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680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-4275 /971125-SI <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9711 G19-01, 04, 07-09, 9711 G20-01 Reported Dec 15, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS120597MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst M Williams <br /> MS/MSD # 9711 F4104 <br /> Sample Conc 24 <br /> Prepared Date 12/5/97 <br /> Analyzed Date 12/5/97 <br /> Instrument I D # F3 <br /> Conc Spiked 50pg/L <br /> Result 73 <br /> • MS %Recovery 98 <br /> Dup Result 73 <br /> MSD % Recov 98 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS # BLK120597 <br /> Prepared Date 12/5/97 <br /> Analyzed Date 12/5/97 <br /> Instrument I D # F3 <br /> Conc Spiked 50,ug/L <br /> LCS Result 49 <br /> LCS % Recov 78 <br /> 50-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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 fail within specified control limits due to matrix <br /> GL y� nterference,the LCS recovery is to be used to validate the batch <br /> Peggy Penner <br /> Project Manager *"MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9711G19 BLA �4> <br />