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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 /> ,!D— <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-4275/980326-G7 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9803157-02-09 Reported Apr 21, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MSO40198MTBEH6A <br /> Anally. Method EPA 8260 <br /> Prep Method NA <br /> Analyst L Zhu <br /> MS/MSD# 9803KO201 <br /> Sample Conc 41 <br /> Prepared Date - <br /> Analyzed Date. 4/1/98 <br /> Instrument LD # H6 <br /> Conc Spiked. 50 jug/L <br /> Result. 58 <br /> MS % Recovery. 108 <br /> Dup Result 60 <br /> MSD % Recov 112 <br /> RPD 34 <br /> RPD Limit 0-25 <br /> LCS# LCSO40198 <br /> Prepared Date - <br /> Analyzed Date 4/1/98 <br /> Instrument l D # HIS <br /> Conc. Spiked 50 pg/1- <br /> LCS <br /> g/LLCS Result- 54 <br /> LCS % Recov .. 108 <br /> fi0-140 <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 /> E IA A ALYTICAL 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 gg nner <br /> P o ct Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9803157 SLA <2> <br />