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Item No: 7D Meeting Date: April 11, 2016 Type of Business: Council Business Administrator Review: ____ City of Mounds View Staff Report To: Honorable Mayor and City Council From: Brandon Stenglein, Public Works Project Coordinator Item Title/Subject: Resolution 8546, Approving Bidding Documents and Authorizing Advertisement for Bids for 2016 Sanitary Sewer Rehabilitation Project Background/Discussion: The municipal sanitary sewer system is composed of approximately 45 miles of trunk sewer, 900 manholes, and 2 lift stations. The sanitary trunk sewer was largely constructed in the 1960’s and early 1970’s using (predominately) clay pipe. The use of clay pipe during this time was the industry standard, but more watertight pipe products (PVC) have been developed and replaced clay pipe to become the new industry standard the last few decades. Unfortunately, the leaky clay pipe incurs unnecessary Met Council treatment costs due to infiltration of ground water into the trunk sewer. In general, one gallon per minute of ground water entering the system equates to $1,000 of Met Council treatment costs annually. Public Works has an inspection and maintenance program for the municipal sanitary sewer system. This program includes inspecting the trunk sewer by televising via camera and evaluating the condition of the pipe. There are a number of defects that are logged while performing inspections, including cracks in the pipe and leaking joints. Repair and remediation of these deficiencies are incorporated into the street and utility improvement projects as much as possible. However, there are trunk sewers not located in these project areas, and conditions of trunk sewers in project areas can change over time. Attached to this report is a map of the sewer lines to be slip lined. A priority list that ranks the segments of pipe needing repair or remediation is maintained by Public Works. One technique used to fix pipes that are in good condition, but have leaky joints, is called slip lining. Slip lining is a method that essentially places a hard liner inside the existing pipe – without digging up the pipe and streets. Slip lining is considerably less expensive than trenching and replacing pipe, and there is no inconvenience cost compared to trenching methods. The Engineering Division of Public Works has prepared plans and specifications (bid documents) in house for use in obtaining public bids for a slip lining project. A public bid is required since the costs of construction will exceed $100,000. The 2016 budget includes $250,000 under the sanitary sewer enterprise fund for this work. Recommendation: Public Works recommends that the City Council adopt the attached resolution. If adopted, the project will be advertised and bid in accordance with state statutes and a bid opening will be scheduled for Tuesday May 3, 2016 at 2:00p.m. After bid opening staff will return to Council for awarding the project (tentatively scheduled for May 9, 2016) before any construction can begin. Respectfully submitted, Brandon Stenglein – Public Works Project Coordinator