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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 />Iiettler Ryan, In(. - Dublin Project Chevron <br />6747 Steric Court Suite I Project Number Chevron # 9-5775 Reported <br />Dublin CA, 94568 Project Manager Barbara Siermnski 05 -tan -00 10 22 <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 />kndlyte Result Limit Units Level Result %REC Llmits RPD Limit Notes <br />Batch OA03003 Prepared 03 -Jan -00 Using EPA 5030B [MeOH] <br />Blank (OA03003-BLKI) <br />Purgeable Hydrocarbons <br />ND <br />1 0 mg/kg <br />0 800 <br />ND <br />113 <br />Benzene <br />ND <br />00050 " <br />Toluene <br />0 894 <br />00050 <br />Toluene <br />ND <br />00050 " <br />50-150 <br />Ethylbenzene <br />ND <br />00050 <br />0 800 <br />ND <br />113 <br />\vlenes (total) <br />ND <br />00050 " <br />Xylenes (total) <br />274 <br />00050 <br />Methyl tent -butyl ether <br />ND <br />0 050 " <br />50.150 <br />Surrogate a a a-Trrfluorotoluene <br />0 770 <br />0 050 <br />01500 <br />128 <br />40-140 <br />LCS (OA03003-BSI) <br />Surrogate g a a-Tnfluorololuene <br />0 651 <br />Benzene <br />0 844 <br />00050 mg/kg <br />0 800 <br />105 <br />50450 <br />Toluene <br />0 844 <br />00050 <br />0 800 <br />105 <br />50450 <br />ylhenzene <br />0858 <br />00050 " <br />0800 <br />107 <br />50-150 <br />fenes (total) <br />260 <br />00050 <br />240 <br />108 <br />50-150 <br />Methyl tart -butyl ether <br />0 632 <br />0 050 <br />0 800 <br />79 0 <br />50-150 <br />Surrogate a a a -Tr fluauotoluene <br />0 6SO <br />0 952 <br />0 600 <br />108 <br />40-140 <br />Matrix Spice (OA03003-MSI) <br />50-150 <br />4 73 <br />20 <br />Source W912522-08 <br />Benzene <br />0 906 <br />00050 mg/kg <br />0 800 <br />ND <br />113 <br />50-150 <br />Toluene <br />0 894 <br />00050 <br />0 800 <br />ND <br />112 <br />50-150 <br />Ethylbenzene <br />0 908 <br />00050 <br />0 800 <br />ND <br />113 <br />50-150 <br />Xylenes (total) <br />274 <br />00050 <br />240 <br />0 016 <br />113 <br />50.150 <br />Methyl Cert -butyl ether <br />1 13 <br />0 050 <br />0 800 <br />039 <br />925 <br />50450 <br />Surrogate g a a-Tnfluorololuene <br />0 651 <br />0 600 <br />109 <br />40-140 <br />Matrix Spike Dup (OA03003-MSD1) <br />Source W912522-08 <br />Benzene <br />0 950 <br />00050 mglkg <br />0 800 <br />ND <br />119 <br />50-150 <br />474 <br />20 <br />Toluene <br />0 942 <br />00050 <br />0 800 <br />ND <br />118 <br />50-150 <br />5 23 <br />20 <br />Ethylbenzene <br />0 952 <br />00050 <br />0 800 <br />ND <br />119 <br />50-150 <br />4 73 <br />20 <br />Xylenes (total) <br />2 84 <br />00050 <br />240 <br />0 016 <br />118 <br />50-150 <br />3 58 <br />20 <br />Methyl tent -butyl ether <br />1 14 <br />0 050 <br />0 800 <br />039 <br />937 <br />50.150 <br />0 881 <br />20 <br />Surrogate a a a-Trrfluorotoluene <br />0 676 <br />0 600 <br />113 <br />40-140 <br />Sequoia Analytical - Walnut Creek <br />• <br />CwAanaernip), a ratory ltarctor <br />The resultr to flax report apply to the sarnple r analyzed t n accordance with the churn of <br />custody document Tits aralytical report imus! be reproduced to i is entirety <br />Page 12 of 15 <br />