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Concentration (ppm ) <br /> 0 0 <br /> 12/15/95 c o 0 0 0 0 <br /> I <br /> I <br /> 1/26/96 F <br /> i I I I <br /> i I I I I <br /> 3/27196 <br /> , ' I ► I I <br /> I , <br /> I , <br /> 5/2/96 _ R <br /> I + <br /> ' n <br /> 6/3/96 ► <br /> , <br /> 7/10196 ,► x <br /> I ► O o <br /> 9/16/96 _ <br /> W O <br /> 11/5/96 ► e <br /> 1/13/97 ♦ fD <br /> 6118197 - ► <br /> ► <br /> Z <br /> I , <br /> 8/28/97 <br /> 10/15/97 _ No. <br /> 10, , I <br /> 12/31/97 _ ► <br />