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Northwest Metro t <br />atzr Study <br />METROPOLITAN COUNCIL ENVIRONMENTAL <br />SERVICES (MCES) I ST. PAUL, MN <br />The capacity and future of existing groundwater supplies in <br />the Northwest Metro may not be sufficient to meet future <br />demands. To evaluate the feasibility of a joint surface water <br />or groundwater drinking water system, the communities <br />of Corcoran, Dayton, Ramsey, and Rogers decided to <br />collaborate with MCES. <br />MCES retained SEH to complete a technical assessment of <br />the capital and operational costs, as well as the potential <br />benefits, of the following options: <br />• Ajoint surface water treatment plant taking water from <br />the Mississippi River <br />• A joint groundwater treatment plant <br />• Governance and cost sharing options <br />The approaches ultimately evaluated in the study will not be <br />prescriptive, but will serve as examples to stimulate future <br />planning that could involve a hybrid of alternatives identified <br />in the study, or in combination with water conservation <br />measures and other sustainability approaches. <br />REFERENCE Ali Elhassen, PE, PhD <br />Metropolitan Council <br />651.602.1066 <br />SEH TEAM Chris Larson I Project Manager <br />ater Treatment Plant No. 1 <br />CITY OF CLOQUET, MN <br />The City of Cloquet has manganese in its Well 8 that <br />exceeds the Minnesota Department of Health's (MDH) <br />recommendations. The City also utilizes a natural spring <br />for a portion of its drinking water. The spring is currently <br />classified as groundwater, but if it is determined that the <br />spring is under the influence of surface water, Cloquet would <br />need to treat this water or quit using it. <br />The City of Cloquet hired SEH to design a water treatment <br />plant to remove the manganese from Well 8. The schedule <br />for the project was extremely tight due to funding deadlines. <br />In three months, SEH needed to prepare a feasibility study <br />to determine the correct solutions and then do a full design <br />of a water treatment plant. SEH investigated three water <br />treatment plant sites and two treatment options (steel <br />gravity and concrete gravity). The solution selected was a <br />1,000 gallon per minute concrete gravity filter treatment <br />plant at Cloquet's Public Works site. <br />The water treatment plant processes include detention, <br />dual media filtration, chemical feeds, a concrete clearwell <br />and high service pumping. The water treatment plant also <br />includes surface water treatment features, including filter <br />to waste piping and valves, if it becomes necessary to treat <br />water from the Spring Lake Reservoir. <br />REFERENCE Caleb Peterson, PE <br />Public Works Director — City of Cloquet <br />218.879.6758 <br />SEH TEAM <br />Chris Larson I Project Manager <br />Miles Jensen I Sr. Project Engineer <br />Jeff Ledin I Sr. Project Engineer <br />Chad Katzenberger I Hydraulic Modeling Engineer <br />Nick Brula I Mechanical Engineer <br />Chad Westbrook I Electrical Engineer <br />SHORT ELLIOTT HENDRICKSON INC. 20 <br />