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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> • J 404 N Wiget Lane Walnut Creek CA 94598 (510) 986 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 <br /> Kleinfelder Client Project IG 20-3941-01 501 <br /> 2825 East Myrtle 5t Matrix So11 <br /> Stockton, CA 95205 <br /> Attention Tony Martin CC Sample Groep 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 Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 6020 EPA 6010 <br /> Analyst CL/BW CL/BW CL/BW CL/BW K Barts <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg <br /> LCS Batch# LCS070896 LCS070896 LCS070896 LCS070696 LCS070396A <br /> Date Prepared 07/08/96 07/08/96 07/08/96 07/08/96 07/03/96 <br /> Date Analyzed 07/08/96 07/08/96 07/08/96 07/08/96 07/05/96 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP 1 GCHP I ICP-1 <br /> LCS <br /> • Recovery 94 96 97 98 106 <br /> Control Limits 75-125 75-125 75 125 75-125 80-120 <br /> MS/MSD <br /> Batch # 6061270 6061270 6061270 6061270 6070011 <br /> Date Prepared 07/08/96 07/08/96 07/08/96 07/08/96 07/03/96 <br /> Date Analyzed 07/08/96 07/08/96 07/08/96 07/08/96 07/05/96 <br /> Instrument I D # GCHP 1 GCHP-1 GCHP-1 GCHP-1 ICP-1 <br /> Matrix Spike <br /> % Recovery 75 86 88 92 74 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 77 82 83 86 69 <br /> Relative <br /> Difference 26 4 8 58 67 69 <br /> EQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> valodation of sample batch results Due to matrix effects,the QC limits for MS/MSO s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Protect Manager/Sacramento Labors ory <br /> 6061257 KLF <10> <br />