2008-01-14_HYDROLOGY - M1977215

• Permit No: M1977215
• IBM Index Class Name: HYDROLOGY
• Doc Date: 1/14/2008
• Doc Name: Water quality monitoring in Windy Gulch
• From: Water Management Consultants
• To: Homestake Mining Co. of California
• Email Name: RCO
• Media Type: D
• Archive: No

Mr. Alan Cox
November 30, 2007
Table 2 2006 Windy Gulch water quality
Page 3
Parameter Agricultural standard Average at
Lower Weir ~'~ Upper Weir

4/27/06 Lower Weir

4/27/06
luminum total (mg/1) None 0.36 0.36 0.06
senic dissolved (mg/1) 0.0027 0.0149
senic total (mg/l) 0.10 0.038 0.0027 0.0127
Cadmium dissolved (mg/1) <0.005 <0.005
Cadmium total (mg/1) 0.010 0.017 <0.005 0.008
Copper dissolved (mg/1) <0.01 <0.01
Copper total (mg/1) 0.20 0.01 <0.01 <0.01
ron dissolved (mg/l) 0..21 <0.02
ron total (mg/1) None 0.48 0.35 0.03
anganese dissolved (mg/I) 0.046 <0.005
anganese total (mg/1) 0.20 0.144 0.053 <0.005
ercury dissolved (mg/l) <0.0002 <0.0002
ercury total (mg/1) None <0.0002 <0.0002 <0.0002
inc dissolved (mg/1) <0.01 1.70
inc total (mg/1) 2.0 3.85 <0.01 1.82
H (units) None 6.6 7.6 7.2
Conductivity.(umhos/cm) None ~ 371 64 276
DS (mg/1) None 278 60 180
SS (mg/I) None 5 <5 8
Sulfate m 1 None 159 10 60
(1) Average from 16 samples taken since 1998 prior to final reclamation activities
Table 3 2005 Windy Gulch water quality
Parameter Agricultural
Standard Average at
Lower Weir ~`~

4/20/05 Upper Weir

5/10/OS

5/25/05

4/20/05 Lower Weir

5/10/OS

5/25/05
luminum total (mg/1) None 0.36 1.70 1.49 1.26 0.40 0.97 0.77
senic dissolved (mg/1) 0.0016 <0.003 0.0023 0.0133 0.0158 0.0195
senic total (mg/1) 0.10 0.038 0.0021 0.0022 0.0024 0.0118 0.0193 0.0220
admium dissolved (mg/1) <0.005 <0.005 <0.005 0.013 <0.005 0.006
admium total (mg/1) 0.010 0.017 <0.005 <0.005 <0.005 0.015 <0.005 0.005
opper dissolved (mg/I) <0.01 <0.01 0.08 0.02 <0.01 <0.01
opper total (mg/l) 0.20 0.01 <0.01 <0.01 <0.01 <0.01 <0.01 0.01
ron dissolved (mg/1) 0.15 0.11 0.13 0.05 0.10 0.10
ron total (mg/1) None 0.48 1.08 0.98 0.67 0.21 0.62 0.47
anganese dissolved (mg/1) 0.022 0.006 0.025 0.034 0.057 0.047
anganese total (mg/1) 0.20 0.144 0.048 0.032 0.029 0.037 0.057 0.047
ercury dissolved (mg/1) <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002
ercury total (mg/l) None <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002
inc dissolved (mgft) <0.01 <0.01 0.09 3.12 0.97 0.89
inc total (mg/1) 2.0 3.85 <0.01 <0.01 <0.01 3.24 1.00 0.96
H (units) None 6.6 7.0 7.4 7.7 6.5 7.0 7.5
onductivity (umhos/cm) None 371 60 47 58 310 125 132
DS (mg/1) None 278 70 60 80 240 100 130
SS (mg/1) None 5 6 12 <5 <5 10 <5
Sulfate m 1 None 159 50 <10 <10 150 40 40
(1) Average from 16 samples taken since 1998 prior to final reclamation activities