ALP Transfer Inspection Report

Animas -La Plata Project
Feb 13, 2013 Draft Transfer Inspection Report
TRANSFER ISSUE
STIPULATION
Air compressor capacity
Reclamation will evaluate the air compressor capacity during the
may be inadequate for gate
crest gate modifications, air blast system enhancement, and 2013
and air blast operation
filling of Lake Nighthorse.
Excessive settlement of
Reclamation will continue to monitor previous concrete repairs
concrete stairs at intake
and ensure that excessive concrete settlement does not impact
Project operation. Should the settlement become unacceptable,
structure
Reclamation will repair or replace the stairs.
Crane outrigger placement
Reclamation will provide acceptable loading information for
is unknown for handling
outrigger placement while installing or removing the bulkhead
bulkheads
gates.
Background: In April 2012, sediment was removed from intake structure, intake pipe, and
suction manifold. Sediment was also removed from the detention pond at the same time.
Reclamation has undertaken numerous activities and modifications to minimize the
amount and frequency of sediment removal; however, it is anticipated that sediment
removal will be an ongoing maintenance activity.
2. Crest Gates
The intake structure features three 14' -3" wide by 7' high steel crest gates, actuated with air
bladders that have been temporary converted to water filled bladders.
TRANSFER ISSUE
STIPULATION
Gates unable to properly
Reclamation will install a functional, all- season gate actuating
regulate flows
system, that provides independent gate operation, and the
ability to identify and automate gate positioning.
Background: The crest gates were converted to a water bladder system during initial
reservoir filling. The original gate system used a single manifold air supply line bladder
system that was unable to regulate flows and make small adjustments.
Reclamation, in consultation with the Association, is installing a test independent air
bladder system for each of the three gates with isolated air lines and controls. This system
will be evaluated, in consultation with the Association, during the 2013 reservoir filling. If
successful, a permanent system will be installed. The new independent air bladder
permanent gate system will be able to operate each crest gate independently and provide
for automated gate operation.
3. Fish Screen System
Fish screen /barrier panels with support guides and seats are provided at the intake
structure to prevent fish and other aquatic forms from entering the pumping plant, and
ultimately Lake Nighthorse. In 2012 all Fish Baffles were adjusted to the settings
recommended in the TSC August 2009 "Fish Screen Evaluation" report to optimize approach
velocity and uniformity across the screen face.
Background. Fish screen cleaner trolley, cable, and I -beam were redesigned and replaced
in 2012.
Transferred Works Inspection 13 Animas -La Plata Project