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Sequoia 680 Chesapeake Drive Redwood City CA 91063 {650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget 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 /> Tettler-Ryan - Dublin Client Project ID Unocal SS#2859, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9052028-039 Reported May 28, 1999 <br /> DUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <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# 9051572 9051572 9051572 9051572 <br /> Date Prepared 5/25/99 5/25/99 5/25/99 5/25/99 <br /> Date Analyzed 5/25/99 5/25/99 5/25/99 5/25/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP 4 <br /> Conc Spiked 20pg/L 20ug/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 95 80 85 98 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery 95 80 85 100 <br /> Relative % <br /> Difference 00 00 00 17 <br /> LCS Batch# 4LCS052599 4LCS052599 4LCS052599 4LCS052599 <br /> Date Prepared 5/25/99 5/25/99 5/25/99 5/25/99 <br /> Date Analyzed 5/25/99 5/25/99 5/25/99 5/25/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery: 95 80 85 98 <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 tree 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 H <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recov=is to be used to validate the batch <br /> J lianne>=egley <br /> roiect Manager <br /> 9052028 GET a3> <br /> r� <br />