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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical t455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792 1865 FAX(707)792-0342 <br /> s <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-1848/ 980520-1-2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9805E65-03 Reported Jun 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS052498MTBEH6A <br /> Analy Method EPA 8250 <br /> Prep Method N A <br /> Analyst M Williams <br /> MS/MSD# 9805E4101 <br /> Sample Conc N D <br /> Prepared Date 5/24/98 <br /> Analyzed Date 5/24/98 <br /> Instrument I D# H6 <br /> Conc Spiked 50ug/L <br /> Result 46 <br /> MS % Recovery 92 <br /> Dup Result 45 <br /> MSD % Recov 90 <br /> RPD 22 <br /> RPD Limit 025 <br /> LCS# LCS052698 <br /> Prepared Date NA <br /> Analyzed Date 5/25/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 ug/L <br /> LCS Result 48 <br /> LCS % Recov 96 <br /> 60-140 <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 /> SEDUOI LYTICAL 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 /> gory <br /> ct Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9805E65 BLA <3> <br />