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r <br /> WEST COAST ANALYTICAL SERVICE, INC <br /> BC Laboratories Inc Job No 80895 <br /> Attn Vanessa Surratt September 9, 2005 <br /> Cert-Butyl Acetate and tert-Butyl Formate by GCMS <br /> Parts per Billion(Mg L} <br /> Sample tert-But l Acetate tert-But I Formate <br /> 0508602-08 ND ND <br /> 0508602-09 ND ND <br /> Lab Blank ND ND <br /> Detection Limit 2 2 <br /> Date Analyzed 09-01-05 <br /> Quality Control Summary <br /> Sample 0508602-09 <br /> Spike Spike <br /> Sample Spike Spike Spike Dup Dup Spike . <br /> Compound Result Conc Result % Rec Result %Rec RPD <br /> tert-Butyl Acetate ND 498 524 105 508 102 3 <br /> tert-Butyl Formate ND 494 86 17 7 1 14 19 <br /> Z hese low recoveries were obtained from samples that were spiked, then sat in the autosampler for <br /> several hours prior to analysis To determine if the poor recoveries were due to possible hydrolysis <br /> during this time, an additional MS/MSD set was prepared and analyzed immediately <br /> Spike Spike <br /> Sample Spike Spike Spike Dup Dup Spike <br /> Compound mpound Result Cone Result % Rec Result % Rec RPD <br /> tert-Butyl Acetate ND 498 57 1 115 55 5 111 3 <br /> tert-Butyl Formate ND 494 527 107 51 0 103 3 <br /> These results indicate that tent-butyl formate is not stable in these water samples for an extended period <br /> The method is capable of accurately and precisely determining the compound in freshly spiked samples <br /> • <br /> This report is to be reproduced in its entirety <br /> Page 2 of 2 <br /> W <br />