CPWR’s Model Silica Specifications for Masonry Grinding, Cutting, and Sawing are a product of the CPWR/NIOSH Engineering Controls Work Group. They were developed by a panel of researchers, contractors, labor organizations and government representatives with substantive experience and knowledge in masonry work and/or engineering controls for silica.  While these specifications were designed primarily for protecting workers from occupational exposure to silica, they also provide guidance to those charged with protecting the environment and public from elevated dust levels.  The language contained in the specifications can be used in whole, or in part, by regulators, project managers, building owners and others seeking to reduce dust generated from construction activities.  For example, the Philadelphia School District used these specifications in creating contractor requirements that have been in force for all capital improvement projects since February of 2014.