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Sequoia <br />� Analytical <br />404 N WigetLane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequoiaiabs corn <br />Gettler Ryan Inc -Dublin Project Cheaper <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 12 -Apr -00 11 36 <br />Total Purgeable Hydrocarbons (C6 -C12) and BTEX by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />tnalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 0D11002 - EPA 5030E [PIT] <br />Blank (OD I 1002-BLKI) Prepared & Analyzed 11 -Apr -00 <br />Purgeable Hydrocarbons ND 50 ugli <br />11 <br />Benzene <br />ND <br />0 Ju <br />20 0 <br />Toluene <br />ND <br />0 50 " <br />Ethylbenzene <br />ND <br />050 " <br />050 <br />Xylenes (total) <br />ND <br />0 50 <br />70.130 <br />Surrogate aaa-Tnfluorotoluene <br />312 <br />Ethylbenzene <br />300 104 70-130 <br />LCS (OD I 1002 -BS 1) <br />20 0 <br />ND <br />Prepared & Analyzed 11 -Apr -00 <br />Benzene <br />169 <br />050 ugll <br />20 0 84 5 70-130 <br />Toluene <br />180 <br />0 50 <br />200 900 70-130 <br />Ethylbenzene <br />16 5 <br />050 <br />20 0 82 5 70-130 <br />Xylenes (total) <br />573 <br />050 <br />60 0 95 5 70-130 <br />Surrogate qaa-Tri luorotoluene <br />271 <br />70-130 <br />300 903 70-130 <br />Matrix Spike (OD11002-MSI) <br />Matra Spike Dup. (OD11002-MSD1) <br />Source W004026-09 <br />Prepared & Analyzed 11 -Apr -00 <br />Benzene <br />178 <br />0 50 ug/l <br />20 0 <br />ND <br />890 <br />70-130 <br />Toluene <br />198 <br />050 <br />20 0 <br />ND <br />940 <br />70.130 <br />Ethylbenzene <br />178 <br />0 50 <br />20 0 <br />ND <br />890 <br />70-130 <br />Xylenes (total) <br />59 6 <br />050 <br />600 <br />ND <br />993 <br />70-130 <br />Surrogate a a a-Trifluoroioluene <br />161 <br />300 <br />870 <br />70-130 <br />Matra Spike Dup. (OD11002-MSD1) <br />Source W004026-09 <br />Prepared & Analyzed <br />I 1 Apr -00 <br />Benzene <br />175 <br />0 50 ug/i <br />200 <br />ND <br />875 <br />70-130 <br />170 <br />20 <br />Toluene <br />173 <br />050 <br />200 <br />ND <br />86 5 <br />70-130 <br />931 <br />20 <br />Ethylbenzene <br />182 <br />050 <br />200 <br />ND <br />91 0 <br />70-130 <br />222 <br />20 <br />Xylenes (total) <br />589 <br />050 <br />600 <br />ND <br />982 <br />70-130 <br />1 18 <br />20 <br />Surrogate aaa-Trifluorotoluene <br />255 <br />" <br />300 <br />850 <br />70-130 <br />Sequoia Analytical - Walnut Creek The results in chis 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 7 of 12 <br />