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1551 lndustnal Road <br /> Sequoia San Carlos CA 94070 <br /> (650) <br /> (650)232-9600 <br /> As0)732-9612 <br /> Analytical <br /> www w sqequowlabs coin <br /> �r-Ryan/Geostrategies(1) Project Tosco(1) <br /> Sierra Court,Suite J Project Number Unocal SS#08671, Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 12/06/01 15 09 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 8021B- Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1120003-EPA 5030B <br /> Blank(1120003-BLKI) Prepared&Analyzed 12/03/01 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl ten-butyl ether ND 50 " <br /> Surrogate a a a-7'rruorotoluene 799 100 799 70-130 <br /> LCS(1120003-BSI) Prepared&Analyzed 12/0310) <br /> Benzene 928 050 ug/l 100 928 70-130 <br /> Toluene 103 050 100 103 70-130 <br /> Ethylbenzene 108 0 50 100 108 70-130 <br /> hX,y],enes(total) 324 050 300 108 70-130 <br /> to a,a,a-Tr�uorotoluene 9 44 100 944 70-130 <br /> LCS(1120003-BS2) Prepared&Analyzed 12/03/01 <br /> Purgeable Hydrocarbons as Gasoline 228 50 ugfl 250 912 70-130 <br /> Surrogate a,a,a-Triuorotoluene 894 100 894 70-130 <br /> Matrix Spike(1120003-MSI) Source L111140-21 Prepared 12/03/01 Analyzed 12/04/01 <br /> Benzene 108 0 50 ug/1 100 ND 108 60-140 <br /> Toluene 106 0 50 100 ND 106 60-140 <br /> Ethylbenzene 105 050 100 ND 105 60-140 <br /> Xylenes(total) 31 6 0 50 300 ND 105 60-140 <br /> Surrogate aaa-Trifluororoluene 958 100 958 70-130 <br /> Matrix Spike Dup(1120003-MSD1) Source L111140-21 Prepared 12/03/01 Analyzed I2/04/01 <br /> Benzene 107 050 ug/l 100 ND 107 60-140 0 930 25 <br /> Toluene 105 050 100 ND 105 60-140 0 948 25 <br /> Ethylbenzene 104 050 100 ND 104 60-140 0 957 25 <br /> Xylenes(total) 313 050 n 300 ND Wil 60-140 0 954 25 <br /> Surrogate a a a-Triuorotoluene 100 100 100 70-130 <br /> is Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 7 of 10 <br />