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E 6.3 Variations from Sampling Procedures <br /> .` Field testing for natural attenuation alndccators of groundwater samples, including pH, <br /> conductivity,and temperature,was conducted this quarter <br /> 1 <br /> 6.4 Well Conditions and Appearance of Purged Water <br /> 6 4.1 MWA <br /> Water purged from MW-1 has a slight hydrocarbon odor The seal at grade has been I <br /> deteriorating since installation due to the large number of trucks that pass over it daily Also, <br /> the well cap needs replacement <br /> y 6 4.2 MW-2 <br /> 1 f The water purged from MW-2 has visible floating product but is otherwise clear As with MW- � <br /> 1,the seal at grade and the well cap are deteriorating <br /> 6.4.3 MW-3 <br /> I <br /> I <br /> MW-3's purged water is cloudy and free from any floating product The well cap needs <br /> replacement <br /> I <br /> 6.4.4 MW-4 <br /> ' [ Water purged from MW-4 is silty with a slight hydrocarbon odor The well is in good I <br /> !� condition <br /> 6.5 Management of Purge Water <br /> f � <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 I <br /> 6.6 Recommendations <br /> El recommends I <br /> 1 <br /> ■ Continued removal of floating oil from MW-2 every four weeks until motor oils no <br /> j - longer appear <br /> I <br /> ■ Contmucd quarterly monitoring of the four groundwater monitoring wells at CTL to <br /> f accumulate data as a basis for future actions, or to show when contamination levels <br /> have dropped to insignificant levels <br /> _ Replace the seal at the grade of MW-1 I <br /> 1Y I <br /> I <br /> l <br /> • �Lu � <br /> 5 <br />