2019-12-13_REVISION - M1980244 (55)

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STORMWATER MANAGEMENT PLAN CRIPPLE •- GOLD MINING COMPANY Overburden storage may affect the quality of stormwater through erosion and transport of sediment if not managed and controlled properly Stormwater runoff from the OSAs is managed by controlling drainage and sediment using road sumps and other similar BMP structures or applications that provide detention and enhance sediment removal Runoff from other disturbed areas is managed similarly and diverted to BMPs and / or other engineered structures to control erosion. Sumps and other BMPs are shown on the attached Figures 2 through 18. Examples of typical BMPs and road sump pictures from CC&V are provided as Attachment 1. EMPs will be employed throughout the currently planned implementation of the Cresson Project. EMPs are ponds or systems of ponds that are designed to contain two times the runoff of a 10-year, 24-hour storm event. The existing EMPs are listed below and shown on the attached Figures. • EMP-006(Figure 2):The stormwater runoff system EMP-006 was originally located to collect runoff (1) from the Arequa Gulch OSA (which no longer exists), (2) from a portion of the Squaw Gulch OSA, (3)from the access roads for the Arequa Gulch VLF, and(4)from portions of mine haul roads, which, if there were overflow, would enter the Bateman Creek drainage. Note that Figure 2 shows EMP-006 and the locations of sumps which function together to control stormwater flows • EMP-011 (Figure 17): The stormwater runoff pond system, EMP-011, is located at the crushing facility. Any overflow from EMP-011 enters a diversion channel that surrounds the VLF • EMP-013 (Figure 12)- The EMP-013 collects runoff from the East Cresson Mine Area, portions of mine haul roads, soil stockpiles, and associated disturbance in Vindicator Valley. EMP-013 is shown on Figure 12. • EMP-008 a (Figure 6): EMP-008a is shown on Figure 6 for reference. This EMP, however, has been consumed by mining and no longer exists. Stormwater flows in this area report to internal mine pits and benches, or flow to EMP-008b. • EMP-008b and EMP-008c (Figure 8)- EMP-008b and EMP-008c collect runoff from the upper elevation North Cresson Mine Area roads, soil stockpiles, associated disturbance areas, a portion of the reclaimed Squaw Gulch OSA, interceptor canals above the Squaw Gulch VLF, and portions of mine haul roads. The EMP-008 system would overflow to Poverty Gulch. • EMP 009 a, b, c, & d (Figure 9): The stormwater runoff pond system, EMP-009a-d collects runoff from the North Cresson Mine Area, roads, soil stockpiles, associated disturbance areas, a portion of the Squaw Gulch OSA and portions of mine haul roads If there were overflow, the flows would report to Poverty Gulch.