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a_ _� (985 Jarvis Drive Sequoia Morgan Hill,CA 95037 maw Analytical cal 408)771-9600 ,7 ` FAX(408)782-6309 www.sequoialabs.corr URS Corporation I11 Project: ARCO#548,Stockton,Ca 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: Sacramento CA,95833 Project Manager: Vern Elarth 10/09/02 08:29 Total Purgeable Hydrocarbons(C&C10) by EPA 8015B modified,BTEX by EPA 8021B in Air Sequoia Analytical-Morgan Hill Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes INF Total Air ML10645-01 Air Sampled:09/24/02 08:30 Received:09/25/02 20:30 Gasoline Range Organics(C6-C10) 99 12 ppmv 5 2127003 09/27/02 09/27/02 SO15Bm/8021 NC-12 B Benzene ND 0.16 Toluene 0.70 0.13 " Ethylbenzene ND 0.12 Xylenes(total) 33 0.12 " Methyl tert-butyl ether ND 0.69 " Surrogate:a,a,a-Trirluorotoluene 157% 70-130 S-02 INF Cat Air(MLI0645_o2)Air Sampled:09124/02.08:25 Received:09/25/02 20:30 Gasoline Range Organics(C6-C10) 100 24 ppmv 10 2127003 09/27/02 09/27/02 8015Bm/8021 HC-12 B Benzene ND 0.31 " Toluene 0.84 0.27 " Ethylbenzene ND 0.23 ylenes(total) 3.9 0.23'ROPNI „ ethyl tert-butyl ether ND 1.4 " Surrogate:a,a,a-Trilluorotoluene 154% 70-130 S-02 Eff Air MLI0645-03 Air Sampled-09/24/02 08:20 Received:09/25/02 20:30 Gasoline Mange Organics(C6-C10) ND 2.4 ppmv 1 2127003 09/27!02 09/27/02 8015Bm/8021 B Benzene ND 0.031 Toluene ND 0.027 Ethylbenzene ND 0.023 Xylenes(total) ND 0.023 ^ Methyl tert-butyl ether ND 0.14 " Surrogate:a,a,a-TriJluorotoluene 87.8% 70-130 " I I . I I I I Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain ofcusiody document. This analytical report must be reproduced in its entirety. 4of8