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• � Sequoia 680 Chesapcakc 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 /> %07 Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> 0 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton/970225-K2 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order # 9702F18 01-05 Reported Mar 18, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC030797BTEX06A GC030797BTEXCeA GC030797BTEXOSA GC030797BTEX06A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A Porter A Porter A Porter A Porter <br /> MS/MSD # GW9702C5701 GW9702C5701 GW9702C5701 GW9702C5701 <br /> Sample Cork N D N D N D N D <br /> Prepared Date 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Analyzed Date 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Instrument I D # GCHP-06 GCHP-06 GCHP-06 GCHP-05 <br /> Cone Spiked 10ug/L 10ug/L 10ug/L 30ug/L <br /> Result 97 9 8 10 29 <br /> MS % Recovery 97 98 100 97 <br /> Dup Result 9 9 9 9 10 30 <br /> MSD % Recov 99 99 100 100 <br /> RPD 20 10 00 34 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK030797 BLK030797 BLK030797 BLK030797 <br /> Prepared Date 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Analyzed Date 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Instrument I D # GCHP-06 GCHP-06 GCHP 06 GCHP-06 <br /> Cone Spiked 10ug/L 10ug/L 10 jig/L 30ug/L <br /> LCS Result 94 94 96 28 <br /> LCS % Recov • 94 94 96 93 <br /> i <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 Is analyzed using the same reagents, <br /> Q OIA NALYTICAL 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 limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> e Pe <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 97021718 BLA 41> <br />