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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988-%73 <br /> �II7� Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> Blame Tech Services, Inc Client Project ID r Shell Stockton%971202-L1 <br /> 1680 Rogers Ave Matrix Liquid <br /> 'San Jose, CA 95112 <br /> wAttention Fran Thle Work Order# 9712358-10 Reported Dec 31, 1997, <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GC121697BTEX03A GC121697BTEX03A GC121697BTEX03A GC121697BTEX03A GC121697BTEX03A <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 Mirattab A. Miraftab A.Miraftab A Miraftab A Miraftab <br /> MS/MSD#. 971277503 971277503 971277503 971277503 971277503 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Analyzed Date 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Instrument I.D # GCHP3 GCHP3 GCHP3 GGHP3 GCHP3 <br /> Cone Spiked 10yg/L lopg/L iopg/L 30Ng/L 60pg/L <br /> Result 81 8 0 82 23 72 <br /> MS % Recovery 81 80 82 77 120 <br /> Dup Result 8 6 83 8 4 24 76 . <br /> MSD % Recov . 86 83 84 80 127 <br /> RPD 60 37 24 43 54 <br /> RP-D-Limit. o-25 0-25 __0-25_ 0-25. 0-25 <br /> LCS # BLK121697 BLK121697 BLK121697 BLK121697 BLK121697 <br /> Prepared Date 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Analyzed Date 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Instrument I.D.# GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Cone Spiked 10 pg/L 10 pg/L 10 pg/L 30 lig/L 60 pg/L <br /> LCS Result 8 4 8 5 8 6 24 76 <br /> LCS % Recov 84 85 86 80 127 <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 /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> S 0 IA NALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sampi <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LGS recovery is to be used to validate the batch <br /> g enner <br /> Pr ct Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9712358 BLA <4> <br />