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® Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N wiget Lane <br /> 1455 MWalnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)92t-9600 FAX(916)921-0100 <br /> u McDowell Blvd North,Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services, Inc Client Project ID Shell 1071 N Main St <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9804175-04 Reported May 18, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC050798802005A GCO50798802005A GC050798802005A GC050798802005A GCO50798802005A <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 Nill K Nill K Nill K Nill K Nill <br /> MS/MSD# 8050076 8050076 8050076 8050076 8050076 <br /> Sample Conc N D N D N D N D ND <br /> Prepared Date 5/7/98 5/7/98 5/7/98 5/7/98 5/7/98 <br /> Analyzed Date 5/7/98 5/7/98 5/7/98 5/7/98 5/7/98 <br /> Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20pg/L 20pg/L 20pg/L 60pg/L 410 ug/L <br /> Result 20 20 20 63 370 <br /> MS % Recovery 100 100 100 105 90 <br /> Dup Result 19 20 19 61 404 <br /> MSD % Recov - 95 100 95 102 99 <br /> RPD 51 00 51 32 88 <br /> RPD Limit 0-20 0-20 0-20 0-20 050 <br /> LCS# LC8050798 LCS050798 LCS050798 LCS050798 LCS050798 <br /> Prepared Date 5/7/98 5/7/98 5/7/98 5/7/98 5/7/98 <br /> Analyzed Date 5/7/98 5/7/98 5/7/98 5/7/98 5/7/98 <br /> Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20 Mg/L 20 dig/L 20 pg/L 60 Ng/L 410 pg/L <br /> LCS Result 18 18 18 57 380 <br /> LCS % Recov 90 90 90 95 93 <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 A ALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> 71 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 /> Pegg Penner <br /> Proj et Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9804175 BLA <3> <br />