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DURAY SILVER MINES <br /> The SIDS sheets for these chemicals are available in a central location on site. These chemicals <br /> will be stored in factory containers of no greater than 1 ton each. <br /> Sediment and Erosion Control <br /> Areas exposed to sediment or potential for erosion will require control measures that will be <br /> defined during the maintenance/construction planning phase of each project at the site. <br /> Currently a course aggregate berm borders the mine site and Sneffels Creek. The berm is used <br /> to intercept and divert runoff from areas where the stormwater might cause erosion and/or <br /> interfere with the establishment of vegetation. The berm also protects the embankment below. <br /> Sediment control measures located around the site have a sediment barrier consisting of a row <br /> of entrenched and anchored erosion bales (or wattles). Erosion bales hold up to the extreme <br /> winter conditions at the mine site. Life of the bales is approximately one year by the industry <br /> standard. Bales may be replaced sooner if the control provides inefficient support or does not <br /> intercept, slow or detain the flow of stormwater to allow sediment to settle and be trapped. <br /> All erosion bales are either wire-bound or string-tied, and will be installed so that bindings are <br /> oriented around the sides rather than along the tops and bottoms of the bales, to prevent <br /> deterioration of erosion bale bindings. In order to prevent water from escaping between the <br /> bales, the area will be filled with straw, therefore obtaining tight joints. Loose straw is scattered <br /> over the area immediately uphill from an erosion bale barrier to increase barrier efficiency. <br /> Inspections of bales is conducted during SWMP inspections. Repairs are made promptly, as <br /> needed. Erosion/Sediment accumulation against the erosion bale barrier will be removed when <br /> it reaches half the exposed bale height. Erosion bales as an industry standard have an expected <br /> life of one year therefore will be replaced at a minimum of once each year. <br /> Stormwater controls are noted on the SWMP Map. Erosion wattles are installed to <br /> manufacturer's specifications and replaced as needed. Controls are inspected during SWMP <br /> inspections and deficiencies noted and corrected as soon as practically possible. <br /> Preventive Maintenance <br /> Inspection and maintenance practices are as follows: <br /> • Spring and Fall site inspections are conducted to evaluate that the sediment control <br /> structures are functioning correctly. This includes ditches, ponds and culverts. <br /> a Sediment ponds are dewatered within 72 hours after a storm event to maintain pond <br /> capacity. <br /> • The emergency spillways at each pond are checked for erosion or sediment buildup. <br /> Stormwater Management Plan 10 1 P a g e <br />