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4 4 Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek, CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> IN <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> ,,Gettler Ryan%Geostrategies n Client Project ID Chevron 9-6171, Stockton <br /> ,6747 Sierra Court, Ste J Matrix Liquid <br /> ' Dublin, CA 94568 <br /> YAttention Deanna Harding Work Order# 9611619 -01, 03, 04, 05 Reported Nov 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch#: GC111596BTEX20A GC111596BTEX20A GC111596BTEX20A GC111596BTEX20A <br /> Analy. Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method. EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: G Fish G Fish G Fish G Fish <br /> MS/MSD # 961138812 961138812 961138812 961138812 <br /> Sample Conc : NO N D N D NO <br /> Prepared Date- 11/15/96 11/15/96 11/15/96 11/15/96 <br /> Analyzed Date: 11/15/96 11/15/96 11/15/96 11/15/96 <br /> Instrument 1 D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc. Spiked: 10pg/L 10ug/L 10p9/L 30pg/L <br /> Result- 87 81 83 25 <br /> MS % Recovery- 87 81 83 83 <br /> Dup. Result: Do* 00* 0 0* 00* <br /> MSD % Recov - 0 0 0 0 <br /> RPD 200 200 200 200 <br /> RPD Limit- 0-25 0-25 0-25 0-25 <br /> *MSD-No spike recovery <br /> LCS # BLK111596 BLK111596 BLK111596 BLKf11596 <br /> Prepared Date 11/15/96 11/15/96 11/15/96 11/15/96 <br /> Analyzed Date- 11/15/96 11/15/96 11/15/96 11/15/96 <br /> Instrument I.D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked: 10pg/L lope/L 10pg/L 30p9/L <br /> LCS Result: 85 75 79 23 <br /> LCS % Recov. 85 75 79 77 <br /> M M D 60-140 60-140 <br /> 60-10-0 satao <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 tree matrix that is analyzed using the same reagents, <br />.SEQUOIA NALYTICAL 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 0 <br /> the recovery of analytes from the matrix spike does 4ot fall within specified control limits due to matrix <br /> Interference,the LCS recovery Is to be used to validate the batch <br /> e Gregory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9611619 GET 4 1> <br />