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AtjHICUL.'1'U1iE K 11HIORITY POLLUTANTS LABORATORY , INC. OUALITY CONTROL DATA <br /> CLIENT: Leedshill-Herkenhoff Inc I . D . # 16492S-164983 <br /> Duplicates Spikes Quality 95% <br /> Analysis Date Control Confi.dence <br /> 1st - 2nd True Percent Source Interval <br /> Sample No Result Result RPD* Sample No Result Value Recovery <br /> 1 ,..1 -DCE 10-23 21 18. 9 20 94 . 4 ianogen59 - 172 <br /> 8 <br /> 1 , 1 -DCE 10-23 22 19 . 9 20 99 . 6 " 59 - 172 <br /> TCE 10-23 21 19 . 0 20 95 " 62 - 1370 <br /> 87 <br /> TCE 10-23 22 20. 1 20 101 " 62 - 137 <br /> 87 <br /> hloro 10-23 21 20 . 5 20 103 " 60 - 133 <br /> benzen 87 <br /> hloro- 10-23 22 19 . 7 20 98. 6 " 60 - 133 <br /> benzen 87 <br /> PCE 10-27 16492S 9. 4 7 . 5 21 <br /> 87 <br /> 1st value - 2nd value F� <br /> RPD ( Relative Percent Difference ) avveeragerage value <br /> alue VVV <br /> 1987 <br /> LEEDSHILL-HERNRJ� ,F6 <br />