Shadowridge P4/FP-CS 890808 (2)GINN, INC.
CONSULTING ENGINEERS
August 8, 1989
Mr. Russell Doyle, P.E.
City of Coppell
P.O. Box 478
Coppell, TX 75019
Re:
Shadow Ridge Estates IV
Construction Plans
Dear Mr. Doyle:
We have reviewed the construction plans for the above referenced
project for conformance to City standards and offer the following
comments.
The visibility triangle, Bethel School Road at Plantation,
should be 25'x25', not 22'x22' as shown, to match
opposite corner.
Harris Drive street dedication should have Volume, Page
numbers completed. Approval block for P&Z commission and
Mayor should have correct date provided.
Construction of Bethel School Road, escrow of monies, or
escrow agreement needs to be addressed.
Note on Sheet 3, "top of water line shall be no higher than
595.00" needs to be clarified (see drawings).
5. Minimum cover over water lines should be 36".
On drainage plan, time of concentration should be 10
minutes, runoff coefficient should be 0.45, "I" should be
11.6 in./hr, and calculation of "Q" would change.
There is approximately 80 c.f.s, coming from west (Kaye
Street area), which affects southwest portion of this
project, that needs to be addressed.
The plan sheet depicting the alley geometrics (Sht. 5 of 8)
needs to be in compliance with City standards. Width of
alley tie to existing street should be 12'. Widening of
alley pavement from 10' to 12' should occur on both sides of
curve in alley.
17103 Preston Road · Suite 100 · LB 118 · Dallas, Texas 75248 · Phone 214/248-4900
Sheet 5 of 8, Alley transition section: show existing
sanitary sewer lines; show proposed manhole #1; show
flowlines of culverts; show proposed Bethel School Road
paving; verify storm sewer size of 18" RCP; show alley
widths in compliance with standards; show thickness and
widths of flumes and concrete slopes at culvert.
Should you have any questions regarding the above comments or
suggestions, please contact us.
Sincerely,
Gabe Favre
GF/dsp
cc:
Ben dela Cruz
T~ry~ ~man
Sanford LaHue, Schrickel, Rollins & Assoc.
H. Wayne Ginn, P.E.
John C. Karlsruher, P.E.
File 89305-123
enclosure: set of marked-up plans