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    Home Projects Hampstead Influent Gravity Sewer

    Hampstead Influent Gravity Sewer

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    Location Hampstead, MD


    Client Carroll County, Department of Public Works, Bureau of Utilities


    Costs $1,139,758


    Date of Completion December 2017


    Services #Construction Services #Water / Wastewater Engineering


    Sectors #Government #Infrastructure #Water Systems

    As part of a comprehensive set of improvements to the Hampstead Wastewater Treatment Plant (WWTP) in Carroll County, MD, George, Miles, & Buhr, LLC (GMB) was tasked by the Carroll County Bureau of Utilities to develop a plan for shifting as much flow as possible from being pumped to the WWTP to instead flow via gravity in order to reduce costs for replacing the existing pump station as well as to reduce on-going Operation & Maintenance costs.

    By following a route through existing County-owned property, a nearby farm, and along Lower Beckleysville Road / Maryland Route 88, GMB was able to identify a route that would shift approximately 75% of the flow to the WWTP to a new gravity interceptor that would preclude the need for re-pumping.

    GMB then developed Contract Documents (plans and specifications) for construction of over 5,000 LF of 15-inch and 100 LF of 8-inch diameter sanitary sewer to flow from South Main Street / Maryland Business Route 30 to the WWTP.

    In order to expedite completion of the new interceptor near the WWTP, the work was divided into two (2) separate contracts:  Hampstead Wastewater Treatment Plant Influent Gravity Sewer, Phase 1 – Solar Panel Field and Phase 2 – Cole Farm and Lower Beckleysville Road.

    Project-specific features included two (2) jack and bore crossings of Lower Beckleysville Road (SHA) and re-configuring flow channels in two (2) existing manholes in order to re-direct additional flows to the new gravity interceptor.

    In addition, the work also included erosion & sediment control measures, maintenance of traffic, and repair of the westbound shoulder of Lower Beckleysville Road where the new interceptor is located.

    Additional services included assisting the County with bidding, as well as construction phase services such as reviewing shop drawings / submittals, responding to Requests For Information (RFIs), reviewing Proposed Change Orders (PCOs), and reviewing pay requests from the contractor.

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