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1955 McAowell Blvd,North forth Ste <br /> Sequoia P <br /> Petaluma CA 949544 <br /> D—W <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> ler-Ryan/Geostrategies(I) Project Unocal(4) <br /> Sierra Court, Suite J Project Number Former Unocal 40I87,Stockton Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 05/24/02 16 38 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 8021B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> U-1 (L205039-01)Water Sampled 05/09/02 16 30 Received 05/09/02 18 50 _ <br /> Purgeable Hydrocarbons as Gasoline 1000 250 ugA 5 2050047 05/21/02 05/21/02 EPA 8021B -- P-02 <br /> Benzene 23 25 <br /> Toluene 34 25 ^ " <br /> Ethylbenzene 5 9 25 <br /> Xylenes(total) 57 25 <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a a-Triuorololuene 114% 70-130 " <br /> U-2 (1.205039-02)Water Sampled 05/09/02 16 00 Received- 05/09/02 18 50 <br /> Purgeable Hydrocarbons as Gasoline 100 50 ug/1 1 2050047 05/21/02 05/21/02 EPA 8021B P-02 <br /> Benzene 59 0 50 1, " " <br /> Toluene ND 0 50 " ^ <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 050 " <br /> Methyl ten-butyl ether ND 5 0 ^ <br /> are aa a-Trifluorotoluene 106% 70-130 " <br /> L205039-03 Water_Sampled 05/09/02 15 25 Received 05/09/02 18 50 <br /> Purgeable Hydrocarbons as Gasoline 110 50 ugA 1 2050042 05/20/02 05/20/02 EPA 8021E P-01 <br /> Benzene 14 050 " <br /> Toluene 16 050 " <br /> Ethylbenzene 27 0 50 <br /> Xylenes(total) 37 050 " ^ <br /> Methyl ten-butyl ether ND 50 " <br /> Surrogate a,a a-Trtfluorotoluene 892% 70-130 " <br /> �ia Analytical - San Carlos The results to this report apply to the samples analymed in accordance wuh the chain of <br /> custody document This analytical report must be reproduced in its enurery <br /> Page 3 of 30 <br />