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0 9 0 <br />Water Quality 8A&8B <br />200 <br />18C <br />160 <br />140 <br />120 <br />0 <br />100 <br />d <br />c 80 <br />U <br />60 <br />40 <br />20 <br />0 <br />1/97 7/97 1/98 7/98 1/99 7/99 1/00 7/00 1/01 7/01 1/02 7/02 1/03 7/03 1/04 7/04 1/05 7/05 1/06 7/06 1/07 7/07 1/08 7/08 1/09 7/09 1/10 <br />Date <br /> I <br /> <br /> II L <br /> <br /> <br />r <br />? <br />¦ <br /> <br />¦ r. <br />' <br />i <br /> j <br /> i <br />-M- 8A-sulfate -?-- 8B-sulfate