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3.2 <br />Table 5 Water Quality - Primary Drinking Water Standards <br />Contaminant <br />Highest <br />Average <br />Highest <br />iSingle Test <br />Result <br />- <br />1 <br />Range of <br />'Detected <br />Test Resul p: <br />, <br />IL <br />90% of <br />Results <br />Were Less <br />1 Than <br />EPA Action <br />Level <br />Lead <br />- <br />- <br />1,9 ppb <br />90% of <br />homes less <br />than 15 ppb <br />Copper <br />- <br />0.82 ppm <br />90% of <br />homes less <br />than 1_3 pprn <br />Barium <br />0.11 ppm <br />- <br />2 ppm <br />- <br />- <br />Arsenic <br />1.49 ppb <br />- <br />10.4 ppb <br />, - <br />- <br />2,4-D <br />, <br />0.03 ppb <br />- <br />, <br />70 ppb <br />- <br />- <br />Combined <br />Radium <br />2.2 pCill <br />- <br />, <br />5_4 pCill <br />, <br />, <br />- <br />- <br />Total <br />Trihalonnethanes <br />(TTHMs) <br />2.1 ppb <br />1.70 —2.10 <br />ppb <br />, <br />80 ppb <br />- <br />- <br />Total Chlorine <br />1_14 ppm <br />0.77 — 1.64 <br />ppm <br />4.0 ppm <br />- <br />- <br />Fluoride <br />, <br />0.81 ppm <br />0.59 — 1.00 <br />4.0 ppm <br />- <br />- <br />Notes: Data from Ramsey's Consumer Confidence Report <br />Manganese <br />According to the Minnesota Department of Health (MDH), too much manganese in drinking water <br />can have negative health effects for babies under one year old. At high concentrations, <br />manganese can also have negative health effects for children and adults. To protect bottle-fed <br />babies, MOH recommends manganese levels of less than 0.100 mg/L. To protect children and <br />adults, a manganese level of less than 0.300 mg/L is recommended. To ensure that all residents <br />are protected, MOH has established a Health Based Value (HBV) for Manganese of 0.100 mg/L. <br />Manganese also has a secondary standard of 0.05 rng/L where levels above can cause color, <br />staining, and taste issues. <br />Recently, manganese was included as a contaminant to be monitored under the Fourth <br />Unregulated Contaminant Monitoring Rule (UCMR4), which is discussed in later in this chapter. <br />The City of Ramsey conducted UCMR4 sampling in 2019 which included sampling for <br />manganese. As shown in Table 6, Wells No. 1, 3, 4, and 8 tested above the MDH HBV. Due to <br />the high levels of manganese, IVIDH has recommended to the City that they develop short-, mid-, <br />and long-term plans to address the high levels. In response to the high levels, the City began <br />using wells with the lowest levels of manganese, and when required to use more wells during <br />higher demand times, the City developed a plan to mix the water from the low levels wells with <br />FEASIBILITY STUDY -DRAFT RAMSY 154354 <br />Page 9 <br />