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2. RAW WATER QUALITY AND TREATMENT GOALS <br />2.1 City -Wide Raw Water Quality <br />The raw water pumped from each municipal well in the City of Lino Lakes was tested as part of the Water <br />Treatment Plant Feasibility Study completed in 2020. A summary of the raw water manganese, iron, and <br />ammonia concentrations in each well are shown in Table 2-1. Well 6 was used to conduct the pilot study <br />due to its high combined concentrations of iron and manganese. <br />Table 2-1. Existing Water Supply <br />Well <br />Name <br />Total Iron <br />(mg/L) <br />Dissolved <br />Iron (mg/L) <br />Total Manganese <br />(mg/L) <br />Dissolved <br />Manganese (mg/L) <br />Ammonia <br />(mg/L) <br />Well <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />Well <br />0.181 <br />0.323 <br />0.249 <br />0.256 <br />ND <br />Well <br />ND <br />ND <br />0.383 <br />0.395 <br />0.28 <br />Well <br />0.105 <br />0.084 <br />0.086 <br />0.093 <br />0.21 <br />Well <br />0.310 <br />0.290 <br />0.152 <br />0.151 <br />0.14 <br />Well <br />0.050 <br />ND <br />0.376 <br />0.357 <br />0.21 <br />N/A - Not Applicable; ND - Non -Detect <br />2.2 Well 6 Raw Water Quality and Treatment Objectives <br />The raw water quality measured during the pilot study is presented in Table 2-2. Also shown in Table 2-2 <br />are the target effluent or treatment goal concentrations for the pilot study. <br />Table 2-2. Raw Water Quality <br />Parameter <br />Unit <br />Raw Water Quality <br />Target Effluent <br />Concentration <br />Average <br />Range <br />Total Iron <br />mg/L <br />0.05 <br />0.00 - 0.17 <br />< 0.30 <br />Total Manganese <br />mg/L <br />0.410 <br />0.40 - 0.45 <br />< 0.050 <br />Ammonia-N <br />mg/L <br />0.35 <br />0.30 - 0.40 <br />< 0.10 <br />Dissolved Oxygen (DO) <br />mg/L <br />1.60 <br />0.71 - 3.20 <br />> 4.0 <br />Orthophosphate <br />mg/L <br />0.13 <br />0.07 - 0.23 <br />N/A <br />Total Organic Carbon (TOC) <br />mg/L <br />2.6 <br />1.6 - 3.5 <br />N/A <br />Alkalinity <br />mg/L CaCO3 <br />254 <br />252 - 255 <br />N/A <br />H <br />SU <br />7.03 <br />6.4-7.9 <br />7.0-8.0 <br />Temperature <br />Degrees F <br />51.6 <br />50.2 - 53.4 <br />N/A <br />Water Treatment Pilot Study Report <br />Biological Removal of Ammonia, Iron and Manganese at Well House No. 6 <br />City of Lino Lakes, MN <br />WSB Project No. 018601-000 <br />Page 4 <br />