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r <br /> y 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 4G4 N W1get Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> � Analytical 819 Sinker Avenue Suite B 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)792-0342 <br />'ttler-Ryan- Dublin ry Client Project ID Unocal SS#0123,Tracy N <br /> 47 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding OC 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 8020 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 9032012 9032012 9032012 9032012 <br /> Date Prepared 3/27/99 3/27199 3/27199 3/27/99 <br /> Date Analyzed 3/27/99 3/27/99 3/27/99 3/27/99 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20ug/L 20jig/L 20Ng/L 60ug/L <br /> Matrix Spike <br /> % Recovery 125 90 125 129 <br />. Matrix Spike <br /> Duplicate % <br /> Recovery 135 95 130 132 <br /> Relative % <br /> Difference 77 54 39 2 0 <br /> LCS Batch# SLCS032799 5LCS032799 5LCS032799 5LCS032799 <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-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery" 115 115 115 120 <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 It <br /> �jyYy� 'Z=o� 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 /> 1lanne Fegley <br /> Project Manager <br /> 9031666 GET <11> <br /> 1>� <br />