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 C9 GVMW-2A Water chemistry summary statistics
•
•
Station Identification: GVMW 2A
Location: Grassy Valley
Station type: Groundwater
Period of record start: March 7, 1994
Period of record end: September 23, 1999

Laboratory Parameters
Units
Number of analyses Number of
non-detected values Maxiumum
value Minimum
value
Average Standard
deviation
Field Parameters
Depth to Water ft 60 0 61.70 19.70 33.03 14.14
Water Temperature C 63 0 58.2 3.5 9.0 10.2
Conductivity µmhos 61 0 1999 22 256 305
pH su 63 1 7.4
<5.7
6.0
0.6
Dissolved Oxygen ML I 0 9.90 0.90 5.86 2.47
General Parameters -
Total Dissolved Solids mg/1 62 0 530 47 180 95
Acidity mg/l 63 50 38.0 <1 4.7 7.4
Alkalinity as CaC03 mg/I 44 4 32
<5
14
7
Ammonia mg/I 64 60 3.70
<0.05
0.20
0.56
Hardness mg/l 64 0 120 18 52 24
Total Suspended Solids mg/l 64 4 2000 <5 191 422
Special Parameters
Cyanide, Free mg/l 64 61 1.90 <0.01 0.08 0.29
WAD Cyanide mg/l 64 25 1.20 <0.005 0.05 0.20
Major Anions
Bicarbonate ion (as CaC03) mg/l 64 11 39 <5 16 9
Carbonate ion (as CaC03) mg/1 54 54 <10 <5 <10 ID
Chloride, Total mg/1 63 7 35.00 <0.5 6.06 6.23
Fluoride, Total mg/l 63 31 0.60 <0.05 0.29 0.11
Nitrate, Total mg/1 64 0 10 0.55 3.54 2.09
Sulfate, Total mg/I 63 0 120 11.00 54.31 21.83
Major Cations
Calcium, Total mg/l 64 0 36 4.60 14.62 7.11
Magnesium, Total mg/1 60 0 8.20 1.20 3.74 1.77
Potassium, Total mg/l 60 0 10 1.00 2.80 1.92
Sodium, Total mg/l 60 0 35 2.20 16.25 6.78
Trace Metals
Arsenic, Total recoverable mg/1 48 45 0.005 <0.005 0.003 0.001
Cadmium, Dissolved mg/1 64 16 0.009 <0.0002 0.002 0.001
Chromium, Total recoverable of 0 0 NA NA NA NA
Copper, Dissolved mg/l 64 8 0.150 <0.005 0.014 0.022
Iron, Dissolved mg/l 64 10 0.59 <0.04 0.11 0.12
Iron, Total recoverable mg/l 64 0 56.00 0.13 6.58 13.12
Lead, Dissolved mg/l 64 41 0.0080 <0.001 0.0026 0.0015
Manganese, Dissolved mg/1 64 26 0.09 <0.012 0.03 0.02
Mercury, Total mg/I 48 30 0.0660 <0.0001 0.0037 0.0140
Nickel, Dissolved mg/l 64 53 0.08 <0.005 0.01 0.01
Selenium, Dissolved mg/1 64 61 0.0250 <0.005 0.0038 0.0047
Silver, Dissolved mg/1 64 57 0.06
<0.0001
0.003
0.01
Zinc, Dissolved mg/l 64 23 0.09 <0.01 0.03 0.02
NA: Not analyzed
/D. fnsui7icient data
Nondetects set to Y, detection limit for calculations
.7