San Diego County Water Authority will require a $125 million, 20 km-long x 4.2 m-diameter TBM tunnel from proposed San Vicente reservoir to carry 3 m-diameter steel pipeline to Metropolitan area of county. EIS complete and project under design for commencement 2002 using open or shielded TBM dependent upon the primary lining chosen. For contact purposes visit www.brierleyassociates.com June 2000.The San Diego County Water Authority has issued a notice inviting prequalification for the construction of the tunnelled pipeline referred to as the San Vicente to Second Aqueduct Pipeline project. The project shall transport water between the San Vicente Reservoir and the Water Authority's Second Aqueduct in an emergency and during normal operations. At the east end of the San Vicente to Second Aqueduct Pipeline, the pipeline will be connected to the San Vicente surge control facility. The east tunnel portal is approximately 3.2 km north of the City of Lakeside, and just south of San Vicente Dam. From this location, the tunnel and pipeline will extend westward below the Scripps Ranch community for about 17.7 km and connect with the Rancho Penasquitos pressure control and hydroelectric facility west of Interstate 15 near Mercy Road. The carrier pipeline is expected to be a 2.6 m finished inside diameter pipe installed within a 3.66 to 4.1 m-diameter excavated tunnel. The tunnel final lining shall consist of either welded steel pipe or reinforced concrete cylinder pipe. The final size of the tunnel and initial support systems are to be determined by the contractor. Design is scheduled to be completed in November 2004 and to be bid in January 2005. Construction is scheduled to start in May 2005 and to be completed by September 2008.The Statements of Prequalification Information shall be used to prequalify prospective bidders. The Water Authority intends to establish a list of qualified bidders from whom construction bids shall be accepted. Copies of the Notice Inviting Prequalification Information are available upon request from:Craig Balben, Contracting Technician, San Diego County Water Authority, 4677 Overland AvenueSan Diego, CA 92123. Tel. +1 8585226804. Project Fact Sheets and Order Forms are available at www.sdcwa.org 44/04.Traylor, in a joint venture with J.F. Shea, has been awarded the San Vicente Pipeline project located in San Diego County. This project, awarded for USD198 million while the construction cost estimate was USD161 million, includes construction of 17,454 m of 2.62 m ID pipeline inside an excavated tunnel with three shafts. The tunnel will be excavated using a combination of hard rock TBM, digger shields, and drill and blast methods. Ground support for the tunnel will be precast concrete segments, rock bolts, shotcrete when necessary, steel fibre-reinforced shotcrete, steel ribs and pipe umbrellas when necessary. Construction management and assistance in project management by Parsons Engineering. The pipeline project is scheduled for completion in 2008. Visit www.traylor.com, http://jfshea.com, www.parsons.com and www.sdcwa.org 35/05.Traylor-Shea battling hard conglomerate using its CTS shield on final 6.4 km drive from Slaughterhouse shaft, having completed just 2.25 km since April, 2007. 150 m/month reported currently being achieved in softer ground. 2.6 m ID steel carrier pipe under installation in completed sections of tunnel. For project history visit tunnelbuilder archive us/47 and www.sdcwa.org/infra/esp-sanvicente.phtml. 08/09.
