T0777 Attachment 5 - Spreading Services Guide.pdf

This document is the Solid Chemical Application Guidelines for an Effective Anti-icing Program developed 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 prepared by the Federal Highway Administration (FHWA) and the US Army Cold Regions Research and Engineering Laboratory, Corps of Engineers in 1996.

The document provides operational guidance for the application of solid chemical de-icing agents across various weather conditions and pavement temperatures. It establishes chemical application rates measured in pounds per lane-mile (lb/lane-mi) and specifies maintenance actions, ranging from no treatment to chemical application at rates between 150 and 400 lb/lane-mi depending on conditions. The guidelines address five distinct weather events: light snow storms with moderate or heavy snow periods, moderate or heavy snow storms, frost or black ice conditions, freezing rain storms, and sleet storms. For each weather event, the document prescribes initial and subsequent operational protocols based on pavement temperature ranges (above 32°F, 32°F, 25-32°F, 15-25°F, and below 15°F), along with corresponding maintenance actions and chemical spread rates. Key operational directives include applying chemicals ahead of traffic rush periods, plowing before chemical applications to remove excess accumulation, monitoring pavement temperature and precipitation closely, and adjusting application rates based on intensity and temperature conditions. The guidelines note that chemical application is not recommended below 15°F, where abrasives are preferred for enhancing traction.