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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> • " 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> 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/970827-T2 <br /> 1680 Rogers Ave Matrix Liquid <br /> a San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9708F55 -01 Reported Sep 17, 1997 , <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> CSC Batch#: GCO90397BTEX18A GC090397BTEXISA GCO90397BTEX18A GCO90397BTEX18A GCO90397BTEX18A <br /> Ana ly Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A.Porter A.Porter A. Porter A.Porter A Porter <br /> MS/MSD# 9708D7804 9708D7804 9708D7804 9708D7804 970BD7804 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 9/3/97 9/3/97 9/3/97 9/3/97 9/3/97 <br /> Analyzed Date 9/3/97 9/3/97 9/3/97 9/3/97 9/3/97 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked 10 Ng/L 10 pg/L 10 dig/L 30 pg/L 60 pg/L <br /> Result 99 99 99 30 60 <br /> MS % Recovery 99 99 99 100 100 <br /> Dup Result 10 10 99 31 61 <br /> MSD % Recov 100 100 99 103 102 <br /> RPD 10 10 00 33 17 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS#. BLK090397 BLK090397 BLK090397 BLK090397 BLK090397 <br /> Prepared Date: 9/3/97 9/3/97 9/3/97 9/3/97 9/3/97 <br /> Analyzed Date: 9/3/97 9/3/97 9/3/97 9/3/97 9/3/97 <br /> Instrument I.D.#: GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked: 10ug/L 10pg/L 10Ng/L 30Etg/L 60ug/L <br /> LCS Result: 99 99 99 31 60 <br /> LCS % Recov: 99 99 99 103 100 <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 /> 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 /> eg Penner <br /> P lett Manager "*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9708F55 BLA <1> <br />