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885 Jarvis Drive <br /> a- <br /> Sequoia MorganHiHiII,CA95037 <br /> Analytical (408)776-9600 <br /> FAX equo labs.c 08 <br /> www.sequoialabs.com <br /> URS Corporation rArcoII Project:ARCO#0595,CA MPA0141 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project ManagerNernon P.Elarth 01/18/06 17:37 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6A12013-EPA 5035/EPA 8260B <br /> Laboratory Control Sample(6A12013-BS2) Prepared&Analyzed:01/12/06 <br /> Gasoline Range Organics(C4-C 12) 0.638 0.10 mg/kg 0.550 116 53-126 <br /> Surrogate:l,2-Dichloroethane-d4 0.00322 0.00500 64 60-125 <br /> Laboratory Control Sample Dup(6AI2013-BSD1) Prepared&Analyzed:01/12/06 <br /> tert-Amyl methyl ether 0.0152 0.0050 mg/kg 0.0163 93 80-130 1 25 <br /> Benzene 0.00514 0.0050 0.00504 102 65-125 0.2 20 <br /> tert-Butyl alcohol 0.134 0.020 0.169 79 80-165 1 25 HM <br /> Di-isopropyl ether 0.0175 0.0050 0.0162 108 85-115 1 20 <br /> 1,2-Dibromoethane(EDB) 0.0163 0.0050 0.0166 98 85-130 3 15 <br /> 1,2-Dichloroethane 0.0119 0.0050 0.0187 64 63-124 4 25 <br /> Ethanol 0.220 0.10 0.165 133 35-150 2 40 <br /> Ethyl tert-butyl ether 0.0172 0.0050 0.0164 105 80-125 2 25 <br /> Ethylbenzene 0.00756 0.0050 0.00728 104 80-135 0.8 20 <br /> Methyl tert-butyl ether 0.00690 0.0050 0.00784 88 75-115 2 35 <br /> Toluene 0.0392 0.0050 0.0380 103 85-125 3 15 <br /> Xylenes(total) 0.0398 0.0050 0.0408 98 80-140 2 20 <br /> Surrogate:1,2-Dichloroethane-d4 0.00328 0.00500 66 60-125 <br /> Laboratory Control Sample Dup(6A12013-BSD2) Prepared&Analyzed:01/12/06 <br /> Gasoline Range Organics(C4-C 12) 0.654 0.10 mg/kg 0.550 119 53-126 2 25 <br /> Surrogate:1,2-Dichloroethane-d4 0.00329 0.00500 66 60-125 <br /> Batch 6A12019-EPA 503013/5035A McOH/EPA 8260B <br /> Blank(6A12019-BLKI) Prepared&Analyzed:01/12/06 <br /> tert-Amyl methyl ether ND 0.025 mg/kg PF <br /> Benzene ND 0.050 <br /> tert-Butyl alcohol ND 5.0 PE <br /> Di-isopropyl ether ND 0.025 PF <br /> 1,2-Dibromoethane(EDB) ND 0.025 " <br /> 1,2-Dichloroethane ND 0.025 " <br /> Ethanol ND 10 IC <br /> Ethyl tert-butyl ether ND 0.025 " <br /> Ethylbenzene ND 0.050 " <br /> ` Methyl tert-butyl ether ND 0.025 PF <br /> Toluene ND 0.050 " <br /> Xylenes(total) ND 0.050 " <br /> Sequoia Analytical-Morgan Hill 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 9 of 11 <br />