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1 <br /> a— ) <br /> 1455 McDowl Blvd North Ste D <br /> Sequoia Petaluma.CA 94954 <br /> 11 (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs com <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 EIarth 01/13/05 08 48 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia AnalyticaI _ Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4120505-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(4120505-MSI) Source P412245-09 Prepared&Analyzed 12/27/04 <br /> Tert-amyl methyl ether 468 so u9,9 250 ND 187 78-117 LM <br /> Benzene 428 25 250 2 7 160 81-118 LM <br /> Tert-butyl alcohol 776 100 500 ND 155 60-147 LM <br /> Di-isopropyl ether 433 50 250 ND 173 70-125 LM <br /> 1,2-Dichtoroethane 432 25 250 ND 173 77-126 LM <br /> Ethanol 1130 500 500 ND 226 55-200 LM <br /> Ethylbenzene 643 25 25 0 21 173 89-122 LM <br /> Ethyl tent-butyl ether 44 8 50 25 0 ND 179 71-120 LM <br /> Methyl tert-butyl ether 52 8 2 5 25 0 9 7 172 70-122 LM <br /> Toluene 432 25 25 0 ND 173 84-119 LM <br /> Xylenes(total) 142 2 5 75 0 11 175 86-132 LM <br /> Surrogate Dibromofluoromethane 301 5 00 100 84-122 <br /> urrogate 12-Dichloroethane-d4 4 88 ,I Soo 98 74-135 <br /> Surrogate Toluene-d8 545 500 109 84-119 <br /> Surrogate 4-Bromofluorobenzene 518 500 104 86-119 <br /> Matrix Spike Dup(4120505-MSD1) Source P412245-09 Prepared&Analyzed 12/27/04 <br /> Tert-amyl methyl ether 460 5 0 ug/I 250 AID 184 78-117 2 20 LM <br /> Benzene 405 25 250 2 7 151 81-118 6 20 LM <br /> Tert-butyl alcohol 745 100 500 ND 149 60-147 4 20 LM <br /> Di-isopropyl ether 41 8 5 0 250 ND 167 70-125 4 20 LM <br /> 12-Dichloroethane 41 8 25 250 ND 167 77-126 3 20 LM <br /> Ethanol 1150 500 500 ND 230 55-200 2 20 LM <br /> Ethylbenzene 606 2 5 250 2I 158 89-122 6 20 LM <br /> Ethyl tert-butyl ether 44 1 50 250 ND 176 71-120 2 20 LM <br /> Methyl tett-butyl ether 51 9 25 250 97 169 70-122 2 20 LM <br /> Toluene 406 25 25 0 ND 162 84-119 6 20 LM <br /> Xylenes(total) 135 2 5 750 11 165 86-132 5 20 LM <br /> Surrogate Dibromofluoromethane 506 5 00 101 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 4 86 5 00 97 74-135 <br /> Surrogate Toluene d8 5 41 500 108 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 16 500 103 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 in its entirety <br /> Page 8 of l l <br />