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`[�Sequoia <br /> p xit[� 819 Striker Avenue,Suite 8 <br /> V 1 a Sacramento,CA 95634 <br /> 1 (916)921-9600 <br /> FAX(916)921-0100 <br /> Ana_ 1L yt i C a l www.sequoialabs.corn <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 01/18/02 10:19 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Air (ppmv) by DHS LUFT <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dikution Batch Prepared Analyzed Method Notas <br /> INF Total Air(S201117-01)Air Sampled:01/08/0206:07 Received: 01/08/02 08:10 <br /> Purgeable Hydrocarbons 210 14 ppmv 5 2010193 01/11/02 01/11/02 DHS LUFT HC-12 <br /> Benzene ND 0.080 <br /> Toluene 0.62 0.065 " <br /> Ethylbenzene 0-62 0.060 <br /> Xylenes(total) 6.9 0.060 " <br /> Methyl tert-butyl ether ND 0.70 <br /> Surrogate:a,a,a-Trifluorotoluene 75.8% 60-140 <br /> INF CAT Ail-(5201117-02)Air Sampled: 01/0810206:04 Received:01/08/0208:10' <br /> Purgeable Hydrocarbons 290 28 ppmv 10 2010193' 01/1.1/02 01/11/02 DHS LUFT HC-12 <br /> Benzene 0.19 0.16 " <br /> Toluene 0.64 0.13 " <br /> thylbenzene 0.91 0.12 " <br /> lenes(total) 10 0.12 " <br /> ethyl tert-butyl ether ND 1.4 " <br /> Surrogate:a,a,a-Tris luorotoluene 87.8% 60-140 <br /> EFF Air(S201117-03)Air Sampled: 01/08/0206:01 Received:01/08/02 08:10 <br /> Purge6ble Hydrocarbons ND 2.8 ppmv 1 2010193 01/11/02 01/11/02 DHS LUFT <br /> Benzene ND 0.016 <br /> Toluene ND 0.013 " <br /> Ethylbenzene ND 0.012 " <br /> Xylenes(total) ND 0.012 " <br /> Methyl tert-butyl ether 0.20 0.14 <br /> Surrogate:a,a,a-Trifluorotoluene �• 82.1 % 60-140 " <br /> equoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 3 of 6 <br />