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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 1865 <br /> Analytical <br /> 41) (707)792- <br /> FAX(707)792 0342342 <br /> i <br /> www sequoudabs corn <br /> [JR4 Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento(A,95833 Project Manager Vernon P EIarth 01/18/05 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-7(P412423-07)Water Sampled 12/20/04 12 00 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 10 ug/l 1 5010012 01/03/05 01/03/05 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isoprop3I ether ND 10 <br /> 1,2-Dichloroethane ND 050 <br /> rthanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-but}I ether ND 10 11 " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibrnmofluoromethane 98% 84-122 " <br /> Surrogate 12-Drchloroethane-d4 98% 74-135 " <br /> Surrogate toluene-d8 105% 84-119 " <br /> 0urrogate 4-Bromofluorobenzene 105% 86-119 " <br /> VW-1 (P412423-08)Water Sampled 12/20/04 12 50 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 1 0 ugll 1 5010012 01/03/05 01/03105 EPA 8260B <br /> Benzene 094 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 <br /> 1,2-Drchloroethane 2 3 050 " <br /> Ethanol ND 100 " <br /> Fthylbenrene 76 050 E <br /> Ethyl tert-but}I ether ND 1 0 " <br /> Methyl tert-butyl ether 13 050 " <br /> Toluene ND 050 ^ " <br /> Xylenes(total) 140 0 50 ^ ^ <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogalc 12-Drchloroethane-d4 95% 74-135 " <br /> Surrogate Toluene-d8 113% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in 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 to its entirety <br /> Page 9 of 33 <br />