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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988 9673 <br /> Analytical 819 Striker 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 707 792-0342 <br /> ler-Ryan -Dublin Client Prolect ID Unocal SS#2859, Stockton v <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding CC Sample Group 9031233-238 Reported Mar 16, 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# 9031227 9031227 9031227 9031227 <br /> Date Prepared 3/13/99 3/13/99 31113/99 3/13/99 <br /> Date Analyzed 3/13/99 3/13,99 3/13/99 3/13/99 <br /> Instrument I D # HP 2 HP 2 HP 2 HP 2 <br /> Conc Spiked 20pg/L 20ug/L 20ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery 85 80 85 92 <br /> is Matrix Spike <br /> Duplicate % <br /> Recovery 90 85 95 100 <br /> Relative % <br /> Difference 57 6 1 11 87 <br /> LCS Batch# 2LCS031399 2LCS031399 2LCS031399 2LCS031399 <br /> Date Prepared 3/13/99 3/13/99 3/13/99 3/13/99 <br /> Date Analyzed 3/13/99 3/13/99 3/13/99 3/13/99 <br /> instrument I D # HP 2 HP 2 HP 2 HP 2 <br /> LCS % <br /> Recovery 95 85 90 100 <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 /> OU 01A 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 11 <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrixve <br /> interference,the LCS recois to be used to validate the batch <br /> Janne Fegley <br /> Project Manager <br /> 9031233 GET <2> <br />