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Sl <br /> ` Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 986 9600 FAX(510)98$ 9673 <br /> q1W Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 <br /> EMCON Client Project ID Arco 548, Stockton, CA <br /> 1433 N Market Blvd Matrix Soil <br /> Sacramento, CA 95834 <br /> Attention Mark Capps QC Sample Group 8020348-0361 Reported Feb 24, 1998 <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 C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS021796 LCS021798 LCS021798 LCS021798 <br /> Date Prepared 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Date Analyzed 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery 94 95 95 96 <br /> Control Limits 70 130% 70130% 70130% 70130% <br /> MS/MSD <br /> Batch # 8020350 8020350 8020350 8020350 <br /> Date Prepared 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Date Analyzed 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Instrument I D # GCHP 1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 89 92 92 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 88 86 92 92 <br /> Relative % <br /> Difference 1 1 44 00 1 1 <br /> U ]A ANALYTICAL Please Note <br /> I The 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/MSDs are advisory only <br /> Ronald W Bobel and are not used to accept or reject batch results <br /> Profect Manager/Sacramento Laboratory <br /> 8020348 EMC 7: <br />