The document summarizes proposed improvements to the Lick Creek Wastewater Treatment Plant, including replacing pumps, adding process controls, improving clarifiers, modifying sludge handling equipment, and replacing an aging centrifuge. The total cost of the project is estimated at $2.3 million. Key aspects of the project include replacing an old centrifuge for $990,100, adding new flow meters for $189,000, and improving sludge holding capacity with tank modifications for $311,000. The director recommends awarding the construction contract to Bryan Construction.

1. LICK CREEK WASTEWATER
TREATMENT PLANT MISCELLANEOUS
IMPROVEMENTS
Chuck Gilman, P.E., PMP
Director, Public Works Department
June 14, 2012

2. Background
 WWTP was constructed as a “Package Plant” in
1987, and then expanded to 2 MGD in 2002
 Multiple concerns remedied with this project
 Items packaged together to get better
construction prices
 Improvements are not impacted by potential
nutrient limits that may be imposed by TCEQ in
the future

3. Project Overview
 Pump Guiderail Repair
 Process Controls
 Clarifier Catwalks
 Return Activated Sludge Modifications
 Centrifuge Replacement
 Sludge Holding Tank
 Centrifuge Improvements

4. Guiderail Repairs
 Lift station pumps at the
beginning of the plant
process are submerged
in a concrete structure
mounted to guiderails
 Over time these have
been damaged and will
be replaced
 Bid Price - $11,900

5. Process Controls
 Enable plant operators to
collect and report data
 New flow meters at plant’s
influent lines, new meters
for sludge processing, and
new meters in the aeration
basins
 Bid Price - $189,000

6. Clarifier Catwalks
 Clarifiers are large,
circular concrete tanks
with rotating equipment
 Catwalks will provide
operators with 360
degree access for safer
and more efficient
operations
 Bid Price - $291,000

7. Return Activated Sludge
Modifications
 A portion of the
activated sludge
removed from the
clarifier is returned
to the aeration basin
and a portion is
wasted to the
thickener
 Bid Price - $321,000

8. Centrifuge Replacement
 After digestion is complete, the sludge must
be de-watered as much as possible, to
minimize disposal costs
 The sludge must be de-watered as much as
possible, to minimize disposal costs.
 The existing centrifuge at Lick Creek is
experiencing chronic breakdowns
 Bid Price - $990,100

9. Centrifuge Replacement

10. Sludge Holding Tank (Alternate A)
 The existing holding tank
is too small, forcing
operators to dispose of
the sludge more
frequently, which is
inefficient.
 Modifications to the tank
and the installation of
new equipment will
increase the holding
capacity of the tank
 Bid Price $311,000

11. Centrifuge Improvements
(Alternate B)
 When the new centrifuge is provided
under Item A5 above, the old centrifuge
will be available for use as a back-up,
 A new platform for the old centrifuge so it
can function as a back-up when needed
 Bid Price - $64,000

12. Centrifuge Improvements
(Alternate C)
 The existing control panel for the centrifuge
does not function properly, due to harmonic
interference with the existing unit.
 This portion of the project provides that new
control panel, for dependable operation of
the centrifuges.
 Bid Price - $126,000

13. Recommendations
 Award construction contract to Bryan
Construction, $2,304,000
 Accept all alternates proposed in the bid
Proposal