2013-09-27_REPORT - M1986102 (2)

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Feb. 15, 2013 Stormwater Management Plan (SWMP) For: Deep Creek Placer Located at: 201 Deep Creek Rd (Road 639), Old Town of Lime, San Miguel County Permit No.: COR340962 SWMP Administrator: Dan Collins (Owner /Operator). Dan.collins @asu.edu 480 - 206 -2037 1. Site Map (see attached map with legend addressing pertinent items): a. Mining site boundaries b. Access and haul roads c. Stormwater outfalls and an outline of the drainage area of each stormwater outfall d. An estimate of direction of flow e. Materials handling areas f. Each existing structural control measure to reduce pollutants in the stormwater runoff g. Areas used for storage or disposal of overburden, materials, soils or wastes h. Areas used for mineral milling and processing i. Springs, streams, wetlands and other surface waters j. Location of mine drainage or any other process water k. Boundary of tributary area that is subject to effluent limitations I. Date the map was prepared — Feb. 15, 2013 2. Description of Potential Pollutant Sources /Material Inventory As this is an inactive site that has been carefully maintained, there is very little potential for stormwater contamination. While equipment such as a small backhoe, a pickup truck, and a skip loader are occasionally brought on site for routine site maintenance, there is no active program for equipment repair /fueling /overhaul that pose risks to stormwater runoff. There is a 200 gal. tank of biodiesel, stored on an elevated steel framework, stored outside, and well above any active runoff area. Other fuels stored in approved, explosion -proof shed. Outside "equipment apron" adjacent to mine portals has been contoured to direct stormwater runoff to two outflows on site (see attached map). The entire area has been graded with limestone gravel leftover from earlier limestone mining activities. 3. Stormwater Quality Controls a. SWMP Administrator— Dan Collins, Owner /Operator. b. Materials Handling and Spill Prevention: As indicated, diesel storage is isolated from areas where surface runoff occurs. Incineration of waste materials collected on site and from immediately adjacent sites is tightly monitored and controlled (notification of local authorities precedes any major incineration event). Fuels (apart from biodiesel tank on stand) are stored in explosion proof steel shed. No toxic materials are stored on site. c. Erosion and Sediment Controls: Currently, stormwater is directed via surface contouring to ditches on the southern and northern edges of the site. On the south side, a small amount of surface runoff is largely absorbed by a very large talus slope leading down to a bermed access road above State Highway 145. No water has been observed flowing downhill as far as the bermed road (a distance of some 200 feet). On the north side, a small amount of surface water 1