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Conditions of Use <br /> The construction sequence schedule is an orderly listing of all major land-disturbing activities <br /> together with the necessary erosion and sedimentation control measures planned for the project. <br /> This type of schedule guides the contractor on work to be done before other work is started so that <br /> serious erosion and sedimentation problems can be avoided. <br /> Following a specified work schedule that coordinates the timing of land-disturbing activities and the <br /> installation of control measures is perhaps the most cost-effective way of controlling erosion during <br /> construction.The removal of ground cover leaves a site vulnerable to erosion.Construction sequen- <br /> cing that limits land clearing, provides timely installation of erosion and sedimentation controls,and <br /> restores protective cover quickly can significantly reduce the erosion potential of a site. <br /> Design Considerations <br /> . Minimize construction during rainy periods. <br /> • Schedule projects to disturb only small portions of the site at any one time. Complete grading <br /> as soon as possible. Immediately stabilize the disturbed portion before grading the next por- <br /> tion. Practice staged seeding in order to revegetate cut and fill slopes as the work progresses. <br /> 11-3.3 Construction Runoff BMPs <br /> BMP C200: Interceptor Dike and Swale <br /> Purpose <br /> Provide a dike of compacted soil or a swale at the top or base of a disturbed slope or along the peri- <br /> meter of a disturbed construction area to convey stormwater. Use the dike and/or swale to intercept <br /> the runoff from unprotected areas and direct it to areas where erosion can be controlled.This can <br /> prevent storm runoff from entering the work area or sediment-laden runoff from leaving the con- <br /> struction site. <br /> Conditions of Use <br /> Use an interceptor dike or swale where runoff from an exposed site or disturbed slope must be con- <br /> veyed to an erosion control BMP which can safely convey the stormwater. <br /> • Locate upslope of a construction site to prevent runoff from entering the disturbed area. <br /> • When placed horizontally across a disturbed slope, it reduces the amount and velocity of run- <br /> off flowing down the slope. <br /> . Locate downslope to collect runoff from a disturbed area and direct it to a sediment BMP(e.g. <br /> BMP C240:Sediment Trap or BMP C241: Sediment Pond(Temporary)). <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume it-Chapter 3-Page 329 <br />