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Sequoia 680 Chesapeake Dnve Redwood City, CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> ID <br /> 404 lel Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX (510)988 %73 <br /> IAnalytical 819 Sinker Avenue,Surte 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> ,Blaine Tecli Services, Inc Client Project ID Shell Stockton'/971202-L1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> ,Attention Fran Thle Work Order# 9712358-12 Reported Dec 31, 1,997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC121597BTEX03A GC121597BTEX03A GC121597BTEX03A GC121597BTEX03A GC121597BTEX03A <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 Miraftab A Miraftab A.Mlraftab A. Miraftab A.Miraftab <br /> MS/MSD # 971266301 971266301 971266301 971266301 971266301 <br /> Sample Conc , N D ND N D N D N D <br /> Prepared Date 12/15/97 12/15/97 12/15/97 12/15/97 12/15/97 <br /> Analyzed Date 12/15/97 12/15/97 12/15/97 12/15/97 12/15/97 <br /> Instrument I.D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc. Spiked 10 ug/L 10 pg/L 10 ug/L 30pg/L 60 Ng/L <br /> Result 85 86 85 24 74 <br /> MS % Recovery 85 86 85 80 123 <br /> Dup. Result 82 83 83 23 72 <br /> MSD % Recov 82 83 83 77 120 <br /> RPD 36 36 24 43 27 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK121597 BLK121597 BLK121597 BLK121597 BLK121597 <br /> Prepared Date 12/15/97 12/15/97 12/15/97 12/15/97 12/15/97 <br /> Analyzed Date 12/15/97 12/15/97 12/15/97 12/15/97 12/15/97 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10ug/L 10pg/L iQpg/L 30lig/L 60lig/L <br /> LCS Result 74 75 75 21 65 <br /> LCS % Recov 74 75 75 70 108 <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 /> 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 enure 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 /> JPel' ner <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,APD=Relative% Difference 9712358 SLA <5> <br />