationWR14 5 0 100 38.4 42.0 12.0 51.0 mg/L GASCO WR107 5 0 100 24.0 26.0 10.0 36.0 mg/L Gunderson WR142 2 0 100 11.5 11.5 8.0 15.0 mg/L WR145 1 0 100 9.0 9.0 9.0 9.0 mg/L WR147 5 0 100 48.2 28.0 15.0 119 mg/L OSM WR22 5 0 100 208 146 128 401 mg/L Portland Shipyard WR161 6 0 100 80.3 39.5 8.0 256 mg/L Schnitzer - Riverside WR384 5 0 100 264 167 6.0 780 mg/L Schnitzer International SlipWR123 6 0 100 231 230 58.0 414 mg/L Sulzer Pump WR4 4 0 100 14.0 13.5 5.0 24.0 mg/L

Page 1of11Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Substitution of ND at 1/2 DLa

Total organic carbon Open Space (Forest Park)OF22C 2 0 100 3.1 3.1 2.8 3.3 mg/L Residential OF49 3 0 100 9.4 6.8 5.7 15.6 mg/L Major Transportation H30 3 0 100 19.9 15.7 13.5 30.6 mg/L SJB 7 0 100 21.9 22.3 3.9 39.5 mg/L Open Space/Heavy Ind. OF18 5 0 100 10.1 7.8 4.3 19.0 mg/L OF19 5 0 100 6.4 5.9 4.1 10.1 mg/L Light Industrial OFM1 4 0 100 11.1 12.1 6.1 14.1 mg/L OFM2 4 0 100 6.7 5.8 3.2 11.8 mg/L Heavy Industrial OF16 4 0 100 10.3 8.4 6.7 17.5 mg/L OF22 4 0 100 22.8 12.1 7.1 60.0 mg/L OF22B 3 0 100 26.0 28.3 14.1 35.6 mg/L WR218 2 0 100 14.3 14.3 7.1 21.5 mg/L WR67 6 0 100 9.2 8.7 4.3 15.4 mg/L Arkema WR96 5 0 100 11.4 7.5 4.5 30.8 mg/L Chevron - TransportationWR14 5 0 100 10.3 6.4 4.1 23.6 mg/L GASCO WR107 5 0 100 4.2 4.2 2.9 5.6 mg/L Gunderson WR142 2 0 100 17.4 17.4 12.0 22.7 mg/L WR145 1 0 100 8.1 8.1 8.1 8.1 mg/L WR147 5 0 100 15.2 11.7 5.5 38.6 mg/L OSM WR22 5 0 100 5.8 6.0 3.2 8.2 mg/L Portland Shipyard WR161 6 0 100 50.1 13.8 4.1 144 mg/L Schnitzer - Riverside WR384 5 0 100 27.2 23.7 21.7 42.3 mg/L Schnitzer International SlipWR123 6 0 100 14.6 13.1 8.8 27.5 mg/L Sulzer Pump WR4 4 0 100 6.2 5.2 2.9 11.4 mg/L Total of 2,4' and 4,4'-DDD, -DDE, -DDTHeavy Industrial OF22B 3 0 100 97.7 71.0 12.0 210 mg/L Arkema WR96 4 0 100 4300 2650 900 11000 ng/L Low Molecular Weight PAH Open Space (Forest Park)OF22C 2 2 0 0.00800.00800.0075 0.0085 ng/L Residential OF49 3 1 67 0.017 0.019 0.0095 0.021 ug/L Major Transportation H30 3 0 100 0.099 0.076 0.071 0.15 ug/L SJB 4 0 100 1.4 0.67 0.31 4.1 ug/L Open Space/Heavy Ind. OF18 4 0 100 0.16 0.072 0.0084 0.47 ug/L OF19 3 0 100 0.15 0.15 0.100 0.19 ug/L Light Industrial OFM1 3 0 100 0.33 0.32 0.20 0.46 ug/L OFM2 4 0 100 0.086 0.086 0.053 0.12 ug/L Heavy Industrial OF16 3 0 100 0.32 0.31 0.20 0.44 ug/L OF22 4 0 100 0.82 0.17 0.040 2.9 ug/L OF22B 3 0 100 1.8 0.59 0.51 4.3 ug/L WR218 2 0 100 0.12 0.12 0.097 0.14 ug/L WR67 4 0 100 0.099 0.085 0.067 0.16 ug/L Arkema WR96 4 0 100 0.013 0.013 0.0067 0.018 ug/L Chevron - TransportationWR14 3 0 100 0.44 0.45 0.19 0.69 ug/L GASCO WR107 4 0 100 0.85 0.46 0.20 2.3 ug/L Gunderson WR142 2 1 50 0.091 0.091 0.0025 0.18 ug/L WR145 1 0 100 0.20 0.20 0.20 0.20 ug/L WR147 3 0 100 0.17 0.21 0.092 0.22 ug/L OSM WR22 4 0 100 0.30 0.19 0.13 0.68 ug/L Portland Shipyard WR161 5 0 100 0.17 0.21 0.042 0.22 ug/L Schnitzer - Riverside WR384 3 1 67 1.08 1.4 0.046 1.8 ug/L Schnitzer International SlipWR123 4 0 100 0.25 0.16 0.062 0.64 ug/L Sulzer Pump WR4 3 0 100 0.087 0.087 0.087 0.087 ug/L

Page 2of11Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Substitution of ND at 1/2 DLa

High Molecular Weight PAH Open Space (Forest Park)OF22C 2 2 0 0.00280.00280.0027 0.0028 ug/L Residential OF49 3 0 100 0.075 0.071 0.055 0.100 ug/L Major Transportation H30 3 0 100 0.47 0.32 0.20 0.88 ug/L SJB 4 0 100 3.4 2.3 0.85 8.1 ug/L Open Space/Heavy Ind. OF18 4 0 100 0.79 0.50 0.075 2.1 ug/L OF19 3 0 100 0.81 0.83 0.65 0.95 ug/L Light Industrial OFM1 3 0 100 1.1 1.2 0.89 1.2 ug/L OFM2 4 0 100 0.38 0.31 0.21 0.68 ug/L Heavy Industrial OF16 3 0 100 0.58 0.69 0.28 0.78 ug/L OF22 4 0 100 0.96 0.88 0.48 1.6 ug/L OF22B 3 0 100 0.90 0.64 0.57 1.5 ug/L WR218 2 0 100 0.37 0.37 0.35 0.38 ug/L WR67 4 0 100 0.53 0.52 0.24 0.86 ug/L Arkema WR96 4 0 100 0.044 0.042 0.038 0.054 ug/L Chevron - TransportationWR14 3 0 100 4.7 4.7 1.2 8.1 ug/L GASCO WR107 4 0 100 4.9 4.1 1.8 9.7 ug/L Gunderson WR142 2 0 100 0.34 0.34 0.17 0.51 ug/L WR145 1 0 100 0.70 0.70 0.70 0.70 ug/L WR147 3 0 100 0.28 0.36 0.13 0.36 ug/L OSM WR22 4 0 100 0.55 0.54 0.29 0.83 ug/L Portland Shipyard WR161 5 0 100 0.47 0.53 0.076 0.90 ug/L Schnitzer - Riverside WR384 3 0 100 13.5 11.0 0.35 29.0 ug/L Schnitzer International SlipWR123 4 0 100 0.84 0.79 0.37 1.4 ug/L Sulzer Pump WR4 3 0 100 0.16 0.12 0.056 0.31 ug/L Total PAHs Open Space (Forest Park)OF22C 2 2 0 0.00800.00800.0075 0.0085 ug/L Residential OF49 3 0 100 0.089 0.092 0.074 0.100 ug/L Major Transportation H30 3 0 100 0.56 0.39 0.28 1.00 ug/L SJB 4 0 100 4.8 2.9 1.2 12.0 ug/L Open Space/Heavy Ind. OF18 4 0 100 0.96 0.58 0.083 2.6 ug/L OF19 3 0 100 0.94 0.98 0.75 1.1 ug/L Light Industrial OFM1 3 0 100 1.4 1.5 1.10 1.6 ug/L OFM2 4 0 100 0.46 0.39 0.26 0.80 ug/L Heavy Industrial OF16 3 0 100 0.90 0.98 0.71 1.00 ug/L OF22 4 0 100 1.8 1.04 0.52 4.5 ug/L OF22B 3 0 100 2.7 2.1 1.2 4.9 ug/L WR218 2 0 100 0.48 0.48 0.44 0.52 ug/L WR67 4 0 100 0.63 0.60 0.31 1.00 ug/L Arkema WR96 4 0 100 0.056 0.053 0.048 0.072 ug/L Chevron - TransportationWR14 3 0 100 5.1 5.1 1.4 8.8 ug/L GASCO WR107 4 0 100 5.8 4.5 2.0 12.0 ug/L Gunderson WR142 2 0 100 0.43 0.43 0.17 0.69 ug/L WR145 1 0 100 0.90 0.90 0.90 0.90 ug/L WR147 3 0 100 0.45 0.56 0.22 0.58 ug/L OSM WR22 4 0 100 0.84 0.72 0.42 1.5 ug/L Portland Shipyard WR161 5 0 100 0.64 0.71 0.12 1.1 ug/L Schnitzer - Riverside WR384 3 0 100 14.1 12.0 0.35 30.0 ug/L Schnitzer International SlipWR123 4 0 100 1.1 1.1 0.44 1.7 ug/L Sulzer Pump WR4 3 0 100 0.25 0.21 0.14 0.40 ug/L

