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APPENDIX A PRELIMINARY STORMWATER MANAGEMENT PLAN 1.0 SITE DESCRIPTION 1.1 Piceance Site The Piceance Site is located within the BLM White River Resource Area and is contained within T1S, R97W, Sections 15, 16, 17, 18, 19, 20, 21, 22, 28, and 29, 6th Principal Meridian (PM), Rio Blanco County, Colorado. 1.2 Parachute Site The Parachute Site will be located on private property in the Parachute Creek valley, in T65, R96W, Sections 34 and 35, 6th PM and T7S, R96W, Sections 2 and 3, 6th PM, Garfield County, Colorado. 1.3 Receiving Waters 1.3.1 Piceance Site The Piceance Site is located within the Piceance Creek watershed, which discharges into the White River. Within the solution mining well field discharge of stormwater will occur through numerous intermittent channels into Piceance Creek (Figure E-3). These channels generally carry water only after precipitation events and during snowmelt, although water may remain in some sections for several days, stormwater runoff from the initial processing area will be routed to a stormwater retention pond. This pond is designed to hold the 24-hour 100-year storm event plus 50 percent plus the capacity of the largest tank onsite plus 1 foot of freeboard. The stormwater flow paths for the processing area of the Piceance Site are illustrated in Figure E-1. Solids will be allowed to settle in the retention pond and decant water will be discharged into intermittent channels where it could eventually enter Piceance Creek. 1.3.2 Parachute Site The Parachute Site is located in the Parachute Creek watershed, which discharges into the Colorado River. stormwater will be collected in an existing network of drainage ditches and stormwater sewer lines that serve the site. stormwater from process areas will be routed to a stormwater retention pond; stormwater from non-process areas will be routed directly to Parachute Creek. Figure E-2 represents a division of the site into drainage Zones and outfalls. Zone D-1 contains two evaporation ponds for process Preliminary Response Plan A-1 Yankee Gulch Sndium Minerals Project American Soda, L.L.P.