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r' \ 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 /> IIF Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Enviros Client Project ID Shell 1267 Country Club, Stick <br /> 270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9704512 11 Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC041797BTEX07A GC041797BTIX07A GC041797BTEX07A GC041797BTEX07A GC041597BTEX07A <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/MSO# 970451904 970451904 970451904 970451904 970451904 <br /> Sample Conc . N D N D N D N D N D <br /> Prepared Date 4/17/97 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Analyzed Date- 4/17/97 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc. Spiked 10ug/L 10pg/L 10ug/L 30ug/L 60frg/L <br /> Result 10 99 98 29 64 <br />. MS % Recovery 100 99 98 97 107 <br /> Dup Result 11 10 10 31 68 <br /> MSD % Recov 110 100 100 103 113 <br /> RFD. 95 10 20 67 61 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK041797BSA BLK041797BSA LK041797BSA BLK0417973SA BLK041797BSA <br /> Prepared Date 4/17/97 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Analyzed Date. 4/17/97 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> LCS Result 10 10 99 30 64 <br /> LCS % Recov 100 100 99 100 107 <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 /> Wregory�� <br /> CAL 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 /> Protect Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9704512 EEE <19> <br />