City of Lacey - College Regional Stormwater Facility

Skillings Connolly completed design for the City of Lacey's College Ditch Stormwater Facility project. College Ditch is a conveyance route that carries stormwater runoff from central Lacey into Woodland Creek, a tributary of Henderson Inlet on Puget Sound and Lacey's main drainage path. The overall College Ditch drainage basin encompasses about 1,000 acres, of which approximately 420 acres is located south of the I-5 corridor and is the tributary area draining to this project site. Stormwater runoff from this area currently flows untreated via storm sewer pipes to a culvert under I-5, then along College Ditch into Woodland Creek.

Since this stormwater runoff is a primary source of pollutants and erosion affecting the creek, Skillings Connolly was tasked with designing a stormwater facility to control runoff flows and minimize pollutant loads and soil erosion in College Ditch and Woodland Creek. The PS&E for the stormwater facilities construction will improve runoff water quality and control discharge flows within the area. The facilities include stormwater treatment/control ponds, reconfiguration and construction of piping, and connections to existing infrastructure. The project, sponsored by the City of Lacey in cooperation with Saint Martin's Abbey, is located on the campus of Saint Martin’s University in Lacey. Skillings Connolly performed construction management on this project which involved construction monitoring and contract administration for the construction of 3 large stormwater treatment ponds and associated storm sewers. Construction staking and stormwater monitoring was also performed.