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Sequoia 6110 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)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)92I-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North,Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-034Z <br /> 41&ttler-Ryan - Dublin Client Project Ib Unocal SS#5098, Stockton <br /> T47 Sierra Court, Suite J Matrix Liquid <br /> ublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 8122064-072 Reported Jan 13, 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 C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD <br /> Batch# 8122030 8122030 8122030 8122030 <br /> Date Prepared 1/4/99 1/4/99 1/4/99 1/4/99 <br /> Date Analyzed 1/4/99 1/4/99 1/4/99 1/4/99 <br /> Instrument I D # HP-5 HP-5 HP 5 HP-5 <br /> Conc Spiked 20ug/L 20ug/L 20F+g/L 60ug/L <br /> Matrix Spike <br /> % Recovery 100 105 105 108 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 110 110 115 <br /> Relative % <br /> Difference 49 4 7 47 6 0 <br /> LCS Batch# 5LCS010499 5LCS010499 5LCS010499 5LCS010499 <br /> Date Prepared 1/4/99 1/4/99 1/4/99 1/4/99 <br /> Date Analyzed 1/4/99 1/4/99 1/4/99 1/4/99 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 100 105 100 105 <br /> Recovery <br /> Conkrol 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 /> SEANALYTICAL, #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 ff <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> U egle� Enterference,the LCS recovery Is to be used to validate the batch <br /> Project Manager <br /> 8122064 GET <21> <br /> m <br />