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Sequoia 680 Chesapeake Drive Redwood City, CA(415) 364.9600 FAX (415) 364-9233 <br />a—) 404 N. Wiget Lane Walnut Creek, CA (510) 988-9600 FAX (510) 988-9673 <br />Analytical 819 Striker Avenue, Suite 8 Sacramento, CA 9583 (916) 921-9600 FAX (916) 921.0100 <br />9616 Micron Ave., Suite 600 <br />Sacramento, CA 95827 <br />Attention: Mindv Patterson <br />Benzene <br />vuveeae ev,vva .v. •eevv eev� <br />MatSoil <br />QC Sample Group 507-0815 <br />Ethyl - <br />Toluene Benzene Xylenes Lead <br />Method: <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 7421 <br />Analy to <br />C. Chapman <br />C. Chapman <br />C. C.hapmarl <br />C. Chapman <br />K. Sarta <br />Concentration <br />Spiked: <br />0.20 mg/kg <br />0.20 mg/kg <br />0.20 mg/kg <br />0.60 mg/kg <br />0.25 mg/kg <br />LCS Batch#: <br />LCS072795 <br />LCS072795 <br />LCS072795 <br />LCS072795 <br />LCS072195 <br />Date Prepared: <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/21/95 <br />Date Analyzed: <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />Instrument I.D.#: <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />SH 1000 <br />LCS % <br />Recovery: <br />94 <br />93 <br />95 <br />94 <br />81 <br />Control Limits: <br />75-125 • <br />75-125 <br />75-125 <br />75-125 <br />80.120 <br />MS/MSD <br />Batch #: <br />5070747 <br />5070747 <br />5070747 <br />5070747 <br />5070815 <br />Date Prepared: <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/21/95 <br />Date Analyzed: <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />7/27/95 <br />instrument I.D.: <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />SH 'i000 <br />Matrix Spike <br />% Recovery: <br />96 <br />94 <br />100 <br />100 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />94 <br />96 <br />96 <br />97 <br />Relative % <br />Difference: <br />2.1 <br />2.1 <br />4.1 <br />3.0 <br />Janet flan <br />Project Manager <br />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/MSD's are advisory only <br />and are not used to accept or reject batch results. *Matrix interference. <br />5070815.BRS <3> <br />