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 C2 GV-02 Water chemistry summary statistics
•

Station Identification: GV02
Location: Grassy Valley
Station type: Surface Water
Period of record start: July 9, 1996
Period of record end: November 8, 2007

Laboratory Parameters
Units
Number of analyses Number of

non-detected values Maxiumum

value Minimum

value
Average Standard

deviation
Field Parameters
Water Temperature C 53 0 22.9 0.1 10.0 6.3
Conductivity µmhos 53 0 3510 102 1031 761
pH, Field su 52 0 7.5 4.1 6.5 0.7
Dissolved Oxygen mg/I 50 0 11.90 0.60 6.74 2.43
General Parameters
Total Dissolved Solids mg/l 52 0 3400 123 881 740
Acidity mg/l 46 31 43 <1 9 9
Alkalinity as CaC03 mg/l 25 7 73 <0 17 16
Ammonia mg/I 53 49 0.40 <0.05 0.04 0.06
Hardness mg/l 53 0 1374 0 444 317
Total Suspended Solids mg/l 53 41 180 <10 11 25
Special Parameters
Cyanide, Free mg/l 53 53 <0.05 <0.01 <0.05 ID
WAD Cyanide mgA 53 53 <0.01 <0.005 <0.01 ID
Major Anions
Bicarbonate ion (as CaC03) mg/l 38 0 82 10 36 19
Carbonate ion (as CaC03) mgA 38 37 5 <0 5 1
Chloride, Total mg/l 53 5 17.50 <0.5 4.46 2.96
Fluoride, Total mg/l 53 0 19.00 0.73 5.01 4.26
Nitrate, Total mg/l 53 24 2.50 <0.05 0.28 0.53
Sulfate, Total mg/l 53 0 2462.00 54.90 564.53 509.56
Major Cations
Calcium, Total mg/l 53 0 303 16.7 112.7 71.0
Magnesium, Total mg/l 53 0 150 4.67 42.1 33.8
Potassium, Total mg/l 46 0 14.7 1.03 4.44 2.91
Sodium, Total mg/l 46 0 518 5.55 70.78 102.34
Trace Metals
Arsenic, Total recoverable mg/l 53 51 0.018 <0.005 0.003 0.003
Cadmium, Dissolved mg/l 53 33 0.011 <0.0002 0.002 0.002
Chromium, Total recoverable mg/l 15 13 0.002 <0.001 0.001 0.0004
Copper, Dissolved mg/l 53 44 0.025 <0.005 0.004 0.004
Iron, Dissolved mg/l 53 17 0.68 <0.02 0.12 0.14
Iron, Total recoverable mg/l 53 2 5.60 <0.05 0.48 0.86
Lead, Dissolved mg/I 53 49 0.0025 <0.001 0.0007 0.0006
Manganese, Dissolved mg/l 50 0 42.00 0.12 6.68 8.67
Mercury, Total mg/1 53 52 0.0001 <0.0001 0.0001 0.00001
Nickel, Dissolved mg/l 53 l0 0.40 <0.005 0.04 0.07
Selenium, Dissolved mg/l 53 51 0.0070 <0.005 0.0026 0.0007
Silver, Dissolved mg/l 53 51 0.0025 <0.0005 0.0006 0.0004
Zinc, Dissolved mg/l 53 11 8.09 <0.05 0.68 1.32
NA: Not analyzed
/D: Insufficient data
0