Killy Hills and Slocomb Road Sanitary Sewer Extension

In 1999, residents of the Kelly Hills area approached the Cumberland County Board of Commissioners requesting assistance in having sewer installed to serve their neighborhood. Numerous septic tank problems and failures were occurring in the area. Kelly Hills subdivision was located in Sewershed 11 of the North Fayetteville Sewer Study. Moorman, Kizer & Reitzel, Inc. was selected to perform an engineering study and assessment as outlined:

Sewer Flow Projections

Using the North Fayetteville Sewer Study and the guidelines as set forth by the State of North Carolina, the sewer flows were projected for the different areas within the study boundaries. Anticipated sewer flows were calculated based upon the 2010 Land Use Zoning, considering the projected "built out" development density and type. Estimated peak flows were established to size the lift station needed to support the area.

Topographic and soils information was then overlaid with the existing parcel and 2010 Land Use Zoning in order to project future sewer flows and the area of service. Using this compiled information four different sewer options and service areas were analyzed .

Sewer System Improvements

With a GIS model, the ultimate sewer flows were computed and an analysis was performed to determine the type and size of sewer system improvement needed to serve different areas around the Kelly Hills Subdivision. The main objective was to provide a feasible alternative to serve Kelly Hills, and with some modifications a larger area maybe served, increasing the cost effectiveness of the design. Because of the dispersed nature of the existing development and poor soils, serving a large area without extensive front-end cost was difficult. Although, considering the distance from Kelly Hills to an existing sewer outlet point, any extension to serve the area will be expensive.

An analysis of the topography identified the potential point source locations were the sewer would be collected. The point source locations were reviewed for common locations within the study area that would permit a single collection point. By identifying these locations, potential sewer system improvements that could result in maximum benefits for a larger service area was evaluated. In making these determinations, the topographic characteristics of the area were used to ascertain the potential capacity needs and sewer system layout options available.

The parameters considered in this analysis consisted of (1) determining the best collection points, (2) the most cost beneficial location and alignment for the proposed sewer mains and outfalls and (3) the corresponding siting of potential lift stations and force mains.

Moorman, Kizer & Reitzel, Inc. has attempted to address the concerns, weigh the alternatives, and propose a plan of action for the possible correction of the problem. Many options were considered to insure that the presented alternatives were the most cost effective and beneficial way to address the sewer needs in the study area. Appreciating the need to have accurate budget information, MK&R has researched the applicable cost in an effort to provide a solid benchmark for the construction cost.