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819 Straker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> Analytical (916)921-9640 <br /> PAX(916)921-0100 <br />. www scquoialabs corn <br /> Delta Environmental Consultants(Cameron Park) Protect 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 /> MW11S112139-01)Water Sampled 12/I1/01 10 04 Recetved 12/11/01 12 00 <br /> tert-Butyl alcohol 1100 1000 ug/l 50 1L20011 12/20/01 12/21/01 EPA 8260B <br /> Methyl Cert-butyl ether(MTBE) 8800 100 <br /> Di-isopropyl ether ND 20 1 12/20/01 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether 72 20 " <br /> Surrogate Dtbromofluoromethane 98% 50-150 <br /> Surrogate I 1-Dachloroethane-d4 103 % 50-150 <br /> MW2(SI12139-02)Water Sampled 12/11/01 07 48 Received 12/11/01 12 00 <br /> tert-Butyl alcohol ND 20 ug/l I 1L20011 12/20/01 12/21/01 EPA 8260E <br /> Methyl tert-butyl ether(MTBE) 22 20 " <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 707% 50-150 <br /> Surro;eate 12-Dachloroethane-d4 110% 50-150 " <br /> MW3 Si12139-03 Water Sampled 12/11/01 08 22 Received 12/11/01 12 00 <br /> tert-Butyl alcohol ND 20 ug/l l 1 L20011 12/20/01 12/20/01 EPA 82608 <br /> Methyl tert-butyl ether(MTBE) ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tent-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dtbromofluoromethane 99% 50-150 <br /> Surrogate 1 2-Dachloroethane-d4 92% 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 5 of 13 <br />