2012-07-25 CC Packet - Laserfiche WebLink

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During the Storm USING ABRASIVES »R Use winter sand and other abrasives when temperatures are Winter abrasives too cold for deicing chemicals to be effective. But be aware that use has been sand does not melt anything. It provides temporary traction, documented as and only when it is on top. Sand also clogs sewers, ditches, and an air pollution streams. As a result, avoid sand use as much as possible. concern. A salt /sand mix is generally not recommended. Salt reduces the effectiveness of sand, and sand reduces the effectiveness of salt. However, a salt /sand mix may be helpful in limited situations such as a long freezing rain event where the salt is washed away quickly. A 25 to 50 percent sand /salt mix has been documented as effective in increasing friction by stick- ing the sand to the surface, like sandpaper. • Use abrasives in slow - moving traffic areas such as inter- sections and curves. • If your purpose is melting, use salt only. I you LSO a 50/50 • Salt is ineffective in cold weather, so use sand or an alter - salt /sand mix, native chemical. you're generally • Sand is not cheap when you consider the handling, clean - either half right or up, and disposal costs. half wrcng. Using a • Sweep up sand frequently, after each event if feasible. salt /sand mix leaas la overapplication ct both materials, STANDARD PRACTICES • Know the pavement temperatures and trends to help you use the right application at the right time. Generally use less chemical when temperatures are rising and more when they are falling. • Don't apply dry salt (sodium chloride) at below 20° F pave- ment temperature. It will not melt fast enough to help and it will blow off the road into the ditch. • Below 20° F, switch to other tools like CaCl and MgCl at curves, hills, and intersections to obtain maximum melt- ing. If unavailable, use sand for traction. neas • Adjust your spinner speed to the lowest setting possible, Sand that washes except at intersections. into a stream • Drive at the slowest possible speed -17 to 25 mph— slight- or lake may ly higher if prewetting. smother some • Don't let the traffic dictate your speed. Keep it slow to keep small aquatic material on the road. organisms. • Apply deicers in the center of the road or high side of the curve. 10 61