DFW Trade JV-CS 970307Mar-07-97 10:19A Grapr~ine Public Works 817~81 0369 P.02
March 7, 1997
Mr. Robcrt Marshall
Goodwin & Marshall, lnc.
6001 Bridge Street, Suite 100
Fort Worth, TX 76112
Fax: (817) 446-3116
Re: Review of the Construction PI.ns for Patriot Drive
Drainage review Comments
(Received 02/2 !/97)
Dear Mr. Marshall:
The City has reviewed your initial cot~strucfion plans submittal for the above ret~renced project. The
staffcomments are attached This review is in addition to the previous review already completed by
City sta~ The attached review comments need to be addressed prior 1o "Release for Construction.'
If you havc any questions concerning the above comments, do not hesitate to call me
Sincerely,
John D. Robertson
Drainage Coordinator, Graduate Engineer
cc: Construction }rile
Mr. Doug Johnson, IDI Texas District Office, 5420 I,BJ Freeway, Suite 1275, Dallas, TX
75240
Scott Dyer, Senior Civil Engineer
Ken Griffin, City of Coppell, Fax: (972) 304-3570
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Tt t£ CITY OJ:
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Mar-07-97 10:19A Grap~'~ine Public Works B17~-,~81 0369 P.03
Construction Plans, Draimmge Cmnments
Patriot Drive
Ma~h 7, 1997
GENERAL COMMENTS
* Provide hydraulic calculations for street flow capacity (including water spread) as well as
calculations fbr storm sewer hydraulic grade lines.
* Show interim conditions for stubbed pipes as discussed in the March 5, 1997 meeting. It was
discussed that these stubbed pipes would have a temporary headwall, to be detailed later, with
erosion protection and ground tapered to grade of pipe inlet.
SHEET 10, DRAINAGE AREA MAP
* Show flow arrows for buildings and tand adjacent to Patriot Drive drainage area,
* Swap inlet At and A2 designations on drawing.
* For each drainage line, change subbasin designation to match drainage line identifier. So
areas tributary to Line "A" would be A I. A2, etc. and those tributm.-y to Line "B" would
be B1, B2, etc .. and so on
* Show flow into each inlet and stubbed pipe, on the map, t'rom each lributal,-y area (Q in).
* Structure Computation Table has incorrect drainage area to inlets. Revise table.
* Show parabolic cross-section for detenaaining water spread on road. If maxhnum water spread
limits are exceeded (One lane not open during I O-year storm), then additional inlets are
required.
Slt£ET 12, S'FOR34 DRAIN LINE "B"
* An access Mil is need along Lin~ "B', The m~imum MH spacing for a 36" pipe is 600 feet,
Line "B" is shown as 914 feet without access.
SHEET 15, STORM DRAIN I,INE LATERALS
* Show HGl.s tbr laterals.
Mar-07-97 10:20A Grap('~ine Public Works 817~-481 0369 P.04
ConsCrucfim~ Plans, Dr~inaRe Comnten[~
Palri~t Drive
March 7, 199'/
SHEET 16, STORM SEWER DETAILS
* Recessed inlet i$ required.
MISCELLAN EO U S COMMENTS
* This review is in addition to not replacement of any previous review completed by City
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