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Sequoia680 Chesapeake Dnvc 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 /> �Ily Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Delta Environmental Consultants Client Project ID Exxon #7-3708, Stockton, CA <br /> 3164 Gold Camp Or, Suite 200 Matrix Water <br /> Rancho Cordova, CA 95670 <br /> Attention C Keonl Almeida QC Sample Group 6060074-81 Reported Aug 9, 1996 <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: CL/BW CL/BW CL/BW CL/8W <br /> Concentration <br /> Spiked. 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS080896 LCSGB0896 LC8080896 LCS080896 <br /> Date Prepared 08/08/96 08/08/96 08/08/96 08/08/96 <br /> Date Analyzed 08/08/96 08/08/96 08/08/96 08/08/96 <br /> Instrument LD #• GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery, 100 102 104 105 <br /> Control Limits. 70-130 70-130 70-130 70-130 <br /> v � <br /> MS/MSD <br /> Batch# 6080230 6080230 6080230 6080230 <br /> Date Prepared: 08/08/96 08/08/96 08/08/96 08/08/96 <br /> Date Analyzed. 08/08/96 08/08/96 08/08/96 08/08/96 <br /> Instrument LD # GCHP-1 GCHP-1 GCHP-1 GGHP-1 <br /> Matrix Spike <br /> % Recovery 83 88 88 95 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 88 92 94 99 <br /> Relative % <br /> Difference 58 44 6 6 41 <br /> SEQUOIA ANALYTICAL Please mote <br /> The LCS is a control sample of known interferent free matrix that 1s analyzed using the same reagents <br /> preparation and analytical methods employed for the samples The LCS 16 recovery data is used for <br /> `!PCZ validation of sample batch results Due to matrix effec•s the QC limits for MS/MSD s are advisory only <br /> Anda C SCh eider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6080074 DLT <6> <br /> n� <br />