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to o N (:) .~ ~..::;, CHAPTER IV CONSULTATION AND COORDINATION Revised FEIS Table 13' Canal increments not included under alternatives A and B (Grand Valley Unit)2 Salinity reduction Cost Imperial effectiveness Length Rounded Dam by increment Canal (miles) (tons/year) (mQ/l) ($/ton) East End Grand Valley Mainline Canal 12.5 24,744 2.2 92 Stubb Ditch 10.2 4,300 0.4 52 Price Ditch 9.1 7,200 0.7 54 Kiefer Extension 15.4 5,944 0.5 147 Grand Valley Highline 23.5 13,428 1.2 199 Orchard Mesa Canal No. 1 16.3 3,822 0.3 211 West End Grand Valley Mainline Canal 14.0 3,378 0.3 283 Independent Ranchmens Ditch 11.8 1,132 0.1 355 Orchard Mesa Canal No.2 17.3 1.006 0.1 731 I New tonnages were estimated based upon the total tonnage contributed by increment and seepage rates before and after improvement. The seepage rate after construction of the Stubb Ditch would approach 0 since little or no seepage is anticipated from the pipeline. I Based on October 1990 pre-construction-level data at 5 5/8 percent for a 50-year time period. -Mr, Skinner asked whether cost estimates were based on traditional Reclamation contracts involving competitive bids, or are they based upon the work being completed by the irrigation districts through a contract with Reclamation, Due to the complexity of the construction associated with the improvement of the Price and Stubb Ditches, it is anticipated that these ditches will be improved through a traditional Reclamation construction contract. Tables 6 and 7 (formerly table 5, p.31; and 6, p.32) were based upon this means of construction. However, the option of having the irrigation districts construct the improvements within their systems remains viable. The net impact of the two types of construction would be quite similar on the local economy, Traditionally, with Reclamation contract construction, contractors bring in most of their machinery and some of the more skilled labor, Consequently, the economic impact of the construction can be limited since these services are not obtained locally, If the work is accomplished by the irrigation districts, all equipment and labor would most likely be obtained locally providing more economic benefit. Thus the economic impact having the irrigation district perform their own construction at a lower cost but using more local resources would be offset by using a traditional Reclamation construction contract at a higher cost and a reduced use of local resources. -Colorado Department of Highways (CDOH) requested clarification of the location of the portions of the Stubb Ditch which may be realigned. The text has been expanded to clarify that the relocations are immediately west of the Clifton Interstate-70 interchange. Additionally, design and construction activities which interface with State highways will be coordinated with 43