Pennoni Perspective Volume 22 • Issue 2 • Summer 2018 - Page 7

Other aspects of the project included: • The number and volume of combined sewer overflows were reduced by disconnecting the highway runoff from PWD’s combined sewer system. Six new stormwater outfalls were designed and constructed from I-95 into the tidal Delaware River. These outfalls ranged in size from 42" to 84" in diameter of reinforced concrete pipe which were constructed on pile supported foundations because of poor soil conditions. • Use of a lightweight foamed glass aggregate (15 pounds per cubic foot), manufactured by Aero Aggregates, to construct a portion of the highway embankment supporting the new southbound on-ramp to I-95. This ramp extended over a portion of a PWD 10' x 10' reinforced concrete box intercepting sewer constructed in 1929. The use of the lightweight aggregate ensured no additional load was placed on the sewer. • Construction of smaller diameter water main distribution piping and sewer collection infrastructure, including a jack and bore installation of a sanitary sewer line along an active Conrail railroad siding, that was also relocated as part of the project. For more information on this project and innovative engineering solutions, please contact: Harry Laspee, PE Associate Vice President 215-254-7730 Kazi Hassan, PE Project Engineer 215- 254-7720 Andrew T. Stathos, PE Project Engineer 215-254-7727 These PWD infrastructure improvements, with an approximate construction cost of $40 million were completed in conjunction with the PennDOT I-95, CP-2 Interchange Project. PENNONI | 7