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4D Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> =Sac�ramento Project Arco Site 6020,Manteca,CA P305040 <br /> 2Suite 300 Project Number WR36616 Reported <br /> S Project Manager Vernon P Elarth 05/15/03 20 19 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B <br /> Sequoia Analyhcal-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-5 P305040-01 Water Sam led 04/28/03 15 35 Received 05/01/03 16 00 <br /> Gasoline Range Organics ND 50 ug/1 1 3050178 05/07/03 05/07/03 EPA <br /> 8015B/8021B <br /> Benzene ND 050 <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate a a a-Trifluorotoluene 104% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 101 % 65-135 „ <br /> MW-6(P305040-011,211 Water Sampled 04/28/03 14 45 Received 05/01/03 ,16 00 <br /> Gasoline Range Organics 100 50 ug/l 1 3050178 05/07/03 05/07/03 EPA <br /> 8015B/8021B <br /> Benzene ND 050 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 050 <br /> _,Xylenes(total) ND 050 <br /> rro,ate a a a-Trtfluorotoluene 103% 65-135 „ <br /> Surrogate 4-Bromofluorobenzene 99% 65-135 <br /> 11W-7(P305040-0113)Water Sampled 04/28/03 15 25 Received 05/01/03 16 00 <br /> Gasoline Range Organics ND 50 ug/l 1 3050178 05/07/03 05/07/03 EPA <br /> 8015B/8021B <br /> Benzene ND 050 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 050 „ <br /> Xylenes(total) ND 050 <br /> Surrogate a a a-Trifluorotoluene 99% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 101 % 65-135 „ <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 3 of 12 <br />