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Sequoia 1455 McDowell Blvd,North Ste <br /> Petaluma,CA 949544 <br /> (707)792-1865 <br /> a— ) <br /> ► Analytical FAX(707)792-0342 <br /> www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P305040 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/15/03 20 19 <br /> Volatile Organic Compounds by EPA Method 82601B- 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 3050175-EPA 5030 waters <br /> Blank 3050175-BLK2 Prepared 05/06/03 Analyzed 05/07/03 <br /> Tert-amyl methyl ether ND 1 0 ugfl <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Surrogate Debromofluoromethane 4 84 450 108 84-122 <br /> Surrogate 12-Dechloroethane-d4 4 81 450 107 74-135 <br /> Surrogate Toluene-d8 4 77 450 106 84-119 <br /> Laboratory Control Sample 3050175-BSl Prepared 05/06/03 Analyzed 05/07/03 <br /> Methyl tett-butyl ether 5 15 0 50 ug/l Soo 103 79-118 <br /> urrogale Dibromofluoromethane 5 07 " 450 113 84-122 <br /> Surrogate 1 2-Dechloroethane-d4 469 " 450 104 74-135 <br /> Surrogate Toluene-d8 4 94 " 450 110 84-119 <br /> Matrix Spike(3050175-MS1 Source-P304457-06 Prepared 05/_06/03 Analyzed 05/07/03 <br /> Methyl ter/-butyl ether 131 50 ug/1 50 0 95 72 79-118 Q-LIM <br /> Surrogate Dibromofluoromethane 536 " 450 119 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 91 450 109 74-135 <br /> Surrogate Toluene-d8 4 93 450 110 84-119 <br /> Matrix Spike Du 3050175-MSD1 Source P304457-06 Prepared 05/06/03 Analyzed 05/07/03 <br /> Methyl tert-butyl ether 149 5 0 ug/1 500 95 108 79-118 13 20 <br /> Surrogate Dibromofluoromethane 4 85 450 108 84-122 <br /> Surrogate 12-Dichloroethane-d4 485 450 108 74-135 <br /> Surrogate Toluene-d8 4 88 450 108 84-119 <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 10 of 12 <br />