12/17/2025 PLANNING BOARD Minutes (2)

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of TMs s,s z. AU1MLIUV�y own qf MaS 2 Panning Board c� 16 Great Neck, RoadNorth JWashpee, wMassachusetts 02649 Regarding comment 9 about catch basin location and frequency, she agrees that the 300ft. spacing is typical for subdivision roadway design, but when that sag curve here is at the low point, she wants to be sure that catch basins grate has capacity to accept more than 300ft. She doesn't have a problem with the design,just wanted to double check the calculation. She is okay with this only if it will not present drainage problems per the calculation. Regarding comment 10, the roadway slope being no less than 1%, typically the roadway grades are given a tolerance of half a percent, there is possibility that road could be built at a half percent, we could have a shallower slope for a portion. She agrees with the understanding of not having it at 0%, but making the 1% section 1.5% is best practice as it will ensure a 1% grade as built which will help with drainage. Mr. Crispin stated the subdivision standards read a minimum road grade of 1%, and 2 points coming to a vertical curve, where the center is 0 slope, he argues this is not possible. He would like to resolve this with the Board Engineer outside the hearing. Ms. Waygan asked if they could physically incorporate what Tighe & Bond is asking. With rain events being more intense and weather changes, she is tending to be more conservative and follow the engineer's recommendation. Places that never flooded before are flooding now. Ms. Christy stated all other comments were addressed or will be answered with the submitting of revised plans. Ms. Waygan commented on peer review letter two dated December 10t". Usually, if an item is handled or resolved, it will drop off. The final peer review letter three will have any remaining guidance, we do make special exceptions, but we like the materials as soon as possible. We will take it at our meeting but submit the week prior. Ms. Faulkner inquired about number 17 and the stormwater catch basins and the manhole, with the velocity possibly causing erosion. Ms. Christy answered when we look at stormwater collection, there is a sweet range for flow where we want it to flush debris but not be too fast where erosion occurs. This length of pipe is short, so it may be fine. Mr. Milbury asked what material is being used at the cul-de-sac. It was answered there are only five homes, so they asked for a waiver, if there is a real problem they will pave it, but in today's work we try to minimize amount of pavement. Mr. Tobin answered from the Fire Chiefs comments, if the waiver is granted the cul-de-sac needs to be hard packed for a fire truck to turn around. The second comment the Chief made was regarding an emergency lane, extending to the doorway of the tennis courts hard packed 12