1985 01 15 RDA^ AGENDA
LA QUINTA REDEVELOPMENT AGENCY
A regular meeting of the La Quinta
Redevelo*nent Agen* to be held at
City Hall, 78-105 Calle Estado,
La Quinta, California.
January 15, 1985 7:30 p.m.
1. CALL TO ORDER
2. *LL CALL
3. HE?*RINGs
4. CO*SENT *R
A. Approval of the Minutes of a regular meeting of the La Quinta Redevelo*n*nt
Agency held Dec*r 18, 1985.
5. BUSINESS SESSION
A. Peport fran the Executive Director regarding flood control channel construction.
B. Other.
6. ADJOUI**NT
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^ I *
MEMORANDUM
CITY OF LA QUINTA *
To: Honorable Chairman and Members of the Redevelopment Agency
From: Frank M. Usher, Executive Director
Date: January 11, 1985
Subject: Flood Control Channel Construction
The Coachella Valley Water District has received a report from
Bechtel Engineering regarding soil evaluation for the Bear
Creek channel. It indicates that there would be unreplaced
erosion of sand in a natural bottom channel, and that the
faced embankment of such a channel may be subject to under-
mining and failure. Some additional measures may be taken
to stabilize the bottom of a natural channel, however the
cost of construction would increase by approximately $2.6
million. A cast in place concrete channel would come in at
the originally expected cost for a natural channel. An
intermediate measure of a soil cement lined channel would add
about $100,000 to the planned cost.
In terms of appearance, the natural bed channel is preferable
except that the continually maintained width is 80 feet. A
lined channel would have a width of 40 feet, with an additional
40 feet needed for side drainage ditches on the west side, but
this area would be permitted to regrow with natural vegetation.
Both types of construction would permit walking across the
channel.
A debris basin above Palm Desert is constructed with the soil
cement method. We would like to have the Council see this, so
that we can have your impression before giving further instruction
to Bechtel regarding the type of engineering to be done.
I would like to have everyone meet at City Hall on Monday at
1:30 p.m. We will take several cars to Palm Desert and return
by 3:00 p.m. for the study session. Tom Levy will explain the
engineering concerns.
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