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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921 9600 <br /> qWAnalytical FAX(916)921-0100 <br /> 3 www sequoialabs com <br /> Delta Environmental Consultants(Cameron Park) Project ARCO 2186,Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number 2186,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 12/27/01 15 45 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Walnut Creek <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW4 S712139-04 Water Sampled-12/11/01 09 27 Received 12/I1/01 12 00 <br /> tert-Butyl alcohol ND 1000 ug/l 50 1L20011 12/20/01 12/20/01 EPA 9260B <br /> Methyl tert-butyl ether(MTBE) 5600 100 " <br /> Di-isopropyl ether ND 100 " <br /> Ethyl tort-butyl ether ND 100 " <br /> tert-Amyl methyl ether ND 100 " <br /> Surrogate Dibromofluoromethane 99% 50-150 <br /> Surrozate I 1-Dichloroethane-d4 99% 50-150 <br /> MW51S112139-051 Water Sampled 12/11/01 06 06 Received 12/11/01 12 00 <br /> tert-Butyl alcohol ND 20 un,_Jl 1 1L20011 12/20/01 12/20/01 EPA 8260B <br /> Methyl tert-butyl ether(MTBE) ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromolluoromethane 98% 50-150 " <br /> Surrogate 12-Dichloroethane-d4 99% 50-150 <br /> MW6(S]12139-06)Water Sampled I2/I1/01 06 33 Received 12/11/01 12 00 <br /> tert-Butyl alcohol ND 20 ug/l 1 1 L20011 12/20/01 12/20/01 EPA 8260B <br /> Methyl tert-butyl ether(MTBE) ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrozate Dibromofluoromethane 101 % 50-150 " <br /> Surroizate 1 2-Dtchloroethane-d4 101 % 50-150 " <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 6 of 13 <br />