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19 <br /> Sequoia Sacramento rCA 95934 <br /> (9 16)921-9600 <br /> AnaNtical FAX 1916)92 1-0100 <br /> www sequoialabs cam <br /> tler-Ryan-Dublin Project Former Unocal 5098,Stockton,CA 5305190 <br /> 16747 Sierra Court,Ste 3 Project Number NIA Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 05/21/03 17 32 <br /> Gasohne\BTEXIOxygenates by EPA method 8260B <br />' Sequoia Analytical - Sacramento <br /> Reporimg <br /> nalyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-21S(5305190-25)Water Sampled 05/04/03 11 45 Received 05/06/03 17 50 <br /> enzene ND 050 ug/l 1 ;050179 05/12/03 05/12/03 EPA 8260B <br /> luene ND 050 <br /> liylbenzene ND 0.50 " <br /> Xylenes(total) ND 050 <br /> ethyl terl-butyl ether ND 2 0 " <br /> rrogate 1 2-DCA-d4 110 % 60-140 " <br /> Surrogate Toluene-d8 105 % 60-140 " <br /> Ii rogale 4-BFB 74 % 60-140 <br /> W-21D(5305190-26)Water Sampled 05/04/03 12 10 Received 05/06/03 17 50 <br /> Benzene ND 050 ug/l 1 3050179 05/12/03 05/12/03 EPA 8260B <br /> uene ND 050 <br /> tylbenzenc <br /> ND 050 <br /> Xylenes(total) ND 050 " <br /> mhaiwl Cert-butyl ether ND 2 0 <br /> Mate 12-DCA-d4 110 % 60-140 " <br /> Sur robaie Toluene-d8 109 % 60-140 <br /> Crr-22S <br /> ogate 4-BFB 70 % 60-140 <br /> (S305190-27)Water Sampled 05/04/03 12 45 Received 05/06/03 17 50 _— <br /> Benzene ND 050 ugll 1 3050179 05/12/03 05/12!03 EPA 82608 <br /> �I'nes <br /> acne ND 050 " <br /> ylbenzene ND 050 <br /> (total) ND 050 " <br /> Methyl ter!-butyl ether ND 2 0 " <br /> i ogaie 1 2-DCA-d4 106 % 60-140 <br /> r rogate Toluene-d8 112%, 60-140 <br /> Sui r ogaie 4-BFB 77:; 60-140 <br /> i, <br /> f <br /> a Analyttedl - Sael amento The results in this i eport apph,to the samples anah7ed in accordance with the chain of <br /> custody document Unles s otheni ise stated results are reported on a wet we)ghi has is <br /> This anahirwal repot i mull be i eproduccd in its entirely <br /> I <br /> Page 17 of 121 <br />