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Metal Soil Type Detection Data Mean Std. Max. Background Frequency Distribution Screening Level (mg/kg) Org. Clay 100% Normal 49.7 11.5 64.4 84.1 Iron Sand 100% Normal 17,351 5,780 26,200 34,691 Silt&Mineral Clay 100% Normal 27,866 4,808 37,100 42,290 Org. Clay 100% Normal 30,667 6,151 39,200 49,119 Lead Sand 100% Normal 2.99 1.11 5.2 6.32 Silt& Mineral Clay 100% Normal 6.90 1.72 10.4 12.10 Org. Clay 100% Normal 11.50 2.84 15.0 20.00 Manganese Sand 100% Lognormal 335 215 739 979 Silt&Mineral Clay 100% Lognormal 655 452 6,740 2,011 Org. Clay 100% Lognormal 606 228 1,120 1,289 Mercury All Soil Types 5% --- --- --- 0.26 0.173 Molybdenum All Soil Types 29% --- --- --- 7.10 4.880 Nickel Sand 100% Normal 27.8 19.3 75.2 85.7 Silt&Mineral Clay 100% Lognormal 36.4 12.3 79.7 73.1 Org. Clay 100% Normal 62.0 13.9 83.3 104.0 Selenium All Soil Types 5% --- --- --- 2.5 1.18 Silver All Soil Types 40% --- --- --- 5.3 1.41 Thallium All Soil Types 45% --- --- --- 1.8 1.67 Vanadium Sand 100% Normal 39.9 10.7 55.6 72.0 Silt&Mineral Clay 100% Normal 66.7 11.3 94.4 101.0 Org. Clay 100% Normal 103.0 29.7 148.0 192.0 Zinc Sand 100% Normal 37.4 12.8 58.3 75.8 Silt&Mineral Clay 100% Normal 71.4 11.3 101.0 105.0 Org. Clay 100% Normal 76.8 17.7 105.0 130.0 Std. =Standard Deviation Max. =Maximum CA DI-WET METALS' SCREENING LEVELS Metal Detection Original Data Adjusted Data via Log Max, Background Frequency (SWI) Transformation(µg/1) (fig/I) Level Screening Mean Std Mean Std WWI) Aluminum 100% 1,097 729 1,214 1,291 2,350 5,087 100% 3,317 3,805 3,566 5,645 17,600 20,500 100% 5,940 5,623 6,757 10,415 17,700 38,000 Antimony 20% --- --- --- --- 3 2.56 Arsenic 84% 26.3 31.6 29.3 57.4 163 201.0 Barium 98% 144 237 134 197 1,320 725.0 Beryllium 0% --- --- --- _-- ___ ___ Rough&Ready Island 2 Tetra Tech, Inc. Final Work Plan Addendum December 11, 1998.