Yes, the Town has sufficient water and sewer capacity to support Trinity’s proposed redevelopment while still retaining capacity under its permits and to allow for future development in Medfield. Two studies have been completed this year, in addition to two studies commissioned by the Town in 2019. All four studies conclude there is sufficient capacity.
On behalf of Trinity Financial, their engineering consultant, VHB, developed conceptual water and sewer infrastructure plans, sewer flow estimates, and water demand estimates. VHB’s report is available for review here. VHB anticipates the proposed redevelopment will generate 56,295 gallons of wastewater that needs to be treated by the Town’s Wastewater Treatment Plant. VHB anticipates the proposed redevelopment will require 61,925 gallons of water per day, based on a 10 percent increase over estimated sewer flows to account for non-consumptive uses.
The Town hired its engineering consultant, Environmental Partners, to peer review Trinity’s wastewater flow and water demands. The Board of Water and Sewerage also discussed the estimates at their meeting on June 7 and board members noted that there is sufficient capacity. The video of this discussion is available here. Christian Carpenter, a member of the Board of Water and Sewerage, met with the Warrant Committee on June 13 to discuss water and sewer impacts further.
Environmental Partners is an engineering firm that performs significant utility engineering for the Town and has assisted the Town with numerous other projects. Environmental Partners conducted a peer review of VHB’s report on behalf of the Town. The firm agreed with VHB’s estimated wastewater flows and water demand as they were prepared using standard methodology. Environmental Partner’s peer review is available here.
Excerpts from Environmental Partners’ peer review are below:
- Environmental Partners’ initial evaluation finds that current proposed project’s estimated peak day water demands of 61,925 gpd (0.06 MGD) could be accommodated under current authorized limits provided that the Town continues to be proactive with its water conservation programs.
- Based upon a review of recent historical April and September WWTP flow data (2019 through 2021), the Town’s existing WWTP can accommodate the estimated sewer generation from the MSH development. The Town is currently working on reducing I/I (Inflow and Infiltration) issues in the sanitary sewer system. The MSH development is located in Sewershed Area 1. The Town should identify an equivalent level of I/I reductions in Sewershed Areas 1 and 2 (contributes to Area 1) to offset the proposed MSH development flows.
Environmental Partners also reviewed the wastewater flow and water demand in relation to the Town’s existing permits. For water, the Town would have complied with its water withdrawal limits each year since 2011, except 2014 and 2015 when it would have slightly exceeded its permitted withdrawal amounts. Since 2015, the DPW Water Division and the Board of Water and Sewerage have worked diligently to identify and repair leaks. Fixing these leaks decreases the Town’s unaccounted for water (water pumped at our wells but that does not pass through a water meter to a customer) and expands the amount of water capacity under the Town’s permitted amount.
The Town’s Water Management Act permit allows the Town to pump an average of 1.51 million gallons of water per day over a calendar year. The Town’s five wells have a design capacity to pump well above the limits in our permit. This capacity will be expanded further upon the completion of the new water treatment plant project at Wells 3 and 4 (anticipated Spring 2023), an important project for the Town which is being pursued irrespective of the proposed Medfield State Hospital redevelopment.
