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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (690)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <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)792-1665 FAX(707)792-0342 <br /> ry <br /> Blaine Tech Services, Inc Client Project ID Shell, 341 East Main St , Ripon <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose,-CA 95112 - <br /> Attention Fran Thie Work Order# 9902A43-01 Reported Mar 5, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />_ QC Batch# _MS0226998260S2A <br /> Analy Method EPA 8260 <br /> Prep Method EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD# 9021709 <br /> Sample Conc 86 <br /> Prepared Date 2/26/99 <br /> Analyzed Date 2/26/99 <br /> Instrument I D # GCMS2 <br /> Conc Spiked 50ug/L <br /> Result 70 <br /> MS % Recovery 122 <br /> Dup Result 68 • <br /> MSD %Recov 119 <br /> RPD 29 <br /> RPD Limit 0-25 <br /> i <br /> LCS # LCS030299 <br /> Prepared Date 3/2/99 <br /> Analyzed Date 3/2/99 <br /> Instrument I D # GCMS2 <br /> Conc. Spiked. 50 ug/L <br /> LCS Result- 38 <br /> LCS %Recov 76 <br /> 60-140 <br /> _LCS_ __- -70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> Elap#1271 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 /> repo <br /> Project M eager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9902A43 BLA <3> <br />