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1455 McDowell Blvd North Ste D <br /> •1 <br /> Sequoia Petaluma,C 94954 <br /> (707)799 2 1865 <br /> FAX(707)792-0342ro <br /> Analytical <br /> www sequoialalabstom <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P410096 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/20/04 17 30 <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 °/"REC Limits RPD Limit Notes <br /> Batch 4100304-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(4100304-MSI) Source P410091-02 Prepared&Analyzed 10/13/04 <br /> Tert-amyl methyl ether 268 50 ug/l 250 ND 107 78-117 <br /> Benzene 261 25 250 ND 104 81-118 <br /> Ten-butyl alcohol 4230 1000 5000 200 81 60-147 <br /> Di-isopropyl ether 255 50 250 ND 102 70-125 <br /> 1,2-Dibroinoethane(EDB) 251 25 250 ND 100 85-125 <br /> 1,2-Dichloroethane 244 25 250 ND 98 77-126 <br /> Ethanal 5140 5000 5000 ND 103 55-200 <br /> Ethylbenzene 247 25 250 ND 99 89-122 <br /> Ethyl tert-butyl ether 262 50 250 ND 105 71-120 <br /> Methyl tert butyl ether 1780 25 250 1500 112 70-122 <br /> Toluene 252 25 250 ND 101 84-119 <br /> AdWylenes(total) 764 25 750 ND 102 86-132 <br /> rrogate Dibromofluoromethane 531 500 110 84-121 <br /> Surrogate 1,2-Dichloroethane-d4 537 300 107 74-135 <br /> Surrogate Toluene-d8 588 500 118 84-119 <br /> Surrogate 4-Bromofluorobenzene 517 500 103 86-119 <br /> Matrix Spike Dup(4100304-MSD1) Source P410091-02 Prepared&Analyzed 10/13/04 <br /> Tert-amyl methyl ether 272 50 ugll 250 ND 109 78-117 1 20 <br /> Benzene 255 25 250 ND 102 81-118 2 20 <br /> Tert butyl alcohol 4180 1000 5000 200 80 60-147 1 20 <br /> Di-isopropyl ether 252 50 250 ND 101 70-125 1 20 <br /> 1 2-Dibromoethane(EDB) 249 25 250 ND 100 85-125 0 8 20 <br /> 12-Dichloroethane 248 25 250 ND 99 77-126 2 20 <br /> Ethanol 5640 5000 5000 ND 113 55-200 9 20 <br /> Ethylbenzene 241 25 250 ND 96 89-122 2 20 <br /> Ethyl tert-butyl ether 264 50 250 ND 106 71-120 0 8 20 <br /> Methyl tert-butyl ether 1790 25 250 1500 116 70-122 0 6 20 <br /> Toluene 245 25 250 ND 98 84-119 3 20 <br /> Xylenes(total) 735 25 750 ND 98 86-132 4 20 <br /> Surrogate Dibromofluoromethane 5 55 500 111 84-122 <br /> Surrogate 12-Dichloroethane-d4 5 45 500 109 74-135 <br /> Surrogate Toluene-d8 5 94 500 119 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 13 500 105 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 staled results are reported on a wet weight basis <br /> nis analytical report must be reproduced in its entirety <br /> Page 8 of 11 <br />