Page 3of11Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Substitution of ND at 1/2 DLa

Arsenic Open Space (Forest Park)OF22C 2 0 100 0.20 0.20 0.20 0.20 ug/L Residential OF49 3 0 100 0.34 0.29 0.26 0.47 ug/L >0.14 Major Transportation H30 3 0 100 0.50 0.49 0.49 0.53 ug/L SJB 4 0 100 0.88 0.86 0.82 0.98 ug/L Open Space/Heavy Ind. OF18 4 0 100 1.7 1.7 1.4 1.8 ug/L OF19 4 0 100 1.5 1.6 0.77 2.2 ug/L Light Industrial OFM1 4 0 100 0.93 0.94 0.72 1.1 ug/L OFM2 4 0 100 1.6 1.5 0.99 2.3 ug/L Heavy Industrial OF16 5 0 100 0.63 0.71 0.34 0.79 ug/L OF22 3 0 100 3.3 3.6 2.4 4.0 ug/L OF22B 2 0 100 4.9 4.9 4.0 5.8 ug/L WR218 2 0 100 1.1 1.1 0.94 1.3 ug/L WR67 5 0 100 0.31 0.23 0.13 0.59 ug/L Arkema WR96 4 0 100 17.9 17.5 16.9 19.8 ug/L Chevron - TransportationWR14 5 0 100 0.51 0.54 0.27 0.71 ug/L GASCO WR107 4 0 100 0.76 0.72 0.27 1.3 ug/L Gunderson WR142 1 0 100 0.87 0.87 0.87 0.87 ug/L WR145 1 1 0 0.00350.00350.0035 0.0035 ug/L WR147 5 0 100 0.68 0.63 0.38 1.07 ug/L OSM WR22 4 0 100 6.6 6.9 4.2 8.4 ug/L Portland Shipyard WR161 4 0 100 1.5 1.5 1.10 1.8 ug/L Schnitzer - Riverside WR384 4 0 100 2.0 1.9 1.5 2.9 ug/L Schnitzer International SlipWR123 4 0 100 8.2 8.0 2.7 14.3 ug/L Sulzer Pump WR4 4 0 100 0.29 0.27 0.21 0.42 ug/L Lead Open Space (Forest Park)OF22C 2 0 100 0.42 0.42 0.40 0.44 ug/L Residential OF49 3 0 100 2.8 2.8 1.4 4.3 ug/L >0.54 Major Transportation H30 3 0 100 8.6 7.1 5.4 13.2 ug/L SJB 4 0 100 39.6 30.0 23.2 75.2 ug/L Open Space/Heavy Ind. OF18 4 0 100 44.5 39.3 23.2 76.3 ug/L OF19 4 0 100 21.8 17.9 10.4 41.0 ug/L Light Industrial OFM1 4 0 100 8.8 4.8 4.2 21.4 ug/L OFM2 4 0 100 4.7 3.8 2.9 8.4 ug/L Heavy Industrial OF16 5 0 100 30.4 22.4 13.4 55.4 ug/L OF22 3 0 100 16.4 14.7 9.7 24.7 ug/L OF22B 2 0 100 148 148 101 195 ug/L WR218 2 0 100 12.6 12.6 5.7 19.5 ug/L WR67 5 0 100 3.4 1.7 0.62 9.3 ug/L Arkema WR96 4 0 100 12.7 13.5 8.5 15.3 ug/L Chevron - TransportationWR14 5 0 100 7.0 6.7 2.6 11.4 ug/L GASCO WR107 4 0 100 4.9 4.5 2.8 7.8 ug/L Gunderson WR142 1 0 100 1.2 1.2 1.2 1.2 ug/L WR145 1 0 100 7.0 7.0 7.0 7.0 ug/L WR147 5 0 100 63.3 34.8 14.6 143 ug/L OSM WR22 4 0 100 48.3 49.0 39.1 56.1 ug/L Portland Shipyard WR161 4 0 100 27.8 14.8 11.4 70.0 ug/L Schnitzer - Riverside WR384 4 0 100 377 433 6.2 635 ug/L Schnitzer International SlipWR123 4 0 100 41.7 38.6 17.7 71.8 ug/L Sulzer Pump WR4 4 0 100 6.3 5.1 1.9 13.0 ug/L

Page 4of11Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Substitution of ND at 1/2 DLa

Mercury Open Space (Forest Park)OF22C 2 2 0 0.015 0.015 0.015 0.015 ug/L Residential OF49 3 3 0 0.015 0.015 0.015 0.015 ug/L >0.77 Major Transportation H30 3 2 33 0.025 0.030 0.015 0.030 ug/L SJB 4 3 25 0.030 0.025 0.010 0.060 ug/L Open Space/Heavy Ind. OF18 4 1 75 0.035 0.040 0.020 0.040 ug/L OF19 4 4 0 0.021 0.015 0.010 0.045 ug/L Light Industrial OFM1 4 4 0 0.014 0.015 0.010 0.015 ug/L OFM2 4 4 0 0.019 0.015 0.015 0.030 ug/L Heavy Industrial OF16 5 3 40 0.033 0.040 0.015 0.045 ug/L OF22 3 2 33 0.032 0.040 0.015 0.040 ug/L OF22B 2 0 100 0.55 0.55 0.21 0.89 ug/L WR218 2 2 0 0.023 0.023 0.015 0.030 ug/L WR67 5 5 0 0.017 0.015 0.015 0.025 ug/L Arkema WR96 4 1 75 0.25 0.23 0.19 0.36 ug/L Chevron - TransportationWR14 5 5 0 0.017 0.015 0.010 0.030 ug/L GASCO WR107 4 4 0 0.015 0.015 0.010 0.020 ug/L Gunderson WR142 1 1 0 0.015 0.015 0.015 0.015 ug/L WR145 1 1 0 0.015 0.015 0.015 0.015 ug/L WR147 5 4 20 0.040 0.015 0.015 0.085 ug/L OSM WR22 4 1 75 0.084 0.093 0.050 0.100 ug/L Portland Shipyard WR161 4 3 25 0.024 0.023 0.010 0.040 ug/L Schnitzer - Riverside WR384 4 0 100 0.87 0.81 0.080 1.8 ug/L Schnitzer International SlipWR123 4 3 25 0.041 0.035 0.015 0.080 ug/L Sulzer Pump WR4 4 4 0 0.016 0.015 0.010 0.025 ug/L 2,4-D Open Space (Forest Park)OF22C 2 2 0 0.018 0.018 0.017 0.018 ug/L Residential OF49 2 0 100 1.2 1.2 0.34 2.0 ug/L >70 Major Transportation H30 2 1 50 0.21 0.21 0.20 0.22 ug/L SJB 4 3 25 0.39 0.20 0.085 1.1 ug/L Open Space/Heavy Ind. OF18 4 2 50 0.067 0.076 0.017 0.097 ug/L OF19 4 1 75 0.090 0.076 0.057 0.15 ug/L Light Industrial OFM1 3 1 67 0.106 0.11 0.017 0.19 ug/L OFM2 3 0 100 0.46 0.19 0.083 1.1 ug/L Heavy Industrial OF16 3 0 100 0.33 0.28 0.058 0.64 ug/L OF22 3 2 33 0.38 0.18 0.018 0.94 ug/L OF22B 3 0 100 1.9 0.78 0.76 4.1 ug/L WR218 1 0 100 16.0 16.0 16.0 16.0 ug/L WR67 2 2 0 0.11 0.11 0.050 0.17 ug/L Arkema WR96 2 2 0 0.19 0.19 0.19 0.19 ug/L Chevron - TransportationWR14 3 3 0 0.13 0.19 0.018 0.19 ug/L GASCO WR107 4 4 0 0.32 0.059 0.018 1.2 ug/L Gunderson WR142 2 2 0 0.13 0.13 0.085 0.18 ug/L WR147 2 2 0 0.18 0.18 0.17 0.18 ug/L OSM WR22 4 4 0 0.036 0.018 0.017 0.090 ug/L Portland Shipyard WR161 5 5 0 0.48 0.19 0.018 1.8 ug/L Schnitzer - Riverside WR384 3 0 100 1.01 1.2 0.64 1.2 ug/L Schnitzer International SlipWR123 4 1 75 0.21 0.20 0.13 0.30 ug/L Sulzer Pump WR4 3 1 67 0.076 0.100 0.017 0.11 ug/L Total Phthalates Open Space (Forest Park)OF22C 2 1 50 0.14 0.14 0.044 0.23 ug/L Residential OF49 2 0 100 2.0 2.0 1.3 2.7 ug/L >3 Major Transportation SJB 4 0 100 13.8 15.5 3.2 21.0 ug/L Open Space/Heavy Ind. OF18 4 0 100 6.3 6.4 2.3 10.0 ug/L Light Industrial OFM2 4 0 100 3.1 2.5 1.9 5.5 ug/L Arkema WR96 4 1 75 0.31 0.30 0.035 0.59 ug/L Gunderson WR142 2 0 100 0.66 0.66 0.48 0.84 ug/L WR147 3 0 100 3.2 2.3 2.1 5.1 ug/L OSM WR22 4 0 100 1.2 1.1 0.072 2.4 ug/L Portland Shipyard WR161 5 0 100 2.5 1.3 0.34 7.4 ug/L Schnitzer International SlipWR123 3 1 67 2.5 2.4 0.17 4.8 ug/L

