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} <br /> r Sequoia 1455 McDowell �CA sag 4 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs mm <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intron-50293 Reported- <br /> Sacramento CA,95833 Project Manager• Vernon P Elatth 06/27/03 17 13 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> F <br /> al3te Result Lmut Units Dilution Batch Prepared Analyzed Method Notes <br /> MS-2A(P306252-13)Water Sampled-06/11/03 08:23 Received.06/12/0311:45 <br /> Tert-amyl methyl ether ND 10 ug/l 1 306066I 06/25/03 06/25/03 EPA 8260E <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate Dibromofluoromethane 91% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 90% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 <br /> MS-2B(P306252-14)Water Sampled.06/11/43 08 30 Received:06/12/03 1145 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3060661 06/25/03 06/25/03 EPA 82608 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> Wol ND 100 <br /> tert-butyl ether ND 10 ^ ^ ^ <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate Dibromofluoromethane 84% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 92% 74-135 " ^ <br /> Surrogate Toluene-d8 101°/a 84-119 <br /> MS-3A(P306252-15)Water Sampled 06111/03 08:45 Received:06/1210311:45 <br /> Tert-amyl methyl ether ND 10 ugll 1 3060661 06/25/03 06/25/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br /> i <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether 11 050 <br /> Surrogate Dibromofluoromethane 94% 84422 <br /> Surrogate 12-Dhchloroethane-d4 93% 74-135 ^ " <br /> Surrogate Toluene-d8 109% 84-119 <br /> W in tao Analytical-Petaluma The results in this report apply to the samples analyzed accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 27 <br />