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a <br /> - Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94454 <br /> r (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www'.sequoiahibs cora <br /> [JR5 Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Suite 300 PrcjeetNumber Intron-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/03 17 13 <br /> Volatile Organic Compounds by EPA Method 82601B <br /> Sequoia Analytical-Petaluma <br /> Reportaig <br /> Analyte Result 1,imit Units Dilution Batch Prepared Analy-d Method Notes <br /> b <br /> VW-4(P306252-04)Water Sampled:06/11/03 06 15 Received 06/12/0311 45 <br /> Tert-amyl methyl ether ND 1 0 ag/1 1 3060630 06/24/03 06/25/03 EPA 82608 <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 94% 84-122 <br /> Surrogate 1,2 lhchloroethane-d4 95% 74-135 <br /> Surrogate Toluene-d8 97% 84-119 ^ " <br /> VW-5(P306252-05)Water Sampled 06/11/03 04 25 Received 06/12/03 11-45 <br /> Tert-amyl methyl ether ND 10 ug/1 1 3060630 06/24/03 06/25/03 EPA 82608 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> ND 100 <br /> eyanol <br /> l tert-butyl ether ND 10 <br /> Methyl tent-butyl ether ND 050 " '• „ „ <br /> Surrogate Dibramofluoromethane 97% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 99% 74-135 ^ <br /> Surrogate Toluene-d8 93% 84-119 ^ <br /> VW-7(P306252-06)Water Sampled 06/11/03 1010 Received.06/12/0311 45 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3060397 06/17/03 06/17/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br /> „ <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether 0.54 050 <br /> Surrogate Dibromofluoromethane 99% 84-122 <br /> Surrogate 12-Dichloroethane-d4 100% 74-135 " <br /> Surrogate Toluene-d8 98% 84-119 ^ ^ <br /> i <br /> I <br /> I <br /> I <br /> �uOla 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 in its entirety <br /> Page 12 of 27 <br />