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819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> SetU.O>la (916)921-9600 <br /> FAX(916)921-0100 <br /> Ilay$IC�� www.sequoialabs.com <br /> RS Sac,Gateway Oaks Project: ARCO 548,Stockton,CA <br /> 2870 Gateway Oaks Dr.,Ste.300 ProjectNumb- 548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project],tanager. Vernon Elarth 07/09/02 16:44 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Au-by DHS LLTFT <br /> Sequoia Analytical_ Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> TNF Total Air(S206352-01)Air Sampled:0612410212:10 Received:06/2410214:45 <br /> Purgeable Hydrocarbons 180 10 mg/m'Air 1 2060347 06/25/02 06/25/02 DHS LUFT FIC-12 <br /> Benzene ND 0.050 " <br /> Toluene 0.23 0.050 " <br /> Ethylbenzene 0.20 0.050 " <br /> Xylenes(total) 3.8 0.050 " <br /> Methyl tert-butyl ether ND 0.54 " <br /> Surrogate:a,a,a-Triftuorotoluene 107% 60-140 " <br /> IINrF Cat Air(S206352-02)Air Sampled: 06/24/0211:45 Received: 0612410214:45 <br /> Purgeable Hydrocarbons 240 10 mg/ml Air 1 2060347 06/25/02 06/25/02 DHS LUFT HC-12 <br /> Benzene ND U50 " <br /> Toluene 0.28 0.050 " <br /> Ethylbenzene 0.92 0.050 <br /> ylenes(total) 5.8 0.050 " <br /> ethyl tert-butyl ether ND 0.50 " <br /> Surrogate:a,a.a-Trifluorotoluene 101 % 60-140 <br /> EFF Air(5206352-03)Air Sampled:0612410211:40 Received:0612414214:45 <br /> Purgeable Hydrocarbon's ND 10 mg/ml Air 1 2060347 06/25/02 06/25/02 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 /> Surrorate:a.a.a-Trifluorotoluene 93% 60-140 " <br /> equoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced in its entirety, <br /> Pace Page 2 of 6 <br />