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<br />The Roseville reservoir holds 30 million gallons of water. Eight million gallons per day enter and <br />leave the reservoir'. Assuming all 1924 grams of mercury entered this reservoir during the year, <br />and that 2920 million gallons of water pass through the reservoir each year, we can estimate the <br />increase in mercury in the water that passes through the reservoir. The current measured <br />concentration of mercury in St. Paul drinking water is less than the detection limit (1,000 ng/L{ <br />The estimated increase in the concentration of mercury is calculated to be 172 ng/L (0.000000172 <br />g/L). This increase is below the analytical method's detection limit for mercury. <br /> <br />It appears that under this highly conservative and extremely unlikely scenario, St. Paul drinking <br />water would continue to meet the drinking water standard for mercury of 2000 ng/L. <br /> <br />Attached is a copy of my calculations supporting this exercise. <br /> <br />If I can provide any further assistance, please call. <br /> <br />, Personal Communication, David Wagner, St. Paul Regional Water Service. August 7,2001. <br />2 Personal Communication, David Schuller, St. Paul Regional Water Service. August 8, 2001. <br /> <br />.. <br /> <br />. . <br />