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885 Jarvis Drive <br /> (D Sequoia Morgan Hill CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs corn <br /> URS Corporation [Arco I I Project ARCO#5469, Stockton,CA MPC0315 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOBZP-0010 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/30/06 14 47 <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 6C14056-General Preparation/EPA 300 0 <br /> Blank(6C14056-BLKI) Prepared&Analyzed 03/07/06 <br /> Nitrate as NO3 ND 500 ug/l <br /> Sulfate as SO4 ND 500 " <br /> Laboratory Control Sample(6C14056-BS1) Prepared&Analyzed 03/07/06 <br /> Nitrate as NO3 9160 500 ugA 10000 92 80-115 <br /> Sulfate as SO4 9850 500 10000 98 90-t 10 <br /> Matrix Spike(6CI4056-MSI) Source MPC0317-01 Prepared&Analyzed 03/07/06 <br /> Nitrate as NO3 16600 500 ug/I 10000 6300 103 80-115 <br /> Sulfate as SO4 47400 5000 10000 43000 44 80-120 BB LN <br /> Matrix Spike Dup(6C14056-MSDI) Source MPC0317-01 Prepared&Analyzed 03/07/06 <br /> Nitrate as NO3 16700 500 ug/l 10000 6300 104 80-115 06 10 <br /> ito as SO4 48800 5000 " 10000 43000 58 80-120 3 20 BB LN <br /> �uoia Analytical-Morgan Hill 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 bases <br /> This analytical report must be reproduced in its entirety <br /> Page 27 of 29 <br />