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w <br /> �a—' <br /> 'a 1455 McDowell Blvd,North Ste D <br /> (707)792-1865 <br /> Sequoia Petaluma CA 94954 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs cum <br /> URS Com-Sacramento Project Arco Site 760,Lodi,CA P310474 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/04/03 11 41 <br /> Volatile Organic Compounds by EPA Method 8260B- Quahty 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 3100786-EPA 5030 waters <br /> Matrix Spike(3100786-MS1) Source P310487-03 Pared&Analyzed I0/30/03 <br /> Tert-amyl methyl ether 495 10 ugA 500 ND 99 70-116 <br /> Benzene 5 11 0 50 5 00 ND 102 81-118 <br /> Tert-butyl alcohol 108 20 100 ND 108 62-142 <br /> Di-isopropyl ether 5 12 1 0 5 00 ND 102 71-121 <br /> 1,2-Dibromoethane(EDB) 494 0 50 " 5 00 ND 99 92-117 <br /> 1,2-Dichloroethane 5 59 050 " 5 00 ND 112 79-I26 <br /> Ethanol 89 9 100 " 100 ND 90 65-135 <br /> Ethylbenzene 5 59 050 5 00 ND 112 89-122 <br /> Ethyl tert-butyl ether 504 1 0 5 00 ND 101 71-110 <br /> Methyl tert-butyl ether 471 050 5 00 ND 94 77-123 <br /> Toluene 476 050 5 00 ND 95 84-119 <br /> AdWkXylenes(total) 160 050 15 0 ND 107 86-132 <br /> urrogate Dibromofluoromethane 737 6 00 123 84-122 S-LIM <br /> Surrogate 1 2-13ichloroethane-d4 646 600 108 74-135 <br /> Surrogate Toluene-d8 610 600 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 6 15 oo 600 101 86-119 <br /> Matnx Spike Dup(3100786-MSD1) Source P310487-03 Prepared&Analyzed 10130.1.03 <br /> Tert-amyl methyl ether 498 1 0 ug/1 500 ND ]00 70-116 0 6 20 <br /> Benzene 5 12 0 50 500 ND 102 81-118 0 2 20 <br /> Tert-butyl alcohol 111 20 100 ND ]1 1 62-142 3 20 <br /> Di-isopropyl ether 5 15 1 0 500 ND 103 71-121 0 6 20 <br /> 1,2-Dibromoethane(EDB) 5 11 0 50 Soo ND 102 92-117 3 20 <br /> 1,2-Dichloroethane 5 70 050 500 ND 114 79-126 2 20 <br /> Ethanol 124 100 100 ND 124 65-135 32 20 QR-02 <br /> Etbylbenzene 5 59 050 5 00 ND 112 89-122 0 20 <br /> Ethyl tert-butyl ether 5 12 1 0 5 00 ND 102 71-110 2 20 <br /> Methyl tert-butyl ether 474 0 50 500 ND 95 77-123 0 6 20 <br /> Toluene 476 0 50 5 00 ND 95 84-119 0 20 <br /> Xylenes(total) 160 0 50 " 150 ND 107 86-132 0 20 <br /> Surrogate Dibromofluoromethane 722 600 120 84-122 <br /> Surrogate 12-Dichloroethane-d4 6 76 600 113 74-135 <br /> Surrogate Toluene-d8 625 600 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 630 " 600 105 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> . of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 11 <br />