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002354 (table 18) were less than the minimum uranium concentration of 3.0 ~g/g reported for the nine initial DOl reconnaissance investigations (table 12). The uranium concentrations also were less than the median uranium concentration of 3.73 ~g/g for the 28 samples from the Grand Valley (table 5). Table 12.--Baseline geochemical data for soils in the Western United States and for bottom-sediment samples collected for nine irrigation- drainage reconnaissance investigations [Soil data for the Western United States modified from Shacklette and Boerngen (1984); bottom-sediment data were summarized by Severson and others (1987) for nine irrigation drainage reconnaissance investigations in the Western United States during 1986-87; baseline is the 95-percent expected range; all concentrations are in micrograms per gram; <, less than; --, no data] Trace Soils in Western United States Bottom-sediment element Geometric Range Baseline samples, 1986-87 mean Range Arsenic 5.5 <0.1-97 1.4-22 2.4-31 Barium 580 70-5,000 200-1,700 310-990 Beryllium .68 <1-15 .13-3.6 1.0-2.0 Boron 23 <20-300 5.8-91 .6-210 Cadmium Chromium 41 3-2,000 8.5-200 20-210 Cobalt 7.1 <3-50 1. 8-28 6.0-28 Copper 21 2-300 4.9-90 10-110 Lead 17 <10-700 5.2-55 9.0-52 Lithium 22 5-130 8.8-55 22-180 Manganese 380 30-5,000 97-1,500 200-3,000 Mercury .046 <.01-4.6 .0085-.25 <.02-18 Molybdenum .85 <3-7 .18-4.0 <2-40 Nickel 15 <5-700 3.4-66 11-170 Selenium .23 <.1-4.3 .039-1.4 <.1-85 Strontium 200 10-3,000 43-933 17 0-920 Thorium 9.1 2.4-31 4.1-20 <4.7-18.6 Uranium 2.5 .68-7.9 1.2-5.3 3.0-56 Vanadium 70 7-500 18-270 36-210 Zinc 55 10-2,100 17-180 49-510 The organochlorine compounds DDD and DDE were detected in the Gunnison River at small concentrations in the sample collected at site 11 (table 19). The DDE concentration of 2.8 ~g/kg for site 11 was the largest pesticide concentration in the bottom-sediment samples collected for this study. Chlordane and dieldrin also were detected in the sample from site 11. 47