HomeMy WebLinkAboutRPT 2 NOISE WALL 08-20-90fit
F N IN TION AGE
DEPARTMENT OF TRANSPORTATION
DISTRICT 12
2501 PULLMAN STREET
SANTA ANA, CA 92705
August 6, 1990
Mr. Richard B. Edgar, Mayor
CIty of Tustin
300 Centennial Way
Tustin, CA 92680
Dear Dick:
REPORT NO. 2
8-20-90
GEORGE DEUKMEJIIkN, Governor
61
--RECEIVED
J AUG 91990
Thank you for your letter explaining the reasons which sup
your city's request that a noise wall along E1 Camino Realbet
included in the ongoing freeway widening project.
As you noted, the ongoing project includes constructing a
retaining wall along E1 Camino Real. The wall will support
embankment for the widening which will be constructed with the
future Routes 5/55 stage III interchange project. The existin
freeway lanes will not be altered at this location under the g
current contract.
u
The height of the retaining wall varies from 14 feet to 24 feet
and the top of the wall in the vicinity of Tustin High School
will be 8 feet to 10 feet higher than the existing freeway lane.
Under this condition, the wall will act as a noise wall. During
the stage III contract, the freeway will be widened and therade
will be raised to the top of the retainingwall. g
is done, and prior to shifting traffic to the widened pavement,
a
10 -foot noise wall will be constructed on top of the retaining a
wall.
Constructing the noise wall prior to widening and raising the
freeway grade would be quite difficult and much more costly then
constructing it after the freeway grade is raised. Further,
there would be no perceivable additional noise mitigation
achieved since the retaining wall will act as a noise wall until
the freeway grade is raised. Additionally, there are no
contingency funds available in the current contract to construct
the noise wall.
In light of this information, I believe that constructing the
retaining wall now and deferring the addition of the noise wall
until the Stage III contract is prudent and reasonable.
KEITH E. MC KEAN
District Director
District 12