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la) 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(916)921-0100 <br /> :::Cambria .: ;...........:<:::_>:;: <br /> Client Project ID: Shell 1267 Country Club Road <br /> ;:'270 Perkins Avenue Matrix: Liquid <br /> <Sonoma, CA 95476 <br /> :Attention: Joe Neely Work Order#: 9802D55-02, 05 Reported: Mar 5, 1998;. <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes - Gas <br /> Benzene <br /> QC Batch#: GC030298BTE)(03A GCO30298BTEX03A GC030298BTEX03A GCO30298STEX03A GCO302988TE(03A <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: C.Demartini C. Demartini C.Demartini C. Demartini C.Demartini <br /> MS/MSD #: 98021-17004 9802H7004 9802H7004 9802H7004 9802H7004 <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> Prepared Date: 3/2/98 3/2/98 3/2/98 3/2/98 3/2/98 <br /> Analyzed Date: 3/2/98 3/2/98 3/2/98 3/2/98 3/2/98 <br /> Instrument I.D.#: GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc. Spiked: iopg/L 10frg/L 10pg/L 30,ug/L 60)rg/L <br /> Result: 9.7 9.6 9.8 30 64 <br /> MS %Recovery: 97 96 98 100 107 <br /> Dup. Result: 9.6 9.5 9.7 30 64 <br /> MSD %Recov.: 96 95 97 100 107 <br /> RPD: 1.0 1.0 1.0 0.0 0.0 <br /> RPD Limit: 0-25 0-25 0-25 0-25 0-25 <br /> LCS #: BLK030298 BLK030298 BLK030298 BLK030296 BLK030298 <br /> Prepared Date: 3/2/98 3/2/98 3/2/98 3/2/98 3/2/98 <br /> Analyzed Date: 3/2/98 3/2/98 3/2/98 3/2/98 3/2/98 <br /> Instrument I.D.#: GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conic. Spiked: 10 ftg/L 10 ftg/L 10)rg/L 30)tg/L 60 Ng/L <br /> LCS Result: 9.9 9.7 9.8 30 65 <br /> LCS % Recov.: 99 97 98 100 108 <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 /> Vory <br /> YTICAL 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. K <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 /> ProjectManager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9802D55.CCC <2> <br />