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<br />000610 <br /> <br />. <br /> <br />. <br /> <br />well field area. This case indicated advantages to basing the design on <br /> <br />aquifer transmissivity. The main advantage to the case 4 arrangement, <br /> <br /> <br />totaling 100 wells, apparently is the broad cone of depression resulting <br /> <br /> <br />from pumping heavily in zones of high transmissivity. This broad cone <br /> <br /> <br />of depression results in a broad area of water salvage. <br /> <br />In April of 1975 representatives from the Bureau and the Geological <br /> <br /> <br />Survey met with Colorado State Engineer personnel in Denver to discuss <br /> <br /> <br />the technical considerations concerning the Closed Basin Division. <br /> <br /> <br />Conclusions drawn from the GS's analog and digital studies indicate that <br /> <br /> <br />the Closed Basin Division will provide the water salvage expected; <br /> <br /> <br />however, a redesign in the southern portion of the salvage areas will <br /> <br /> <br />probably be required. <br /> <br />We are informed that a congressional write-in is probable in fisca~ year <br /> <br /> <br />1976 to 'initiate preconstruction planning for this division. At the <br /> <br /> <br />April meeting discussions were generally concerned as to how we should <br /> <br />proceed with post authorization studies, The first step will be to <br />establish a series of observation wells in both the shallow and artesian <br />aquifers surrounding all salvage areas of the Closed Basin to monitor <br /> <br /> <br />the effects of the project on the water level of those aquifers. A <br /> <br /> <br />large number of wells which would be suitable for observation of project <br /> <br /> <br />effects are presently available in the shallow aquifer; however, we <br /> <br /> <br />expect to have to drill most of the observation wells in the artesian to <br /> <br /> <br />assure that the project is not affecting the artesian. We expect to <br /> <br /> <br />contract for drilling and equipping this observation well network. We <br /> <br />8 <br />