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<br />~\\u - ~ W!1 <br /> <br />ITEM 8.2. <br /> <br />e <br /> <br />_ / f ~ ~ ~ ~ CONSULTING ENGINEERS <br /> <br />"""1 Maier Stewart & Associates Inc. <br />August 5, 1993 <br /> <br />File: 230-151-20 <br /> <br />Mr. Patrick Klaers <br />City Administrator <br />City Hall <br />13065 Orono Parkway <br />Elk River, MN 55330 <br /> <br />RE: INTERIM PLAN FOR THE ELK RIVER WWTP EXPANSION <br /> <br />Dear Mr. Klaers: <br /> <br />As you are aware, the rotating biological contactors (RBCs) at the Elk River wastewater <br />treatment plant had experienced a second shaft failure last month and caused two of the eight <br />RBC units to be. out of service. This is an indication that the existing RBC equipment has <br />deteriorated to a point that it could no longer provide a good operation reliability for wastewater <br />treatment. <br /> <br />e <br /> <br />Although the current proposed expansion is under design, it will not be in operation until the <br />Year 1996. We were requested by Mr. Darrell Mack to investigate an interim plan which allows <br />one of the two trickling f1lters proposed in the expansion to be constructed in 1994. <br /> <br />The attached drawing shows the layout of our proposed interim plan which includes one trickling <br />[uter, a pumping station, and the necessary piping. Probable construction costs would be about <br />one million dollars, as shown in Thble 1. A slightly higher total construction cost can be <br />expected to implement an interim plan and later complete the rest of the expansion than to <br />construct the expansion at one time. However, if the interim plan is not implemented, the <br />deteriorating RBC's could potentially break down again and cause the violation of the effluent <br />regulations. Removal of the failed RBC's from the Main Building requires walls to be torn <br />down. Replacement cost for the RBC's will be very expensive. We recommended the proposed <br />interim plan be implemented to ensure the compliance of regulation before the completion of the <br />expansion. <br /> <br />It should be noted that the new trickling f1lter will have 1.1 MGD of treatment capacity. The <br />existing fInal clarifIers only have a capacity of 0.86 - 1 MGD, depending on its performance, <br />which determines the overall treatment capacity of the plant. It is anticipated that the interim <br />plan could satisfy the City's short term need for the next three to fIve years (until 1996-1998) <br />before the completion of the 2.2 MGD expansion. <br /> <br />e <br /> <br />1959 SLOAN PLACE, SUITE 200, ST. PAUL, MINNESOTA 55117 612-774-6021 <br />9800 SHELARD PARKWAY, SUITE 102, MINNEAPOLIS, MINNESOTA 55441 612-546-0432 . Equal Opportunity Employer <br /> <br />lSl-OS04.aug <br />