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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9133 <br /> 4D404 N W.vt Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)92.1 0100 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-1918/951031-M2 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 9511065-06 Reported Nov 13, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GC1102956TEX20A GC110295STEX20A GC110295BTEX20A (3C110295BTEX20A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J Woo J Woo J Woo <br /> MS/MSD # 9511G1111 9511G1111 9511G1111 9511G1111 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 11/2/95 11/2/95 11/2/95 11/2/95 <br /> Analyzed Date 11/2/95 11/2/95 11/2/95 11/2/95 <br /> Instrument I D #. GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> Result 11 11 11 32 <br /> . MS %Recovery 110 110 110 107 <br /> Dup Result 11 11 11 33 <br /> MSD % Recov 110 110 110 110 <br /> RAD 00 00 00 31 <br /> RPD Limit 0-50 0-50 0.50 0-50 <br /> LCS # BLK102795 BLK102795 BLK102795 BLK102795 <br /> Prepared Date 11/2/95 11/2/95 11/2/95 11/2/95 <br /> Analyzed Date 11/2/95 11/2/95 11/2/95 11/2/95 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc. Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> LCS Result 10 10 10 31 <br /> LCS% Recov 100 100 100 103 <br /> MS/MSD <br /> LCS 71-133 72-128 72-130 71-120 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> llln��l the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> 1 interference,the LCS recovery 1s to be used to validate the batch <br /> Peggy Penger <br /> r <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9511065 BLA <3> <br />