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Sequoia 680 Chesapcakc Drove Redwood City, CA 9404.. (415) 364 9600 FAX(415) 364 9233 <br /> 15) <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 1I,) Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br />• L v <br /> 'Gettl6i'Ai an/G'eostrategles Client Project ID -x"Unocal+707 Paclflc+Ave Stockt <br /> +6747 Sierra Court, Ste J Matrix Liquid {g <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9608J10 -01 Reported Sep 17, 1996 <br /> y } O ,♦ v ti <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC090696BTEX17A GCO90696BTEX17A G0090696BTEX17A G0090696BTEX17A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst. R Vincent R Vincent R Vincent R Vincent <br /> MS/MSD # 9608E90-04 9608E90-04 9608E90-04 9608E90-04 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 9/6/96 9/6/96 9/6/96 9/6/96 <br /> Analyzed Date 9/6/96 9/6/96 9/6/96 9/6/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked. 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 10 10 10 30 <br /> MS % Recovery. 100 100 100 100 <br /> Dup Result 85 83 81 24 <br /> MSD % Recov .. 85 83 81 80 <br /> RPD 16 19 21 22 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> ' ` n . „ , } +r .. , , •, ,+ r, ,x,. Y , . r + v + 1 , n . < v w+ x kv.x <br /> LCS # GBLK090696 GBLK090696 GBLK090696 GBLK090696 <br /> Prepared Date 9/6/96 9/6/96 9/6/96 9/6/96 <br /> Analyzed Date 91'6/96 9/6/96 9/6/96 9/6/-96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc. Spiked' 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result. 10 98 97 29 <br /> LCS % Recov 100 98 97 97 <br /> MSIMSD 60-140 60-140 60-140 60-140 <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 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 /> Mik regory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9608J10 GET <1> <br />