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Mr. Justin Femrite, P.E. <br /> OApril 10, 2014 <br /> Page 2 <br /> The selected option for biosolids treatment is to treat biosolids using aerobic treatment and produce a cake <br /> product using screw presses. The existing anaerobic digesters will be redesigned as aerobic digesters and <br /> the existing biosolids storage tanks will be converted to aerobic storage. The liquid product will be <br /> pumped to a building housing the screw presses where the biosolids will be dewatered and the City will <br /> land apply the cake product to their existing land application sites or landfill the cake product. The <br /> additional costs associated with the revised biosolids option are detailed below. <br /> Cost Estimate and Fees for Revised Biosolids Scope <br /> Item Cost <br /> Site Work $100,000 <br /> Site Piping $100,000 <br /> Building $615,000 <br /> Pumps/Piping $150,000 <br /> Dewatering Equipment $915,000 <br /> Sludge Batch Tank $50,000 <br /> Conveying Systems $50,000 <br /> Mechanical $200,000 <br /> Electrical $200,000 <br /> Total Construction Cost $2,380,000 <br /> Contingency $238,000 <br /> Engineering Fee $343,845 <br /> Less Engineering Fee Per Contract ($82,045) <br /> Additional Engineering Fee $261,800 <br /> Total Project Cost $2,879,800 <br /> As shown above, the additional engineering fee is $261,800. This will cover both the design and <br /> construction phases of the project. These additional fees have been included in previous cost estimates <br /> for the revised scope project. <br /> We appreciate your consideration of our request. If you have any questions regarding any of the above <br /> please do not hesitate to give me a call. <br /> Sincerely, <br /> BOLTON&MENK, INC. <br /> Seth A.Peterson, E. <br /> Principal Engineer <br /> G:\Elk River\T21106811\1_CorresVemrite ltr 10apr2014.docx <br />