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i r <br />' I+ <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 111W 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-t865 FAX(707)792-0342 <br /> ettler-Ryan- bubiln Client Project ID Unocal 88#5417, Manteca <br /> 747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9022174-177 Reported Mar 10, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst C Westwater C Westwater C Westwater C Westwater N Nelson <br /> MS/MSD <br /> Batch# 9022175 9022175 9022175 9022175 9022175 <br /> Date Prepared 3/4/99 3/4/99 3/4/99 3/4/99 3/5/99 <br /> Date Analyzed 3/4/99 3/4/99 3/4/99 3/4/99 3/5/99 <br /> Instrument 1 D # HP-4 HP 4 HP 4 HP 4 GC/MS 2 <br /> Conc Spiked 20yg/L 20pg/L 20ug/L 60ug/L 50pg/L <br /> Matrix Spike <br /> % Recovery 100 90 90 107 114 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 90 90 105 110 <br /> Relative % <br /> Difference 00 00 00 15 36 <br /> LCS Batch# 4LCS030499 4LCS030499 4LCS030499 4LCS030499 LCS030599 <br /> Date Prepared 3/4/99 3/4/99 3/4/99 3/4/99 3/5/99 <br /> Date Analyzed 3/4/99 3/4/99 3/4/99 3/4/99 3/5/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP 4 GC/MS-2 <br /> LCS % <br /> Recovery 100 90 95 107 110 <br /> Recovery <br /> Control Limits 70-130 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, #1273 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 />* g <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 /> panne Fegley <br /> Project Manager <br /> 9022174 GET <5> <br />