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1455 McDowell Blvd,North Ste D <br /> (D— Sequoia Petaluma,CA 94954 <br /> Analytical (707)792-1845 <br /> illop equoi labs.c 42 <br /> www.sequoialabs.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-1(P312283-01)Water Sampled: 12/10/03 08:09 Received: 12/10/03 10:42 <br /> Chemical Oxygen Demand 20000 20000 ug/1 1 3120642 12/23/03 12/23/03 EPA 410.4 <br /> Orthophosphate as P 12.0 50 3120349 12/11/03 12/11/03 EPA 365.3 <br /> Total Dissolved Solids 870000 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-2(P312283-02)Water Sampled: 12/10/03 08:37 Received: 12/10/03 10:42 <br /> Chemical Oxygen Demand ND 20000 ugll 1 3120642 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 580000 10000 3120460 12/16/03 12/16/03 EPA 160.1 <br /> Total Organic Carbon ND 800 4 3120721 12/28/03 12/28/03 EPA 415.1 <br /> MW-3(P312283-03)Water Sampled: 12/10/03 08:23 Received: 12/10/03 10:42 <br /> Chemical Oxygen Demand ND 20000 ug/I 1 3120642 12/23/03 12/23/03 EPA 410.4 <br /> Orthophosphate as P ND 50 3120349 12/11/03 12/11103 EPA 365.3 <br /> otal Dissolved Solids 1400000 10000 11 3120460 12/16/03 12/16/03 EPA 160.1 <br /> ntal Organic Carbon 1400 R00 4 3120721 12/29/03 12/29/03 EPA 415.1 <br /> MW-4(P312283-04)Water Sampled: 12/10/03 07:55 Received: 12/10/03 10:42 <br /> Chemical Oxygen Demand 130000 20000 ug/l 1 3120642 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 860000 10000 3120432 12/15/03 12/15/03 EPA 160.1 QB-01 <br /> Total Organic Carbon 6900 800 4 3120721 12/28/03 12/28/03 EPA 415.1 <br /> MW-5(P312283-05)Water Sampled: 12/10/03 07:22 Received: 12/10/03 10:42 <br /> Chemical Oxygen Demand 28000 20000 ug/I 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 1000000 t0000 3120432 12/15/03 12/15/03 EPA 160.1 QB-01 <br /> Total Organic Carbon 990 800 4 3120721 12/28/03 12/28/03 EPA 415.1 <br /> 0Sequoia 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 21 of40 <br />