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<br />1999. Current rates are approximately 16 gpm. The higher than normal pumping rate from the <br />Phase H LVSCS and the near surface saturation may have resulted in to a condition where the <br />infiltration of Phase II LVSCS water was reduced, causing the water to pond. <br />The primary reason for this conclusion is the pH of 8.3 S.U. of the ponded water measured on <br />September 4'". The pH value of the ponded water was characteristic of the LVSCS and not the <br />HVSCS water, which typically ranges from 10.0 to 10.4. <br />The pump No. 4 and No. 5 transducer readings for the Phase II HVSCS on September 3"' indicate <br />that the water level was well below the surface. The Phase II HVSCS water levels were measured <br />at 43.5 feet and 44.5 feet for pumps No. 4 and No. 5, respectively. Recent and previous <br />calibrations of the transducers indicate that these water levels are real and that the transducers are <br />reading accurately. These water levels would correspond with a water elevation that is 9.5 and 8.5 <br />ft below the surface of [he Phase R HVSCS for pump No. 4 and 5, respectively. <br />CC&V is evaluating the merits of installing two shallow piezometers within the Phase II HVSCS <br />to measure water levels outside of the pump caissons on a temporary basis. The installation of <br />these piezometers would allow CC&V to better understand the water level fluctuations in this <br />area and will provide a profile of the water levels across a portion of the HVSCS. <br />If you have any questions, do not hesitate to contact me at 719-689-4041. <br />Sincerely, <br />~ ~.~ <br />Scott A. Lewis <br />Manager, Environmental Affairs <br />