Page 5of11Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Substitution of ND at 0b

Total PCBs Open Space (Forest Park)OF22C 2 1 50 40.4 40.4 0 80.8 pg/L Residential OF49 2 0 100 1180 1180 1140 1220 pg/L Major Transportation H30 1 0 100 17500 17500 17500 17500 pg/L SJB 4 0 100 86300 75900 8500 185000 pg/L Open Space/Heavy Ind. OF18 4 0 100 17800099200 12300 503000 pg/L OF19 3 0 100 34600 25000 11100 67700 pg/L Light Industrial OFM1 3 0 100 10110 9040 3490 17800 pg/L OFM2 4 0 100 8960 7520 1700 19100 pg/L Heavy Industrial OF16 3 0 100 14600011700088500 232000 pg/L OF22 4 0 100 24295 23100 9380 41600 pg/L OF22B 3 0 100 13800014300027800 244000 pg/L WR218 2 0 100 34850 34900 17600 52100 pg/L WR67 4 0 100 1689 732 344 4950 pg/L Arkema WR96 3 0 100 12250 8340 8210 20200 pg/L Chevron - TransportationWR14 3 0 100 5697 5520 971 10600 pg/L GASCO WR107 4 0 100 2495 2525 510 4420 pg/L Gunderson WR142 2 0 100 1226 1226 852 1600 pg/L WR147 3 0 100 6580004280002370001310000 pg/L OSM WR22 4 0 100 278000272000243000325000 pg/L Portland Shipyard WR161 5 0 100 125000119000 1400 302000 pg/L Schnitzer - Riverside WR384 4 0 100 5125000440000010000011600000pg/L Schnitzer International SlipWR123 4 0 100 27700025600056700 539000 pg/L Sulzer Pump WR4 3 0 100 8593 4860 4820 16100 pg/L Total suspended solids Open Space (Forest Park)OF22C 2 0 100 10.0 10.0 10.0 10.0 mg/L Residential OF49 3 0 100 20.7 16.0 8.0 38.0 mg/L Major Transportation H30 3 0 100 46.7 47.0 33.0 60.0 mg/L SJB 7 0 100 112 85.0 13.0 248 mg/L Open Space/Heavy Ind. OF18 5 0 100 115 113 17.0 212 mg/L OF19 5 0 100 103 81.0 34.0 191 mg/L Light Industrial OFM1 4 0 100 67.0 62.5 46.0 97.0 mg/L OFM2 4 0 100 51.3 46.5 31.0 81.0 mg/L Heavy Industrial OF16 5 0 100 89.4 78.0 34.0 171 mg/L OF22 4 0 100 176 143 69.0 351 mg/L OF22B 3 0 100 220 229 164 266 mg/L WR218 2 0 100 52.5 52.5 28.0 77.0 mg/L WR67 6 0 100 27.5 18.5 6.0 59.0 mg/L Arkema WR96 5 0 100 12.0 11.0 5.0 20.0 mg/L Chevron - TransportationWR14 5 0 100 38.4 42.0 12.0 51.0 mg/L GASCO WR107 5 0 100 24.0 26.0 10.0 36.0 mg/L Gunderson WR142 2 0 100 11.5 11.5 8.0 15.0 mg/L WR145 1 0 100 9.0 9.0 9.0 9.0 mg/L WR147 5 0 100 48.2 28.0 15.0 119 mg/L OSM WR22 5 0 100 208 146 128 401 mg/L Portland Shipyard WR161 6 0 100 80.3 39.5 8.0 256 mg/L Schnitzer - Riverside WR384 5 0 100 264 167 6.0 780 mg/L Schnitzer International SlipWR123 6 0 100 231 230 58.0 414 mg/L Sulzer Pump WR4 4 0 100 14.0 13.5 5.0 24.0 mg/L

Page 6of11Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Substitution of ND at 0b

Total organic carbon Open Space (Forest Park)OF22C 2 0 100 3.1 3.1 2.8 3.3 mg/L Residential OF49 3 0 100 9.4 6.8 5.7 15.6 mg/L Major Transportation H30 3 0 100 19.9 15.7 13.5 30.6 mg/L SJB 7 0 100 21.9 22.3 3.9 39.5 mg/L Open Space/Heavy Ind. OF18 5 0 100 10.1 7.8 4.3 19.0 mg/L OF19 5 0 100 6.4 5.9 4.1 10.1 mg/L Light Industrial OFM1 4 0 100 11.1 12.1 6.1 14.1 mg/L OFM2 4 0 100 6.7 5.8 3.2 11.8 mg/L Heavy Industrial OF16 4 0 100 10.3 8.4 6.7 17.5 mg/L OF22 4 0 100 22.8 12.1 7.1 60.0 mg/L OF22B 3 0 100 26.0 28.3 14.1 35.6 mg/L WR218 2 0 100 14.3 14.3 7.1 21.5 mg/L WR67 6 0 100 9.2 8.7 4.3 15.4 mg/L Arkema WR96 5 0 100 11.4 7.5 4.5 30.8 mg/L Chevron - TransportationWR14 5 0 100 10.3 6.4 4.1 23.6 mg/L GASCO WR107 5 0 100 4.2 4.2 2.9 5.6 mg/L Gunderson WR142 2 0 100 17.4 17.4 12.0 22.7 mg/L WR145 1 0 100 8.1 8.1 8.1 8.1 mg/L WR147 5 0 100 15.2 11.7 5.5 38.6 mg/L OSM WR22 5 0 100 5.8 6.0 3.2 8.2 mg/L Portland Shipyard WR161 6 0 100 50.1 13.8 4.1 144 mg/L Schnitzer - Riverside WR384 5 0 100 27.2 23.7 21.7 42.3 mg/L Schnitzer International SlipWR123 6 0 100 14.6 13.1 8.8 27.5 mg/L Sulzer Pump WR4 4 0 100 6.2 5.2 2.9 11.4 mg/L Total of 2,4' and 4,4'-DDD, -DDE, -DDTHeavy Industrial OF22B 3 0 100 97.7 71.0 12.0 210 ng/L Arkema WR96 4 0 100 4300 2650 900 11000 ng/L Low Molecular Weight PAH Open Space (Forest Park)OF22C 2 2 0 0 0 0 0 ug/L Residential OF49 3 1 67 0.013 0.019 0 0.021 ug/L Major Transportation H30 3 0 100 0.099 0.076 0.071 0.15 ug/L SJB 4 0 100 1.4 0.67 0.31 4.1 ug/L Open Space/Heavy Ind. OF18 4 0 100 0.16 0.072 0.0084 0.47 ug/L OF19 3 0 100 0.15 0.15 0.100 0.19 ug/L Light Industrial OFM1 3 0 100 0.33 0.32 0.20 0.46 ug/L OFM2 4 0 100 0.086 0.086 0.053 0.12 ug/L Heavy Industrial OF16 3 0 100 0.32 0.31 0.20 0.44 ug/L OF22 4 0 100 0.82 0.17 0.040 2.9 ug/L OF22B 3 0 100 1.8 0.59 0.51 4.3 ug/L WR218 2 0 100 0.12 0.12 0.097 0.14 ug/L WR67 4 0 100 0.099 0.085 0.067 0.16 ug/L Arkema WR96 4 0 100 0.013 0.013 0.0067 0.018 ug/L Chevron - TransportationWR14 3 0 100 0.44 0.45 0.19 0.69 ug/L GASCO WR107 4 0 100 0.85 0.46 0.20 2.3 ug/L Gunderson WR142 2 1 50 0.090 0.090 0 0.18 ug/L WR145 1 0 100 0.20 0.20 0.20 0.20 ug/L WR147 3 0 100 0.17 0.21 0.092 0.22 ug/L OSM WR22 4 0 100 0.30 0.19 0.13 0.68 ug/L Portland Shipyard WR161 5 0 100 0.17 0.21 0.042 0.22 ug/L Schnitzer - Riverside WR384 3 1 67 1.07 1.4 0 1.8 ug/L Schnitzer International SlipWR123 4 0 100 0.25 0.16 0.062 0.64 ug/L Sulzer Pump WR4 3 0 100 0.087 0.087 0.087 0.087 ug/L

