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r <br /> .n d� Sequoia 1455 McDowell Hlvd,North Ste D <br /> Petaltinv%CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs cam <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P305581 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/13/03 09 42 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B- Quality Control <br /> Sequoia Analytical- Petaluma <br /> RcPrnunB Spike Source 0KREC RPD <br /> Analyte Result Bait units Level Result YGREC Limts RPD limit Notes <br /> Batch 3060107-EPA 5030,waters <br /> Blank 3060107-BLKI) Prepared&Analyzed 06/05/03 <br /> Gasoline Range Organics ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate_ a a,a-Tri luorotoluene 310 300 103 65-135 <br /> Surrogate 4-Bromofluorobenzene 294 300 98 65-135 <br /> Laboratory Control Sample(3060107-BSI) Prepared&Analyzed 06/05/03 <br /> Gasoline Range Organics 2520 50 ug/1 2750 92 65-135 <br /> Benzene 429 050 33.5 128 65-135 <br /> Toluene 224 050 202 111 65-135 <br /> �,hylbenzene 45 8 050 47 5 46 65-135��(��l) 240 0 54 240 100 65-135 <br /> Surrogate a a a-Tr to. <br /> 340 300 II3 65-135 <br /> Surrogate 4 Bromolluorobenzene 315 300 105 65-135 <br /> Matrix Spike(3060107-MSI) Source P305581-08 Prepared&Analyzed 06/05/03 <br /> Gasoline Range Organics 2180 50 ug/1 2750 22 78 65-135 <br /> Benzene 356 050 335 0 22 106 65-135 <br /> Toluene 228 050 202 039 113 65-135 <br /> Ethylbenzene 467 050 475 025 98 65-135 <br /> Xylenes(tom) 244 050 240 0 31 102 65-135 <br /> Surrogate a aa-Trii luarotoluene 323 300 108 65-135 <br /> Surrogate 4 Bromofluorobenzene 306 " 300 102 65-135 <br /> Matnx S >tke Du (3060107-MSD1) Source P305581-08 Prepared&Analyzed 06/05/03 <br /> Gasoline Range Organics 2170 50 ug/i 2750 22 78 65-135 0 5 20 <br /> Benzene 34 8 050 33 5 022 103 65-135 2 20 <br /> Toluene 221 0 50 202 039 109 65-135 3 20 <br /> Ethylben=e 458 050 47 5 0.25 96 65-135 2 20 <br /> Xylenes(total) 236 050 240 031 98 65-135 3 20 <br /> Surrogate a a a-Trifluorotoluene 320 300 107 65-135 <br /> Surrogate 4 Bromofluorobenzene 309 300 103 65-135 <br /> 40 quota Analytical-Petaluma The results in this report apply to the samples analwed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> Thu analytical report must be reproduced in its entirety <br /> Page 9 of 13 <br />