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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (7)792-1842 <br />' FAX 0 792-4342 <br /> www.sequoialabs coni <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Swte 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/03 1713 <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 /> =Awly, Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3060383-EPA 5030 waters <br /> Blank(3060383-BLKI) Prepared&Analyzed 06/17/03 <br /> Gasoline Range Organics ND 50 ug/] <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 301 300 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 302 300 101 65-135 <br /> Laboratory Control Sample(3060383-BSI) Prepared&Analyzed 06/17/03 <br /> Gasoline Range Organics 2390 50 ug/l 2750 87 65-135 <br /> Benzene 393 050 335 117 65-135 <br /> Toluene 215 050 " 202 106 65-135 <br /> 6y1benzene 446 050 475 94 65-135 <br /> enes(total) 232 050 240 97 65-135 <br /> Surrogate a a a-Tnfluorotoluene 334 " 300 111 65-135 <br /> Surrogate 4-Bromofluorobenzene 317 300 106 65-135 <br /> M_atna Spike(3060383-MSI) - Source P306252-06 Prepared&Analyzed 0.6/17/03 <br /> Gasoline Range Organics - 2300 50 ug/t 2750 20 83 65-135 <br /> Benzene 388 050 335 0 13 115 65-135 <br /> Toluene 214 050 202 0 39 106 65-135 <br /> Ethylbenzene 452 050 475 ND 95 65-135 <br /> Xylenes(total) 233 050 " 240 ND 97 65-135 <br /> Surrogate a a a-Trifluorotoluene 339 300 113 65-135 <br /> Surrogate 4-BromoJluorobenzene 303 300 101 65-135 <br /> Matrix Spike Du (3060383-MSDI) Source P306252-06 PrePared&Analyzed 06/17/03 <br /> Gasoline Mange Organics 2310 50 ug/l 2750 20 83 65-135 04 20 <br /> Benzene 391 050 " 335 0 13 116 65-135 08 20 <br /> Toluene 218 050 202 039 108 65-135 2 20 <br /> Ethylbenzone 466 050 475 ND 98 65-135 3 20 <br /> Xylenes(total) 235 050 240 ND 98 65-135 09 20 <br /> Surrogate a a a-Trifluorotoluene 344 300 115 65-135 <br /> Surrogate 4 Bromofluorobenzene 313 " 300 104 65-135 <br /> O <br /> r <br /> ia 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 19 of 27 <br />