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l B[vd North Ste <br /> Sequoia 1455 McDvwPetaalutna CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(107)792-0342 <br /> WWW sequotalabs com <br /> Ib <br /> URS Com-Sacramento Project Arco Site 6100,Tracy,CA P402493 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/17/04 15 30 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RAD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 4030433-EPA 5030 soils <br /> Blank(4030433-BLKI) Prepared&Analyzed 03/16/04 <br /> Tert-amyl methyl ether ND 00050 mg/kg <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 0 10 " <br /> Di-isopropyl ether ND 0 0050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 1 2-Dtchloroethane ND 00050 " <br /> Ethanol ND 0 20 " <br /> Ethylbenzene ND 00050 " <br /> Ethyl Cert-butyl ether ND 00050 <br /> Methyl tert-butyl ether ND 00050 " <br /> Toluene ND 00050 " <br /> lenes(total) ND 0 0050 <br /> JW ogate Dibromofluoromethane 00470 00450 104 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 00453 00450 101 73-131 <br /> Surrogate Toluene-d8 00508 00450 113 82-129 <br /> Laboratory Control Sample(4030433-BSI) Prepared&Analyzed 03/16/04 <br /> Tert-amyl methyl ether 0 0520 0 0050 mg/kg 0 0500 104 74-126 ^ <br /> Benzene 0 0513 0 0050 00500 103 75-123 <br /> Tert-butyl alcohol 0 958 0 10 1 00 96 66-129 <br /> Di-isopropyl ether 00486 0 0050 00500 97 71-127 <br /> 1 2-Dibromoethane(EDB) 00533 00050 00500 107 88-118 <br /> 1,2-Dtchloroethane 00495 00050 00500 99 79-119 <br /> Ethanol 0 933 0 20 1 00 93 70-140 <br /> Ethylbenzene 0 0546 00050 0 0500 109 65-135 <br /> Ethyl tert-butyl ether 0 0505 0 0050 0 0500 101 72-123 <br /> Methyl tert-butyl ether 0 0500 0 0050 0 0500 100 70-125 <br /> Toluene 0 0529 0 0050 00500 106 76-123 <br /> Surrogate Dibromofluoromethane 00473 00450 105 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 00455 00450 101 73-131 <br /> Surrogate Toluene-d8 00509 00450 113 82-129 <br /> oia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced to its entirety <br /> Page 23 of 25 <br />