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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(540)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> a- ) Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services, Inc Client Project ID � Shelf 2575 Country Clubs l01 <br /> 4.1880 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 98041-107-01-09, 9804H09-19-24 Reported May 13, 1998 <br /> OUALITY-CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS0502988260S2A <br /> Analy. Method EPA 8260 <br /> Prep Method EPA 5030 <br /> Analyst N Nelsen <br /> MS/MSD# 8041932 <br /> Sample Cone ND <br /> Prepared Date 5/2/98 <br /> Analyzed Date 5/2/98 <br /> Instrument I D # GCMS2 <br /> Cone Spiked 50Mg/L <br /> Result 49 <br /> MS %Recovery 98 <br /> Dup Result- 52 <br /> MSD% Recov.. 104 <br /> RPD 59 <br /> RPD Limit 0-25 <br /> LCS # LCS050298 <br /> Prepared Date. 5/2/98 <br /> Analyzed Date. 5/2/98 <br /> Instrument LD # GCMS2 <br /> Cone Spiked 50 jig/L <br /> LCS Result 49 <br /> LCS% Recov 98 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> JE # <br /> N YTICAL The LCS Is a control sample of known,Interferent-free matrix that 1s analyzed using the same reagents, <br /> 1 preparation,and analytical methods employed for the samples The matrix spike Is an aliquot of samplefortifl with known quantities of specific compounds and subjected to the entire analytical procedure He 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 /> ner <br /> nager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 98041-107 BLA <8a <br />