Memorandum

City of Lawrence

Utilities

TO:	David Corliss – City Manager Cynthia Boecker, Assistant City Manager Diane Stoddard, Assistant City Manager
FROM:	Mike Lawless – Project Engineer
CC:	Dave Wagner – Director of Utilities Philip Ciesielski – Asst. Director of Utilities Beth Frailey Krishtalka – Management Analyst
Date:	January 2, 2008
RE:	January 8, 2008 Agenda Item – Engineering Services to Review the Scope and Timing of the Wakarusa Water Reclamation Facility and Perform a Watershed Sewer Service Plan Utilities Department Project #UT0706 Advertise a Request for Proposals

Please include the following item on the City Commission agenda for consideration at the January 8, 2008 meeting:

Authorize Staff to advertise a Request for Proposals for engineering services to review the scope and timing of the Wakarusa Water Reclamation Facility and perform a watershed sewer service plan.

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 that resulted in the recommendation of the construction of the Wakarusa Water Reclamation Facility (WWRF).

Since the adoption of the 2003 Wastewater Master Plan, a siting study was completed and the property for the 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 sizing of the WWRF have been raised.

Project Status/Details

The project will review and update the growth rate and development patterns within defined boundary to confirm the necessary triggers for the construction and initial capacity of the WWRF. This will be the initial phase of the project and establish the criteria to be used to set the schedule for proceeding with the WWRF.

The project will also create and deliver a hydraulic model of the sanitary sewer collection system. The model will be based on comprehensive asset information in the Lawrence GIS and flow monitoring data that has been colleted at more than 25 locations throughout the collection system. 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. The 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 more accurately determine 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 review the scope and timing of the Wakarusa Water Reclamation Facility and perform a sanitary sewer evaluation study and sewer service plan.

Thank you for your assistance. Please advise if you have any questions.