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| Los Altos Hills Fire Flow Improvement Project (2004-2005) |
| The Los Altos Hills Fire District and California Water Service Company needed to upgrade fire flow delivery capacity in a section of Los Altos Hills, CA. WVC’s design-build process was used to construct a new pump station with 4 new booster pumps, 15,000 gallon hydropneumatic tank, motor control center, and a SCADA system on an existing pump station site with two at-grade storage tanks. The demanding schedule required hydraulic parameters and pump selection to occur early in the project to be able to construct prior to the high demand, high fire danger period in summer. Equally critical was the construction of two phases of transmission pipeline totaling 5000 lf of 16-inch, 900 lf of 12-inch and 1100 lf of 8-inch ductile iron pipe to provide necessary fire flow delivery to fringe areas in the system. |
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| Lexington Reservoir Pipeline Replacement (2006) |
| San Jose Water Company needed to replace a critical component of their raw water delivery pipeline to the Montevina Treatment Plant. WVC was low bidder and was awarded the project in early 2006. The existing 30-inch steel pipeline originally constructed in 1954 was failing and a section near Lenihan Dam had to be relocated because of another project. The replacement project called for installation of 8,000 lf of 1000 mm (39.37-inch) HDPE, 1,620 lf of 36-inch ductile iron pipe and 540 lf of 24-inch HDPE. The entire reach of HDPE pipe needed to be installed by the “float-and-sink” method to place the pipeline at the bottom of the reservoir. |
| Essentially, the entire HDPE pipe was fused, floated on the reservoir surface and specially-designed pre-cast concrete ballast blocks were placed on the positively-buoyant pipeline at regular intervals. Water was then introduced in a controlled fashion with a “pig” separating water from air inside the pipeline. With positive water pressure on one side of the pig and lesser air pressure on the other, the “pig” advanced and water-filled pipe sank and came to rest on the bottom. During the operation, marine surveyors directed the alignment and position to fall within the design corridor. This process continued until the entire pipeline was in the design corridor. |
| WVC had to coordinate and manage critical items including more than 400 anchor blocks with stainless steel straps, on-time pipe/fusion production, environmental mitigation, installation/operations and safety plans, public outreach/community coordination and engineering analyses of pipe stresses during installation. The final stage included removal of most of the existing pipeline and grouting/abandonment of a section in existing Lenihan Dam per State Division of Dam Safety (DSOD) requirements. |
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| MONTEVINA |
| West Valley was asked to replace an undersized and failing 30-inch treated water transmission pipeline in Los Gatos, CA. Using our design-build process, the Montevina Transmission Pipeline was envisioned as a multiphase project to help normalize water delivery requirements and meet budget requirements. |
| The entire replacement project required approximately 10,000 lf of new 42-inch steel pipeline to be constructed within a generally predetermined alignment between and parallel to Los Gatos Creek and CA State Highway 17 within a community trail, north and downstream from Lexington Reservoir/Lenihan Dam in Los Gatos, California. West Valley Construction successfully completed the phased projects in three consecutive years, meeting both client and community requirements. |
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| ALMA BRIDGE ROAD |
| The Alma Bridge Road project is Phase two of West Valley Construction’s replacement of a 50 year old 30” steel pipe line for San Jose Water. Phase 1 consisted of 2500 feet of 36” ductile Iron main, and phase 2 has 1680 feet of 36”. Phase 3 will have us install 8000 feet of 1000MM HDPE pipe by a float and sink method in the bottom of Lexington Reservoir starting in June of 2006. |
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| BAKERSFIELD WATER TREATMENT PLANT |
| Working in partnership with California Water Service Company and Dillingham Construction, West Valley Construction performed all of the site rough grading for Cal Water's new water treatment facility in Bakersfield, CA. We furnished and installed the buried yard piping and appurtenances for pretreated water, finished water, backwash collection, residual decant recovery, fire protection and storm water drainage. The plant successfully enabled California Water Service Company to supply a significant area in Bakersfield with water from the Kern River, contributing strongly to the economic growth of the region. |
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| We welcome your call or email regarding your project. You’ll find contact information on the nearest West Valley office nearest you on the contact page. |
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