Parkwood P1/FP-CS 830601 (2)HOGAN & RASOR, ,n=.
Engineers · I~lanners · 0onsultanCs
June 1, 1983
Honorable Mayor and City Council
City of Coppell
616 S. Coppell Road
P.O. Box 478
Coppell, Texas 75019
Re: Subdivision Review Sherwood Park Section One
Coppell, Texas
Gentlemen and Mrs. Thompson:
As per the request af Mr. Scott Barnett, we have completed our review
of the above referenced subdivision to determine its compliance with
the existing Subdivision Ordinance, the requirements of the Texas
Department of Health, and do hereby offer the following:
The Preliminary Plat for the above referenced subdivision was neither
reviewed nor approved by this office.
Final Plat
1. Contours with intervals of 2 feet or less, need to be shown
on plat.
2. Engineers seal needs to be put on plat.
3. Location, type of material and approximate size of all
monuments need to be indicated on plat.
4. Designation of the proposed uses of land within the sub-
division needs to be indicated on plat.
Pavin~
A. Plate No. 2
1. The angle of centerline of street intersections need to
be shown on the plan.
2. The proposed half pavement width of 14.50 feet for Lodge
Road is not wide enough to accommodate two-way traffic.
Need to provide wider pavement section.
3. Show flow arrows on plan to indicate direction of storm
water flow.
4. Concrete sidewalks having a width of not less than four
(.4) feet and a thickness of not less than four (4) inches
shall be constructed of 2000 P.S.I. concrete on both sides
of all streets one (1) foot from the property line and
Sui~;e 800 One (-~elleria Tower
1335,~ NOel f~oad 214/3-q2-4600 Oallas, Texas 75240
Drainage
A.
Be
within the street right-of-way.
Barrier free ramps shall be provided at all street and
alley intersections.
Provide verticle curves at centerline stations 3+00 and
10+00. Verticle curves shall be provided whenever the
algebraic difference in the grades is 1.0% or greater.
B. Plates No. 3, 4, 5 and 6
Same as comments 1, 2, 3, 4 and 5 for Plate No. 2.
Where part of a residential street is being dedicated
along a common property line, the first dedication shall
be one-half on the proposed street right-of-way plus 5 feet.
C. Plate No. 7
1. Same as comments 1, 2, 3, 4 and 5 for Plate 2.
2. Provide 135' Verticle curve at centerline station 1+40.
3. Provide 100' verticle curve at centerline station 5+00.
D. Plate No. 8
Provide drainage easement for concrete flume between lots
34 and 35. Also show drainage easement on plat.
E. Plates No. 9, 10, 11 and 12
1. Show angle of centerline of alley intersections.
F. Plate No. 13
1. Show angle of centerline of alley intersection.
2. Provide drainage easement for flume discharge at low
point centerline station 17+65.90.
Plate No. 14
1. Need to show on drainage area map limits of drainage
area contributing run-off into subdivision.
2. Need to show arrows for direction of storm waterflow.
3. The storm water carrying capacity of all alleys within
the proposed subdivision is exceeded. Need to provide
storm sewers or add curbs to increase carrying capacity
of alleys.
4. Provide drainage easements for all storm sewers lOcated
outside of dedicated street or alley right-of-way.
B. Plate No. 15
1. Indicate on profile, hydrauli~c gradient line keeping
in mind that hydraulic gradient line must be at least
1.5 feet below proposed gutter line.
2. With the storm water carrying capacity of all alleys
being exceeded, additional laterals may be required
along storm sewer.
C. Plate No. 16
Same comments as Plate No. 15
D. Plate No. 17
1. According to subdivision regulations the subdivider
shall dedicate right-of-way on all concrete lined
channels of sufficient width to provide for excavation of
the open channel of proper width, plus ten (10) feet on
each side to permit ingress and egress for maintenance.
2. 450 Skewed headwalls could possibly be used in lieu of
standard headwalls being proposed for the multiple 60"
R.C.P.
3. Recommend the use of guardrails on both Sides of Moore
Road to prevent cars from falling down embankment.
4. Recommend the use of 6" reinforced concrete channel
lining instead of 4" concrete channel lining.
Water and Sewer
A. Plate No. 18
1. The location of the proposed water and sanitary sewer
main in relation to either the centerline of street
or right-of-way, needs to be indicated on the plans.
2. The fire hydrant coverage for Lot 18, Block 2 and
Lot 95, Block I appears to be inadequate. This needs
to be checked to insure required coverage.
3. The manhole spacing for Line "J" is too far apart.
Provide additional manhole at approximate centerline
station 3+35.
4. Additional water valves need to be provided as indicated
in red on the plan.
B. Plate No. 19
At all sanitary sewer manhole locations, provide a mini-
mum of 0.10 feet difference in flowline elevations between
the incoming pipe and the outgoing pipe.
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Others
1. Plans do not include details for paving, storm sewers,
water or sanitary sewer improvements. These details need
to be a part of the plans.
2. The plan profile sheets for the paving improvements need
to show all the proposed, or existing improvements on the
plan. Such as, water, sanitary sewer and storm sewer
improvements.
3. Other comments have been noted on the plans.
We appreciate the opportunity to assist the City in this matter and
please advise us if we can assist you further.
Very truly yours,
HOGAN & RASOR, INC.
Eduardo H. Pe~a
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