04/13/2023 SEWER COMMISSION Minutes

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She said that she anticipates weekly work sessions to take place as well. At the work sessions, work assignments will be reviewed, the current status of the website will be reviewed and any pending issues that should be covered will be looked at as well as the next steps to be accomplished. Co-Chair, Meredith Harris stated that one of the main goals is to eliminate any redundancy and make the website more user friendly and suggested that the Commission look over what they received today and email any suggestions to either and/or Catherine. NEW BUSINESS 1. Sewer Project Construction Update – Ray Jack. Mr. Jack gave a pictorial update of the ongoing work on Rte. 28 and at the plant. The slabs have been poured at the plant and things are starting to take shape. Inside forms and rebar have been placed for the equalization tank walls. Outside forms will be placed and then they will be able to pour the concrete. No work is being done right now on the North and South collection system, all work is being focused on Rte. 28 at the moment, placing mains and installing manholes. It was asked when the work on Rte. 28 will be complete and Mr. Jack said they are making tremendous progress and they should be done by the end of the Month, maybe a few days after. Mr. Jack stated that the final SRF/IUP is out and has been approved at $12,000,000. 2. GHD – WRRF Quality Control. There was a discussion with Sandra Tripp regarding quality control for the wastewater treatment plant. She explained that the first type of testing comes from a third party testing firm (UTC). They are responsible for testing of things that get taken offsite. For example, they take samples of the concrete and test it for strength and integrity. They also will do soils compaction tests and pavement testing. The second type of testing is called Special Inspections and is required by code. They test the structural integrity of the tanks and structures. This is done by GHD’s on site engineer who also reviews the testing that is done by the third party testing firm. The last type of testing is specific to this particular project which requires a lot of underground piping and above grade piping which all gets pressure tested and witnessed by GHD and is all documented and kept onsite and digitally. HVAC equipment, treatment equipment and electrical gear all have testing requirements. GHD witnesses final testing on every piece of equipment. Anastasia Rudenkho gave a slide show presentation on The Notice of Project Change (plan update) that they are currently working on. The original plan was a 5 phase plan approved by the State in 2015 outlining the different nitrogen management strategies that the Town is implementing to meet its total maximum daily load goals in Popponesset and Waquoit Bay estuaries. It’s been determined, by evaluation, that sending municipal wastewater flow to the private plant at Mashpee Commons and the private plant at the Wampanoag wastewater treatment facility is not an option at this time. Currently, they are working on reviewing and updated the assumptions for reliance on private facilities and Joint Base Cape Cod. In Phase 2, a large portion of the centralized flow was to be directed to Joint Base Cape Cod and Mashpee Commons which, at this time, is not a viable option. They are looking into finding a different place to treat and recharge the flow. It was stated that the Shellfish Propagation Program is currently being field verified with DNR findings. The program is still scaling up and is not at the assumptions that were made for when it is at full scale. Based on the findings it will be determined if it makes sense to bring the program to full scale or does it make sense to look for a different strategy to offset the nitrogen. 2