Utility turns to steam
by RICK NORTON, Associate Editor
Jan 14, 2013 | 1396 views | 0 0 comments | 4 4 recommendations | email to a friend | print
SCOPE 10 sewer project
AN INSITUFORM CREW fully inverts the CIPP (Cured-In-Place-Pipes) prior to the curing process which is done with steam. CIPP is a resin-enriched lining that the Cleveland Utilities contractor is using to seal leaks, cracks and other damage to existing sewer lines. CIPP is a critical stage in the SCOPE 10 sewer rehabilitation project that will keep the local utility busy for the next decade. Submitted Photo
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While their electric counterparts are lighting more and more new spaces throughout a growing community, the Cleveland Utilities Water Division is free-flowing into an array of its own water line redevelopment and wastewater restoration projects.

The biggest is the ongoing Strategic Commitment to Protect the Environment, a $30 million, 10-year wastewater project intended to massively curtail the amount of infiltration into CU’s existing sewer lines. The initiative is well under way and has reached the stage where a contractor — Insituform — is now using modern practices to seal broken, cracked or damaged sanitary sewer lines.

The intent of SCOPE 10, now in its second full year of operation, is to reduce sewage overflows that are worsened during periods of heavy rainfall by groundwater infiltration into cracked lines and damaged manholes. Greg Clark, who manages the SCOPE 10 initiative, recently updated members of the Cleveland Board of Public Utilities on the project’s progress.

SCOPE 10 won’t seal all leaks in the existing sanitary sewer system; however, it is expected to repair most major breaks that are being blamed for routine overflows and street flooding in Cleveland. Instead of automatically digging up miles of damaged lines and laying new ones, Insituform is installing resin-enriched linings inside existing pipes. The new lining is steam-sealed which, as described by Clark, results in a new pipe within an existing sewer pipe.

To date, Insituform has installed 12 of these Cured-in-Place-Pipes (CIPP), with the first coming on Dec. 11, Clark explained. Lateral and manhole rehabilitation are scheduled to begin within the next few weeks.

These resin-felt seals will be tested using water flow monitoring in order to assure the rehab is performing to expected standards, he noted.

This phase of SCOPE 10, recognized as the Basin 31-45 Rehabilitation, is taking place in South Cleveland near Smith Drive S.W. The area is roughly bordered by Smith Drive, Westover Drive and South Lee Highway. Areas also receiving this CIPP technique so far are short sections of Golf Drive S.W. and Fore Drive S.W., as well as Crest Drive S.W.

Craig Mullinax, vice president of CU’s Water Division, provided an overall update on the utility’s wastewater rehabilitation initiatives, all of which fall within the parameters of SCOPE 10. They include five ongoing projects, each at varying stages of development — from design and engineering to monitoring to the actual rehab work.

Mullinax said CU is hoping to be approved for $10 million in funding through the State Revolving Fund (SRF) that will be used in SCOPE 10. Application has been submitted to the Tennessee Department of Environment & Conservation (TDEC).

“We have received approval of the technical documents and had a promising meeting in late November concerning funding,” Mullinax told board members via a written report. “The SRF had requested additional financial information which was submitted and we are waiting on their response.”

In other Water Division developments:

- Mullinax reported rehabilitation work on the Weeks Drive water storage tank has been completed. This means nine CU tanks have been restored over the past four years. Only four tanks remain in the utility’s comprehensive project. Tank restoration features exterior and interior painting, as well as other maintenance as needed. Mullinax said the rehab project is putting Cleveland Utilities in full compliance for future inspections of its water storage system.

- CU crews and contractors are preparing to relocate 2,250 feet of 12-inch water main at Interstate 75 Exit 20 under contract with the Tennessee Department of Transportation. TDOT will pay for the relocations which are being done in conjunction with planned improvements to the Exit 20 interchange.

- CU is also preparing to relocate existing utilities for the new APD 40 interchange that will support the Spring Branch Industrial Park development. Construction will be completed under TDOT contract and paid by the state transportation agency.

- CU also is preparing to relocate more than 6,000 feet of water main as part of the planned roadway improvements on Benton Pike and Durkee Road. These projects, estimated to cost about $400,000, include the relocation of 1,900 feet of 20-inch water line, 2,925 feet of 8-inch line and 1,210 feet of 6-inch line. The project will be bid by CU and construction will be completed by a CU contractor prior to the start of TDOT’s roadway improvement work.

- Mullinax reported CU Water Division crews set 24 meters in November, compared to 25 in November 2011. Year to date, CU has set 146 water meters.