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PAGE <br /> -owk - =QUARTERLY MONITORING REPORT--- _ 7of61 <br /> QUARTER DATE <br /> Third Quarter 2005 19-Oct-2005 <br /> 2005,and now is decreasing <br /> • The former diesel USTs caused moderate contamination of the soil and groundwater <br /> adjacent to the tanks Diesel contamination was detected in MW-2(northeast of MW-1) <br /> and MW-3(southeast of MW-1)in April 2000 This was not evident in later samples until <br /> December 2001 (MW-1, MW-2 and MW-4)and March 2001 (MW-3)when contamination <br /> was detected again Since that time, the diesel contamination in MW-3 and MW4 has <br /> disappeared The contamination in MW-2 remains although it is decreasing overall <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 <br /> changes in groundwater elevation, this is illustrated in Figure 9 <br /> 62 Data Anomalies <br /> 6 2 1 No data anomalies were found during this quarter's sampling <br /> 63 Variations from Sampling Procedures <br /> 6 3 1 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 diesel odor The seal at grade that had been deteriorating <br /> since installation due to the large number of trucks that pass over it daily,was replaced in early Sept <br /> 642 MW-2 <br /> • The water purged from MW-2 has visible floating product but is otherwise clear The <br /> seal at grade and the well cap are deteriorating <br /> 643 M W-3 <br /> • MW-3's purged water is cloudy and free from any floating product <br /> 644 MW-4 <br /> • Water purged from MW-4 is cloudy with a strong hydrocarbon odor The well is in good <br /> condition <br /> 65 Management of Purge Water <br /> • Water purged from MW-1, MW-3 and MW-4 as well as decontamination water was <br /> placed in a 55-gallon drum and removed from the site by the sampling contractor for disposal <br /> 66 Recommendations <br /> 6 6 1 EI 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 /> accumulate data as a basis for future actions,or to show when contamination levels <br /> have dropped to insignificant levels <br /> I <br /> I <br /> THIS DOCUMENT AND CONTENTS ARE THE PROPERTY OF ENVIRONEERING, INC <br />