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r Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wigct 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 /> ;Gettler Ryan/Geostrategie's Clie'n't Project IDr r Wocalv4855 18/6981 Stockton <br /> r <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Greg Gurss Work Order# 9712281-02 Reported Dec 15, 19971-{ <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC120897BTEX02A GC120897BTEX02A GC120897BTEX02A GC1208976TEX02A GC120897BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA5030 EPA 5030 EPA 5030 <br /> Analyst A Miraftab A Miraftab A Miraftab A Miraftab A.Miraftab <br /> M S/MSD # 9711 G0802 9711 G0802 9711 G0802 9711 GO802 9711 G0802 <br /> Sample Conc N D N D N D N 0 N D <br /> Prepared Date 12/13/97 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 12/13/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10/ig/L 10 Ng/L 10 ug/L 30 yg/L 60 Ng/L <br /> Result 93 92 91 28 67 <br /> 14V % Recovery 93 92 91 93 112 <br /> Dup Result 98 '96 9 7 29 70 <br /> MSD % Recov 98 96 97 97 117 <br /> RPD 52 43 64 35 44 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> { <br /> ., rr v z v v r + y r v ti t vv rr r r • rvrn v r r r k �r.nr r{ <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 I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Sptked 101tg/L 10frg/L 10pg/L 30Ng/L 60Ng/L <br /> LCS Result 9 1 a 8 88 27 66 <br /> LCS % Recov 91 88 88 90 110 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70130 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 /> �EQUOIA 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 /> 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 /> lk regory <br /> Project Manager MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9712281 GET <2> <br />