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:u Q <br /> 1 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek,CA 94598 (510)988-9600 FAX(5to)988-9673 <br /> a- ) <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92t-0100 <br /> 1455 McDowell Blvd Norrh Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> v r 2 v .r. v. n w s v A t F .. n •. ... � < h <br /> Gettler Ryan/Geostrategles H Client Project ID Tosco SS#6981,'i 80138 85 <br /> `6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 {' <br /> Attention Deanna Harding Work Order# 98051-147 01-13 Reported Jun 16, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE MTBE MTBE MTBE <br /> QC Batch# MSo6o198MTBEF2A MS060298MTBEF2A MS060298MTBEF2A MS060298MTBEF2B <br /> Analy Method EPA 8260 EPA 8260 EPA 8260 EPA 8260 <br /> Prep Method <br /> Analyst E Manuel E Manuel E Manuel L Zhu <br /> MS/MSD # 98051-16903 980601302 980601302 9805H4712 <br /> Sample Conc 14 115 115 N D <br /> Prepared Date. N A. N A. N A. N A- <br /> Analyzed Date 6/1/98 6/2/98 6/2/98 6/2/98 <br /> Instrument I D # F2 F2 F2 F2 <br /> Conic. Spiked So ug/L 50 ug/L 50 ug/L 50 pg/L <br /> Result 70 150 150 51 <br /> MS % Recovery 112 70 70 102 <br /> L <br /> Dup Result 72 150 150 50 <br /> D % Recov 116 70 70 100 <br /> RPD 28 00 00 20 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # LCS060198 LCS060298 LCS0602N LCS060398 <br /> Prepared Date N A N X NA 6/3/98 <br /> Analyzed Date" 6/1/98 6/2/98 6/2/98 6/3/98 <br /> Instrument I D # F2 F2 F2 F2 <br /> Conc Spiked 50ug/L 50ug/L 50ug/L 50Ng/L <br /> LCS Result. 60 47 51 51 <br /> LCS % Recov 120 94 102 102 <br /> SD 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 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 fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Tod Granlcher <br /> Project Manager ""MS=Matrix Spike,MSD=NIS Duplicate, RPD=Relative%Difference 9605H47 GET a2> <br />