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Sequoia <br />,5)404 <br />18680 Chesapeake Drive <br />Redwood City, CA 9406(415) 364.9600 <br />FAX (415) 364-9233 <br />q1W Analytical <br />N. Wiget Lane <br />819 Striker Avenue, Suite 8 <br />Walnut Creek, CA 94598 (510) 988-9600 <br />Sacramento, CA 95834 (916) 921-9600 <br />FAX (510) 988-9673 <br />FAX (916) 921 -0 100 <br />3164 Gold Camp Dr., Suite 200 Matrix: Soil <br />Rancho Cordova, CA 95670 <br />Attention: Eric Holm QC Sample Group 5071405-7,11-13 Reported: Aug 4, 1995 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Ethyl - <br />Benzene Toluene Benzene Xylenes Diesel <br />Method: <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 8015M <br />Analyst: <br />C. Chapman <br />C. Chapman <br />C. Chapman <br />C. Chapman <br />C. Lee <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 />7.5 mg/kg <br />LCS Batch#: <br />LCS072895 <br />LCS072895 <br />LCS072895 <br />LCS072895 <br />LCS080195 <br />Date Prepared: <br />7/28/95 <br />7/28/95 <br />7/28/95 <br />7/28/95 <br />8/1/95 <br />Date Analyzed: <br />7/28/95 <br />7/28/95 <br />7/28/95 <br />7/28/95 <br />8/3/95 <br />Instrument I.D.#: <br />GCHP-4A <br />GCHP-4A <br />GCHP-4A <br />GCHP-4A <br />GCHP-3B <br />LCS % <br />Recovery: <br />102 <br />101 <br />102 <br />102 <br />113 <br />Control Limits: <br />75-125 <br />75-125 <br />75-125 <br />75-125 <br />50-150 <br />MS/MSD <br />Batch #: <br />5071410 <br />5071410 <br />5071410 <br />5071410 <br />5071412 <br />Date Prepared: <br />7/28/95 <br />7/28/95 <br />7/28/95 <br />7/28/95 <br />8/1/95 <br />Date Analyzed: <br />7/28/95 <br />7/28/95 <br />7/28/95 <br />7/28/95 <br />8/3/95 <br />Instrument I.D.#: <br />GCHP-4A <br />GCHP-4A <br />GCHP-4A <br />GCHP-4A <br />GCHP-3B <br />Matrix Spike <br />% Recovery: <br />81 <br />83 <br />84 <br />90 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />90 <br />92 <br />94 <br />96 <br />Relative % <br />Difference: <br />10 <br />10 <br />11 <br />6.4 <br />SEQUOIA ANALYTICAL <br />' X, <br />Linda C. Schneider <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 />5071405.DLT <4> <br />