HomeMy WebLinkAboutSCWA Well Field Const Cost Comparison 2002
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Suffolk County Water Authority
Well Field Construction Cost Comparison
Southold vs. Areas West ofShinnecock Canal
Revised 9/6/02
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WelJ Field Cost Comparison
The cost of constructing wells and well fields varies within Suffolk County. The
cost variances are not due to changes in labor costs or any of the traditional components
of construction, rather they are due to the differences in individual well sizes that may be
constructed due to local hydro-geological conditions. As a result of these differences, the
maximum capacity of a well field will be larger or smaller depending upon the location.
In the case of Southold, it has been found through experience that it is not feasible
to construct the 1300 GPM well so typically found in areas of the County west of the
Shinecock canal. Instead, the wells constructed in Southold need to be constructed in
smaller capacities so as to minimize the impact on surrounding wetlands and to prevent
vertical or horizontal salt water intrusion. The net result of these differences is a dramatic
difference in the capital cost per GPM of well field.
Attached are two recent estimates that were prepared for well field construction in
these two areas. A summary of the information is as follows:
Typical Southold Well Field:
Capacity:
Aprrox. Cost:
Capital Cost/GPM:
200 GPM
$650,000.00 (without generator)
$3250/GPM
Typical Western Suffolk Well field:
Capacity:
Approx Cost:
Capital CostlGPM:
3900 GPM
$1,900,000.00 (2 Additional wells@ $400K each)
$487/GPM
From the above, we can see that the installed capital cost per GPM for a well field
in Southold is over six times the cost of one constructed in the western portions of
Suffolk County.