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19 <br />As shown on the attached map, about 12% of the County's land area can be <br />categorized as having high susceptibility to contamination. About 21% of the <br />County ranks as low potential for contamination. <br />Water Quality Summary <br />Table ~ <br />Com orison o f Selected Resu lts and Drinkin g Water Stand ards <br /> ., <br /> .~ .~ <br /> <br />PH (units) 8.3 4.72 6.93 Not less than <br /> 6.5 units <br />Conductivity 523 ms/cm 26 ms/cm 180 ms/cm No established <br />(microsiemens limits <br />er centimeter <br />Dissolved 9.4 mg/L 0.03 mg/L 2.5 mg/L No established <br />Oxygen limits <br />(milligrams per <br />Litre <br />Alkalinity 194 mg/L 24 mg/L 103 mg/L No established <br /> limits <br />Nitrate 7.2 m /L 0.02 m /L 0.49 m /L 10 m L <br />Tron 1100 1 N/A ~ 0.30 m /L <br />Manganese 890 0.4 N/A 0.05 mg/L <br />(micrograms per <br />Litre <br />Calcium 64 mg/L 0.8 mg/L 23 mg/L No established <br /> limits <br />Magnesium 21 mg/L 1 mg/L 4.4 mg/L No established <br /> limits <br />Fluoride 0.6 m /L 0.1 m /L 0.12 4 m /L <br />Lead 3.7 1.1 N/A 0.015 m /L <br />Zinc ~ 4900 4.5 N/A 5.0 mg/L <br />(micrograms per <br />Litre <br />Copper 24 1.1 N/A 1.3 mg/L <br />(micrograms/ <br />Litre <br />Radon 4462 pCi/L 38 pCi/L 405 pCi/L 300 pCi/L or <br />(picocuries/Litre) 4 000 CI/L <br />17 <br />