Draft Environmental Impact Statement for Roca Honda Mine

Chapter 3. Affected Environment and Environmental Consequences
Hydrogeologic
Unit
Mancos
confining unit
Crevasse
Canyon aquifer 3
Transmissivity (feet
squared per day)
Range or
Value
Median Number
of tests
Storage
coefficient
Range or
Value
Number
of tests
Hydraulic
conductivity
(feet per
day)
Discharge (gallons per
minute)
Range or
Value
Number
Median
of wells
Specific capacity (gallons
per minute per foot of
drawdown)
Range or
Value
Median Number
of wells
– – – – – – 1–15 7 10 – – –
41 – 1 – – – 14 – 1 0.14 – 1
Gallup aquifer 15–390 124 20 0.000032–
0.000033
Dakota aquifer 44–2,000 85 3 0.00004–
0.000057
Morrison aquifer 2–490 135 39 0.00002–
0.0002
2 – 0.42–
645
42 49 0.12–2.10 0.46 13
2 0.03 2 1.25–75 12 30 0.03–3.67 0.06 13
9 0.025–0.39 1.3–
2,258
30 83 0.01–3.98 0.42 32
Entrada aquifer 50–400 4 – ? – – 0.5–5 8–616 105 8 0.33 – 1
Chinle confining
unit
13–144 100 5 – – – 1–500 35 28 0.1–0.75 0.43 4
1
Value from deep test hole near the center of the basin.
3
Not a regional hydrogeologic aquifer.
2 Value is an average from oil and gas test holes.
4 Value from Stone and other (1983, p.41) Data from Levings et al. (1996)
128 DEIS for Roca Honda Mine, Cibola National Forest