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C A M B R I A <br /> at concentrations ranging from 10 6 to 154 ppb Monitoring well MW-5 was ND for <br /> TPPH, benzene and MTBE Methanol was not detected in any of the groundwater <br /> samples <br /> Quarterly Sampling <br /> Monitoring wells MW-1 through MW-7 and VEW-2 were sampled and analyzed for total <br /> purgeable petroleum hydrocarbons quantitated as gasoline (TPPH) and methanol according to <br /> EPA Method 8015 (Modified), benzene, toluene, ethylbenzene, xylenes (BTEX) and methyl- <br /> tertiary-butyl-ether (MTBE) according to EPA Method 8020, and tertiary-butanol, MTBE, <br /> di-isopropyl ether (DIPE), ethyl-tertiary-butyl ether (ETBE), and tertiary-amyl-methyl <br /> ether (TAME) by EPA Method 8260 <br /> Field monitoring data and chemical analytical data are presented in a summary table in <br /> Blaine's groundwater monitoring report (Appendix A) <br /> Conclusions <br /> Groundwater samples collected from the wells this quarter had concentrations of petroleum <br /> hydrocarbons and MTBE consistent with historical ao� for this site <br /> Methanol and ethanol have not been detected in any of the site wells Fuel oxygenates other <br /> than MTBE have not been detected in the site wells with the exception of DIPE in wells <br /> MW-1 and MW-4 DIPS concentrations in these wells have been below 21 ppb and have not <br /> been detected since the fourth quarter of 1998 (Table 1) <br /> Recommendations <br /> Cambria recommends discontinuing methanol and ethanol analysts in all monitoring wells at <br /> this site and analyzing groundwater samples for fuel oxygenate (by EPA Method 8260) in all <br /> monitoring wells once a year Cambria recommends continued MTBE analysts by EPA <br /> Method 8020 in all monitoring wells Unless notified otherwise by your office, we will <br /> implement these changes during the fourth quarter of 1999 <br /> i <br /> 241-0854 2 <br />