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IF 4D— Sequoia 404 N Wige4r'Lane Walnut Creek,CA 94598 _ Analytical - -- -- _ _ _ __-_ _ _ - _ _ = 9251 988-9600 FAX(925)98&9673 Getder-Ryan- Dublin Client Project ID Unocal #5886, Stockton 6747 Sierra Court, Suite J Matrix Liquid elDublin, CA 94568 Attention Deanna Harding OC Sample Group 908373 Reported Sep 14, 1999 QUALITY CONTROL DATA REPORT Analyte. Benzene Toluene - Ethyl Xylenes- _ Benzene OC Batch# GCO82799 GCD82799 GCO82799 GC082799 802002A=_'—f==802002A--_ -=802002Ar 8—-- —_- -- 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 #' 90832103 90832103 90832103 90832103 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-2 HP-2 HP-2 HP-2 Cone Spiked 20,ug/L 20ug/L 20ug/L 60ug/L Result. MS% Recovery Dup Result MSD % Recov RPD RPD Limit LCS # 2LCS082799 2LCS082799 2LCS082799 2LCS082799 Prepared Date 8127/99 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 2 HP-2 HP-2 HP 2 Cone Spiked 20ug/L 20u9/L 20pg/L 60ug/L LCS Result 20 18 21 63 LCS %Recov 100 90 105 105 LCSD Result 20 18 18 61 LCSD %Recov 100 90 90 102 LCS 70130 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 yy the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix interference the LCS recoveryis to be used to validate the batch . ?Ullaln. Fegley M =Matrix pike, MSD=MS Duplicate,RPD=Relative% Difference Prfllect Manager W908373 GET <5>