Heavy rains in late 2005 and early 2006 caused the 24-inch diameter and 40-foot long culvert Chqui Creek to plug with debris and the creek overtopped its banks. The high flows were diverted over Lower Cappell Road and caused erosion along the road shoulder and around the culvert outlet. The project involved excavating the roadway, removing surface. Excess loose material around the culvert inlet area will be removed, and scoured areas around the culvert outlet and along the embankment will be restored.
Culvert excavation and replacement activities will temporarily impact 600 square feet and 60 linear feet of ephemeral stream channel including 400 square feet and 40 linear feet if channel that is already filled by the existing 24-inch diameter culvert and fill. Rock slope protection at the culvert outlet will permanently impact 36 square feet of stream channel and 12 linear feet stream bank. The proposed 36-inch diameter and 4-foot long culvert will be placed in the same location as the existing culvert and will not result in any additional permanent impacts to the stream channel.