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Sequoia esapeake Drive Redwood City CA 9 (650) 364-9600 FAX(650)364-9233 <br /> Wiget Lane Walnut Creek CA 94P <br /> (510)988-9600 FAX(510)988-9673 <br /> 8i raker Avenue Suite 8 Sacramento CA 958 (916)921-9600 FAX(916)921-0E00 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)79z-0342 <br /> "Blame Tech Services, Inc Client Project ID Shell 3725 S Tracy Blvd <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9805F08-01-05 Reported Jun 11, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GCO60298802005A GC060298802005A GC060298802005A GC060298802005A GCO60298802005A <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 NiH K Nill K Ndl K Nill K Nill <br /> MS/MSD# 8060003 8060003 8060003 8060003 8060003 <br /> Sample Conc . N D N D N D N D N D <br /> Prepared Date 6/2/98 6/2/98 6/2/98 6/2/98 6/2/98 <br /> Analyzed Date 6/2/98 6/2/98 6/2/98 6/2/98 6/2/98 <br /> Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20yg/L 20pg/L 20Ng/L 60ug/L 400 pg/L <br /> Result: 18 18 18 57 360 <br /> MS % Recovery. 90 90 90 95 90 <br /> 0 Dup. Result 19 20 19 58 450 <br /> MSD % Recov 95 100 95 97 113 <br /> RPD 54 105 54 17 222 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS060298 LCS060298 LCS060298 LCS060298 LCS060298 <br /> Prepared Date 6/2/98 6/2/98 6/2/98 6/2/98 6/2/98 <br /> Analyzed Date 6/2/98 6/2/98 6/2/98 6/2/98 6/2/98 <br /> Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked. 20mg/L 20pg/L 20 jug/L 60Ng/L 400,ug/L <br /> LCS Result 17 16 17 49 280 <br /> LCS % Recov 85 80 85 82 70 <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 /> SEQUO A ALYTICAL The LCS is a control sample of known, Interferent-free matrix that is analyzed using the same reagents, <br /> 271 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 /> eg Penner interference,the LCS recovery is to be used to validate the batch <br /> P ct Manager *"MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9805F08 BLA <2> <br />