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<br />' PIEZOMETER DATA EVALUATION: <br />' The new piezometers were monitored on a daily basis (exclud'_:g <br />Sundays) from April 6, 1994 through April 23, 1994. Measurements cf <br />the existing piezometer wells were obtained on March 11, 1994 and <br />April 6, 1994. These measurements were nearly identical to the <br />last readings reported in the Phase I analysis. The only two <br />original wells which appear to measure true pore pressure <br />conditions within the pile corresponding to pressures indicated by <br />' recently installed piezometers are P-1 and P1-T1, which are <br />duplicated by (new) piezometers 101 and 102. This, along with the <br />fact that piezometric levels at each location vary widely wit`, <br />' depth, confirms the suspicion expressed in the Phase i <br />investigation report, that, in most cases, the water leve'_s <br />measured in the open wells type piezometers reflects a composite o` <br />different pressures from various depths, and that, even .. <br />' situations where the waver levels in these wells do reflect actual <br />pressures, the depth at which those pressures occur cannot be <br />determined. Thus, the results of existing piezometer measurements <br />' are not considered in the present analysis. The evaluatior. of <br />piezometer series 100 and 300 information represents conditions <br />occurring within the pile through a single section near the center <br />' (of the pile), which was referred to as critical section C-C in the <br />Phase I analysis. This section designation will continue to be <br />used here, in subsequent discussions. Piezometer series 200 and <br />400 information represents conditions occurring within the pile <br />through a section near the southern end of the pile. This section <br />was and will continue to be referred to as critical section A-A. <br />During the monitoring time interval noted above several sma'_: <br />' adjustments in nearly all piezometric surfaces have been observed <br />as well as two rather large adjustments in piezometers 306, 401, <br />402 n 403. These rather large adjustments in piezometric surfaces <br />within the pile as well as other less pronounced adjustments <br />' suggest that dynamic networks of water bearing conduits combined <br />with horizontal boundaries exist. These suspected networks appear <br />to open and silt closed as the pore water seeks a path o: least <br />' resistance. <br />i:IT°RNAL PORE [4AT°_R FLOW AND PRESSURE CHARACT°RISTICS: <br />' The sampling information from the drill holes as well as tha <br />p~e~ometer measurements have provided a much clearer picture of the <br />characteristics of the pile which result _.. the piezometric <br />' conditions observed. As was discussed in the Phase I investigation <br />report, the explanation for the erratic nature of water levels <br />measured in the original wells seemed, at that time, to be that <br />' flow through the pile was controlled by a layered system o: <br />relative aquifers and aquitards. However, there were so,,,e <br />conditions observed which were difficult to explain in terms of <br />' such a system, such as closely spaced wells terminating at <br />approximately the same depth, but exhibiting differing piezometric <br />levels. A review of the process followed in generating and placing <br />the refuse material was beneficial and is summarized below: <br />' 14 <br />