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 are adapted from the Manual of Practice for an Effective Anti-Icing Program originally developed by the Federal Highway Administration (FHWA) in collaboration with the US Army Cold Regions Research and Engineering Laboratory, Corps of Engineers in 1996.

The document provides operational guidance for applying solid chemical de-icing agents 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 spread rates (measured in lb/lane-mi) based on pavement temperature ranges and trends. Chemical spread rates vary significantly by conditions, ranging from no application above 32°F with rising temperatures to rates between 150-350 lb/lane-mi for temperatures between 15-32°F. The guidelines emphasize timing of initial and subsequent applications to prevent ice formation and packed snow development, recommend plowing before chemical application to remove excess snow and slush, and note that chemical application is not recommended below 15°F, where abrasives are preferred. The guidance includes specific instructions for monitoring pavement temperature and precipitation, adjusting application rates based on traffic volume and condensation levels, and applying chemicals ahead of traffic rush periods during storms.