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Sequoia Walnut N et Lane t Creek,.CACA 94598 (925)98&9600 �ll� Analytical FAX(925)988 4673 4kettler-Ryin-Dublin Client Project ID Unocal #5886, Stockton 6747 Sierra Court, Suite J Matrix Liquid "Dublin, CA 94568 Attention Deanna Harding QC Sample Group 908373 Reported Sep 14, 1999 QUALITY CONTROL DATA REPORT Analyte Benzene Toluene Ethyl Xylenes Benzene QC Batch#. GCO82799 GCO82799 GC082799 GCO82799 802005A 802005A 802005A 802005A Analy Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 Prep. Method' EPA 5030 EPA 5030 EPA 5030 EPA 5030 Analyst C Westwater C Westwater C Westwater C Westwater MS/MSD#- 90837112 90837112 90837112 90837112 Sample Cone N D N D N D N D Prepared Date 8/27/99 8/27/99 8/27/99 8/27/99 Analyzed Date. 8/27/99 8/27/99 8/27/99 8/27/99 Instrument I D #' HP-5 HP 5 HP-5 HP-5 Cone. Spiked. 20ug/L 20pg/L 20Y9/L 60ug/L Result 20 20 20 63 MS %Recovery 100 100 100 105 Dup Result 21 21 21 65 MSD % Recov 105 105 105 108 RPD 49 49 49 31 RPD Limit 0-20 0-20 0-20 0-20 LCS #' 5LCS082799 5LCS082799 5LCS082799 5LCS082799 Prepared Date- 8/27/99 8/27/99 8/27/99 8/27/99 Analyzed Date 8/27/99 8/27/99 8/27/99 8/27/99 Instrument I D # HP 5 HP 5 HP 5 HP-5 Cone Spiked 20ug/L 20ug/L 20 jig/L 60ug/L LCS Result 23 23 22 70 LCS % Recov : 115 115 110 117 LCS 70.130 70-130 70-130 70-130 Control Limits Please Note The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample fortified with known quantities of specific compounds and subjected to the entire analytical procedure If the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix interference the LCS recovery is to be used to validate the batch OJ Fegley '*MS=Matnx pike,M D=MS DUPt=e,RPD=Relative%Difference Project Manager W908373 GET <6>