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Q Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N W�get 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 /> Slalne Tech Services, Inc Client Project ID Shell Stockton/971009-131 <br /> } <br /> 1680 Rogers Ave Matrix Liquid <br /> h San Jose, CA 95112 <br /> `Attention Fran Thie Work Order# 9710591-02, 07 Reported Oct 28, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#- GC102197BTEX03A GC1o2197BTEX03A GC1021978TEX03A GC102197BTEX03A GC102197BTEX03A <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.MLraftab A.Miraftab A.Miraftab A.Miraftab A. Miraftab <br /> MS/MSD # 971098003 971098003 971098003 971098003 971098003 <br /> Sample Conc . N D N D N D N D N D <br /> Prepared Date: 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Analyzed Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc.Spiked. 10Ng/L 10 jig/L 10yg/L 30Ng/L 60 fig/L <br /> Result 90 88 8 8 25 71 <br /> MS % Recovery so 88 88 83 118 <br /> 0 Dup Result: 85 8 4 84 23 67 <br /> MSD %Recov. 85 84 84 77 112 <br /> RPD. 57 47 47 83 58 <br /> RPD Limit: 0-25 0-25 0-25 0-25 0-25 <br /> LCS #: BLK102197 BLK102197 BLK102197 BLK102197 BLK102197 <br /> Prepared Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Analyzed Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Instrument I.D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked. 10 jig/L 10ug/L 10pg/I- 30ug/L 60Ng/L <br /> LCS Result 88 86 8 6 24 68 <br /> LCS % Recov 88 86 86 60 113 <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 is analyzed using the same reagents, <br /> o A 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 /> Pe Pen <br /> Project Manager "*MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9710591 BLA <2> <br />