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 (NJDOT) Winter Maintenance Program. The guidelines are based on materials adapted from the Manual of Practice for an Effective Anti-Icing Program originally developed by the Federal Highway Administration (FHWA) and the U.S. Army Cold Regions Research and Engineering Laboratory, Corps of Engineers in 1996.

The document provides operational guidance for the application of solid chemical de-icers across five distinct weather conditions: light snow storms with moderate to heavy snow periods, moderate or heavy snow storms, frost or black ice conditions, freezing rain storms, and sleet storms. For each weather event, the guidelines specify pavement temperature ranges, maintenance actions, chemical spread rates measured in pounds per lane-mile, and application timing for both initial and subsequent operations. Chemical spread rates vary considerably based on temperature and weather intensity, ranging from 150 to 350 pounds per lane-mile for snow conditions and 150 to 250 pounds per lane-mile for frost and freezing rain events. The guidelines emphasize pre-wetting solid chemical applications, proactive chemical treatment ahead of traffic rush periods, plowing requirements to remove excess snow and ice before treatment, and continuous monitoring of pavement temperature and precipitation to determine appropriate reapplication frequencies and rate adjustments. Applications are not recommended below 15°F, with abrasives recommended as an alternative in extremely cold conditions.