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1455 McDowell Blvd,Horth Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707) 42 <br /> WWW sequoca/alas[abs c coin <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P306156 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36588 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/25/03 17 01 <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 Limit Units Level Result %REC Limits RPD Lunt Notes <br /> Batch 3060383 -EPA 5030,waters <br /> Blank(3060383-BLK1) Prepared&Analyzed 06/17/03 <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-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/I 2750 87 65-135 <br /> Benzene 393 050 335 117 65-135 <br /> Toluene 215 050 202 106 65-135 <br /> Wthylbenzene 446 050 475 94 65-135 <br /> ylenes(total) 232 050 240 97 65-135 <br /> Surrogate a a a-Trifluoratoluene 334 300 111 65-135 <br /> Surrogate 4-Bromofluorobenzene 317 300 106 65-135 <br /> Matrix Spike(3060383-MS1) Source P306252-06 Prepared&Analyzed 06/17/03 <br /> Gasoline Range Organics 2300 50 ug/I 2750 20 83 65-135 <br /> Benzene 398 050 33 5 013 115 65-135 <br /> Toluene 214 050 202 039 106 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-Trtfluorotoluene 339 300 113 65-135 <br /> Surrogate 4-Bromofluorobenzene 303 300 101 65-135 <br /> Matrix Spike Dup(3060383-MSD1) Source P306252-06 Prepared&Analyzed 06/17/03 <br /> Gasoline Range Organics 2310 50 ug/I 2750 20 83 65-135 04 20 <br /> Benzene 39 1 050 33 5 0 13 116 65-135 0 8 20 <br /> Toluene 218 050 202 039 108 65-135 2 20 <br /> Ethylbenzene 466 050 475 ND 98 65-135 3 20 <br /> Xylenes(total) 235 0 50 240 ND 98 65-135 09 20 <br /> Surrogate a a a-Trtfluorotoluene 344 300 115 65-135 <br /> Surrogate 4-Bromofluorobenzene 313 300 104 65-135 <br /> ,,Sequoia Analytical -Petaluma The results in this report apply to the samples analy2ed 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 8 of 12 <br />