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TABLE 8. OPEN BURNING: . .MBIENT CONCENTRATIONS >305 in (1000 FT) <br /> DOWNWIND <br /> No. Fires Concentrations (Ng/m3) <br /> Analyte n1 where <br /> meas. Median 901yo 901% a3 90th Max <br /> taken LCLI UCLZ Pcnt' <br /> Styrene 45 5 1 ND 16 11 554 2,705 <br /> Ethyl benzene 18 5 3 ND 172 7 172 1,390 <br /> Toluene 45 1 5 1 37 11 156 634 <br /> Benzene 47 In 4 ND 29 11 67 524 <br /> Xylenes 20 ND ND ND 7 4 20 <br /> m,p-Xylene 28 2 1 9 9 14 999 <br /> o-Xylene 38 G 1 1 5 10 13 521 <br /> Chlorobenzene 29 1 ND 1 9 1 1 <br /> 1,1,1-Trichloroethane 30 1 ND 1 9 1 7 <br /> Trichloroethanes 34 1 ND 1 10 1 3 <br /> Carbon tetrachloride 8 ND ND ND 4 ND ND <br /> Trichloroethenes 6 ZI ND ND 18 3 ND 18 <br /> 1,1-Dichloroethane 7 3 ND ND ND 3 ND ND <br /> 1,1,2-Trichloroethane 6 2 ND ND ND 3 ND ND <br /> Chloroform 3 3 ND ND ND 1 ND ND <br /> Methylene chloride 14 ND ND ND 6 ND 660 <br /> Tetrachloroethene 8 ND ND ND 4 ND ND <br /> ' n = number of measurements <br /> 2 The 90 percent confidence limits lower and upper as determined for the median. <br /> 3 Where a is the number of data values from the median to the upper and to the lower 90 percent <br /> confidence limits. <br /> ' The analytes in this table are arranged in order of 90th percentile (except for the o-xylene isomer). <br /> s Contains mixed isomers. <br /> ND =Not detected. <br /> 15 <br />