Castlebury-CS 981228GOODW~Ng
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CIVIL ENGINEERS ~ PLANNERS ~- SURVEYORS
December 28, 1998
Mr. Kent Collins, E.I.T.
Graduate Engineer
City of Coppell
P.O. Box 478
Coppell, Texas 75019
RE: Response to Castlebury Court Construction Plan Comments
Dear Mr. Collins:
Enclosed please find two revised blueline sets, and one marked set of construction plans. The
following represents our response to your comments:
The plan view of Castlebury Court has been revised to show the surrounding area and
intersecting streets more clearly.
2. Sheets 2 and 3 have been labeled as paving plan and profile sheets per your request.
o
Per my conversation with you on December 18th and your recommendations, we have
specified 2" of Type "B" and 2" of Type "D" H.M.A.C. on 6" of Lime treated subgrade
for the asphalt transition.
The sidewalks and ADA ramps have been shown on Castlebury Court as well as the
future sidewalks and ADA ramps for Sandy Lake Road. The location of the inlets will
not conflict with future ADA ramps and therefore were not moved.
o
Concrete paving has been extended to the R.O.W. line and an 8' brick paver band has
been specified on the paving plans.
o
Per my conversation with you on December 18th we have revised the Drainage Area Map
to reflect the area draining to our proposed alley. We have also shown that less than 2 cfs
of water is draining through the alley therefore per our conversation an inlet would not be
required.
6001 BRIDGE STREET, SUITE ! OO/ FORT WORTH, TEXAS 76112 / 817-,429-4375 (METRO)
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Mr. Kent M. Collins, E.I.T.
December 28, 1998
Page 2 of 2
Per our conversation on December 18t~ we have shown the same sloped end section
headwall. The City of Coppell alley paving standards and details will be used and a note
is shown on the paving sheet indicating these requirements.
An existing spot grade elevation has been shown at the back of Lot 11.
The proposed improved conditions will be draining less water than the existing
conditions do today. The approximate area draining to the alley and flume is 2.18 Ac.
Using a "C" value of 0.3 and rainfall intensity value of 8.74 (10 min., 100 Yr) along with
this acreage equates to an existing conditions flow of 5.7 cfs. Per our grading plan and
drainage area map we are proposing to reduce that value to 2 cfs for the 100 year storm
event.
The proposed grade on the storm drain profiles has been shown.
An approximate bore depth has been shown on the plans provided the known information
from the Sandy Lake Road construction plans.
The existing 24" R.C.P. pipes are to be removed and the existing bar ditches shall be
graded according to the new location of the 27" R.C.P. culvert. There is adequate cover
and grades to construct a headwall. A detail of the future connection has been shown on
the storm drain plan and profile sheet.
The water line stubout and 20' utility easement have been added per your request.
The size of the residential meters has been indicated on the plans.
The other various minor comments have also been addressed. I appreciate the staff's time and
consideration in the review of this project and if you have any questions, or need any additional
information please do not hesitate to call.
Sincerely,
Goodwin & Marshall, Inc.
Edward W. Eckart, E.I.T.
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