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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma,CA 94954 <br /> 4D (707)792-1865 <br /> FAX Analytical www <br /> labsco2 <br /> www segaoiatabs coin <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P306136 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/16/03 08 50 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B18021B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %RFC Luruts RPD Lunit Notes <br /> Batch 3060347-EPA 5030,waters <br /> Blank(3060347-BLKI) Prepared&Analyzed 06/16/03 <br /> Gasoline Range Organics ND 50 ugll <br /> Benzene ND 050 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trfluorotoluene 309 300 103 65-135 <br /> Surrogate 4-Bromofluorobenzene 285 300 95 65-135 <br /> Laboratory Control Sample(3060347-BSI) Prepared&Analyzed 06/76/03 <br /> Gasoline Range Organics 2480 50 ug/1 2750 90 65-135 <br /> Benzene 307 050 335 92 65-135 <br /> Toluene 211 050 202 104 65-135 <br /> •Etliylbcnzene 477 050 „ 475 100 65-135 <br /> Xylenes(total) 227 050 240 95 65-I35 <br /> Surrogate a a a-Trfluorotoluene 348 300 116 65-135 <br /> Surrogate 4-Bromofluorobenzene 308 300 103 65-135 <br /> Matrix Spike(3060347-MSI) j Source P306135-01 Prepared&Analyzed 06/16/03 <br /> Gasoline Range Organics t'/� 3430 50 ug/1 2750 950 90 65-135 <br /> Benzene ,tlJi" 140 050 33 5 130 30 65-135 QM-4X <br /> Toluene L�L� 159 050 202 5 1 76 65-135 <br /> Ethylbenzene 467 050 47 5 8 6 80 65-135 <br /> Xylenes(total) 186 050 240 88 74 65-135 <br /> Surrogate a a a-Trfluorotoluene 267 300 89 65-135 <br /> Surrogate 4-Bromofluorobenzene 318 300 106 65-135 <br /> Matrix Spike Dup(3060347-MSD1) Source P306135-01 Prepared&Analyzed 06/16/03 <br /> Gasoline Range Organics 3430 50 ug/l 2750 950 90 65-135 0 20 <br /> Benzene 149 050 335 130 57 65-135 6 20 QM-4X <br /> Toluene 187 050 202 5 1 90 65-135 16 20 <br /> Ethylbenzene 44 2 050 475 86 85 65-135 5 20 <br /> Xylenes(total) 205 050 240 88 82 65-135 10 20 <br /> Surrogate a a a-Tr fluorotoluene 308 300 103 65-135 <br /> Surrogate 4-Bromofluorobenzene 321 300 107 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 1 I of 15 <br />