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Table 1 Selected major and trace element dissolved constituents in water from several locations in the LCMS

From: Arsenic species in weathering mine tailings and biogenic solids at the Lava Cap Mine Superfund Site, Nevada City, CA

Analyte pH SpC1 DO2 Alk3 Fe total Fe2+ Fe3+4 Astotal inorganic As3+ As5+by difference As5organic Ca Cl SO4
Units -log[H+] μS6 mg/L mg/L mg/L mg/L mg/L μg/L μg/L μg/L μg/L mg/l mg/L mg/L
Detection Limit ±0.1 ±1% varies7 ±5% 0.002 0.002 0.002 0.012 0.012 0.012 0.012 0.3 0.08 0.05
LCD, Mine Adit
99 7.3 417 1 151 0.719 0.676 0.043 459 183 276 n.d 66.8 1.3 58
00 7.2 413 0.8 147 0.769 0.679 0.09 355 126 229 0.10 65.3 0.9 66
Lost Lake Sites              
LL5               
99 8.5 74.0 8 28.9 0.451 0.047 0.404 66.8 9.66 57.1 1.68 7.15 3.7 1.8
99-PW8 7.0 188 n.d. 83.7 10.7 7.02 3.68 3250 3250 0 0.95 26.3 6.5 0.6
00 9.4 43.1 8 12.6 0.088 0.01 0.078 17.9 1.31 16.59 1.51 2.90 3.3 1.4
00-PW n.d. 164 n.d. n.d. 0.845 0.605 0.24 45.1 25.9 19.2 0.76 22.0 5 10
00-R9 7.0 103 5 37.9 0.399 0.076 0.323 36.8 29.8 7.0 n.d 11.3 5 1.9
LL6               
99 8.6 71.0 8 27.9 0.401 0.026 0.375 86.7 16.2 70.5 1.68 6.8 3.6 1.6
00-R 8.5 95.6 7 40.1 0.51 0.039 0.471 44.1 5.90 38.2 1.32 8.2 4.8 1.3
99-PW 7.2 275 n.d n.d. 7.01 5.53 1.48 31.3 36.7 0 5.33 n.d. n.d. n.d.
00-PW n.d. 204 n.d n.d. 0.923 0.877 0.046 38.1 26.5 11.6 0.58 31.0 4 9.3
LL12               
99 8.0 71.0 8 25.8 0.379 0.072 0.307 65.8 4.4 61.4 1.44 6.6 3.6 1.7
99-PW 7.0 285 n.d. 145 16.5 14.3 2.2 1580 220910 0 0.65 32.4 7.1 0.5
00 7.1 39.9 n.d. 12.1 0.075 0.01 0.065 9.08 1.73 7.35 0.91 2.8 3.4 1.4
00-PW n.d 412 n.d. n.d. 7.80 7.429 0.371 1090 566 524 1.66 48.0 6.2 5.0
00-R 7.3 95.7 6 36.6 0.406 0.028 0.378 36.1 5.03 31.07 1.17 9.0 4.8 1.2
00-R-PW 7.7 339 1 164 0.859 0.854 0.005 2050 1880 170 1.70 34.0 7.5 0.6
LL2, Pond In tailings
99 7.8 372 8 194 0.008 b.d 0.008 440 3.1 437 n.d 65.5 0.9 3.0
99-R 8.1 362 7 183 0.008 0.004 0.004 1340 6.1 133 n.d 59.5 1.0 1.9
00 7.6 374 7 199 0.018 0.008 0.010 614 4.38 609.62 3.11 59.1 0.6 2.0
00-R 7.6 362 7 182 0.009 0.005 0.004 533 5.64 527 0.74 62.7 0.7 2.3
LL1 Seep at base of Lost Lake Dam
98 6.7 186 1 79.9 5.74 5.24 0.5 78.6 0.97 77.6 b.d 19.6 1.8 7.4
99 6.2 62 5 22.3 0.053 0.052 0.001 1.1 0.8 0.3 n.d 7.90 1.3 3.6
99-R 6.5 88 0.3 77.8 5.53 5.5 0.03 92.4 97.2 0 n.d 18.7 1.9 6.1
99-R2 6.5 178 0.4 78.8 5.15 4.51 0.64 92.4 77.9 14.5 b.d 19.2 2.2 6
00 6.7 198 0.1 89.1 6.251 5.345 0.906 61.8 69.6 0 0.07 20.5 1.7 9.4
00-R 6.6 188 0.2 78.5 5.77 5.78 0 85.1 85.0 0.1 b.d. 21.7 2.4 6.8
LL10 approximately 75 meters downstream of LL1
99 7.0 158 5 71.1 1.77 1.56 0.21 43.2 42.4 0.8 b.d 19.7 2.2 5.8
LL8 Background site upstream of mining impact
98 7.0 37.7 6 13.5 0.005 b.d. 0.005 0.098 0.025 0.073 b.d 3.4 1.6 2.3
99 6.5 38 8 12.8 b.d. b.d. b.d. 0.091 0.019 0.072 b.d 3.1 1.6 2.3
00-R 6.8 39.8 8 15.7 b.d n.d. n.d. 0.159 n.d. 0.159 b.d 3.3 1.8 2.2
  1. Analytical methods are described in the text. Estimated lower limits of detection 5s method blank values are given for each analyte except pH, specific conductivity, and alkalinity (standard error given).1 Specific conductivity; 2 Dissolved oxygen; 3. Alk = alkalinity, caclulated as CaCO3; 4 determined by difference; 5 including mono-, di-, and tri-methyl arsenic compounds as well as other unidentified arsenic species; 6 μS = microSiemens; 7 ± 0.1 when value is ≤ 1.0; ± 1.0 when value is ≥1.0; 8 PW = pore water, extracted from sediment cores by centrifugation; 9R = repeat(not replicate) determination (same year, different collection date); 10 Due to analytical error, As(III) values are occasionally greater than the total inorganic As value, especially when the proportion of As(III) is near 100%.