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W 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 4 <br /> ' 6.2 Data Anomalies i <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 i <br /> 6.4 Well Conditions and Appearance of Purged Water <br /> � 6.4.1 MW-1 <br /> 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 Also, ! <br /> the well cap needs replacement <br /> 6.4.2 MW-2 <br /> The water purged from MW-2 has visible floating product but is otherwise clear As with MW- <br /> i1,the seal at grade and the well cap are deteriorating <br /> I 6.4 3 MW-3 <br /> ' • MW-3's purged water is cloudy and free from any floating product The well cap needs <br /> r replacement <br /> i <br /> 6.4.4 MW-4 <br /> Water purged from MW4 is silty with a slight 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 MW4 as well as decontamination water was placed in ; <br /> an on-site 55-gallon drum and labeled <br /> 6.6 Recommendations <br /> 1 � , <br /> i El recommends <br /> Continued removal of floating oil from MW-2 every four weeks until motor oils no E <br /> longer appear <br /> ■ Continued quarterly monitoring of the four groundwater monitoring wells at CTL to <br /> accumulate data as a basis for future actions, or to show when contamination levels <br /> have dropped to insignificant levels <br /> 01 11 <br /> • Replace the seal at the grade of MW-1 <br /> 5 , <br />