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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> X1,7 Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Chevron 9-6171, Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9711618 -01-07 Reported Nov 24, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method. EPA 8020 EPA 8020 EPA 6020 EPA 8020 <br /> Analyst: J A. J A J A. JA. <br /> Conc Spiked: 20 20 20 60 <br /> Units. us/L ug/L us/L us/L <br /> LCS Batch# LC$111997 LCS111997 LCS111997 LCS111997 <br /> Date Prepared 11/19/97 11/19/97 11/19/97 11/19/97 <br /> Date Analyzed 11/19/97 11/19/97 11/19/97 11/19/97 <br /> Instrument 1.13 # - - - - <br />. LCS % <br /> Recovery- 103 103 102 108 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch #' LCS111997 LCS111997 LCS111997 LCS111997 <br /> Date Prepared, 11/19/97 11/19/97 11/19/97 11/19/97 <br /> Date Analyzed 11/19/97 11/19/97 11/19/97 11/19/97 <br /> Instrument I D.# - - - - <br /> Matrix Spike <br /> % Recovery- 103 103 102 108 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery. 98 100 100 115 <br /> Relative % <br /> Difference 50 30 2 0 63 <br /> SEQUOIA ANALYTICAL Please Note <br /> Elap# 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 /> �r and are not used to accept or refect batch results <br /> regory <br /> roject Manager 9711618 GET <1> <br />