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<br /> <br /> <br />mg/1 <br />SPRING & POND 17 SULFATE <br />so <br />45 <br />40 <br />35 <br />30 <br />25 <br />20 <br />15 <br />10 <br />5 <br />0 <br />~ MIN. <br />MEAN <br />^ MAX. <br />,.. ., .. .._. .. ,. :;a~r,~::,.. ..~ iS'+:xi...r:al.. ., .,. _..., ~.~:...J~IZiLd"Cs E:~'-... 'a.i2:..:Uas....,::.'s~;.7:.. l ,..4i,r,. ._ <br />1987 1986 1985 1984 1983 <br />