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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) 966 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(9t6) 921 oto0 <br /> s <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton /970131-Z1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9702115 08, 10, 13 Reported Feb 13, 1997 <br /> [,QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> GC Batch# GCO21097STEX02-A GCO21097BTEX02A GCO21097BTEX02A GCO21097BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A.Miraftab A Miraftab A.Miraftab A Miraftab <br /> MS/MSD# 97011-14202 97011-14202 97011-14202 97011-14202 <br /> Sample Conc ' N D N D N D N D <br /> Prepared Date 2/10/97 2/10/97 2/10/97 2/10/97 <br /> Analyzed Date 2/10/97 2/10/97 2/10/97 2/10/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10,ug/L 10ug/L 10pg/L 30Ng/L <br /> Result 94 95 97 31 <br /> MS % Recovery 94 95 97 103 <br /> 10 Dup. Result 90 91 94 29 <br /> MSD % Recov 90 91 94 97 <br /> RPD 43 43 31 67 <br /> RPD Limit 0-25 0-25 0-25 0.25 <br /> LCS # BLK021097A BLK021097A BLK021097A BLK021097A <br /> Prepared Date 2/10/97 2/10/97 2/10/97 2/10/97 <br /> Analyzed Date 2/10/97 2/10/97 2/10/97 2/10/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10pg/L 10,ug/L 10pg/L 30 ug/L <br /> LCS Result 94 95 98 31 <br /> LCS % Recov 94 95 98 103 <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,interferent-free matrix that is analyzed using the same reagents, <br /> S I ANALYTICAL 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 /> g e <br /> P Jct Manager *"'MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9702115 BLA <4> <br />