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u� r, <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wsget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> ,q) 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> ,,1,� Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792-0342 <br /> 1551 industrial Road San Cartos CA 94070-4111 (650)232 9600 FAX(650)232 9612 <br /> I*Gettler-Ryan -Dublin Client Project ID Unocal $S#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# 9060370 9060370 9060370 9060370 <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-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20ug/L 20jig/L 20}tg/L 60ug/L <br /> Matrix Spike <br /> % Recovery 105 85 90 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 90 95 100 <br /> Relative% <br /> Difference 47 57 54 00 <br /> LCS Batch# 4LCS060999 4LCS060999 4LCS060999 4LCS060999 <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-4 HP-4 HP 4 HP 4 <br /> LCS % <br /> Recovery 105 90 90 105 <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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <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 /> Julianne Fegley <br /> Project Manager <br /> 9060540 GET <30> <br />