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i) 4 <br /> • 680 Chesapeake Drive Redwood Ciry CA 94063 (650) 364 9(500 FAX(650)364-9233 <br /> Sequoia J 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)92 t 9600 FAX(916)921-0 100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 -- (650)792-1865 FAX(707)792-9612r <br /> 1551 Industrial Road San Caries CA 94070-41 11 {650}232-9600 FAX(650)232-9612 <br /> Gettler-Ryan- Dublin Client Project ID Unocal SS#5886, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention_ Deanna Harding _ _ OC Sample Group 9060540-560 Reported Jun 17, 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 J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 9060552 9060552 9060552 9060552 <br /> Date Prepared 6/9/99 6/9/99 6/9/99 6/9/99 <br /> Date Analyzed 6/9/99 6/9/99 6/9/99 6/9/99 <br /> Instrument I D # HP-2 HP-2 HP 2 HP 2 <br /> Conic Spiked 20 ug/L 20 jig/L 20 ug/L 60,ug/L <br /> Matrix Spike <br /> % Recovery 95 85 90 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 90 95 105 <br /> Relative % <br /> Difference 10 5 7 54 6 6 <br /> LCS Batch# 2LCS060999 2LCS060999 2LCS060999 2LCS060999 <br /> Date Prepared 6/9/99 6/9/99 6/9/99 6/9/99 <br /> Date Analyzed 6/9/99 6/9/99 6/9/99 6/9/99 <br /> Instrument 10 # HP 2 HP-2 HP 2 HP-2 <br /> LCS % <br /> Recovery 100 90 90 102 <br /> ecovery <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 /> J'A_ fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> u�by�(r' � the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix • <br /> interference,the LCS recoveryis to be used to validate the batch <br /> Julianne egley <br /> Project Manager 9060540 GET <29> <br />