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). The guidelines are adapted from the Manual of Practice for an Effective Anti-icing Program originally developed by the Federal Highway Administration (FHWA), the US Army Cold Regions Research and Engineering Laboratory, and the Corps of Engineers in 1996. The document serves as the technical standard for the NJDOT Winter Maintenance Program.

The document provides operational guidelines for the application of solid de-icing chemicals across five distinct weather conditions: 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 chemical spread rates measured in pounds per lane-mile, maintenance actions, and application protocols based on pavement temperature ranges and trends. Chemical spread rates vary by condition, ranging from 150 to 400 pounds per lane-mile depending on temperature and precipitation intensity. The guidance emphasizes preventive chemical application ahead of traffic rush periods, pre-wetting of solid chemicals, and continued application during storm events. Key operational principles include timing initial applications to prevent deteriorating conditions, increasing application rates during heavier precipitation periods, and adjusting spread rates based on pavement temperature changes and moisture presence. The guidelines note that chemical applications below 15°F are not recommended, with abrasives suggested as an alternative for enhanced traction in those conditions.