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• 18 19 Striker Avenue,Suite 8 Sequoia Sacramento,CA 95834 Y7 a (916) 921-9600 Analytical W. equo 921-0 100 vrww.sequolalabs.com i Delta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA 3330 Cameron Park Dr. Ste 550 Project Number. N/A Reported: Cameron Park CA,95682 Project Manager: Jay Johnson 07/03/01 10:27 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analyte Result Limit Units Dilution Hatch Prepared Analyzed Method Notes MW1-26' (S106300-01)Water Sampled: 06/19/0108:25 Received:06/19/01 10:47 1,2-Dichloroethane 4.6 2.0 ug/l 1 1060101 06/23/01 06/23/01 EPA 8260B Di-isopropyl ether ND 10 „ Ethyl tert-butyl ether ND 2.0 Methyl tert-butyl ether 8,8 2.0 „ Tert-amyl methyl ether ND 2.0 " Tert-butyl alcohol ND 100 " Surrogate: 1,2-Dichloroethane-d4 100% 76-114 Surrogate: Toluene-d8 102% 88-110 MW2-25'(5106300-02)Water Sampled: 06/19/0107:54 Received: 06/19/01 10:47 1,2-Dichloroethane 3.6 2.0 ug/1 1 1060101 06/23/01 06/23/01 EPA 8260B Di-isopropyl ether ND 2.0 Ethyl tert-butyl ether ND 2.0 thyl tert-butyl ether ND 2.0 amyl methyl ether ND 2.0 -butyl alcohol ND 100 " Surrogate: 1,2-Dichloroethane-d4 99.8% 76-114 Surrogate: Toluene-d8 101 % 88-110 „ MW3-25' (5106300-03)Water Sampled:06/19/0107:20 Received:06/19/01 10:47 1,2-Dichloroethane ND 2.0 ug/1 1 1060101 06/23/01 06/23/01 EPA 8260B Di-isopropyl ether ND 2.0 Ethyl tert-butyl ether ND 2.0 „ Methyl tert-butyl ether ND 2.0 „ Tert-amyl methyl ether ND 2.0 Tert-butyl alcohol ND 100 .. „ Surrogate: 1,2-Dichloruelhane-d4 102% 76-114 — --� - Surrogate: Toluene-d8 98.0% 88-110 oia Analytical-Sacramento The results in this report apply 10 the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Page 4 of 10