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Sequoia <br />Analytical <br />3164 Gold Camp Dr., Suite 200 <br />Rancho Cordova, CA 95670 <br />Attention: Eric Holm <br />•680 Chesapeake Drive Redwood City, CA 9406415) 364-9600 FAX (415) 364-9233 <br />404 N. Wiget Lane Walnut Creek, CA 94598 (510) 988.9600 FAX (510) 988-9673 <br />819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX (916) 921-0100 <br />Matrix: Soil <br />OC Sample Group 5071405-7,11-13 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Ethyl - <br />Benzene Toluene Benzene Xylenes <br />Reported: Aug 4, 1995 <br />Method: <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />Analyst: <br />C. Chapman <br />C. Chapman <br />C. Chapman <br />C. Chapman <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 />LCS Batch#: <br />LCS073195 <br />LCS073195 <br />LCS073195 <br />LCS073195 <br />Date Prepared: <br />7/31/95 <br />7/31/95 <br />7/31/95 <br />7/31/95 <br />Date Analyzed: <br />7/31/95 <br />7/31/95 <br />7/31/95 <br />7/31/95 <br />Instrument I.D.#: <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />LCS % <br />Recovery: <br />101 <br />103 <br />101 <br />105 <br />Control Limits: <br />75-125 <br />75-125 <br />75-125 <br />75-125 <br />MS/MSD <br />Batch #: <br />5071030 <br />5071030 <br />5071030 <br />5071030 <br />Date Prepared: <br />7/31/95 <br />7/31/95 <br />7/31/95 <br />7/31/95 <br />Date Analyzed: <br />7/31/95 <br />7/31/95 <br />7/31/95 <br />7/31/95 <br />Instrument I.D.#: <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />GCHP-1 <br />Matrix Spike <br />% Recovery: <br />79 <br />86 <br />86 <br />95 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />90 <br />94 <br />94 <br />100 <br />Relative % <br />Difference: <br />13 <br />8.8 <br />8.8 <br />5.1 <br />SEQUOIA ANALYTICAL <br />i <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. <br />,1• <br />5071405.DLT <3> <br />