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ATTACHMENT E <br /> <br /> Public Works Maintenance Division <br /> Guidelines for Anti-icing/Deicing <br /> <br />Introduction <br /> <br />Public Works Maintenance Division (PWM) has established guidelines for the use of <br />anti-icing and deicing agents as a tool to combat winter storms. The information <br />contained herein is intended as a basic guideline only. This in no way constitutes a <br />systematic process or procedure for the use of anti-icing/deicing materials, chemicals, or <br />equipment. The successful use of anti-icing and deicing agents is a learning process <br />through which knowledge, training and experience are gained. The use of anti-icing and <br />deicing agents can be a very beneficial tool when used in conjunction with other best <br />practices and methods for snow and ice control. <br /> <br />PWM Anti-Icing/Deicing Guidelines <br /> <br />1. Guidance for Anti-Icing/Deicing Operations <br /> <br />Guidance for anti-icing/deicing operations is presented in Tables 1-6 for six distinctive <br />winter weather events. The six events are: <br /> <br />1. Light Snow Storm <br />2. Light Snow Storm with Period(s) of Moderate or Heavy Snow <br />3. Moderate or Heavy Snow Storm <br />4. Frost or Black Ice <br />5. Freezing Rain Storm <br />6. Sleet Storm <br /> <br />The tables suggest the appropriate maintenance action to take during an initial or <br />subsequent (follow-up) anti-icing/deicing operation for a given precipitation or icing <br />event. Each action is defined for a range of pavement temperatures and an associated <br />temperature trend. Application rates are suggested rates and should be adjusted if <br />necessary to achieve effectiveness or efficiency, for local conditions. Comments and <br />notes are given in each table where appropriate to further guide maintenance field <br />personnel in their anti-icing/deicing operations. Included in the following charts are <br />recommendations for the use of pre-wet aggregate. <br /> <br />2. Glossary of Terms: <br /> <br />Anti-Icing: The application of liquid chemicals to prevent the formation of frost or the <br />bonding of snow or ice to pavement. Initial application can be made either as a <br />pretreatment in advance of freezing conditions and/or storm events. <br /> <br /> <br />