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Sequoia 680 Chesapeake Drive Redwood Cary CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> fri <br /> a_� <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)92t-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> Blaine Tech Services, Inc Client Project ID Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 98071-188-10-12, 15 Reported Aug 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS080698MTBEH6A <br /> Analy Method. EPA 8260 <br /> Prep Method N A. <br /> Analyst M Williams <br /> MS/MSD# 9807DO901 <br /> Sample Cone N D <br /> Prepared Date 8/6/98 <br /> Analyzed Date 8/6/98 <br /> Instrument l D # H6 <br /> Cone Spiked 50lig/L <br /> Result. 59 <br /> MS % Recovery 118 <br /> 49 Dup Result 63 <br /> MSD % Recov 126 <br /> RPD. 66 <br /> RPD Limit 0-25 <br /> LCS # LCS080698 <br /> Prepared Date 8/6/98 <br /> Analyzed Date 8/6/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> LCS Result 52 <br /> LCS % Recov 104 <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 /> U AN 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 /> t covery 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 /> g enner <br /> P et Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 98071-187 BLA <5> <br />