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® 1 Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wsget Lane Walnut Creek CA 94598 (510) 938 9600 FAX(510)988 9673 <br /> 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 Work Order # 9608665 -01 -07 Reported Aug 27, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# G10082096BTEX07A GCO82096BTEX07A GCO82096BTEX07A GCO82096BTEX07A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst Porter Porter Porter Porter <br /> MS/MSD # G9608191-02 G9608191-02 G9608191-02 G9608191-02 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 8/20/96 8/20/96 8/20/96 8/20/96 <br /> Analyzed Date 8/20/96 8/20/96 8/20/96 8/20/96 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone Spiked. 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result. 11 11 11 33 <br /> MS % Recovery 110 110 110 110 <br />• Dup Result 10 11 11 32 <br /> MSD % Recov 100 110 110 107 <br /> RPD s5 00 00 31 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # GBLK082096 GBLK082096 GBLK082096 GBLK082096 <br /> Prepared Date 8/20/96 8/20/96 8/20/96 8/20/96 <br /> Analyzed Date 8/20/96 8/20/96 8/20/96 8/20/96 <br /> Instrument LD # GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result 12 12 12 36 <br /> LCS % Recov 120 120 120 120 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA AN LYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure 11 <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> ik Gregory <br /> Project Manager '*MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9608665 GET <1> <br />