Agenda - Council - 09/27/2016 - Laserfiche WebLink

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SECTION 31 25 00 EROSION AND SEDIMENTATION CONTROLS PART 1 - GENERAL 1.01 TEMPORARY CONTROL OF AIR/WATER POLLUTION AND SOIL EROSION/SILTATION A. This item shall consist of temporary control measures as shown on Plans or as ordered by Engineer during construction to control water pollution, soil erosion, and siltation through use of temporary rock construction entrance, berms, dikes, dams, sediment basins, silt fences, gravel, mulches, grasses, slope protection, and other erosion control devices or methods. B. Temporary erosion control measures contained herein shall be coordinated with permanent erosion control measures specified as part of this Contract to extent practical to assure economical, effective, and continuous erosion control throughout Project construction period. C. Temporary control may include Work outside construction limits such as borrow pit operations, equipment and material storage sites, waste areas, and temporary plant sites. 1.02 AUTHORITY OF ENGINEER: A. Engineer has authority to limit surface area of erodible earth material exposed by clearing and grubbing, to limit surface area of erodible earth material exposed by excavation, borrow and fill operations, and to direct Contractor to provide immediate permanent or temporary pollution control measures to minimize contamination of adjacent streams or other watercourses, lakes, ponds, or other areas of water impoundment. 1.03 CONSTRUCTION DETAILS: A. Contractor will be required to incorporate all permanent erosion control features into Project at earliest practicable time as outlined in accepted schedule. B. Except where future construction operations will damage slopes, Contractor shall perform permanent seeding and mulching and other specified slope protection work in stages, as soon as substantial areas of exposed slopes can be made available. C. Temporary erosion and pollution control measures will be used to correct conditions that develop during construction that were not foreseen during the design stage; that are needed prior to installation of permanent control features; or that are needed temporarily to control erosion that develops during normal construction practices, but are not associated with permanent control features on Project. D. Where erosion is likely to be a problem, clearing and grubbing operations should be scheduled and performed so that grading operations and permanent erosion control features can follow immediately thereafter if Project conditions permit; otherwise, temporary erosion control measures may be required between successive construction stages. E. Engineer will limit area of clearing and grubbing, excavation, borrow, and embankment operations in progress, commensurate with Contractor's capability and progress in keeping finish grading, mulching, seeding, and other such permanent control measures current in accordance with accepted schedule. Should seasonal limitations make such coordination unrealistic, temporary erosion control measures shall be taken immediately to extent feasible and justified. F. If temporary erosion and pollution control measures are required due to Contractor's negligence, carelessness, or failure to install permanent controls as a part of Work as scheduled or are ordered by Engineer, such work shall be performed by Contractor at Contractor's own expense. Division 31— Earthwork DV31-6