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QUALITY CONTROL DATA <br /> Total Chromium <br /> Analysis Date Batch Blank LCS% R1 R2 Spike% <br /> 04/07/88 E8804121 <0. 0001 90 0. 0007* 0. 0009 108 <br /> 04/18/88 E8804157 <0. 02 99 1. 6 1.6 90 <br /> 04/21/88** E8804157 <0. 02 100 0. 11* 0. 11 113 <br /> 05/02/88** E8804157 <0. 02 98 19* 18 116 <br /> Hexavalent Chromium <br /> Analysis Date Batch Blank LCS% R1 R2 Spike% <br /> 04/07/88 E8804121 <0. 01 100 <0.01* <0. 01 90 <br /> 04/08/88 E8804157 <0. 01 96 <0.01 <0. 01 100 <br /> 04/22/88** E8804157 <0. 01 104 <0.01* <0. 01 100 <br /> * Duplicate and spike analysis performed on another client's <br /> samples. <br /> ** Data from second analysis which was completed after <br /> inconsistencies were noted. <br /> C BROWN AND CALDWELL LABORATORIES <br />