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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Conditions ot Use � <br /> Erosian control work should never be"incidental"to the contract as it is extremely difficult for the <br /> contractor te bid the work. Work that i;incidental to the contract is work wherc no separate mcasurement <br /> or payment is made. The cost for incidental work is included in payments made for applicable bid itcros <br /> in the schedule of unit prices. For example,any crosion canvol work associatcd with an item called <br /> "clearing and gubbing"is bid and paid Cor as part of that item,not separately. <br /> Effectivc means for payment of erosion control work inctude: <br /> • Tempotary erosion aod sediment conhol lump sum <br /> • Temporary ESC forcc account <br /> • Unil priccs <br /> • Lump sum. <br /> 3.2,23 BMP C162: Scheduling <br /> Purpose <br /> Sequencing a construction project reduces the amount and duration of soil cxposed to erosion by wind, <br /> rain,runoff,and vehicle tracking. <br /> Co�;fitiOnS of Use <br /> The conshuction sequence schcdule is an orderly listing of all major land-disturbing activities together <br /> with the necessary erosion and sedimentation control measures planned for the project. This type of <br /> schedule guides the conRactor on work to be done before other work is started so that serious crosion and <br /> sedimentation problems can be avoided. <br /> Following a spccificd work schedule that coordinates the timing of land-disturbing ac(iviUcs and thc � <br /> installation of control measures i,perhaps the most cost-effectivc way of control�ing erosion during <br /> consevction. The removal of surface ground covet leaves a site wluerable to accelerated erosion. <br /> Construction procedures that limit land cleanng,provide timely installation of erosion and scdimentation <br /> controls,and restore protective cover quickly can significantly reduce the erosion potential of a site. <br /> Design Considerafions <br /> • Avoid rainy periods <br /> • Schedule projecLs to disturb only small portions of t6e site at any one time. Completc grading as <br /> soon as possiblc. Immcdiatcly stabilize thc dismrbed portion beforc grading the next ponion. <br /> Practicc staged secding in order[o revegetate cut and fill slapes as the work progresses. <br /> 3.3 Runoff Conveyance and Treatment Best Management Practices <br /> 3.3.1 BMP C200: Interceptor Dike and Swale <br /> Purpose <br /> Provide a ridge of compacted soil,or a ridge with an upslope swale,at the top or base of a dishubeci slope <br /> or along lhe perimeter of a dishubed conswction arca to convey stormwater. Use the dike ard/or swale <br /> to inrercept the[unoff from uuprotected areas an3 direct it to areas where erosion can ba conVolled. This <br /> can prevent stortn runoff&om cntering the work arca or sediment-ladcn cunoff(rom leaving the <br /> conshuction site. <br /> Volume II—Construction Stormwater Pollution Prevention <br /> 3•35 <br />