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885 Jarvis Drive <br /> Sequoia Morgan Hi11 CA 45037037 <br /> (4018)776 9600 <br /> &V Analytical FAX(406)782 6308 <br /> www sequoialabs com <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 8015B/8021B <br /> Sequoia Analytical-Morgan Hill <br /> Reporting <br /> Analyte Result /amu Units Dilution Batch Prepared Analyzed Method Note <br /> 1NF(MNH0056-01)Air Sampled 08/02/04 12 55 Received 08/04/04 09 30 H <br /> Gasoline Range Organics(C4-C12) 510 100 mg/m'Atr 10 4HO5004 08/05/04 08/05/04 EPA 8015B1 <br /> 80218 <br /> Benzene 61 10 " <br /> Toluene 13 10 " <br /> Ethylbenzene 6 3 1 0 " ^ <br /> Xylenes(total) 50 2 0 <br /> Methyl tert-butyl ether 170 5 0 <br /> Surrogate aa a-Trifluorotoluene 90% 56-134 " <br /> Surrogate 4-Bromofluorobenzene 103% 70-130 <br /> Gasoline Range Organics(C4-C12) 150 24 ppmv 10 <br /> Benzene 19 031 <br /> Toluene 3 5 027 ^ <br /> Ethylbenzene 15 023 <br /> Xylenes(total) 12 047 <br /> Methyl tert-butyl ether 48 14 ^ <br /> Surrogate a a,a-Trifluorotoluene 90% 56-134 <br /> Surrogate 4-Bromofluorobenzene 103% 70-130 " <br /> AS EFF(MNS0056-02)Air Sampled 08/02/04 12 45 Received 08/04/04 09 30 H <br /> Gasoline Range Organics(C4-C12) 23 20 mg/ml Air 2 4HO5004 09/05/04 08/05/04 EPA 8015B1 <br /> 8021B <br /> Benzene 1 1 020 ^ ^ <br /> Toluene 21 020 <br /> Ethylbenzene 054 020 <br /> Xylenes(total) 2 7 040 <br /> Methyl tart-butyl ether 13 10 <br /> Surrogate aa a-Trruorotoluene 95% 56-134 " <br /> Surrogate 4-Bromofluorobenzene 99% 70-130 <br /> Gasoline Range Organics(C4-C12) 6 5 4 9 ppmv 2 <br /> Benzene 034 0 063 " <br /> Toluene 056 0 053 <br /> Ethylbenzene 012 0 046 " <br /> Xylenes(total) 061 0 095 <br /> Methyl tert-butyl ether 3 5 028 <br /> Surrogate aa a-Trruorotoluene 96% 56-134 <br /> Surrogate 4-Bromofluorobenzene 98% 70-130 " <br /> Sequoia Analytical-Morgan Hili 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 6 of 15 <br />