The Butterfield/Arroyo-Kenrick Gravity Sewer Improvements Project installed 0.3 mi of diversion and replacement gravity sewer in San Anselmo between Arroyo Avenue and Kenrick Drive (on Butterfield Road) and replaced 0.3 mi of gravity sewer in Sleepy Hollow on lower Fawn Drive. The Butterfield section was the last capacity project required in the Cease and Desist Order from the Regional Water Quality Control Board, and the Fawn Drive section provides needed capacity and pipe replacement to prevent sanitary sewer overflows and reduce maintenance requirements.
Also included was 1,600 feet of new sewer line in the Butterfield Road right of way. Approximately 1,050 feet of sewer line in front yard easements were abandoned. Work on Fawn Drive replaced approximately 770 feet of sewer lines from Butterfield Road to #271 Fawn Drive.
Project Manager - Phil Benedetti
Call: 415-259-2949 x212
Click the photos below for a larger view of the project areas.
Ross Creek Sewer Removal Project
Completed: October 2021
Contractor: Coastside Construction
The Ross Creek Sewer Removal Project removed an abandoned 21-inch diameter sewer from the creek bed of Ross Creek at the Shady Lane bridge. In order to minimize upstream erosion, natural rock features were used to create a sustainable riffle structure in place of the sewer (which was originally installed in 1926 and a replacement siphon was installed 7.5 feet below the streambed in Oct. 2019).
The abandoned sewer removal from the streambed provides a more natural-looking water feature as viewed from the Shady Lane bridge, as well as the environmental benefits of improving conditions for anadromous fish migration of the native steelhead trout population of the Corte Madera Creek watershed.