Page 7of11Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Substitution of ND at 0b

High Molecular Weight PAH Open Space (Forest Park)OF22C 2 2 0 0 0 0 0 ug/L Residential OF49 3 0 100 0.075 0.071 0.055 0.100 ug/L Major Transportation H30 3 0 100 0.47 0.32 0.20 0.88 ug/L SJB 4 0 100 3.4 2.3 0.85 8.1 ug/L Open Space/Heavy Ind. OF18 4 0 100 0.79 0.50 0.075 2.1 ug/L OF19 3 0 100 0.81 0.83 0.65 0.95 ug/L Light Industrial OFM1 3 0 100 1.1 1.2 0.89 1.2 ug/L OFM2 4 0 100 0.38 0.31 0.21 0.68 ug/L Heavy Industrial OF16 3 0 100 0.58 0.69 0.28 0.78 ug/L OF22 4 0 100 0.96 0.88 0.48 1.6 ug/L OF22B 3 0 100 0.90 0.64 0.57 1.5 ug/L WR218 2 0 100 0.37 0.37 0.35 0.38 ug/L WR67 4 0 100 0.53 0.52 0.24 0.86 ug/L Arkema WR96 4 0 100 0.044 0.042 0.038 0.054 ug/L Chevron - TransportationWR14 3 0 100 4.7 4.7 1.2 8.1 ug/L GASCO WR107 4 0 100 4.9 4.1 1.8 9.7 ug/L Gunderson WR142 2 0 100 0.34 0.34 0.17 0.51 ug/L WR145 1 0 100 0.70 0.70 0.70 0.70 ug/L WR147 3 0 100 0.28 0.36 0.13 0.36 ug/L OSM WR22 4 0 100 0.55 0.54 0.29 0.83 ug/L Portland Shipyard WR161 5 0 100 0.47 0.53 0.076 0.90 ug/L Schnitzer - Riverside WR384 3 0 100 13.5 11.0 0.35 29.0 ug/L Schnitzer International SlipWR123 4 0 100 0.84 0.79 0.37 1.4 ug/L Sulzer Pump WR4 3 0 100 0.16 0.12 0.056 0.31 ug/L Total PAHs Open Space (Forest Park)OF22C 2 2 0 0 0 0 0 ug/L Residential OF49 3 0 100 0.089 0.092 0.074 0.100 ug/L Major Transportation H30 3 0 100 0.56 0.39 0.28 1.00 ug/L SJB 4 0 100 4.8 2.9 1.2 12.0 ug/L Open Space/Heavy Ind. OF18 4 0 100 0.96 0.58 0.083 2.6 ug/L OF19 3 0 100 0.94 0.98 0.75 1.1 ug/L Light Industrial OFM1 3 0 100 1.4 1.5 1.10 1.6 ug/L OFM2 4 0 100 0.46 0.39 0.26 0.80 ug/L Heavy Industrial OF16 3 0 100 0.90 0.98 0.71 1.00 ug/L OF22 4 0 100 1.8 1.04 0.52 4.5 ug/L OF22B 3 0 100 2.7 2.1 1.2 4.9 ug/L WR218 2 0 100 0.48 0.48 0.44 0.52 ug/L WR67 4 0 100 0.63 0.60 0.31 1.00 ug/L Arkema WR96 4 0 100 0.056 0.053 0.048 0.072 ug/L Chevron - TransportationWR14 3 0 100 5.1 5.1 1.4 8.8 ug/L GASCO WR107 4 0 100 5.8 4.5 2.0 12.0 ug/L Gunderson WR142 2 0 100 0.43 0.43 0.17 0.69 ug/L WR145 1 0 100 0.90 0.90 0.90 0.90 ug/L WR147 3 0 100 0.45 0.56 0.22 0.58 ug/L OSM WR22 4 0 100 0.84 0.72 0.42 1.5 ug/L Portland Shipyard WR161 5 0 100 0.64 0.71 0.12 1.1 ug/L Schnitzer - Riverside WR384 3 0 100 14.1 12.0 0.35 30.0 ug/L Schnitzer International SlipWR123 4 0 100 1.1 1.1 0.44 1.7 ug/L Sulzer Pump WR4 3 0 100 0.25 0.21 0.14 0.40 ug/L

Page 8of11Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Substitution of ND at 0b

Arsenic Open Space (Forest Park)OF22C 2 0 100 0.20 0.20 0.20 0.20 ug/L Residential OF49 3 0 100 0.34 0.29 0.26 0.47 ug/L Major Transportation H30 3 0 100 0.50 0.49 0.49 0.53 ug/L SJB 4 0 100 0.88 0.86 0.82 0.98 ug/L Open Space/Heavy Ind. OF18 4 0 100 1.7 1.7 1.4 1.8 ug/L OF19 4 0 100 1.5 1.6 0.77 2.2 ug/L Light Industrial OFM1 4 0 100 0.93 0.94 0.72 1.1 ug/L OFM2 4 0 100 1.6 1.5 0.99 2.3 ug/L Heavy Industrial OF16 5 0 100 0.63 0.71 0.34 0.79 ug/L OF22 3 0 100 3.3 3.6 2.4 4.0 ug/L OF22B 2 0 100 4.9 4.9 4.0 5.8 ug/L WR218 2 0 100 1.1 1.1 0.94 1.3 ug/L WR67 5 0 100 0.31 0.23 0.13 0.59 ug/L Arkema WR96 4 0 100 17.9 17.5 16.9 19.8 ug/L Chevron - TransportationWR14 5 0 100 0.51 0.54 0.27 0.71 ug/L GASCO WR107 4 0 100 0.76 0.72 0.27 1.3 ug/L Gunderson WR142 1 0 100 0.87 0.87 0.87 0.87 ug/L WR145 1 1 0 0 0 0 0 ug/L WR147 5 0 100 0.68 0.63 0.38 1.07 ug/L OSM WR22 4 0 100 6.6 6.9 4.2 8.4 ug/L Portland Shipyard WR161 4 0 100 1.5 1.5 1.10 1.8 ug/L Schnitzer - Riverside WR384 4 0 100 2.0 1.9 1.5 2.9 ug/L Schnitzer International SlipWR123 4 0 100 8.2 8.0 2.7 14.3 ug/L Sulzer Pump WR4 4 0 100 0.29 0.27 0.21 0.42 ug/L Lead Open Space (Forest Park)OF22C 2 0 100 0.42 0.42 0.40 0.44 ug/L Residential OF49 3 0 100 2.8 2.8 1.4 4.3 ug/L Major Transportation H30 3 0 100 8.6 7.1 5.4 13.2 ug/L SJB 4 0 100 39.6 30.0 23.2 75.2 ug/L Open Space/Heavy Ind. OF18 4 0 100 44.5 39.3 23.2 76.3 ug/L OF19 4 0 100 21.8 17.9 10.4 41.0 ug/L Light Industrial OFM1 4 0 100 8.8 4.8 4.2 21.4 ug/L OFM2 4 0 100 4.7 3.8 2.9 8.4 ug/L Heavy Industrial OF16 5 0 100 30.4 22.4 13.4 55.4 ug/L OF22 3 0 100 16.4 14.7 9.7 24.7 ug/L OF22B 2 0 100 148 148 101 195 ug/L WR218 2 0 100 12.6 12.6 5.7 19.5 ug/L WR67 5 0 100 3.4 1.7 0.62 9.3 ug/L Arkema WR96 4 0 100 12.7 13.5 8.5 15.3 ug/L Chevron - TransportationWR14 5 0 100 7.0 6.7 2.6 11.4 ug/L GASCO WR107 4 0 100 4.9 4.5 2.8 7.8 ug/L Gunderson WR142 1 0 100 1.2 1.2 1.2 1.2 ug/L WR145 1 0 100 7.0 7.0 7.0 7.0 ug/L WR147 5 0 100 63.3 34.8 14.6 143 ug/L OSM WR22 4 0 100 48.3 49.0 39.1 56.1 ug/L Portland Shipyard WR161 4 0 100 27.8 14.8 11.4 70.0 ug/L Schnitzer - Riverside WR384 4 0 100 377 433 6.2 635 ug/L Schnitzer International SlipWR123 4 0 100 41.7 38.6 17.7 71.8 ug/L Sulzer Pump WR4 4 0 100 6.3 5.1 1.9 13.0 ug/L

