2021-02-01-CONCOM-min - Laserfiche WebLink

Browse Search

— There is currently a low-quality wetland habitat in the construction easement with a presence of invasive species. Historic utility work has altered the drainage pattern. — Vegetation should grow within the rip rap and, if not overtaken by severe storms, grass will grow within the riprap. 7:50 PM Informal Meeting: Town Engineering Project, Drainage Improvements Waltham Street Culvert, Woodard and Curran Mr. Michael Sprague, Senior Civil Engineer for the Town of Lexington, and Denise Cameron, Project Manager at Woodard and Curran, presented the proposal before the Commission. The purpose of this proposal is to address localized flooding issues in the neighborhood of Valleyfield Street and Grassland Street due to the area being of very low gradient. Ms. Cameron stated that most of the work is to be done within the street itself and within the 200-foot riverfront area. Questions from the Commission: — Were you able to find construction records to see what geotechnical conditions other utility companies ran into? — Would you make the culvert wider if there were no width constraints? — Is the proposal to do a natural stream bed in the culvert? Responses from the Representative: — There are no records that indicate that when the culvert went in there was any mitigation. The sewer is unknown but they did look at the latest CCTVs on the sewer and it is in good shape. Anticipate the removal of some peat. — We want to be able to allow them to open up sections and get in fairly quickly. We are limited to a trench box but still have some flexibility and will look into it. — It will be challenging to accomplish a natural stream bed because of how close the utilities are currently. Mr. Bitsko asked whether this type of work is done when it is dry or when there is less flow and whether the project team will be promoting a certain construction schedule. Ms. Cameron responded that the preference is July and August when the stream volume and chance of storms are the lowest. 8:06 PM Informal Meeting: MyRWA Stormwater Improvement Grant, Town Land Maple Street Mr. Michael Sprague and Ms. Catherine Pedemonti, Project Manager at the Mystic River Watershed Association, presented the proposal before the Commission. Ms. Dohan asked if there will be a potential for educational opportunities and the project team will be discussing that in more detail once they have a better idea of what is out there.