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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 ; <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455'McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232 9600 FAX(650)232-9612 <br /> ettler-Ryan - Dublin Client Project ID Tosco SS#6981,'Stockton w <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9941854-868 Reported May 14, 1999 <br /> i <br /> J QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> i <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 9041729 9041729 9041729 9041729 <br /> Date Prepared 4/28/99 4/28/99 4/28/99 4/28/99 <br /> Date Analyzed 4/28/99 4/28/99 4/28/99 4/28/99 <br /> Instrument 1.10 # HP-9 HP-9 HP-9 HP 9 <br /> Cone Spiked 2ovg/L 2opg/L 20pg/L 60,ug/L <br /> Matrix Spike <br /> % Recovery 100 105 105 102 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery loll 105 105 105 <br /> Relative% <br /> Ditlerence• 00 00 00 32 <br /> LCS Batch#' 9LCSO42899 9LCSO42899 9LCSO42899 9LCSO42899 <br /> Date Prepared 4/28/99 4/28/99 4/28/99 4/28/99 <br /> Date Analyzed 4/28/99 4/28/99 4/28/99 4/28/99 <br /> Instrument I D# HP-9 HP-9 HP-9 HP 9 <br /> w <br /> jLCS % <br /> Recovery: 90 95 100 97 <br /> Recovery <br /> Control Limits 70-130 - 70-130 70-130 70-130 <br /> Please Note <br /> iW a ,,The LCS is a control sample of known,interferent fres matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL,#1271-- 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 If <br /> the recovery of analytes from the matrix spike does not fall within specif led control limits due to matrix <br /> Interference,the LCS recoveryis to be used to validate the batch <br /> Jullanne Fegley <br /> Project Manager <br /> 9041854 GET <19> <br />