Tunnel Business Magazine

FEB 2018

TBM: Tunnel Business Magazine is the market leader for North America. TBM is written for leading professionals in all aspects of tunneling and covers project stories, design elements, contracting strategies, legal issues, new technology and more.

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Page 8 of 43

TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // FEBRUARY 2018 Narragansett Bay CSO Phase III Tunnel Under Design agansett Bay Commission C) has begun conceptual design of the third and final phase of its Combined Sew- er Overflow Program. Phase III includes the Pawtucket T C's second CSO stor C completed the Provi- dence Tunnel, a 16,500-ft long, 26-ft diam- eter CSO storage tunnel, in 2008 during Phase I of its CSO program. The Pawtucket Tunnel will be approxi- mately 13,000 ft long, 28 ft in diameter and located in bedrock about 200 ft below the ground surface. The contract to con- struct the Pawtucket Tunnel will include the launch and recovery shafts (which will become permanent access shafts), two to three drop shafts with connecting adits at existing outfall locations, and an underground shaft- or cavern-style tun- nel pump station. chanical fit out of the tunnel pump station will be performed under a sepa- rate contract. Construction of diversion structures, gate and screening structures and consolidation conduits at existing outfall locations will be performed under separate contracts as well. The launch shaft and tunnel pump sta- tion will be located a C's Bucklin Point Wastewater Treatment Facility in East Providence, RI. The alignment will be par- allel to the Seekonk River and Blackstone River, and end near the border of Paw- tucket and Central Falls, Rhode Island. An 8,800-ft long, 10-ft diameter conveyance tunnel, which will connect to the Paw- tucket Tunnel, is planned to begin after the Pawtucket Tunnel is completed. The program/construction manager for Phase III is Stantec and its teaming partner Pare Corporation. Construction of the Paw- tucket Tunnel is anticipated to begin in late 2020 or early 2021. DLZ Wins ACEC of OH Award for OARS Tunnel The American Council of Engineering Companies (ACEC) of Ohio awarded DLZ with an Outstanding Achievement Award for the OARS-OSIS Augmentation & Relief Sewer project in Columbus. This presti- gious award is given to engineering firms for projects that demonstrate a high degree of achievement, value and ingenuity. The OARS project consists of the con- struction of a 20-ft diameter, 170-ft deep tunnel that provides relief to the existing OSIS from just north of the Arena District in downtown Columbus to the Jackson Pike Waste Water Treatment Plant (about 23,300 ft in total length). Once the OARS is operational, more than a billion gallons of combined sewage overflows will be treated instead of dis- charged to the Scioto River each year. 9 B U S I N E S S B R I E F S

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