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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(510)988-9673 <br /> Analytical 100 <br /> 819 Striker Avenue Suite$ Sacramento CA 95834 (707)921-9600 865 FAX(707)792-0342( ) <br /> 1455 McDowell Blvd North Ste P Petaluma,CA 94954 ( ) <br /> 10Slaine Tech Services, Inc Client Protect ID Shell 2575 Country Club <br /> 1680 Rogers Ave Matrix Liquid <br /> San,lose, CA 95112 <br /> Attention Fran Th1e Work Order# 9804H08-10-18 Reported May 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> OC Batch#: MS050698826aS2A <br /> Analy Method EPA 8260 <br /> Prep Method EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD # 8041965 <br /> Sample Cone • N D <br /> Prepared Date- 5/6/98 <br /> Analyzed Date 5/6/98 <br /> Instrument I D # GCMS2 <br /> Cone Spiked SOpg/L <br /> Result 52 <br /> MS % Recovery 104 <br /> Dup Result 51 <br /> IVSD % Recov : 102 <br /> RPD 19 <br /> RPD Limit, 0-25 <br /> LCS # LCS050698 <br /> Prepared Date. 5/6/98 <br /> Analyzed Date: 5/6/98 <br /> instrument LD # GCMS2 <br /> Cone Spiked. 50,ug/L <br /> LCS Result 53 <br /> LCS % Recov : 106 <br /> x0-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> SEWOi N LYTICAL The LCS Is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> preparation,and analytical methods employed for the samples The matrix spike 1s 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 g Penner <br /> Pr et Manager "`"`MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 98041-107 BLA <7> <br /> g� <br />