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Sequoia 680 Chesapeake Drive Redwood CityCA94063 (650) 364-9600 FAX(650)364-9633 <br /> a- ) 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)911-9600 FAX(916)914-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> xBlaine Tech Services, Inc Client Project ID Shell 620 W Charter Way 0 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9805F39-11 Reported Jun 11, 1998 <br /> QUALITY_CONTROL DATA_REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC060498802005A GCO60498802005A GCO60498802005A GCO60498802005A GCO60498802005A <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 K NIII K Ndf K Nil] K Ni]i K Nill <br /> MS/MSD # 8052272 8052272 8052272 8052272 8052272 <br /> Sample Conc. N D N D 0 55 2 8 N D <br /> Prepared Date 6/4/98 6/4/98 6/4/98 6/4/98 6/4/98 <br /> Analyzed Date 6/4/98 6/4/98 6/4/98 6/4/98 6/4/98 <br /> Instrument I D.# HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20 jig/L 20 Ng/L 20 ug/L 60 pg/L 290 jug/L <br /> Result 19 19 19 60 350 <br /> MS % Recovery 95 95 92 95 121 <br /> Dup Result 19 19 19 61 330 <br /> MSD % Recov - 95 95 92 102 114 <br /> RPD 00 00 00 17 59 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS060498 LCS060498 LCS060498 LCS060498 LCS060498 <br /> Prepared Date. 6/4/98 6/4/98 6/4/98 6/4/98 6/4/98 <br /> Analyzed Date- 6/4/98 6/4/98 6/4/98 6/4/98 6/4/98 <br /> Instrument I.D.# HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20pg/L 20ug/L 20pg/L 60Mg/L 290lrg/L <br /> LCS Result 19 19 19 59 310 <br /> LCS % Recov 95 95 95 98 107 <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 /> SEQ I NALYTICAL The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, <br /> # 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 /> P gg Penner <br /> P of et Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative q Difference 9805F39 BLA <2> <br />