Northlake 635(8)-CS 870225GINN, INC. CONSI-LTING ENGINEERS
February 25, 1987
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Mr. J. ~ichael Millican, P.E.
Powell &~Powell :." : '"
3988 N. C~ntral Expressway, #1130
Dallas, T~'X. as 75204
Re: Lot 2, Block D
Northlake 635 Business Park
Coppell, Texas
Dear Mr. Millican:
Reference your February 17, 1987, letter to Ms. Shohre Daneshmand,
we offer the following comments for your information.
Since we were not part of the City Staff at the time final plat,
site plan, and engineering plans were submitted, we had no reason
to review those plans. Recently, we were requested by the City
Manager (City Council) to participate in review and approval of
plans. It is not our intention to undermine the high level of
professional cooperation between the City departments and your
firm or to cause a list of design revisions after the plans were
previously approved; but, we feel there are specific items in
your letter and in reference to our letter which need to be
mentioned.
We first reviewed the preliminary plans on October 19, 1984, for
Northlake 635 Business Park, some four months after the
Subdivision Ordinance was adopted. At that time, we requested
verification that storm sewer was designed using TP-40, 100-year
storm frequency. From those plans, it appears that offsite
drainage was designed using TP-40. The onsite drainage appears
to have been designed using TP-25. We re-reviewed the final
plat on November 19, 1984, and had some of the same questions as
on the preliminary plat.
The fire lane, if dedicated to the City, should be shown on plat,
if it is mentioned in written description.
It is our opinion that on the "long" fire hydrant leads, an 8"
main should be used, not 6" as shown.
The ditch to the rear of the property was supposed to have a
concrete pilot channel according to the Northlake 635 Business
Park plans.
Usually, TP&L desires to have an unencumbered easement, solely
for their use. By having parking within this easement, this may
not occur.
Mr. J. Michael Millican, P.E.
February 25, 1987
Page 2
The Subdivision Ordinance states that sanitary sewers may be
constructed of ductile iron pipe, or PVC pipe. Since the
majority of pipe in the City is presently PVC, the City would
like to continue to use PVC. If ductile iron pipe is to be used,
it shall be Class 50, cement mortar lined, (pipe and fittings),
and outside coating.
The plans we reviewed stated Class 150, DR 14, not Class 200,
DR 14. That is why we made the comment we did, just for
clarification.
None of the above comments should be construed as cause for
rejection of the submittal, but taken only as our concerns. If
the staff has approved the plans, we have no objections to
allowing the project to go forward.
Sincerely,
Gabe Favre
/ss
cc: Frank Trando Wayne Ginn
Shohre Daneshmand./