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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(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 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 Texaco 62540276/980521-D1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Kent Brown Work Order# 9805E60 -01-16 Reported Jun 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# 05V8165 05VB165 05V8165 05V8165 <br /> Analy Method EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method NA NA NA NA <br /> Analyst L Hall L Hall L Hall L Hall <br /> LCS/LCSD # LCS052798 LCS052798 LCS052798 LCS052798 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 5/27/98 5/27/98 5/27/98 5/27/98 <br /> Analyzed Date 5/27/98 5/27/98 5/27/98 5/27/98 <br /> Instrument I D # - - - <br /> Conc Spiked 20ug/L 20pg/L 20Ng/L 20,ug/L <br /> Result 20 20 18 20 <br /> LCS% Recovery 100 100 90 100 <br /> Dup Result 20 20 18 20 <br /> LCSD % Recov 100 100 90 100 <br /> RPD 00 00 00 00 <br /> RPD Limit 0-30 0-30 0-30 0-30 <br /> 80-129 80-120 80-120 80-120 <br /> LCS 80-120 80-120 80-120 80-120 <br /> Control Limits <br /> Please Note <br /> SEQUOI LYTICAL The LCS is a control sample of known, Interferent4ree matrix that is analyzed using the same reagents, <br /> Ela 9 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 /> P ggy e r <br /> P lec anager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9805E60 BLA a 1> <br />