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` e , Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> Analytical <br /> 404 N.Wiget Lane Walnut Creek, CA 94598 (510) 988-96Q0 FAX(510) 988-9673 <br /> [� a 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX (916)921.0100 <br /> alta Env!rorirrleniii Consultants Client Project ID: Exxon #7-3330, Stockton, CA" <br /> 3164 Gold Camp Dr., Suite 200 Matrix. Water <br /> j Rancho Cordova, CA 95670 <br /> Attention: C. Keoni Almeida QC Sample Group 5111441-44 Reported: Dec 1, 11995::` <br /> E. XX :';: <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: 8.Williams B.Williams B.Williams B.Williams <br /> Concentration <br /> Spiked: 10 mg/L 10 pg/L 10 ug/L 30 Ng/L <br /> LCS Batch#: LCS112895 LCS112895 LCS112895 LCS 112,995 <br /> Date Prepared: 11/28/95 11/28/95 11/28/95 11/288/95 <br /> Date Analyzed: 11/28/95 11/28/95 11/28/95 11/28/95 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 102 102 103 104 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #: 5111323 5111323 5111323 5111323 <br /> Date Prepared: 11/28/95 11/28/95 11/28/95 11/28/95 <br /> Date Analyzed: 11/28/95 11/28/95 11/28/95 11/28/95 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 92 92 94 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 99 98 98 97 <br /> Relative % <br /> Difference: 7.3 6.3 4.2 7.4 <br /> SEQUOIA ANALYTICAL Please Note: <br /> The LCS is a control sample of known, interferent free matrix that is anaiyzed using the same reagents, <br /> / preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> l� validation of sample batch results. Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C. Schneider and are not used to accept or reject batch results. <br /> / Project Manager 5111441.DLT <2> <br />