Devonshire 1-CS 910516 ENGINEERS. PLANNERS o SURVEYORS
May 16, 1991
Ms. Shohre Daneshmand
Acting City Engineer
City of Coppell
255 Parkway Blvd.
Coppell, Texas 75019
Dear Shohre:
Per your request, we have reviewed the various options associated with the sidewalk construction at the
Devonshire project to serve the adjacent school site. We have arrived at three basic options and have
listed them along with advantages and disadvantages for each below:
Devonshire Sidewalk Options:
1. Align sidewalk along Coppell Road with existing improvements in place - railroad tie wall,
landscaping, screen wall.
Advantages: Least expensive.
Disadvantages: Slopes on the Coppell Road side of railroad tie wall are too steep to
place the sidewalk. Locating the sidewalk on the inside of the railroad tic
wall would mean putting the sidewalk against the proposed scrccn wall,
eliminating existing trees, and creating a liability for the City next to thc
railroad tie pilot channel's steep wall. This also prevents new trees frmn
being planted and gives the Coppell Road frontage a poor, harsh
appearance. All of these improvements would have to be reconstructed
when Coppell Road is expanded.
2. Connect the school property to the cul-de-sacs of the subdivision by locating sidewalks in
between lot lines at the ends of the cul-de-sacs.
Advantages: Not costly. Keeps children off of major street (Coppell Road) that has
no curb and gutter.
Disadvantages: Not very effective in directing children to those two sidewalk locations.
Kids will probably usc the alleys for circulation which is not desirable.
May effect the marketability, of the two lots at the end of each cul-de-sac
in which the sidewalks are adjacent.
3. Remove the railroad tie pilot channel and replace with pipe, allowing grading to occur over
the pipe to flatten the R.O.W. and greenway in front of the Devonshire projcct and put in
the sidewalk.
Advantages: Eliminates the liability of vertical drop into the pilot channel. Improves
the appearance of the R.O.W. area. Eliminates the possibility of soil
erosion. Allows sidewalk to be located in a place where it will be used
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Ms. Shohre Daneshmand
May 16, 1991
Page 2
by the children and allows the sidewalk to be located away from Coppell
Road's edge. Allows landscaping to occur along frontage of Devonshire
project. Storm sewer pipe could be designed st) that it could bc
incorporated into the Coppell Road expansion storm sewer improvemcnts.
Disadvantages: Cost.
Wc feel that based on these three options it would bc best for the City and the Developer if the storm
sewer pipc could bc installed along Coppcll Road now. It eliminates many problems and will prove to
cause thc least impact when Coppcll Road expands.
Because the Developer has paid thc required perimeter road fee toward the eventual improvement of
Coppcll Road, it is most agreeable if the cost of constructing thc storm sewer improvements bc paid for
with that money.
If you havc any questions or if we can help in any way Ict us know.
Sincerely,
CARTER & BURGESS, INC.
David Reitz, ~
DR;kn
90313901.L14