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885 Jarvis Dr <br />Sequoia Mcrgan Hill, CA 95037 <br />Analytical (408) 776-9600 <br />FAX (408) 782-6308 <br />www. sequoialabs.can <br />URS Corporation [11 Project: ARCO #2093, Tracy, CA MLL0596 <br />2870 Gateway Oaks Dr., Ste 300 Project Number: ARCO #2093, Tracy, CA Reported: <br />Sacramento CA, 95833 Project Manager: Vern Elarth 12/20/02 11:42 <br />Total Metals by EPA 6000/7000 Series Methods - Quality Control <br />Sequoia Analytical - Sacramento <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 2120299 - EPA 3050B <br />Blank (2120299-BLK1) Prepared: 12/18/02 Analyzed: 12/20/02 <br />Lead ND 2.5 mg/kg <br />Laboratory Control Sample (2120299-BS1) Prepared: 12/18/02 Analyzed: 12/20/02 <br />Lead 47.0 2.5 mg/kg 50.0 94 80-120 <br />Matrix Spike (2120299-MS1) Source: S212380-01 Prepared: 12/18/02 Analyzed: 12/20/02 <br />Lead 210 10 mg/kg 50.0 150 120 80-120 QM -07 <br />Matrix Spike Dup (2120299-MSD1) Source: S212380-01 Prepared: 12/18/02 Analyzed: 12/20/02 <br />Lead 180 10 mg/kg 50.0 150 60 80-120 15 20 QM -07 <br />Sequoia Analytical - Morgan Hill <br />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 basis. <br />This analytical report must be reproduced in its entirety. <br />5 of 6 <br />