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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 12)' 404 N Wiget Lane Walnut Cmck CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 OIOo <br /> Kleinfelder Client Project ID 20-3941-01 X01 <br /> 2825 East Myrtle St Matrix Soil <br /> Stockton, CA 95205 <br /> Attention Tony Martin QC Sample Group 6060919-1001 Reported Jul 10, 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 B Williams B Williams B Williams B Williams <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS062796 LCS062796 LCS062796 LCS062796 <br /> Date Prepared 06/27/96 06/27/96 06/27/96 06/27/96 <br /> Date Analyzed 06/27/96 06/27/96 06/27/96 06/27/96 <br /> Instrument I D # GCHP 1 GCHP 1 GCHP-1 GCHP 1 <br /> LCS % <br /> Recovery 83 89 94 96 <br /> Control Limits 75 125 75-125 75-125 75 125 <br /> MS/MSD <br /> Batch # 6060946 6060946 6060946 6060946 <br /> Date Prepared 06/27/96 06/27/96 06/27/96 06/27/96 <br /> Date Analyzed 06/27/96 06/27/96 06/27/96 06/27/96 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP 1 GCHP 1 <br /> Matrix Spike <br /> % Recovery 82 86 89 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 80 84 88 90 <br /> Relative% <br /> Difference 25 24 11 00 <br /> EQUOIA ANALYTICAL Please Note <br /> .gmSThe LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> inda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 6060973 KLF <12> <br />