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ri <br /> ` lvd North Ste D <br /> Sequoia 1455 McDowell Pealuma CA 949544 <br /> (707)792-1865 <br /> q ► Analytical FAX(707)792-0342 <br /> www seguoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,'Tracy,CA P402493 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/17/04 15 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 4030069-EPA 5030B soils McOH <br /> Laboratory Control Sample(4030069-BS1) Prepared&Analyzed 03/02/04 <br /> Tert-amyl methyl ether 0 0118 0 010 mg/kg 00100 118 74-126 <br /> Benzene 00117 0 010 00100 117 75-123 <br /> Tert-butyl alcohol 0 233 020 0200 116 66-129 <br /> Di-isopropyl ether 00118 0 010 00100 118 71-127 <br /> 1,2-Dibromoethane(EDB) 00123 0 010 0 0100 123 88-118 zQLIM <br /> 1,2-Dichloroethane 00119 0 010 0 0100 119 79-119 <br /> Ethanol 0261 040 0200 130 70-140 <br /> Ethylbenzene 00123 0 010 00100 123 65-135 <br /> Ethyl Cert-butyl ether 00116 0 010 00100 116 72-123 <br /> Methyl tert-butyl ether 00116 0 010 00100 116 70-125 <br /> Toluene 0 0113 0 010 00100 113 76-123 <br /> !ogate DibromoJluoromethane 000896 000900 100 81-126 <br /> ogate 1 2-Drchloroethane-d4 000869 000900 97 73-131 <br /> Surrogate Toluene-d8 000933 000900 104 82-129 <br /> Laboratory Control Sample Dup(4030069-BSDI) Prepared 03/02/04 Analyzed 03/03/04 <br /> Tert-amyl methyl ether 00117 0 010 mg/kg 00100 117 74-126 0 9 35 <br /> Benzene 0 0118 0 010 00100 118 75-123 0 9 35 <br /> Tert-butyl alcohol 0 269 020 0200 134 66-129 14 35 zQLIM <br /> Di-isopropyl ether 00116 0 010 00100 116 71-127 2 35 <br /> 1 2-Dibromoethane(EDB) 0 0123 0 010 00100 123 88-118 0 35 zQLIM <br /> 1,2-Dtchloroethane 0 0121 0 010 00100 121 79-119 2 35 zQLIM <br /> Ethanol 0 353 0 40 0200 176 70-140 30 35 zQLIM <br /> Ethylbenzene 00122 0 010 0 0100 122 65-135 0 8 35 <br /> Ethyl tert-butyl ether 0 0115 0 010 0 0100 115 72-123 0 9 35 <br /> Methyl tert-butyl ether 0 0116 0 010 0 0100 116 70-125 0 35 <br /> Toluene 00115 0 010 00100 115 76-123 2 35 <br /> Surrogate DibromoJluoromethane 000894 000900 99 81-126 <br /> Surrogate 12-Drchloroethane-d4 000891 000900 99 73-131 <br /> Surrogate Toluene-d8 000926 000900 103 82-129 <br /> i <br /> oia 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 22 of 25 <br />