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i <br /> /.7 Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (70-0'92-1845 <br /> (707)792-0342 <br /> www segwmlabs coin <br /> ti <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive State 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/03 17 13 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> �Analyte Result Lamm units Level Result %REC Limits RPD Limit Notes <br /> Batch 3060544-EPA 5030,waters <br /> Blank(3060544-BLKl) Prepared&Analyzed 06/23/03 <br /> Gasoline Range Qrgamcs ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbcnzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trtfluorotoluene 301 300 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 307 300 102 65-135 <br /> LaboratM Control Sample(3060544-BSI) Prepared&Analyzed 06/23/03 <br /> Gasoline Range Orgamcs 2220 50 ug/l 2750 81 65-135 <br /> Benzene 374 050 335 112 65-135 <br /> Toluene 203 050 202 100 65-135 <br /> Mbenzene 427 050 475 90 65-135 <br /> cs(tom) 224 050 240 93 65-135 <br /> Surrogate a a a-Triluorotoluene 334 300 111 65-135 <br /> Surrogate 4-Bromofluorobenzene 318 300 106 65-135 <br /> Matrix Spike(3060544-MS1) Source P306252-01 Prepared&Analyzed 06/23/03 <br /> Gasohne Range Organics 2240 50 ugA 2750 26 81 65-135 <br /> Benzene 368 050 335 026 109 65-135 <br /> Toluene 206 050 " 202 ND 102 65-135 <br /> Ethylbenzene 424 050 475 018 89 65-135 <br /> Xylenes(total) 222 050 240 ND 92 65-135 <br /> Surrogate a aa-Trtfluorotoluene 333 " 300 111 65-135 <br /> Surrogate 4-Bromofluorobenzene 315 " 300 105 65-135 <br /> Matrrx Spike Du (3060544-MSDI) Source P306252-01 Prepared&Analyzed 06/23/03 <br /> Gasoline Range Orgamcs 2250 50 ug/1 2750 26 81 65-135 04 20 <br /> Benzene 372 050 335 026 110 65-135 1 20 <br /> Toluene 210 050 202 ND 104 65-135 2 20 <br /> Ethylbenzene 439 050 475 019 92 65-135 3 20 <br /> xylenes(tom) 227 050 240 ND 95 65-135 2 20 <br /> Surrogate a a a-Tnfluorotoluene 333 300 111 65-135 <br /> Surrogate 4 Bromofluorobenzene 312 300 104 65-135 <br /> iota Analytical-Petaluma The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document. Unless otherwise staters results are reported on a wet weight basis <br /> Thts analytical report must be reproduced in its entirety <br /> Page 20 of 27 <br />