WWTP Rehabilitation Project Update for July 16, 2018

WWTP Rehabilitation Project Update for July 16, 2018

The Sewerage Agency of Southern Marin launched their 2-year, $20 million Waste Water Treatment Plant (WWTP) rehabilitation project in April 2018. Improvements include infrastructure modernization, increased reliability and efficiency, electrical upgrades, and odor reduction.

The majority of critical equipment submittals have been reviewed, accepted, and are on order.

The contractor and electrical subcontractor have mobilized and remain on schedule.

Work completed includes the following:

  1. Completed 274 CY concrete pour to support the new odor control facility.
  2. Completed the replacement of two large water gates that control treatment process flows.
  3. Completed the sandblasting, structural concrete repair, and urethane coating application to sewage conveyance system within the headworks building.
  4. Removed all the mechanical equipment within Primary Clarifier Bays #1 & #2, started the urethane crack injection, and structural concrete repairs.
  5. Shutdown and partial demolition of Trickling Filter #2.

The next 3-week look ahead involves demolishing Trickling Filter #2 including the sheet metal, structural metal supports, and bio-filter media. Other planned work includes installing a 4,000 gal above-ground diesel fuel tank pad, and installing electrical conduit from motor control centers to equipment and pumps.

In addition, concrete repairs to Primary Clarifiers Bays #1 and #2 will commence, including, a specialized thick coating system which will restore the structural concrete and significantly extend the service life of the concrete bays. Concurrently, the contractor is replacing deteriorated mechanical gears, chains, rails, and drive motors. This concrete restoration is an alternative to our initial plans and will present short and long-term budget savings.

“This Master Plan is a critical component of managing our Wastewater Treatment Plant for the next several decades,” said Lew Kious, President of the SASM Board. 

Phase 1 of the project is expected to take two years and is estimated to be completed in early 2020.  Construction costs will be paid through a $38 million bond approved by the SASM Board in November 2016.  The SASM Board of Directors is comprised of six member agencies – City of Mill Valley, Tamalpais Community Services District and the Alto, Almonte, Homestead Valley and Richardson Bay sanitary districts. The City of Mill Valley is the contract operator to the six-member agency in order to ensure collaboration, cooperation and to deliver efficient, cost effective and environmentally responsible services to the community.

Learn more here.

Concrete pour of new 8-ft tall perimeter wall. 

Dismantling trickling filter #2 prior to replacement.

Pouring 5-ft thick concrete slurry foundation for new odor control facility.