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 C12 GVMW-4A Water chemistry summary statistics
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Station Identification: GVMW 4A
Location: Grassy Valley
Station type: Groundwater
Period of record start: February 10, 1997
Period of record end: October 26, 2007

Laboratory Parameters
Units
Number of analyses Number of

non-detected values Maxiumum

value Minimum

value
Average Standard

deviation
Field Parameters
Depth to Water ft 66 0 28.88 15.32 23.39 3.20
Water Temperature C 33 0 11.8 4.0 5.9 1.3
Conductivity µmhos 31 0 1545 120 229 251
pH Su 33 0 11.7 6.3 7.0 1.0
Dissolved Oxygen mg/l 29 0 5.70 0.10 1.09 1.30
General Parameters
Total Dissolved Solids mg/l 31 0 131 75 105 20
Acidity mg/l 30 20 18.0 <1 7.5 4.4
Alkalinity as CaCO3 mg/l 17 0 67 49 57 5
Ammonia mg/l 31 31 <0.2 <0.05 <0.2 ID
Hardness mg/l 31 0 68 52 59 4
Total Suspended Solids mg/l 32 10 193 <10 26 42
Special Parameters
Cyanide, Free mg/1 31 31 <0.05 <0.01 <0.05 ID
WAD Cyanide mg/l 31 31 <0.01 <0.005 <0.01 ID
Major Anions
Bicarbonate ion (as CaCO3) mg/1 26 0 81 61 68 5
Carbonate ion (as CaCO3) mg/1 26 26 <10 <5 <10 ID
Chloride, Total mg/l 31 4 5.00 <0.5 0.96 0.91
Fluoride, Total mg/l 31 2 0.26 <0.314 0.20 0.02
Nitrate, Total mg/l 31 30 2.31 <0.05 0.10 0.41
Sulfate, Total mg/l 31 1 31.70 <10 22.35 5.18
Major Cations
Calcium, Total mg/l 31 0 17.00 10.10 12.77 1.93
Magnesium, Total mg/l 31 0 8.25 5.37 6.59 0.72
Potassium, Total mg/I 30 1 3.26 <0.5 1.11 0.61
Sodium, Total mg/l 30 0 7.71 6.03 6.87 0.41
Trace Metals
Arsenic, Total recoverable mg/1 27 27 <0.005 <0.005 <0.005 ID
Cadmium, Dissolved ML I 31 <0.001 <0.0001 <0.00 I ID
Chromium, Total recoverable -
mg/1 0 0 NA NA NA NA
Copper, Dissolved mg/l 31 29 0.019 <0.005 0.003 0.003
Iron, Dissolved mg/l 30 1 8.71 <0.05 5.30 1.89
Iron, Total recoverable mg/1 26 0 12.90 3.60 6.82 2.35
Lead, Dissolved mg/l 31 30 0.0025 <0.001 0.0007 0.0006
Manganese, Dissolved mg/1 30 0 1.94 0.62 1.19 0.28
Mercury, Total mg/1 31 31 <0.001 <0.0001 <0.001 ID
Nickel, Dissolved mg/l 31 31 <0.01 <0.005 <0.01 [D
Selenium, Dissolved mg/l 31 31 <0.005 <0.005 <0.005 ID
Silver, Dissolved mg/l 30 30 <0.001 <0.0005 <0.001 ID
Zinc, Dissolved mg/I 31 28 0.11 <0.005 0.03 0.02
NA: Not analyzed
ID: Insufficient data
Nondetects set to V, detection limit for calculations
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