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l Road <br /> Sequoia am Carlos CA 94070 <br /> San Carlos CA 99070 <br /> Analytical (650)232-9610 <br /> FAX(650)232-9612 <br /> WWW sequoialabs eom <br /> Gettler-Ryan/Geostrategies(l) Project Unocal(4) <br /> 47 Sierra Court, Suite J Project Number Former Unocal#5098,Stockton Reported <br /> 'blur CA, 94568 Project Manager Deanna Harding 07/01/02 07 46 <br /> BTEX by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lunit Notes <br /> Match 2060239-EPA 5030B LP/TJ <br /> Wank(2060239-BLK1) Prepared&Analyzed 06/19/02 <br /> tyl'b="ne <br /> thyl Cert-butyl ether ND 050 ug/l <br /> nND 050 ND 050 " <br /> Toluene ND 050 " <br /> t <br /> enes(total) ND 050 1 <br /> olme(C6-C10) ND 50 <br /> Surrogate Toluene-d8 245 250 98 60-140 <br /> tagate 4-BFB 246 lo 250 98 60-140 <br /> rogate 1,2-DCA-d4 312 250 125 60-140 <br /> LCS(2060239-BS1) Prepared&Analyzed 06/19/02 <br /> thyl tent-butyl ether 116 050 ugll 109 106 60-140 <br /> izene 679 0 SO 670 101 70-130 <br /> Toluene 38 5 050 405 95 70-130 <br /> e(C6-C10) 481 50 550 87 70-130 <br /> to Toluene-d8 238 250 95 60-140 <br /> Surrogate 4-BFB 244 250 98 60-140 <br /> Jtogate <br /> 12-DCA-d4 292 250 117 60-140 <br /> rix Spike(2060239-MSI) Source 5206231-05 Prepared&Analyzed 06/19/02 <br /> Methyl tert-butyl ether 105 050 ug/1 109 ND 96 60-I40 <br /> 1zene 660 050 670 ND 99 70-130 <br /> ene 396 050 405 ND 98 70-130 <br /> Gasoline(C6-C10) 484 50 550 ND 88 60-140 <br /> agate Toluene-d8 254 250 102 60-140 <br /> agate 4-BFB 237 250 95 60-140 <br /> Surrogate 12-DCA-d4 273 250 109 60-140 <br /> e <br /> S uoia Analytical- San Carlos 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 its entirety <br /> Page 101 of 103 <br />