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Sequoia680 Chesapeake Drive Redwood Cim 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 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> x i n n 4 ` 1 S J ♦ ♦ r ry t x .tet <br /> Gettler Ryan/Geostrategies Client Project ED Unocal�SS#5886 v r N l A <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> n Attention Deanna Harding Work Order# 9803G82 -01, 05-08 Reported Apr 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC040398802009A GC040398802009A GC040398802009A GC040398802009A GCO40398802009A <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 8032500 <br /> Sample Conc N D N D N D N D 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 I D# HP9 HP9 HP9 HP9 HP9 <br /> Cone Spiked 20ug/L 20ug/L 20jtg/L 60ug/L 350pg/L <br /> Result 20 21 22 67 350 <br /> MS % Recovery 100 105 110 112 100 <br /> 0 Dup Result 20 21 21 64 340 <br /> SD % 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 # LCSO40398 LCSO40398 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 /> Cone Spiked 20Mg/L 20pg/L 20pg/L 60ug/L 350ug/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 same reagents, <br /> Elap #12 1 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 /> egory <br /> ect Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803G82 GET <1> <br />