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1455 McDowell Blvd,North Ste D <br /> a— )%0Sequoia petaluma,CA 94954 <br /> (707)792-1865 Analyte ca FAX(707)792-0342 <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 1&12 <br /> Anions by EPA Method 300.0 - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source 0/.RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3L30021-General Preparation <br /> Blank(3L30021-BLK1) Prepared&Analyzed: 12/11/03 <br /> Nitrate as NO3 ND 500 ug/l <br /> Laboratory Control Sample(3L3002I-BSI) Prepared&Analyzed: 12/11/03 <br /> Nitrate as NO3 MI 500 ug/I 10000 96.1 90-110 <br /> Matrix Spike(3L30021-MSI) Source: P312283-05 Prepared&Analyzed_: 12_/11/03 <br /> Nitrate as NO3 185000 5000 ug/1 100000 72000 113 80-124 <br /> Matrix Spike Du (31,30021-MSDI) Source: P312283-05 Prepared&Analyzed: 12/11/03 <br /> Nitrate as NO3 184000 5000 UgA 100000 72000 112 80-124 0.542 10 <br /> Batch 4AO4018-General Preparation <br /> Blank(4A04018-BLKI) Prepared&Analyzed:01/04/04 <br /> �ulfate as SO4 ND 500 ug/I <br /> ahoratory Control Sample(4A04018-BSI) Prepared&Analyzed:01/04/04 <br /> Sulfate as SO4 10300 500 ug/l 10000 103 90-110 <br /> Matrix Spike 4A04018-MSl Source: MML0385-01 Prepared&Analyzed:01/04/04 <br /> Sulfate as SO4 121000 5000 ug/1 100000 12000 109 72-140 <br /> Matrix Spike(4A04018-MS2) Source: P312283-01 Prepared&Analyzed: 01/04/04 _ <br /> Sulfate as SO4 127000 5000 ug/l 100000 17000 110 72-140 <br /> Matrix Spike Dup(4A04018-MSD1) Source: MML0385-01 Prepared&Analyzed: 01/04/04 <br /> Sulfate as SO4 121000 5000 ug/l 100000 12000 109 72-140 0,00 10 <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 stared, results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety, <br /> Page 24 of 40 <br />