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CASE STUDY Highland Plaza Holbrook, Massachusetts Storage Provided: 6,177 cu. ft. Area: Number of Units: 160 Installed: Project Engineer: R J O’Connell & Associates, Inc. Stoneham, MA Contractor: S L T Construction Corp. Carver, MA When a new CVS/pharmacy® store was slated to come to Highland Plaza in Holbrook, Mass., the development site required a number of design changes and upgrades. Three firms came on board to bring the improvement ideas to life. Reeves Design Associates was responsible for the site architecture; BKA Architects, Inc. designed the CVS/pharmacy; and R J O’Connell & Associates, Inc. took charge of the engineering aspect of the redevelopment. The Plaza was comprised of approximately 42,500 square feet of retail and restaurant space. According to Philip Henry, P.E., Project Manager with R J O’Connell & Associates, the renovation project included construction of a standalone 13,500-square-foot CVS/pharmacy with a double full-service drive-thru; relocating the existing Family Dollar store from the north end of the Plaza to the south end; demolishing approximately 9,600 square feet of building; and implementing façade improvements to the existing structures. The front parking lot had to be re-graded and re-striped. Additionally, landscaping and other aesthetic improvements were installed to revitalize the Plaza. Stormwater upgrades to the entire site were a key part of the project. An existing stormwater system, which consisted of catch basins and pipe, connected to the Massachusetts Highway Department (MassHighway) drainage system running along Route 37. The connecting drain pipe was built circa 1960, and the site drained its runoff into the state system for about 50 years. However, MassHighway mandated that the pipe be disconnected, in accordance with its 2006 Directive. As a result, the Plaza’s stormwater runoff was re-routed to an upgraded 24-inch HDPE pipe running down West Division Street. In addition to replacing the connecting pipe, the R J O’Connell & Associates engineers had to provide 6,177 cubic feet of detention storage for the 4.4-acre site. (continued on back) Stormwater Solutions

Highland Plaza Holbrook, Massachusetts (continued) In cases where all the stormwater needs to be kept onsite and the development area needs to be maximized, the engineers have traditionally used subsurface chamber systems provided by CULTEC, Inc. This time, the engineers selected the low-profile Recharger® 150 HD unit from a variety of available chamber sizes. “The Recharger 150 helped us to accommodate the shallow groundwater at 5 – 7 feet below the finished grade,” said Henry. The system captures runoff via the outlet control structure manhole containing an 8-inch orifice at elevation of...