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QSequoia <br />,q„� Analytical <br />404 N Wiget lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs Gam <br />Gettler Ryan, Inc, - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 24 -Jul -00 11 33 <br />Total Purgeable Hydrocarbons (C6 -C12) and BTEX in Air by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Splice Source %REC RPD <br />knalyte Result Lmt Units Level Result %REC Limits RPD Lutut Notes <br />Batch OG21017 - EFA 5030B [PIT] <br />127 <br />0 010 mglm' Air <br />200 <br />Blank (OG21017-BLK1) <br />65-120 V -U1 <br />Toluene <br />Prepared & Analyzed 13 -Jul -00 <br />Purgeable Hydrocarbons <br />ND <br />2 0 <br />mg/ml Air <br />Benzene <br />ND <br />0 010 <br />200 <br />Toluene <br />ND <br />0 010 <br />500 <br />Ethylbenzene <br />ND <br />0 010 <br />65-120 <br />lvlenes (total) <br />ND <br />0 010 <br />600 <br />Surrogate a a a -Tri luoro[oluene <br />680 <br />600 113 70-130 <br />LCS (OG21017-BS1) <br />Prepared & Analyzed 13 -Jul -00 <br />Benzene <br />127 <br />0 010 mglm' Air <br />200 <br />635 <br />65-120 V -U1 <br />Toluene <br />156 <br />0 010 <br />200 <br />780 <br />65-120 <br />Ethylbenzene <br />143 <br />0 010 <br />200 <br />71 5 <br />65 120 <br />Xylenes (total) <br />500 <br />0 010 <br />600 <br />833 <br />65-120 <br />,mWurrogai a a a-Tnfluorotoluene <br />500 <br />600 <br />833 <br />70-130 <br />feq�uoia alyt>cal - Walnut Creek The results ni this report apply to the samples analysed m accordance with the chain of <br />custody docurnem This analytical report must be reproduced In its entirely <br />Page 10 of 15 <br />