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n (E) <br />www.ae2s.com <br />June 22, 2022 <br />Mr. Don Peterson <br />Director of Public Works <br />City of Mounds View <br />2466 Bronson Drive <br />Mounds View, MN 55112 <br />Re: Change Order No. 26 <br />Mounds View 2019 Water Treatment Plant Rehabilitation Project <br />City of Mounds View <br />Mounds View, Minnesota <br />Dear Mr. Peterson: <br />AE2S continues to oversee the post -construction phase of Contract No. 1 — Mounds View 2019 <br />WTP Rehabilitation Project awarded to Shank Constructors, Inc. The Project reached <br />substantial completion on April 271", 2021. <br />Throughout the warranty period of the Project it was identified that the media retaining nozzles <br />on the drain down system at WTP No. 2 and WTP No. 3 are experiencing excessive clogging <br />that delays the drain down step within the backwash procedure. Cleaning of these nozzles <br />would be a manual maintenance item, which is not acceptable. To mitigate this concern in future <br />operations, AE2S submitted a Request for Pricing (RFP) No. 5 to Shank Constructors, Inc. on <br />June 151", 2022 that modifies the drain down piping system. Shank Constructions, Inc. <br />submitted PCO 26 on June 22nd, 2022 in the amount of $59,830. AE2S has reviewed PCO 26 <br />and confirms that it is representative of the Work required to modify the drain down piping <br />system at both WTP No. 2 and WTP No. 3. <br />In summary, Change Order No. 26 is being submitted to Mounds View to formally consider and <br />take action on at the June 27th Council meeting. Should you have any further questions please <br />do not hesitate to contact me at my e-mail Abbie.Browen(o)-ae2s.com or on my cell phone at <br />715-781-8860. <br />Sincerely, <br />AE2S <br />A4' <br />Abbie Browen, E. <br />Project Engineer <br />Attachment <br />Change Order No. 26 <br />Advanced Engineering and Environmental Services, LLC <br />6901 East Fish Lake Road, Suite 184 • Water Tower Place Business Center • Maple Grove, MN 55369 • 763-463-5036 <br />