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<br />I <br />I <br />I <br />.1 <br /> <br />i <br />, <br /> <br />,II <br />:,1 <br /> <br />" <br /> <br />"1 <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br /> <br />Columbia. <br />River <br /> <br />Portland Water Supply System <br /> <br />t Bull Run Watershed - some <br />components built in early 1900's <br />t Transmission 3 - 40 km conduits <br />t Columbia Well Field - built in 1980's <br />t Treatment - chloramination, pH <br />adjustment <br />t Distribution - primarily cast iron <br />