T0777 Attachment 5 - Spreading Services Guide.pdf

This document comprises the Solid Chemical Application Guidelines for an Effective Anti-icing Program issued by the New Jersey Department of Transportation (NJDOT). The guidelines were adapted from the Manual of Practice for an Effective Anti-Icing Program prepared by the Federal Highway Administration (FHWA), US Army Cold Regions Research and Engineering Laboratory, and the Corps of Engineers in 1996. The document serves as a technical reference for the Winter Maintenance Program operated by NJDOT.

The guidelines establish operational procedures for applying solid chemical de-icers across five distinct 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 document specifies chemical application rates measured in pounds per lane-mile, maintenance actions, and pavement treatment protocols based on temperature ranges. Application rates vary significantly by conditions, ranging from 150 to 400 pounds per lane-mile depending on weather severity and pavement temperature. The guidelines recommend pre-wetted solid chemicals as the primary treatment method and establish differentiated protocols for initial operations versus subsequent maintenance applications. Critical guidance includes timing recommendations, such as applying chemicals 1-2 hours in advance of freezing conditions, and conditional instructions to increase or decrease application rates based on precipitation intensity and pavement temperature fluctuations. The document emphasizes that chemical applications below 15°F are not recommended, and abrasives should be applied instead to enhance traction.