Site As Cd Cr Cu Pb Hg Ni Zn ARC 1a 6.48 0.835 58.7 71.5 64.2 0.139 42.1 341 ARC 1 4.99 1.023 52.8 60.5 55.4 0.107 37.2 288 ARC 2 3.31 0.236 22.4 36.7 10.8 0.010 31.2 73.5 ARC 3 2.39 0.134 24.6 16.9 16.3 0.024 15.1 59.1 ARC 4 2.67 0.113 35.4 32.0 6.81 0.010 35.5 85.7 ARC 5 3.04 0.060 33.5 17.3 5.58 0.010 23.2 45.0 ARC 6 2.20 0.062 25.2 14.3 6.98 0.016 14.7 42.7 ARC 7 9.87 0.110 49.5 33.4 8.98 0.017 49.1 67.6 ARC 8 4.92 0.083 49.1 29.5 10.1 0.016 43.6 68.4 ARC 9 3.72 0.113 44.3 28.5 8.59 0.020 38.2 65.2 ARC 10 2.70 0.052 37.2 18.7 5.89 0.015 29.6 43.8 GAB 1 7.57 1.231 72.0 49.3 28.5 0.089 81.3 308 GAB 2 6.42 1.071 54.9 39.5 30.0 0.133 55.8 232 GAB 3 8.71 0.939 55.9 39.0 20.8 0.054 42.9 225 GAB 4 4.79 0.361 24.8 19.2 7.56 0.055 15.6 102 GAB 5 4.43 0.338 24.8 17.9 8.34 0.044 14.1 109 NAT 1 6.55 0.443 29.9 24.3 11.2 0.045 21.1 121 NAT 2 5.21 0.344 27.2 18.5 8.18 0.030 19.0 85.4 NAT 3 5.97 0.331 27.3 23.0 8.42 0.030 18.8 93.6 NAT 4 7.30 0.398 41.3 18.9 11.1 0.032 26.5 90.7 ALS 1 8.39 1.130 68.5 45.8 46.1 0.073 55.7 229 ALS 2 8.64 0.823 45.0 36.8 16.6 0.032 27.1 250 ALS 3 7.82 0.640 37.1 29.3 13.3 0.035 27.1 144 ALS 4 7.31 0.951 44.0 25.5 12.8 0.040 42.1 132 TEL 5.9 0.596 37.3 35.7 35 0.174 18 123.1

Table 4: Three year mean bulk metal concentrations in sediment (μg/g dw) for sites sampled in Arcade Creek in Sacramento, California and in Salinas streams, Salinas, California in spring 2009-2011. Metals concentrations exceeding Threshold Effects Levels (TELs) are in bold.