Memorandum

City of Lawrence

Utilities Department

TO:	David L. Corliss – City Manager Cynthia Boecker - Assistant City Manager Diane Stoddard - Assistant City Manager
FROM:	Philip Ciesielski – Assistant Director of Utilities
CC:	Dave Wagner – Director of Utilities Mike Lawless – Assistant Director of Utilities Beth Krishtalka – Assistant to Director Mark Hegeman – Utilities Operations Superintendent Dave King – Utilities Maintenance Superintendent
Date:	January 29, 2013
RE:	Agenda Item – Advertise RFP R1304 for Engineering Design Services Related to Project UT1302CS Pump Station PS04 Redundant Forcemain

Please include the following item on the City Commission Agenda for consideration at the February 5, 2013 meeting:

Authorize Staff to advertise a Request for Proposals, RFP R1304, for Engineering Design Services for Project UT1302CS Pump Station PS04 Redundant Forcemain.

Project Description

Sanitary sewer Pump Station PS04 is located at 810 Walnut Street and has a firm

capacity of 2800 gpm. PS04 delivers all of North Lawrence’s sanitary sewer flows

south across the Kansas River to the Wastewater Treatment Plant at 1400 E. 8^th

Street. PS04 has 2 existing forcemains; 1 each 1956 8” diameter steel which is

currently out of service, and 1 each 1974 18” diameter cast iron and steel. See

the attached map.

In January the Department of Utilities was alerted by a citizen to the presence of an

exposed section of pipe in the north riverbank. Investigation by Staff determined the

exposed pipe to be the 8” 1956 forcemain from PS04. Approximately 75 ft of the

forcemain has become exposed due to riverbank erosion. See the attached photos.

After an evaluation of the forcemain’s existing condition, risk of failure and the

operational parameters of PS04, it was determined that the forcemain should be isolated

from the system to prevent any discharge of sewage to the Kansas River in the event

the pipe failed. In preparation for taking the forcemain out of service it was “pigged”

clean and flushed out. The 8” forcemain is now isolated from the system. The existing 18” forcemain is hydraulically adequate to convey the pump station’s firm

pumping capacity.

Information from the original plans shows the construction of the 8” forcemain to have been to a depth of only five (5) feet below the river bed as it existed in 1956. Based on this, the condition of the exposed pipe and the risk associated with attempting to recover the exposed section the Department of Utilities recommends pursuing the installation of a new, redundant forcemain from PS04 to the Wastewater Treatment Plant to provide reliable sanitary sewer service to North Lawrence.

Project Funding

Funds for project design are from the Department of Utilities non-bonded construction fund.

Action Request: Authorize Staff to advertise a Request for Proposals, RFP R1304, for Engineering Design Services for Project UT1302CS Pump Station PS04 Redundant Forcemain.

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