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Sequoia 680 Chevipcakc Drivc Redwood Gty 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 /> Analytical 819 Striker Avenue,Sutte 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton 970610-Z1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9706579-03-05 Reported Jun 24, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO61497BTEX18A GCO61497BTEX18A GC061497BTEX18A GC061497BTEX18A GC061497BTEX18A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Helder J Helder J Heider J Heider J Helder <br /> MS/MSD # 970664609 970664609 970664609 970664609 970664609 <br /> Sample Conc ND N D N D N D N D <br /> Prepared Date 6/14/97 6/14/97 6/14/97 6/14/97 6/14/97 <br /> Analyzed Date 6/14/97 6/14/97 6/14/97 6/14/97 6/14/97 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> 0 Result 9 9 9 6 98 27 72 <br /> MS % Recovery 99 95 98 90 120 <br /> Dup Result 10 96 10 29 67 <br /> MSD % Recov 100 96 100 97 112 <br /> RPD 10 00 20 71 72 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK061497 BLK061497 BLK061497 BLK061497 BLK061497 <br /> Prepared Date 6/14/97 6/14/97 6/14/97 6/14/97 6/14/97 <br /> Analyzed Date 6/14/97 6/14/97 5/14/97 6/14/97 6/14/97 <br /> Instrument 10 #• GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> LCS Result a 3 99 10 30 66 <br /> LCS % Recov 93 99 100 100 110 <br /> 60-140 80-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 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 /> SEQ OIA NALYTICAL 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 /> y\J ` 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 /> Peggy Penner i.— <br /> Project Manager / **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9706579 BLA <2> <br />