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Sequoia 680 Chesapeake Dave Redwood City CA 94063 (415) 364%00 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 Blaine Tech Services, Inc Client Project ID Chevron 9-5075, 950414-Z2 985 Timothy Drive Matrix Liquid San Jose, CA 95133 Attention Jim Keller Work Order# 9504A63 -01-06 Reported May 1, 1995 QUALITY CONTROL DATA REPORT Analyte Benzene Toluene Ethyl Xylenes Benzene - OC Batch#- GCO42395BTEX02A GCO42395BTEX02A GCO42395BTEX02A GCO42395BTEX02A Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 Analyst J Minkel J Minkel J Minkel J Minkel M S/MSD# 950493103 950493103 950493103 950493103 Sample Conc ND N D ND N D Prepared Date 4/23/95 4/23/95 4/23/95 4/23/95 Analyzed Date 4/23/95 4/23/95 4/23/95 4/23/95 Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 Conc Spiked 10Ng/L 10yg/L 10Ng/L 30 u9/L Result 11 11 11 35 MS % Recovery 110 110 110 117 Dup Result 10 10 10 31 MSD °,% Recov 100 100 100 103 RPD. 95 95 95 12 RPD Limit 0-50 0-50 0-50 0-50 LCS # - - - Prepared Date - - - Analyzed Date - - Instrument I D # - - Conc Spiked - - LCS Result - - - LCS % Recov - - - - MS/MSD LCS 71-133 72-128 72-130 71-120 Control Limits Please Note The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, 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 Z ne Chin Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9504A63 BLA