Combined Sewer Separation Program - Middletown, CT

Since 1986 Cardinal Engineering has assisted the City of Middletown in implementing their city-wide Combined Sewer Separation Program to eliminate overflows into the Connecticut River.

Cardinal has designed and provided construction contract administration and resident engineering services for 12 combined sewer separation projects with a total construction cost of over $25 million. The design included 53,000 linear feet of sanitary sewer replacement, 36,000 linear feet of new storm sewers and 10,000 linear feet of sewer lining. In addition, this project included the separation of hundreds of roof leaders from the combined sewer and reconnecting to the new storm sewer, and complete reconstruction of six miles of city streets.

North End - Northern District

A portion of this project is located in a low lying industrial area subject to flooding from the Connecticut River. Two separate drainage systems were constructed to protect the low area from flooding. The area above flood level is served by a system with watertight manholes and no inlets below flood stage. 1,500 linear feet of 60" diameter interceptor discharging to the Connecticut River was constructed to drain this area. Installation required jacking under the Central Connecticut Railroad.

The low area has a separate 48" outfall and is protected from flooding by a flap gate. A 2,000 gpm stormwater pump station drains the low area during rain events that occur while the river is above flood stage. Cardinal Engineering designed an upgrade of the Miller street. Pump Station and rehabilitation of 1,000 linear feet of 48" brick sewer as part of this project. Final plans included replacement of 12,000 linear feet of sanitary sewers and installation of 16,000 linear feet of storm sewers ranging in size from 15" to 60" in diameter and complete reconstruction of three miles of city streets.

Washington Street, Main Street, and Grand Street Sub Areas

This project is located in the commercial district in downtown Middletown. Approximately one mile of the project is located on Connecticut Route 66 and Main Street Middletown. This project included SSES of 10,000 linear feet of combined sewers, building survey and design of separation measures for 300 residential and commercial buildings.

Final design consisted of replacing 10,000 linear feet of combined sewers with new sanitary sewers, constructing of 9,200 linear feet of storm sewers, and rehabilitating 2,000 linear feet of combined sewers. The project included constructing a new 48" storm sewer outfall by jacking under Connecticut Route 9 and the Central Connecticut Railroad. Complete reconstruction of one mile of Grand St. and adjacent streets was also included.

Group 7, Area 3, Contract 18

Final design included 4,500 linear feet of sanitary sewers, 4,000 linear feet of storm sewers, connecting roof leaders from 60 houses to the new storm sewers, and 4,500 linear feet of roadway reconstruction.

Group 7, Area 3, Contract 12

Final design included 2,500 linear feet of sanitary sewers, 2,900 linear feet of storm sewers, ranging in size from 15" to 42", connecting roof leaders from 70 houses to the new storm sewers, and 3,000 linear feet of roadway reconstruction.

CSO Contract 15

In 2005, Cardinal Engineering Associates completed a Sewer System Evaluation Study of the Group 7, Area 12 sub-basin. The survey included the cleaning and closed circuit television inspection of 25,000 linear feet of sanitary sewers, inspection of approximately 70 manholes and smoke testing of 10,000 linear feet of sewers to locate private inflow sources.

The final design included replacement of 7,000 linear feet and rehabilitation of approximately 13,000 linear feet of sewers. Cardinal Engineering also designed roadway improvements within the project area and provided resident engineering and contract administration.

Cardinal Engineering also provided design and inspection for two miles of milling and overlay and one mile of complete roadway reconstruction as part of this project.

Group 7, Area 3, Contract 19A

This project consists of television and manhole inspection, condition assessment of 3,600 linear feet of combined sewers, cost comparison of rehabilitation and replacement methods, field survey to identify all inflow sources on private property, designing separation measures for 60 residential buildings, final construction plans and specifications for 2,500 linear feet of sanitary sewers, 2,200 linear feet of storm sewers and 1,000 linear feet of lining. This project included complete reconstruction of 4,000 linear feet of city streets with new curbing, sidewalks, driveways and full-depth pavement reconstruction and the replacement of 3,000 linear feet of water and 3,000 linear feet of gas mains.

CSO Contract 19B

This project consists of television inspection, manhole inspection, condition assessment of 3,100 linear feet of combined sewers, cost comparison of rehabilitation and replacement methods, field survey to identify all inflow sources on private property, design of separation measures for over 100 residential buildings and final construction plans and specifications for 3,700 linear feet of sanitary sewers and 1,200 linear feet of storm sewers. The project also includes replaceing 2,000 linear feet of water mains and 3,500 linear feet of gas mains, and complete reconstruction of 4,000 linear feet of city streets.

 

 

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