2017-03-27_REVISION - M1981185 ‎(25)‎

• Permit No: M1981185
• IBM Index Class Name: REVISION
• Doc Date: 3/27/2017
• Doc Name Note: Exhibit G Water Resources
• Doc Name: Request For Amendment To Permit
• From: Sunrise Mining, LLC
• To: DRMS
• Type & Sequence: AM2
• Email Name: LJW
• Email Name: GRM
• Media Type: D
• Archive: No

Water Information-Amendment E
With the exception of total recoverable metals; surface and groundwater field
and laboratory analytes will be analyzed as prescribed and approved by DRMS. (Exhibit
U Attachment U-4 and U-5)
Point of Compliance(Section 3.1.7(6) and 3.2.7(7)(a)
The May Day No. 2 bench groundwater monitoring well is the designated"point of
compliance". The well is located(Figure G-1)downgradient of the May Day No. 1 and
No. 2 active mine area The CDRMS "point of compliance"for surface water is located
down gradient of the mine site and located on the La Plata River(Station SW-2).
6.4.7(2) Surface/Groundwater Characterization
(a) Map
The surface water bodies within the permit boundaries, and adjacent to the permit
area, are illustrated on in Exhibit C, Figure C-6.
b) Runoff Plan
Baseline mine site surface water drainage basin delineation is illustrated on
Exhibit G -Figure G-2. Detailed surface water flow characteristics for the 2, 10,
25 and 100 year storm peak flows and discharge flow velocities for the mine site
and associated structures are presented in the Storm Water Management Plan
(SWMP) as summarized in Exhibit U Attachment U-2.
(c)Known Aquifers (Rule 6.4.21(8)(a) and (b))
The permit area is located at the northern boundary of the San Juan
Hydrogeologic Basin (Topper et al., 2003). The Morrison Aquifer is the only
hydrogeologic unit of the San Juan Basin present within the permit area. Outside
of wells completed in the La Plata River alluvium; all water wells identified
within a 2-mile radius of the proposed May Day Idaho Mine Complex boundary
are completed in the Mancos Shale, the Dakota Sandstone or the Morrison
Formation. With the exception of the Morrison formation,the geologic units
capable of yielding water to a well are not present in the project area and all of the
geologic units are structurally above the geologic units within the study area.
There are no domestic or agricultural production wells completed with the permit
area
The May Day and Idaho mines are located within southward-dipping sedimentary
rocks cut by a series of east-west faults. The May Day Idaho Fault System
May Day and Idaho Mine Application
112(d)Permit
M-1981-185-Amendment
Revised March 10,2017
Exhibit G—Rule 6.4.7 Page 2 of 5