Collocated Precision Clause Samples

Collocated Precision. Table 6-1 summarizes the collocated precision. Only one NH3 mixing ratio exceeded ten times the estimated MDL. Table 6-1. Collocated 24-hour integrated HEADS denuder gases, 04/13/01-6/30/02.(a) Parameter Method Collocated N Absolute Precision (μg/m3) Mean Conc. (μg/m3) Relative Precision Denuder SO2 HEADS / IC 31 5.76 28.4 20.2 % 30 5.85 29.3 20.0 % Denuder HNO2 HEADS / IC 31 0.38 1.70 22.3 % 23 0.44 2.10 20.8 % Denuder HNO3 HEADS / IC 31 0.20 1.27 15.4 % 15 0.27 1.98 13.8 % Denuder NH3 HEADS / IC 30 0.37 1.72 21.6 % 01 N/A N/A N/A