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Sequoia 680 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(915)988-9673 <br /> Analytical 814 Sulker Avenue Suite 8 Sacramento CA 95834 (916)421-9600 FAX(916)921-0100 � <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0341 <br /> 'ttler-R an -Dublin Client Project ID Unocal SS#0123, *racy <br /> 47 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9031666-672 Reported Apr 2, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8024 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 9031665 9031665 9031665 9031665 <br /> Date Prepared 3/27/99 3/27/99 3/27/99 3/27/99 <br /> Date Analyzed 3/27/99 3/27/99 3/27/99 3/27/99 <br /> Instrument I D # HP-2 HP 2 HP 2 HP 2 <br /> Conic Spiked: 20 Ng/L 20 Fig/L 20 Mg/L 60)t9/L <br /> Matrix Spike <br /> % Recovery 105 105 105 113 <br />. Matrix Spike <br /> Duplicate % <br /> Recovery 115 105 110 118 <br /> Relative % <br /> Difference 91 49 47 43 <br /> LCS Batch# 2LCS032799 2LCS032799 2LCS032799 2LCS032799 <br /> Date Prepared 3/27/99 3/27/99 3/27/99 3/27/99 <br /> Date Analyzed. 3/27/99 3/27/99 3/27/99 3/27/99 <br /> Instrument I D # HP 2 HP 2 HP-2 HP-2 <br /> LCS <br /> Recovery- 110 105 110 118 <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 recove Is to be used to validate the batch <br /> ianne Fegiey <br /> Project Manager <br /> 9031666 GET <10> <br />