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Downtown Concord retaining wall project proposed to fix Millbrook undercutting
Summary
A developer-led plan for a failing Millbrook retaining wall near Walden and Main streets would rebuild the wall using precast modular blocks, add a new catch basin with pretreatment and move pavement back from the stream; the commission requested staging details, pump specs and revised plans before Oct. 1.
At the Natural Resources Commission meeting, Robert Melvin of Stampski McNary presented a downtown project addressing a failing retaining wall along Millbrook behind Main and Walden streets.
Melvin showed photos of undercut pavement and wall deterioration and described a rebuild using precast, modular block retaining elements, with a temporary coffer dam, dewatering pumps and sediment filtration during construction. The proposal includes removing a length of the wall, lowering adjacent pavement to accommodate a new catch basin with a CDS pretreatment device, and riprap and granite curb work to protect the basin outlet.
Commissioners and staff asked for clarifications on construction staging (location of heavy equipment), the type and specification of dewatering pumps (electric vs. gas), and additional details about material lifespan and structural specifications. The structural reviewer has provisionally endorsed constructability, but commissioners asked the applicant to submit revised plans and staging details by next Friday so the NRC can prepare an order for the Oct. 1 meeting.
No permit decision was made at the hearing; the commission’s questions centered on durability, staging area and minimizing impacts to Millbrook during low-flow windows.
