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Sequoia San Carlos industrial7 -41 11 <br /> (650)232-9600 <br /> Analytical FAX(650) 232-9612 <br /> Genler-Ryan/Geostrategies(1) Project Unocal(I) Sampled 12/13/99 <br /> 6747 Sierra Court,Suite D Project Number Unocal SS#5098 Received 12/14/99 <br /> Dublin,CA 94568 Project Manager Scott Polston Reported 12/29/99 <br /> Total Purgeable Hydrocarbons(C6-C12)and BTEX by DHS LUFT/Quality Control <br /> Sequoia Analytical-San Carlos <br /> Date Spike Sample QC Reporting Lumt Recov RPD RPD <br /> Ana! a Analyzed Level Result Result Units Recov Limits % Limit IN Notes* <br /> Batch: 9120116 Date Prepared 12/23/99 Extraction Method- EPA 5030B fP/Tl <br /> Blank 9120116-BLK1 <br /> Purgeable Hydrocarbons as Gasoline 12/23/99 ND ug/l 500 <br /> Benzene it ND " 0.500 <br /> Toluene It <br /> ND to 0.500 <br /> Ethylbenzene to ND 0.500 <br /> Xylenes(total) " ND 0.500 <br /> Surrogate a,a,a-TrrfTuorotaluene M100 106 600-140 106 <br /> LCS 9120116-BS 1 <br /> Benzene 12/23/99 100 787 ug/l 700-130 78 7 <br /> 'uene 10 0 766 700-130 76 6 <br /> y lbenzene 100 803 700-130 803 <br /> xylenes(total) 300 23 9 700-130 79 7 <br /> Su to a a,a-Triuorotoluene 100 922 600-140 922 <br /> LCS 9120116-BS2 <br /> Purgeable Hydrocarbons as Gasoline 12/23/99 250 274 ug/l 700-130 - 110---- <br /> Surrogate <br /> 110 _Surrogate a a a-Tri luorotoluene IF <br /> 100 104 600-140 104 <br /> Matrix_Snike 9120116-MSI L912106-13 <br /> Benzene 12/23/99 100 ND 8 61 ug/l 600-140 861 <br /> Toluene 11100 ND 867 11600-140 867 <br /> Ethylbenzene 10 0 ND 890 600-140 890 <br /> Xylenes(total) 300 ND 262 600-140 873 <br /> Surrogate a,a,a-Triuorotoluene 100 109 600-140 109 <br /> Matrix Spike Du p 9120116-MSDI L912106-13 <br /> Benzene 12/23/99 100 ND 925 ug/l 600-140 925 25 0 717 <br /> Toluene IF 10 0 ND 900 " 600-140 900 25 0 374 <br /> Ethylbenzene 100 ND 929 to600-140 929 25 0 429 <br /> Xylenes(total) 300 ND 275 to600-140 917 25 0 4 92 <br /> Surrogate a,a a-Triuorotoluene 100 114 11600-140 114 <br /> Batch 9120117 Date Prepared 12/23/99 Extraction Method EPA 50308 IPM <br /> Blank 9120117-BLK1 <br /> Purgeable Hydrocarbons as Gasoline 12/23/99 ND ug/1 500 <br /> Benzene IfND 110 500 <br /> Toluene ofND of 0 500 <br /> Ethylbenzene to ND 41 0 500 <br /> Xylenes(total) 1. ND 91 0 500 <br /> S*to a,a,a-Trifluorotoluene IF 10 0 8 72 IF 600-140 872 <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of notes and definitions <br /> Page 20 of 31 <br />