Merlo Fuel/Wash & Lift Station Tank Installation

Location: Beaverton, Oregon
Client: Confidential Engineering and Consulting Firm
Contract Value: $1,142,087

AEC was selected to perform this project as a smaller portion of a larger infrastructure contract awarded to a large design engineering firm. AEC’s scope consisted of the design and installation of 4 x 20,000 gallon fiberglass fuel tanks at the TriMet Beaverton site. Originally, AEC was asked to excavate the area at a slope which would enable us to walk in and out of the tank area. It was clear to the project team that the slope technique would create a very large footprint at the site and thereby infringe on bus operations. It was decided that instead, AEC would dig the hole at a straight, 16 ft vertical and design a shoring system that would allow us to perform the work within a smaller footprint and without jeopardizing the integrity of the excavation. The new shoring system would also require an extensive amount of dewatering. Since water handling was not bid into the specifications, AEC had to design and install a dewatering system with 52 well points to remove approx. 80,000 gallons of water due to the high water table in the area. With the new MegaBrace shoring system in place and the hole dry from dewatering efforts, AEC placed the 4 x 20,000 gallon fiberglass fuel tanks using a crane. We were asked to redesigned the piping and turbines associated with the new system because the specs were inadequate. Once we piped the underground and the new building was constructed by a large design engineering firm, the client wanted to put a 6,000 gallon critical fluid tank with 3 compartments inside the bus fueling station. AEC designed piping for that system and an air system to support their hoses. Essentially, Trimet wanted the buses to be able to fuel and receive critical fluids all in one area.  AEC did some decommissioning work on a change order and removed contaminated soil in another area.

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