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f , , Sequoia 680 Chesapeake Dnvc Redwood City, Cry 94063 (415) 364.9600 FAX 5415) 364-9233 <br /> 404 N- Wiget Lane Walnut Creek, CA 94598 (510) 988_9600 FAX(510)988-9673 <br /> Analytical 319 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX (916)931-0100 <br /> :.:.::.::: ................. ... .. .... <br /> Delta Environmental Consujtants Client Project ID: Exxon 7-3330. Stockton <br /> :::.3330 Data Drive Matrix: Liquid <br /> Ranc:io Cordova. CA 95870 <br /> .:.Attention: Keoni Almeida Work Order #: 9509111 -01...-03 ...... Reported: l Sep 7 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xyienes <br /> Benzene <br /> QC Hatch#: GC09m95BTEX02A CsCo90595BTEX02A GCO90595BTEX02A GCO905955TEX02A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: J. Minkel J. Minkel J.Minkel J.Minkel <br /> .MS/MSD#: G9509045-018 G9509045-01B G9509045-018 G9509045-01B <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 9/5/95 9/5/95 9/5/95 9/5/95 <br /> Analyzed Date: 9/5/95 9/5/95 9/5/95 9/5/95 <br /> Instrument I.D.#: GCHP2 GCHP2 GCHP2 GCHP2 <br /> Canc. Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result: 9.6 9.4 9.5 29 <br /> MS !; Recovery: 96 94 95 97 <br /> Dup. Result: 9.5 9.5 9.6 29 <br /> MSD % Recov.: 95 95 96 97 <br /> RPD: 1.0 1.1 1.0 0.0 <br /> RPD Limit: 0-50 0-50 0-50 0-50 <br /> LCS#. <br /> Prepared Date: <br /> Analyzed Date: <br /> Instrument I.O.#: <br /> Conc. Spiked: <br /> LCS Result: <br /> LCS % Recov.: <br /> LCS 71-133 72-128 72-130 71-120 <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 /> 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. 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 /> Mike Gregory <br /> Project Manager "MS=Matrix Spike.MSD=MS Duplicate,RPD-Relative%Difference 9509111.DLT <i n <br /> �r� <br />