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QSequoia <br />Analytical <br />404 N Wiget lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs Com <br />Ge�•Hier-- - - - <br />Ryan, Inc - Dublin Project Cheaper <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublm CA 94568 Project Manager Scott Polston 12 -Apr -00 11 36 <br />Total Purgeable Hydrocarbons (C6-Ct2) and BTEX In Air by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spire Source %REC RPD <br />knalvte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD10015 - EPA 50305 [PIT} <br />570 <br />600 950 70-130 <br />Blank (OD100I5-BLK1) <br />Prepared &Analyzed 06 -Apr -00 <br />Purgeable Hydrocarbons <br />ND <br />2 0 inglm3 Air <br />mg/ml Air 200 825 70-130 <br />Benzene <br />ND <br />0 010 <br />200 850 70-130 <br />Toluene <br />ND <br />0 010 <br />200 800 70-130 <br />Ethylbenzene <br />ND <br />0 010 <br />600 917 70-130 <br />Xylenes (total) <br />ND <br />0 010 <br />600 853 70-130 <br />Surrogate as a-Trtifluorololuene <br />5 72 <br />600 953 70-130 <br />Blank (OD10015-BLK2) <br />340 <br />0 010 <br />Prepared & Analyzed 08 -Apr -00 <br />Purgeable Hydrocarbons <br />ND <br />2 0 mg/ml Air <br />400 875 70.130 <br />Benzene <br />ND <br />0 010 <br />400 87 0 70-130 <br />Toluene <br />ND <br />0 010 " <br />120 958 70-130 <br />Ethylbenzene <br />ND <br />0 010 <br />600 900 70-130 <br />blenes (total) <br />ND <br />0 010 " <br />Surrogate a a a-Tnfluorotoluene <br />570 <br />600 950 70-130 <br />LCS (OD10015-BS1) <br />Prepared & Analyzed 06 -Apr -00 <br />Benzene <br />165 <br />0 010 <br />mg/ml Air 200 825 70-130 <br />Toluene <br />170 <br />0 010 <br />200 850 70-130 <br />Ethylbenzene <br />160 <br />0 010 <br />200 800 70-130 <br />Nylenes (total) <br />5 50 <br />0 010 <br />600 917 70-130 <br />Surrogate a a a -Tri luorotoluene <br />512 <br />600 853 70-130 <br />LCS (OD10015-BS2) <br />Prepared & Analyzed 08 -Apr -00 <br />Benzene <br />340 <br />0 010 <br />mglrri3 Air 400 950 70-130 <br />Toluene <br />3 50 <br />0 010 <br />400 875 70.130 <br />Ethylbenzene <br />348 <br />0 010 <br />400 87 0 70-130 <br />Nylenes (total) <br />115 <br />0 010 <br />120 958 70-130 <br />Surrogate aga-Tnfluorotoluene <br />540 <br />600 900 70-130 <br />equota Analytical - Walnut Creek The results in this report ripply to the samples analyzed in accordance with the than of <br />custody document This analytical report must be reproduced in its entirety <br />Page 8 of 12 <br />0 <br />