T0777 Attachment 5 - Spreading Services Guide.pdf

This document is the Solid Chemical Application Guidelines for an Effective Anti-icing Program prepared by the New Jersey Department of Transportation for its Winter Maintenance Program. The guidelines were adapted from the Manual of Practice for an Effective Anti-Icing Program originally developed by the Federal Highway Administration, US Army Cold Regions Research and Engineering Laboratory, and the Corps of Engineers in 1996.

The document provides operational guidance for applying solid chemical de-icers across five weather event scenarios: light snow storms, moderate or heavy snow storms, frost or black ice conditions, freezing rain storms, and sleet storms. For each weather event, the guidelines specify maintenance actions and chemical application rates (measured in pounds per lane-mile) based on pavement temperature ranges, pavement surface conditions, and whether conditions are steady, rising, or falling. Chemical spread rates vary by weather condition and temperature, ranging from no application above 32°F during steady or rising conditions to application rates between 150 and 400 pounds per lane-mile during active snow events. The guidelines distinguish between initial operations and subsequent operations, with higher application rates typically recommended for heavier snow periods and lower temperatures. Specific recommendations address timing of applications relative to traffic patterns, monitoring requirements, and the use of pre-wetted solid chemicals or liquid treatments to enhance effectiveness.