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Sequoia 680 Chitsapeake Drive Redwood City CA 94063 (650) 364 9600 17AX(650) 364 9233 <br /> 404 N %gtt Lane Walnut Greek, CA 94598 (510) 998 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue,suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> i <br /> 'Geitler Ryan/Geostrategtes Client Project ID Chevron 9-1848, Manteca' <br /> {3164 Gold Camp Drive, #240 Matrix Solid <br /> Rancho Cordova, CA 95670 <br /> -`Attention Greg Gurss Work Order# 9709993 -01-08 Reported Sep 26, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC092097BTEXEXA GC092097BTEXEXA GC092097BTEXEXA G0092097BTEXGXA GM92097BTEXEXA <br /> Analy. Method EPA 8020 CPA 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#- 970999306 970999306 970999306 970999306 970999306 <br /> Sample Conc . N D N D N D N D N D <br /> Prepared Date. 9/20/97 9/20/97 9/20/97 9/20/97 9/20/97 <br /> Analyzed Date. 9/20/97 9/20/97 9/20/97 9/20/97 9/20/97 <br /> Instrument 1 D #' GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc.Spiked' 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg ft 1 2 mg/Kg <br /> Result. 016 016 016 046 0 90 <br /> �MS % Recovery 80 so 80 77 75 <br /> DISI}. Result: 016 016 016 045 090 <br /> MSD %Recov : so so so 75 75 <br /> RPD 00 00 00 22 00 <br /> RPD Limit. 0-25 0-25 025 0-25 0-25 <br /> n r r <br /> LCS # BLK092097 13LK092097 BLK092097 BLK092097 BLK092097 <br /> Prepared Date 9/20/x7 9/20/97 9/20/97 9/20/97 9/20/97 <br /> Analyzed Date 9/22/97 9/22/97 9/22/97 9/22/97 9/22/97 <br /> Instrument I D #- GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked- 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result 017 016 0 16 047 090 <br /> LCS %Recov. 85 so 80 78 75 <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 /> EQUO]AANALYTICAL 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 4 <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due 10 matrix <br /> WIGregoryInterference,the LCS recovery is to be used to validate the batch <br /> Project Manager "*MStiMatrlx Spike, MSD=MS Duplicate,RPD=Relative%Difference 9709993 GET <1> <br />