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1455 McDowell Blvd,North Ste D <br /> a_ _� Sequoia Petaluma,CA 94954 <br /> " (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> w <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P412284 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/13/05 08 48 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result °/aREC 1}miis RPD Limit Notes <br /> Batch 5010120-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(5010120-MS1) Source P412479-10 Prepared&Analyzed 01/10/05 <br /> Tert-amyl methyl ether 243 50 ug/I 250 ND 97 78-117 <br /> Benzene 248 25 250 3 0 98 81-118 <br /> Tert-butyl alcohol 4050 1000 " 5000 ND 81 60-147 <br /> Di-isopropyl ether 249 50 " 250 ND 100 70-125 <br /> 1,2-Dibromoethane(EDB) 242 25 " 250 ND 97 85-125 <br /> 12-Dichloroethane 248 25 250 ND 99 77-126 <br /> Ethanol 1320 5000 5000 ND 26 55-200 LN <br /> Ethylbenzene 254 25 250 ND 102 89-122 <br /> Ethyl tert-butyl ether 246 50 250 ND 98 71-120 <br /> Methyl tert-butyl ether 1220 25 250 970 100 70-122 <br /> Toluene 244 25 250 4 3 96 84-119 <br /> Xylenes(total) 764 25 750 ND 102 86-132 <br /> eurrogale Drbromofluoromethane 525 500 105 84-122 <br /> Surrogate 12-Dichloroethane-d4 321 5 00 104 74-135 <br /> Surrogate Toluene-d8 5 18 5 00 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 504 5 00 101 86-119 <br /> Matrix Spike Dup(5010120-MSDI) Source P412479-10 Prepared&Analyzed 01/10/05 <br /> Tert-amyl methyl ether 239 50 ug/l 250 ND 96 78-117 2 20 <br /> Benzene 251 25 250 3 0 99 81-118 1 20 <br /> Teri-butyl alcohol 5300 1000 5000 ND 106 60-147 27 20 RB <br /> Di-isopropyl ether 251 50 250 ND 100 70-125 0 8 20 <br /> 1,2-Dibromoethane(EDB) 245 25 250 ND 98 85-125 1 20 <br /> 1,2 Dichloroethane 258 25 250 ND 103 77-126 4 20 <br /> Ethanol 2470 5000 5000 ND 49 55-200 61 20 LN <br /> Ethylbenzene 258 25 250 ND 103 89-122 2 20 <br /> Ethyl tert-butyl ether 245 50 250 ND 98 71-120 0 4 20 <br /> Methyl tert-butyl ether 1220 25 250 970 100 70-122 0 20 <br /> Toluene 250 25 250 4 3 98 84-119 2 20 <br /> Xylenes(total) 779 25 750 ND 104 86-132 2 20 <br /> Surrogate Dibrornofluoromethane 539 5 00 108 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 531 5 00 106 74-135 <br /> Surrogate Toluene-d8 523 500 105 84-119 <br /> Surrogate 4 Bromofluorobenzene 522 5 00 104 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 in its entirety <br /> Page 10 of I 1 <br />