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v <br /> 9 Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Chevron 9-6171, Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9602848 -01 -03, 05 -07 Reported Feb 21, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Anallyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GCO21696STEX22A GCO21696BTEX22A GCO21696BTEX22A GCO21696BTEX22A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst R Lee R Lee R Lee R Lee <br /> MS/MSD # G9602724-03D G9602724-03D G9602724-03D G9602724-03D <br /> Sample Cone.: N D N D N D N D <br /> Prepared Date: 2/16/96 2/16/96 2/16/x6 2/16/96 <br /> Analyzed Date* 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Instrument I D #: GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result. 98 99 10 31 <br /> MS % Recovery: 98 99 100 103 <br /> Dup Result: 11 10 9 6 31 <br /> MSD % Recov : 110 100 96 103 <br /> RPD 12 1 0 41 00 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # GBLK021696A BS GBLK021596A-BS GBLK021696A BS GBLK021696A BS <br /> Prepared Date 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Analyzed Date 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result 90 93 97 30 <br /> LCS % Recov 90 93 97 100 <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 is 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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limas due to rnatrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Mike Gregory <br /> Project Manager **MS=Matrix Spike, MSD MS Duplicate, RPO=Relative% Difference 9602848 GET a 1> <br />