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' Se[] <br /> Sequoia 680 Chesapeake D., Rcdwood City CA 94063 (415) 364-9600 FAX(4t5) 364 9233 <br /> 7 404 N Wiget Lane Walnut Creek CA 94598 (5S0) 989 9600 FAX (510)988 %73 <br /> Analytical 1195tnkerAvenue Suite 8 Sacramento CA 95834 (916) 921 9,500 FAX (9t6)921 0100 <br />' E A Engineering Science &Tech Client Project ID kaon 7-3942 / 51539421307 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Maria Guensler Work Order# 9604E22 04-05 Reported May 13, 1996 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO42596BTEX21A GC0425968TEX21A GCO42596BTEC21A GC042596BTEX21A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA$030 EPA 5030 EPA 5030 <br /> Analyst J Woo J Woo J Woo J Woo <br /> MS/MSD# 960485903 960485903 960485903 960485903 <br /> t Sample Conc N D N D N D N D <br /> Prepared Date 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Analyzed Date 4/24/96 4/24/96 4/24/96 4/24/96 <br />' Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10pg/L 10Ng/L 10pg/L 30Ng/L <br /> Result 89 11 11 32 <br /> MS % Recovery 89 110 110 107 <br /> Dup. Result. 89 11 10 31 <br /> MSD % Recov ,, 89 110 100 103 <br />' RPD* 00 00 95 32 <br /> RPD Limit: 0-25 0.25 0-25 0-25 <br /> LCS #. BLK042496 BLK042496 BLK042496 13LK042496 <br />' Prepared Date 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Analyzed Date: 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Instrument LD * GCHP21 GCHP21 13CHP21 GCHP21 <br /> Conc Spiked' to gg/L 10 Ng/L 10 ug/L 30 ug/L <br /> LCS Result: as 99 96 29 <br />' LCS % Recov. 85 99 96 97 <br /> 60.140 60-140 60.140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike Is an aliquot of sample <br /> 17 <br /> r fortified with known quantities of specific compounds and subjected to the entre analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery Is to be used to validate the batch <br /> Kevin Follett <br /> Project Manager **MS-Matrix Spike,MSO=MS Duplicate,RPD=Relative%Difference 9604E22 EEE <4> <br />