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� AMBRIA <br /> Conclusions <br /> The petroleum hydrocarbon and MTBE concentrations in groundwater samples collected <br /> from the shallow wells this quarter are within the historical norm for this site Wells MW-5, <br /> MW-8, and RW-lA continue to contain the highest levels of hydrocarbons and MTBE <br /> However, analytical data from offsjte wells suggests the hydrocarbons and MTBE detected <br /> onsite wells (MW-5, MW-8, and RW-IA) is remaining onsite <br /> Groundwater samples from the CalTrans irrigation well and the private water wells did not <br /> contain petroleum hydrocarbons and fuel oxygenates this quarter We will continue quarterly <br /> groundwater sampling and analysis to confirm the presence or absence of MTBE in these <br /> wells <br /> Methanol was not detected in wells MW-2 through MW-4, MW-6, MW-7, and MW-9 <br /> through MW-14 this quarter and has not been detected in these wells since sampling was <br /> initiated (September or December 1997) Oxygenates other than MTBE were not detected in <br /> wells MW-2 through MW-4, MW-6, and MW-12 through MW-14 this quarter and have not <br /> . been detected in these wells since sampling began, with the exception of one ethanol <br /> detection in MW-12 during December 1997 <br /> Recommendations <br /> Cambria recommends that methanol analysis be discontinued in wells MW-2 through MW-4, <br /> MW-6, MW-7, and MW-9 through MW-14 since it has not been detected in these wells since <br /> sampling was initiated We also recommends discontinuing fuel oxygenate analysis in wells <br /> MW-2 through MW-4, MW-6, and MW-12 through MW-14 since they have not been <br /> detected since sampling began (with one exception, mentioned above) We will continue to <br /> analyze for MTBE by EPA Method 8020 Cambria will implement these changes during the <br /> first quarter 2000 sampling event unless we are notified otherwise by your office <br /> Cambria will continue to monitor the groundwater analytical data from the monitoring wells <br /> at this site to determine if additional plume delineation is necessary If additional <br /> investigative work is warranted in the future, we will make recommendations for this work <br /> 241-4783 3 <br />