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819 Striker ,Suite 8 Sequoia Sacramento,Cnto,CA 95834 a— —) (916)921-9600 Analytical FAX(916)921-0100 www.sequoialabs.com Delta Environmental Consultants(Carneron Park) project: Arco 6100,Tracy,CA 3330 Cameron Park Dr.Ste 550 Project Number: NIA Reported: Cameron Park CA,95682 Project Manager: Jay Johnson 09/21/01 15:50 Industrial Solvents by EPA Method 8015 (modified) Sequoia Analytical-Morgan Hill Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes B33-20(S1091 18-01Soil Sam led:09/04/01 10-51 Received:09/07/01 1 :15 Methanol ND 1.0 mg/kg I H17012 09/17/01 09/17/01 EPA 8015M Surrogate:1-pentanol 110% 31-166 Surrogate:I-pentanol(dbwax) 111% 49-166 „ B33-48 S109118-02)Soil Sam le :09/04/01 11: 5 Received:0-9/0710115:15 Methanol ND 1.0 mg/kg l 1117012 09/17/01 09/17/01 EPA 8015M Surrogate:I-pentanol 115% 31-166 Surrogate:1-pentanol(dbwax) 117% 49-166 " B33-63 5109118-03 Soil Sampled:09/04/0112:05 Received:0910710115:15 Methanol ND 1.0 mg/kg 1 1117012 09/17/01 09/17/01 EPA 8015M Surrogate:I-pentanol 112% 31-166 Surrogate:I-pentanol(dbwax) 113% 49-166 833-95 S10 118-04 Soil Sam led:0 10410113:00 Received:09/07/011 :15 Methanol ND 1.0 mg/kg 1 1117012 09/17/01 09/17/01 EPA 8015M ' Surrogate:I-pentanol 110% 31-166 Surrogate:1-pentanol(dbwax) 112% 49-166 B33-104 S109118-05 Soil Sampled;09/04/01 j3:20 Received:09/07/01 15:1 Methanol ND 1,0 mg/kg 1 1117012 09/17/01 09/17/01 EPA 8015M Surrogate:I-pentanol 107% 31-166 Surrogate:1-pentanol(dbwax) 111% 49-166 " B33-1 10 S109118-06 Soil Sam le :09/041011 :30 Received:09/07/01 15:15 Methanol ND 1.0 mg/kg 1 1I17012 09/17/01 09/17/01 EPA 8015M Surrogate:I-pentanol II2% 31-166 „ r Surrogate:I-pentanol(dbwax) 115% 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 9 of 24