Connell Skaggs-CS 900416COpp~.n PUBliC MORKS
April 16, 1990
Alan Ratliff, City Hanager ~
Steve Goram, Director of Public Wor.
Shohre Daneshmand, P.E., Acting City Engineer~
Connell Skaggs Drainage Improvement Options
We have reviewed the above referenced drainage improvement options
as prepared and proposed byConnellDevelopment,s Engineer and have
the following comments.
Option %1, Construction of a 10' x 8' box culvert is the best
alternative based on staff's review and recommendation. As
an enclosed system, if built, it would be adequately installed
in the existing 20' drainage easements with minimal
maintenance needed.
Please note that per the agreement between Skyhawk
Venture/Connell Skaggs Development Co. and the City of
Coppell, dated Dec. 11, 1988, there is a cap on the funds
available in the amount of $$45,000.00. Due to trench safety
laws, the cost of such construction has increased. Per the
attached cost estimate for option %1, presently funds in the
amount of $728,000.00 is required to construct this drainage
system. Additionally, p/ease note that as per attached memo
dated 2/14/90, Larry Jackson has indicated that we probably
could require Boorhem & Hinckley to put in a box culvert just
like we required Connell.
Installation of 2- 4' x 12' box culvert and concrete lined
channel, Option %2, is staff's second choice, which may be
considered, but with the estimated total construction cost of
$534,000.00, there weuld still be a limitation in availability
of funds. At the present only $345,000.00 are available per
agreement.
Please note that staff has the following concerns on this option=
ae
Lack of adequate Drainage Easement (DE) in order to
construct such drainage system, there would be a need for
minimum of 30' D.E..
b. Existing fences would need to be moved back to
accommodate for open drainage channel.
c. Haintenance of such system is of a concern to staff.
option #3would be a concrete lined open channel with the cost
estimate of $259,130.00, from Sandy Lake Road to the High
School culvert. Please note that staff would have the same
concerns as listed for option #2; however, the proposed cost
is $85,000 (+) less than the amount agreed upon in the
agreement. Should this option be approved, staff recommends
that the surplus funds ($85,000 +) be escrowed with the City
for future maintenance of the channel and/or purchase of any
related equipment for such maintenance.
Staff along with connell Development Representative will be
available at the April 24, 1990, City Council meeting to answer any
questions.
SGG/MSD/bb
CONNELL.MSD