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Sequoia <br /> ce Ll�l a 0680 Chesapeake Drive Redwood City CA 9400 (650) 364 9600 FAX(650)364 9133 <br /> 1 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Sutte 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Ground Zero Analysis, Inc Client Project 1D 96-163 / Knowles Rock <br /> 1714 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention Greg Stahl Work Order# 9711038 -01-02 Reported Nov 7, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyi Xylenes Gas <br /> Ben2ene <br /> QC Batch# GC1105978TEX21A GC1105973TEX21A GC110597BTEX21A GC110597BTEX21A GC110597BTEX21A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 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 /> MS/MSD # 971101701 971101701 9711C1701 971101701 971101701 <br /> Sample Conc N D N D N 7 N D N D <br /> Prepared Date 11/5/97 11/5/97 11/5/97 11/5/97 11/5/97 <br /> Analyzed Date 11/5/97 11/5/97 11,'E/97 11/5/97 11/5/97 <br /> Instrument i D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10ug/L 10ug/L 10jig/L 30pg/L 60Ng/L <br /> Result 91 89 8 7 26 64 <br /> MS % Recovery 91 89 8' 87 107 <br /> Dup Result 93 90 8D 27 52 <br /> MSD %Recov 93 90 B9 90 87 <br /> RPD 22 11 23 38 21 <br /> RPD Limit 025 025 025 025 0-25 <br /> LCS # BLK110597 BLK110597 BLK110597 BLK110597 BLK110597 <br /> Prepared Date 11/5/97 11/5/97 11/5/97 11/5/97 11/5/97 <br /> Analyzed Date 11/5/97 11/5/97 11/5/97 11/5/97 11/5/97 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10yg/L 10pg/L 10ug/L 30yg/L 60pg/L <br /> LCS Result 88 89 6 7 26 52 <br /> LCS % Recov 88 89 8' 87 87 <br /> 60140 60140 60140 60-140 60140 <br /> LCS 70130 70130 70130 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 /> 0 SEQ A ALYTICAL 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 ti1a matrix spike does not fall within spec:fled control limits due to matrix <br /> snterference,the LCS recovery is to be used to validate the batch <br /> P gy ner <br /> Pro onager **MS=Matrix Spike,MSD=MS Duplicate RPD=Relative% Difference 9711038 GGG <1> <br /> n, <br />