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• 2.1.4 Biotechnical Stabilization Measures When reconstructing channels it may be possible to incorporate biotechnical stabilization measures to provide for erosion stability. Biotechnical stabilization measures involve the use of selective vegetation plantings to protect the channel from erosion and to maintain alignment and grade. Herbaceous rhizomatous species are normally used through out the channel profile. Woody species may be planted in the secondary floodplain to control channel cross-sectional profiles and gradient. It may be necessary to provide suitable substrates in the pilot channel so that the stream channel is capable of naturally self armoring. Methodologies for evaluating a channel's ability to self armor based on particle size are available. When excessive channel erosion occurs these methodologies may be used to evaluate self-armoring capabilities. Based on such analyses, additional larger substrate particles may be added to a streambed to promote self-armoring. Various biotechnical engineering methods and practices that may be used to accomplish erosion and sediment control in reconstructed channels include live cuttings, fascines (wattles), brush layering, vegetated dikes, live cribwalls, and tree revetments. These techniques may be used individually or in combination depending on site needs and requirements. Site specific plans using biotechnical stabilization measures will be prepared as appropriate sites are encountered during project development. 2.2 Materials Handling and Spill Prevention The following is a list of good housekeeping practices that may be applicable for the storage and handling of materials during operation activities: • Refuse dumpsters shall be equipped with lids to prevent precipitation from entering, and the areas around the dumpsters wil! be kept clean, All hazardous chemicals will be stored indoors (with the exception of gasoline and diesel fuel), • Loading and unloading areas will be covered, have bag houses, and concrete floors, Employees will be trained in spill prevention and response techniques to reduce the possibility of spills entering stormwater, • Storage containers, drums, and bags shall be stored away from direct traffic routes to prevent accidental spills, Aisle ways will be adequately sized to allow unobstructed movement of people, equipment, and materials, • Empty drums shall be covered to prevent collection of precipitation, • When possible drums and totes will be returned to the manufacturer for recycling, • Containers shall be stored on pallets or similar devices to prevent corrosion of the containers, Prel~mmarv Response Plan A-14 Yankee Gulch Sodium Minerals Project Amencan Soda. L.L.P.