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Ce <br />tray lc difficull (even with noise abatement) for most <br />receplors along the aligumenls of either the Iteloculed <br />'I'll III or hpgrnded'I'll III n1ternnlive., Most receptors <br />along the existing 'I'll 10 alignment will experience <br />nighttime noise levels in excess of the, Slate standards <br />for the No Iluild Alternative. The "Preliminary Noise <br />Analysis Rcpori'" eonlnins more complete information <br />and is available upon rrgnrsl. <br />CONSTRUCTION <br />Impacts The construction of the proposed action would have it <br />number of impacts associated with it. Must of these <br />impacts would be temporary in mature and would <br />terminate with the completion of the facility. The <br />impacts would be temporary air, noise and water <br />pollution, crosiou during construction, traffic manage- <br />ment during construction including detours and <br />bypasses, mixing plant operations and borrow pit areas <br />outside the right-of-wny. <br />Proposed Mitigation The Mmur staadnrd specifications for Highway Con- <br />-Air, Noise, Water struction provides controls over the contractor's con - <br />Pollution and struction operations. This document can be augmented <br />Erosion Controls by special provisions to the contract to provide <br />additional controls relating to the prevention of air, <br />noise and water pollution and erosion control. <br />Air and noise pollution by construction equipment will <br />be subject to the standards established by the Minnesota <br />Pollution Control Agency, and applicable federal <br />agencies. <br />Water pollution and erosion will be controlled by <br />monitoring the contractor's progress and limiting the <br />amount of surface area of erodible earth exposed by his <br />operations. Examples of these operations are, cleaning <br />out grubbing, excavation, borrow and embankment, <br />grading, paving, and revegetation work. Once the side <br />slopes are shaped, immediate revegetation of lnese <br />slopes will commence by sodding, seeding or ground <br />cover and a mulch placed to limit erosion and thus, <br />water pollution. <br />Some temporary measures may also be used for erosion <br />control such as slope drains, dikes, sediment basins, and <br />temporary quick -growing grasses which will provide <br />temporary cover, but will not compete with permanent <br />grosses later. <br />166 <br />