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Sequoia 680 Chesapeake Drive Rcdwood City,CA 94063 (415) 364 9600 TAX(415) 364 9233 <br /> (1�3 404 N Wiget Lane Walnut Crcck,CA 94598 (510) 988 9600 LAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suitc 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID ' Unocal#6981J, Project#4855 06 <br /> >3164 Gold Camp Drive #240 Matrix Liquid <br /> -Rancho Cordova, CA 95670 <br /> ,Attention Greg Gurss Work Order# 9701 F92 -01, 02 Reported Feb 13, 1997_ <br /> v r , v r n vn, ,,}r 4 , t , r r „ }v , 4 v v, ♦ � /~ ,hvv nvh <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GC013097BTEX17A GCO1309713TEX17A GC013097BTEX17A GC013097BTEX17A <br /> Analy, Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A Miraflab A Miraftab A Miraftab A Miraftab <br /> MS/MSD # 9701E6203 9701156203 9701E6203 9701E6203 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 1/30/97 1/30/97 1/30/97 1/30/97 <br /> Analyzed Date 1/30/97 1/30/97 1/30/97 1/30/97 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc. Spiked 10ug/L 10yg/L 10pg/L 30pg/L <br /> Result 95 94 93 28 <br /> NS % Recovery 95 94 93 93 <br /> Dug Result 91 91 91 28 <br /> MSD % Recov 91 91 91 93 <br /> RPD 43 32 22 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK013097 BLK013097 BLK013097 BLK013097 <br /> I <br /> Prepared Date 1/30/97 1/30/97 1/30/97 1/30/97 <br /> Analyzed Date 1/30/97 1/30/97 1/30/97 1/30/97 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked loug/L 10pg/L 10pg/L 30jrg/L <br /> LCS Result* 87 86 85 26 <br /> i <br /> LCS % Recov 87 86 85 87 <br /> M M D 50-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Mote <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 001.101A ANALYTICAL preparation,and analytloat 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 1s to be used to validate the batch <br /> Gregory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative % Difference 9701 F92 GET -4 1> <br />