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<br />,~ <br /> <br />Woodward.Clyde Consultants <br /> <br />Mr. Keith Eberhardt <br />Colorado Water Conservation Board <br />January 8, 1991 <br />Page 2 <br /> <br />Item (4). <br /> <br />Item (5). <br /> <br />second line should read: ''The slurry wall will extend about ~ feet on <br />either side..." <br />Clarification: The cement-bentonite slurry wall described for alternative <br />one and the soil-bentonite slurry walls described for alternatives two and <br />three are different lengths. The 200 foot length of wall for alternative one <br />was chosen to provided a centerline cutoff through the major portion of <br />. the darn. The slurry wall length of 300 feet for alternative two was <br />selected to tie in with the width of the upstream clay blanket. The slurry <br />wall width of 100 feet for alternative three, the selected alternative, was <br />designed to correspond to the width of the bottom excavation. For both <br />alternatives two and three, extending the slurry wall beyond these lengths <br />would involve cutting the upstream face to accommodate the slurry wall <br />construction equipment. <br /> <br />(Referring to Section 6.0 Estimated Costs) - Errata and Clarification - <br />Attached to this letter are Tables 6-1 through 6-6 to replace Tables 6-1 <br />through 6-5. An additional table (Table 6-4) was prepared to provide an <br />itemized cost estimate for the spillway construction costs. This spillway <br />construction cost was included with the replacement cost estimate tables <br />for the three alternatives, Tables 6-1 through 6-3. In the previous tables, <br />the mobilization, construction engineering and other contingency factors <br />had not been added to the spillway construction costs. Including these <br />factors resulted in an increase in the costs of all three alternatives. <br /> <br />In Table 6-3 there was an error in the length of slurry wall and in Table <br />6-5 there was an error in the total project costs for alternative one: these <br />errors were corrected as shown on Tables 6-3 and 6-6. <br /> <br />(Referring to the Corporate Resolution and Section 8.0 Financial <br />Program) - Errata - A new corporate resolution by the Windsor Reservoir <br />and Canal Company and a revised Financial Program (Table 8-1) are <br />attached to replace the same in the report. The project costs and loan <br />amounts correspond between the financial program and corporate <br />resolution. The new financial program assumes that the Windsor <br /> <br />22539j22539.LEl Ol-ll8-91jREPORTS3(kaj) <br />