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1 Sequoia 680 Chesapeake Dnvc 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 /> Analytical 819 Striker Avenue,Suite a Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton/970610-Z4' <br /> 1660 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9706578-04 Reported Jun 24, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#. G0061397BTEX18A GCO61397BTEX18A GC061397BTEX18A GCO61397BTEX18A GC0613978TEX18A <br /> Analy Method, EPA 8020 EPA 8020 EPA 6020 EPA 8020 EPA 8015M <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst R Geckler R Geckler R Geckler R Geckler R Geckler <br /> MS/MSD#- 970646907 970646907 970646907 970646907 970646907 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date- 6/13/97 6/13/97 6/13/97 6/13/97 6/13/97 <br /> Analyzed Date 6/13/97 6/13/97 6/13/97 6/13/97 6/13/97 <br /> Instrument I D.# GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Cone. Spiked 10pg/L 10pg/L 10ug/L 30pg/L 60pg/L <br /> Result 91 95 9 6 28 58 <br /> 41 % Recovery 91 95 96 93 97 <br /> Dup Result 97 10 10 30 67 <br /> MSD %Recov 97 102 102 100 112 <br /> RPD 64 51 41 69 14 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS .# BLK061397 BLK061397 BLK061397 BLK061397 BLK061397 <br /> Prepared Date. 6/13/97 6/13/97 6/13/97 6/13/97 6/13/97 <br /> Analyzed Date, 6/13/97 6/13/97 6/13/97 6/13/97 6/13/97 <br /> Instrument I.D.# GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Cone. Spiked 10pg/L 10pg/L 10pg/L 30ug/L 60pg/L <br /> LCS Result 9 5 98 9 9 29 65 <br /> LCS %Recov 95 98 99 97 108 <br /> 60-140 60-140 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 /> SB YIAIN0— <br /> preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> �44 <br /> _ fortified with known quantities of specific compounds and subjected to the entire analytical procedure It <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> 0— interference,the LCS recovery is to be used to validate the batch <br /> Peggy Penner <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPDmRelahve Difference 9706578 BLA <2> <br />