PERMFILE67811

• Permit No: M1988112
• IBM Index Class Name: Permit File
• Doc Date: 11/8/1988
• Section_Exhibit Name: EXHIBIT G WATER INFORMATION
• Media Type: D
• Archive: No

' Based on experience with similar types of material, the
vuggy zones and fracture system were estimatf~d to have a
' porosity of 30 to 35 percent. The estimated vo ume of water
in storage in the West Pit is approximately 2,400 to 2,800 ac-
ft. The dr
i
d
d ainable porosity (specific yield) of -
t
b hese systems
s ju
ge o
e approximately 50 percent of t he porosity,
therefore, the drainable water volume in the West Pit is
estimated to be ],200 to 1,400 ac-ft.
In the East Pit, a total volume of water in storage of
approximately 240 to 280 ac-ft is expected, with a
' corresponding drainable volume of approximately 120 to 140 ac-
ft.
In addition to core holes that were converted to
monitoring wells within the East and West Pits, monitoring
' wells were installed in the plant site area to evaluate ground
water quality in this area. Four monitoring wells were
installed (M-2, M-3, M-4 and M-5) to monitor uP3radient and
downgradient groundwater conditions in the vicinity of the
leach pad area and south waste rock disposa area. The
locations of these monitoring wells are shown in Figure G-1,
and the generalized construction details for these wells are
t shown in Figure G-3.
These monitoring wells were constructed to intersect the
uppermost aquifer in this vicinity, the Santa Fe Conglomerate.
' The downgradient well, M-4, intersected water in the Santa Fe
Conglomerate at less than 100 ft. However, the upgradient well,
' M-3, did not intercept any water for the total cepth of 100
ft. Based on geophysical logs generated for a condemnation hole
drilled to a depth of 1,000 ft adjacent to M-3, depth to water
' in this area is in excess of 400 ft. Wells M-2 and M;~ were
also dry for the total depth of 100 ft. A condemnation hole
t drilled adjacent to M-2 exhibited water at 125 ft.

G-37
1