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Erosion and sediment control requires the use of specific BMPs that address different physical conditions than those associated with channel reconstruction. Generally surface sheet flow control practices vary physically from those used to control concentrated surface flows because of the differences in environmental conditions and requirements. Individuals selecting single or combinations of BMPs for use on a site must take into consideration the variety of flow conditions that may occur there. Often there isri t a correct solution, but rather a variety of combinations may accomplish erosion and sediment control objectives for a given location. Typically, complex flows require more sophisticated structures and practices than less complex flows. BMPs have been grouped in the following sections based on their primary use or application. While the use of some of them may be limited to the category in which they are placed, many of them present useful applications in multiple categories. Typical installations for BMPs are provided for clarity. The practice of prescribing routine controls for erosion and sedimentation problems will be avoided. Figures A-I through A-9 have been included to provide additional information and guidance during construction activities. These Figures include a number of construction techniques and generally accepted design criteria, which, when properly employed, can greatly reduce soil erosion caused by stormwater runoff. Once employed, these BMPs will provide long term erosion control for operations as well as short-term erosion control during reclamation. There are a number of good housekeeping techniques included in this section, which will limit or eliminate the possibility of pollution associated with the operation of these facilities, such as raw product, chemicals, waste, petroleum products, sediment, and sewage from entering waters of the State. Implementation of these techniques will provide the most effective control for the situation. 2.1 Erosion and Sediment Controls 2.1.1 Concentrated Flow Structures Concentrated flow structures are used to carry concentrated surface flows around, through, or from undisturbed, disturbed, and reclaimed areas and facilities. Berms (Figure B-1), diversions (Figure B-Zj, and reconstructed channels (Figure B-3) are commonly used concentrated flow structures. Diversions may be placed to prevent the commingling of undisturbed and disturbed runoff and to reduce treatment volumes. Also, undisturbed area runoff may be diverted to reduce the volume that must be routed through concentrated flow structures within reclaimed areas. Diversions may also result in beneficial use of the diverted flow. Concentrated flow structures may be designed for temporary or permanent uses. Soils data should be analyzed, particularly for erodiblity, when developing specifications for concentrated flow structures. Preliminary Response Plan A_rJ Yankee Gulch Sodium Minerals Project American Soda, L.L.P.