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i <br /> 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> trill>� 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 Chevron 9-8264/ 981124-J2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Christine Lillie Work Order# 9811 H50-01 Reported Dec 22, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Total Recoverable <br /> Petroleum Hydrocarbons <br /> QC Batch# SP12099855206 <br /> Analy Method SM 552OBF <br /> Prep Method SM 55208F <br /> Analyst L Gao <br /> BS/BSD # BLK120998 <br /> Sample Conc N D <br /> Prepared Date 12/9/98 <br /> Analyzed Date 12/10/98 <br /> Instrument I D # MANUAL <br /> Conc Spiked 10 mg/L <br /> Result 80 <br /> BS % Recovery 80 <br /> Dup Result 82 <br /> BSD % Recov 82 <br /> RPD 25 <br /> RPD Limit 0-30 <br /> LCS # <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I D # <br /> Conc Spiked <br /> LCS Result <br /> LCS % Recov <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 /> SEQUOIA A YTICAL 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 /> f 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 /> ro ct M n ger **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9811H50 BLA <7> <br />