Program Delivery Plan

SECTION 6. EMERGENCY GENERATORS
6.3 Wastewater Treatment Plants
For the North and South/Central WWTPs, the generation capacity needed was estimated
based on the future estimated total flows and current loads seen at each of the plants.
Natural gas generators were selected due to operator preference for natural gas. Cost
estimates were developed for both the stand alone generators, and for the installed
generator systems including automatic transfer switches, equipment pads, enclosures, and
other site specific equipment necessary to integrate the generators into the facility’s
electrical system
The North WWTP estimated generator installed cost is $5.3 M (including estimated sales tax
waiver) for 7.5 MW of generation capacity. This cost for standby power at the North WWTP
is also listed in Section 5.5 North Master Plan Improvements Table 5-25 – Summary of
Estimated Construction Costs for the North WWTP.
The South/Central WWTP estimated installed cost is $9.3 M, for 12.5 MW of generation
capacity. This cost is already included in the estimated construction cost for the Phase 2
expansion project (STP-C-0002, South WWTP Phase 2 – Master Plan Portion).
6.4 Generator Project Delivery Plan
In order to install generators in a timely manner at all pump stations and the North and
South/Central WWTPs, a project delivery plan was developed. The first step in developing
the project delivery plan was to prioritize the pump stations that were to get generators
using the following criteria:
1) Pump stations to be replaced as a part of PDP
2) Existing pump stations (not impacted by this PDP) that overflowed during Hurricane
Gustav
3) Existing pump stations (not impacted by this PDP) that were on DPW staff’s list of
critical pump stations
4) Existing pump stations (not impacted by this PDP) that were not on any of the previous
lists (with larger pump stations receiving higher priority than smaller pump stations)
The WWTPs were prioritized based on the PDP and Draft Master Plan projects. As
mentioned above, the South/Central WWTP generators will be installed as part of the South
WWTP – Phase 2 project, with the generators funded as part of the overall project. The
North WWTP generators will be installed as part of the North WWTP Master Plan project.
The existing Central WWTP will not receive emergency generators, since current plans call
for it to be decommissioned.
The schedule of the project delivery is based on this prioritization as well as available
budget. The available budget for generators is estimated to be $10 million in 2009, $10
million in 2010, and $13 million in 2011. Therefore, for each of these three years, the first
priority was the budget for generators at the PDP pump stations. After that, the second,
third, and fourth priorities were considered in the order noted above. Table 6-3 shows the
cost summary- for generator installation.
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