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Sequoia 660 Chesapeake Dnvc Redwood City,CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 404 N Weget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> tvAnalytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 971 9600 FAX(916)911 Woo <br /> Kleinfelder Ghent Project 10 20-3941-01 I=01 <br /> 2825 East Myrtle St Matrix Sail <br /> Stockton, CA 95205 <br /> Attention Tony Martin QC Sample Group 6061257-58,60-61, 64, 67, 70-71 Reported Jul 15, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X {enes Diesel <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <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 7 5 mg/kg <br /> LCS Batch# LCS070196 LCS070196 LCS070196 LC8070196 LCS070296A <br /> Date Prepared 07/01/96 07/01/96 07/01/96 07/01/'96 07/02/96 <br /> Date Analyzed 07/01/96 07/01/96 07/01/96 07/01/96 07/03/96 <br /> Instrument I D #. GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-38 <br /> LCS <br /> Recovery 85 91 97 98 124 <br /> Control Limits 75 125 75 125 75 125 75-125 60-130 <br /> MS/MSD <br /> Batch # 6060914 6060914 6050914 6060914 6061355 <br /> Date Prepared 07/01/96 07/01/96 07/01/96 07/01/96 06/30/96 <br /> Date Analyzed 07/01/96 07/01/96 07/01/96 07/01/96 06/30/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP 1 GCHP-35 <br /> Matrix Spike <br /> % Recovery 78 90 95 97 104 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 76 85 83 84 100 <br /> Relative % <br /> Difference 26 57 13 14 39 <br /> SEQUOIA ANALYTICAL. Please Note <br /> The LCS is a control sample of known,rnterferent 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 /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6061257 KLF <9> <br />