Concrete Products

NOV 2017

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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Page 38 of 63 November 2017 • 37 FEATURE ENVIRONMENTAL AWARDS EASTERN REGION FIRST PLACE AGGREGATE INDUSTRIES – NORTHEAST REGION, INC. WALTHAM READY-MIX CONCRETE FACILITY • WALTHAM, MASSACHUSETTS Stormwater is contained in the sedimentation pond and a companion above ground vessel. An unusually wet spring 2017 saw Waltham RMC deploy a portable storage tank for process water, eliminating the need for offsite disposal. Process water is recycled in equipment wash out and at the lightweight aggregate stockpile, which requires constant moisture. The facility occupies a parcel nestled between Brandeis University and the MBTA Commuter Rail. Plant trucks and staff share a narrow access roadway with the school's parking lot. Pedestrians crossing from the university to the rail line add to the challenges Waltham RMC management and drivers face operating in suburban Boston. Proximity to public areas and residential developments means that the plant must appear in top condition at all times. Aggregate Industries Northeast Region employs a 24-hour hotline service to log community concerns; when a call is received, appropriate safety and/ or environmental staff are notified immediately. Waltham RMC is ISO-14001 certified and operates under a site-spe- cific Environmental Management System organized and managed through Envoy, a computer-based program accessible to all plant per- sonnel. Management is very cognizant of the high public visibility of its ready mixed delivery professionals and their key role in day-to-day pollution prevention. All Aggregate Industries mixer drivers receive initial new hire training along with annual refresher training on job- site and plant wash out procedures, waste concrete management, and spill response. To ensure vehicles are safe and fully operational, all mixer trucks undergo pre-and post-shift vehicle inspections. Waltham garage team members coordinate routine preventive maintenance, services, and repairs either in-house or by contract vendors. Process water from fleet and plant functions is contained on-site in a concrete lined washout facility, equipped with a heating system to ensure to year-round recycling in mix production or truck washout. A 10,000-gal. stand-by tank manages excess water during large rain events. Stormwater is discharged from the site under an EPA NPDES Multi-Sector General Permit. The Waltham RMC facility maintains two sedimentation basins to increase settling time prior to discharge. Water stored in the primary sedimentation pond can be pumped into a above ground vessel and reused as needed. The enclosed plant has four silos, each equipped with bin indicators, warning horns, and auto shut-off valves in case of overload. Cement unloading is accompanied by bag- houses, while a central dust col- lector operates during concrete production. The plant manager or batch operator conducts daily air emission checks.

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