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r <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 rAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 rAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921 0100V4QV ll <br /> (1 <br /> 0 <br /> Get ler Ryan%�eostrategies Client Project 1D Unocal 485515/6981 Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> ,Attention Greg Gurss Work Order# 9712281 -01 Reported Dec 15, 1997'-1, <br /> N r 1 ' , 4.y},~ ♦k{ ,v i .n44,nirSvnnn <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC1208976TEX2IA GC120897BTEX21A GC120897BTEX21A GC120897BTEX21A GC120897BTEXPIA <br /> Analy Method EPA 8020 EPA 8020 EPA8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A Miraftab A Miraftab A Miraftab A Miraftab A Miraftab <br /> M S/MSD # 9711 GO802 971160802 9711 GO802 9711 GO802 9711 GO802 <br /> Sample Conc N D N D N D N D ND <br /> Prepared Date 12/8/97 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Analyzed Date 12/8/97 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked 10frg/L 1opg/L 10ug/L 30pg/L 60yg/L <br /> Result 10 10 10 30 60 <br /> 4VS % Recovery 100 100 100 100 100 <br /> Dup Result 10 11 11 31 59 <br /> MSD % Recov 100 110 110 103 98 <br /> RPD 00 95 95 33 17 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK120897 BLK120897 BLK120897 BLK120897 BLK120897 <br /> Prepared Date 12/8/97 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Analyzed Date 12/8/97 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Instrument 1 D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked 10pg/L 10pg/L 10ug/L 30pg/L 60,ug/L <br /> f <br /> LCS Result 9 8 10 10 30 59 <br /> LCS % Recov 98 100 100 100 98 <br /> 60-140 60-140 60-140 60-140 60140 <br /> LCS 70-130 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 /> OEQUOIA AN LYTICAL 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 /> interference,the LCS recovery is to be used to validate the batch <br /> i regory <br /> Project Manager *"MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9712281 GET ¢I> <br />