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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL 3.3 Conditions of Use Erosion control work should never be "incidental" to the contract as it is extremely difficult for the contractor to bid the work. Work that is incidental to the contract is work where no separate measurement or payment is made. The cost for incidental work is included in payments made for applicable bid items in the schedule of unit prices. For example, any erosion control work associated with an item called "clearing and grubbing" is bid and paid for as part of that item, not separately. Effective means for payment of erosion control work include: • Temporary erosion and sediment control lump sum • Temporary ESC force account • Unit prices • Lump sum. 3.2.23 BMP C162: Scheduling Purpose Sequencing a construction project reduces the amount and duration of soil exposed to erosion by wind, rain, runoff, and vehicle tracking. Conditions of Use The construction sequence schedule is an orderly listing of all major land -disturbing activities together with the necessary erosion and sedimentation control measures planned for the project. This type of schedule guides the contractor on work to be done before other work is started so that serious erosion and sedimentation problems can be avoided. Following a specified work schedule that coordinates the timing of land -disturbing activities and the installation of control measures is perhaps the most cost-effective way of controlling erosion during construction. The removal of surface ground cover leaves a site vulnerable to accelerated erosion. Construction procedures that limit land clearing, provide timely installation of erosion and sedimentation controls, and restore protective cover quickly can significantly reduce the erosion potential, of a site. Design Considerations • Avoid rainy periods • Schedule projects to disturb only small portions of the site at any one time. Complete grading as soon as possible. hnmediately stabilize the disturbed portion before grading the next portion. Practice staged seeding in order to revegetate cut and fill slopes as the work progresses. Runoff Conveyance and Treatment Best Management Practices 3.3.1 BMP C200: Interceptor Dike and Swale. Purpose Provide a ridge of compacted soil, or a ridge with an upslope Swale, at the top or base of a disturbed slope or along the perimeter of a disturbed construction area to convey stormwater. Use the dike and/or swale to intercept the runoff from unprotected areas and direct it to areas where erosion can be controlled. This can prevent storm runoff from entering the work area or sediment -laden runoff from leaving the construction site. Volume 11— Construction Stormwater Pollution Prevention 3-35