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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 1W Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (915)921-9600 FAX(916)921 OIOQ <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine'li ech Services, Inc Client Project ID Shell 620 W Charter Way <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9808909 11 Reported Sep 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC Batch#- GCO83198802002A GC083198802002A GC083198802002A GC083198802002A GC083198802002A <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# 8081931 8081931 8081931 8081931 8081931 <br /> Sample Conc. N D N D N D N D N D <br /> Prepared Date 8/31/98 8/31/98 8/31/98 8/31/98 8/31/98 <br /> Analyzed Date 8/31/98 8/31/98 8/31/98 8/31/98 8/31/98 <br /> Instrument I.D # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20 pg/L 20 jig/L 20 ug/L 60 pg/L 340 ug/L <br /> Result: 20 20 20 60 330 <br /> MS % Recovery- 100 100 100 100 97 <br /> Dup. Result- 19 19 19 57 320 <br /> MSD % Recov 95 95 95 95 94 <br /> RPD 51 51 51 51 31 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> r <br /> LCS # LCS083198 LCS083198 LCS083198 LCS083198 LCS083198 <br /> Prepared Date- 8/31/98 8/31/98 8/31/98 8/31/98 8/31/98 <br /> Analyzed Date- 8/31/98 8/31/98 8/31/98 8/31/98 8/31/98 <br /> Instrument I D #- HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20ug/L 20pg/L 20pg/L 60pg/L 340 ug/L <br /> LCS Result 21 21 22 64 340 <br /> LCS % Recov 105 105 110 107 100 <br /> LCS 70-130 70-130 70-130 70-130 60-140 <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 /> SffUA A ALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br />�� 71 fortified with know _quantities of specific compounds and subjected to the entire analytical procedure Iferecovery of analytes from the matrix spike does not fall within specified control limas due to matrix <br /> interference,the LCS recovery is to be used to validate the batchPnerPnager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9808909 BLA <3> <br />