I've received some more information from the City of Rockville about the mysterious underground work going on under the square at Rockville Town Square. It is related to the underground stormwater management system at the property. There is a sand filter located underneath the square.
Stormwater runoff from hard surfaces, parking lots and buildings at and nearby the Town Square is routed through pipes into that underground sand filter - water from nearly 10 acres of surfaces. The filter removes sediment and debris, and then discharges the treated water into Maryvale Park and Rock Creek.
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