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HomeMy WebLinkAbout20170621 Ver 1_Concrete Spill B-5362 Montgomery County_20180517Carpenter,Kristi From: King, Art C Sent: Thursday, May 17, 2018 10:35 AM To: Andy Williams; Norton, April R Subject: Concrete Spil) B-5362 Montgomery County Attachments: 20180516_140648_OOOjpg;20180516_145536_ OOOjpg;20180516_152852_OOOjpg Andy, April, The barrier rail contractor on Bridge Project B-5362 (Bridge #53 Montgomery County SAW-2012-02004) had a severe equipment malfunction during a concrete pour on Wednesday 5/16/18. The result was a moderate amount of live concrete was spilled into the stream (Drowning Creek ws-ii; sw, HQw). The contractor had a catch system in place that consisted of a large "I" beam covered with plastic which had worked well prior to the malfunction. The vast majority of the concrete was contained on the bridge or caught by the "I" beam, however about (estimated) 15-20 gallons of concrete made it to the stream when the machine had to be forcibly removed from the rail. The vibration system on machine had failed and the concrete within the form could be compacted, so when the machine form was removed the loose concrete slumped and fell in an amount that was too great to be easily caught. The contractor immediately put workers into the stream to remove as much material as they could, but much of the wet concrete was dispersed by the current. However, they were able to rake nearly all of the gravel out of the water. An additional note; after the workers finished racking out the gravel, and the current cleared the stream bed, we noticed that a number of fish had migrated to the area of the concrete spill and stayed hovered there. If you look closely you can see them in the 3rd picture. Please let me know if you have and direction on additional clean up or, if you have any questions. Thanks, Art C. King Division Environmental Officer NCDOT Highway Division 8 910-944-2344 office 910-690-6581 mobile acking@ncdot.gov 902 N. 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