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4 Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364-9233 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(51o)988 9673 Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)923 0100 Biaine Tech Services, Inc Client Project ID Chevron 9-1918, 950414-Z1 985 Timothy Drive Matrix Liquid San Jose, CA 95133 Attention Jim Keller Work Order# 9504A87 -01-08 Reported May 5, 1995 QUALITY CONTROL DATA REPORT Analyte Benzene Toluene Ethyl Xylenes Benzene QC Batch#- - _ Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Prep Method- - _ Analyst - - MS/MSD # DM042695BTEXGCA DM042695BTEXGCA DM042695BTEXGCA DMO426958TEXGCA Sample Conc N D N D N D N D Prepared Date N/A N/A N/A N/A Analyzed Date 4/26/95 4/26/95 4/26/95 4/26/95 Instrument I D # - Conc Spiked 10ug/L 10yg/L 10ug/L 30ug/L Result 11 11 11 33 MS % Recovery 110 110 110 110 Dup Result 11 12 11 34 MSD %Recov 110 120 110 113 APD 00 87 00 30 RPD Limit 050 0-50 050 050 LCS # - - - Prepared Date - - Analyzed Date, - Instrument I D #. - Conc Spiked. - LCS Result LCS %Recov • _ MS/MSID LCS 71133 72128 72-130 71-120 Control Limits Please Nate The LCS is a control sample of known,Interferent-free matrix that Is analyzed using the same reagents, TroALYTICAL 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 ggy nner ect Manager •*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9504A87 BL-A c 1> i