Nassau County Department of Public Works, Cedar Creek- Grit Removal Facility Improvements

Posted on July 9, 2015

Client: Nassau County Department of Public Works
Location: Cedar Creek Water Pollution Control Plant
Project Period: 2010- Present
D&B Project Manager: Joseph M. Marturano
Project Cost: $5,000,000

Major Components

  • Grit Removal Facility
  • Odor Control
  • Electrical Distribution System
  • Instrumentation
  • Lighting
  • Construction Management
  • CPM Scheduling
  • Start-Up Services

Project Description

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The Cedar Creek Water Pollution Control Plant (WPCP) is a secondary treatment facility, which utilizes the activated sludge process. It serves the southeastern portion of Nassau County and is located in Wantagh, New York.

The plant primarily receives domestic sewage with a small portion (1.0%) attributed to industrial sources. The permitted plant capacity is 72 mgd (maximum monthly flow). Secondary sludge is thickened by dissolved air flotation, blended with primary sludge and anaerobically digested for stabilization. The sludge is subsequently dewatered to approximately twenty percent solids using belt filter presses and hauled by trucks for additional processing out-of-state. The final plant effluent is discharged into Atlantic Ocean.

This project is for the design and construction of improved grit removal facilities at the Cedar Creek WPCP.

D&B Project Responsibilities

D&B project responsibilities for Nassau County Department of Public Works include:

  • Design improvements to the grit removal facilities to handle peak flow of 150 mgd, odor control systems, instrumentation and control, and heating and ventilation system improvements.
  • Preparation of Technical Design Report.
  • Preparation of Plans and Specifications.
  • Construction Management Services including resident engineering, shop drawings, preparation of change orders, and review as-built drawings.
  • Facility startup, staffing and training services.
  • Preparation of an O&M Manual.

D&B’s project responsibilities included design of the following systems:

Power Distribution

The design includes improvements to the 4160 and 480 volt distribution system serving the Grit Removal Facility. The single 4160-480/277 volt, 500 kva unit substation transformer is being replaced with dual 750 kva transformers, each served by a separate 4160 volt primary switch, and main-tie-main 480/277 volt switchgear to provided redundancy.

The design also includes replacement of 480/277 volt motor control centers, which include a significant amount of controls.


LED lighting and emergency lighting was provided for the Grit Removal Facility, approximately 12,500 square feet. The majority of this space is a Class I, Division 1 explosion hazard area and corrosive.

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