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Table C7 COBA B Water chemistry summary statistics <br /> <br /> <br />Station Identification: COB 1B <br />Location: Grassy Valley <br />Station type: Groundwater <br />Period of record start: April 2, 1997 <br />Period of record end: October 31, 2007 <br /> <br />Laboratory Parameters <br />Units <br />Number of analyses Number of <br />non-detected values Maxiumum <br />value Minimum <br />value <br />Average Standard <br />deviation <br />Field Parameters <br />Depth to Water ft 49 0 43.50 27.53 34.40 4.51 <br />Water Temperature C 44 0 15.2 4.8 7.8 1.8 <br />Conductivity gmhos 43 0 640 166 312 86 <br />pH su 44 0 9.2 5.8 6.3 0.5 <br />Dissolved Oxygen mg/1 40 0 4.00 0.10 0.97 0.97 <br />General Parameters <br />Total Dissolved Solids mg/1 41 0 456 111 191 58 <br />Acidity mg/1 43 25 .18.0 <10 8.0 3.9 <br />Alkalinity as CaC03 mg/t 21 0 36 14 21 6 <br />Ammonia mg/1 43 43 <0.05 <0.05 <0.05 ID <br />Hardness mg/l 43 0 254 53 110 30 <br />Total Suspended Solids mg/1 43 9 502 <10 38 77 <br />Special Parameters <br />Cyanide, Free mg/i 43 43 <0.01 <0.01 <0.01 ID <br />WAD Cyanide mg/I 43 43 <0.01 <0.01 <0.01 ID <br />Major Anions <br />Bicarbonate ion (as CaC03) mg/1 34 0 43 18 26 7 <br />Carbonate ion (as CaC03) mg/l 34 33 5 <0 5 1 <br />Chloride, Total mg/l 43 17 4.00 <0.5 0.79 0.90 <br />Fluoride, Total mg/1 43 0 0.26 0.12 0.16 0.03 <br />Nitrate, Total mg/1 43 39 0.09 <0.05 0.03 0.02 <br />Sulfate, Total mg/l 43 0 275.00 51.60 113.33 33.22 <br />Major Cations <br />Calcium, Total mg/1 43 0 68.00 10.10 21.64 8.32 <br />Magnesium, Total mg/1 43 0 20.90 6.63 13.41 2.82 <br />Potassium, Total mg/I 43 0 7.89 0.86 2.04 1.23 <br />Sodium, Total mg/1 43 0 15.00 8.57 10.03 1.16 <br />Trace Metals <br />Arsenic, Total recoverable mg/1 34 34 <0.005 <0.005 <0.005 ID <br />Cadmium, Dissolved mg/1 43 40 0.001 <0.001 0.001 0.0001 <br />Chromium, Total recoverable mg/1 0 0 NA NA NA NA <br />Copper, Dissolved mg/1 43 43 <0.005 <0.005 <0.005 ID <br />Iron, Dissolved mg/1 43 2 6.65 <0.05 2.48 2.06 <br />Iron, Total recoverable mg/1 34 0 13.80 1.93 5.43 2.47 <br />Lead, Dissolved mg/1 43 40 0.0020 <0.001 0.0006 0.0002 <br />Manganese, Dissolved mg/1 42 0 10.00 0.34 2.22 1.59 <br />Mercury, Total mg/1 43 43 70.001 <0.0002 <0.001 ID <br />Nickel, Dissolved mg/1 43 0 0.07 0.01 0.03 0.01 <br />Selenium, Dissolved mg/1 43 43 <0.005 <0.005 <0.005 ID <br />Silver, Dissolved mg/1 43 43 <0.001 <0.001 <0.001 ID <br />Zinc, Dissolved mg/1 43 1 0.37 <0.05 0.18 0.08 <br />NA: Not analyzed <br />ID: Insufficient data <br />Nondetects set to %: detection limit for calculations <br />•