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Sequoia 3455 McDowell Blvd,North Ste <br /> Petaluma,CA 949544 <br /> 4D <br /> A nalytica (707)792-1865 <br /> FAX 707 792-0342 <br /> 4 <br /> www.seguoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <br /> Conventional Chemistry Parameters by APHA/EPA Methods <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-6(P312283-06)Water Sampled: 12/10/03 06:50 Received: 12/10/03 10:42 <br /> Chemical Oxygen Demand 140000 20000 ugll 1 3120641 12/23/03 12/23/03 EPA 410.4 <br /> Orthophosphate as P ND 50 3120349 12/11/03 12/11/03 EPA 365.3 <br /> Total Dissolved Solids 830000 10000 3120432 12/15/03 12/15/03 EPA 160.1 QB-01 <br /> Total Organic Carbon 8800 800 4 3120721 12/28/03 12/28/03 EPA 415.1 <br /> MW-7(P312283-07)Water Sampled: 12/10/03 04:27 Received: 12/10/03 10:42 <br /> Chemical Oxygen Demand 31000 20000 ug/l 1 3120641 12/23/03 12/23/03 EPA 410.4 <br /> Orthophosphate as P ND 50 3120349 12/11/03 12/11/03 EPA 365.3 <br /> Total Dissolved Solids 730000 10000 3120432 12/15/03 12/15/03 EPA 160.1 QB-01 <br /> Total Organic Carbon 800 800 4 3120721 12/28/03 12/28/03 EPA 415.1 <br /> MW-8(P312283-08)Water Sampled: 12/10/03 05:25 Received: 12/10/03 10:42 <br /> Chemical Oxygen Demand 120000 20000 ugh 1 3120641 12/23/03 12/23/03 EPA 410.4 <br /> Orthophosphate as P ND 50 3120349 12/11/03 12/11/03 EPA 365.3 <br /> otal Dissolved Solids 870000 10000 ;i 3120432 12/15/03 12/15/03 EPA 160.1 QB-0i <br /> otal Organic Carbon 6600 800 4 3120721 12/28/03 12/28/03 FPA 415.1 <br /> MW-9(P312283-09)Water Sampled: 12/10/03 04:13 Received: 12/10/03 10:42 <br /> Chemical Oxygen Demand 35000 20000 ug/l 1 3120641 12/23/03 12!23/03 EPA 410.4 <br /> Orthophosphate as P ND 50 3120349 12/11/03 12111/03 EPA 365.3 <br /> Total Dissolved Solids 770000 10000 3120432 12/15/03 12/15/03 EPA 160.1 QB-01 <br /> Total Organic Carbon ND 800 4 3120721 12/28/03 12!28/03 EPA 415.1 <br /> MW-10(P312283-10)Water Sampled:12/10/03 05:11 Received: 12/10/03 10:42 <br /> Chemical Oxygen Demand 20000 20000 ug/l 1 3120641 12/23/03 12/23/03 EPA 410.4 <br /> Orthophosphate as P ND 50 3120349 12/11/03 12/11/03 EPA 365.3 <br /> Total Dissolved Solids 710000 10000 3120432 12/15/03 12/15/03 EPA 160.1 QB-01 <br /> Total Organic Carbon 1200 800 4 3120721 12/28/03 12/28/03 EPA 415.1 <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 slated, results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 22 of 40 <br />