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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 Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Kleinfelder Client Project lid 20-3941-01 501 <br /> 2825 East Myrtle St Matrix Water <br /> Stockton, CA 95205 <br /> Attention Tony Martm QC Sample Group 6060919-1001 Reported Jul 10, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA8020 Method EPA 8020 80 0 EPA 8020 EPA 8020 <br /> Analyst V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS062596 LCS062596 LCS062596 LCS062596 <br /> Date Prepared 06/25/96 06/25/96 06/25/96 06/25/96 <br /> Date Analyzed 06/25/96 06/25/96 06/25/96 06/25/96 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP 2 GCHP-2 <br /> • LCS % <br /> Recovery 94 97 99 100 <br /> Control Limits 75-125 75 125 75 125 75-125 <br /> MS/MSD <br /> Batch # 6060919 6060919 6060919 6060919 <br /> Date Prepared 06/25/96 06/25/96 06/25/96 06/25/96 <br /> Date Analyzed 06/25/96 06/25/96 06/25/96 06/25/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 93 97 96 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 92 94 96 97 <br /> Relative% <br /> Difference 11 31 00 42 <br /> ,IgEQUOIA ANALYTICAL Please Note <br /> The LCS 1s 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 /> 7Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6060973 KLF <16> <br />