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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 364 9600 FAX (415) 364 9233 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 i Blame Tech Services, Inc Client Project ID Chevron 9-4183/960222-L1 985 Timothy Drive Matrix Liquid San Jose, CA 95133 Attention Jim Keller Work Order # 9602D89-03 Reported Feb 27, 1996 QUALITY CONTROL DATA REPORT Analyte 1,2,4 Trichloro 4-Chlofo-3 Acenaphthene 4-Nitrophenol benzene Methylphenol CC Batch# MS0222968270EXA MS0229968270EXA MS0222968270EXA MS0222968270EXA Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 Prep Method EPA 3510 EPA 3510 EPA 3510 EPA 3510 Analyst B Pitamah B Pitamah B Pitamah B Pitamah MS/MSD# BLK022296 BLK02MB BLK022296 BLK022296 Sample Conc N D N D ND N D Prepared Date 2/22/96 2/22/96 2/22/96 2/22/96 Analyzed Date 2/22/96 2/22/96 2/22/96 2/22/96 Instrument I D # F4 F4 F4 F4 Conc Spiked 200yg/L 200Ng/L 200Ng/L 200ug/L Result 160 200 130 60 MS % Recovery 80 100 65 30 Dup Result 160 200 130 69 MSD % Recov 80 100 65 35 RPD 00 00 00 14 RPD Limit 050 0-50 050 0-50 LCS # - - - Prepared Date - - Analyzed Date: - - - Instrument I D # - - - Conc Spiked - - - LCS Result. - - - LCS %Recov • - - MS/MSD LCS 40-120 30-120 50-144 20-120 Control Limits Please Note The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, 7Prject A A ALYTICAL 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 er **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference Manager Page 2 of 3 9602D89 BLA <5>