07/09/2012 Council Packet - Laserfiche WebLink

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• • Anti-icing has many advantages. • Anti -icing returns road surfaces to normal faster, resulting in fewer accidents and delays. • Anti -icing can reduce airborne dust and salt particulates. • Salt needs moisture to be effective. Applying brine jumpstarts the melting process. • Brine sticks to the road surface. Tt will not be as easily blown off the road by wind or traffic, so material is more efficiently used. • If the storm is delayed, salt residue remains on the road ready to begin work when precipitation begins. • Crews can begin treatment in advance of a storm. Because anti -icing prevents the bonding of snow and ice to pavement, snowfighters have less work to maintain safe roadways as the storm progresses. • Increased efficiency results in use of less deicer and manpower, therefore lowering the cost of maintaining safe road conditions. The use of less deicing materials also minimizes environmental concerns. *Snowfighters Handbook" Published by the Salt Institute, Alexandria Virginia "Anti -icing is often the most cost - effective and environmentally safe practice in certain winter road maintenance situations." *MNDOT Field Handbook for Snowplow Operators Deicing. The Field Handbook for Snowplow Operators has guidelines for applying salt to roads in a manner that maintains the goal of safe roads while also being sensitive to the environment. The Salt Institute "Snowfighters Handbook" suggests application rates of 200 -800 lbs per two -lane mile. Salt requirement estimate. Spreading rates differ based on types of storm, weather conditions and operational procedures. Application rates generally range from 300 to 800 lb per two -lane mile. "Snowfighters Handbook" Published by the Salt Institute, Alexandria, Virginia Rate of Application Coverage Per Cu. Yd. of Per Two -Lane Mile Salt Per Two -Lane Mile 800 Ibs 2 1/2 700 Ibs 2 3/4 600 Ibs 3 500 Ibs 4 400 Ibs 5 300 lbs 6 200 Ibs 10 Our grant application anticipates that the average rate of application of salt when changing from sand /salt mix is approximately 500 lbs per double lane mile and could be much higher if not managed. A report from DuPage River Salt Creek Workgroup dated August 16, 2007, indicated average salt application rates of up to 1,300 lbs per lane -mile for one group of its cities. That study estimated that anti - icing practices alone could reduce salt use by 24 %. A follow up report after implementing anti -icing and other measures showed 2010 application rates of 330 -470 pounds per lane mile. Not all of the cities implemented anti -icing and other measures. P41