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I i Sequoia <br />1wAnalytical <br />404 N Wiget Lane <br />Walnut Creek, CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs Corn <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 Deanna L Hardmg 29 -Jul -00 17 31 <br />Total Purgeable Hydrocarbons (C6 -C12), BTEX and MTBE by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analyte Result Lunrt Uruts Level Result %REC Lunrts RPD Lurut Notes <br />Batch OG27002 - EPA 5030B [PIT] <br />Source W007341 -M <br />Prepared & Analyzed. 27 -Jul -00 <br />Blank (OG27002-BLKI) <br />Prepared & Analyzed 27 -Jul -00 <br />Purgeable Hydrocarbons <br />ND <br />50 ugll <br />Benzene <br />ND <br />050 " <br />Toluene <br />ND <br />050 " <br />Ethylbenzene <br />ND <br />050 " <br />Xylenes (total) <br />ND <br />050 " <br />Methyl text -butyl ether <br />ND <br />25 " <br />Surrogate Aaa-Tnfluorotoluene <br />300 " 300 100 70-130 <br />LCS (OG27002-BSI) <br />Source W007341 -M <br />Prepared & Analyzed. 27 -Jul -00 <br />Prepared & Analyzed 27 -Jul -00 <br />Benzene <br />180 <br />050 ug/l <br />200 900 70-130 <br />20 <br />Toluene <br />187 <br />050 <br />200 935 70-130 <br />20 <br />Ethylbenzene <br />197 <br />050 <br />200 985 70-130 <br />20 <br />Xylenes (total) <br />583 <br />050 <br />600 972 70-130 <br />20 <br />Surrogate a a,a-Tr:Jluorotoluene <br />171 <br />300 903 70-130 <br />Matra Sp*e (OG27002-Ml) <br />Source W007341-04 <br />Prepared & Analyzed 27 -Jul -00 <br />Benzene <br />170 <br />050 ug/1 <br />200 ND 850 70-130 <br />Toluene <br />175 <br />050 " <br />200 ND 975 70-130 <br />EthyMmzem <br />193 <br />050 <br />200 ND 915 70-130 <br />Xylenes (total) <br />553 <br />050 <br />600 ND 97-2 70-130 <br />Surrogate aaa-ThOtarotoluene <br />173 <br />3aO 910 70.130 <br />Matra Sp&e Dup (OG27002-MSD1) <br />Source W007341 -M <br />Prepared & Analyzed. 27 -Jul -00 <br />Benzene <br />166 050 ug4 <br />200 ND 930 70-130 <br />238 <br />20 <br />Toluene. <br />171 050 " <br />200 ND 855 70-130 <br />231 <br />20 <br />Ethylbenzene <br />179 050 <br />200 ND 895 70-130 <br />221 <br />20 <br />XyImes (total) <br />536 050 " <br />600 Nil 893 70-130 <br />312 <br />20 <br />4g a-Trrjiuorotoluene 275 300 917 70-130 <br />Sequoia ATWyucai - Walnut Creeds The results to this report apply to the smnples analyzed in accorvdmrce with the churn o <br />custody document Tins analytical report must be reproduced in its en"rem <br />Page 21 of 26 <br />D.A. <br />