Hackberry Addition-CS161205T H E • C 1 T Y • O F
COPPELL
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December 5, 2016
Steven G. Dewald, P.E.
Lightowler Johnson Associates, Inc.
700 Main Avenue
Fargo, ND 58103
RE: Hackberry Addition
Blk A Lt 1(Springhill Suites)
Dear Mr. Dewald,
The City of Coppell has reviewed the referenced plans and has the following comments to offer:
General -
1) Add the plat to the plans and include any offsite easements needed for construction. There
will most likely need to be a re -plat as this was platted before. Should be the second or third
page in set. Provide in Engineering plans to be sure all onsite easements are covered.
2) You will need an easement for the portion of the driveway that is on the adjacent property.
You will also need an easement for any other offsite utilities. Provide all offsite easements by
separate instrument at this time. Recorded at county. Provide labels in plans with volume and
page information.
Overall Utility Plan -
3) The 4" meter needs to be located along the ROW of Hackberry.
4) Will you want a separate irrigation meter? Determine now if necessary.
Utility Plan north and south -
5) Will the offsite 8" water handle the rest of the undeveloped property? Size? Provide estimates
based on type of zoning/future land use plan. No point in installing 8" if the rest of the area
needs are not met.
6) Provide better labels for all connections/points. (some engineers use rectangle boxes around
sewer and revision cloud type rectangles around water to be able to differentiate the two) Your
response mentioned use of color... plans must be in Black and white and the plans submitted
to us were in b/w. Provide better labeling system
Drainage Plan -
7) The drainage area at the east property line is concerning. How will the drainage be picked
up? 4:1 slope to PL with no swale to contain your discharge.
8) Do the Hackberry plans show drainage from this lot entering the street? Your response
mentions not being able to receive the plans. Who are you asking?
9) Provide plan and profile sheets for storm sewer that includes hydraulic grade line in the
profile with labels (elev).
...,!i PARKWAY * P.O. BOX 647B * COPPELL TX 75019 * TEL 072 402 0022 * FAX 072 304 3073
2nd Review (Springhill)
Page 2 of 2
a) Add station labels at each pipe change/joint/bend (FL on bottom and station with
installation information on top. Include HGL labels in profile at top.
b) The way the labels are oriented in the profile make it hard to read and follow.
c) Check the HGL calculations as most of the pipe is in partial flow.
d) Revise calcs as time in pipe is not sufficient enough to reduce calcs.
e) Outfall is around 14 fps. Too high. Get it around 6 fps for erosion issues.
f) Add flow information at each major pipe joint (and flume) (Q100, sf, v, d, Qc)
10) Label all lines with size and line name.
Grading Plan -
11) Provide a profile for the channel.
Please make the necessary changes and submit these marked -up plans and two sets of revised
plans to the City for review. If you have any questions, please contact me at your convenience.
Sincerel
George S. Marshall, P.E.
Engineering Manger
Office Phone: (972) 304-3562
gmarshall@coppelltx.gov
255 PARKWAY * P.O. BOX 8478 * COPPELL TX 75010 * TEL 972 402 0022 * FAX 072 304 3673