	# 5

Puyallup Wastewater Treatment Plant No. 6 improvements

Project description: Modify an existing 14 million-gallon-a-day wastewater treatment plant by changing the treatment process from a rotating biological contactor process to an aerobic-activated sludge process. Major design modifications provide for the construction of a complete new liquid stream facility, including new aeration basins, two secondary clarifier units and a new RAS/WAS pump station. Also, complete modification of the existing solids handling facilities, addition of a UV disinfection system and installation of new outfall diffusers.

Address: 2028 River Road, Puyallup

Original contract amount: $20,025,353

Start of construction: Jan. 5, 1998

Expected completion date: Dec. 31, 1999

Contractor: Robison Construction Inc., P.O. Box 1730, Sumner, WA 98390, 253-852-4254

Engineers: Gray & Osborne Inc., 701 Dexter Ave. N., Suite 200, Seattle, WA 98109, 206-284-0860; Parametrix Inc., 1231 Fryar Ave., Sumner, WA 98390, 253-863-5128; Conley Engineers Inc., 205 N. 40th Ave., Suite 201, Yakima, WA 98908, 509-965-9872

Owner: City of Puyallup

Project participants: American Bulk Conveyor; DeZurik; Familian Northwest; H.D. Fowler; Humboldt Decanter Inc.; Lakeside; Lamson; Miles Sand & Gravel; Pacific Water Works; Puget Sound Steel Co.; RPM Steel; Sanitaire; Standco; Totem Electric of Tacoma Inc.; Washington Crane & Hoist; and Westec.