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Sequoia <br />Analytical <br />404 N Wlget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />Wier Ryan laic -Dublin ProleLt Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 18 -Apr -00 11 39 <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 />knalvte Result Limit Units Level Result %REC Limit, RPD Limit Notes <br />Batch 0D 17003 - EPA 50306 [PIT] <br />Blank (OD17003-BLKI) Prepared & Analyzed 17 -Apr -00 <br />Purgeable Hydrocarbons ND 50 ugll <br />Benzene ND 050 <br />Toluene ND 050 <br />Ethvlbenzene ND 050 <br />Xvienes (total) ND 0 50 <br />Surrogate aqa-Triluororoluene <br />300 <br />300 <br />100 70-1-10 <br />LCS (OD17003-BSI) <br />Prepared & Analvzed <br />17 -Apr -00 <br />Benzene <br />207 <br />050 ugll <br />200 <br />104 70-130 <br />Toluene <br />210 <br />050 <br />200 <br />105 70-130 <br />Ethyllbenzene <br />212 <br />050 <br />200 <br />106 70-130 <br />Xylenes (total) <br />62 1 <br />050 <br />600 <br />103 70-130 <br />ate rx a, a•Trifluoroioluene <br />289 <br />300 <br />963 70-130 <br />Matm Spike (OD17003-MSI) <br />Source W004143-09 <br />Prepared & Analyzed <br />17 -Apr -00 <br />Benzene <br />200 <br />0 50 ugli <br />200 ND <br />100 70-130 <br />Toluene <br />202 <br />0 50 <br />200 ND <br />101 70-130 <br />Ethylbenzene <br />203 <br />0 50 <br />20 0 ND <br />101 70-130 <br />Xyleus (total) <br />588 <br />050 <br />600 ND <br />980 70.130 <br />Surrogate AAa-Tnfluorotoluene <br />28 5 <br />300 <br />950 70-130 <br />Matrix Spike Dup (OD17003-MSD1) <br />Source W004143-09 <br />Prepared & Analyzed <br />17 -Apr -00 <br />Bamme <br />222 <br />030 ug/I <br />200 ND <br />111 70-130 <br />104 <br />20 <br />Toluene <br />223 <br />050 <br />20 0 ND <br />111 70-130 <br />9 88 <br />20 <br />Ethylbenzene <br />22 6 <br />050 " <br />20 0 ND <br />113 70-130 <br />107 <br />20 <br />Xylenes (total) <br />638 <br />050 <br />600 ND <br />106 70-130 <br />8 16 <br />20 <br />Surrogate a,a,a-Trrr luonotoluene <br />300 <br />300 <br />100 '0-130 <br />S uola Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in as entirety <br />Page 14 of 22 <br />.* <br />