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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 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Iwo- <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 (C6-02),BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Notes* <br /> PL-1 5805137-00 S" <br /> Purgeable Hydrocarbons 8050121 5/12/98 5/12/98 200 824 mg/kg i <br /> Benzene 0 100 0 232 <br /> Toluene 0100 153 " <br /> Ethylbenzene 0 100 0 777 " <br /> Xylenes(total) 0 100 596 " <br /> Methyl tert-butyl ether 1 00 348 " <br /> Surrogate a a a-Trifuorotoluene 600-140 980 % <br /> FUL 2 5805137-01 5411 <br /> Purgeable Hydrocarbons 8050129 5/13198 5/13/98 1 00 ND mg/kg <br /> Benzene 000500 ND " <br /> Toluene 000500 000594 " <br /> Ethylbenzene 000500 ND,wa " <br /> ylenes(total) 000500 00316 " <br /> ethyl tert-butyl ether 00500 ND " <br /> Surrogate a a a-Triuorotoluene 600-140 92 5 <br /> PL-3 5805137-02 ml <br /> Purgeable Hydrocarbons 8050121 5/12/98 5112/98 1 00 ND mg/kg <br /> Benzene 000500 ND " <br /> Toluene 000500 ND " <br /> Ethylbenzene 000500 ND " <br /> Xylenes(total) 000500 ND <br /> Methyl tert-butyl ether 00500 0 295 " <br /> Surrogate a a a-Trrfuorotoluene 600-140 950 <br /> SW-1 S805137-03 Sntl <br /> Purgeable Hydrocarbons 8050121 5/12/98 5/12/98 1 00 ND mg/kg <br /> Benzene 000500 ND " <br /> Toluene 000500 ND " <br /> Ethylbenzene 000500 ND " <br /> Xylenes(total) 000500 ND " <br /> Methyl tert-butyl ether 00500 ND " <br /> Surrogate a a,a-Trifluorotoluene 600-140 905 % <br /> PL-4 5805137-04 Ssil <br /> Purgeable Hydrocarbons 8050121 5/12/98 5112198 500 330 mg/kg 1 <br /> Benzene 0 250 ND " <br /> Toluene 0 250 ND " <br /> Ethylbenzene 0 250 2 51 " <br /> ylenes(total) 0 250 542 " <br /> —Sequoia Ana�lytical-Sacramento d *Refer to end of report for text of notes and definitions <br /> Linda C Schneider,Laboratory Director Page 2 of 10 <br />