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r <br /> CAMBRIA <br /> • Wells S-1 and S-3 contained DIPE concentrations of 35 8 and 134 ppb, respectively <br /> Methanol was not detected In any of the wells <br /> Quarterly Sampling <br /> Groundwater samples were analyzed for total purgeable hydrocarbons as gasoline (TPHg), <br /> total petroleum hydrocarbons as diesel (TPHd) and methanol according to EPA Method <br /> 8015 (Modified), benzene, toluene, ethylbenzene, xylenes (BTEX), and methyl tertiary butyl <br /> ether (MTBE) according to EPA Method 8020, fuel oxygenates by EPA Method 8260A <br /> Field monitoring data and chemical analytical data are presented in a summary table in <br /> Blaine's groundwater monitoring report (Appendix A) Additional chemical analytical data, <br /> for fuel oxygenates, has been summarized on Table 1 <br /> Conclusions <br /> Groundwater samples collected from the monitoring wells this quarter contained petroleum <br /> hydrocarbon concentrations similar to previous quarters' concentrations Fuel oxygenates, <br /> other than MTBE, were not detected in wells S-2, S-4, S-5, and S-6 this quarter and have not <br /> been detected in these wells since analysts began in February 1998 The only fuel oxygenate, <br /> other than MTBE detected in well S-3 has been DIPE Well S-I has contained DIPE and <br /> methanol DIPE concentrations in S-I and S-3 have remained fairly constant in each well <br /> Recommendations <br /> Cambria recommends discontinuing analysis for fuel oxygenates (MTBE, TBA, DIPE, <br /> TAME, ETBE, ethanol, and methanol, by EPA Methods 8260 and 8015) in wells S-2, S-4, <br /> S-5, and S-6 in order to reduce analytical costs for this site The justification for <br /> discontinuing this analysis is that these wells have never contained fuel oxygenates with the <br /> exception of MTBE We recommend analysis for MTBE by EPA Method 8020 continue in <br /> these wells, with confirmation of MTBE by EPA Method 8260 when it is detected by EPA <br /> Method 8020 <br /> We also recommend reducing fuel oxygenate analysis in wells S-I and S-3 to once a year <br /> DIPE has been detected in both wells, but the concentrations have been fairly low and have <br /> not varied much in each well Monitoring DIPE concentrations once a year should be <br /> I� <br /> 241-0943 2 <br />