Case Studies - Summer 2018

Case Studies - Summer 2018

Rehabilitation system seals out lift station infiltration

Cured-in-place conduit cuts infiltration

Problem: Grand Central Station, one of New York City’s most famous landmarks, has periodically launched repair programs and expansions since its origins in 1871. Expansions in the 21st century include the East Side Access project, connecting Long Island Rail Road to Grand Central Station. It was during this production that water infiltration was discovered in newly constructed conduits. The leaking conduit was located approximately 3/4 of a mile into the utility tunnel and 100 feet underground. It ran from the utility tunnel to a vault room and was encased in 6 feet of concrete.

Solution: Using Flow-Liner Systems cured-in-place conduit, a trenchless technology solution, a Flow-Liner Systems certified installer prepared and installed the lining system in the 4-inch electrical conduit, navigating several bends with ease. 

Result: The leaking electrical conduit was successfully lined without excavation or disruption to the progress of the project and effectively ceasing the water infiltration. 


Rehabilitation system seals out lift station infiltration

Problem: Located in Albert Lea, Minnesota, about 90 miles south of the Twin Cities, three lift stations needed rehabilitation for a variety of reasons. Water was penetrating through the mortar joints and concrete blocks, causing their coatings to delaminate. It was also seeping into the structures and contaminating electrical equipment. The infiltration was an unnecessary and ultimately costly problem for any city’s utility department.

These dry side-access hatchway lift stations built of concrete blocks required a system that would plug the leaks, as well as reseal and protect the surface from future damage.

Solution: The utility contacted Richard Hanson of Floorcoat Midwest. He recommended the CLADLINER System, which uses CLADSTOP 3 to address leaks and CLADLINER for sealing and resurfacing.

Fieldstone Services, the contractor for this project, began with proper surface preparation, using a 4-inch Metabo right-angle grinder fitted with a Joe Due shroud and vacuum attachment in order to remove all oil, dust, grease, dirt, loose rust and other foreign material to ensure adequate adhesion of the coatings.

After the surface preparation was complete, CLADSTOP 3 was mixed in small amounts and applied to the actively leaking areas. The remaining surfaces were sprayed with water from a small hand-held pump sprayer to provide a surface-saturated dry substrate. Lastly, CLADLINER was mixed and hand-troweled at a 1/4-inch thickness.

Result: Two weeks after the application, a follow-up inspection was conducted. It confirmed the success of CLADSTOP 3 in plugging the leaks and ultimately stopping the inflow and infiltration. The city’s proactive rehabilitation measures will ultimately improve the efficiency of the lift stations and prevent any further cracking or deterioration from taking place.


Monitoring system provides cost-effective solution

Problem: The Klamath Falls (Oregon) South Suburban Sanitary District encompasses roughly 10 square miles and includes more than 100 miles of sewer pipe and 1,000 manholes.

One of the key focus areas for South Suburban Sanitary District is management of I&I. “Monitoring of remote locations is an important part of our ongoing efforts to identify and combat I&I,” says Mike Fritschi, district manager. “We started monitoring in 2012 by installing four initial flow monitoring units for a cost of $50,000 but, when the need arose for expanding our efforts to more locations, we required a more flexible, easy-to-install, and cost-effective solution.”

Solution: To address the I&I monitoring expansion plan, the South Suburban Sanitary District turned to the use of the SmartCover Systems sewer monitoring system for several reasons. First, the cost per unit was significantly lower than previous solutions and the deployment flexibility was less invasive because SmartCover Systems does not require any confined-space entry for installation.

Also, based on calibration against the installed flow systems, the SmartCover Systems units proved to be as accurate as needed. In addition, the integrated SmartTrend software supported in-depth trend analysis and modeling to hone in on specific I&I issues.

Results: The SmartCover Systems units helped relatively small South Suburban Sanitary District staff target available resources to address real issues of concern regarding I&I.

“Using SmartCover Systems allowed us to quickly expand and improve our I&I monitoring processes at a much lower cost than the alternatives,” Fritschi says. “Deployment was quick and easy because no confined entry was required, which allowed us to get up and running fast without a lot of wasted staff time. Also, we get the side-benefit of real-time monitoring and alerts in more locations. In addition, the SmartCover tech support staff even tailored special software that allows us to aggregate flow information from multiple locations, thereby enabling more flexibility to analyze relationships between sites and to better understand the dynamics within the sub-basin.”



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