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Dri <br /> SJarvis3SeauQ]d Morgan <br /> Hill,CA95037 <br /> (408)7769608 <br /> iWFAX 782 6308 <br /> Analytical www sequoiala6s con, <br /> . <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MN10277 <br /> 3017 Kilgore Rd Suite 100 Project Number NIP Reported <br /> Rancho Cordova CA,95670 Project Manager RustyBenkosky 09/23/04 16 56 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC [LPD <br /> Analyte Result Limit Units Level Result %FEC Limus RPD lama Notes <br /> Batch 4I13005-EPA 5030B (PIT] <br /> Blank(4113005-BLKI) Prepared&Analyzed 09/13/04 <br /> Gasoline Range Organics(C4 C 12) ND 24 ppmv <br /> Gasoline Range Organics(C4 C 12) ND 10 mg/ml Air <br /> Benzene ND 0 031 ppmv <br /> Benzene ND 0 W mg/m'Air <br /> Toluene ND 0 027 ppmv <br /> Toluene ND 0 10 mg/m'Air <br /> Ethytbenzene ND 0 023 ppmv <br /> Ethylbenzene ND 0 10 mg/ml Air <br /> Xylenes(total) ND 0 047 ppmv <br /> Xylenes(total) ND 0 20 mg/m'Air <br /> Methyl tert butyl ether ND 050 " <br /> Methyl tert-butyl ether ND 0 14 ppmv <br /> Surrogate a a a-Try7uoroioluene 114 134 85 56-134 <br /> Surrogate a a a-Trifluorotoluene 6 83 mg/m'Air 800 85 56-134 <br /> Surrogate 4-Bromofluorobenzene 105 ppmv 112 94 70130 <br /> Surrogate 4-Bromofluorobenzene 752 mgIW AIr 800 94 70-130 <br /> Laboratory Control Sample(4113005-BS1) Prepared&Analyzed 09/13/04 <br /> Benzene 0 704 0 031 ppmv 0 627 112 62 125 <br /> Benzene 225 010 mg/ml Air 200 112 62 125 <br /> Toluene 0 599 0 027 ppmv 0 532 113 58-121 <br /> Toluene 225 0 10 mg/ml Air 200 112 68-121 <br /> Ethylbenzene 0 514 0 023 ppmv 0 462 111 75-125 <br /> Ethylbenzene 223 010 mg/ml Air 200 112 75-125 <br /> Xylenes(total) 6 80 020 600 113 76-121 <br /> Xylenes(total) 1 57 0 047 ppmv 1 38 114 76-121 <br /> Methyl ten butyl ether 132 014 11 1 11 119 70-130 <br /> Methyl tent-butyl ether 4 76 050 mg/m'Air 400 119 70-130 <br /> Surrogate a a a-Trtfluorotoluene 130 ppmv 134 97 56-134 <br /> Surrogate a a a-Trifluorotoluene 7 76 mg/m'Air 800 97 56-134 <br /> Surrogate 4-Bromofluorobenzene 808 800 101 70-130 <br /> Surrogate 4-Bromofluorobenzene 113 ppmv 112 101 70130 <br /> Sequoia Analytical-Morgan Hill 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 12 of 15 <br />