2008-04-15_REVISION - M1980244 ‎(295)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 4/15/2008
• Doc Name: VOL II Appendix 2, Attachment C- Grassy Valley Hydrologic Monitoring DFata Summaries
• From: CC&V
• To: DRMS
• Type & Sequence: AM9
• Media Type: D
• Archive: No

Table C10 GVMW-2B Water chemistry summary statistics
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Station Identification: GVMW 26
Location: Grassy Valley
Station type: Groundwater
Period of record start: March 7, 1994
Period of record end: October 25, 2007

Laboratory Parameters
Units
Number of analyses Number of nondetected
values Maximum
value Minimum
value
Average Standard
deviation
Field Parameters
Depth to Water ft 130 0 30.5 18.3 23.93 3.34
Water Temperature C 112 2 45.4 <6.2 8.2 5.9
Conductivity µmhos 108 0 463 4.29 256 83
pH su 110 0 667 5.52 18.1 88.7
Dissolved Oxygen mg/l 90 0 284 4.4 13.75 40.99
General arameters
Total Dissolved Solids mg/l 88 0 320 117 215 51
Acidity, mg/1 mg/l 90 74 40 <1 4.8 6.7
Alkalinity as CaCO3 mg/l 64 2 24 <10 16.12 4.50
Ammonia mg/1 92 84 2.9 <0.05 0.14 0.42
Hardness mg/l mg/l 92 0 135 34 73 26
Total Suspended Solids mg/l 92 8 930 <5 168 224
Special Parameters
Cyanide, Free mg/l 96 92 1.4 <0.01 0.05 0.20
WAD Cyanide mg/l 96 4 2.4 <0.01 0.10 0.34
Major Anions
Bicarbonate ion (as CaCO3) mg/l 90 0 39 7 21 5
Carbonate ion (as CaCO3) mg/l 80 78 5 <0 3.63 1.37
Chloride, Total mg/l 92 2 62.5 <5 11.79 14.30
Fluoride, Total mg/l 92 38 0.7 <0.5 0.40 0.13
Nitrate, Total mg/l 92 0 12.4 1.1 5.1 2.0
Sulfate, Total 92 0 120 40.1 64.97 17.10
Major Cations
Calcium, Total mg/l 92 0 41.7 9.2 21.07 8.03
Magnesium, Total mg/l 84 0 9.6 2.5 5.19 1.70
Potassium, Total mg/l 84 0 13.5 1.78 3.40 1.96
Sodium, Total mg/l 84 0 31.9 15 20.94 3.48
Trace Metals
Arsenic, Total recoverable mg/1 68 60 0.012 <0.005 0.003 0.002
Cadmium, Dissolved mg/l 92 22 0.0027 <0.001 0.001 0.001
Chromim, Total recoverable mg/1 0 0 NA NA NA NA
Copper, Dissolved mg/I 92 2 0.11 <0.005 0.016 0.016
Iron, Dissolved mg/1 92 6 0.563 <0.04 0.16 0.14
Iron, Total Recoverable mg/1 90 0 32 0.26 4.81 6.20
Lead, Dissolved mg/l 92 70 0.006 <0.001 0.002 0.001
Manganese, Dissolved mg/l 92 40 0.13 <0.005 0.03 0.02
Mercury, Total mg/l 72 36 0.054 <0.0001 0.002 0.009
Nickel, Dissolved mg/l 92 72 0.06 <0.005 0.008 0.010
Selenium, Dissolved mg/l 92 90 0.0125 <0.005 0.003 0.002
Silver, Dissolved mg/l 92 86 0.08 <0.0001 0.002 0.012
Zinc, Dissolved mg/l 92 32 0.129 <0.02 0.037 0.024
NA: Not analyzed
ID: Insufficient data
Nondetects set to '/: detection limit for calculations
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