ALP 14

One of the recommendations in the First Filling criteria
provided by the Denver Office was to inspect the outlet works
conduit above the guard gate after the 4 stages of the filling
criteria had been completed. This was to determine if any
change or additional cracking had developed since the
construction of the dam was completed. This inspection would
require* either installing the bulkhead and dewatering and
entering the conduit, or sending a diver down with a Tv camera
and a regular underwater camera for still pictures to inspect
the conduit. In either case, unless the reservoir level' is
drawn down below the recreation pool, a "hard hat" dive with
a barge to work from would be required.
,Action - Reclamation - Reclamation does not feel that
inspecting the conduit by dewatering it is warranted at this
time. All of the instrumentation data collected over the past
5 years shows no significant movement by the conduit and the
outlet works is operating as it is supposed to. The Denver
Office indicates that it would be desirable to send a diver
into the conduit with a camera to gain more definitive visual
information on the conduit condition. However, this would be
contingent upon such things as safety considerations, costs,
and quality of information obtainable. A telephone quotation,
with the last dive team that inspected Reclamation dams, was
for $50,,000 to $60,000 to do the dive. Because of the long
conduit, in excess of 500 'feet, and the depth of water,
approximately 200 feet, it is doubtful that any meaningful
information could be gathered. Therefore, Reclamation accepts
the fact that there has been a settlement problem with the
upstream portion of the outlet works conduit, that the problem
appears to have been corrected, and all existing
instrumentation data indicates no significant movement to
date. If in the future an inspection of the river outlet
works conduit is warranted because of a significant change in
the instrumentation data, or structural work is necessary
because of additional movement, Reclamation will, at no cost
to the District, inspect the conduit and /or make the necessary
repairs.
3. A. 24 -Inch Steel By -Pass Pipe
The exterior paint on the 24 -inch by -pass pipe appears to have
failed. The paint in several areas along the pipe is pitted
and bare metal is exposed.
Action - Reclamation - Reclamation will prepare and administer
a contract to either repair the paint or replace it entirely.
The coal tar epoxy on the inside of the 24 -inch steel in the
vicinity of the valve pit will be repaired also.
B. Grout the 24 -Inch Steel By -Pass Pipe
The 24 -inch construction by -pass pipe will be grouted shut
upstream of the 20 -inch butterfly valve located in the gate