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i <br /> Gelder-Ryan/Geostrategtes(1) Project Unocal(4) <br /> rted <br /> 6747 Sierra Court,Suite J Project Number- Former UnocalSS#2859p° <br /> Dublin CA,94568 Project Manager Deanna Hardmg 02/23/0107 12 <br /> Total Purgeable Hydrocarbons (C6-C12)9 BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical-San Carlos <br /> Rqxntns Space Source %REC RPD <br /> cyte Result Lout Umts Level Result %REC limits RPD Lamm Notes <br /> Batch 1020058-EPA 5030B(P <br /> LCS(1020058-BSI) Prepared&A 02/21/01 <br /> Benzene 104 0 500 119/1 100 104 70-130 <br /> Toluene 102 0 500 100 102 70-130 <br /> gthylbenzene 104 0 500 100 104 70-130 <br /> Xylenes(total) 312 0 500 300 104 70-130 <br /> Surrogate a,a,a-Tnfluorotoluene 977 100 977 70-130 <br /> LCS(1020058-BS2) Prepared&Analyzed 02/21/01 <br /> Purgeable Hydrocarbons as Gasoline 282 500 ug/l 250 113 70-130 <br /> Surrogate a,a a-Tnfluorotoluene 993 " 100 995 70-130 <br /> Matrix Spike(1020058-MSI) Source L102074-08 Prepared&Analyzed 02/21/01 <br /> ble Hydrocarbons as Gasoline 275 500 ug/1 250 ND 110 60-140 <br /> gate a,a,a-Tnfluorotoluene 871 100 871 70-130 <br /> Matrix Spike Dup(102005&MSD1) Source-L102074-08 Prepared&Analyzed 02/21/01 <br /> Purgeable Hydrocarbons as Gasoline 260 Soo u9n 250 ND 104 60-140 561 25 <br /> Surrogate a,a,a-Tris luorotoluene 900 " 100 900 70-130 <br /> Batch 1020059-EPA 5030B <br /> Blank(1020059-BLKI) Prepared&Analyzed 02/21/01 <br /> Purgeable Hydrocarbons as Gasoline ND 500 ug/1 <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 500 " <br /> Surrogate a,a,a-TnfIuorotoluene 106 10 0 106 70-130 <br /> 1 <br /> AdIllk <br /> t101a Analytical-Sari Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Thus analytical report must be reproduced rn its entirety <br /> Page 8 of 10 <br />