Chaucer-CS 960409 MEMORANDUM (~
To: Jim Witt, City Manager
From: Kenneth M. Griffin, P.E., ACM/City Engineer ~
RE: Chaucer Estates Pond
Date: April 9, 1996
As we recently discussed, I have attempted to develop a rough cost estimate on what it would
take to remove siltation from the Chaucer Estates Pond. To make my best guess on the amount
of siltation in the pond, I reviewed the information provided by Patton, Burke and Thompson
Engineering Consultants on the samples. The two samples on the western end of the pond
showed anywhere from 11 to 14 inches of siltation. The one sample on the far east side of the
pond showed approximately 24 inches of siltation and the additional sample taken near the outfall
in the middle of the pond showed approximately 32 inches of siltation. Using those amounts of
siltation, I estimated that approximately 50% of the pond area had 1 foot of siltation, 30% of
the pond area had 2 feet of siltation and 20% of the pond area had 2 1/2 feet of siltation. For
the surface area of the pond, I used the standing water surface area which is about 32,600 square
feet. Using those estimates, I came up with approximately 1950 cubic yards (CY) of silt to be
removed.
To arrive at the cost to remove the siltation, I reviewed estimates of cost generated for removal
of silt from the Duck Pond. Those ranged anywhere from $12 to $18 per cubic yard. The basic
difference between this and the Duck Pond is that the Duck Pond allowed areas for the
contractor to remove the dirt and stock pile it on-site to be dried and/or removed at a later date.
The Chaucer Estates pond does not allow that opportunity. Therefore, I used $20 per CY for
the silt removal. Using those numbers, I estimate the cost to be approximately $39,000 to
remove the silt from the pond. This is a rough estimate as it is based on only four samples
obtained within a surface area of over 32,000 square feet. The Homeowners working directly
with a contractor may be able to negotiate a better price.
You may recall that recently I mentioned that to make our connection from the drainage system
in Town Center to the pond may necessitate the draining of the pond. At that time, there could
be coordination by the Homeowners group to better define the areas of the silt to more
accurately define the amount of silt to be removed and/or work with the contractor or their own
contractor to attempt to remove the silt while the lake is drained. Removing the silt while the
lake is drained makes the most sense from an economic standpoint and could actually reduce the
cost mentioned above.
If you should have any questions concerning this please feel free to contact me at your
convenience.