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KL E I N F E L D E R <br /> in the presence of ozone to iodine. The iodine further oxidizes to a colored species with a direct <br /> proportion to the ozone concentration. The result can then be compared to a color chart <br /> expressing concentration. <br /> On September 10, 2003, samples collected from MW-DIS-11s and MW-DIS-14s .were field <br /> analyzed for ozone gas. The ozone gas was measured using an ozone sensor developed by Eco- <br /> SensorO, h-ic. (Model A-21ZX). The ozone sensor draws in a gas sample via vacuum and gives <br /> an immediate numerical readout expressed in parts per million (ppm). <br /> I <br /> 12280.MON/ST03R1392 Page 8 of 14 <br /> ®2003,Kleinfelder,Inc October 13,2003 <br />