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1 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> *"5�i <br /> 404 N Wigct Lane Walnut Creek 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 0100 <br /> EWCON 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 8020243-0248 Reported Mar 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl_ <br /> Benzene Toluene Benzene Xylenes Diesel <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 DHS LUF F <br /> Analyst C Lee 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 12 5 mg/kg <br /> LCS Batch# LCS021298 LCS021298 LCS021298 LCS021298 LCS021798 <br /> Date Prepared 02/12/98 02/12/98 02/12/98 02/12/98 02/17/98 <br /> Date Analyzed 02/12/98 02/12/98 02/12/98 02/12/99 02/17/98 <br /> Instrument I D # 3CHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-38 <br /> LCS <br /> Recovery 99 101 101 100 98 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 60-140% <br /> MS/MSD <br /> Batch# 8020230 8020230 8020230 8020230 8020302 <br /> Date Prepared 02/12/98 02/12/98 02/12/98 02/12/98 02/17/98 <br /> Date Analyzed 02/12/98 02/12/98 02/12/98 02/12/98 02/17/98 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP 1 GCHP-1 GCHP-3B <br /> Matrix Spike <br /> % Recovery 78 80 81 82 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 82 84 84 85 102 <br /> Relative% <br /> Difference 50 49 36 36 4 0 <br /> aQUOIA ANALYTICAL Please Note <br /> 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/MSD's are advisory only <br /> Ronald W Bobeland are not used to accept or refect batch results <br /> Project Manager/Sacramento Labora ory <br /> 8020243 EMC <15> <br />