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I <br /> 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 /> I� Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton /970610-Z2 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9706585-02 Reported Jun 26, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GCO61697BTEX01A GCO61697BTEX01A GCO51697BTEXOIA GCO61697BTEX01A GCO61697BTEX01A <br /> Analy Method, EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A. Porter A Porter A Porter A Porter A Porter <br /> MS/MSD# 970658503 970658503 970658503 970658503 970658503 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Analyzed Date- 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Instrument I D # GCHP1 GCHPI GCHP1 GCHP1 GCHPI <br /> Cone Spiked 10pg/L 10,ug/L 10Ng/L 30ug/L 60Ng/L <br /> Result: 7 9 9 0 9 8 30 68 <br /> % Recovery 79 90 98 100 113 <br /> Dup. Result 81 9 2 10 30 70 <br /> MSD % Recov 81 92 100 100 117 <br /> RPD 25 22 20 00 29 <br /> RPD Limit. 0-25 G-25 0-25 0-25 0-25 <br /> LCS# BLK061697 BLK061697 BLK051697 BLK061697 BLK061697 <br /> Prepared Date- 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Analyzed Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Instrument l D # GCHP1 GCHPI GCHPI GCHP1 GCHP1 <br /> Cone. Spiked. 101ig/L 10Ng/L laug/L 30Ng/L 60pg/L <br /> LCS Result 7 9 87 97 29 67 <br /> LCS % Recov 79 87 97 97 112 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> 0 Please Note <br /> The LCS is a control sample of known,interferent-fres 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 limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Peggy Penner <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9706585 BLA <2> <br />