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PUBLIC WORKS MEMORANDUM <br /> No. 2009— 89 <br /> DATE: September 14, 2009 <br /> TO: Honorable Mayor McElroy and City uncil Members <br /> FROM: Ryan P. McCrady, City Manager `�� `� � C�� �) <br /> Richard G. Marley, P.E., Public Works Director �V� ��� <br /> SUBJECT: Sanitary Sewer Flow Metering Equipment Purchase Approval <br /> SUMMARY RECOMMENDATION: <br /> Staffrecommends that the City Council approve the attached resolution authorizing the <br /> expenditure of$20,475 to purchase flow metering equipment for the sanitary sewers. <br /> PRIOR COUNCIL ACTION: <br /> No prior action has been taken on the acquisition of flow monitoring equipment. <br /> BACKGROUND: <br /> Many of the City's sanitary sewers have capacity problems during rainfall events. This is caused <br /> by a variety of factors including leaking joints and manholes, illegal sump pump connections, <br /> illegal downspout connections, unknown storm inlet connections, etc. Flow monitoring during a <br /> storm event is a critical element in locating problem areas and determining solutions to reduce <br /> storm water infiltration into the system. An immediate need is to determine the wet weather <br /> capacity of the sanitary sewer system that will be accepting the discharge from the upgraded K- <br /> Mart Pump Station. Flow monitoring is needed to make this determination. <br /> The City has used flow meters for years as part of its sewer maintenance program. The current <br /> four Marsh-McBirney flow meters owned by the city were purchased as pre-owned units over 8 <br /> years ago and are no longer functional. The units are estimated to be 10 years old and cost <br /> prohibitive to repair. <br /> Public Works staff has received a quote of$20,475 from Heartland Controls for Marsh- <br /> McBirney flow metering equipment. The detail of the proposed equipment purchase is <br /> presented in Table 1. <br /> Page � 1 <br />