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Sequoia 1455 McDowcll Blvd North Ste <br /> Petaluma CA 949544 <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#0187 Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/24/02 16 38 <br /> Total Purgeable Hydrocarbon (C6-C]2) 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 /> NP-2-60(L205039-31)Water Sampled 05/09/02 11 45 Received_05109/02 18 50 - <br /> Purgeable Hydrocarbons as Gasoline 20000 10000 ugll 200 2050047 05/21/02 05/21/02 EPA 8021B P-01 <br /> Benzene 7600 100 ^ <br /> Toluene 310 100 <br /> Ethylbenzene 370 100 " <br /> Xylenes(total) 270 100 ^ <br /> Methyl tert-butyl ether ND 1000 ^ ^ <br /> Surrogate a,a,a-Trtfluorotoluene 10.5% 70-130 " <br /> NP-2-116(L205039-32)Water Sampled 05/09/02 10 35 Received 05/0910_2 18 50 <br /> Purgeable Hydrocarbons as Gasoline 780 50 ug/l 1 2050047 05/21/02 05/21/02 EPA 8021B P-01 <br /> Benzene 12 050 <br /> Toluene 2 6 050 <br /> Ethylbenzene 0 58 050 ^ <br /> Xylenes(total) 16 050 <br /> Methyl terl-butyl ether ND 50 " ^ <br /> gale a,a a-Triuorotoluene 161 % 70-130 S-04 <br /> B(L205039-33)Water Sampled 05/07/020000 Received 05109/02.1.8 50 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/I 1 2050040 05/18/02 05/18/02 EPA 8021B <br /> Benzene ND 050 " ^ <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 <br /> Methyl tert-butyl ether ND 50 " ^ <br /> Surrogate a,a,a-Tr fluorotoluene 984% 70-130 " <br /> to Analytical -San Carlos The results in this report apph to the samples analyzed in accordance wuh the chain of <br /> custody document This analytical report must be reproduced to its enttreq, <br /> Page 13 of 30 <br />