This project included significant sitework, including the clearing and development of 33.5 acres in Federal Way. The Walmart portion included clearing and grading, involving the excavation and removal of 460,000 cubic yards of dirt. Due to the slope of the lot, a 35’ high shotcrete retaining wall was built with sculpted colored finishes, totaling 18,000 square feet. There was also an additional 28,000 square feet of modular block retaining walls. Two cast-in-place concrete storm water detention vaults totaling 650,000 cubic feet of storage capacity were also installed. The outparcel sites, which totaled 11 acres, included the preparation for four restaurants and six additional retail spaces.
Upon completion, there as a total of 68,000 square feet of asphalt paving, 48,000 square feet of sidewalk, 70,000 square feet of concrete paving, 21,000 linear feet of cast-in-place curbs, and a 25,000 square foot wet pond with an emergency generator to operate three discharge pumps.
Offsite improvements included a new traffic signal and street lighting.
The Walmart Supercenter building was constructed between June ’06 to January ’07. The store included 205,147 square feet of indoor sales and 9,458 square feet of outdoor garden center sales. Approximately 160,000 square feet of the sales floor has integrally colored concrete that included a hardener/densifyer application along with a 14-day wet cure process. The Supercenter included full grocery sales, a tire & lube center, garden center, pharmacy, photo center, hair salon, nail salon, Subway restaurant, and bank. The exterior of the building included 8 heavy-timber wood truss canopies, split face CMU, cultured stone, precast sills and cast in place concrete pillars. Sierra successfully delivered the store to Wal-Mart in 188 calendar days. The grand opening was January 22, 2007.