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• <br /> 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 /> 1%jr Analytical 819 Stoker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0341 <br /> gftettler-Ryan - Dublin Client Project ID Unocal 88#5886, Stockton <br /> W747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9030233-244 Reported Mar 24, 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# 9030149 9030149 9030149 9030149 <br /> Date Prepared 3/191,99 3/9/99 3/9/99 3/9/99 <br /> Date Analyzed 3/9/99 3/9/99 3/9/99 3/9/99 <br /> Instrument I D # HP 5 HP 5 HP 5 HP 5 <br /> Conc Spiked 20ug/L 20pg/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 110 105 105 107 <br /> isMatrix Spike <br /> Duplicate % <br /> Recovery 120 115 110 115 <br /> Relative % <br /> Difference 87 91 47 75 <br /> LCS Batch# 5LCS030999 5LCS030999 5LCS030999 5LCS030999 <br /> Date Prepared 3/9/99 3/9/99 3/9/99 3/9/99 <br /> Date Analyzed 3/9/99 3/9/99 3/9/99 3/9/99 <br /> Instrument I D # HP-5 HP 5 HP-5 HP 5 <br /> LCS % <br /> Recovery 100 105 105 108 <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, #2279 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 It <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 /> ullanne Fegley <br /> roject Manager <br /> 9030233 GET <18> <br />