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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364.9600 FAX(650)364-9233 <br /> 404 N. Wiget 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 (9 16)921.0100 <br /> Blairie`tech Services, Inc. Client Project!D Chevron 9-0557 %971124-S2 <br /> 1680 Rogers Ave. Matrix: Liquid <br /> San Jose, CA 95112 <br /> Attention: Fran Thie Work Order #: 9711 G09-06, 08 Reported: Dec 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch#: GC120897BTEX18A GC120897BTEX18A GC120897BTEX18A GC120897BTEX18A GC120897BTEX18A <br /> Analy. Method: EPA 6020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: C. Demartini C. Demartini C. Demartini C. Demartini C. Demartini <br /> MS/MSD #: 971205212 971205212 971205212 971205212 971205212 <br /> Sample Conc: N.D. N.D. N.D. N.D. N.D. <br /> Prepared Date: 12/8/97 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Analyzed Date: 12/8/97 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Instrument I.D.#: GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc. Spiked: 10ug/L loug/L 10pg/L 30ug/L 60pg/L <br /> Result: 8.2 9.3 9.1 28 61 <br /> MS % Recovery: 82 93 91 93 102 <br /> Dup. Result: 8.5 9.4 9.2 29 63 <br /> MSD % Recov.: 85 94 92 97 105 <br /> RPD: 3.6 1.1 1.1 3.5 3.2 <br /> RPD Limit: 0-25 0-25 0-25 0-25 0-25 <br /> xx <br /> LCS #: BLK120897 BLK120897 BLK120897 BLK120897 BLK120897 <br /> Prepared Date: 12/8/97 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Analyzed Date: 12/8/97 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Instrument LD.#: GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc. Spiked: 10Ng/L lopg/L 101tg/L 30pg/L 60Ng/L <br /> LCS Result: 8.3 9.0 9.1 28 61 <br /> LCS % Recov.: 83 90 91 93 102 <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 /> VEILYTICAL 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. 9 <br /> the recovery of analytes from the matrix spike does not tall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch. <br /> er **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9711G09.BLA a3> <br />