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4 Sequoia <br />Analytical <br />404 N WlgetLane <br />Walnut Creek CA 94598 <br />(925) 988-96W <br />FAX (925) 988-9673 <br />www sequoialabs corn <br />Gettler Ryan, Inc - Dubhn Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron #9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 26 -Jul -00 10 48 <br />Total Purgeable Hydrocarbons (C6-02) and BTEX 1n Air by DHS LUFT <br />Sequoia Analytical - Walnut Creek <br />Repotting <br />knalvte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br />EFFLUENT (W007366-05) Air Sampled 19,Jul-00 I2 00 Received 19,Jul-00 14 00 <br />Purgeable Hydrocarbons ND 20 mg/m, Air 02 OG21004 20 -Jul -00 20 -Jul -00 DHS LUFT <br />Benzene 039 0 010 <br />Toluene ND 0 010 " <br />Ethylbenzene ND 0 010 " <br />Xylenes (total) ND 0 010 <br />Surrogate a a,a-Tnfluorotoluene 101 % 70-130 <br />INFLUENT (W007366-06) Air Sampled 19 -Jul -0012 05 Received 19 -Jul -00 14 00 P-02 <br />Purgeable Hydrocarbons 1400 25 mg/ml ALr 25 OG21004 21 -Jul -00 21 -Jul -00 DHS LUFT <br />Benzene 180 013 " <br />Toluene 440 013 " <br />Ethylbenzene 44 0 13 " <br />Xylenes (total) 210 0 13 " <br />40rrogate a a,a-Tnfluorotoluene 212% 70-130 S-04 <br />Analytical - Walnut Creek <br />The results to this report apply to the samples analyzed to accordance with the chain of <br />custody document This analytical report must be reproduced in its entirety <br />0 <br />Page 3 of 11 <br />