Draft Environmental Impact Statement for Roca Honda Mine

Chapter 3. Affected Environment and Environmental Consequences
Table 11. Estimated storm water runoff for developed and undeveloped conditions
Subbasin
Area
(acres)
Discharge
(cfs)
Volume
(ac-ft)
Developed
Discharge per
Acre
Undeveloped
Discharge per
Acre
101 10.8 42 1.46 3.89 3.89
102 18.9 64 2.55 3.39 3.39
103 21.9 79 2.96 3.61 3.61
104 35.4 98 4.77 2.77 2.77
105 31.6 102 3.68 3.23 3.23
106 1 626.5 595 66.64 0.95 0.92
107 1 499.8 814 60.6 1.63 1.55
108 82.8 185 9.65 2.23 2.23
109 1 54.1 204 6.58 3.77 2.78
110 1 224.2 457 26.88 2.04 1.81
111 1 23.3 88 2.83 3.78 3.67
112 5.5 20 0.65 3.64 3.64
113 42.9 112 4.54 2.61 2.61
114 58.8 159 5.92 2.70 2.70
115 15.8 39 1.27 2.47 2.47
116 13.0 52 1.67 4.0 4.0
117 15.9 58 1.86 3.65 3.65
118 20.1 77 2.45 3.83 3.83
119 75.6 219 8.82 2.90 2.90
120 88.5 206 10.32 2.33 2.33
121 140.3 366 16.36 2.61 2.61
122 1 154.2 527 19.41 3.42 1.27
123 474.5 620 55.32 1.31 1.31
124 9.2 34 1.07 3.60 3.60
125 244.5 423 28.51 1.73 1.73
Source: Attachment 2, MOP Rev 1;
1 Sum of values for subbasin number from RHR Mine Operations Plan Revision Attachment 2, Jan 2011
In addition to storm water impacts on disturbed land, the installation of dewatering wells,
ventilation holes, and escape shafts would be accomplished with drilling rigs or boring machines.
Pits to hold drilling mud for recirculation are anticipated to be excavated. Drilling mud pits can
be of concern to surface water quality, in the event of overtopping or flooding. Construction,
operation, and restoration of the mud pits are expected to be in compliance with the Pit Rule
(19.15.17 NMAC).
152 DEIS for Roca Honda Mine, Cibola National Forest