ST9002-CS 910107 GINN, INC. CONSULTING ENGINEERS
January 7, 1991
Ms. Shohre Daneshmand, P.E.
City of Coppell
P.O. Box 478
Coppell, TX 75019
Re: Southwestern Drive
Paving, Drainage, Water, Sewer & Bridge Improvements
Coppell, TX
Dear Ms. Daneshmand:
The City of Coppell's Engineering, Public Works, Streets,
Utilities, Parks, and Construction Inspection departments have
completed their review of the above referenced plans that were
submitted on December 3, 1990. The following sets forth our
comments.
1. The approval of the plans is subject to the work being
started within 12 months of the City Engineer's .final
approval.
2. Include "final plat" in set of plans for reference.
3. Please provide~ landscape/irrigation plans for review.
4. Please indicate whether utility companies have
reviewed/verified plans for their required easements,
relocation work, etc.
5. Pavinq Sheet P-1
A. Modify existing median in Freeport Parkway.
B. At SE corner of Southwestern Blvd./Freeport Pkwy. show
existing signs, fire hydrant and valves to be relocated
and/or adjusted.
C. Indicate directional "arrows" and "words" on plans at
intersection.
D. Provide traffic pull boxes and conduits as required.
E. Indicate proposed sidewalks, if applicable.
6. Pavinq Sheet P-2
A. Please identify what happens to existing utilities' in
the Southwestern Annex area. Also, will the R.O.W.
remain or be abandoned?
B. Reconstruct existing inlets at Sta. 17+20 and Sta.
19+25 to City standards.
17103 Preston Road · Suite 100 · LB 118 · Dallas, Texas 75248 · Phone 214/248-4900
7. ALl paving sheets - please indicate sidewalk along
Southwestern Blvd. per City standards.
8. Provide details of proposed barricade for Executive Drive.
9. Please address the "salvaging" of the 24" waterline. Who
will remove it? Will the removed line be reused? What will
become of the salvaged line?
10. Please indicate subgrade construction for drives on detail
sheet P-9.
11. Please indicate type of erosion control proposed for
drainage ditch in vicinity of Southwestern Annex.
12. At Southwestern Drive and channel (Sheet STM-1), what type
of erosion control upstream and downstream of the headwall
is proposed?
13. On Sheet STM-2, existing 12" waterline may be required to be
lowered. Please address. Indicate 100-yr water surface on
Line "E" profile.
14. All driveway culverts that are to be replaced shall be a
minimum of 15" diameter RCP.
15. Where sanitary sewer lines cross under proposed storm sewer,
provide minimum 2'-6" clearance or concrete encase sewer
line, 10' either side of storm drainage line.
16. Where proposed 9'x6' RBC ties into existing 12'x6' RBC,
please provide details or show junction box.
17. At Executive Drive and Southwestern Blvd., consider a
junction box at Sta. 6+19.74.
18. Please provide Sht. S-13, S-14, indicating details for storm
sewer Line "I".
lQ. Provide "sleeves" or install waterlines to medians for
irrigation system.
20. On 16" waterline, where it crosses channel, concrete encase
line from upper 45° bends on each side of Culverts. Provide
minimum 2'-6" clearance from bottom of boxes to top of
waterline.
21. No "open cut" of Southwestern Annex for installation of
proposed sanitary sewer line. No curves in sanitary sewer
lines.
22. On all water sheets, identify which type "valves" to be
provided.
23. On existing fire hydrants that are to be removed and
delivered to City, also remove valve and plug tee.
24. On replacements of residential/business water services, use
Type K soft copper.
25. From Coppell Road, east, in lieu of 12" waterline, an eight
inch line may be installed.
26. See special note on Sheet WS-4 regarding valves, vaults,
overhead crossing etc. Add additional valves as shown.
27. Please clarify questions posed on Sheet WS-6 regarding
salvaged valves, encasement pipe near intersection, etc.
28. General notes regarding sanitary sewer lines: On manholes
deeper than 12', diameter shall be 5' minimum~~ Sanitary
sewer must be separated from water by 9' minimum or use
ductile iron, concrete encased, with 2' minimum separation.
When sanitary sewer lines c~oss over waterline, concrete
encase sanitary sewer line 10' either side of waterline.
Sanitary sewer lines to be SDR 35.
Should you have any further questions, please contact our office.
Sincerely,
Gabe Favre
GF/dsp
cc: Albert Halff & Associates
H. Wayne Ginn, P.E.
File 90441