Page 9of11Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Substitution of ND at 0b

Mercury Open Space (Forest Park)OF22C 2 2 0 0 0 0 0 ug/L Residential OF49 3 3 0 0 0 0 0 ug/L Major Transportation H30 3 2 33 0.010 0 0 0.030 ug/L SJB 4 3 25 0.015 0 0 0.060 ug/L Open Space/Heavy Ind. OF18 4 1 75 0.025 0.030 0 0.040 ug/L OF19 4 4 0 0 0 0 0 ug/L Light Industrial OFM1 4 4 0 0 0 0 0 ug/L OFM2 4 4 0 0 0 0 0 ug/L Heavy Industrial OF16 5 3 40 0.016 0 0 0.040 ug/L OF22 3 2 33 0.013 0 0 0.040 ug/L OF22B 2 0 100 0.55 0.55 0.21 0.89 ug/L WR218 2 2 0 0 0 0 0 ug/L WR67 5 5 0 0 0 0 0 ug/L Arkema WR96 4 1 75 0.20 0.22 0 0.36 ug/L Chevron - TransportationWR14 5 5 0 0 0 0 0 ug/L GASCO WR107 4 4 0 0 0 0 0 ug/L Gunderson WR142 1 1 0 0 0 0 0 ug/L WR145 1 1 0 0 0 0 0 ug/L WR147 5 4 20 0.014 0 0 0.070 ug/L OSM WR22 4 1 75 0.063 0.075 0 0.100 ug/L Portland Shipyard WR161 4 3 25 0.0075 0 0 0.030 ug/L Schnitzer - Riverside WR384 4 0 100 0.87 0.81 0.080 1.8 ug/L Schnitzer International SlipWR123 4 3 25 0.020 0 0 0.080 ug/L Sulzer Pump WR4 4 4 0 0 0 0 0 ug/L 2,4-D Open Space (Forest Park)OF22C 2 2 0 0 0 0 0 ug/L Residential OF49 2 0 100 1.2 1.2 0.34 2.0 ug/L Major Transportation H30 2 1 50 0.11 0.11 0 0.22 ug/L SJB 4 3 25 0.28 0 0 1.1 ug/L Open Space/Heavy Ind. OF18 4 2 50 0.041 0.034 0 0.097 ug/L OF19 4 1 75 0.072 0.069 0 0.15 ug/L Light Industrial OFM1 3 1 67 0.100 0.11 0 0.19 ug/L OFM2 3 0 100 0.46 0.19 0.083 1.1 ug/L Heavy Industrial OF16 3 0 100 0.33 0.28 0.058 0.64 ug/L OF22 3 2 33 0.31 0 0 0.94 ug/L OF22B 3 0 100 1.9 0.78 0.76 4.1 ug/L WR218 1 0 100 16.0 16.0 16.0 16.0 ug/L WR67 2 2 0 0 0 0 0 ug/L Arkema WR96 2 2 0 0 0 0 0 ug/L Chevron - TransportationWR14 3 3 0 0 0 0 0 ug/L GASCO WR107 4 4 0 0 0 0 0 ug/L Gunderson WR142 2 2 0 0 0 0 0 ug/L WR147 2 2 0 0 0 0 0 ug/L OSM WR22 4 4 0 0 0 0 0 ug/L Portland Shipyard WR161 5 5 0 0 0 0 0 ug/L Schnitzer - Riverside WR384 3 0 100 1.01 1.2 0.64 1.2 ug/L Schnitzer International SlipWR123 4 1 75 0.16 0.18 0 0.30 ug/L Sulzer Pump WR4 3 1 67 0.070 0.100 0 0.11 ug/L Total Phthalates Open Space (Forest Park)OF22C 2 1 50 0.12 0.12 0 0.23 ug/L Residential OF49 2 0 100 2.0 2.0 1.3 2.7 ug/L Major Transportation SJB 4 0 100 13.8 15.5 3.2 21.0 ug/L Open Space/Heavy Ind. OF18 4 0 100 6.3 6.4 2.3 10.0 ug/L Light Industrial OFM2 4 0 100 3.1 2.5 1.9 5.5 ug/L Arkema WR96 4 1 75 0.28 0.27 0 0.59 ug/L Gunderson WR142 2 0 100 0.66 0.66 0.48 0.84 ug/L WR147 3 0 100 3.2 2.3 2.1 5.1 ug/L OSM WR22 4 0 100 1.2 1.1 0.072 2.4 ug/L Portland Shipyard WR161 5 0 100 2.5 1.3 0.34 7.4 ug/L Schnitzer International SlipWR123 3 1 67 2.4 2.4 0 4.8 ug/L

**NOTE:** For the calculation of summed Totals, individual component ND are set to 0.

aWhen summed Total is ND (all component concentrations are ND), the value is substituted with 1⁄2 the DL.

bWhen summed Total is ND (all component concentrations are ND) the value is substituted with 0.

Page 10of11Table: Summary Stats by Individual Stormwater Outfall

Non-detect Treatment Analyte Land Use Group Outfall IDNumber of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximumunits

Page 11of11

### Table: Summary Stats by Land Use Group

Non-detect Treatment Analyte Land Use Group Number of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximum units

Substitution of ND at 1/2 DLa



### Total PCBs Open Space (Forest Park) 2 1 50 53.5 53.5 26.2 80.8pg/L Residential 2 0 100 1180 1180 1140 1220pg/L Major Transportation 5 0 100 72500 66000 8500 185000pg/L Open Space/Heavy Ind. 7 0 100 117000 67700 11100 503000pg/L Light Industrial 7 0 100 9450 9040 1700 19100pg/L Heavy Industrial 16 0 100 64100 30400 344 244000pg/L Arkema 3 0 100 12300 8340 8210 20200pg/L Chevron - Transportation 3 0 100 5700 5520 971 10600pg/L GASCO 4 0 100 2500 2530 510 4420pg/L Gunderson 5 0 100 395000237000 852 1310000pg/L OSM 4 0 100 278000271500243000325000pg/L Portland Shipyard 5 0 100 125000119000 1400 302000pg/L Schnitzer - Riverside 4 0 100 5130000440000010000011600000pg/L Schnitzer International Slip 4 0 100 277000255500 56700 539000pg/L Sulzer Pump 3 0 100 8590 4860 4820 16100pg/L Total suspended solids Open Space (Forest Park) 2 0 100 10.0 10.0 10.0 10.0mg/L Residential 3 0 100 20.7 16.0 8.0 38.0mg/L Major Transportation 10 0 100 92.2 71.0 13.0 248mg/L Open Space/Heavy Ind. 10 0 100 109 104 17.0 212mg/L Light Industrial 8 0 100 59.1 53.0 31.0 97.0mg/L Heavy Industrial 20 0 100 104 73.0 6.0 351 mg/L Arkema 5 0 100 12.0 11.0 5.0 20.0mg/L Chevron - Transportation 5 0 100 38.4 42.0 12.0 51.0mg/L GASCO 5 0 100 24.0 26.0 10.0 36.0mg/L Gunderson 8 0 100 34.1 17.0 8.0 119mg/L OSM 5 0 100 208 146 128 401 mg/L Portland Shipyard 6 0 100 80.3 39.5 8.0 256mg/L Schnitzer - Riverside 5 0 100 264 167 6.0 780mg/L Schnitzer International Slip 6 0 100 231 230 58.0 414mg/L Sulzer Pump 4 0 100 14.0 13.5 5.0 24.0mg/L Total organic carbon Open Space (Forest Park) 2 0 100 3.1 3.1 2.8 3.3 mg/L Residential 3 0 100 9.4 6.8 5.7 15.6mg/L Major Transportation 10 0 100 21.3 19.8 3.9 39.5mg/L Open Space/Heavy Ind. 10 0 100 8.3 7.0 4.1 19.0mg/L Light Industrial 8 0 100 8.9 9.0 3.2 14.1mg/L Heavy Industrial 19 0 100 15.5 10.6 4.3 60.0mg/L Arkema 5 0 100 11.4 7.5 4.5 30.8mg/L Chevron - Transportation 5 0 100 10.3 6.4 4.1 23.6mg/L GASCO 5 0 100 4.2 4.2 2.9 5.6 mg/L Gunderson 8 0 100 14.9 11.9 5.5 38.6mg/L OSM 5 0 100 5.8 6.0 3.2 8.2 mg/L Portland Shipyard 6 0 100 50.1 13.8 4.1 144mg/L Schnitzer - Riverside 5 0 100 27.2 23.7 21.7 42.3mg/L Schnitzer International Slip 6 0 100 14.6 13.1 8.8 27.5mg/L Sulzer Pump 4 0 100 6.2 5.2 2.9 11.4mg/L

