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Sequoia 680 Chesapeake Drive 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 /> Analytical 819 Striker Avenuc,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> ' Kleinfelder Client Project ID 20-3941-01 E01 <br /> 2825 East Myrtle St Matrix Sall <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 Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst CL/BW GL/BW CL/BW CL/8W <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> ' LCS Batch# LCS062896 LCS062896 LCS062896 LCS062896 <br /> Date Prepared 06/28/96 06/28/96 06/28/96 06/28/96 <br /> Date Analyzed 06/28/96 06/28/96 06/28/96 06/28/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP 1 <br /> LCS % <br /> Recovery 86 91 100 100 <br /> Control Limits 75-125 75-125 75 125 75 125 <br /> MS/MSD <br /> Batch # 6060973 6060973 6060973 6060973 <br /> Date Prepared 06/28/96 06/28/96 06/28/96 06/28/96 <br /> Date Analyzed 06/28/96 06/28/96 06/28/96 06/28/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 <br /> ' Matrix Spike <br /> %Recovery 71 81 88 90 <br /> Matrix Spike <br /> ' Duplicate% <br /> Recovery 86 88 86 88 <br /> ' Relative% <br /> Difference 19 8 3 23 2 2 <br /> SEQUOIA 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/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 6061257 KLF <8> <br /> .PZ. <br />