Trenchless Technology

OCT 2018

Trenchless Technology is the premier communications vehicle for the trenchless industry. Through our multiple platforms, readers receive insights into the trenchless industry, as well as keep connected to the latest news, products and projects.

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Page 27 of 91

28 T R E N C H L E S S T EC H N O LO GY O C TO B E R 2018 Project of the Year N E W I N S T A L L A T I O N H O N O R A B L E M E N T I O N S R e h o b o t h B e a c h O u t f a l l I n s t a l l a t i o n The project consists of a new pump station and 24-in. HDPE force main, which are required to convey the treated efluent to the ocean outfall and to provide the head required to pump the efluent through diffus- ers located 6,000 ft offshore in wa- ter approximately 40 ft deep. The bids totaled $37,381,407. The ocean outfall bid was awarded to Manson Construction of Seattle, Washington, for $27,655,850 for 3,000 ft of 24-in. outfall installed via HDD and 3,000 of 24-in. pipeline and diffuser feet via marine open trench. The Outfall included the construction of 3,800 ft of the outfall using horizontal direc- tional drilling . Construction of the marine outfall commenced in No - vember 2017 after the review of the submittals. The contractor elected to complete the trenchless shore landing in a manner not speciically included in the bid documents. To reduce the need for prolonged barge-mounted marine support , the pilot hole would be advanced from land to within 50 ft from the sealoor exit , then enlarged by forward reaming and conditioning . A 30-in. diameter steel casing would then be pushed seaward along the en- tirety of the borehole to provide sta- bility. Challenges faced during casing insertion abandonment and re-drill - ing of 1,200 ft of the pilot hole, and intersection of the borehole. The com- bination of these events and decisions led to signiicant modiications to the contractor 's work plan, and provide several important lessons-learned for this alternative HDD construction method. The project was successfully completed and in service before June 30 in compliance with the consent de- cree. The project ribbon cutting was held on June 15, 2018. Project Owner: City of Rehoboth Beach Engineer: Brierley and GHD Contractor: Manson Construction and The HDD Company Products/Services: Performance Pipe, John Deere, American Augers and SlimDril Value of Trenchless Project (US$) $27,655,850 Congratulations to the Project Team of: City Of Rehoboth Beach GHD Brierley Associates Manson Construction The HDD Company The HDD Company Going to Greater Lengths™ 4525 Serrano Parkway, Suite 210 | El Dorado Hills, CA 95762 Main: 530.676.5705 |

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