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15) <br /> 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 /> 0AWAnalytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> BlalneTech 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 -01-02 Reported Jun 24, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO61697BTEX07A GC061697BTEX07A GCO61697BTEX07A GC061697BTEX07A GC061697BTEX07A <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 A Porter A Porter A Porter A Porter A Porter <br /> MS/MSD #• 970658501 970658501 970658501 970658501 970658501 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Analyzed Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Instrument I D #' GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked 10 pg/L 10 pg/L 10 pg/L 30 pg/L 60 ug/L <br /> Result 93 11 12 36 72 <br /> IS % Recovery 93 110 120 120 120 <br /> Dup Result 83 97 11 32 65 <br /> MSD % Recov 83 97 110 104 108 <br /> RPD G i3 87 12 10 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK061697 BLK061697 BLK061697 BLK061697 BLK061697 <br /> Prepared Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Analyzed Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked 10 pg/L 10 pg/L 10 pg/L 30 pg/L 60 pg/L <br /> LCS Result 89 10 11 34 69 <br /> LCS % Recov.. 89 100 110 113 115 <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 /> SBQUOIA�NALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> / i fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> tc 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 <br /> Project Manager "'*MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9706579 BLA [1;> <br />