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Formed in 1918, the Coachella Valley Water District (CVWD) is located in the desert of southern California and covers an area of approximately 1,000 square miles from the San Gorgonio Pass to the Salton Sea; mostly within the Coachella Valley in Riverside County. CVWD provides potable, irrigation, recycled, and waste water services to more than 105,000 businesses and residences.
In order to expand service to its customers, CVWD undertook the construction of the Avenue 60 Domestic Water Transmission Main Project through Thermal. Completion of the pipeline required crossing a storm water channel that bisects the proposed alignment of the new main. Due to the high water table adjacent to the storm water channel, CVWD's standard installation method - using casing pipe installed via jack & bore followed by sliplining with restrained joint ductile iron carrier pipe - would have required significant excavation, dewatering, and shoring. In order to avoid the additional costs associated with the jack & bore installation approach, CVWD evaluated the installation of Fusible PVC® pipe by horizontal directional drill (HDD) as an alternative. The evaluation led CVWD to add the installation of Fusible PVC® pipe via HDD to the project documents as an alternate bid item.
|Pipeline Details and Project Summary|
|Project:||Avenue 60 Domestic Water Transmission Main|
|Pipe Size:||24" DR18 Fusible PVC®|
|Installation:||Horizontal Directional Drill|
|Owner:||Coachella Valley Water District|
|Engineer:||RCE Consultants, Inc.|
|Contactor:||Jones Brothers, Inc. / Riverside Directional Boring (HDD Sub)|
Once bids were tallied, the average difference between the two methods of installation was greater than $750,000 in favor of Fusible PVC® pipe installed via HDD. The low bidder, Jones Brothers, Inc. of Coachella, California, was awarded the project in June 2012; with fusion services commencing on September 12th and completing two days later. The pipe was successfully pulled under the storm water channel on September 20th by Riverside Directional Boring.
CVWD's Brian Fogg stated: "Due to the success of this installation, the District is looking to utilize the combination of HDD and Fusible PVC® for future crossings that would otherwise require costly shoring and dewatering to accomplish with more traditional installation methods."