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 49 of 63

48 • November 2017 FEATURE ENVIRONMENTAL AWARDS WESTERN REGION FIRST PLACE CALPORTLAND CO. DUWAMISH READY MIX PLANT • SEATTLE, WASHINGTON Sustainability is a way of business for the high-profile Duwamish facil- ity, located on a key thoroughfare into downtown Seattle. Proximity to the Puget Sound enables material delivery by barge, typically 75 percent more fuel efficient than trucking. Advanced recycling meth- ods for returned concrete and truck washout net up to 6,000 tons of recovered aggregates monthly. Site air quality and water management systems are based on a series of best practices, which are continually updated to reflect changes in operations and environmental compliance. A CalPortland Environmental Manager provides annual training to all employees, stressing critical aspects of the producer's water, air and solid waste programs. Water management at the Duwamish plant emphasizes recycling back into concrete mixes, along with recovering valuable sand & gravel from returned material. Augmenting resource recovery is the recent addition of an advanced filter press, which extracts clarified, batch-grade water from process flows. Major storm events aside, plant staff is able to recycle 100 percent of process water through much of the year. Beyond duties surrounding the fleet and general house- keeping at the plant, mixer truck drivers abide strict jobsite washout standards. All trucks have chute-mounted vessels for use on sites that do not have appropriate washout areas. Environmental compliance, site limitations and CalPortland operating philosophy drive exhaustive recycling measures at the Duwamish plant. A concrete recovery system cleans and reclaims aggregates from 85 percent of returned material loads, the remaining volume placed in eco block forms or hardened for off-site recycling. Recovery system and other process water is settled ahead of pumping to a filter press, capping a recycling loop. Mindful of the plant's high visibility among Seattle commuters and residents, CalPortland ensures overall upkeep, plus appealing site entrance and exit area treatments.

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