Program Delivery Plan

SECTION 5. NORTH BASIN PROJECTS
problem. This project is currently nearing construction completion. Other odor control
improvements recommended at the North WWTP include:
Install flat covers on the primary effluent weir and launder portions of the primary
clarifiers with biotower odor treatment.
Rehabilitate the existing carbon scrubbers on the dewatering building and add a firststage
wet scrubber.
Provide scrubbers and covers at the new influent pump station and headworks.
Digester Gas Utilization
An evaluation of the potential to utilize biogas that it a by-product of the anaerobic
digestion process was discussed in the Master Plan – Biogas Storage and Utilization TM
(CH2M HILL, 2008). The feasibility to capture the biogas and utilize it as an alternative fuel
for heating the anaerobic digesters, rather than flaring the biogas and utilizing natural gas
for heating (the current practice at all three large WWTPs) was evaluated. During the
evaluation, it was found that most of the gas storage equipment, gas compressors, and
engine generators that are necessary to utilize biogas were present but not in use at any of
the three large WWTPs. Based on the evaluation, it is recommended to install biogas storage
at the North WWTP. The stored biogas would be used for heating the anaerobic digesters.
SCADA
The North WWTP SCADA system is discussed in the SCADA section of this PDP.
5.5.4 Estimated Costs
The Draft Master Plan outlines the estimated construction cost of the Priority One and
Priority Two improvements. The costs for standby power and SCADA are included in the
Emergency Generators and SCADA sections of this document, although they are also shown
in Table 5-25 below. The table outlines the estimated construction costs of the North WWTP
Master Plan improvements. Even though costs are presented separately for Priority One,
Priority Two, Standby Power, and SCADA, it is likely that one project would be designed
and constructed to implement all improvements at once. The Total Construction Bid
Amount, assuming that sales tax will be waived on materials, for the North WWTP Master
Plan Improvements is $34,349,000.
TABLE 5-25
Summary of Estimated Construction Costs for the North WWTP
Item
Estimated Cost
Priority One
Building Condition Assessment $3,000,000
Equipment Condition Assessment $4,200,000
Handrail Rehabilitation/Replacement $800,000
Alternate Disinfection (Sodium Hypochlorite) $2,500,000
Priority One Sub-Total Construction Bid Amount $10,500,000
Estimated Sales Tax Waiver -$312,000
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