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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 96W FAX(510)988 9 73' <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> E <br /> bria Environmental Project Shell,2494 Fremont,Stockton,CA Sampled 4/24/98 <br /> erkins Street Project Number N/A Received 4/27/98 <br /> ma,CA 95476 Project Manager Mike Mu by Reported 5/12198 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Se Analytical-Sacramento <br /> i 4 Y <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Nates* <br /> Batch, 8050022 Date Prepared, 514198 Extraction Method, EPA 503013(MeOH) <br /> Blank 8050022-BLK1 <br /> Purgeable Hydrocarbons 5/4/98 ND mg/kg 100 <br /> Benzene ND 000500 <br /> Toluene ND 000500 <br /> Ethylbenzene ND 000500 <br /> Xylenes(total) ND 000500 <br /> Methyl tert-butyl ether ND 00500 <br /> Surrogate a a a-Trifluorotoluene 0200 0202 600-140 101 <br /> LSU 8050022-BS1 <br /> Benzene 5/4/98 0200 0203 mg/kg 700-130 101 <br /> Toluene 0200 0 189 700-130 945 <br /> Ethylbenzene 0200 0 185 700-130 925 <br /> Xylenes(total) 0 600 0 551 700-130 918 <br /> A111111111thyl tert-butyl ether 0200 0 178 700-130 890 <br /> agate a a,a-Triuorotoluene 0200 0206 600-140 103 <br /> Matrix Spike 8050022-MSI S804235-07 <br /> Benzene 514/98 0200 ND 0 190 mg/kg 600-140 950 <br /> Toluene 0200 ND 0 178 600-140 89 0 <br /> Ethylbenzene 0200 ND 0 176 600-140 880 <br /> Xylenes(total) 0 600 ND 0 533 600-140 888 <br /> Methyl tert-butyl ether 0200 ND 0205 600-140 102 <br /> Surrogate a,a,a-Trafluorotoluene 0200 0 210 600-140 105 <br /> Matrix Spike Dun 8050022-MSD/ 5804235-07 <br /> Benzene 5/4/98 0200 ND 0 187 mg/kg 600-140 935 25 0 159 <br /> Toluene 0200 ND 0 178 600-140 890 25 0 0 <br /> Ethylbenzene 0200 ND 0 175 600-140 875 25 0 0 570 <br /> Xylenes(total) 0 600 ND 0 532 600-140 887 25 0 0 113 <br /> Methyl tert-butyl ether 0200 ND 0206 600-140 103 25 0 0 976 <br /> Surrogate a,a,a-Trafluorotoluene 0200 0206 600-140 103 <br /> Batch, 8050084 Date Prepared, 515198 Extraction Method, EPA 5030E MeM <br /> Man k 8050084-BLKI <br /> Purgeable Hydrocarbons 5/5198 ND mg/kg 100 <br /> Benzene ND 000500 <br /> Toluene ND 000500 <br /> Ethylbenzene ND 000500 <br /> Xylenes(total) ND 000500 <br /> Methyl tert-butyl ether ND 00500 <br /> uoia A Eytual-Sacramento *Refer to end of report for text of notes and definitions <br /> da C Schneider,Laboratory Director Page 3 of 5 <br />