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1455 t[cDoHell ltd North Ste D <br /> ( 4 Sequoia Petaaluma CA 44914 <br /> (707)792 1865 <br /> • � _ Analytical 7) 2 <br /> wwwsequoialabscom <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P310580 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 11/06/03 I8 54 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Lima Units Dilution Batch Prepared Analyzed Method Notes <br /> Eff(P310580-01)Air Sampled 10/23/03 11 06 Received 10/23/03 14 30 HT-09 <br /> Benzene ND 050 mg/ml Air 1 3110076 11/05/03 11/05/03 EPA 82608 <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> 'toluene ND 0 50 <br /> Xylenes(total) 071 050 " ^ <br /> Surrogate Dibromofluoromethane 105% 84-122 " <br /> Surrogate 1,2-Dtchloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 97% 84-119 " <br /> Benzene ND 016 ppmv <br /> Ethylbenzene ND 012 <br /> Methyl tert-butyl ether ND 0 14 " <br /> Toluene ND 013 <br /> *Xylenes(total) 0 16 0 12 " <br /> Surrogate Dibromofluoromethane 105% 84-122 " ~ <br /> Surrogate 12-Dichloroethane-d4 106% 74-135 <br /> Surrogate Toluene-d8 97% 84-119 <br /> Inf(P310580-02)Air Sampled 10/23/03 11 08 Received 10/23/03 14 30 HT-09 <br /> Benzene ND 5 0 mg/ml Air 10 3110076 11/05/03 11/05/03 EPA 8260E <br /> Ethylbenzene 21 5 0 <br /> Methyl tert-butyl ether 130 5 0 " <br /> Toluene 49 5 0 <br /> Xylenes(total) 83 5 0 <br /> Surrogate Dibromofluoromethane 100% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 105% 74-135 " ~ <br /> Surrogate Toluene-d8 95% 84-119 " <br /> Benzene ND 16 ppmv 10 <br /> Ethylbenzene 4 8 12 <br /> Methyl tert-butyl ether 37 14 <br /> Toluene 13 l3 <br /> Xylencs(total) 19 1 2 <br /> Surrogate Dibromofluoromethane 100% 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 105% 74-135 " ~ <br /> Surrogate Toluene-d8 95% 84-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless other"ase stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 19 <br />