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ai 4 4 1) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415)364-9233 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 Analytical 819 Sinker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 Blaine 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 OC Batch#, - - - Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Prep Method - - - Analyst MS/MSD # DMO42795BTEXGCA DM042795BTEXGCA DM042795BTEXGCA DMG42795BTEXGCA Sample Cone N D ND N D N D Prepared Date N/A N/A N/A N/A Analyzed Date 4/27/95 4/27/95 4/27/95 4/27/95 Instrument I D # - - Cone Spiked 10pg/L 10ug/L 10ug/L 30ug/L Result 11 12 11 33 •MS %Recovery 110 120 110 110 Dup Result 10 11 11 32 MSD% Recov 100 110 110 107 RPD 95 87 00 31 RPD Limit 050 050 050 0-50 LCS# - - - Prepared Date - - . Analyzed Date. - Instrument 1 D # - Cone. Spiked. - LCS Result* - LCS% Recov .. - MS/MSD LCS 71-133 72128 72-130 71120 Control Limits Please Note The LCS is a control sample of known,interferent4ree matrix that is analyzed using the same reagents, IA 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 leg enner Project Manager "*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9504A87 BLA <2>