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

The guidelines establish operational protocols for solid chemical application during winter weather events across five distinct weather 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 document specifies pavement temperature ranges, initial operation procedures, subsequent maintenance actions, and recommended chemical spread rates measured in pounds per lane-mile. Chemical application rates vary significantly based on temperature conditions, ranging from 150 to 400 lb/lane-mi depending on the weather event and pavement conditions. Operational guidance includes pre-wetted solid chemicals, liquid or pre-wetted solid applications, and abrasive treatments for temperatures below 15°F where chemical application is not recommended. The guidelines emphasize timing of applications to prevent deteriorating conditions, requirements to plow before chemical application to remove excess snow or ice, and monitoring protocols for pavement temperature and precipitation intensity to determine adjustment of application frequency and rates.