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<br /> 178 E 9TH STREET | SUITE 200 | SAINT PAUL, MN | 55101 | 651.286.8450 | WSBENG.COM June 2, 2021 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Mr. Rick DeGardner <br />Public Services Director <br />City of Lino Lakes <br />600 Town Center Parkway <br />Lino Lakes, MN 55014 <br /> <br /> <br />Re: Proposal for Water Treatment Plant Pilot Study <br /> City of Lino Lakes, MN <br /> <br />Dear Mr. DeGardner, <br /> <br />WSB & Associates, Inc. (WSB) is pleased to submit this proposal to provide professional <br />engineering services for completing a Biological Filtration Water Treatment Pilot Study for the City <br />of Lino Lakes, Minnesota. A water treatment pilot study is conducted as the first step to verify the <br />effectiveness of a full scale conventional filtration process with biological filtration to reduce <br />manganese and iron in the City’s well water. The Minnesota Department of Health considers <br />biological filtration to be an efficient and effective treatment method for treating manganese, iron, <br />and other contaminants in public drinking water supplies. In addition, a conventional gravity <br />filtration plant with biological filtration could potentially save the City hundreds of thousands of <br />dollars in chemical costs in the long-term. The purpose of the pilot study is to provide the City with <br />critical information that is required to design and size a water treatment plant if the City decides to <br />proceed with this option to address the high manganese and iron levels in its drinking water. <br /> <br />WSB will perform the following scope of services to assist City staff in completing a biological <br />filtration water treatment pilot study. WSB owns a skid-mounted biological filtration water <br />treatment pilot plant and a laboratory trailer that will be mobilized to the City well with the highest <br />combined level of manganese and iron. The pilot plant equipment will be set-up and calibrated by <br />WSB staff. WSB staff will also train utility staff to assist in the operation of the pilot plant for the <br />duration of the study. The primary assistance required by City staff will be backwashing the filter <br />columns about once every four to seven days, sampling and analyzing water quality samples on <br />site with a water quality analyzer provided by WSB, and checking that the pilot plant is operating <br />each day. <br /> <br />Pilot Testing Processes <br />WSB will prepare a pilot protocol and submit it to the Minnesota Department of Health for their <br />review and approval prior to starting the pilot study. The pilot study will be conducted to assess <br />the efficiency and reliability of the treatment processes tested and to select the process <br />determined best suited for the treatment of the water supply. <br /> <br />Pilot Duration <br />The estimated time frame for the study is 10 to 16 weeks depending on the amount of time it <br />requires the filters to become fully acclimated for biological treatment of manganese and iron. <br /> <br />