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A <br /> Sequoia San Carlos,X940`70 4�d <br /> 4 (650) 232-9600 <br /> Analytical FAX(650) 232-9612 <br /> 0 <br /> Settler-Ryan/Geostrategies(1) Project Unocal(1) Sampled 12/13/99 <br /> 6747 Sierra Court,Suite D Project Number Unocal SS#5098 Received 12/14/99 <br /> Dublin,CA 94568 Pro ect Mana er ScottPolston Reported 12/29/99 <br /> Total Purgeible Hydrocarbons(C6-C12)and BTEX by�DHS LUFIYQuality Control <br /> Sequoia Analytical-San Carlos <br /> Date Spike Sample QC Report-mg Limit Recov RPD RPD <br /> Malyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> LCS 9120118-BS2 <br /> Purgeable Hydrocarbons as Gasoline 12/23/99 250 263 ug/l 700-130 105 <br /> Surrogate a,a,a-Tnfluorotoluene " 100 121 ef600-140 121 <br />.Matrix S_pik_e 9120118-MSI L912106-14 <br /> Benzene 12/24/99 100 ND 106 ug/l 600-140 106 <br /> Toluene 100 ND 104 0 600-140 104 <br /> Ethylbenzene 100 ND 107 It <br /> 600-140 107 <br /> Xylenes(total) 300 ND 31 8 " 600-140 106 <br /> Surrogate a aa-Tnrfluorotoluene 100 995 600-140 995 <br /> Matrix Spike Dun 9120118-MSD1 L912106-14 <br /> Benzene 12/24/99 100 ND 986 ugll 600-140 986 250 7 23 <br /> toluene 100 ND 968 600-140 968 250 7 17 <br /> zene 100 ND 9 87 600-140 98 7 250 8 07 <br />%y (total) 300 ND 291 600-140 970 25 0 887 <br /> Surrogate a a a-Trifluorotoluene " 100 9 80 600-140 98 0 <br /> Batch 9120122 Date Prepared 12/24/99 Extraction Method EPA 5030B fPIT <br /> Blank 9120122-BLKI <br /> Purgeable Hydrocarbons as Gasoline 12/24/99 ND u9A 50 0 <br /> Benzene 10ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Surrogate a,a,a-Trrfluorotoluene " 100 118 600-140 118 <br /> Blank 9120122-BLK2 <br /> Purgeable Hydrocarbons as Gasoline 12/25/99 ND ug/l 500 <br /> Benzene " ND 0 500 <br /> Toluene 11ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> a�-. ate „a 10 0 120 " 600-140 120 <br /> LCS 9120122-BS1 <br /> Benzene 12/24/99 100 873 ug/1 700-130 873 <br /> Toluene 100 882 700-130 882 <br /> Ethylbenzene 100 9 14 700-130 914 <br /> Xylenes(total) to300 277 700-130 923 <br /> Surrogate a,a,a-Tnfluorotoluene Ft100 113 FF600-140 113 <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of notes and definitions <br /> Page 22 of 31 <br />