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4D Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(51o)988 9673 <br /> �I, ► Analytical 819 Sinker Avenue,Suite a Sacramento CA 95834 (916) 921 9600 FAX(916)921 oioo <br /> Delta Environmental Consultants n dIlent Prolect ID Exxon 7,3708, D09-809 n n <br /> 23164 Gold Camp Drive, #200 Matrix Liquid <br /> iRancho Cordovat, CA 95670 <br /> ,Attention Keoni Almeida Work Order# 970SD19-01-08_ Reported Sep 5, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GCO82897BTEX02A GCO82897BTEX02A GCO8289713TEX02A GC082897BTEX02A GC0828976TEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method EPA 5o3o EPA 5030 EPA 5o3o EPA 5030 EPA 5030 <br /> Analyst A Miraftab A Miraftab A.Miraftab A.Miraftab A Miraftab <br /> MS/MSD # 97o8C7104 970807104 970SC7104 970807104 970807104 <br /> Sample Conc • N D N D N D N D N D <br /> Prepared Date 8/28/97 8/28/97 8/28/97 8/28/97 8/28/97 <br /> Analyzed Date 8/28/97 8/28/97 8/28/97 8/28/97 8/28/97 - <br /> Instrument LD # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked- 10pg/L 10.ug/L 10u9/L 30ug/L 60ug/L <br /> Result: 71 64 69 19 50 <br /> MS % Recovery 71 64 69 63 $3 <br /> 0 Dup. Result: 11 98 10 30 72 <br /> MSD % Recov 110 98 100 100 120 <br /> RPD 43 42 37 45 36 <br /> RPD Limit. 0-25 0-25 0.25 0-25 0-25 <br /> LCS # BLK082897 BLK082897 BLK082897 BLK082897 BLK082897 <br /> Prepared Date 8/28/97 8/28/97 8/28/97 8/28/97 8/28/97 <br /> Analyzed Date- 8/28/97 8/28/97 8/28/97 8/28/97 8/28/97 <br /> Instrument I D #• GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked: long/L 10ug/L 10ug/L 30ug/L 60pg/L <br /> LCS Result 10 99 10 31 66 <br /> LCS % Recov. 100 99 100 103 110 <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-fres matrix that is analyzed using the same reagents, <br />"UOIA a ALYTICAL 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 /> regory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9708019 DLT <2> <br />