Engineering comments GINN, INC.
April 13, 1989
Mr. Russell Doyle, P.E.
City of Coppell
P.O. Box 478
Coppell, TX 75019
CONSULTING
ENGINEERS
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Re: Kentucky Fried Chicken
Zoning Request and Final Plat/Construction Plans
DRC-Engineering
Dear Mr. Doyle:
We have reviewed the above referenced project and offer the
following comments.
Regarding the Zoning Change Request from Retail to Commercial-
Special Use Permit with Drive-Thru, we suggest the monument sign
not be indicated on the Site Plan at this time under the SUP but
rather be handled as a separate issue. Also, a Variance Request
should be added on the Site Plan for a north-drive access to be
allowed off of Denton Tap Road. These Site Plan revisions can be
made conditions of any motion when considering this issue at the
Planning & Zoning meeting with the revisions being requested to
be made prior to the Zoning Change Request going forward to City
Council.
Regarding the Final Plat we have the following comments.
Applicant should re-verify the square footage and acreage
calculated for this site.
Per the City's Comprehensive Floodplain Management
Ordinance, paragraph 4 on page 34, a Floodplain Permit note
needs to be added to the plat. This site, however, is not
within the limits of any existing floodplain or floodway,
therefore, a permit number for development would not be
applicable.
Any proposed fire lanes outside the limits of the platted
site need to be dedicated by separate dedication
instruments. These instruments should be executed,
notarized and provided to the City prior to the Final Plat
being submitted to the city Council for consideration.
The floodplain note shown on the Final Plat is not required
to be on the plat, and thus, can be deleted.
17103 Prcston Road ·Suitc 100 · LB Il8 · Dallas, Tcxas 75248 · Phone 214/248-4900
Se
The need for the Variance Request for a north-drive is due
to the Sub-Division Ordinance requiring, for a 35 mph
roadway, 100 feet be provided between drives and for a 40
mph roadway 120 feet be provided. Approval of the variance
would allow a driveway spacing of only 72 feet
approximately. Circulation will still exist without this
drive via the common access drive between McDonalds and this
site. Please reference the attached excerpts from the Sub-
Division Ordinance.
Regarding the Construction Plans we offer the following comments.
Power feed from TU Electric should be an underground feed
from Denton Tap.
Site should sewer (sanitary) from the rear as per the
original Preliminary Engineering plan. This will alleviate
the need for the applicant to open cut approximately 65 feet
across the new Denton Tap Road pavement (3 southbound lanes,
median and 1 northbound lane). Public safety and reduced
liability will be better assured for both the applicant and
the City with this requested revision.
The 2" domestic water tap should be in the same trench as
the fire hydrant lead tap if the new Denton Tap Road
concrete pavement is existing at the time the site develops.
This will alleviate the need for 2 street cuts or tunnels
(whichever is required by Public Works) and only require 1.
Ail pavement shall be required to be 6" thick, 3000 psi at
28 days with a 6" lime stabilized subgrade (6%). This
includes any drives. Also, no cushion sand is allowed
between the subgrade and the pavement.
Applicant must submit written permission from the property
owner prior to the City allowing any pavement to be placed
outside either the platted area or outside any fire lane
easement boundaries. This shall be required prior to
approval of the construction plans.
Please call if you have any questions.
Since? ~.
;;:id~pPei f fer:. E! .
cc:
Robert Howman, Ayres Assoc.
DRC
File 89305
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DR]VEWAY RAD]US
Al! d=tvewoys tnte=secttng dedicated st=eets shol! be built w~th o
circulo= cu=b =ad,us connecting the stx-~nch =a[sed cu=b of the =oadway
to the design width pavement of the d=tvewa¥. D=tveways sha]! be ]ocated
fo: enough f:om the inte:to: p=ope=ty line to pa=mit the curb ~adtus to
fall enti:ely in f:ont of the sub)act p:ope:ty. The City Enginee: shall
app:ove the d:iveway widths and d:tveway :adius at the time of site plan
:eview p:evious to issuance of any but]ding pa=mit. In o:de: that the
definition of the location of the edge of pavement fo= the tho:oughfa:e
may be maintained, d=ivewoy :adJi sha]] a]~ays be designed to become
tangent to the st:eat cu:b line. Two-way driveways shall always be
designed to [nra=sect the st:eet at a 90-deg:ee angle. One-way d:iveways
may be designed to tnte:sect a st:eat at a minimum ~5-deg:ee angle.
DR[VE~AY SPAC]NG AND LOCATION
The spacing a~d locatio~ of d:iveways shall be =e~ated to
adjacent d=~veways and nea=by street intersections. The spacing
between d~iveways shall be dependent upon [he speed limit of the
thoroughfa=e and a~e ~ecommended as follows: Isee Figu=e ~1
~D~D~_~D~-~J D~tveway SEacing (Feet) 'D"
20 ~5
~5 ~5
30 ~0
35 100
~0 1~0
~5 150
50 200
Appendix A
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Minimum spacing shal) not be mo=e than ten feet less than the =ecommended
spacings shown above. Spacings between d=~vewoys wt)l be measu=ed along
the p=operty )ine f~om the edge of one driveway to the closest edge of
the next d=~vewoy and not from centerl~ne to cente=line. At intersections
with no free r~ght-tu=n ]one, the m~nimum d~stonce A, F~gu=e 2, of a drive-
way f=om the intersection of ma}o= tho=oughfa=es sba]] be fifty feet and
the minimum distance A, F~gu=e 2, of o d=ivewoy f~om the lnte=section of
minor tho=oughfo=es sha]l be tht=ty feet. Gene~o] =equt=ements fo= d=tve-
way design ore shown in F~gu=e 2. A summo=y of d=[vewoy width,
and ang)e requirements is given in Tob]e
TABLE 11
SUMMARY OF REQUIREMENTS
RESIDENTIAL
COMMERCIAL
IhI~JSTRIAL
WIDTH
Minimum 12 20 IlS 1-woyl 20
Maximum
RIGH1 TURN RAD]US
Minimum 5 10 15
Maximum 15 20 25
ONE-WAY DRIVE ANGLE
Minimum {deg=eesl 45 45 45
MISCELLANEOUS THOROUGHFARE STANDARDS
A. Specific detai]s shol) be as shown in the Design Stando=ds
fo= the City of Coppell.
Appendix A
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LEGEND
A-Distance bock from ir~ertection
R - Driveway radius
Wo Approach width
D- Distance between' driveways
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50' Minimun
W
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FIGURE 2 -- GEOMETRIC
FOR
DR I V E WAY
DESIGN
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