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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-92.33 <br /> 404 N Wiget Lane Walnut Creel,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792 1865 FAX(707)792-0342 <br /> i <br />' Pacific Environmental Group-Sac Project Unocal 0123,Tracy,CA Sampled 10/22/98 <br /> 11315 Sunrise Gold Circle St M Project Number 910-017 l A Received 10/22/98 <br />' Rancho Cordova,CA 95742 Project Manager Mike Mitchener Reported 10/30/98 <br /> Total Purgeable Hydrocarbons(C6-C12),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 % Limit % Notes" <br /> Batch, 8100282 Date Prepared. 10/26/98 Extraction Method. EPA 5030B(PIT) <br /> Riank 8100282-BLKI <br /> Purgeable Hydrocarbons 10/26/98 ND ug/l 500 <br />' Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br />' Methyl tert-butyl ether ND I 500 <br /> Surrogate a a a-Trrfluorotoluene 100 101 600-140 101 <br />' I.f'S 8100282-BSl <br /> Benzene 10/26/98 100 10 7 ug/l 700-130 107 <br /> Toluene 10 0 993 70 0-130 993 <br /> Ethylbenzene 100 981 700-130 981 <br /> 10ylenes(total) " 300 296 " 700-130 987 <br /> —ethyl tert-butyl ether 100 8 89 700-130 88 9 <br /> Surrogate a a,a-Trifluorotoluene 100 100 600-140 100 <br />' Matrix Spike 8100282-MSI 5810218-02 <br /> Benzene 10/26/98 100 ND 107 ug/1 600-140 107 <br /> Toluene too ND 100 600-140 100 <br />' Ethylbenzene 100 ND 9 92 600-140 992 <br /> Xylenes(total) 300 ND 30 1 600-140 100 <br /> Methyl tert-butyl ether too 9 45 204 600-140 109 <br />' Surrogate a a a-Tri luorotoluene 100 9 74 rF 600-140 974 <br /> Matrix pike Dup 8100282-MSD1 S810218-02 <br /> Berizene <br /> - <br /> Benzene 10/26/98 100 ND 107 ug/l 600-140 107 25 0 0 <br /> Toluene 100 ND 102 600-140 102 25 0 198 <br /> Ethylbenzene 100 ND 999 600-140 999 250 0 703 <br /> Xylenes(total) 300 ND 302 600-140 101 250 0 995 <br /> Methyl tert-butyl ether 100 945 168 600-140 73 5 250 389 3 <br />' Surrogate a,a,a-Trifluorotoluene 100 9 71 600-140 97 1 <br /> Sequoia nalytical-Sacramento *Refer to end of report for text of notes and definitions <br /> G� f <br /> nda C Schnei or,Laboratory Director Page 7 of 12 <br />