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i12 December 2001 <br />' AGE-NC Project No 98-0452 <br /> Page 3 of 4 <br />' 3 2 ANALYTICAL METHODS <br /> The ground water samples were transported to McCampbell Analytical Inc (MAI), a California <br />' Department of Health Services (DHS)-certified laboratory, for analysis The four grab ground water <br /> samples were analyzed for fuel oxygenates - MTBE, di-isopropyl ether (DIPS), ethyl tertiary-butyl <br /> ether (ETBE), tertiary-amyl methyl ether(TAME), and tertiary butanol (TBA) in accordance with <br />' EPA Method 8260 Modified <br /> r4.0. FINDINGS <br /> I The hydrocarbon impact to ground water was inferred from laboratory analysis of grab groundwater <br /> samples <br /> 4 1 ANALYTICAL RESULTS OF GROUND WATER SAMPLE <br /> Sample P1-Hz0/10-10-01 contained MTBE at a concentration of 2 7 micrograms per liter (deg/1) <br /> MTBE was not detected above laboratory reporting limits in the ground water samples collected <br /> from P-2, P-3 and P-4 <br /> The analytical results of the ground water samples are summarized in Table 1 The laboratory report <br /> (MAT Lab IDs 80534 through 80537) and chain-of-custody form are included in Appendix A <br /> 5.0. DISCUSSION <br />' The concentration of MTBE in ab groundwater sample P1-H 0110-10-01 2 7 1 is below the <br /> �' g p a ( µl�} <br /> DHS Secondary Maximum Contaminant Level of 5 µg/1, MTBE was not detected above laboratory <br /> reporting lin-nts in the other three ground water samples collected during the October 2001 <br /> investigation The MTBE plume does not appear to extend north or east of the ground water <br /> monitoring well network Figure 3 illustrates the lateral extent of MTBE in ground water at the site <br /> Based on the results of this phase of site assessment, an apparent source could not be determined for <br /> the MTBE concentrations detected in quarterly groundwater monitoring samples The ground water <br /> sample collected from boring P-3, located adjacent to the above ground gasoline storage tanks <br /> (ASTs),didnot contain concentrations ofMTBE or other fuel oxygenates above laboratory reporting <br /> • limits, indicating the AST is not a likely source for the persistent presence of MTBE <br /> I <br /> Advanced GeoEnvironmentai,Inc <br />