ST0501-CS080513(8/3112009) DiWanna Baskins -Meeting minutes-5-12-08.doc
MEMORANDUM
T0: Keith Marvin, P.E. -City of Coppell
FROM: Quinn G. Spann, Jr., P.E.
DATE: May 12, 2008
SUBJECT: Deforest Road Reconstruction-Meeting minutes
Attendees:
Keith Marvin, P.E.
DiWanna Baskin
Mike Garza, E.I.T.
Dan DeGroot, P.E.
Quinn Spann, P.E.
These minutes are just a brief synopsis of out discussion on the referenced project.
1. Revise the right-turn-lane transition so that it starts after Prestwick.
2. Turn on the existing roadway elevation on the profile
3. Match the existing driveway radius. Minimum radius is 5', max is 10'.
4. Add drive at Estrada property
5. Try to raise the proposed roadway so that it is above the hydraulic grade line or at least the
same elevation as the current roadway.
6. We will use the starting hydraulic grade line as show on the plans at MacAuthor on the west
end of the project. We will use the starting hydraulic grade line as shown in the Halff Deforest
Court plans on the east end of the project.
7. Keith talked to Dennis, Halff consultants, about their plans. Dennis said that the inlet on the
south side of Deforest, east of Allen was not in the original study and was a field change. This
water used to go down a separate ditch to Denton Creek. Keith gave GSWW a copy of the
drainage report that was designed by Halff. Keith was informed by Dennis that the drop in the
hydraulic grade line between the development of Windsor Court and Deforest Court was due
to modeling coincidental flows of the Denton Creek. Dennis told Keith that the water in this
area would already be piped to the creek before Denton Creek crested.
8. GSWW was directed to use a 30 minute time of concentration for runoff calculations on the
east storm system to match what Halff used.
9. GSWW will review shifting the roadway centerline slightly to the south to get a 5-foot side walk
on the north side.
10. GSWW will show a minimum of three feet of grassy are on the south side of Deforest prior to
beginning a sloped transition to the existing ground. We will review slope options to reduce
the wall heights.
11. The City will inform GSWW of the final decision of whether to install a signal at Deforest.
12. The City provided some examples for GSWW to review for the neighborhood meeting exhibits
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that we will prepare.