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Sequoia 1551 <br /> on Carlos <br /> 94070 <br /> + Road <br /> San Carlos CA 94070 <br /> r Analytical <br /> (650)232 9600 <br /> FAX(650)232 9612 <br /> www sequoialabs cam <br /> tler-Ryan/GCOStrategies(I} Project Tosco(1) <br /> Sierra Court,Suite J Project Number Unocal SS#08671,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 02/28/02 11 15 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT- Quallty Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2B20001 -EPA 5030B PIT <br /> LCS(2B20001-BSI) Prepared&Analyzed 02/20/02 <br /> Benzene 20 0 0 50 ug11 200 100 70-130 <br /> Toluene 204 0 50 200 102 70-130 <br /> Ethylbenzene 181 0 50 200 90 70-130 <br /> Xylenes(total) 563 0 50 600 94 70-130 <br /> Surrogate a a a-DiJluorotoluene 323 300 108 70-130 <br /> LCS(2B2000]-BS2 Prepared&Analyzed 02/21/02 <br /> Benzene 21 2 0 50 UO 200 106 70-130 <br /> Toluene 21 2 0 50 200 106 70-130 <br /> Ethylbenzene 186 0 50 200 93 70-130 <br /> Xylenes(total) 58 0 0 50 600 97 70-130 <br /> Surrogate a,a,a-Tris luorotoluene 33 7 300 112 70-130 <br /> L (2B20001-11IS3) Prepared&Analyzed 02/20/02 <br /> We 174 0 50 ug/l 200 87 70-130 <br /> Toluene 19 1 050 200 96 70-130 <br /> Ethylbenzene 19 8 0 50 200 99 70-130 <br /> Xylenes(total) 599 0 50 600 100 70-130 <br /> Surrogate a a,a-D ifluoi otoluene 31 3 300 104 70-130 <br /> LCS(2B20001-BS4) Prepared&Analyzed _02122/02 <br /> Benzene 205 050 u8A 200 102 70-130 <br /> Toluene 21 7 0 50 200 108 70-130 <br /> Ethylbenzene 206 0 50 200 103 70-130 <br /> Xylenes(total) 63 9 0 50 600 106 70-130 <br /> Surrogate a,a,a-Diflumoroluene 341 300 114 70-130 <br /> Matrix Spike(2B2000]-MSI) Source L202080-07 Prepared 02/20/02 Analyzed 02/21/02 <br /> Benzene 200 0 50 ug/l 200 ND 100 70-130 - <br /> Toluene 19 7 0 50 200 ND 98 70-130 <br /> Ethylbenzene 181 0 50 200 ND 90 70-130 <br /> Xylenes(total) 562 050 60 0 ND 94 70-130 <br /> Surrogate a,a,a-Trifluorotoluene 34 7 300 116 70-130 <br /> SI&a Analytical - San Carlos The i esults in this i epos t apply to the samples analyzed in accoidance with the chain <br /> of custody document This analytical i epos t must he repi oduced in its entirety <br /> Page 14 of 16 <br />