ST9601-CS 910514 ALBERT H. HALFF ASSOCIATES, INC.
May 14, 1991
ENGINEERS · SCIENTISTS · SURVEYORS AVO 11531
I)ALLAS · ARLINGTON · CHICAGO · FORT WORTH
86'6. ".3='--r¢.'ES- PLZ. ZA DP',-'E · 2A_L.:.S -Ex.z.E :522~
Ci~ of Coppell ~~_. ~ ~,,
255 P~kway Boulevgd
Coppell, ~ 75019 ~~
Engineerin~
A~: Shohre D~esh~nd ~o
Re: Wr~gler ~ve
De~ Sho~e:
At yo~ request, Wr~gler Drive was ~flyzed for load capacity ~d projected se~ice life.
Mason Johnston & Ass~ia~s, a l~fl g~technicfl fm was conmct~ to t~e 3 corings tong
Wr~gler ~ve to est~am pavement ~ickness and subbase con~fions. Thek finings m as
follows:
Average asphalt thickness = 4.3 inches
Average base thickness (sand & gravel) = 5 inches
Subgrade = untreated high plasticity clay
Using AASHO design methods and criteria for flexible pavement design the following
assumptions were made. One fully loaded two tandem tractor trailer weighing 72,000 pounds
would enter the site fully loaded and leave the site empty. The empty weight being 28,000
pounds. This would constitute one full round trip. Since pavement design is not only based on
the actual load limit but also includes the frequency of these trips, it is possible to estimate the
life span of a roadway given the number of trips. Under present conditions, with the limited
amount of heavy truck traffic expected in the near future, it is possible that Wrangler Drive can
support limited truck traffic, for a period of 3 to 5 years.
Based upon predicted development schedules and corresponding traffic conditions, we find
the current road pavement adequate to serve the proposed 9.5 acre site, located at the Southeast
comer of Wrangler Drive and Enterprise Drive.
Yours very truly,
ALBERT H. HALFF ASSOCIATES, INC.
,/.9 _
Dennis Chovan
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