Infrastructure Strategy | 117
Sewer
In order to estimate what new sewer infrastructure would be required to serve Areas 3-6,
location and size of existing sewer infrastructure was reviewed. The majority of the area
surrounding the existing pump stations is partially developed. The existing pump stations
have a signifcant amount of capacity to support the large amount of economic expansion
planned in this study. Area 4 is already served with sewer by pump stations 235 & 248.
Areas 3 and 5 are partly served with existing pump stations 260 and 261. Additional pump
stations and the infrastructure to convey flows will be required to accommodate future
growth.
For estimating pipe lengths, diameters and number of connections within the residential
acreage, an existing adjacent subdivision was analyzed. Pipe length and size data was
collected from the City-provided GIS database and was equated to the acreage of the
existing subdivision. Pipe lengths outside of residential allotments and surrounding non-
residential areas were estimated based on the proposed roadway layout shown on the
Master Land Use Plan. The length of pipe within Retail, Office and Industrial areas was
not estimated due to the site- and process-specifc needs of individual properties. At this
stage of Corridor planning, exact pipe sizes along individual streets and parcels cannot be
determined. An average cost per linear foot of pipe was assumed.
Costs for sanitary pipe were taken from recent project bid tabulations and were
approximated to include lateral connections, manholes, and typical construction activities.
Pipe 10” and smaller is assumed to be PVC. Pipe 12” and larger is assumed to be ductile
iron. Approximate costs for pump stations were taken from recent project bid tabulations
within the Hampton Roads area.
Water
In order to estimate what new water infrastructure would be required to serve Areas 3-6,
location and size of existing water infrastructure was reviewed. The majority of Area 4
has already been developed and the existing water transmission lines already exist. Area
5 has an existing 16” ductile iron transmission main that extends down Scenic Parkway to
Drumcastle Lane. This transmission main can be extended to the proposed transmission
main that extends through the Corridor. The majority of Areas 3 and 6 do not have existing
water infrastructure and will require new transmission mains.
For cost estimating purposes, pipe sizes for the transmission mains within the various
Areas were estimated based on conveying the fre flow at the maximum allowable velocity
outlined in the Chesapeake Public Facilities Manual (PFM). Pipe lengths for transmission
mains were estimated based on approximate connection points to the existing water
infrastructure and proposed transmission main. Pipe lengths for distribution mains were
estimated based on the proposed roadway layout shown on the Master Land Use Plan. At
this stage of Corridor planning, exact pipe sizes along individual streets and parcels cannot
be determined. An average cost per linear foot of pipe was assumed.
For estimating pipe lengths, diameters and number of connections within the residential
area allotment, an existing adjacent subdivision was analyzed. Pipe length and size data
was collected from the City-provided GIS database and was equated to the acreage of the
existing subdivision. The length of pipe within Retail, Office and Industrial areas was not
estimated due to the site- and process-specifc needs of individual properties.
