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 45 of 66 November 2018 • 41 FEATURE ENVIRONMENTAL AWARDS CENTRAL REGION THIRD PLACE MARTIN MARIETTA CELINA READY MIX PLANT • CELINA, TEXAS An entrance rich in water-wise vegetation is the most prominent indicator of Martin Marietta's commitment to being a good neighbor to the City of Celina and surrounding communities. That commitment carries past the gate with main- tenance routines that include twice weekly rotary sweeper and sweeper vacuum truck passes to help control dust emissions. A plant supervisor tracks daily housekeeping activities, monthly environmental inspections, dust abatement device maintenance, and quarterly reports. A Corporate Environmental Repre- sentative visits the Celina site at least once a quarter and oversees an internal environmental audit every three years. All records are kept on site so governing agencies can easily check documentation attending permit compliance inspections. Environmental Representatives conduct annual training sessions with all plant personnel and mixer truck drivers. They address water and air quality mea- sures, return concrete management, job site rinsing, truck refueling, and SPCC guidelines. Representatives also engage plant supervisors in annual training for water sampling, including the proper way of collecting, storing, and shipping samples, plus pH meter calibra- tion and chain of custody paperwork. Mixer drivers wash trucks prior to leaving the plant, and are instructed to rinse out on site when possible. During annual training, they are advised to inspect site washout areas prior to rinsing drums and chutes, and check if the closest storm drain is uphill or downhill from the washout area. Mixes returned to the Celina plant are placed in roll off bins, then transferred to Big City Concrete for crushing and recycling as road base. The plant is equipped to recycle water to cut down discharges. Process water breaching a pit system flows into a series of three settling ponds. Settled water is recycled for dust suppression at the adjacent Martin Marietta Celina Rail Terminal. The plant averages 1.5 process water discharges per year, typically during rainy spring months when ponds overflow. Water sam- ples have never been out of compliance. A fence, coupled with generous landscaping and an irrigation system along north- ern, eastern and southern property lines, improve Celina operation views. An anti-idling policy cuts truck and loader emissions.

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