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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane walnut Creek.CA 94598 (925)988-9600 FAX(925)9SS-9673 <br /> 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)791-1865 FAX(707)792-0342 <br /> Aler-Ayan <br /> - Dublin Client project IO Unocal 88#2859, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding OC Sample Group 9031227-232 Reported Mar 17, 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# 9031227 9031227 9031227 9031227 9031782 <br /> Date Prepared 3/13/99 3/13/99 3/13/99 3/13/99 3/16/99 <br /> Date Analyzed 3/13/99 3/13/99 3/13/99 3/13/99 3/16/99 <br /> Instrument I D # HP 2 HP 2 HP-2 HP 2 GC/MS 2 <br /> Conc Spiked 20pg/L 20ug/L 20ug/L 60ug/L 50,ug,L <br /> Matrix Spike <br /> % Recovery 85 80 85 92 104 <br /> r✓ <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 85 95 100 96 <br /> Relative % <br /> Difference 57 61 11 8 7 59 <br /> LCS Batch# 2LCS031399 2LCS031399 2LCS031399 2LCS031399 LCS031799 <br /> Date Prepared 3/13/99 3/13/99 3/13/99 3/13/99 3/17/99 <br /> Date Analyzed 3/13/99 3/13/99 3/13/99 3/13/99 3/17/99 <br /> Instrument I D # HP 2 HP-2 HP-2 HP-2 GC/MS-2 <br /> LCS % <br /> Recovery 95 85 90 100 96 <br /> Recovery <br /> Control Limits 70-130 70130 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 /> lianne <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes frons the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recove Is to be used to validate the batch <br /> Fegley <br /> Project Manager <br /> 9031227 GET <4> <br />