Lafarge North America Inc., one of the largest suppliers of construction materials in the United States and Canada, and four of its U.S. subsidiaries have agreed to resolve alleged Clean Water Act violations. The violations include unpermitted discharges of stormwater and failure to comply with stormwater permits at 21 stone, gravel, sand, asphalt and ready-mix concrete facilities in Alabama, Colorado, Georgia, Maryland and New York.Stormwater flowing over concrete manufacturing facilities can carry debris, sediment and pollutants including pesticides, petroleum products, chemicals and solvents, which can have a significant impact on water quality. Lafarge will implement a nationwide evaluat...