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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364.9600 FAX(415) 364.9133 <br /> 404 N.Wiget Lane Walnut Creek, CA 94598 (510).988-9600 FAX(510) 988.9673 <br /> WLWAnalytical a19 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921.9600 FAX(916) 921.0100 <br /> Delta Environmental.Consultants Client Project ID Exxon #7-3330, Stockton,CA <br /> >� 3164 Gold Camp Dr., Suite 200 Matrix: Water <br /> Rancho Cordova, CA 95670 <br /> Attention: C. Keoni Almeida QC Sample Group 5111441-44 Reported: Dec 1, 1995:::: <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: B.Williams B.Williams B.Williams B.Williams <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCS112995 LC8112995 LCS112995 LCS112995 <br /> Date Prepared: 11/29/95 11/29/95 11/29/95 11/29/95 <br /> Date Analyzed: 11/29/95 11/29/95 11/29/95 11/29/95 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> . Recovery: 97 98 99 100 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #: BS112995 BS 112995 BS112995 BS112995 <br /> Date Prepared: 11/29/95 11/29/95 11/29/95 11/29/96 <br /> Date Analyzed: 11/29/95 11/29/95 11/29/95 11/29/95 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 91 93 96 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 100 100 100 100 <br /> Relative % <br /> Difference: 9.4 7.3 4.1 7.3 <br /> SEQUOIA ANALYTICAL Please Note: <br /> The LCS is a control sample of known, interterent free matrix that is analyzed using the same reagents, <br /> / I preparation and analytical methods employed for the samples. The LCS 90 recovery data is used for <br /> ;l validation of sample batch results. Due to matrix effects,the CC limits for MS/MSc's are advisory only <br /> Linda C. Schneider and are not used to accept or reject batch results. <br /> Project Manager <br /> 5111441,01-T <37 <br /> �d <br />