HDD with Fusible PVC® pipe saves Commission $200,000
Overview
The Howard County Regional Water Commission (HCRWC) was formed in April 2008 with the intent of being a wholesale water provider for the City of New Franklin, the City of Fayette and Howard County CPWSD #1. MECO Engineering has been involved with HCRWC since day one in an effort to assist with design and funding of the required infrastructure. The necessary infrastructure consisted of an alluvial well field, water treatment plant, water tower and distribution mains.
The distribution system design consisted of approximately 68,000 feet of 12-inch waterline, 1,200 feet of 10-inch waterline and 1,200 feet of 6-inch waterline with the majority of the pipe to be installed by conventional open-cut installation. However, there was still a significant amount of the 12-inch waterline that could not be installed by conventional open-cut construction
based on environmental concerns such as creek crossings or as a result of private property disturbance agreements tied to the issuance of easements. As a result, approximately 8,800 feet of the 12-inch line would need to be installed using horizontal
directional drilling (HDD) installation methodology.
The original plans and specifications included HDPE pipe for the HDD portions of the job. However, during the bid process, Fusible PVC® pipe was allowed as an alternate material for the HDD sections. As a benefit, Fusible PVC® pipe would be able to match the bell-and-spigot PVC pipe being installed in the open cut portions of the job, while the HDPE pipe would need to be upsized in order to provide the same inside diameter. Ultimately the project allowed for two material options in the HDD portion of the job, 12-inch DR 21 Fusible PVC® pipe and 14-inch DR 9 HDPE pipe.
Bids were opened on July 8, 2015 and based on utilizing Fusible PVC® pipe for the HDD sections, C&S Construction out of New London, Missouri was the low bidder. In fact, their bid provided a $200,000 savings due to installing Fusible PVC® pipe instead of the HDPE pipe that was originally specified.
The distribution system portion of the work lasted approximately eight months with all of the Fusible PVC® pipe being installed and tested without any issues.
“We have installed Fusible PVC® pipe on multiple jobs. We really like the way it performs. For this project it allowed us to drill a smaller hole when compared to the HDPE option. Since most of these drills occurred in rock, a smaller hole provides substantial savings of both time and money.” Clinton Ray, Owner Ray’s Construction