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6 <br /> The presence of diesel contamination in MW- indicates that diesel contamination is still <br /> affecting groundwater quality(Figure 6) <br /> The reversal of trends over the past 3 years may have resulted from the extreme changes in <br /> groundwater elevation,this is illustrated in Figure 9 <br /> 6 2 Data Anomalies <br /> No data anomalies were found during this quarter's sampling <br /> 6 3 Variations from Sampling Procedures <br /> Field testing for natural attenuation indicators of groundwater samples, including pH, <br /> conductivity,and temperature,was conducted this quarter <br /> 64 Well Conditions and Appearance of Purged Water <br /> 6 4 1 MW-1 <br /> Water purged from MW-1 has a slight hydrocarbon odor The seal at grade has been <br /> deteriorating since installation due to the large number of trucks that pass over it daily The <br /> well cap was replaced this quarter <br /> 6 4 2 MW-2 <br /> . The water purged from MW-2 has visible floating product but is otherwise clear The seal at <br /> grade and the well cap are deteriorating <br /> 6 4 3 MW-3 <br /> MW-3's purged water is cloudy and free from any floating product The well cap was replaced <br /> this quarter <br /> 6 4 4 MW-4 <br /> Water purged from MW-4 is silty with a strong hydrocarbon odor The well is in good <br /> condition <br /> 6 5 Management of Purge Water <br /> Water purged from MW-1, MW-3 and MW-4 as well as decontamination water was placed in <br /> an on-site 55-gallon drum and labeled <br /> 6 6 Recommendations <br /> El recommends <br /> ■ Continued removal of floating oil from MW-2 every quarter until motor oils no longer <br /> appear <br /> ■ Continued quarterly monitoring of the four groundwater monitoring wells at CTL to <br /> 0 5 <br /> 7166 <br />