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1551] al Road <br /> Sequoia San Carlos <br /> rmsCA 94070 <br /> a- ) (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www,sequoialabs.com <br /> Gettler-Ryan/Geostrategies(1) Project: Tosco(1) <br /> 6747 Sierra Court,Suite I Project Number: Tosco#11195,Lathrop,CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 12/10/01 19:11 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 8021B - Quality Control <br /> Sequoia Analytical -_San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Leel Result %REC Limits RPD Limit Notes <br /> Batch 1120009-EPA 5030B(P/T) <br /> Blank(1120009-BLKI) Prepared&Analyzed: 12/04/01 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 5.0 " <br /> Surrogate:a,a,a-Trifluorotoluene 8.69 10.0 86.9 70-130 <br /> LCS(I 120009-BSI) Prepared&Analyzed: 12/04/01 <br /> Benzene 9,68 0.50 ug/l 10.0 96.8 70-130 <br /> Toluene 9.61 0.50 10.0 96.1 70-130 <br /> Ethylbenzene 9.52 0.50 10.0 95.2 70-130 <br /> Xylenes(total) 28.9 0.50 30.0 96.3 70-130 <br /> Surrogate:a,a,a-Trtfluorotoluene 9.84 10.0 98.4 70-130 <br /> LCS(1720009-BS2) Prepared&Analyzed: 12/04/01 <br /> Purgeable Hydrocarbons as Gasoline 233 50 ug/l 250 93.2 70-130 <br /> Surrogate:a,a,a-Triuorotoluene 11.0 1110.0 110 70-130 <br /> Matrix Spike(I I 20009-MS 1) Source: LI 11145-11 Prepared: 12/04/01 Analyzed: 12/05/01 <br /> Purgeable Hydrocarbons as Gasoline 271 50 ug/l 250 ND 108 60-140 <br /> Surrogate:a,a,a-Trifluorololuene 9.78 1110.0 97.8 70-130 <br /> Matrix Spike Dup(1120009-MSD1) Source: L111145-11 Prepared: 12/04/01 _Analyzed: 12/05/01 <br /> Purgeable Hydrocarbons as Gasoline 268 50 ug/l 250 ND 107 60-140 1.11 25 <br /> Surrogate:a,a,a-Trruorotoluene 11.2 10.0 112 70-130 <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain off. <br /> custody document. This analytical reporl must be reproduced in its entirety. <br /> Page 12 of 18 <br />