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• Sites with some amount of previous disturbance, such as wide spots in existing roads and borrow <br />pits, were selected for drilling sites where possible. Pads SS-1, SS-9 and 2010-1 would require <br />new surface disturbance. Pads SS-11 and SS-5 would require partial new disturbance and partial <br />re-disturbance. Pad SS-2 would be entirely in an area that was previously disturbed. Total <br />surface disturbance for drill pads is estimated at 5.4 acres. <br />Access road and drill pad construction would use a D-5 class tractor-dozer or equivalent and a <br />proportionally sized backhoe such as a John Deere 410C where possible. A class D-9 tractor- <br />dozer may be required in some areas. Sedimentation control measures and Best Management <br />Practices (BMPs) such as those described below would be utilized. <br />Temporary roads and drill pads would be designed to minimize erosion and sedimentation. Drill <br />pads are sized to minimize surface disturbance. Drill pads are designed to prevent or diminish <br />overland flow from entering the site during precipitation events. Pad sites would have berms or <br />ditches on all down slope portions and sloped to drain all spills and site precipitation into the <br />mud pits. If necessary, pits would be pumped out to reduce their content and insure that <br />overflow does not occur. If pumped, fluids would be disposed at a Colorado State approved site. <br />In addition, run-off from the outside slope of the berms would be filtered through a sediment <br />control device. <br />Roads or sections of roads that are to be reconditioned offer the best opportunity to reduce <br />sediment load in the basin. Borrow ditches, cross drains, wing ditches and water bars would be <br />used to reduce sediment on new and reconditioned roads. Wing ditches would be directed to <br />straw bale sediment control structures or piles of compacted brush to minimize the chances of <br />sediment reaching the streams. <br />In addition to containment by straw bales or compacted brush piles, run-off from new and <br />reconditioned roads must flow through expanses of heavy vegetation before it reaches a stream. <br />The vegetation would further filter sediment that may by-pass the sediment control structures. <br />This further reduces the chances that any sediment would reach a stream. Sediment control <br />devices (BMPs) to be used on the roads and drill sites would include any of the following: silt <br />fence, straw bales, brush, extensive roughening and waddles. <br />Topsoil stockpiles would be located to minimize soil contamination or loss and no closer than <br />100 lineal feet from live water. A sediment control device would be used to control any runoff <br />from the stockpiles. Soil from mud pits would be stockpiled for use during reclamation. Rock <br />material would be stockpiled separately. No soil generated from excavation, or other operations, <br />would be deposited within 100 linear feet of any drainage with flowing water. <br />Impermeable ground cloths would be used under the drill rigs and petroleum product containers <br />to contain petroleum spills. While working in or adjacent to water, an oil absorbing boom would <br />be placed across the channel downstream of the drill rigs or any other heavy equipment to <br />capture any oil or hydraulic fluid leak. All spills would be contained, cleaned up and reported to <br />the agency representative. <br />After each construction activity (drill site, road segment, etc.) is complete, an initial site <br />inspection would be conducted to verify that all BMPs have been implemented in the field, that <br />DOI-BLM-CO-S050-2010- 0017 EA Page 6 of 43 May 2010