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q _ <br /> } .`�� '.. ��, ,„ }' ski' � „'(:•' ?f '+`'2.y.`.:�• _k� C .ki ,d <br /> S.0 CONCLUSIONS <br /> The eondusions are presented in two main components of the testing and sampling program, <br /> CPT testing and BAT groundwater sampling. <br /> 5.1 CPT DATA <br /> The CPT soil behavior type data correlated with the boring log data and provided higher <br /> resolution and more detailed data than that obtainers from the drilling program. The <br /> successful use of the CPT on geotechnical and environmental sites is well documented and <br /> it is generally acknowledged that the CPT provides this data at a significantly lower <br /> cost compared to drilling programs. <br /> The CPT pore pressure data from CPT 3 correlated well with data from MW3 but contained <br /> anomalies in the inferred depth to groundwater measurements at the remaining 4 sites. <br /> This indicates that the site hydrogeology may be more complex than that detemined from <br /> monitoring well water levels. The monitoring wells on this site are constructed with <br /> completion intervals ranging in length from approximately 13 feet to 26 feet._located at <br /> depths of 6 feet to 32 feet below ground level. These completion intervals may result in <br /> composite or averaged measurement of water levels. <br /> 5.2 BAT DATA <br /> The groundwater samples obtained from the BAT groundwater sampling probes yielded <br /> significantly lower concentrations of volatile organic compounds than the corresponding <br /> monitoring well samples. These results are due to the following factors: <br /> a) sampling protocol utilized with the BAT system involved evacuation of partially <br /> filled vials,which may have resulted in"stripping"of the sample; <br /> b) pressure within the BAT sample vials was not monitored,which may have resulted <br /> in samples containing "headspace", effeciively under vacuum, sent to the <br /> laboratory for analysis; and <br /> c) the BAT sampling probes effectively sample an interval 4 inches in length while <br /> the corresponding monitoring wells effectively sample an interval greater than <br /> 12 feet in length, therefore, a single BAT sampling probe has the potential to <br /> miss a zone of contamination intercepted by a monitoring well. <br /> 15 <br /> trr <br /> NMI MORE 11IM111 <br />