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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client Applied Earth Sciences,Inc Service Request L2400620 <br /> Project Canteen Date Extracted 03/15/2004 <br /> We Matrix Soil Date Analyzed 03/15/2004 <br /> Lab Control Spike Summary <br /> BTEX by 8021B <br /> Extraction Method EPA 5030B Units ug/Kg <br /> Analysts Method 8021B Basis Wet <br /> Level Low <br /> Extraction Lot LWG0401116 <br /> Lab Control Sample <br /> LWG0401116-3 <br /> Lab Control Spike %Rec <br /> Analyte Name Result Expected %Rec Limits <br /> Benzene 222 250 89 83-126 <br /> Toluene 21 0 250 84 81-120 <br /> Ethylbenzene 21 2 250 85 84-114 <br /> Xylenes, Total 63 9 750 85 * 86-116 <br /> O's Flagged with an asterisk(*)indicate values outside control criteria <br /> Percent recoveries and relative percent differences(RPD)are determined by the software using values in the calculation which have not been rounded <br /> Printed 03/17/2004 17 24 33 Form 312—Organic Page 1 of ] <br /> P 1STEALTHICRYSTAL RPTTorm3LCS rpt SuperSet Reference R]Z5312 <br />