Underground Solutions provides infrastructure technologies for water and sewer applications. UGSI's Fusible PVC® products contain a proprietary PVC formulation that, when combined with UGSI's patented fusion process, results in a monolithic, fully-restrained, gasket-free, leak-free piping system. Fusible C-900® and Fusible C-905® both comply with AWWA C900 and C905 respectively and are certified to NSF 61.

Monday, October 5, 2015

King County, Wash., Takes on Challenging Project to Control CSOs


Horizontal directional drilling (HDD) projects continue to progress into more and more challenging applications. ‘At-grade’ HDD techniques or drills where the profile is maintained at a constant grade to allow for gravity flow applications are a particularly challenging application — especially as pipe sizes get larger and alignment lengths get longer.

To further add to the complexity of the project, a series of three horizontal curves were also necessary to connect the entry and exit locations and remain primarily within the available public right of way.

One recent example of HDD technology and a strong project team overcoming a unique set of technical challenges, including an ‘at-grade’ application, occurred in Seattle. A 32-in. outer diameter (OD) gravity sewer pipeline was installed using HDD methods for King County to reduce combined sewer overflows (CSO) into Elliott Bay. This large design-bid-build project included a 3,151-ft HDD that required a grade of 1.8 percent through a glacial bluff to convey flows into a 1.5 million-gal retention storage tank.

The new pipeline augments an older section of King County’s wastewater system, which was comprised of a single pipeline to carry both sewage and stormwater runoff. This combined sewer collection is routed to a wastewater treatment plant that treats the waste stream; however, during periods of heavy rainfall, the pipeline can easily surcharge, leading to a CSO into Puget Sound.

King County implemented this project to meet the requirements of the Washington State Standard and to reduce the frequency of CSOs into Puget Sound, which can pose a risk to public health and the environment. Currently King County has reduced CSOs by 90 percent countywide, and succeeded in keeping more than 2.3 billion gals of sewage out of local waterways.

Read the full story at http://trenchlessonline.com

KRG Utility Completes Static Pipe Bursting Project In Wilmington, N.C.

In 2007, the U.S. Environmental Protection Agency (U.S. EPA) issued a Special Order of Consent (SOC) with the state of North Carolina regarding a series of sanitary sewer overflows that occurred in the city of Wilmington. That SOC led to several challenging pipe bursting projects facilitated by trenchless contractorKRG Utility Inc., Lenoir, N.C.

Since that time, the management of the wastewater treatment systems in the City of Wilmington and New Hanover County has been taken over by the Cape Fear Public Utility Authority (CFPUA). The CFPUA, now responsible for those sewer systems, entered into a consent decree with the U.S. EPA in 2013, resolving the claims by the EPA regarding overflows in the City of Wilmington and New Hanover County’s systems.

Read the full story at http://trenchlessonline.com/
KRG Utility used a Grundoburst 1900G from TT Technologies to burst and replace the ductile iron force sewer main with Fusible PVC pipe.

Friday, April 17, 2015

City of Lawrence, Kansas Installs 36-inch Fusible PVC® Pipe for Critical Water Transmission Main Crossing the Kansas River

Home to 90,000 residents and the University of Kansas, the City of Lawrence has been providing drinking water to the city and its surrounding areas for over 100 years. The city currently has two water treatment plants (Kaw WTP and Clinton WTP), six storage sites, 19 high service pumps, and a distribution system consisting of approximately 460 miles of pipe ranging in size from 2-inch to 24-inch that serves an area of 30 square miles.

The KAW Water Treatment Plant, originally built in 1917, is located on the south side of the Kansas River and draws water from the river and six alluvial wells. The treatment plant is well situated given that the majority of Lawrence is located south of the river, including the downtown area and the University of Kansas. The portion of the city located on the north side of the Kansas River (North Lawrence) received all of its treated drinking water via a single transmission line affixed to the Vermont Street bridges. The aging transmission main presented a major challenge to the City’s ability to provide reliable water service to North Lawrence.

In order to provide another feed to North Lawrence, and provide additional supply for future growth, a second transmission main crossing the Kansas River was planned. Early in the preliminary design phase it was determined that horizontal directional drill (HDD) installation was the preferred method for crossing the Kansas River. An integral part of the preliminary engineering design included a material selection study. According to Jeff Heidrick of Burns and McDonnell, “The City of Lawrence liked the idea of installing a material that would not be susceptible to corrosion. Once it was demonstrated that Fusible PVC® pipe could meet the short-term installation stresses, long-term operating conditions, and was cost competitive with other options, it was selected as the preferred material.” Not only was Fusible PVC® pipe utilized in the HDD sections, it was also used in the open-cut sections to provide a fully-restrained pipe system for this critical section of infrastructure.

The project was competitively bid in December 2013. Garney Construction was the selected bidder and was awarded the project. Garney had completed multiple projects utilizing Fusible PVC® pipe, including the O’Connell Road Water Line Project in Lawrence that consisted of 9,400 LF of 16-inch and 800 LF of 12-inch Fusible PVC® pipe.

Garney subcontracted Environmental Crossings, Inc. (ECI) to perform the directional drills on the project. ECI mobilized to the job in March 2014 to start on the Kansas River drill. The alignment consisted of drilling through sandy clays with some gravels in the upper elevations and sandstone rock at the deeper elevations of the river crossing. While drilling sandstone can be time consuming and hard on down-hole drill equipment, it provides a stable borehole for pullback. The 2,400 LF Kansas River drill was pulled in over an 18-hour period on May 22, 2014. After the remaining two drill sections were installed, Garney began the open-cut portion of the job.

In total, 6,800 feet of 36-inch DR21 Fusible C-905® pipe was installed on the project, including three HDDs (2,400 LF, 1,400 LF, and 800 LF), 2,000 LF of open-cut, and approximately 200 LF of pipe installed inside a steel casing. The entire line was pressure tested and brought into service in January 2015, providing the City of Lawrence much needed redundancy and additional capacity within its system.

Monday, March 9, 2015

Fusible PVC® Pipe a Growing Solution for Water & Wastewater Infrastructure at U.S. Military Bases

U.S. Military Engineers face unique challenges when designing and constructing infrastructure projects on military bases. These challenges include contaminated soils, crowded or unknown underground utilities, and limited budgets. Military Engineers have found a product in Fusible PVC® pipe that can provide unique solutions, savings, and long service life for both new installations and rehabilitation projects. Fusible PVC® pipe meets these objectives by combining material familiarity, chemical resistance, and long service life in a wide range of installation methods including both trenchless and traditional open-cut excavation.

Read the full story at: