In Spring 2008, construction began at Legacy Place, a 675,000-sq-ft open-air shopping destination that will feature a blend of more than 80 of the nation’s leading fashion, restaurant and entertainment tenants. Located in Dedham, Mass., Legacy Place will also serve as home to the new world headquarters for property owner National Amusements.
Following the state’s storm water regulations, the project engineers at Allen & Major Associates Inc. needed to maintain the site’s historic rate of runoff despite the new development’s increased number of impervious surfaces. They also had to provide runoff recharge to the groundwater and perform water quality treatment prior to discharge to surface waters. The site presented some additional challenges, including the varying ground elevations in relation to the groundwater level and insufficient space for the adequate number of above-ground storm water systems.
To address the varying ground elevations, two types of CULTEC underground storm water chambers were selected. Typically, a CULTEC system design uses the largest chamber that meets the site’s depth constraint, reducing the land and number of chambers required. Instead, this project specified the Recharger 330XL, a large-capacity chamber, in order to retain and recharge storm water in areas where the depth permitted. The project also utilized the company's lower-profile Contactor 125HD heavy-duty chambers to accommodate the site’s depth-restricted areas. The latter chamber can also be used in applications where a large infiltrative area is required.
The chambers are being installed in four beds that, upon completion, will occupy 52,467 sq ft and provide 74,692 cu ft of combined storage. Employing underground chambers made it possible to create some additional parking spaces, which will be located above the system, thus helping to address a space constraint issue.
“We were pleased to work with CULTEC, whose systems were previously used by the town of Dedham,” said Brian Jones, senior project engineer with Allen & Major Associates. “The company’s chambers are very cost-effective, and CULTEC’s staff provided us with shop drawings to assist us in designing the system.”
Source: CULTEC Inc.
