2014-12-02_REPORT - M1986102 (3)

Home Browse Search

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 Stormwater exiting the site is minimal. However, there are small outflows that exit the site as follows: a. top of the access road: Latitude: 37.95640 Longitude: - 107.93112 b. south side of equipment apron: Latitude: 37.95623 Longitude: - 107.93138 2. Activity Description: 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. SIC code: 1422 4. Process water or stormwater: Most outfall is the result of storm water falling on the site. No process water is being used with respect to limestone mining or construction activities. 5. Discharge type: a. 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 is directed along the eastern edge of the primary mine access road. This combines with surface water originating off the historically mined area. This water flows through a series of catchment ponds that capture any sediment associated with the stormwater. These "ponds" are routinely cleaned out (generally twice a year or as needed) using a front -end loader and backhoe. French drains direct surface water to an engineered ditch on the east side of the access road. Very little sediment is in evidence in water flowing off site at the lower end of the permitted area. As our current plan appears to be working, we will continue to follow what we believe to be BMPs for the site. 2