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 C14 GVMW-7A Water chemistry summary statistics
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Station Identification: GVMW 7A
Location: Grassy Valley
Station type: Groundwater
Period of record start: June 19, 1998
Period of record end: October 26, 2007
Number of Maxiumum Minimum
Average Standard
Laboratory Parameters Units Number of analyses non-detected values value value deviation
Field Parameters
ft 33 0 44.14 5.52 19.52 9.46
Depth to Water
Water Temperature C 31 0 8.6 6.2 6.9 0.6
Conductivity µmhos 30 0 422 223 340 45
PH su 31 0 7.7 6.9 7.2 0.2
Dissolved Oxygen ML I-- 0 3.70 0.00 0.55 1.10
General Parameters
Total Dissolved Solids mg/1 26 0 248 181 206 13
Acidity mg/1 27 19 16.0 <10 7.2 3.7
Alkalinity as CaC03 mg/l 13 0 167 148 155 6
Ammonia mg/l 29 28 0.05 <0.05 0.03 0.00
Hardness mg/l 29 0 197 148 166 11
Total Suspended Solids mg/1 29 29 <10 <10 <10 ID
Special Parameters
Cyanide, Free mg/l 29 28 0.01 <0.01 0.01 0.00
WAD Cyanide mg/l 29 28 0.01 <0.01 0.01 0.00
Major Anions
Bicarbonate ion (as CaC03) mg/l 18 0 206 179 191 7
Carbonate ion (as CaC03) mg/l 18 18 <10 <10 <10 ID
Chloride, Total mg/1 29 0 7.50 5.50 6.64 0.47
Fluoride, Total mg/l 29 0 0.68 0.55 0.60 0.03
Nitrate, Total mg/1 29 28 0.05 <0.05 0.03 0.00
Sulfate, Total mg/l 29 0 29.50 13.80 22.25 3.85
Major Cations
Calcium, Total mg/l 29 0 46.60 32.70 37.40 3.37
Magnesium, Total mg/l 29 0 19.50 15.10 17.72 0.98
Potassium, Total mg/1 27 0 1.39 0.60 0.78 0.15
Sodium, Total mg/l 27 0 10.40 8.17 9.11 0.56
Trace Metals
Arsenic, Total recoverable mg/1 18 18 <0.005 <0.005 <0.005 ID
Cadmium, Dissolved mg/l 29 28 0.001 <0.001 0.001 0.0001
Chromium, Total recoverable mg/l 0 0 NA NA NA NA
Copper, Dissolved mg/l 29 27 0.008 <0.005 0.003 0.001
Iron, Dissolved mg/1 29 0 1.04 0.14 0.86 0.23
Iron, Total recoverable mg/l 18 1 1.08 <0.588 0.84 0.24
Lead, Dissolved mg/1 29 28 0.0025 <0.001 0.0006 0.0004
Manganese, Dissolved ML I l 031 <0.05 0.20 0.05
Mercury, Total --
mg/1 29 28 0.0002 <0.0002 0.0001 0.00002
Nickel, Dissolved mg/1 29 28 0.01 <0.005 0.00 0.00
Selenium, Dissolved mg/1 29 28 0.0050 <0.005 0.0026 0.0005
Silver, Dissolved mg/l 29 28 0.001 <0.001 0.001 0.0001
Zinc, Dissolved mg/l 29 28 0.05 <0.05 0.03 0.005
NA: Not analyzed
ID: Insufficient data
Nondetects set to '/: detection limit for calculations
CJ