Why such a big hole in front of new Town Hall? It is for a new pool?
No, this is where the parking lot for new Town Hall is going, and digging to that depth is needed to build a permeable paver parking lot, which is just like the Municipal lot between Hanover Avenue and S. Railroad Avenue.
Why permeable pavers, you ask? I'm glad you asked! Stormwater carries contaminants (fertilizer, animal waste, vehicle fluids, etc.) that run off streets, parking lots, yards, and other surfaces, washing into streams and rivers and, ultimately, to the Chesapeake Bay. More volume of runoff, which erodes streams, comes from paved areas unless permeable surfaces are used. Stormwater infiltrates between permeable pavers and is stored in a stone reservoir. In the reservoir, water waits to soak into the ground. This means less stormwater runoff, which means less erosion in stream and less contaminants to streams, rivers and the Chesapeake Bay.
This is where the hole comes in! In the parking lot construction for a permeable paver lot, 33.6 inches is excavated for the stone “reservoir,” where water is stored while waiting to infiltrate into the ground. The excavation depth also includes 4 inches of transition stone, 2 inches of choker stone, 4 inches for the paver block and 6 inches for the curb (we also had to remove about 6 inches of bad soil in a couple of locations). Total Excavation? 55.6 inches - four and a half feet!
The Town Hall lot will be the same as the Municipal lot, minus the rain garden. For a fun refresher on the Municipal lot construction, check out this time lapse video.
If you have any questions about this project, please feel free to contact our Town Engineer, Ingrid Stenbjorn, at email@example.com.