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1455 McDowell Blvd,North,Ste.D <br /> Sequoia Petaluma, -1865 <br /> 94954 <br /> 4D (707)79 792-1865 <br /> FAX(707)792-0342 <br /> N„- Analytical www.sequoialabs.com <br /> Cambria Environmental-Oakland Project: Equiva <br /> 1144 65th St.,Suite C Project Number: 341 E.Main Street,Ripon Reported: <br /> Oakland CA,94608 Project Manager: Darryk Ataide 10/11/00 16:59 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %R-EC RPD <br /> Analyte Result Limit Units level Result %REC Limits RPD Limit Notes <br /> Batch 0100227-EPA 5030 waters <br /> Matrix-Spike4(0100227-MSI) Source:-POI 0003-01Prepared-&-Analyzed:=10/09/00 <br /> Methyl tert-butyl ether 4.91 0.500 ug/l 5.00 ND 98.2 723-119 <br /> Surrogate:Dibromofluoromethane 5.58 5.00 112 88-118 <br /> Surrogate:1,2-Dichloroethane-d4 5.23 5.00 105 81-130 <br /> Surrogate:Toluene-d8 5.70 5.00 114 84-115 <br /> Matrix Spike Dup(0100227-MSD1) Source: P010003-01 Prepared&Analyzed: 10/09/00 _ <br /> Methyl tert-butyl ether 4.75 0.500 ug/l 5.00 ND 95.0 72.7-119 3.31 20 <br /> Surrogate:Dibromofluoromethane 5.39 5.00 108 88-118 <br /> Surrogate:l,2-Dichloroethane-d4 5.05 5.00 101 81-130 <br /> Surrogate:Toluene-d8 5.73 5.00 115 84-115 <br /> i <br /> I <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> •custody document. This analytical report must be reproduced in its entirety. <br /> Page 8 of 9 <br />