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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Secor International Project Unocal 8671,Stockton,CA Sampled 5/11/98 <br /> 9912 Business Park Drive,Ste 100 Project Number N/A Received 5/11/98 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 5/13,5/27/98 <br /> Total Purgeable Hydrocarbons(C6-M),BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits °/a Limit % Notes* <br /> Batch, 8050121 Date Prepared 5112,,/98 Extraction Method. EPA 5QaOfl(MeOH) <br /> Blank 8050121-BLK1 <br /> Purgeable Hydrocarbons 5/12/98 ND mg/kg 1 00 <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 0 198 600-140 990 <br /> LES 8050121-BSl <br /> Benzene 5/12/98 0200 0 212 mg/kg 700-130 106 <br /> Toluene 0200 0 197 700-130 98 5 <br /> Ethylbenzene 0200 0 191 700-130 95 5 <br />&ylenes(total) 0 600 0 571 700-130 95 2 <br /> ethyl tert-butyl ether 0200 0 181 700-130 905 <br /> Surrogate a,a,a-Trifluorotoluene 0200 0201 600-140 101 <br /> Matrix Spike 8050121-MS1 5805055-07 <br /> Benzene 5/12/98 0200 ND 0 186 mg/kg 600-140 93 0 <br /> Toluene 0200 ND 0 176 600-140 880 <br /> Ethylbenzene 0200 ND 0 173 600-140 86 5 <br /> Xylenes(total) 0 600 ND 0 523 600-140 872 <br /> Methyl tert-butyl ether 0200 ND 0 184 600-140 920 <br /> Surrogate a a a-Trifluorotoluene 0200 0 185 600-140 925 <br /> ixpike Dun 8050121-MSD/ S805055-07 <br /> Benzene 5/12/98 0200 ND 0 193 mg/kg 600-140 965 25 0 3 69 <br /> Toluene 0200 ND 0 175 600-140 87 5 25 0 0 570 <br /> Ethylbenzene 0200 ND 0 177 600-140 88 5 25 0 2 29 <br /> Xylenes(total) 0 600 ND 0 533 600-140 888 25 0 182 <br /> Methyl tert-butyl ether 0200 ND 0 181 600-140 905 25 0 164 <br /> Surrogate a a a-Triuorotoluene 0200 0189 600-140 94 5 <br /> Batch, 8050129 Date Prepared. 5113198 Extraction Method. EPA 5030B(MeOH) <br /> Blank 8050129-BLKI <br /> Purgeable Hydrocarbons 5/13/98 ND mg/kg 100 <br /> Benzene ND 000500 <br /> Toluene ND 000500 <br /> Ethylbenzene ND 000500 <br /> Xylenes(total) ND 000500 <br /> ethyl tert-butyl ether ND 00500 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> c� <br /> Linda C Schneider,Laboratory Director Page 6 of 10 <br /> rv% <br />