2008 Brightwater Outfall Project
American Construction Company (ACC) was awarded a subcontract by Triton Marine to install the 1-mile long Brightwater Outfall onto the seabed of the Puget Sound near Seattle, Washington. This work involved the installation of an open trench comprising of temporary sheet piles with steel walers, horizontal strut supports and a temporary work trestle. The temporary trench was used to install two new outfall pipelines. ACC installed sheet piles and supported the sheet pile trench with inner steel bracing. The trench spanned 13 feet across at the shallow areas (on the beach) and 20 feet across at the deeper end. Once the sheets were braced in place, it was dug down using a clamshell bucket. Spoils from the excavation work were stored and placed on barges and at designated containment areas on the beach to be reinstated later, as backfill material. Once the outfall was installed, the sheet piles and temporary work trestle were removed.
This project earned the prestigious national "Best of the Best" award in the heavy/civil engineering category from McGraw-Hill Construction and Engineering News-Record magazine.
"American Construction was a key subcontractor managing the pile driving and dredging."
-King County Spokesperson