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Show Ecological Risk Assessment Northern Oquirrh Mountains diminished grazing pressure during the course of the study resulted in increased ground cover. 2.3 Characterization of Exposure Based on the Conceptual Site Models, the primary route of exposure for most terrestrial wildlife is expected to be through the food chain. This section describes the site-specific data on CoC concentrations in the soil, plants, and animal tissues that compose vertebrate diets. 2.3.1 CoC Concentrations in Soil, Plants, and Wildlife Concentrations of CoC were measured in soil, several plants species, herbivorous and carnivorous invertebrates, and small mammal livers and whole bodies. Although the concentrations in soil reflect the total extractable concentration of the CoC, the fraction that is bioloqically available to flora and fauna is affected by several factors, including soil pH and concentrations of other metals. 2.3.1.1 CaC concentrations in soil In the 1995 sampling, the highest concentrations of As, Cd, Pb, and Zn were measured in Pine Canyon (Table 8). Concentrations of Cu were highest at sampling sites in Black Rock Canyon. Overall Cu concentrations in 1995 were similar to concentrations found in 1994, except in Coon and Kessler Canyons where concentrations were lower than the 1994 canyon means, but similar to the closest sampling site from 1994 (Appendix 4). Selenium concentrations in soils were higher in Little Valley Wash and Kessler and Pine Canyons than in Coon and Black Rock Canyons. A comparison of the soil concentration of CoC at each sampling site to concentrations measured in 1994 (Le., closest site, elevation mean within canyon, canyon mean, and canyon 95% upper confidence limit (UCL) of the mean) is found in Appendix 4. (ppm, dry weight), pH, and percent total organic carbon from composite soil samples collected at each sampling Table 8. Concentration of CoC site in 1995. Site Soil % Total Organic Arsenic Cadmium II Copper Lead Selenium Zinc 75 pH Carbon CC1 6.49 0.73 30 5.0 80 89 3.9 CC2 6.49 1.28 20 5.0 34 31 0.9 77 LV1 6.26 1.83 68 4.2 429 259 11.2 125 II LV2 6.40 1.01 43 4.1 255 119 4.6 109 KC1 7.40 0.62 17 2.9 102 27 6.1 41 KC2 7.19 1.14 24 4.9 112 33 8.7 62 BR1 7.31 0.73 42 4.3 1000 304 1.3 165 BR2 7.96 0.42 65 3.3 758 215 3.1 151 PC1 5.89 1.20 114 30.1 101 243 7.4 534 PC2 5.83 1.65 166 27.6 263 941 5.7 583 PC3 6.07 0.74 166 37.6 267 808 5.4 677 ecological planning and toxicology, inc. 41 |
