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Board reviews cobblestone entrance plan for Riverrun, asks for engineered detail and HOA maintenance agreement
Summary
The board discussed a proposal to install a cobblestone entrance at the Riverrun subdivision to protect the roadway edge from tractor-trailer damage, requested engineered construction details and recommended adding maintenance responsibility to the homeowners association documents.
The Brentwood Planning Board reviewed a proposal to replace temporary riprap at the Riverrun subdivision entrance with an engineered cobblestone strip designed to withstand occasional tractor-trailer encroachment and to improve aesthetics.
A board member explained the issue: large vehicles pulling into the subdivision were driving off the asphalt edge into soft ground, creating mud and ongoing degradation. As a temporary measure, riprap (large stone) had been placed; the proposal on the table is an engineered cobblestone inset to the roadway, similar to the cobblestone panels used in roundabouts to accommodate trailer tires.
Nut graf: Board members asked for engineered construction details and recommended that responsibility for future maintenance be incorporated into the subdivision’s homeowners association (HOA) documents so the town would not assume long-term maintenance costs.
Engineering suggestions discussed included an 18-inch subgrade removal and replacement and full construction details to ensure the cobblestone will stand up to heavy truck loads. Chris Raymond (engineer referenced in the discussion) and the proposing party will provide engineered drawings and construction details. The board noted some of the proposed work sits in the right-of-way and said that engineered plans and a maintenance agreement (HOA) would clarify responsibilities.
Several board members said the cobblestone feature is designed to be uncomfortable for ordinary passenger traffic while being structurally adequate for tractor-trailer trailer-tire loads; the stones are typically inset in concrete. Board members also discussed notifying adjacent residents though they understood most of the area likely sits in the right-of-way.
Ending: The board asked for engineered plans and recommended the proposer include the maintenance obligation in the HOA documents; staff forwarded the email chain and will expect construction detail submittals and HOA documentation before any field changes are authorized.
