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819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> / 1 Se[�L101a X9161921-9600 <br /> FAX(916)921-0100 <br /> Analytical www.scquoialabs.com <br /> URS-Sac,Gateway Oaks Project: ARCO 5450,Stockton,CA <br /> Project Number: 5450,Stockton,CA Reported: j <br /> 2870 Gateway Oaks Dr.,Ste.300 09/04/02 11:19 <br /> Sacramento CA,95833 Project Manager. Vernon Elarth <br /> Total Purgeable Hydrocarbons by DHS LUFT -Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %uREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2090001-EPA 5030B PIT <br /> Blank(2090001-BLK1) Prepared&Analyzed:08/30/02 <br /> Purgeable Hydrocarbons ND 0.50 mg/kg <br /> Surrogate:a,a,a-Trifluorololuene 0.0196 0.0200 98 60-140 <br /> LCS(2090001-BS1) Prepared&Analyzed:08/30/02 <br /> Purgeable Hydrocarbons 0.971 0.50 mglkg 1.00 97 70-130 <br /> Surrogate:a,a,o-Trifluorotoluene 0.0147 „ 0.0200 124 60-140 <br /> Matrix Spike(2090001-MSI) Source:S208391-01 Prepared&Analyzed:08/30/02 <br /> Purgeable Hydrocarbons 0.938 0.50 mglkg 1.00 ND 87 60-140 <br /> Surrogate:a,a,a-Trifluorololuene 0.0151 „ 0.0200 126 60-140 <br /> Matrix Spike Dup(2090001-MSD1) Source:S208391-01 Prepared&Analyzed:08/30/02 <br /> Purgeable Hydrocarbons 0.974 0.50 mg/kg 1.00 ND 90 60-140 4 25 <br /> �u—gate:a,a,a-Trifluorotoluene 0.0253 0.0200 126 60-140 <br /> Sequoia Analytical-Sacramento 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 Page 6 of 9 <br />