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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,)9 99600 <br /> Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> Iw www sequoialabs corn <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 /> Rcporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW7(5112139-07)Water Sampled 12/11/01 0656 Received 12/11/01 12 00 <br /> tert-Butyl alcohol ND 20 ugA 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 Dibromol2uoromethane 102016 50-150 " <br /> Surrogate 12-Dechloroethane-d4 104% 50-150 " <br /> VW1B(S112139-08)Water Sampled 12/11/01 10 14 Received 12/11/01 12 00 <br /> tert-Butyl alcohol 170 20 ug/l l 1 L20011 12/20/01 12/20/01 EPA 8260B <br /> Methyl tert-butyl ether(MTBE) 1700 100 50 12/21/01 <br /> Di-isopropyl ether ND 20 1 12/20/01 <br /> Ethyl tert-butyl ether 24 20 " <br /> tert-Amyl methyl ether 12 20 <br /> Surrogate Dibromolluoromethane 106% 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 109% 50-150 <br /> VW213(S112139-09)Water Sampled 12/11/01 08 39 Received 12/11/01 12 00 <br /> tert-Butyl alcohol 34 20 ugA 1 1 L20011 12/20/01 12/20/03 EPA 8260E <br /> Methyl tert-butyl ether(MTBE) 450 20 10 12/21/01 " <br /> Di-isopropyl ether ND 20 1 12/20/01 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Cert-Amyl metbyl ether 25 20 " <br /> Surrogate Dibromofluoromethane 101% 50-150 " <br /> Surrogate 12-Dechloroethane-d4 105% 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 7 of 13 <br />