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1 f/ <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget 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)921 0100 <br /> Blaine Tech Services,Inc Client Project ID Chevron 9-1918 /960730-1-12 k <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose,CA 95133 <br /> Attention Jim Keller Work Order# 9608106 -01-02,04-09, 11-15 Reported Aug 15, 1996-, <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> GC Batch#: GCo80896BTEX07A G0080896BTEX07A G008089613TEX07A GCO80896STEX07A <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 Heider J Heider J Heider J Heider <br /> MS/MSD# 96071-10503 9607HOS03 9607HO503 9607HO503 <br /> Sample Conc • N D N D N D N D <br /> Prepared Date 8/8/96 8/8/96 8/8/96 8/8/96 <br /> Analyzed Date 8/8/96 8/8/96 8/8/96 8/8/96 <br /> Instrument I D#. GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked 10 Ng/L 10 pg/L io pg/L 30 ug/L <br /> Result 91 91 92 28 <br /> MS% Recovery: 91 91 92 93 <br /> Dup Result 90 90 91 27 <br /> MSD % Recov• 90 90 91 90 <br /> RPD, 11 11 11 36 <br /> RPD Limit. 0-25 025 0-25 0-25 <br /> LCS# BLKDSW96 BLK080896 BLK080896 BLK080896 <br /> Prepared Date 8/8/96 8/8/96 8/8/96 8/8/96 <br /> Analyzed Date 8/8/96 8/8/96 8/8/96 8/8/96 <br /> Instrument 1 D# GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc. Spiked 10ug/L 10pg/L 10frg/L 30pg/L <br /> LCS Result 86 86 87 26 <br /> LCS % Recov 86 86 87 87 <br /> 60-140 60-140 60-140 60140 <br /> LCS 70.130 70-130 70-130 70-130 <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 L 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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> L interference,the LCS recovery is to be used to validate the batch <br /> eggy Pen r <br /> Project Ma ager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9608106 BLA <1> <br />