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1 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9Z33 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite$ Sacramento CA 95834 (916)921-9600 FAX(9 16)92t-0100 <br /> � Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792 0342 <br /> Blaine Tech Services, Inc Client Project ID Shell 2575 Country Club <br /> 1680 Rogers Ave Matrix Liquid <br /> 'San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9804H09-19-21, 23-24 Reported May 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GC043098802002A GCO43098802002A GC043098802002A GC043098802002A GG043098802002A <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# 8041894 8041894 8041894 8041894 8041894 <br /> Sample Conc : N D ND N D N D N D <br /> Prepared Date 4/30/98 4/30/98 4/30/98 4/30/98 4/30/98 <br /> Analyzed Date 4/30/98 4/30/98 4/30/98 4/30/98 4/30/98 <br /> Instrument LD #: HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20pg/L 20ug/L 20ug/L 60ug/L 340 pg/L <br /> Result 18 17 18 54 370 <br /> MS % Recovery 90 85 90 so 109 <br /> Dup Result 16 15 16 48 380 <br /> MSD % Recov: 80 75 80 80 112 <br /> RPD 118 125 118 118 27 <br /> RPD Limit. 0-20 0-20 0-20 0-20 0-50 <br /> LCS# LC8043098 LCSO43098 LCSO43098 LCSO43098 LCSO43098 <br /> Prepared Date 4/30/98 4/30/98 4/30/98 4/30/98 4/30/98 <br /> Analyzed Date 4/30/98 4/30/98 4/30/98 4/30/98 4/30/98 <br /> Instrument LD #- HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20pg/L 20pg/L 20pg/L 60pg/L 340 pg/L <br /> LCS Result: 17 17 17 53 330 <br /> LCS % Recov. 85 85 85 88 97 <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 IAA A ICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> E # 7 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 g Penner <br /> P o ct Manager **MS=Matrix Spike, MSD=MS Duplicate, f1PD=Relative% Difference 9804H07 SLA <5> <br />