Pelham Road Mitigation Site (Site #31) is an advanced mitigation site located west of Exit 2, south of Pelham Road, and consists of three former lots of varying dimensions totaling 25 acres in size. Porcupine Brook, a designated Salem Prime Wetland, passes through the site. A portion of the northern-most lot was subdivided and is occupied by a commercial skating rink. The portion of the lot used for mitigation was degraded, having served as an area for excavation and for disposal of fill materials and refuse. These portions were developed into wetlands and combined into the Porcupine Brook wetland system (for additional flood storage) with minimal site grading and excavation. Principal wetland functions and values provided by the site include flood flow alteration, sediment retention, nutrient removal, sediment/shoreline stabilization, and wildlife habitat. The site provides about 4 acres of creation/enhancement and about 21 acres of preservation. Construction was completed in 2001.