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1 680 Chesapcake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 1 Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> X117 Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Gettler Ryan/Geostrategies Client Project 1D Unocal 6981, 4855 19 <br /> 3164 Gold Camp Drive, #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter Work Order# 9709G57 -01 Reported Oct 7, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC100197BTEX03A GC100197BTEX03A GC100197BTEX03A GC100197BTEX03A GC100197BTEX03A <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 Miraftab A Miraftab A Miraftab A Miraftab A Miraftab <br /> MS/MSD # 970968002 970968002 9709138002 9709138002 970968002 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 10/1/97 10/1/97 10/1/97 10/1/97 10/1/97 <br /> Analyzed Date 10/1/97 10/1/97 10/1/97 10/1/97 10/1/97 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Cone Spiked 10 pg/L 10 pg/L 10 pg/L 30 pg/L 60 pg/L <br /> Result 90 90 91 25 45 <br /> MS % Recovery 90 90 91 83 75 <br /> 140 Dup Result 8 9 88 90 25 45 <br /> MSD % Recov 89 88 90 83 75 <br /> RPD 11 22 11 00 00 <br /> RPD Limit 0-25 0-25 025 0-25 0-25 <br /> LCS # BLK100197 BLK100197 BLK100197 BLK100197 BLK100197 <br /> Prepared Date 10/1/97 10/1/97 10/1/97 10/1/97 10/1/97 <br /> Analyzed Date 10/1/97 10/1/97 10/1/97 10/1/97 10/1/97 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Cone Spiked 10pg/L 10pg/L 10pg/1- 30pg/L 6apg/L <br /> LCS Result 90 90 90 25 68 <br /> LCS % Recov 90 90 90 83 113 <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 /> EQUOIA 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 /> VegoryProject Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9709G57 GET <1 <br />