Sprint PCS-CS010202 February 2, 2001
Mr. Mike Martin
City Engineer
City of Coppell
Coppell, TX 75019
Mr. Martin,
The proposed fire lane for the Sprint Site 512 - Coppell location was designed
using the Texas Department of Transportation's (TxDOT) Flexible Pavement Design
Software. The road was designed for a 20-year lifespan based on the soils report and
assumed traffic data. Since no traffic ~-~"o:~ ~ · ,
,~,,,,: .... was available, thc road was aes~gncct to
TxDOT frontage road standards. Given that the road be designed to support a 40,000 lb
fire truck, the road was checked using TxDOT's modified triaxial procedure to ensure
that it could withstand the shear loading of the fire truck.
The following proposed pavement structure meets or exceeds the requirements of
the TXDOT flexible pavement design software and the modified triaxial loading test.
2" Type "D" Hot Mix Asphaltic Concrete
6" Type "A" Flexible Base
10" Lime Stabilized Subgrade
Because there is an existing concrete drainage channel on the site, it was decided
to construct a concrete channel, matching the existing channel, sufficient enough to
support a fire truck. Drainage along the proposed fire lane will be collected in the
proposed bar ditch and transported via the bar ditch to the existing channel. Silt fencing,
a rock filter, and broadcast seeding will be used to provide erosion and sediment control.
If you have any questions regarding the pavement design, or if I can be of any
further assistance during construction, please contact me.
Sincerely, '~"
/
Erwin A. Lehmann III. P.E.
ARCHCOMM DESIGN INC., ARCHITECTS
MEMBEFI OF THE AMEFIIGAN INSTITUTE OF AFIGHITEGTS
~840 Lockhill-$elma, $te. '101 · San Antonio, TX 7821:3 · Phone: (2~0) 308-9905 Fax: 308-99136 · Email: archcomm@yahoo.com