North Gratiot Interceptor Drain

Client: Macomb County Public Works Office
Location: Chesterfield Township, Michigan

Project Duration: 5 Months

Project Cost: $1,200,000.00
Key Personnel: Sermed K. Saif, PE

Background

The North Gratiot Interceptor (NGI) – Phase 3 & 4 Drain project is the last segment of a 6-phase sewer that provides sanitary service to Lenox Township, Chesterfield, and the Village of New Haven.

Location

The sewer is designed along the east side of Gratiot Avenue from Concordia Boulevard (25.5 Mile Road) to 26 Mile Road and consists of approximately 2,700 lineal feet of 36” diameter sewer pipe.

Scope

Huron provided construction observation, administration, shop drawing reviews, value engineering, and contract administration.

Special Features

The project featured open-cut excavation at depths of 30 FT or more below existing grade, through challenging soil types of very dense hard pan. The design constraints included wetland and high pressure gas main crossings.

Due to soil conditions and depth, an alternate Pre-Bed concrete pipe was selected that offered an enhanced structural design and faster production rate.

The project also retained a strict in-service completion milestone that was met in order to start the rehab project of an existing 27” sanitary sewer that was federally funded.

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