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------------------- Table 32. Summary of water quality for Field Trip 3 of the 1990 Dolores River Study. Near Sllckrock Near Above conOuence Below connuence Near connuence San Miguel (RM (122.6) Bedrock w/San Miguel w/San Miguel w/Colorado River River above (RM 74.9) River River (RM 1.3) Dolores ConOu- LOCATION (RM 64.6) (RM 59.7) ence (RM 0.1) Sample 10: 3-WQ1 3-WQ4 3-WQ2 3-WQ3 3- WQ6A 3- WQ5 Trip 3 Parameter Sep. 24- Alkalinity as Caco3 (T), mgli 122 124 92.1 127 114 132 Oct. 2, Hardness as Caco3, ag/i 150 189 141 326 678 528 1990 pH Unit 8.33 8.35 8.27 8.45 8.37 8.45 IDS, mg/i 270 439 518 592 1.620 666 Ammonia as NH3-N, mg/i 0.28 0.13 0.25 0.34 0.10 0.44 Nitrate as N03_N, mg/i 0.06 0.14 0.45 0.43 0.69 0.16 Phosphate as P04_p (T), mg/i 0.013 1.23 3.19 2.03 0.75 0.042 Ortho Phosphate asP04-p, mg/i 0.Q15 0.024 0.010 0.016 0.016 <.01 Copper as Cu (T), mgli <.01 0.030 0.148 0.060 0.015 <.01 Iron as Fe (T), mg/i 0.67 24.2 32.8 29.6 14.5 4.45 Lead as Pb (T), mg/i <.01 0.055 0.098 0.098 0.035 0.045 Zinc as Zn (T), mg/i 0.020 0.083 0.148 0.133 0.058 0.040 Copper as Cu (D), mg/i <.01 <.01 <.01 <.01 <.01 <.01 Iron as Fe (D), mg/i 0.52 3.42 0.21 0.31 3.08 1.62 Lead as Pb (D), mg/i <.01 0.020 0.080 0.080 <.01 <.01 Zinc as Zn (D), mg/i <.01 <.01 <.01 <.01 <.01 <.01 Oil & Grease, mgll <.5 <.5 <.5 <.5 <.5 <.5 TSS, mg/i 32 1,730 4,610 3,800 1,020 275