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Sequoia <br /> 404 C Pe.Lk..Drive <br /> 680 Redwood CityCA 940630.650)364-9600 FAX(650)364-9233 <br /> et e Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 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 341 East Main St • <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 98071-186 -01 Reported Aug 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS073198MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method, NA <br /> Analyst L Zhu <br /> MS/MSD# 98071-17004 <br /> Sample Conc N D <br /> Prepared Date 7/31/98 <br /> Analyzed Date 7/31/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 jug/L <br /> Result 52 <br /> MS % Recovery 104 <br /> Dup Result 53 <br /> MSD % Recov 106 <br /> RPD 19 <br /> RPD Limit o-25 <br /> LCS# LC8073198 <br /> Prepared Date 7/31/98 <br /> Analyzed Date 7/31/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> LCS Result 51 <br /> LCS % Recov 102 - - - <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Nate <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> bA <br /> neALYTICAL 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 /> in rference,the LCS recovery is to be used to validate the batch <br /> P gwr <br /> 1 Prdject Manager * MS=Matrix Spike, MSD=IVIS Duplicate, RPD=Relative% Difference 98071-186 BLA <1> <br /> EI <br />