Sewer Repair Contract & In-Place Rehabilitation
Start Date: 01 Feb 08
End Date: 01 Dec 09
Status: In Progress
Design/Build Services for East Side City of Detroit Sewer Repairs Contract for Inspection and In-Place Rehabilitation of Existing Circular and Non-Circular Sewers. DWS-865 is a Design Build project for inspection and in place rehabilitation of existing sewers on the east side of Detroit. The intent of this project is complete labor, materials and equipment to fully perform the work of television inspection cleaning and rehabilitation/lining of circular and non circular storm and sanitary sewer and water main lines 8” thru 120” by using relining methods of cured in place pipe (CIPP), slip lining or pipe bursting conforming to the requirements of the current standard specification for lining sewers and water mains.
Lakeshore’s personnel, have substantial work experience with DWSD, performing sewer and manhole rehabilitation work. The scope includes complete cleaning and television inspection of sewers including, removing and disposing of sludge and debris, and root intrusion from pipelines, by-pass pumping (up to 4,000 gpm) as required, traffic control including barricading and required point repairs. The initial phase involves cleaning and removal of debris from inside the sewer by using High Pressure Water Jet Equipment capable of producing a minimum of 120 gallons per minute. In most cases, special cleaning is also required in order to remove excessive root intrusions and mineral deposits. Excessive amounts of debris are removed by using specialized cutting equipment. After the sewer is cleaned a television camera records the condition of the sewers interior, which is stored on a DVD.
The second phase of work involves video review of the televised sewers to determine if point repairs or rehabilitation with CIPP is required. Next, the lining design thickness is established for the sewers requiring rehabilitation. The location of the point repairs are also documented and pinpointed on the corresponding sewer section maps.
Rehabilitation of the sewers is the third phase. Point repairs, which involve excavation of collapsed sewers and installation of new manholes, are initiated. Concurrently, sewers not requiring point repairs are rehabilitated with CIPP lining. Traffic control including barricading, is implemented when rehabilitation is performed near roadways. Following rehabilitation, a complete post-video inspection is performed for quality control. Work areas are restored including paved and unpaved areas. Street pavements are being replaced to the bottom of the existing pavement with a minimum of 10-inch of reinforced concrete and asphalt pavement with a minimum of 2-inch depth. Green belts are restored with topsoil and grass seed or sod grassing. Sewer section maps are enhanced to show rehabilitated areas and submitted to the owner as-built drawings.
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