ST8805-CS 880621� P w
J n Y
GINN INC.
June 21, 1988
�
CONSULTING ENGINEERS
RECEIVED
Mr. Jerry Parche • , P.E. JUN 2 3 10
Jerry Parche' Consulting Engineers
6001 W. Interstate 20, Suite 209, LB 32 1ny hfcmCea E4m
Arlington, Texas 76016
Re: Denton Tap Road Improvements and the Parks of Coppell
Dear Mr. Parches:
This letter is in response to your letters of June 7 and S. 1988
and questions raised in the meeting with ABQ Development on June
13, 1988. We will address the items in the June 7, 1988 letter
first.
The easements requested from Univest Development, some time ago,
were for the purpose of establishing a temporary working area in
which to complete the construction of the road improvements
within the existing R.O.W.. The only exception to this is
the slight encroachment of the property lines at the locations
where the recessed storm water inlets occur. The storm water
inlets will encroach the property line about a foot and a half,
and therefore we feel it is better to secure an easement around
the inlets now than waiting for future R.O.W. or utility easement.
dedications.
In the matter of the requested water line extensions, we agree
that water mains or services must be extended to the west side of
the road. However, the size of, location of, and developer
participation in these extensions must be determined prior to
adding them to the Denton Tap Road construction contract. We
have enclosed blue line copies of sheets 13 through 17 of the
paving plans for your use in laying out your proposed water mains
or service extensions to serve the ABQ property. According to
the subdivision ordinance, ABQ will be responsible for the entire
cost of these extensions, but under the prorata provisions of
the ordinance some reimbursement may be available if these
extensions are mains which will serve adjacent properties.
In our discussions with Mike Allen regarding the median openings
and left turn lanes, we agreed to show these as "futures with the
exception of the proposed opening at Mills Lane. We stated that
we had no objection to the locations of the left turn lanes and
median openings shown on the attached "Median -Left Turn Sketch"
dated 5 -88, by Roberts & Dowdey civil Engineers, as long as
property owners on both sides of the road agreed on the
locations. We cannot include the construction of these
facilities in the Denton Tap Road Improvements unless the
17103 Preston Road • Suite 100 • 12 11 R • Dallas, Texas 75249 • Phone 214/2494900
4t
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property owners escrow the cost of then with the City in advance
of construction. Also discussed was the improvement of Mills
Lane by the adjacent property owners. The Mills Lane
intersection can be revised to conform to the future layout of
Mills Lane to the west if the property owners will coordinate
their efforts with us and give us the surveyed location and
design layout of proposed Mills Lane. The same applies to the
west side of the Parkway Blvd. intersection. It is our
understanding that you are currently preparing the Parkway Blvd.
layout on the west side of the intersection as we discussed so
that we may include the entire intersection in the project.
In response to the requests in your letter of June 8, 1988
concerning the floodplain issues associated with the properties
recently acquired by ABQ we understand by our telephone
conversation of yesterday that you have already begun addressing
the concerns you had regarding the appropriate hydrologic and
hydraulic modeling in paragraph A of your letter. In that
regard, we will stipulate that you use the modeling which has
been accepted by FEMA, but that you must also use your best
professional judgment in considering other data which is more
recent and /or more conservative than that currently in use.
Regarding the hydraulic design requirements for the bridge
structure on Parkway Blvd. at Cottonwood Branch, the discharges
analyzed shall be those that are customarily analyzed for
projects of this type. The freeboard requirements shall be such
that a two (2) foot clearance be maintained between the proposed
base flood elevation and the low chord of the bridge structure.
The determination- of allowable flow velocities will be based on
your best professional judgment considering the flow conditions
and soil conditions, and any concerns expressed by FEMA in their
review of your proposed floodplain reclamation models.
Items C and D of your letter shall be addressed by Ordinance No.
219, a copy of which is attached. For the interim period until
the new City Engineer comes on board and assumes the duties of
Floodplain Administrator, the acting City Engineer / Floodplain
Administrator, H. Wayne Ginn, P.E., shall receive your submittals
and coordinate the reviews mentioned in item E of your June 8,
1988 letter.
In response to your request of June 13, 1988 we are also
enclosing a blue line copy of the Bid Tabulation and the R.O.W.
Map for.the project.,
I trust that the above information satisfactorily addresses your
questions.
si r ,
H. Wa a Gi n, P.E.
JCK /HWG /dsp
cc: Alan D. Ratliff
John C. Karlsruher, P.E.
File J -379 241 -044