Nlake 635(9)/PP-CS 870217W. J. Powell P.E. -- 1925-1967
W. Llewellyn Powell P.E.
Richard L. Powell P.E.
J. Michael Millican P.E.
Michael D. McKenzie
POWELL&POWELL
Engineers and Consultants
February 17, 1987
RE: P&P No. 3072-86-9-7
Lot 2, Block D, Northlake 635 Business
Park, Coppell, Texas
Ms. Shohre Daneshmand
City of Coppell
255 Parkway Boulevard
Coppell, TX 75019
Dear Ms. Daneshmand:
We have reviewed the comments made by Ginn,
referenced project (comment letter dated Jan.
following comm ents:
Inc. (acting City Engineers) on the
30, 1987, enclosed) and offer the
The Lot and Block number of the tract (Lot 2, Block D) are correct on the prints
of the Final Plat which are being signed by the owner at this time and are to be
forwarded to the City.
Your office, during the review process of the Final Plat, indicated that the fire
lane was not to be shown on the Plat. The fire lane has been indicated on the
approved Site Plat for the site prepared by WSI Architects.
3. There are no open storage areas on this site.
A screening wall is being proposed at the northeast corner of the building which
would screen the dock area from Crestisde Drive. This wall is shown on the Site
Plan.
Mr. Steve Goram, Director of Public Works, instructed us that, other than those
utilities that are located within the easement dedicated on-site for placement
of the water meter, the utilities and storm drainage on this site will not be
maintained by the City and will not be located in City easements.
6. Mr. Troy Glidewell, City Fire Marshall, advised WSI Architects that the fire
lane turnaround shown on the Site Plan is adequate.
ge
Parking for the future building expansion will be provided by the construction of
additional parking south of the building. The number of space~ will be required
to conform to City of Coppell parking requirements.
The major and street drainage systems for the Northlake 635 Business Park
were designed using a 100-year storm frequency based on Technical Paper 25.
At the time of the development of the business park, the City and Ginn were
3072/0 ~ North Central Expressway, Suite I 130 / Dallas, Texas 75204 / (214) 5224660
Ms. Shohre Daneshmand
February 17, 1987
Page 2
developing the current Subdivision Ordinance. Since the ordinance was not
complete, Ginn, Inc. instructed P&P to design the park drainage systems based
on TP-25, which is used by the City of Dallas and several other municipalities in
this area. Because the systems into which this site drains were designed using
TP-25, P&P likewise designed the on-site storm sewer and based site runoff
calculations from TP-25.
9. The Site Plan indicates 15' radii to be constructed at both drives.
10.
The City Public Works Department and Fire Marshall both reviewed and
approved the water and sanitary sewer plan for the site which shows 6" fire
hydrant leads. All water lines on-site are to be 8" if they supply a fire hydrant
and another water service.
11.
12.
A type "B" headwall as shown in the City of Coppell Standard Details was
indicated to be constructed at the outfall of the proposed 24" storm sewer.
Because of the relatively slow design velocities in the channel (4.7 FPS) we feel
no rip rap on the channel side slope or bottom is necessary at this location.
The future parking south of the building has not been designed, and therefore,
we do not know at this time whether pavement will be constructed in the 13'
Texas Power & Light Co. easement. However, we find nothing in the
Subdivision Ordinance, the Final Plat Owner's Certificate, or the document
which dedicated this easement, that restricts the construction of parking within
the easement as long as Texas Power & Light has access to the easement for
maintenance purposes. This access will continue to be provided if parking is
constructed in the area south of the building.
13.
14.
The City Subdivision Ordinance, Appendix A, Section III-A-9 states that sanitary
sewers shall be constructed of ductile iron or polyvinyl chloride pipe.
The City Subdivision Ordinance does state that P.V.C. water mains of 8-inch
diameter and smaller shall be Class 200, D.R. 14. Please inform us if your wish
any action to be taken on this item.
In responding to the issues raised in the Ginn letter, we respectfully wish to point out
that the Final Plat, Site Plan, and Engineering Plans for this site have already been
reviewed several times by City Staff; and have been approved by the City Staff, the
Planning and Zoning Commission and the City Council. It therefore seems to us that,
after these thorough City reviews which were conducted at a high level of professional
cooperation between the various City departments and our firm, that it is rather belated
to be submitting a list of design revisions to us after we had understood that the plans for
the site were approved.
3072/0127
Ms. Shohre Daneshmand
February 17, 1987
Page 3
If you have any questions regarding this letter, or need any further explanation on any of
the items above, please contact Mr Jim Koch of this office.
Very sincerely,
POWELL & POWELL
J. Michael Millican
JMM:ck
enclosure
cc.'
Mr Ray Garrison - WSI
Mr Tom Cook - Vantage
Mr. Subash Gaitonde -Vantage
Mr. Ed McGuire - Bob Moore Construction
Mr. Gabe Favre - Ginn, Inc.
3072/0127
GINN, INC.
CONSULTING ENGINEERS
February 25, 1987
~ichael Millican, P.E.
Mr.
J.
Powell &~Powell
3988 N. C~ntral Expressway, #1130
Dallas, Te~s 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 Cla~s 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.
the staff has approved the plans, we have no objections to
allowing the project to go forward.
If
Sincerely,
Gabe Favre
/ss
cc:
Frank Trando
Wayne Ginn
Shohre Daneshmand~
. GINN, INC.
CONSULTING ENGINEERS
TO: City of Coppell
Attn: Shohre Daneshmand, Civil Engineer
.....
Attn: Taryon Bowman, Senior Planning
FROM: ¢inn, Inc.
DATE: January 30, 1987
SUBJECT: Lot 2, Block D
Northlake 635 Business Park
'.~
. .
In the short txme frame available to us, we made a cursbr
review of the above referenced subject for qeneral
conformance to the City of Coppell Subdivision Ordinance,
Zoning Ordinance, and applicable standards. The following
sets forth our comments.
We last reviewed this project October 31, 1986, prior to
preliminary plat submittal. If any of the following comments
have already been addressed, please advise.
Lot and block numbers in written description do not
coincide with title block. --- ~ ~ ~
2. Designate fire lanes on plat.
3. Open storage areas should be "screened" in accordance
with Zoning Ordinance 32.1;5.
e
Dock area should be screened from view from Crestside
Drive.
Se
Verify with Public Works whether water mains, sewer
mains, or storm drainage system needs to be located
within easement or not.
Verify with fire marshall that fire lan~ turnaround can
be used in lieu of cul-de-sac turnaround.
e
Will adequate parking be available when future expansion
is completed?
Use technical paper 40, not TP-25, in design of storm
sewer. Also 100-year design frequency is required.
9. Indicate radii on driveway-'
10. Minimum 8' water lines, to dead end fire hydrants.
11. Provide concrete rip-rap or type "C" headwall at ditch
and 24" storm sewer.
12uArea south of building; will area for future parking
expansion overlap the TP&L easement?
13. Do not use ductile iron pipe~nitary sewer.
14 PVC water mains shall be C1 200,
· ass J DR 14
Gabe Favre
/ss