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G. Engineer may increase or decrease area of erodible earth material to be exposed at one time as determined by <br />analysis of Project conditions. <br />H. Erosion control features installed by Contractor shall be acceptably maintained by Contractor during con- <br />struction period. <br />I. Whenever construction equipment must cross watercourses at frequent intervals, and such crossings will <br />adversely affect the sediment levels, temporary structures should be provided. <br />J. Pollutants such as fuels, lubricants, bitumen, raw sewage, wash water from concrete mixing operations, and <br />other harmful materials shall not be discharged into or near rivers, streams, wetlands and impoundments or into <br />natural or manmade channels leading thereto. <br />1.04 SCHEDULE: <br />A. Prior to start of construction, Contractor shall submit schedules for accomplishment of temporary and <br />permanent erosion control work. <br />B. Contractor shall also submit a proposed method of erosion and dust control on haul roads and borrow pits and a <br />plan for disposal of waste materials. <br />C. Work shall not be started until erosion control schedules and methods of operations for applicable construction <br />have been accepted by Engineer. <br />PART 2- PRODUCTS <br />2.01 MATERIALS: <br />A. Erosion control items are shown on Plans. <br />B. Erosion control materials shall meet requirements of MN/DOT Standard Specifications. <br />C. All other materials shall meet commercial grade standards and shall be approved by Engineer before being <br />incorporated into Project. <br />D. If Contractor operations disturb more than one acre, Contractor shall obtain and pay fees to obtain NPDES <br />Construction Permit from Minnesota Pollution Control Agency. <br />PART 3 - EXECUTION <br />3.01 SPECIFIC CONCERNS <br />A. WATER QUALITY <br />1. Erosion control measures shall be maintained to prevent -sediment pollution of adjacent water courses. <br />2. Build, maintain, and operate dams, channels, flumes, sumps and other temporary diversion and protective <br />works to divert stream flow and other surface water through or around construction site and away from <br />Work while construction is in progress. <br />3. Unless otherwise specified, a diversion must discharge into same natural drainageway in which its head <br />waters are located. <br />4. Additional detailed provisions for specific types of construction, such as well construction, may be <br />included elsewhere in these specifications. <br />Division 31— Earthwork <br />DV31-7 <br />