Page 1of 8

### Table: Summary Stats by Land Use Group

Non-detect Treatment Analyte Land Use Group Number of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximum units

Substitution of ND at 1/2 DLa



### Total of 2,4' and 4,4'-DDD, -DDE, -DDTHeavy Industrial 3 0 100 97.7 71.0 12.0 210ng/L Arkema 4 0 100 4300 2650 900 11000ng/L Low Molecular Weight PAH Open Space (Forest Park) 2 2 0 0.0080 0.0080 0.0075 0.0085ug/L Residential 3 1 67 0.017 0.019 0.0095 0.021ug/L Major Transportation 7 0 100 0.86 0.31 0.071 4.1 ug/L Open Space/Heavy Ind. 7 0 100 0.15 0.100 0.0084 0.47ug/L Light Industrial 7 0 100 0.19 0.12 0.053 0.46ug/L Heavy Industrial 16 0 100 0.64 0.18 0.040 4.3 ug/L Arkema 4 0 100 0.013 0.013 0.0067 0.018ug/L Chevron - Transportation 3 0 100 0.44 0.45 0.19 0.69ug/L GASCO 4 0 100 0.85 0.46 0.20 2.3 ug/L Gunderson 6 1 83 0.15 0.19 0.0025 0.22ug/L OSM 4 0 100 0.30 0.19 0.13 0.68ug/L Portland Shipyard 5 0 100 0.17 0.21 0.042 0.22ug/L Schnitzer - Riverside 3 1 67 1.08 1.4 0.046 1.8 ug/L Schnitzer International Slip 4 0 100 0.25 0.16 0.062 0.64ug/L Sulzer Pump 3 0 100 0.087 0.087 0.087 0.087ug/L High Molecular Weight PAH Open Space (Forest Park) 2 2 0 0.0028 0.0028 0.0027 0.0028ug/L Residential 3 0 100 0.075 0.071 0.055 0.100ug/L Major Transportation 7 0 100 2.1 0.88 0.20 8.1 ug/L Open Space/Heavy Ind. 7 0 100 0.80 0.65 0.075 2.1 ug/L Light Industrial 7 0 100 0.69 0.68 0.21 1.2 ug/L Heavy Industrial 16 0 100 0.70 0.62 0.24 1.6 ug/L Arkema 4 0 100 0.044 0.042 0.038 0.054ug/L Chevron - Transportation 3 0 100 4.7 4.7 1.2 8.1 ug/L GASCO 4 0 100 4.9 4.1 1.8 9.7 ug/L Gunderson 6 0 100 0.37 0.36 0.13 0.70ug/L OSM 4 0 100 0.55 0.54 0.29 0.83ug/L Portland Shipyard 5 0 100 0.47 0.53 0.076 0.90ug/L Schnitzer - Riverside 3 0 100 13.5 11.0 0.35 29.0ug/L Schnitzer International Slip 4 0 100 0.84 0.79 0.37 1.4 ug/L Sulzer Pump 3 0 100 0.16 0.12 0.056 0.31ug/L Total PAHs Open Space (Forest Park) 2 2 0 0.0080 0.0080 0.0075 0.0085ug/L Residential 3 0 100 0.089 0.092 0.074 0.100ug/L Major Transportation 7 0 100 3.0 1.2 0.28 12.0ug/L Open Space/Heavy Ind. 7 0 100 0.95 0.75 0.083 2.6 ug/L Light Industrial 7 0 100 0.86 0.80 0.26 1.6 ug/L Heavy Industrial 16 0 100 1.3 0.88 0.31 4.9 ug/L Arkema 4 0 100 0.056 0.053 0.048 0.072ug/L Chevron - Transportation 3 0 100 5.1 5.1 1.4 8.8 ug/L GASCO 4 0 100 5.8 4.5 2.0 12.0ug/L Gunderson 6 0 100 0.52 0.57 0.17 0.90ug/L OSM 4 0 100 0.84 0.72 0.42 1.5 ug/L Portland Shipyard 5 0 100 0.64 0.71 0.12 1.1 ug/L Schnitzer - Riverside 3 0 100 14.1 12.0 0.35 30.0ug/L Schnitzer International Slip 4 0 100 1.10 1.1 0.44 1.7 ug/L Sulzer Pump 3 0 100 0.25 0.21 0.14 0.40ug/L

Page 2of 8

### Table: Summary Stats by Land Use Group

Non-detect Treatment Analyte Land Use Group Number of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximum units

Substitution of ND at 1/2 DLa



### Arsenic Open Space (Forest Park) 2 0 100 0.20 0.20 0.20 0.20ug/L Residential 3 0 100 0.34 0.29 0.26 0.47ug/L Major Transportation 7 0 100 0.72 0.82 0.49 0.98ug/L Open Space/Heavy Ind. 8 0 100 1.6 1.7 0.77 2.2 ug/L Light Industrial 8 0 100 1.3 1.06 0.72 2.3 ug/L Heavy Industrial 17 0 100 1.6 0.78 0.13 5.8 ug/L Arkema 4 0 100 17.9 17.5 16.9 19.8ug/L Chevron - Transportation 5 0 100 0.51 0.54 0.27 0.71ug/L GASCO 4 0 100 0.76 0.72 0.27 1.3 ug/L Gunderson 7 1 86 0.61 0.63 0.0035 1.07ug/L OSM 4 0 100 6.6 6.9 4.2 8.4 ug/L Portland Shipyard 4 0 100 1.5 1.5 1.10 1.8 ug/L Schnitzer - Riverside 4 0 100 2.0 1.9 1.5 2.9 ug/L Schnitzer International Slip 4 0 100 8.2 8.0 2.7 14.3ug/L Sulzer Pump 4 0 100 0.29 0.27 0.21 0.42ug/L Lead Open Space (Forest Park) 2 0 100 0.42 0.42 0.40 0.44ug/L Residential 3 0 100 2.8 2.8 1.4 4.3 ug/L Major Transportation 7 0 100 26.3 23.2 5.4 75.2ug/L Open Space/Heavy Ind. 8 0 100 33.2 24.2 10.4 76.3ug/L Light Industrial 8 0 100 6.7 4.2 2.9 21.4ug/L Heavy Industrial 17 0 100 31.7 14.7 0.62 195ug/L Arkema 4 0 100 12.7 13.5 8.5 15.3ug/L Chevron - Transportation 5 0 100 7.0 6.7 2.6 11.4ug/L GASCO 4 0 100 4.9 4.5 2.8 7.8 ug/L Gunderson 7 0 100 46.4 25.5 1.2 143ug/L OSM 4 0 100 48.3 49.0 39.1 56.1ug/L Portland Shipyard 4 0 100 27.8 14.8 11.4 70.0ug/L Schnitzer - Riverside 4 0 100 377 433 6.2 635ug/L Schnitzer International Slip 4 0 100 41.7 38.6 17.7 71.8ug/L Sulzer Pump 4 0 100 6.3 5.1 1.9 13.0ug/L Mercury Open Space (Forest Park) 2 2 0 0.015 0.015 0.015 0.015ug/L Residential 3 3 0 0.015 0.015 0.015 0.015ug/L Major Transportation 7 5 29 0.028 0.030 0.010 0.060ug/L Open Space/Heavy Ind. 8 5 38 0.028 0.030 0.010 0.045ug/L Light Industrial 8 8 0 0.016 0.015 0.010 0.030ug/L Heavy Industrial 17 12 29 0.088 0.025 0.015 0.89ug/L Arkema 4 1 75 0.25 0.23 0.19 0.36ug/L Chevron - Transportation 5 5 0 0.017 0.015 0.010 0.030ug/L GASCO 4 4 0 0.015 0.015 0.010 0.020ug/L Gunderson 7 6 14 0.033 0.015 0.015 0.085ug/L OSM 4 1 75 0.084 0.093 0.050 0.100ug/L Portland Shipyard 4 3 25 0.024 0.023 0.010 0.040ug/L Schnitzer - Riverside 4 0 100 0.87 0.81 0.080 1.8 ug/L Schnitzer International Slip 4 3 25 0.041 0.035 0.015 0.080ug/L Sulzer Pump 4 4 0 0.016 0.015 0.010 0.025ug/L

