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Bidjugde
JOB
Nob Hill Improvements
BID DATE
07/8/15 - 2:00
AGENCY
San Diego County Water Authority
ESTIMATE
$12,800,000
SCOPE
The work generally consists of the construction of a tunneled and trenched pipeline in the Scripps Ranch Community of the City of San Diego, California. The pipeline will convey untreated water along the Second San Diego Aqueduct from a connection with Pipelines 3 and 4 at approximately Pipeline 3 Stations 3827+86.66 to 3836+74.45 and Pipeline 4 Stations 3827+94.08 to 3836+61.10 and all other appurtenant work as required by the Contract Documents. The alignment is divided into three reaches for description and payment purposes. Major elements of the Nob Hill Improvements Project include: • Constructing approximately 1,600 lineal feet of permanent access road from Scripps Lake Drive for use to construct the tunnel and pipeline under this contract and for future operation and maintenance activities at various appurtenant structures, and paving approximately 230 lineal feet of existing access road to existing appurtenant structures. • Constructing Reach 1 at the south portal for tunneling that is approximately 136 feet long. Portions of the existing Pipeline 3, a 72 inch inside diameter prestressed concrete cylinder pipe with and without welded steel lining, will need to be demolished, while other portions will need to be supported and protected in place in order to construct the portal. • Constructing Reach 2, which is required to be tunneled over approximately 458 lineal feet to install 98 inch outside diameter welded steel pipe. • Constructing Reach 3 at the north portal that is approximately 281 feet long by combination of trenching and tunneling. Portions of the existing Pipeline 3, a 72 inch ID prestressed concrete cylinder pipe with and without welded steel lining, will need to be demolished, while other portions will need to be supported and protected in place in order to construct the portal. • Installing approximately 876 feet of 98 inch OD and 69 inch OD welded steel pipe within the three tunnel and portal reaches and connecting to the existing 69 inch OD welded steel liner inside the existing 72 inch ID prestressed concrete cylinder pipe at the north and south ends of Pipeline 3. • Constructing approximately 125 lineal feet of trenched 69 inch OD welded steel pipe to connect Pipeline 4, a 72 inch ID prestressed concrete cylinder pipe with 69 inch OD welded steel lining, to the 98 inch OD welded steel pipeline. • Constructing a 16 inch air release and air vacuum valve and structure at the south portal at Station 3836+19.57. • Modifying an existing 4 inch manual air release valve at Pipeline 3 Station 3860+03.44 and installing a 10 inch air release and air vacuum valve and structure. • Constructing a coordinated connection to Pipeline 4 at the north and south portals, including removal of Bulkhead No. 1 at Pipeline 4 Station 3798+85 and Bulkhead No. 5 at Pipeline 3 Station 3868+34. • Demolishing existing air release and air vacuum mcha@sdcwa.org melissa cha

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