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^V""! 1455 McDow <br /> Sequoia Petaluma,CA 94954 <br /> elk Blvd,North Ste 4 <br /> Analytical FAX(707)792-1865 <br /> (707)792-0342 <br /> tivww.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469, Stockton,CA P305380 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number; WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/18/03 21:10 <br /> Conventional Chemistry Parameters by APHA/EPA Methods <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-9(P305380-09)Water Sampled:05/19/0304:58 Received:05/19/03 11:45 <br /> Chemical Oxygen Demand ND 20000 ug/1 1 3060030 06/02/03 06/02/03 EPA 410.4 <br /> Dissolved Oxygen 8800 100 3050607 05/19/03 05/19/03 EPA 360.1 <br /> Ferrous Iron ND 100 3050521 05/19/03 05/19/03 SM 3500 Fe D <br /> Phosphorus 64 50 3050535 05/20/03 05/20/03 EPA 365.3 <br /> Total Dissolved Solids 850000 10000 3050516 05/20/03 05/20/03 EPA 160.1 <br /> Total Organic Carbon 910 800 4 3050585 05/22/03 05/22/03 EPA 415.1 <br /> MW-10(P305380-10)Water Sampled:05/19/03 06:00 Received:05/19/03 11:45 <br /> Chemical Oxygen Demand 20000 20000 ug/1 1 3060030 06/02/03 06/02/03 EPA 410.4 <br /> Dissolved Oxygen 6600 100 3050607 05/19/03 05/19/03 EPA 360.1 <br /> Ferrous Iron ND 100 3050521 05/19/03 05/19/03 SM 3500 Fe D <br /> Phosphorus ND 50 3050535 05/20/03 05/20/03 EPA 365.3 <br /> Total Dissolved Solids 750000 10000 3050516 05/20/03 05/20/03 EPA 160.1 <br /> Total Organic Carbon 1800 800 4 3050585 05/22/03 05/22/03 EPA 415.1 <br /> • <br /> equoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 20 of 36 <br />