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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-93 <br /> (D 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(910)988-967673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Iwo Analytical 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 Thle Work Order# 98041109-22 Reported May 13, 1998 <br /> QUALITY-CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GCO50198802002A GCO50198802002A GCO50198802002A GCO50198802002A G0050198802002A <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 C Westwater C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD # 8041971 8041971 8041971 8041971 8041971 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 5/1/98 5/1/98 5/1/98 5/1/98 5/1/98 <br /> Analyzed Date 5/1/98 5/1/98 5/1/98 5/1/98 5/1/98 <br /> Instrument LD # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20yg/L 20ug/L 20yg/L 60ug/L 320ug/L <br /> Result 21 21 22 66 360 <br /> M$ % Recovery 105 105 110 110 113 <br /> Dup Result 21 21 22 64 390 <br /> MSD % Recov.• 105 105 110 107 122 <br /> RPD 00 00 00 31 80 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS050198 LCS050198 LCS050198 LCS050198 LC5050198 <br /> Prepared Date 5/1/98 5/11/98 5/1/98 5/11/98 5/1/98 <br /> Analyzed Date 5/1/98 5/1/98 5/1/98 5/1/98 5/1/98 <br /> Instrument I D.#- HP2 HP2 HP2 HP2 HP2 <br /> Conc. Spiked 20ug/L 20ug/L 20ug/L 60ug/L 320ug/L <br /> LCS Result 20 19 20 60 350 <br /> LCS % Recov 100 95 100 100 109 <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 /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> TPeg <br /> V271 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 I <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 /> Penner <br /> Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9804H07 BLA a6> <br />