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Sequoia 680 Chesapeake Drive Redwood City, CA 94*(415) 364-9600 FAX (415) 364-9233 <br />4D 404 N. Wiaet Lane Walnut Creek, CA 94598 (510) 988-9600 FAX (510) 988-9673 <br />woAnalytical 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX (916) 921-0100 <br />G:.oStrate ies Ir c:«:>::>i::>......................CI'ient"Pro'ect:.j;D:.:.:.::.;:llNO 'AL;:.j:.>:.;::.>:.;;:.;_:::p.:.:.:.;:.:.:....:.>::;::::::<.;:.:::.::>::::::>:::::.;:::::::::>::<.::>::>:::>:<::::: <br />e g C osco <br />3164 Gold Camp Dr., Suite 240 Matrix: Soil <br />Rancho Cordova, CA 95670 <br />Attention: Greg Gurss QC Sample Group: 705-0337 Reported: May 21, 1991 <br />ANALYTE <br />Cadmium Chromium Lead Nickel Zinc <br />Method: <br />EPA 6010 <br />EPA 6010 <br />EPA 6010 <br />EPA 6010 <br />EPA 6010 <br />Analyst: <br />K. Marchand <br />K. Marchand <br />K. Marchand <br />K. Marchand <br />K. Marchand <br />Concentration <br />Spiked: <br />50 mg/kg <br />50 mg/kg <br />50 mg/kg <br />50 mg/kg <br />50 mg/kg <br />LCS Batch#:. <br />LCS051997 <br />LCS051997 <br />LCS051997 <br />LCS051997 <br />LCS051997 <br />Date Prepared: <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />Date Analyzed: <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />Instrument I.D.#: <br />ICP -1 <br />ICP -1 <br />ICP -1 <br />ICP -1 <br />ICP -1 <br />LCS % <br />Recovery: <br />96 <br />96 <br />98 <br />98 <br />95 <br />Control Limits: <br />80-120 <br />80-120 <br />80-120 <br />80-120 <br />80-120 <br />MS/MSD <br />Batch #: <br />7050356 <br />7050356 <br />7050356 <br />7050356 <br />7050356 <br />Date Prepared: <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />Date Analyzed: <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />05/19/97 <br />Instrument I.D.#: <br />ICP -1 <br />ICP -1 <br />ICP -1 <br />ICP -1 <br />ICP -1 <br />Matrix Spike <br />% Recovery: <br />78 <br />76 <br />47 <br />84 <br />92 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />75 <br />66 <br />51 <br />69 <br />192 <br />Relative % <br />Difference: <br />3.9* <br />14* <br />8.2* <br />20* <br />70* <br />*Matrix interference <br />SEQUOIA ANALYTICAL <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. <br />Edana M. Fruciano <br />Project Manager/Sacramento Laboratory <br />7050337.GSI <12> <br />