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Sequoia 660 Chesapeake Drive Redwood City,CA 940W (415) 364-9600 FAX(q 15) 364-9233 <br /> ''tires 1 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988.9600 FAX(510)988-9673 <br /> Analytical <br /> alytica1 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> 11 1 ' <br /> ................ <br /> 0eirifeider Client Project ID. 203937 01 <br /> 2825 East Myrtle 5t. Matrix: SoilXX <br /> Stockton, CA 95205 <br /> Attention: Tony Martin QC Sample Group 6071239-40, 43, 46, 49-50 Reported: Aug 8, 1996;'; <br /> ..... <br /> QUALITY CONTROL DATA REPORT <br /> #### ANALYTE Ethyl- <br /> LBenzene Toluene Benzene Xylenes Diesel Diesel <br /> 3 Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M EPA 8015M <br /> Analyst: CL/BW CL/BW CL/BW CL/BW C.Lee C.Lee <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg &20mg/k9 0.60 mg/kg 7.5 mg/kg 7.5 mg/kg <br /> L11 <br /> LCS Batch#: LCS073096 LCS073096 LCS073096 LCS073096 LCS080196 LCSD80296 <br /> Date Prepared: 07/30/96 07/30/96 07/30/96 07/30/96 08/01/96 08/02/96 <br /> Date Analyzed: 07/30/96 07/30/96 07/30/96 07/30/96 08/01/96 08/02/96 <br /> Instrument I.D.#: GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-3B GCHP-3B <br /> LLCS <br /> Recovery: 96 96 95 95 95 93 <br /> Control Limits: 75-125 75-125 75-125 75-125 60-130 60-130 <br /> * MS/MSD <br /> Batch #: 6071314 6071314 6071314 6071314 6071240 6071200 <br /> Date Prepared: 07/30/96 07/30/96 07/30/96 07/30/96 08/01/96 07/29/96 <br /> Date Analyzed: 07/30/96 07/30/96 07/30/96 07/30/96 08/01/96 07/29/96 <br /> Instrument I.D.#: GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-3B GCHP-3B <br /> Matrix Spike <br /> L % Recovery: 94 99 98 99 100 33* <br /> Matrix Spike <br /> ' Duplicate % <br /> Recovery: 104 105 104 105 107 42* <br /> • Relative% <br /> Difference: 10 5.9 5.9 5.9 6.8 24 <br /> SEQUOIA ANALYTICAL Please[vote: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> / �f preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> Lvalidation 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. 'Matrix interference. <br /> Project Manager/Sacramento Laboratory <br /> 6071239.KLF <22> <br />