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I <br /> �I <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364.9600 FAX(4t5) 364.9233 <br /> 404 N-Wigct Lane Walnut Creck,CA 94598 (510) 9889600 FAX(510)988-%73 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (9t6) 921.9600 FAX(916)92E-0100 <br /> r. <br /> Pacific E=nvironmental Group ClientProjectID. 930-035.21 %2093, Tracy' <br /> { '::2025 Gateway Place, Suite 440 Matrix: LIQUID <br /> } San.lose, CA 95110 <br /> Attention: Greg Barclay Work Order# 9604P19 07 Reported <br /> :.::.:.:::....: ..::........�. May 8, 1998 <br /> l0 i <br /> QUALITY CONTROL DATA REPORT <br /> F <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene I <br /> QC Batch#: GCG42996STEX17A GC0429968TEX17A GCO429WBTEX17A GC042996BTEX17A <br /> Ana ly. Method: EPA 8024 EPA 8020 EPA 8020.7 EPA 8020 <br /> Prep. Method: FPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> F <br /> Analyst: J.Woo J.Woo J.Woo J.Woo <br /> MS/MSD#: 9604E8203 9604E8203 9604Ea203' 9604E8203 <br /> Sample Conc: N.D. N.D. N.D. N.Q. <br /> Prepared Date: 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date: 4/29/96 4/29/96 4/29/96 4/29/96 <br /> t Instrument I.D.#: GCHP17 GCHP17 GCHP17 ' GCHP17 <br /> Conc. Spiked: 14 pg/L 10 pg/L 10,ug/L 30 Erg/L <br /> Result: 8.2 8.1 8.1 25 <br /> MS % Recovery: 82 81 81 83 <br /> Dup. Result: 8.9 8.9 9.0 26 <br /> ff MSD % Recov.: 89 89 90 87 <br /> RPD: 8.2 9.4 11 3.9 <br /> RPD Limit: 0-25 4-25 0.25 0-25 <br /> i <br /> is <br /> : . ::::::,:::::,:.:c.�<:::.�,:- <br /> :::�..--:::::.::::;::.;;::.... ..:::.::::o;:i: <br /> ...:.x.::::::::::::::,:.::.:�:.. ............. :;o-:. <br /> LCS#: BLK042996 BLK042996 BLK042M BLK042996 <br /> Prepared Date: 4/29/96 4/29/96 4/29/96 ., i 4/x9/96 <br /> Analyzed Date: 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Instrument I.D.#: GCHP17 GCHP17 GCHP17 :, i. GCHP17 <br /> Conc. Spiked: 14Y8/L 10Yg/L 14Y9lL <br /> 30 Y9/L <br /> LCS Result: 9.1 9.1 9.0 31 <br /> LCS % Recov.: 91 9t 90 103 <br /> t x <br /> 60-140 60-140 60-144 60-140 <br /> LCS 70-134 70-130 70-130 70-130 <br /> Control Limits <br /> Quality Assurance Statement: All standard operating procedures and quality control requirements have been met. <br /> Please Note: <br /> The LCS is a control sample of known,interferent-free 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. tf { <br /> he recovery of analytes from the matrix spike does not fall within specified control limits due to matrix i <br /> interference,the LCS recovery is to be'used to validate the batch. <br /> k -fia Hirotsu <br /> Manager ••MS=Matrix Spike.MSD MS Duplicate.,RPo=Relative%Difference 9604P19.PPP :2> <br /> 5 <br />