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a_ _� <br /> 8$5 larvas Drive <br /> Sequoia MorganHtll CA 95037 <br /> (408)776 9600 <br /> Analytical FAX(408)782 6308 <br />-� www sequotalabs coin <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNB0056 <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 801513/8021B- Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Llmt[ Units Level Result %REC Ltmit3 RPD limit Notes <br /> Batch 4HO5004-EPA 5030B [PITT <br /> Laboratory Control Sample(4H05004-BS2) Prepared&Analyzed 08/05/04 <br /> Gasoline Range Organics(C4 C12) 212 50 mg/ml Air 250 85 65-142 <br /> Gasoline Range Organics(C4-C 12) 602 12 ppmv 709 85 65 142 <br /> Surrogate a a a Trfluorctoluene 378 mg/m'Air 400 94 56-134 <br /> Surrogate a a a Trifluorotoluene 634 ppmv 670 95 56-134 <br /> Surrogate 4 Bromofluorobenzene 414 mg/m'Air 400 104 70-130 <br /> Surrogate 4 Bromofluorobenzene 579 ppmv 559 104 70-130 <br /> Laboratory Control Sample Dup(4H05004-BSD1) Prepared&Analyzed 08/05/04 <br /> Benzene 908 050 mg/m'Air 100 91 62-125 5 31 <br /> Benzene 2 85 0 16 ppmv 3 14 91 62-125 5 31 <br /> Toluene 241 0 13 " 2 66 91 68-121 6 29 <br /> Toluene 907 050 mg/ml Air 100 91 68-121 6 29 <br /> Ethylbenzcne 9 33 050 100 93 75-125 6 32 <br /> Ethylbenzene 2 15 0 12 ppmv 2 31 93 75-125 6 32 <br /> Xylenes(total) 652 024 " 692 94 76-121 6 29 <br /> Xylenes(total) 282 10 mg/m'Air 300 94 76-121 6 29 <br /> Methyl tert butyl ether 804 25 100 80 70 130 7 25 <br /> Methyl tert butyl ether 223 069 ppmv 278 g0 70-130 8 25 <br /> Surrogate a a a-T rifluorotoluene 5 82 " 670 87 56-134 <br /> Surrogate a a a-Trifluorotoluene 34 7 mg/m'Arr 400 87 56-134 <br /> Surrogate 4-Bromofluorobenzene 348 400 87 70-130 <br /> Surrogate 4 Bromofluorobenzene 486 ppmv 5 59 87 70-130 <br /> Laboratory Control Sample Dup(4H05004-BSD2) Prepared&Analyzed 08/05/04 <br /> Gasoline Range Organics(C4-Cl2) 60 6 12 ppmv 709 85 65-142 07 50 <br /> Gasoline Range Organics(C4-C12) 213 50 mg/m'Air 250 85 65-142 0 5 50 <br /> Surrogate a a a-T rifluorotoluene 627 ppmv 6 70 94 56-134 <br /> Surrogate a a a-TrIfluorotoluene 374 mg/m'Air 400 94 56 134 <br /> Surrogate 4-Bromofluorobenzene 5 62 ppmv 559 101 70-130 <br /> Surrogate 4-Bromofluorobenzene 402 mg/m'Air 400 100 70-130 <br /> Sequoia Analytical-Morgan H1Il 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 ris entirety <br /> Page 14 of 15 <br />