HomeMy WebLinkAbout6.f. Approve Plans and Spec's, Carrollton Storm Sewer OverflowDATE: FEBRUARY 9, 1988
TO: MAYOR &'COUNCILMEMBERS
C/O ADMINISTRATOR JILK
FROM: CITY ENGINEER/PUBLIC WORKS DIRECTOR HEFTI
RE: ITEMS FOR THE FEBRUARY 16, 1988 COUNCIL MEETING
NEW BUSINESS
Approve Plans and Specifications for Carrollton Storm Sewer Overflow,
City Project #166
Quite some time ago Council ordered our Consulting Engineers to look into a
solution to the storm water backup problem that occurs at 143rd Street and
Cimarron Avenue in the Carrollton Addition. The problem the Consultants studied
was that during heavy rainfall events the storm sewer system on Cimarron Avenue
would backup the catch basins at Cimarron and 143rd Street and flow down a lot
line to the northwest corner of the Carrollton Addition. This storm water flow
caused considerable erosion that City Crews repaired last summer. The erosion
consisted of a 3-4 foot deep gully which required several loads of fill material
to repair. In addition our crews placed a metal culvert from the top of the hill
to midway down the bottom of the hill to minimize the erosion problems should the
storm sewer overflow again. However, this is only a temporary measure as our
Consultant recommended and Staff agreed the permanent solution would be to
construct an underground storm sewer from the catch basin in the street down the
property line to the low lying area in the northwest corner of the Carrollton
Addition. Our 'Consultants have completed this work and have drawn up the plans
for such an overflow storm sewer line.
Staff plans to use City forces to perform the work regarding this maintenance
project. Staff would also propose on substituting a high quality plastic pipe in
lieu of the proposed concrete pipe in order to reduce material cost. The plastic
pipe is easier to lay and because it is not under any area which would experience
vehicular traffic crossing it will perform satisfactorily.
Using City forces to complete this project will also enable us to complete this
maintenance project in a timely fashion, rather than have to take time to
solicit informal bids and then not have any control over the low bidders
schedule. The schedule is important because the owner of Lot 6, which is now
vacant, plans on building a house in the spring. It would be much easier to
install the pipe prior to his beginning construction. We also need to acquire a
utility easement on the northwesterly portion of his lot so that we can avoid
some trees along the property line. The owner of Lot 6 has dedicated the
necessary easement that we need for the construction. The documentation for the
easement is'being processed for recording through our City Attorneys office.
I will have a set of plans for Councils review at the Council meeting and be
willing to answer any questions Council may have regarding this project.