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* Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364.9600 FAX(415) 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(916)921-0100 <br /> *lton Geoscience -343 <br /> 0-A Lindbergh Ave. Matrix: Liquid <br /> Livermore, CA 94550 <br /> Attention: Ailsa LeMay GSC Sample Group: 6041156-6041166 <br /> Reported: May 1996$> <br /> ..:::.:........... .. <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> QC Batch#: GCO42496 GCO42496 GCO42496 GCO42496 SP041796 <br /> 802002A 802002A 802002A 802002A 8015EXA <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 Mod. <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3510 <br /> Analyst: L. Huang L.Huang L. Huang L.Huang J.Dinsay <br /> MS/MSD#: 6041112 6041112 6041112 6041112 BLK041796 <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> Prepared Date: 4/24/96 4/24/96 4/24/96 4/24/96 4/17/96 <br /> Analyzed Date: 4/24/96 4/24/96 4/24/96 4/24/96 4/17/96 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 HP-3A <br /> Conc. Spiked: 20jig/L 20Ng/L 20ug/L 60frg/L 300 pg/L <br /> Result: 23 22 23 68 250 <br /> MS % Recovery: 115 110 115 113 83 <br /> Dup. Result: 23 22 23 69 280 <br /> MSD % Recov.: 115 110 115 115 93 <br /> RPD: 0.0 0.0 0.0 1.5 11 <br /> RPD Limit: 0-20 0-20 0.20 0-20 0-50 <br /> LCS#: 2LCSO42496 2LCSO42496 2LCSO42496 2LCSO42496 LCSO41796 <br /> Prepared Date: 4/24/96 4/24/96 4/24/96 4/24/96 4/17/96 <br /> Analyzed Date: 4/24/96 4/24/96 4/24/96 4/24/96 4/17/96 <br /> Instrument l.D.#: HP-2 HP-2 HP-2 HP-2 HP-3A <br /> Conc. Spiked: 20ftg/L 20ug/L 20Ng/L 60ug/L 300,ug/L <br /> LCS Result: 22 21 22 67 240 <br /> LCS % Recov.: 110 105 110 112 80 <br /> LCS 70-130 70.130 70-130 70-130 50-150 <br /> Control Limits <br /> Please Note: <br /> The LCS is a control sample of known,interferent-fres matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 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 /> • f _ / the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> I interference,the LCS recovery is to be used to validate the batch. <br /> tCevin Van Slambrook **MS-Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager <br /> 6041156.ALT <7> <br />