Concrete Products

NOV 2018

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 43 of 66 November 2018 • 39 FEATURE ENVIRONMENTAL AWARDS CENTRAL REGION FIRST PLACE CEMSTONE PRODUCTS CO. CEMSTONE – MINNEAPOLIS • MINNEAPOLIS, MINNESOTA The site is part of an industrial area along the Mississippi River in north Minneapolis. Cem- stone erected a decorative precast concrete perimeter wall to mitigate noise and shield a neighboring condominium development from view of the operation. An enclosed weir system handles process water year-round. In addition to washing mixer drums, recycled water from the system is also used in batching of fresh concrete. Quality control measures in the recycling loop include testing of gray water samples in hydrometers. Another source for truck washing and concrete batching is new: A 190,000-gallon stormwater harvesting system installed under- neath aggregate stockpiles. Cemstone partnered with the Mississippi Watershed Management Organization to devise a system capable of impounding all site runoff equivalent to a 10-year, 24-hour storm event. The harvest- ing plan makes it possible for the producer to temper the warmer weir water with up to 1.8 million gallons per year of cooler water. Cemstone – Minneapolis water consumption, energy and fuel use, plus other environmental metrics are tracked electronically. Employees are trained to measure and record such num- bers, alongside annual instruction on SWPPP contents, proper fueling technique and spill response procedures. All silos have baghouses and the enclosed plant is equipped with a fugi- tive dust collector. Each day the plant operates, a visible check is performed on seven possi- ble emission sources; corrective action follows observance of any breaches. A majority of the site is paved to minimize dusting and tracking. Paved areas are swept three times a week. Cemstone operates the plant with the same good neighbor mind set as its other, less urban sites. A recently installed, 190,000-gal. runoff storage system will supply cool water to lower the tem- perature of recycled water contained in the main plant weir. The Minneapolis plant currently uses recycled water for 30 percent of batching requirements. Team members use hydrometers for gray water sample testing. Cemstone mixer trucks' on-board washout systems allow all water to be pumped back to the drum while filtering out sand and rock. Trucks are also equipped with spill kits for which drivers are trained; as a result, Cemstone can dispatch loads to environmentally sensitive areas such at the St. Anthony Falls Lock and Dam.

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