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Comparison of the upwind and downwind VOC concentrations indicates <br /> that upwind concentrations were similar to downwind concentrations <br /> with a few exceptions. Downwind concentrations of methylene chloride <br /> (58 ppb) and 1,1,1-trichloroethane (38 ppb) were higher than upwind <br /> concentrations for Sample AA-13 collected on March 3, 1988; however, <br /> the higher downwind concentrations may have resulted from the very <br /> limited sample volume. <br /> PJ9 9390304.00D 3-5 Rev. 0 09/20/88 <br />