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a`` Sequoia 819 Striker Avenue,Suite 8 _ � Sacramento,CA 95834 AilahCal 921-9600 FAX(916)921-0100 www.sequoialabs.com Delta Environmental Consultants(Cameron Park) Project: Arco 6100,Tracy,CA 3330 Cameron Park Dr.Ste 550 Project Number. NIA Reported: Cameron Park CA,95682 Project Manager: ,lay Johnson 09/2I/01 15:50 Industrial Solvents by EPA Method 8015 (modified)-Quality Control Sequoia Analytical-Morgan Hill Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch 1I17012-EPA 3810 Headspace Blank(1117011-BLKI) Prepared&Anal zed:09/17/01 Methanol ND 1.0 mg/kg Surrogate:1 pentanol 6.95 5.00 139 31-166 Surrogate:I-pentanol(dbwax) 6.95 5.00 139 49-166 LCS 1117012-BS1 Prepared&Anal zed:09/17/01 Methanol 8.81 1.0 mg/kg 8.00 110 50-150 Surrogate:I-pentanol 6.76 5.00 135 31-166 Surrogate:1 pentanol(dbwax) 6.65 5.00 133 49-166 Matrix Spike(1I17012-MS1) Source:5109118-01 Prepared&Analyzed:09/17/01 Methanol 9.31 1.0 mg/kg 8.00 ND 116 50-150 Surrogate:I-pentanol 5.32 5.00 106 31-166 Surrogate:I-pentanol(dbwax) 5.3S 5.00 107 49-166 ,Matrix S ike Du 1I17012-MSDI Source:S109118-01 Prepared&Anal zed:09/17/01 Methanol 9.46 1.0 mg/kg 8.00 ND 118 50-150 1.60 50 Surrogate:1 pentanol 6.02 5.00 120 31-166 Surrogate:I-pentanol(dbwax) 6.06 5.00 121 49-166 Batch 1II8012-EPA 3810 Heads ace Blank(II18012-BLKI) Prepared&Analyzed:09/18/O1 Methanol ND 1.0 mg/kg Surrogate: 1 pentanol 5.86 5.00 117 31-166 Surrogate:I-pentanol(dbwax) 5.95 " 5.00 119 49-166 LCS(1118012-BS1) Prepared&Analyzed:09/18/01 Methanol 11.1 1.0 mg/kg 8.00 139 50-150 Surrogate: /pentanol 6.67 5.00 133 31-166 Surrogate:I-pentanol(dbwax) 6.53 5.00 131 49-166 Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain * , of custody document. This analytical report must be reproduced in its entirety. Page Page 19 of 24