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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> %I0 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Tracy/970207-H3 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9702579-02-03, -05 Reported Mar 4, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GCO21497BTEX21A GCO21497BTEX21A GCO21497BTEX2iA GCO21497BTEX21A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Jirsa D Jirsa D Jirsa D Jirsa <br /> MS/MSD # 970230506 970230506 970230506 970230506 <br /> Sample Cone . N D N D N D N D <br /> Prepared Date' 2/14/97 2/14/97 2/14/97 2/14/97 <br /> Analyzed Date 2/14/97 2/14/97 2/14/97 2/14/97 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10ug/L 10ug/L 10ug/L 30ug/L <br /> Result 10 10 10 31 <br /> MS % Recovery 100 100 100 103 <br /> Dup Result 10 10 10 32 <br /> MSD % Recov 100 100 100 107 <br /> RPD 00 00 00 32 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK021497 BLK021497 BLK021497 BLK021497 <br /> Prepared Date 2/14/97 2/14/97 2/14/97 2/14/97 <br /> Analyzed Date 2/14/97 2/14/97 2/14/97 2/14/97 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10ug/L 10ug/L 10pg/L 30 ug/L <br /> LCS Result 92 92 93 29 <br /> LCS % Recov 92 92 93 97 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS Is a control sample of known,interferent4ree matrix that is analyzed using the same reagents, <br /> 7Per'o <br /> Q A ALYTICAL 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 /> 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 /> nn 1 <br /> t Manager *' MS=Matrix Spike,MSD=MS Duplicate, RFD=Relative%Difference 9702579 BLA <2> <br />