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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364.9600 FAX(415) 364-9233 4 a404 N.Wiget Lane Walnut Creek,CA 94598 (510) '988-9600 FAX(510)988.9673 Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX(916)921-0100 :Delta Environmental Consultants Client Project ID: Exxon 7-3330, Stockton =;3330 Data Drive Matrix: Liquid Rancho Cordova, CA 95670 .Attention: Keoni Almeida Work Order#: 9507031-02, 03 Reported J Jul 10, 1995 QUALITY CONTROL DATA REPORT Analyte: Benzene Toluene Ethyl Xylenes Benzene OC Batch#: GCO7059513TEX21A GC070595BTEX2IA GC070595BTEX2IA GC070595BTEX21A Anally. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 Prep.. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 Analyst: J. Minkel J.Minkel J. Minkel J. Minkel MS/MSD #: 9506E8406 9506E8406 9506E8406 9506E8406 Sample Conc.: N.D. N.D. N.D. N.D. Prepared Date: 7/5/95 7/5/95 7/5/95 7/5/95 Analyzed Date: 7/5/95 -7/5/95 7/5/95 7/5/95 Instrument I.D.#: GCHP21 GCHP21 GCHP21 GCHP21 Conc. Spiked: 101ig/L 10,ug/L 10 Ng/L 30 pg/L Result: 10 10 9.5 29 MS % Recovery: 100 100 95 97 Dup. Result: 11 11 11 31 MSD % Recov.: 110 110 110 103 RPD: 9.5 9.5 15 6.7 RPD Limit: 0-50 0-50 0-50 0-50 LCS #: Prepared Date: Analyzed Date: Instrument I.D.#: Conc. Spiked: LCS Result: LCS % Recov.: M D LCS 71-133 72-128 72-130 71-120 Control Limits Please Note: The LCS is a control sample of known,interferent-fres matrix that is analyzed using the same reagents, SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix interference,the LCS recovery is to be used to validate the batch. Mike Gregory Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative 4o Difference 9507031.DLT <2}