Snohomish County Public Works, Surface Water Management Division, modified the existing stormwater pond located at the intersection of Meridian Dr SE and 109th Place SE in order to reduce high flows downstream and improve water quality. The modifications included excavating the pond to provide additional storage capacity and deepening the permanent pool to encourage pollutant settling.
Additional work consisted of constructing concrete retaining walls and a rockery that make up the pond walls and maintenance access ramp, installing fencing around the perimeter of the pond, and placing new storm water pipes and structures to and from the pond. In order to construct new curb and gutter, sidewalk, and a landscape buffer, approximately 12-feet of roadway width was removed along the west side of 109th Place SE.
Signage and traffic control were provided to route traffic around the construction site.