City of Lawrence

Memorandum

City of Lawrence

Utilities Department

TO:	David L. Corliss – City Manager Cynthia Wagner - Assistant City Manager Diane Stoddard - Assistant City Manager
FROM:	Philip Ciesielski – Assistant Utilities Director
CC:	Dave Wagner – Director of Utilities Mike Lawless – Assistant Utilities Director Beth Frailey Krishtalka – Assistant to Director
Date:	January 4, 2012

RE: Agenda Item - Extension of Contract with Marsh McBirney – Hach for data delivery services related to Project UT1203CS the long-term sanitary sewer flow and rainfall monitoring program for 2012.

Please include the following item on the City Commission agenda for consideration at the January 10, 2012 meeting:

Authorize the City Manager to execute a contract renewal with Marsh McBirney – Hach, for the period of January 2012 through December 2012, for data delivery services associated with the wastewater collection system’s long-term flow and rainfall monitoring program in the amount of $52,800.00.

Program History: From October 2006 through December 2010 the Department of Utilities contracted with Marsh – McBirney Hach for data delivery services associated with the long-term flow monitoring program consisting of thirty one (31) flow meters and eight (8) rain gauges deployed at various locations throughout the city, see the attached map.

In 2011, in conjunction with the current Wastewater Master Plan effort, Department of Utilities staff worked with Burns & McDonnell as part of the hydraulic modeling to determine a recommended flow meter and rain gauge deployment that provided for continued data acquisition to support model calibration, operational decisions and development related capacity questions. Based on this the system was reduced to seven (7) flow meters and three (3) rain gauges, see the attached map. Six (6) of the meters remained positioned for the continued acquisition of flow data along major interceptor lines to the wastewater treatment plant. The seventh location is on the bypass line of pump station PS16 located north of 6^th and Kentucky. This location is being maintained in compliance with KDHE’s requirement to continuously monitor the bypass for flow and acquire the data necessary to quantify any flows in the event that the pump station is bypassed.

Program Status: The current contract term expired at the end of December 2011 and staff are recommending the continuation of the services contract for seven (7) flow meters and three (3) rain gauges currently at the locations outlined above for the term January 2012 through December 2012.

Draft Wastewater Master Plan documents indicate there are a number of sanitary sewer basins with high inflow and infiltration rates which are contributing to excessively high peak flow rates at the wastewater treatment plant. Staff anticipate relocating existing flow meters within this program to these basins to accurately quantify the inflow and infiltration rates, and assess the results of proposed corrective programs.

The fee for data delivery services has remained the same since the original 2006 contract. The rates are $500/month per flow meter and $300/month per rain gauge. Per the contract Marsh McBirney – Hach provide all required ongoing maintenance and field services on the flow meters and rain gauges including; battery replacement, calibration, meter replacement due to damage and service on malfunctioning units. The contract contains provisions to credit the monthly charges for flow meters and/or rain gauges that do not provide a set level of accurate data over the month. Department Staff review the data regularly and provide information on nonperforming meters and gauges to Marsh McBirney – Hach for the proper invoice adjustment.

Project Funding: Funding for the program comes from the 2012 Wastewater Operations and Maintenance budget.

Action Request: Authorize the City Manager to execute a contract renewal with Marsh McBirney – Hach, for the period of January 2012 through December 2012, for data delivery services associated with the wastewater collection system’s long-term flow and rainfall monitoring program in the amount of $52,800.00.