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885 Jarvis Dr <br /> Sequoia Mcr pn Hill,CA 95037 <br /> ' ►= 9600 <br /> Analytical (40si7s <br /> FAx ao <br /> www.sequoialabs.cun <br /> URS Corporation(1] Project: ARCO#548,Stockton,Ca MLK0692 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 12/02/02 13:43 <br /> Total Purgeable Hydrocarbons (C6-C10)by EPA 8015B modified,BTEXM by EPA 8021B <br /> Sequoia Analytical-Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF Total Air(MLK0692-01)Air Sampled: 11/19/02 13:30 Received: 11/19/02 15:00 <br /> Gasoline Range Organics(C6-C10) 79 10 ug/1 1 2K22004 11/22/02 11/22/02 8015Bm1802IB HC-12 <br /> Benzene 0.15 0.10 <br /> Toluene 1.4 0.10 " <br /> Ethylbenzene 0.39 0.10 " <br /> Xylenes(total) 3.9 0.10 " <br /> Methyl tent-butyl ether 0.53 0.50 " <br /> Surrogate:a a,a-Trifluorotoluene 174% 55-141 " S-02 <br /> INF Cat Air(MLK0692-02)Air Sampled: 11/19/02 13:25 Received: 11/19/02 15:00 - <br /> Gasoline Range Organics(C6-CIO) 74 10 ug/I 1 2K22004 11/22/02 11/22/02 8015Bm/8021B HC-12 <br /> Benzene 0.16 0.I0 " <br /> Toluene 1.6 0.10 " <br /> Ethylbenzene 0.43 0.10 " <br /> Xylenes(total) 4.2 0.10 " <br /> Methyl tert-butyl ether 0.57 0.50 " <br /> W <br /> urrogate:a,a,a-Trifluorotoluene 55.5% 55-142FF Air(MLK0692-03)Air Sampled:11/19/0213:20 Received:11119/02.15:00 <br /> Gasoline Range Organics(C6-C10) ND 10 ug11 1 2K22004 11/22/02 11/22/02 8015Bm/8021B <br /> Benzene ND 0.10 " <br /> Toluene 0.36 0.10 " <br /> Ethylbenzenc ND 0.10 " <br /> Xylenes(total) ND 0.10 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate.,a,a,a-Trifluorotoluene 104% 55-142 " <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 /> 4 of 9 <br />