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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> FAX Analytical wwsequ7ialabs 342 <br /> www sequrnalabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source °/.REC RPD <br /> Analyle Result Limit Units Level Result %REC Lunits RPD Limit Notes <br /> Batch 4090752-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(4090752-MSI) Source P409397-02 Prepared&Analyzed 09/30/04 <br /> Tert-amyl methyl ether 226 50 ug/E 250 ND 90 78-117 <br /> Benzene 257 2 5 250 043 101 81-118 <br /> Tert-butyl alcohol 430 100 500 ND 86 60-147 <br /> Di-isopropyl ether 254 50 250 ND 102 70-125 <br /> 1,2-Dichloroethane 50 0 25 25 0 21 116 77-126 <br /> Ethanol 297 500 500 ND 59 55-200 <br /> Ethytbenzene 255 25 25 0 ND 102 89-122 <br /> Ethyl tert-butyl ether 25 0 50 250 ND 100 71-120 <br /> Methyl tert-butyl ether 296 2 5 250 066 116 70-122 <br /> Toluene 24 2 2 5 250 ND 97 84-119 <br /> Xylenes(total) 74 3 2 5 75 0 ALD 99 86-132 <br /> ogate Drbromofluoromethane 6 14 500 113 84-122 LH <br /> % urrogate 1,2 Dichloroethane-d4 610 500 122 74-135 <br /> Surrogate Toluene-d8 519 5 00 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 558 5 00 112 86-119 <br /> Matrix Spike Dup(4090752-MSD1) Source P409397-02 Prepared&Analyzed 09/30/04 <br /> Tert-amyl methyl ether 226 50 ugll 250 ND 90 78-117 0 20 <br /> Benzene 250 2 5 250 043 98 81-118 3 20 <br /> Tert-butyl alcohol 564 100 500 ND 1]3 60-147 27 20 RB <br /> Di-isopropyl ether 249 50 25 0 ND 100 70-125 2 20 <br /> 1,2-Dichloroethane 50 3 2 5 250 2I 117 77-126 0 6 20 <br /> Ethanol 633 500 500 ND 127 55-200 72 20 R13 <br /> Ethylbenzene 24 7 2 5 25 0 ND 99 89-122 3 20 <br /> Ethyl tert-butyl ether 24 5 5 0 250 ND 98 71-120 2 20 <br /> Methyl tert-butyl ether 24 5 25 250 066 95 70-122 19 20 <br /> Toluene 23 4 25 25 0 ND 94 84-119 3 20 <br /> Xylenes(total) 72 3 2 5 75 0 ND 96 86-132 3 20 <br /> Surrogate Dibromofluoromethane 612 5 00 124 84-122 LH <br /> Surrogate 12 Dichloroethane-d4 598 500 120 74-135 <br /> Surrogate Toluene-d8 5 15 500 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 558 500 112 86-119 <br /> M <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight basis <br /> 77iis analytical report must be reproduced in its entirety <br /> Page 24 of 29 <br />