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` 885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)7 -9600 <br /> Analyfic$!i FAX(aos)782sz-s3ox <br /> www.sequoialabs.co n <br /> Stratus Environmental Inc. Project: ARCO#5469,Stockton,CA MLL0827 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 01/07/03 13:36 <br /> Anions by EPA Method 300.0 -Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2L31041 -General Preparation <br /> Blank(2L31041-BLK1) Prepared&Analyzed: 12/27/02 <br /> Nitrate as NO3 ND 0.50 mg/l <br /> Nitrite as NO2 ND 0.50 " <br /> Sulfate as SO4 ND 0.50 " <br /> Laboratory Control Sample(2L31041-BSl) Prepared&Analyzed: 12/27/02 <br /> Nitrate as NO3 10.2 0.50 mg/l 10.0 102 87-113 <br /> Nitrite as NO2 5.20 0.50 5.00 104 90-111 <br /> Sulfate as SO4 10.3 0.50 10.0 103 88-113 <br /> Matrix Spike(2L31041-MS 1) Source:MLL0827-06 Prepared&Analyzed: 12/27/02 <br /> Nitrate as NO3 1050 50 mg/I 1000 ND 105 87-113 <br /> Nitrite as NO2 508 50 500 ND 102 90-111 <br /> Sulfate as SO4 1130 50 1000 52 108 88-113 <br /> Matrix Spike Dup(2L31041-MSD1) Source: MLL0827-06 Prepared&Analyzed: 12/27/02 <br /> Nitrate as NO3 1070 50 mg/l 1000 ND 107 87-113 1.89 8 <br /> Nitrite as NO2 519 50 500 ND 104 90-111 2.14 12 <br /> Sulfate as SO4 1120 50 1000 52 107 88-113 0.889 13 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance wilh the chain of <br /> 0 custody document. Unless otherwise stared,results are reported on a wet weight basis. <br /> This analytical report must he reproduced in its entirety. <br /> Page 15 of 18 <br />