Committee of the Whole

City of Oconomowoc Committee-Of-The-Whole Tuesday, March 21, 2023 - 6:30 PM City Hall - Conference Room 3 (Closed Session) & Council Chambers (Open Session) 174 E. Wisconsin Ave. Oconomowoc, WI 53066 (or immediately following Utility Committee) Notice: If a person with a disability requires that the meeting be accessible or that materials at the meeting be in accessible format, call the City Clerk at least 48 hours prior to the meeting to request adequate accommodations. Tel: (262) 569-2186. 1. Call to order and confirmation of appropriate meeting notification 2. Committee Business a. Closed Session - Convenes in Conference Room 3 Per Wis State Stat 19.85(1)(e) Deliberating or negotiating the purchasing of public properties, the investing of public funds, or conducting other specified public business, whenever competitive or bargaining reasons require a Closed Session. (Specifically to Determine TIF Value for the Proposed Olympia Hills Development) b. Open Session – Convenes in Council Chambers Consider/recommend Resolution 23-R3109 Awarding Contract Amendment for Design Modifications (Iron Filter) and Construction Administration Services for Well No. 8 Pumping Station 3. Adjourn ________________________________ Diane Coenen, City Clerk City of Oconomowoc Notice is hereby given that a majority of the Common Council will be present at the above scheduled meeting to gather information about a subject over which they have decision-making responsibility. This constitutes a meeting of the Common Council pursuant to State ex rel. Badke v. Greendale Village Board, 173Wis. 2d 553, 494 N.W. 2d 408 (1993) and must be noticed as such, although the Common Council will not take any formal action at this meeting. 1  MEMORANDUM DEPARTMENT - WATER UTILITY Date: March 21, 2023 To: Mayor Magnus and Common Council From: Utility Staff - Joe Pickart, Scott Osborn P.E., Lucas Caine P. E., Kevin Freber Re: Consider/Act on Resolution 23-R3109 to Add an Iron Filter to the Design of Well 8 Pumping Station to Maximize Pumping Capacity and Minimize Phosphorus Levels at the Wastewater Plant RELATES TO THE STRATEGIC PLAN Strategic Goal- I – PROVIDE A SAFE AND SECURE COMMUNITY  I.D – Provide and Foster Safe and Clean Water BACKGROUND December 2022 – Completion of 219 foot deep, 16-inch diameter high capacity municipal well, 2,500 gpm January 2023 – Confirmed elevated iron levels. Performed a pilot test to check effectiveness of current chemical treatment. Requested an updated engineering services and construction cost estimate from Strand Associates ADDITIONAL ANALYSIS Well #8 located in the Pabst Farms area is complete. Upon receiving the final water quality results, the iron levels were elevated (1.4 mg/L to 1.5 mg/L). This compares to our existing wells of 0.0 mg/L (no detect) to 1.3 mg/L. Currently we add three chemicals to our water before being pumped to customers: chlorine, fluoride, and orthophosphate. Chlorine provides disinfection, fluoride aids in dental health and orthophosphate coats the distribution pipes keeping lead and copper from entering the drinking water and to sequester iron. Use of Polyphosphates to Address the Iron Currently, we use a polyphosphate to address our lead and copper drinking water standards. The secondary benefit with this is we also sequester the iron. Sequester means the chemical surrounds the iron molecules so they don’t come into contact with the chlorine. What goes in, must come out. The downside of using polyphosphates is our WWTP must add a chemical to reduce the phosphorus levels in their discharge from the plant to the Oconomowoc River. Presently, the drinking water phosphorus is a minor contributor to the overall amount. 1 2 Pumping Capacity and Impacts of Polyphosphates Well 8 has a potential pumping capacity of 2,250 gallons per minute (gpm). We were fortunate to obtain this as the capacity from Well 2, slated to be abandoned, is 1,400 gpm. We can offset this lost capacity and have an extra 850 gpm for future growth. With the higher pumping capacity from Well 8, the amount of phosphates needed to handle the iron on a daily basis would increase from 12 pounds to 23 pounds. The WWTP cannot handle this large increase of phosphorus and stay within their discharge limits and operational capabilities. It is estimated the daily phosphates would increase from 12 pound per day to 23. To offset the impact from the increased chemical usage the pumping capacity would be cut to 550 gpm to keep the WWTP within their operational and discharge requirements. At this reduced pumping level, we are no longer covering the lost 1,400 gpm from the abandonment of Well 2. To obtain the lost 850 gpm, a second new well would be required at some time. In summary We can address the iron from the new well with increased chemical cost. At a lower pumping capacity, the WWTP could stay within their required operational standards. They would also have a higher chemical cost to remove the phosphorus. A second well would be needed in the future. Adding Iron Filters to the Well Design and Construction Installing large water filters would reduce the iron, reduce the phosphorus impacts to the WWTP and allow for maximum pumping capacity. Removing the iron before it enters the water distribution system provides for a better product and eliminates residents concerns on cloudy water due to fires, watermain breaks or flushing. Phosphorus levels at the WWTP under current pumping would decrease from 12 pounds per day to 9.7 (versus an increase to 23). The largest benefit is we would be able to maximize the pumping capacity to 2,250 gpm. FINANCIAL IMPACT Present project funding budgeted in 2020 have been used for:  Well design, drilling and construction administration  Hydrogeologist design and construction administration  Pumping station design and construction administration  SDWLP awarded $4,000,000 to help finance the project Original project cost estimate submitted for approval = $3,600,000 Tasks associated with adding iron filters include:  Additional design engineering (by Strand Associates) $187,500  Additional construction administration (by Strand Associates) $42,500  Pilot filter test $35,000 Revised pumping station construction cost estimate = $5,300,000 SUGGESTED COMMITTEE OF THE WHOLE MOTION Suggested Motion: Motion to recommend to the Common Council approval to re-design Well 8 pumping station for iron filtration to maximize pumping capacity while minimizing the impacts to our WWTP operations with regards to phosphorus regulations and removal cost. SUGGESTED COMMON COUNCIL MOTION Motion to adopt Resolution 23-R3109 2 3  RESOLUTION NO. 23-R3109 RESOLUTION AWARDING CONTRACT AMENDMENT FOR DESIGN MODIFICATIONS (IRON FILTER) AND CONSTRUCTION ADMINISTRATION SERVICES FOR WELL NO. 8 PUMPING STATION WHEREAS the raw water quality of Well No. 8 was found to have elevated levels of iron; and WHEREAS, design and construction administration services are to be modified to accommodate the re-design of the pumping station to include an iron filter to mitigate elevated iron levels in the Well No. 8; and Whereas, based on a proposal from our design engineering firm, the project would be modified to conduct a filter pilot test, re-design the pumping station and provide additional construction administration services to accommodate an iron filter. Now Therefore Be It Hereby Resolved, City staff recommends the existing design contract with Strand Associates be amended to include additional compensation to incorporate the re-design with an iron filter and to also provide the construction administration services for the Well No.8 Pumping Station in the amount of $265,000 be accepted. BE IT FURTHER RESOLVED, that expenditures for this work with a 10% contingency total a not-to-exceed cost of $291,500 to be charged to Account 602-573-7000-810, Project Number 222008. DATED: March 21, 2023 CITY OF OCONOMOWOC By: _____________________________ Robert P. Magnus, Mayor ATTEST: Diane Coenen, City Clerk 4