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collect a representative sample from diffuse flow without disturbing, and <br /> inadvertently collecting, sediments and organic matter that can produce false <br /> positive metal results. Water from non-flowing, pooled spring water, should also not <br /> be collected as stagnant water is often heavily influenced by bacteria and low oxygen <br /> conditions that alter the water chemistry. In 2020 none of the native springs had a <br /> measured flow above 5 gpm however water quality samples were inadvertently <br /> collected from all four locations. Although these results should be considered <br /> unrepresentative, all the spring samples were compared to the Agricultural Use water <br /> quality standards for discussion purposes. None of the Agricultural Use surface water <br /> quality standards were exceeded at the springs. The 0.2 mg/L Manganese Agricultural <br /> Use Standard is only applicable when irrigation water is applied to acidic soils (<6.0 <br /> pH). For alkaline soils, as are found in the SIIW area, a more appropriate standard <br /> would be 10 mg/L (EPA, 1976). Therefore, none of the manganese results above 0.2 <br /> mg/L were considered exceedances of the standard. <br /> Page 16 of 17 <br />