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7 <br /> Mr. Norris said he is still not clear about the position of VDOT and the Corps <br />regarding the at-grade versus grade-separated interchange, and asked that the City’s <br />position be reiterated. <br /> <br /> Ms. Tucker said she can compile a paper trail on the interchange issue. <br /> <br />REPORT <br />: WATER ISSUES UPDATE (RIVANNA WATER AND SEWER <br />AUTHORITY) <br /> <br /> Mr. Tom Frederick, Executive Director of Rivanna Water and Sewer Authority, <br />said that City staff had suggested that he give quarterly updates to Council on activities <br />by RWSA. He said a new designer has been hired for the Ragged Mountain dam and <br />geophysical work is being done. He said we can get a ballpark estimate for reducing the <br />size of the new dam. He said the consultant is reluctant to give an estimate without <br />additional study to expand the existing dam, but they think it would cost considerably <br />more to do that than build a new dam. <br /> <br /> Mr. Norris asked why the discrepancy in the estimates by the former and current <br />consultant regarding the cost of expanding the existing dam versus building a new dam, <br />and Mr. Frederick said he does not know. He said that the former consultant did later say <br />that additional study would be needed regarding the feasibility of expanding the existing <br />dam. <br /> <br /> Mr. Frederick said the second major project concerns the relationship between the <br />size of a new pipeline and storage in the reservoirs. He said it has been concluded that <br />the pipe size would help replenish the water supply during a drought, but would not help <br />to increase storage. <br /> <br /> Responding to a question from Mr. Norris about whether the water demand being <br />considered is the same as in the water plan, and Mr. Frederick said that a different model <br />was used using restricted voluntary conservation and mandatory conservation. He said <br />demand decreased 20% during a drought emergency. <br /> <br /> Mr. Norris said he believes we can realistically plan for lower consumption than <br />envisioned in the plan, and if that is correct, we can reduce the average flow needed. <br /> <br /> Mr. Frederick said that is correct, but he said he would be cautious about saying <br />the demand will continue to go down. <br /> <br /> Mr. Frederick said the water conservation study has been completed, and Mr. <br />Norris said he believes it is still a work in progress. <br /> <br /> Mr. Frederick said a conceptual review of pipeline routes will be completed in <br />December, including the cost of land acquisition. He noted that Council will be <br />discussing the dredging study later in the meeting. He said the belief is that staff can <br />provide a statement on the pros and cons of the three pipelines. <br /> <br /> Mr. Norris asked if staff can estimate the cost of replacing the Sugar Hollow <br />pipeline, and Mr. Frederick said staff can identify lengths of the pipeline. <br /> <br /> Mr. Norris said he would like to get a ballpark estimate on various pipelines. <br /> <br /> Dr. Brown said if we want good estimates, considerable work will be needed. He <br />asked what we could get and what would it cost to get. <br /> <br /> Mr. Norris asked about the process for exploring the cost of the I-64 piece of the <br />project. <br /> <br /> Mr. Frederick said proposals are being made for the consultant. He said it will be <br />challenging to get that cost estimate. <br /> <br /> <br />