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' D. Stone Column Pumping <br />t Stone column pumping commenced during Mazch 2006. Pumping data for the permanent pumps <br />located in SC-49, SC-50, SC-51 and SC-68 is presented in Appendix A. A total of 157,518 gallons <br />were pumped from these wells in 2006. <br />In addition to the permanent pumps, temporary pumps were also installed in SC-20, SC-22, SC-23 <br />and SC-29. Pumping data for these temporary pumps is located in Appendix A. <br />A summary of the pumping data is presented in Table 1. <br /> <br />Table 1. Summary of 2006 Pumping Data <br />Stone <br />Column <br />ID Total <br />Gallons <br />Pumped <br />2006 Decrease <br />in <br />Ground <br />Water <br />Level (ft) <br />SC-49 61,554 20 <br />SC-50 24,329 30 <br />SC-51 5,526 35 <br />SC-68 66,119 60 <br />SC-20 706 5 <br />SC-22 928 12 <br />SC-23 213 40 <br />SC-29 12,415 5 <br />The pumping of stone columns SC20 through SC23 correlate with a reduction in the ground water <br />table by 4 ft measured in piezometer B-5 (located approximately 10 feet to the south). The effects <br />of the pumping aze not seen in any other piezometers onsite. <br />' The pumping of stone columns SC49-51 may have contributed to a reduction in the ground water <br />table by a couple of feet in piezometer 02-07 located approximately 40 feet to the west. The effects <br />of the pumping aze not seen in any other piezometers onsite. <br />Barr Engineering Company 2n0 Quarter 2006 <br />' 06/26-031 Geotechnipl Monitoring <br />