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Feasibility Study <br />Water Treatment Plant <br />City of Lino Lakes, MN <br />WSB Project No. 015822-000 <br />TITLE SHEET <br />LETTER OF TRANSMITTAL <br />CERTIFICATION SHEET <br />TABLE OF CONTENTS <br />EXECUTIVE SUMMARY ....................................................................................................................1 <br />1. INTRODUCTION ......................................................................................................................2 <br />1.1 Purpose of Study.............................................................................................................2 <br />1.2 Manganese Health Effects ............................................................................................2 <br />2. EXISTING WATER SUPPLY SYSTEM ................................................................................4 <br />2.1 Sources.............................................................................................................................4 <br />2.2 Treatment .........................................................................................................................4 <br />2.3 Storage .............................................................................................................................4 <br />2.4 Distribution .......................................................................................................................5 <br />2.5 Booster Station ................................................................................................................5 <br />2.6 Interconnections ..............................................................................................................5 <br />3. WATER QUALITY ANALYSIS ..............................................................................................6 <br />3.1 Raw Water Supply ..........................................................................................................6 <br />3.2 Drinking Water Rules and Standards ..........................................................................6 <br />3.2.1 Primary and Secondary Drinking Water Standards ......................................6 <br />3.2.2 Maximum Contaminant Levels (MCLs)...........................................................7 <br />3.2.3 Health-Based Values (HBVs) and Health Risk Limits (HRLs).....................7 <br />3.2.4 Primary Drinking Water Contaminants ............................................................7 <br />3.2.5 Proposed Future Drinking Water Regulations ...............................................8 <br />3.2.6 Secondary Drinking Water Contaminants ....................................................10 <br />3.3 Emerging Contaminants ..............................................................................................12 <br />4. WATER DEMANDS ...............................................................................................................13 <br />4.1 Historical Water Use .....................................................................................................13 <br />4.2 Per Capita Water Demand ..........................................................................................13 <br />4.3 Future Water Demand Projections .............................................................................13 <br />5. WATER SUPPLY OPTIONS ................................................................................................15 <br />5.1 Drill New Wells ..............................................................................................................15 <br />5.2 Purchase Treated Water..............................................................................................15 <br />5.3 Implement Treatment ...................................................................................................16 <br />6. WATER TREATMENT OPTIONS .......................................................................................17 <br />6.1 Current Water Treatment Capacity Needs ...............................................................17 <br />6.2 Future Water Treatment Capacity Needs .................................................................17 <br />6.3 Water Treatment Needs...............................................................................................17 <br />6.4 Water Treatment Options ............................................................................................17 <br />6.4.1 Conventional Gravity Filtration .......................................................................18 <br />6.4.2 Biological Gravity Filtration .............................................................................19 <br />6.4.3 Pressure Filtration ............................................................................................19 <br />6.4.4 Recommended Filtration Option ....................................................................20 <br />7. WATER TREATMENT PLANT SITE EVALUATION .......................................................21