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680 Chesapeake Drive Redwood City,CA 940%.10) (415) 364-9600 FAX(415) 364-9233 <br /> L Sequoia U : <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 (9 6) 921-9600 FAX(916)921-()100 <br /> Kleinfelder Client Project ID: 20-3937-01 <br /> 2825 East Myrtle St. Matrix: Soil <br /> Stockton, CA 95205 <br /> Attention: Tony Martin QC Sample Group 6071228-29, 31, 34, 37-38 Reported: Aug 8, 1996 <br /> . ......... <br /> L <br /> QUALITY CONTROL DATA REPORT <br /> L <br /> ANALYTE Benzene Ethyl- <br /> Toluene Benzene Xy[enes <br /> Ll <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> L Analyst: CL/BW CL/BW cl-lbw CL/BW <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> LCS Batch#: LCS073096 LCS073096 LCS073096 LCS073096 <br /> LDatePrepared: 07/30/96 07/30/96 07/30/96 07/30/96 <br /> Date Analyzed: 07/30/96 07/30/96 07/30/96 07/30/96 <br /> Instrument I.D.#: GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> L Recovery: 96 96 95 96 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #: 6071314 6071314 6071314 6071314 <br /> Date Prepared: 07/30/96 07/30/96 07/30/96 07/30/96 <br /> LDate Analyzed: 07/30/96 07/30/96 07/30/96 07/30/96 <br /> Instrument I.D.#: GGHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> L % Recovery: 94 99 98 99 <br /> Matrix Spike <br /> Duplicate% <br /> L Recovery: 104 105 104 105 <br /> Relative % <br /> L Difference: 10 5.9 5.9 5.9 <br /> LSEQUOIA ANALYTICAL Please Note: z rn <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagent <br /> ' preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> validation of-sample batch results. Oue to matrix effects,the QC limits for MS/MSG's are advisory only <br /> Linda C. Schneider and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Labo—FaTUT— 6071228.KLF <23> <br />