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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)92 1.O 100 <br /> XX <br /> Delta Environmental Consultants Client Project ID: Exxon 7-3330, Stockton <br /> 3330 Data Drive Matrix: Liquid <br /> ,..'Rancho Cordova, CA 95670 <br /> :::::Attention: Keoni Almeida. Work Order #: 9507031 -01 Reported: Jul 10, 1995'." <br /> X -X. <br /> QUALITY CONTROL DATA REPORT <br /> Analyte; Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch* GC070595BTEX20A G0070595BTEX20A GCO70595BTEX20A GCO70595BTEX20A <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 #: 9506E84M 9506E8406 9506EB406 9506ES406 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 7/5/95 7/5/95 7/5/95 7/5/95 <br /> Analyzed Date: 7/5/95 7/5/95 7/5/95 7/5/95 <br /> Instrument I.D.* GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc. Spiked: 10pg/L 10,ug/L 1 0,ug/L 30,ug/L <br /> Result: 11 11 11 32 <br /> MS % Recovery: 110 110 110 107 <br /> Dup. Result: 11 11 11 32 <br /> MSD % Recov.: 110 110 110 107 <br /> RPD: 0.0 0.0 0.0 0.0 <br /> RPD Limit: 0-50 0-50 0-50 0-50 <br /> ... . .... <br /> n. <br /> .... ...... 1. <br /> LCS #: <br /> Prepared Date: <br /> Analyzed Date: <br /> Instrument I.D.#: <br /> Conc. Spiked: <br /> LCS Result: <br /> LCS % Recov.. <br /> MS/M95 <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 /> linterference,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 9507031.[)LT <1> <br />