Page 3of 8

### Table: Summary Stats by Land Use Group

Non-detect Treatment Analyte Land Use Group Number of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximum units

Substitution of ND at 1/2 DLa



### 2,4-D Open Space (Forest Park) 2 2 0 0.018 0.018 0.017 0.018ug/L Residential 2 0 100 1.2 1.2 0.34 2.0 ug/L Major Transportation 6 4 33 0.33 0.20 0.085 1.1 ug/L Open Space/Heavy Ind. 8 3 63 0.078 0.076 0.017 0.15ug/L Light Industrial 6 1 83 0.28 0.15 0.017 1.1 ug/L Heavy Industrial 12 4 67 2.0 0.46 0.018 16.0ug/L Arkema 2 2 0 0.19 0.19 0.19 0.19ug/L Chevron - Transportation 3 3 0 0.13 0.19 0.018 0.19ug/L GASCO 4 4 0 0.32 0.059 0.018 1.2 ug/L Gunderson 4 4 0 0.15 0.18 0.085 0.18ug/L OSM 4 4 0 0.036 0.018 0.017 0.090ug/L Portland Shipyard 5 5 0 0.48 0.19 0.018 1.8 ug/L Schnitzer - Riverside 3 0 100 1.01 1.2 0.64 1.2 ug/L Schnitzer International Slip 4 1 75 0.21 0.20 0.13 0.30ug/L Sulzer Pump 3 1 67 0.076 0.100 0.017 0.11ug/L Total Phthalates Open Space (Forest Park) 2 1 50 0.14 0.14 0.044 0.23ug/L Residential 2 0 100 2.0 2.0 1.3 2.7 ug/L Major Transportation 4 0 100 13.8 15.5 3.2 21.0ug/L Open Space/Heavy Ind. 4 0 100 6.3 6.4 2.3 10.0ug/L Light Industrial 4 0 100 3.1 2.5 1.9 5.5 ug/L Arkema 4 1 75 0.31 0.30 0.035 0.59ug/L Gunderson 5 0 100 2.2 2.1 0.48 5.1 ug/L OSM 4 0 100 1.2 1.1 0.072 2.4 ug/L Portland Shipyard 5 0 100 2.5 1.3 0.34 7.4 ug/L Schnitzer International Slip 3 1 67 2.5 2.4 0.17 4.8 ug/L

Page 4of 8

### Table: Summary Stats by Land Use Group

Non-detect Treatment Analyte Land Use Group Number of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximum units

Substitution of ND at 0b



### Total PCBs Open Space (Forest Park) 2 1 50 40.4 40.4 0 80.8pg/L Residential 2 0 100 1180 1180 1140 1220pg/L Major Transportation 5 0 100 72500 66000 8500 185000pg/L Open Space/Heavy Ind. 7 0 100 117000 67700 11100 503000pg/L Light Industrial 7 0 100 9450 9040 1700 19100pg/L Heavy Industrial 16 0 100 64100 30400 344 244000pg/L Arkema 3 0 100 12300 8340 8210 20200pg/L Chevron - Transportation 3 0 100 5700 5520 971 10600pg/L GASCO 4 0 100 2500 2530 510 4420pg/L Gunderson 5 0 100 395000237000 852 1310000pg/L OSM 4 0 100 278000271500243000325000pg/L Portland Shipyard 5 0 100 125000119000 1400 302000pg/L Schnitzer - Riverside 4 0 100 5130000440000010000011600000pg/L Schnitzer International Slip 4 0 100 277000255500 56700 539000pg/L Sulzer Pump 3 0 100 8590 4860 4820 16100pg/L Total suspended solids Open Space (Forest Park) 2 0 100 10.0 10.0 10.0 10.0mg/L Residential 3 0 100 20.7 16.0 8.0 38.0mg/L Major Transportation 10 0 100 92.2 71.0 13.0 248mg/L Open Space/Heavy Ind. 10 0 100 109 104 17.0 212mg/L Light Industrial 8 0 100 59.1 53.0 31.0 97.0mg/L Heavy Industrial 20 0 100 104 73.0 6.0 351 mg/L Arkema 5 0 100 12.0 11.0 5.0 20.0mg/L Chevron - Transportation 5 0 100 38.4 42.0 12.0 51.0mg/L GASCO 5 0 100 24.0 26.0 10.0 36.0mg/L Gunderson 8 0 100 34.1 17.0 8.0 119mg/L OSM 5 0 100 208 146 128 401 mg/L Portland Shipyard 6 0 100 80.3 39.5 8.0 256mg/L Schnitzer - Riverside 5 0 100 264 167 6.0 780mg/L Schnitzer International Slip 6 0 100 231 230 58.0 414mg/L Sulzer Pump 4 0 100 14.0 13.5 5.0 24.0mg/L Total organic carbon Open Space (Forest Park) 2 0 100 3.1 3.1 2.8 3.3 mg/L Residential 3 0 100 9.4 6.8 5.7 15.6mg/L Major Transportation 10 0 100 21.3 19.8 3.9 39.5mg/L Open Space/Heavy Ind. 10 0 100 8.3 7.0 4.1 19.0mg/L Light Industrial 8 0 100 8.9 9.0 3.2 14.1mg/L Heavy Industrial 19 0 100 15.5 10.6 4.3 60.0mg/L Arkema 5 0 100 11.4 7.5 4.5 30.8mg/L Chevron - Transportation 5 0 100 10.3 6.4 4.1 23.6mg/L GASCO 5 0 100 4.2 4.2 2.9 5.6 mg/L Gunderson 8 0 100 14.9 11.9 5.5 38.6mg/L OSM 5 0 100 5.8 6.0 3.2 8.2 mg/L Portland Shipyard 6 0 100 50.1 13.8 4.1 144mg/L Schnitzer - Riverside 5 0 100 27.2 23.7 21.7 42.3mg/L Schnitzer International Slip 6 0 100 14.6 13.1 8.8 27.5mg/L Sulzer Pump 4 0 100 6.2 5.2 2.9 11.4mg/L

Page 5of 8

### Table: Summary Stats by Land Use Group

Non-detect Treatment Analyte Land Use Group Number of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximum units

