Memorandum
City of
Utilities
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TO: |
David Corliss –
City Manager Cynthia Boecker, Assistant City Manager Diane Stoddard, Assistant City Manager |
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FROM: |
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CC: |
Philip Ciesielski –
Asst. Director of Utilities David Cox - Asst.
Director of Utilities |
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Date: |
March 4, 2008 |
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RE: |
March 11, 2008
Agenda Item – Engineering Services to prepare a Wastewater Facilities Master Plan including a review of the
Scope and Timing of the Wakarusa Water Reclamation Facility Utilities
Department Project #UT0706 Advertise a
Request for Proposals |
Please include the following item on the City Commission
agenda for consideration at the March 11, 2008 meeting:
Authorize Staff to advertise a Request for Proposals for
engineering services to prepare a Wastewater Facilities Master Plan including a
review of the scope and timing of the Wakarusa Water Reclamation Facility.
Project Background
The 2003 Wastewater Master Plan
evaluated wastewater treatment capacity, the projected growth in wastewater
demand, alternative scenarios to convey and treat the increased demand, and
pending regulatory actions to provide an adequate and dependable wastewater
system for existing and future customers.
Since the adoption of the 2003 Wastewater Master Plan, the Department implemented a schedule
of Capital Improvement Projects (CIP) designed to replace and rehabilitate aged
infrastructure and to increase the capacities of existing facilities to
accommodate growth. To date more than $23 million dollars worth of projects
have been completed. The Department has taken the lead, or participated in,
constructing facilities designed to extend the sanitary sewer system to areas
of growth; most notably to the northwest and southeast of the City.
In addition, a siting study has been completed and the property
for the Wakarusa Water Reclamation Facility (WWRF) was purchased and annexed
into the City. A Basis of Design Report and Design Memorandum have also been completed
for the WWRF detailing projected wastewater flows, treatment technologies and
process control strategies. However, the population growth rates used within
the 2003 Wastewater Master Plan to
identify the size and timing of the WWRF have not been realized and questions
concerning the correct timing and capacity of the WWRF have been raised.
The 2003 Wastewater
Master Plan is more than four years old and based on limited technical
information more than six years old. Given the changes in the population growth
rate, the completion of numerous CIP projects, the amount of new technical
system data and that the typical life of a master plan is five years it is time
to prepare a new master plan.
Project Status/Details
The new Wastewater Facilities Master Plan will be based on
improved system and flow information, with more detailed data than any previous
wastewater system evaluation. During the last several years, the department
initiated efforts using the latest technologies to enhance critical system data
acquisition and information accuracy specifically for this purpose. The new
Plan will review the growth rate projections and development patterns within a
defined boundary. One of the first phases will be a review of the WWRF with
recommendations for timing of the construction and initial capacity of the
project.
Using the detailed system and flow information a hydraulic model of the
sanitary sewer collection system will be created. Several intermediate and
build-out scenarios will be modeled. The results of the model runs will be used
to create a recommended watershed based service plan with established criteria
to determine construction schedules. Previous Master Plans have only indicated
the planning year that the improvements are needed. The new Plan will also have
a rehabilitation and replacement component based on system age, regulatory
compliance changes and staff knowledge of the system. Upon completion of the
project, the calibrated model network and software will be delivered to the
City for use by staff to determine more accurately the impact that proposed
developments will have on the collection system.
Project Funding:
Funding for the project will come
from the 2008 Utility Operations Fund.
Action Request:
Authorize Staff to advertise a Request
for Proposals for engineering services to prepare a Wastewater Facilities
Master Plan including a review of the scope and timing of the Wakarusa Water
Reclamation Facility.
Thank you for your assistance. Please advise if you have any questions.