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 C6 COB-1A Water chemistry summary statistics
P_.?
•
Station Identification: COB IA
Location: Grassy Valley
Station type: Groundwater
Period of record start: March 26, 1997
Period of record end: October 30, 2007
Laboratory Parameters Units Number of analyses Number of
non-detected values Maxiumum
value Minimu in
value Average Standard
deviation
Field Parameters
Depth to Water ft 49 0 43.50 23.78 31.22 4.88
Water Temperature C 45 0 8.6 4.1 5.5 0.8
Conductivity pmhos 43 0 1331 523 1003 183
pH so 45 0 6.8 4.1 6.2 0.4
Dissolved Oxygen mg/l 38 0 4.20 0.00 0.43 0.84
General Parameters
Total Dissolved Solids mg/1 41 0 1135 363 907 160
Acidity mg/1 43 0 192.0 14.0 154.5 29.5
Alkalinity as CaCO3 mg/1 20 2 32 <0 18 9
Ammonia mg/1 43 42 0.14 <0.05 0.03 0.02
Hardness mg/l 43 0 497 177 414 61
Total Suspended Solids Mg/1 43 17 97 <10 14 15
Special Parameters
Cyanide, Free mg/1 43 43 <0.01 <0.01 <0.01 ID
WAD Cyanide mg/1 43 43 <0.01 <0.01 <0.01 ID
Major Anions
Bicarbonate ion (as CaCO3) mg/1 34 0 39 10 26 9
Carbonate ion (as CaCO3) mg/1 34 33 5 <0 5 1
Chloride, Total mg/1 43 12 4.00 <0.5 0.87 0.83
Fluoride, Total mg/1 43 0 0.10 0.05 0.08 0.01
Nitrate, Total mg/1 43 43 <0.05 <0.05 <0.05 ID
Sulfate, Total mg/1 43 0 682.00 239.00 581.98 80.22
Major Cations
Calcium, Total mg/l 43 0 97.90 27.50 69.43 11.60
Magnesium, Total mg/1 43 0 70.70 22.80 58.34 10.44
Potassium, Total mg/1 43 0 3.09 1.31 2.24 0.32
Sodium, Total mg/1 43 0 17.00 11.50 13.28 0.97
Trace Metals
Arsenic, Total recoverable mg/1 34 34 <0.005 <0.005 <0.005 ID
Cadmium, Dissolved mg/1 43 41 0.001 <0.001 0.001 0.0001
Chromium, Total recoverable mg/1 0 0 NA NA NA NA
Copper, Dissolved mg/1 43 42 0.010 <0.001 0.003 0.001
Iron, Dissolved mg/1 43 0 112.00 1.62 82.81 23.66
Iron, Total recoverable mg/l 34 0 117.00 11.80 92.58 18.14
Lead, Dissolved mg/1 43 42 0.0010 <0.001 0.0005 0.0001
Manganese, Dissolved mg/1 42 0 54.00 0.28 31.82 9.63
Mercury, Total mg/l 43 43 <0.0002 <0.0002 <0.0002 ID
Nickel, Dissolved mg/1 43 0 0.26 0.05 0.15 0.04
Selenium, Dissolved mg/I 43 43 <0.005 <0.001 <0.005 ID
Silver, Dissolved mg/l 43 42 0.002 <0.001 0.001 0.0002
Zinc, Dissolved mg/1 43 1 1.96 <1 1.07 0.21
NA.- Not analvzed
/D. Insufficient data
Nondetects set to '/: detection limit for calculations