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Sequoia �`" WEAK Lane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />,! 4 FAX (925) 988-9673 <br />D- Analytical � � com <br />ter Ryan Inc - Dublin Project Chevron <br />6747 Sterna Court Suite J Project Number Chevron 49-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 14 -Jun -00 07 58 <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 Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OF09001 - EPA 5030B [PIT] <br />Blank (OF09001-BLKI) Prepared & Analyzed 09 -Jun -00 <br />Purgeable Hydrocarbons ND 50 ug/l <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 tert-butyl ether <br />ND <br />2 5 <br />Surrogate aaa-Tnfluorotoluene <br />313 <br />300 104 -0-130 <br />LCS (OF09001-BSI) <br />Prepared & Analyzed 09 -Jun -00 <br />Benzene <br />179 <br />0 50 ug/i <br />200 895 70-130 <br />Toluene <br />196 <br />0 50 <br />200 980 70-130 <br />Ethylbenzene <br />226 <br />0 50 <br />200 113 70-130 <br />(u�) <br />Wg-, <br />647 <br />050 <br />60 0 108 70-130 <br />as a -Tri luorotoluene <br />268 <br />300 893 70130 <br />Matrix Spike (OF09001-MSI) <br />Source W005776-02 <br />Prepared & Analyzed. 09 -Jun -00 <br />Benzene <br />159 <br />0 so uga <br />200 ND 795 70-130 <br />TOhtrnte <br />172 <br />050 <br />200 ND 860 70-130 <br />phY%- <br />192 <br />050 <br />200 ND 960 70-130 <br />xviena (toud) <br />574 <br />050 <br />600 ND 957 70-130 <br />Smrovw aaa-Priluorotoluene <br />268 <br />300 893 70-130 <br />Matra Spike Dup (OF09001-MSDI) <br />Source W005776-02 <br />Prepared & Analyzed. 09 -Jun -00 <br />Benzene <br />171 <br />050 ug/1 <br />200 ND 85 5 70-130 <br />727 20 <br />Toluene <br />177 <br />050 <br />200 ND 88 5 70-130 <br />297 20 <br />Ethylbamene <br />195 <br />030 <br />20 0 ND 975 70430 <br />153 20 <br />Xylenes (total) <br />578 <br />0 50 <br />60 0 ND 96 3 70-130 <br />0 694 20 <br />Surrogate aaa-Tnffluorololuene 255 11 300 850 70-130 <br />Sequoia Analytical - Walnut Creek The results to this report apply to the samples analyzed in accordance with the chain of <br />0 custody document Vus analytical report must be reproduced in its entnrety <br />Page 3 of 4 <br />