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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 41) 404 N Wlget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> IWO Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> ttler-Ryan -bubliri Client Project lb Unocal 88#5098, Stockton <br /> { 7 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 8122064-072 Reported Jan 13, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD <br /> Batch# 8122037 8122037 8122037 8122037 <br /> Date Prepared 1/5/99 1/5/99 1/5/99 1/5/99 <br /> Date Analyzed 1/5/99 1/5/99 1/5/99 1/5/99 <br /> Instrument 1 D # HP 9 HP-9 HP-9 HP-9 <br /> Conc Spiked 20jig/L 20Ng/L 20p9/L 60,ug/L <br /> Matrix Spike <br /> % Recovery 105 110 115 117 <br /> Matrix Spike <br /> Duplicate % Y <br /> Recovery 100 105 110 112 Il <br /> Relative % <br /> Difference 49 47 44 44 <br /> LCS Batch# 9LCS010599 9LGS010599 9LCS010599 9LCS010599 <br /> Date Prepared 1/5/99 1/5/99 1/5/99 1/5/99 <br /> Date Analyzed 1/5/99 1/5/99 1/5/99 1/5/99 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery 110 115 120 122 <br /> Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> Please Note <br /> The LCS is a control sample of known,interferent free 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 /> ilj� 1 ° fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> �vLt the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> lanae Fegley interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 8122064 GET <22> <br /> T <br />