Gleneden Stormwater System

Posted in Stormwater
Gleneden Stormwater System

A rain storm in early 2016 demonstrated the inadequacy of the stormwater system in the Gleneden neighborhood north of the City of Spokane. Retrofits to the system were subsequently designed, and the work to complete those retrofits and to fix erosion created by the uncontrolled runoff were performed in October 2016. The ground disturbing work on the Project Area included three stormwater installations that each included a drywell, curb drain, catch basin, and sundried piping to make connections to existing stormwater installations. In addition, an eroded slope on the south slope of the landform was repaired.

On-site excavation monitoring was preformed by Plateau for all three stormwater installations and intensive pedestrian survey was completed for all four areas. Discussion with the Spokane County Engineer’s inspector, and the foreman for the L & L Cargile crew indicated that no excavations were planned to repair of the eroded slope. Each stated that the work would be accomplished by filling and compacting the erosion, and thus Plateau did not monitor this aspect of the work. Plateau returned to verify that the work had proceeded as stated, and determined that no unanticipated excavations had been performed.

A review of previously recorded cultural resources and archaeological surveys was conducted implementing a 1.0 mi (1.6 km) buffer. This resulted in no previously conducted cultural surveys and one known archaeological isolate southwest of the eroded southern slope. Throughout intensive pedestrian survey, Plateau archaeologists were unable to find any evidence of the isolate near the APE. Archaeological monitoring during the approximately 1,003 yd3 (767 m3) of excavation for the Gleneden Erosion Repair / Stormwater Retrofit Project did not reveal any precontact or historic-era cultural materials, deposits, or features.

Location: Spokane County, Washington