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i • <br />escaping the enclosures. Once outside the enclosures product could come in contact <br />with stormwater prior to being cleaned up. <br />There will be landscape irrigation at the Parachute Site but none is anticipated for the <br />Piceance Site. Overland flow from landscape irrigation will be contained within the <br />process area and routed to the stormwater retention pond. Sediment accumulated by <br />this water will settle out in the stormwater retention pond and will not enter State <br />waters. <br />1.5 Location and Description of Possible Pollution Sources <br />1.5.1 Sediment <br />Stormwater from the process areas of both the Piceance and Parachute Sites will be held <br />in stormwater retention ponds, solids will precipitate out, and release from these ponds <br />will not contribute sediment to waters of the State. Stormwater from the well field and <br />access roads at the Piceance Site and the non-process areas of the Parachute Site will not <br />be retained and therefore, if not properly controlled, could contribute sediment to <br />waters of the State. BMPs used to control sediment are discussed in detail in section 2.0. <br />Within the well field area of the Piceance Site stormwater will be routed around the <br />well pads to prevent erosion of these disturbed areas. Stormwater routed through the <br />well field will be discharged through numerous intermittent channels as shown in <br />Figure E-3. Stormwater landing on the well pad wilt be diverted through a BMP to <br />remove accumulated sediment prior to discharge into a natural drainage. Drilling <br />water and groundwater brought to the surface as a result of drilling operations will be <br />directed to a pit on the well pad. Water collected in this pit will be recycled as a part of <br />the drilling process and therefore will not come in contact with stormwater. Soil <br />removed for the construction of the well pad will be stockpiled on the pad. Sediment <br />entering stormwater from these stockpiles will also be retained on the pad. <br />Temporary roads constructed to access the well field at the Piceance Site will be <br />designed to allow stormwater to pass through the site to numerous intermittent <br />channels and ultimately to Piceance Creek. Stormwater routed through ditches serving <br />access roads will pass through BMPs designed to capture sediment and slow overland <br />flow. Allowing stormwater to disperse naturally throughout the site reduces the <br />potential for severe erosion to occur. Dispersion of stormwater over a 160-acre mine <br />panel creates numerous outfalls. The area around the mine panel will be monitored to <br />determine the effectiveness of the BMPs and to identify negative impacts resulting from <br />stormwater runoff. Impacts attributed to activities within the mine panel will be <br />mitigated through implementation of BMPs. <br />1.5.2 Hazardous Chemicals <br />Preliminary Response Plan A-3 <br />Yankee Gulch Sodium Minerals Project <br />Amencan Such, L.L.P. <br />