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C�- Sequoia ]455 McDowell Blvd North Ste 4 Petaluma,CA 44954 <br /> 1965 <br /> Analytical {707)792-0342 <br /> T4WFAX(707) labs c m <br /> www sequoialabs com <br /> *r-Ryan/Geostratel2ies(I) Project Unocal(4) <br /> Sierra Court Suite J Project Number Former Unocal#10187,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 Analvzed Method Notes <br /> U-13 L205039-13 Water Sampled 05/08/02 17 30 Received 05/09/02 18 50 <br /> Purgeable Hydrocarbons as Gasoline 4400 2000 ug/1 40 2050040 05/18/02 05/18/02 EPA 8021E P-0I <br /> Benzene 1200 20 " <br /> Toluene 34 20 <br /> Ethylbenzene NO 20 " <br /> Xylenes(total) 49 20 " <br /> Methyl tert-butyl ether NO 200 <br /> Surrogate a,a,a-Trifluorotoluene 883% 70-130 " <br /> U-14(L205039-14)Water Sampled 05/07/02 15 15 _Received 05/09/02 18 50 -- - <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/1 .1 2050040 05/18/02 05/18/02 EPA 8021B <br /> Benzene 095 050 " <br /> Toluene 4 4 0 50 " <br /> Ethylbenzene 062 0 50 " <br /> Xylenes(total) 4 1 050 " <br /> Methyl Leri-butyl ether ND 5 0 " <br /> Sale a,a o-Triuorotoluene 931 % 70-130 <br /> U- (L205039-15)Water Sampled 05/07/02 16 03 Received 05/09/02 18 50 _ <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l 1 2050040 05/18/02 05/18/02 EPA 8021E <br /> Benzene 12 0 50 <br /> Toluene 5 9 0 50 " <br /> Ethylbenzene 094 050 ' <br /> Xylenes(total) 6 2 0 50 " <br /> Methyl tert-butyl ether NO 5 0 " <br /> Surrogate a,a,a-Trifluorotoluene 926% 70-130 " <br /> la 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 30 <br />