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S e qu o a 8 i 9 Striker Avenue,Suite 8 <br /> 1 Sacramento,CA 95$34 <br /> FAX{9 16)921-96W <br /> 916)921-0 100 <br /> Analytical www.sequoialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr, Ste 550 Project Number: 548,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Steve Carter 03/11/02 13:27 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Air by DHS LUFT <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF Total Air(S203052-01)Air -Sampled: 03/04/02 07:21 Received: 03/04/02 10:55 <br /> Purgeabie Hydrocarbons 580 500 mg/m°Air 50 2030064 03/05/02 03/05/02 DHS LUFT <br /> Benzene ND 2.5 " <br /> Toluene 4.1 2.5 " <br /> Fthylbenzene 12 2.5 " <br /> Xylenes(total) 84 2.5 " <br /> Methyl tert-butyl ether ND 25. _ <br /> Surrogate:a,a,a-Triuorotoluene 102% 66-140 " <br /> INF Cat Air(S203052-02)Air Sampled: 03/04/02 07:18 Received: 03/04/02 10:55 <br /> Purgeabie Hydrocarbons 670 100 mg/m'Air 10 2030064 03/05/62 03/05/02 DHS LUFT <br /> Benzene 1.8 0.50 " <br /> Toluene 1.1 0.50 " <br /> thylbenzene 1.1 0.50 <br /> lenes(total) 16 0.50 <br /> _ethyl tert-butyl ether _ ND 5.0 <br /> Surrogate:a,a,a-Trifluorotoluene 120% 60-140 <br /> EFF Air(5203052-03)Air Sampled: 03/04/02 07.15 Received:03/04/02 10:55 <br /> Purgeable Hydrocarbons ND 10 mg/m'Air 1 2030064 03/05/02 03/05/02 DHS LUFT <br /> Benzene ND 0.050 " <br /> Toluene ND 0.050 " <br /> Ethylbenzene ND 0.050 <br /> Xylenes(total) ND 0.050 " <br /> Methyl tent-butyl ether ND 0.50 <br /> Surrogate:a,a,a-Triuorotoluene 106% 60-140 <br /> equoia Analytical- Sacialmento The results in this report apply io the samples analyzed in accordance with the chain of <br /> custody document. This analytical-report must be reproduced in its entirety. <br /> Page 2 of 6 <br />