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Sequoia680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget 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 /> Iwo- <br /> {.. Y <br /> 'Gettler Ryan/Ge'ostraiegies' Client Project IDV 'Unocal SS## 5886 <br /> "6747 Sierra Court, Ste J Matrix Liquid Z <br /> ;Dublin, CA 94568 <br /> 'Attention Deanna Harding Work Order# 98wU4-11, 12 Reported Apr 15, 1998.~ <br /> ♦ x i ix n r r + ,. + t r ,.. n r r ♦ r +ri~ + . yr a n v/ n v + r ry iC r.. t + <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC $atCh# GCO40398802009A GC-040398802009A GC040398802009A GC040398802009A GC040398802009A <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 D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 8032500 8032500 8032500 8032500 80325DO <br /> Sample Conc N D N D N D ND N D <br /> Prepared Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Analyzed Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Instrument 1.13 # HP9 HP9 HP9 HP9 HP9 <br /> Conc Spiked 20 Ng/L 20 frg/L 20 pg/L 60 ug/L 350 ug/L <br /> Result 20 21 22 67 350 <br /> MS % Recovery 100 105 110 112 100 <br /> Dup Result 20 21 21 64 340 <br /> 6SD %Recov 100 105 105 107 97 <br /> RPD 00 00 47 46 29 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LGSO40398 LGSO40398 LCSO40398 LCSO40398 LCSO40398 <br /> Prepared Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Analyzed Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Instrument I D # HP9 HP9 HP9 HP9 HP9 <br /> Conc Spiked 20Ng/L 20ug/L 20yg/L 60pg/L 350yg/L <br /> LCS Result 21 22 22 67 350 <br /> LCS %Recov 105 110 110 112 100 <br /> 60-140 60-140 60.140 60.140 60-140 <br /> LCS 70.130 70-130 70.130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the sante reagents, <br /> ElaRregory <br /> 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 H <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 /> Project Manager "*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803G82 GET <12> <br />