Substitution of ND at 0b



### Total of 2,4' and 4,4'-DDD, -DDE, -DDTHeavy Industrial 3 0 100 97.7 71.0 12.0 210ng/L Arkema 4 0 100 4300 2650 900 11000ng/L Low Molecular Weight PAH Open Space (Forest Park) 2 2 0 0 0 0 0 ug/L Residential 3 1 67 0.013 0.019 0 0.021ug/L Major Transportation 7 0 100 0.86 0.31 0.071 4.1 ug/L Open Space/Heavy Ind. 7 0 100 0.15 0.100 0.0084 0.47ug/L Light Industrial 7 0 100 0.19 0.12 0.053 0.46ug/L Heavy Industrial 16 0 100 0.64 0.18 0.040 4.3 ug/L Arkema 4 0 100 0.013 0.013 0.0067 0.018ug/L Chevron - Transportation 3 0 100 0.44 0.45 0.19 0.69ug/L GASCO 4 0 100 0.85 0.46 0.20 2.3 ug/L Gunderson 6 1 83 0.15 0.19 0 0.22ug/L OSM 4 0 100 0.30 0.19 0.13 0.68ug/L Portland Shipyard 5 0 100 0.17 0.21 0.042 0.22ug/L Schnitzer - Riverside 3 1 67 1.07 1.4 0 1.8 ug/L Schnitzer International Slip 4 0 100 0.25 0.16 0.062 0.64ug/L Sulzer Pump 3 0 100 0.087 0.087 0.087 0.087ug/L High Molecular Weight PAH Open Space (Forest Park) 2 2 0 0 0 0 0 ug/L Residential 3 0 100 0.075 0.071 0.055 0.100ug/L Major Transportation 7 0 100 2.1 0.88 0.20 8.1 ug/L Open Space/Heavy Ind. 7 0 100 0.80 0.65 0.075 2.1 ug/L Light Industrial 7 0 100 0.69 0.68 0.21 1.2 ug/L Heavy Industrial 16 0 100 0.70 0.62 0.24 1.6 ug/L Arkema 4 0 100 0.044 0.042 0.038 0.054ug/L Chevron - Transportation 3 0 100 4.7 4.7 1.2 8.1 ug/L GASCO 4 0 100 4.9 4.1 1.8 9.7 ug/L Gunderson 6 0 100 0.37 0.36 0.13 0.70ug/L OSM 4 0 100 0.55 0.54 0.29 0.83ug/L Portland Shipyard 5 0 100 0.47 0.53 0.076 0.90ug/L Schnitzer - Riverside 3 0 100 13.5 11.0 0.35 29.0ug/L Schnitzer International Slip 4 0 100 0.84 0.79 0.37 1.4 ug/L Sulzer Pump 3 0 100 0.16 0.12 0.056 0.31ug/L Total PAHs Open Space (Forest Park) 2 2 0 0 0 0 0 ug/L Residential 3 0 100 0.089 0.092 0.074 0.100ug/L Major Transportation 7 0 100 3.0 1.2 0.28 12.0ug/L Open Space/Heavy Ind. 7 0 100 0.95 0.75 0.083 2.6 ug/L Light Industrial 7 0 100 0.86 0.80 0.26 1.6 ug/L Heavy Industrial 16 0 100 1.3 0.88 0.31 4.9 ug/L Arkema 4 0 100 0.056 0.053 0.048 0.072ug/L Chevron - Transportation 3 0 100 5.1 5.1 1.4 8.8 ug/L GASCO 4 0 100 5.8 4.5 2.0 12.0ug/L Gunderson 6 0 100 0.52 0.57 0.17 0.90ug/L OSM 4 0 100 0.84 0.72 0.42 1.5 ug/L Portland Shipyard 5 0 100 0.64 0.71 0.12 1.1 ug/L Schnitzer - Riverside 3 0 100 14.1 12.0 0.35 30.0ug/L Schnitzer International Slip 4 0 100 1.10 1.1 0.44 1.7 ug/L Sulzer Pump 3 0 100 0.25 0.21 0.14 0.40ug/L

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### Table: Summary Stats by Land Use Group

Non-detect Treatment Analyte Land Use Group Number of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximum units

Substitution of ND at 0b



### Arsenic Open Space (Forest Park) 2 0 100 0.20 0.20 0.20 0.20ug/L Residential 3 0 100 0.34 0.29 0.26 0.47ug/L Major Transportation 7 0 100 0.72 0.82 0.49 0.98ug/L Open Space/Heavy Ind. 8 0 100 1.6 1.7 0.77 2.2 ug/L Light Industrial 8 0 100 1.3 1.06 0.72 2.3 ug/L Heavy Industrial 17 0 100 1.6 0.78 0.13 5.8 ug/L Arkema 4 0 100 17.9 17.5 16.9 19.8ug/L Chevron - Transportation 5 0 100 0.51 0.54 0.27 0.71ug/L GASCO 4 0 100 0.76 0.72 0.27 1.3 ug/L Gunderson 7 1 86 0.61 0.63 0 1.07ug/L OSM 4 0 100 6.6 6.9 4.2 8.4 ug/L Portland Shipyard 4 0 100 1.5 1.5 1.10 1.8 ug/L Schnitzer - Riverside 4 0 100 2.0 1.9 1.5 2.9 ug/L Schnitzer International Slip 4 0 100 8.2 8.0 2.7 14.3ug/L Sulzer Pump 4 0 100 0.29 0.27 0.21 0.42ug/L Lead Open Space (Forest Park) 2 0 100 0.42 0.42 0.40 0.44ug/L Residential 3 0 100 2.8 2.8 1.4 4.3 ug/L Major Transportation 7 0 100 26.3 23.2 5.4 75.2ug/L Open Space/Heavy Ind. 8 0 100 33.2 24.2 10.4 76.3ug/L Light Industrial 8 0 100 6.7 4.2 2.9 21.4ug/L Heavy Industrial 17 0 100 31.7 14.7 0.62 195ug/L Arkema 4 0 100 12.7 13.5 8.5 15.3ug/L Chevron - Transportation 5 0 100 7.0 6.7 2.6 11.4ug/L GASCO 4 0 100 4.9 4.5 2.8 7.8 ug/L Gunderson 7 0 100 46.4 25.5 1.2 143ug/L OSM 4 0 100 48.3 49.0 39.1 56.1ug/L Portland Shipyard 4 0 100 27.8 14.8 11.4 70.0ug/L Schnitzer - Riverside 4 0 100 377 433 6.2 635ug/L Schnitzer International Slip 4 0 100 41.7 38.6 17.7 71.8ug/L Sulzer Pump 4 0 100 6.3 5.1 1.9 13.0ug/L Mercury Open Space (Forest Park) 2 2 0 0 0 0 0 ug/L Residential 3 3 0 0 0 0 0 ug/L Major Transportation 7 5 29 0.013 0 0 0.060ug/L Open Space/Heavy Ind. 8 5 38 0.013 0 0 0.040ug/L Light Industrial 8 8 0 0 0 0 0 ug/L Heavy Industrial 17 12 29 0.072 0 0 0.89ug/L Arkema 4 1 75 0.20 0.22 0 0.36ug/L Chevron - Transportation 5 5 0 0 0 0 0 ug/L GASCO 4 4 0 0 0 0 0 ug/L Gunderson 7 6 14 0.0100 0 0 0.070ug/L OSM 4 1 75 0.063 0.075 0 0.100ug/L Portland Shipyard 4 3 25 0.0075 0 0 0.030ug/L Schnitzer - Riverside 4 0 100 0.87 0.81 0.080 1.8 ug/L Schnitzer International Slip 4 3 25 0.020 0 0 0.080ug/L Sulzer Pump 4 4 0 0 0 0 0 ug/L

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### Table: Summary Stats by Land Use Group

Non-detect Treatment Analyte Land Use Group Number of SamplesNumber of

Non-DetectsDetection

Frequency (%) Mean MedianMinimumMaximum units

Substitution of ND at 0b



### 2,4-D Open Space (Forest Park) 2 2 0 0 0 0 0 ug/L Residential 2 0 100 1.2 1.2 0.34 2.0 ug/L Major Transportation 6 4 33 0.22 0 0 1.1 ug/L Open Space/Heavy Ind. 8 3 63 0.057 0.062 0 0.15ug/L Light Industrial 6 1 83 0.28 0.15 0 1.1 ug/L Heavy Industrial 12 4 67 2.0 0.46 0 16.0ug/L Arkema 2 2 0 0 0 0 0 ug/L Chevron - Transportation 3 3 0 0 0 0 0 ug/L GASCO 4 4 0 0 0 0 0 ug/L Gunderson 4 4 0 0 0 0 0 ug/L OSM 4 4 0 0 0 0 0 ug/L Portland Shipyard 5 5 0 0 0 0 0 ug/L Schnitzer - Riverside 3 0 100 1.01 1.2 0.64 1.2 ug/L Schnitzer International Slip 4 1 75 0.16 0.18 0 0.30ug/L Sulzer Pump 3 1 67 0.070 0.100 0 0.11ug/L Total Phthalates Open Space (Forest Park) 2 1 50 0.12 0.12 0 0.23ug/L Residential 2 0 100 2.0 2.0 1.3 2.7 ug/L Major Transportation 4 0 100 13.8 15.5 3.2 21.0ug/L Open Space/Heavy Ind. 4 0 100 6.3 6.4 2.3 10.0ug/L Light Industrial 4 0 100 3.1 2.5 1.9 5.5 ug/L Arkema 4 1 75 0.28 0.27 0 0.59ug/L Gunderson 5 0 100 2.2 2.1 0.48 5.1 ug/L OSM 4 0 100 1.2 1.1 0.072 2.4 ug/L Portland Shipyard 5 0 100 2.5 1.3 0.34 7.4 ug/L Schnitzer International Slip 3 1 67 2.4 2.4 0 4.8 ug/L

**NOTE:** For the calculation of summed Totals, individual component ND are set to 0.

a

### When summed Total is ND (all component concentrations are ND), the value is substituted with 1⁄2 the DL.

b

### When summed Total is ND (all component concentrations are ND) the value is substituted with 0.

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