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Blvd, <br /> Nort <br /> Sequoia ]455McDo+yell alt4m .CA Ste 4 <br /> Petaluma,CA 94954 <br /> (707)792-1665 <br /> Analytical FAX(707)792-0342 <br /> www scquoialabs com <br /> tler-Ryan/Geostratep-tes(I Project Unoca](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-C12) by EPA 8015M and BTEX/MTBE by EPA 80211B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Lima Units Dilution Batch Prepared Analyzed Method Notes <br /> U-25(L205039-25)Water Sampled 05/08/02 12 23 Received 05/09/02_]_8 50 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/I 1 2050042 05/20/02 05/20/02 EPA 8021B <br /> Benzene 066 050 <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-Triuorotoluene 106% 70-130 " <br /> U-26(L205039-26)Water Sampled 05/08/02 18 22 Received 05/09/02 J8 50 <br /> Purgeable Hydrocarbons as Gasoline 66 50 ug/I 1 2050047 05/21/02 05/21/02 EPA 8021B P-02 <br /> Benzene 075 050 ^ <br /> Toluene 3 5 050 <br /> Ethylbenzene 0 52 0 50 ^ <br /> Xylenes(total) 33 0 50 ^ <br /> Methyl tert-butyl ether ND 50 <br /> gale a,a a-Trifluorotoluene 109% 70-130 " <br /> -22(L205039-27)Water Sampled 05/09/02 I3 45 Received 05/09/02 18 50 <br /> Purgeable Hydrocarbons as Gasoline 9000 2500 ug/l 50 2050047 05/21/02 05/21/02 EPA 8021B P-01 <br /> Benzene 260 25 " ^ <br /> Toluene 67 25 " <br /> Ethylbenzene 350 25 ^ <br /> Xylenes(total) 960 25 ^ <br /> Methyl tent-butyl ether ND 250 <br /> Surrogate a,a a-Trifluormoluene 104% 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 he reproduced in its entiret)> <br /> Page 11 of 30 <br />