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k a 1551 Industrial Road <br /> Sequoia l San Carlos CA94070 <br /> 23 <br /> (650)232-9600 <br /> y. Anal., a FAX equoi labs.c 12 <br /> Y! l www.sequoialabs.com <br /> �-T-Ryan/Gec,sIrategies0 Project: Tosco(1) <br /> 67e7 Sierra Court. Suite J Project Number: Unocal SSti08671,Stockton;CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 09/05/01 07:36 <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 °/6REC RPD <br /> J` Analyte Result Limit Units Level Result %REC limits RPD Limit Notes <br /> Batch 1090001 - EPA 5030B(PIT) <br /> LCS(]090001-BS4) Prepared&Analyzed:09/03/0I <br /> Benzene 8.91 0.50 ug1l 10.0 89.1 70-130 <br /> Toluene 8.98 0.50 10.0 89.8 70-130 <br /> Ethylbenzene 9.12 0.50 10.0 91.2 70-130 <br /> Xylenes(total) 27.0 0.50 30.0 90.0 70-130 <br /> Surrogate:a,o,a-Trifluorololuene 9.80 10.0 98.0 70-130 1 <br /> LCS(1090001-BS5) Prepared&Analyzed:09/03/01 <br /> Purgeable Hydrocarbons as Gasoline 232 50 ug/l 250 92.8 70-130 <br /> Surrogate:a,o,o-Tri luoroialuene 10.1 10:0 101 70-130 <br /> Matrix Spike(1090001-NISI) Source: L108144-04 Prepared&Analyzed:09/03/01 <br /> Purgeable Hydrocarbons as Gasoline 228 50 ugA 250 ND 91.2 60-140 <br /> Surrogate:a,a,a-Triuorotoluene 9.91 10.0 .99J.— 70-130 <br /> Ntrtit Spike Dup(1090001-MSDI) Source: L108144-04 Prepared&Analyzed:09/03/01 <br /> Purgeable Hydrocarbons as Gasoline 239 50 ugl] 250 ND 95.6 60-140 4.71 25 <br /> Surrogate:a,a,a-Trifluorotoluene 9.82 10:'0 98.2 70430 <br /> I <br /> I <br /> x <br /> } <br /> . l: <br />' I1 <br /> 4 <br /> l <br /> s. <br /> t <br /> t S ,'ia 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 muss be reproduced in its entirety. <br /> i <br />{ <br /> i <br /> Page 7 of 10 <br />( <br />