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S e qu^i a 819 Striker Avenue,Suite 8 <br /> lJ'1E Sacramento, CA 95834 <br /> (9 16)921-9600 <br /> Analyty cal FAX(916)921-0100 <br /> Ji wwti+.sequolalahs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr.Ste 550 Project Number: 548,Stockton,CA Repotted: <br /> Cameron Park CA,95682 Project Manager: Steve Carter 02/14/02 14:43 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Air by DHS LUFT <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Satcb Prepared Analyzed Method Notes <br /> INF Total Air(S202027-01)Air Sampled:02/04/02 12:00 Received: 02/04/02 14:09 <br /> Purgeable Hydrocarbons 570 500 mg/m'Air 50 2020054 02/05/02 02/05/02 DHS LUFT HC-12 <br /> Benzene ND 2.5 " <br /> Toluene 9.1 2.5 <br /> Ethylbenzene ND 2.5 " <br /> Xylenes(total) 25 2.5 " <br /> Methyl tert-butyl etber ND 25 <br /> Surrogate:a,a,a-Trifluorotoluene 98,5% 60-140 " <br /> INF CAT Air(5202027-02)Air Sampled:02/04/0211:56 Received: 02/04/02 14:09 <br /> Purgeable Hydrocarbons' 600 500 mg/m9 Air 50 2020054 02/05/02 02/05/02 DHS LUFT HC-12 <br /> Benzene ND 2.5 <br /> Toluene 6.2 2.5 <br /> Ethylbenzene ND 2.5 " <br /> lenes(total) 21 2.5 <br /> ethyl tert-butyl ether ND 25 <br /> Surrogate:a,a,a-Tris luorotoluene 95,5% 60-140 <br /> EFF Air(S202027-03)Air Sampled: 02/0410211:54 Received:0210410214.09 <br /> Purgeable Hydrocarbons ND 10 mg/m'Air 1 2020054 .. 02/05/02 02/05/02 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 tert-butyl ether ND 0.50 <br /> Surrogate:a,a,a-Trifluorotoluene 90.0% 60-140 " <br /> quoia 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 2 of 6 <br />