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PAGE <br /> QUARTERLY MONITORING REPORT 7 of 58 <br /> QUARTER DATE <br /> First Quarter 2006 26-Jun-2006 <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 MW-4 has <br /> disappeared The contamination in MW-2 remains although it is decreasing overall <br /> The presence of diesel contamination in MW-2 indicates that diesel contamination is still <br /> affecting groundwater quality <br /> • The reversal of trends over the past 3 years may have resulted from the extreme <br /> changes in groundwater :�;c,.ation, 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 MWA <br /> • Water purged from MWA was black and had an odor and sheen <br /> • 642 MW-2 <br /> • The water purged from MW-2 has visible floating product but is otherwise clear The <br /> well is in good condition <br /> 643 MW-3 <br /> • MW-3's purged water is clear and free from any floating product The well is in good <br /> condition <br /> 644 MW-4 <br /> • Water purged from MW-4 is cloudy with an odor The well is in good condition <br /> 65 Management of Purge Water <br /> 6 5 1 Water purged from MW-1, MW-3 and MW-4 as well as decontamination water was <br /> removed from site 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 /> CONFIDENTIAL <br />