2019-09-03-CONCOM-min - Laserfiche WebLink

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Area Delineation earlier in 2019. Ms. Buczynski stated that the proposed addition includes a corresponding driveway and overhang. The current gravel driveway is proposed to be paved with an underground infiltration system to be installed. A walkway and ramp are proposed along the side of the building adjacent to the wetlands. Due to requirements by the Fire Department, they are required to have a point of access around the entire building. There are two proposed infiltration detention basins. The drainage system is designed in a "round about" way in order to capture and treat all water runoff from the building. A catch basin and rip rap is proposed to be installed in order to slow the flow of water coming out onto the conservation restriction area. Ms. Buczynski additionally explained they may have to replace an existing gas line. A lighting plan was not submitted but will be submitted for review for the following meeting. Ms. Ladd asked what happens to the water runoff from the new paved walkway. Ms. Buczynski stated that the walkway is tilted inward. A leaching basin may have been installed but Ms. Buczynski will follow up regarding that. Ms. Buczynski stated that the walkway is paved in order to achieve the 5% grade requirement for accessibility. Mr. Beuttell asked how the fire gravel access drive is being modelled. Ms. Buczynski stated that it was modeled as runoff curve number 80. Mr. Beuttell noted that the driveway is supposed to be over compacted dense stone which is impervious. Mr. Beuttell asked if it were possible to alter the model to allow at least a little bit of water infiltration in there. Mr. Beuttell noted that the discharge point for the walkway is still going to allow for a fair amount of water moving through the area. It is located about five feet up on the slope. Mr. Beuttell raised his concerns regarding the slope and how it will affect erosion. Ms. Buczynski stated that they will re -design the walkway. Ms. Ladd asked what kind of vegetation is on the wetland side of the walkway. Ms. Kearns stated that there is a lot of buckthorn and other woody vegetation. It is a mix of native and invasive. Mr. Bitsko asked if it were possible to install a more natural basin just north to the proposed gravel fire access driveway. This could provide a series of step pools down to the actual wetland in order to eliminate the pipe to evoke a more natural flow. Ms. Buczynski stated that they will look into it further. Mr. Langseth asked if the existing design has a grate on the top.