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1 <br /> �M) i <br /> �� ut <br /> Sequoia 680 Chesapeake Dnve 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 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> 'Gatti <br /> er Ryan%Geosirategies Client Project ID Unocal 0123/1034 Genual Ave' <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94588 <br /> Attention Deanna Harding Work Order# 9803H06 -01-05 Reported Apr 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC040298802005A GCO40298802005A GC040298802005A GC040298802005A GCO40298802005A <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 #• 8032440 8032440 8032440 8032440 8032440 <br /> Sample Cone. N D N D NO N D N D <br /> Prepared Date 4/2/98 4/2/98 4/2/98 4/2/98 4/2/98 <br /> Analyzed Date 4/2/98 4/2/98 4/2/98 4/2/98 4/2/98 <br /> Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked- 20Ng/L 20ug/L 20ug/L 60ug/L 320 ug/L <br /> Result 22 23 23 71 280 <br /> MS % Recovery 110 115 115 118 88 <br /> Dup Result 25 21 21 66 320 <br /> MSD % Recov 125 195 105 110 100 <br /> RPD 13 91 91 73 13 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCSO40298 LCSO40298 LCSO40298 LCSO40298 LCSO40298 <br /> Prepared Date 4/2/98 4/2/98 4/2/98 4/2/98 4/2/98 <br /> Analyzed Date. 4/2/98 4/2/98 4/2/98 4/2/98 4/2/98 <br /> Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked. 20 ug/L 20 pg/1- 20 ug/L 60 ug/L 320 ug/L <br /> LCS Result 21 22 22 68 330 <br /> LCS % Recov : 105 110 110 113 103 <br /> 60-140 60-140 50-140 / 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#1271 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 /> rego y <br /> oject Manager `*MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9803H06 GET <1> <br />