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Active Projects
- WWTP Rehabilitation Project (Phase 2) Update
- Digester #2 Rehabilitation Project
- Miller-Sycamore Manhole Rehabilitation
- Miller-Sycamore Sewer Trunk Lines Rehabilitation
Location
450 Sycamore Avenue
Mill Valley, CA 94941
Phase Information & Update
The Waste Water Treatment Plant (WWTP) Rehabilitation Project (Phases 1 and 2) is 98% complete. The first phase of the WWTP Master Plan implementation began in April 2018 and was completed in 2020. Phase 2 started in 2020 and will be completed by the end of 2023 The primary goal in this $20+ million dollar program is to help ensure reliable treatment of wastewater, as well as compliance with regional, State, and Federal regulations. Numerous upgrades of major equipment and rehabilitation of existing infrastructure are key components of these two phases of this SASM construction program.
Completed Project Elements and Ongoing Work Activities
The following is a list of completed project elements and ongoing work activities that are progressing well and remain on schedule to be completed by November 2023:
• Headwork Building Belt-press Room Ventilation Modifications:100% complete.
• Rehabilitation of Secondary Clarifier Number 1: 100% Complete
• Rehabilitation of Secondary Clarifier Number 2: 100% Complete
• Hypochlorite Storage and Transfer System:100% Complete
• Rest Area Improvements: 100% Complete
• Digester Tank Number 1 Floating Cover Replacement: 100% Complete
• Cathodic Protection System (CP-1) Replacement: 100% Complete
• Trickling Filter #1 & #2 Media Replacement: 100% Complete
• Main Plant Switchgear Replacement:100% Complete
• Digester Tank #2 Floating Cover Replacement: 85% Complete
Digester #2 Rehabilitation Project Update
Starting April 25th, W.C. Maloney, Inc., will be removing and demolishing the deteriorate 40-yr old structural steel “floating” lid. A large “Biggie” crane and heavy equipment noise should be expected from 7 AM – 5 PM, Monday thru Friday involving metal cutting, crushing, and pounding noise. All demolition work will be performed within SASM’s property line, as no pedestrian safety nor traffic nor impacts are anticipated. All demolition work is expected to be completed by April 29th.
Inside view of the deteriorated lid to be demolished
New Sewer Manhole in Sycamore Park ( 99% Completed)
A new manhole installation over a 30-inch diameter vitrified clay pipe (VCP) gravity sewer trunk line in Sycamore Park in support of SASM’s 2023-2024 Miller-Sycamore Line Rehabilitation Project was completed on August 25, 2023. This improvement will allow better access for staff during routine maintenance, cleaning, and inspection.
Exposed existing sewer trunk line
Newly installed manhole
Miller-Sycamore Sewer Trunk Lines Rehabilitation (Phase 1) (In Progress)
On August 21st, a contract amount of $389,376.00 was awarded to Maggiora and Ghilotti, inc., to perform Cured-In-Place-Pipe (CIPP) rehabilitation of 936 LF vitrified clay pipe (VCP) line through Sycamore Park and across Miller Avenue. This sewer trunk line is a critical component in the SASM’s collection system which transports over 70% of City of Mill Valley’s sewage flow to the SASM’s Wastewater Treatment Plant (WWTP) for processing. This 30-inch diameter gravity sewer trunk line built in the 1950’s era extends from Miller Avenue through Sycamore Park to Sycamore Avenue under the Arroyo Corte Madera del Presidio creek. This improvement will minimize the risk of failure and potential environmental impact. The CIPP installation schedule for the Sycamore sewer trunk line is October 9th and the Miller sewer trunk line is October 11th.