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1455 McDowell Blvd. North,Ste. D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> 1:1) Analytical FAXquoial bs-corn www.sequoialabs.com <br /> Cambria Environmental-Emeryville Project: Equiva <br /> 6262 Hollis Street Project Number: 341 East Main St,Ripon Ca Reported: <br /> Emeryville CA,94608 Project Manager: Owen Ratchye 04/23/01`14:27 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015NV8020M - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Nates <br />—Batch.1040308_EPA.5030,waters <br /> Blank(1040308-BLKI) Prepared&Analyzed: 04/13/01 <br /> Gasoline ND 50.0 ug/1 <br /> Benzene ND 0.500 " <br /> Toluene ND 0.500 " <br /> Ethylbenzene ND 0.500 " <br /> Xylenes(total) ND 0.500 " <br /> Surrogate:a,a,a-Trifluorotoluene 334 300 111 65-135 <br /> Surrogate:4-Bromofluorobenzene 297 300 99.0 65-135 <br /> GCS(1040308-BS1) Prepared&Analyzed: 04/13/01 <br /> Gasoline 2820 50.0 ug/l 2750 103 65-135 <br /> Benzene 33.5 0.500 32.0 105 65-135 <br /> Toluene 221 0.500 193 115 65-135 <br /> Ethylbenzene 52.7 0.500 46.0 115 65-135 <br /> Xylenes(total) 266 0.500 231 115 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 368 " 300 123 65-135 <br /> Surrogate.4-Bromofluorobenzene 316 " 300 105 65-135 <br /> Matrix Spike(1040308-MS1) Source:P104262-03 Prepared&Analyzed: 04/13/01 <br /> Gasoline 2800 50.0 ug/l 2750 ND 102 65-135 <br /> Benzene 43.3 0.500 32.0 ND 135 65-135 <br /> Toluene 225 0.500 193 ND 117 65-135 <br /> Ethylbenzene 54.1 0.500 46.0 ND 118 65-135 <br /> Xylenes(total) 270 0.500 231 ND 117 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 370 300 123 65-135 <br /> Surrogate:4-Bromofluorobenzene 305 300 102 65-13S <br /> Matrix Spike Dup(1040308-MSDI) Source: P104262-03 Prepared&Analyzed: 04/13/01 <br /> Gasoline 2830 50.0 ug/l 2750 ND 103 65-135 1.07 20 <br /> Benzene 42.0 0.500 32.0 ND 131 65-135 3.05 20 <br /> Toluene 220 0.500 193 ND 114 65-135 2.25 20 <br /> Ethylbenzene 53.6 0.500 46.0 ND 117 65-135 0.929 20 <br /> Xylenes(total) 267 0:500 231 ND 116 65-135 1.12 20 <br /> Surrogate:a,a,a-Trifluorotoluene 359 300 120 65-135 <br /> Surrogate. 4-Bromofluorobenzene 313 300 104 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document. This analytical report must be reproduced in its entirely. <br /> Page 4 of 6 <br />