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 project is now 25% complete.
Construction work continues to progress on schedule and on budget. Work completed since the August monthly update includes:
The next 4-week look ahead involves the installation of the new mechanized water rotary distributor system for Trickling Filter (TF) #2. The final stage involves the “seeding” of TF#2 with partial treated wastewater which is continuously ‘trickled’ or sprayed over the plastic TF media. As the water migrates through the pores of the plastic filter media, organics are then degraded by the biofilm covering the filter material. This seeding process takes 3-5 weeks until the bacteria are populated and mature enough for the trickling filter process to become fully operational and functional.
Other planned work includes:
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.