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Sequoia 8Hi Jarvis CA95037 <br /> Morgan 40 C 7 95037 <br /> Analytical (408)776 6300 <br /> FAX(408)782 630$ <br /> www sequoialabs com 0 <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNH0056 <br /> 3017 Kilgore Rd Suite 100 Project Number NIP Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/26/04 18 55 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B18021B -Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limns RPD Limit Notes <br /> Batch 4H05004-EPA 5030B [PIT) <br /> Blank(4H05004-BLK1) Prepared&Analyzed 08/05/04 <br /> Gasoline Range Organics(C4-C 12) ND 12 ppmv <br /> Gasoline Range Organics(C4 C 12) ND 50 mg/ml Air <br /> Benzene NO 016 ppmv <br /> Benzene ND 050 mg/ml Air <br /> Toluene ND 050 " <br /> Toluene ND 013 ppmv <br /> Ethylbenzene ND 012 " <br /> Ethylbenzene ND 050 mg/ml Air <br /> Xylenes(total) ND 024 ppmv <br /> Xylenes(total) ND 1 0 mg/ml Air <br /> Methyl tent butyl ether ND 069 ppmv <br /> Methyl tort-butyl ether ND 25 mg/ml An <br /> Surrogate a a a Trifluorotoluene 6 15 ppmv 6 70 92 56-134 <br /> Surrogate a a a-Tr fluorololuene 367 mg/m'Air 400 92 56-134 <br /> Surrogate 4-Bromofluorobenzene 362 400 90 70-130 <br /> Surrogate 4-Bromofluorobenzene 505 ppmv 559 90 70-130 <br /> Laboratory Control Sample(4H05004-BSI) Prepared&Analyzed 08/05/04 <br /> Benzene 3 00 0 16 ppmv 3 14 46 62-125 <br /> Benzene 958 0 50 mg/ml Air 100 96 62-125 <br /> Toluene 9 67 0 50 " l o 0 97 68-121 <br /> Toluene 257 0 13 ppmv 266 97 68-121 <br /> Ethylbenzene 2 28 0 12 231 99 75-125 <br /> Ethylbenzene 9 89 050 mg/ml Air 100 99 75-125 <br /> Xylenes(total) 299 1 0 300 100 76-121 <br /> Xylenes(total) 690 024 ppmv 6 92 100 76-121 <br /> Methyl tert-butyl ether 866 2 5 mg/ml Air too 87 70 130 <br /> Methyl tert-butyl ether 241 069 ppmv 2 78 87 70-130 <br /> Surrogate a a a-Trifluorotoluene 380 mg/m'Atr 400 95 56-134 <br /> Surrogate a a a-Trifluorotoluene 636 ppmv 6 70 95 56-134 <br /> Surrogate 4-Bromofluorobenzene 5 41 " 559 97 70-130 <br /> Surrogate 4-Bromofluorobenzene 38 7 mg/m'Air 400 97 70-130 <br /> Sequoia Analytical-Morgan Hill The results m this report apply to the samples analyzedin 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 13 of 15 <br />