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I I. I I I I I I I Ie I I I I I I I. I I An economic analysis of the Arapahoe aquifer in the northern metro area is complicated by the division of the Arapahoe aquifer into the Upper Arapahoe and the Lower Arapahoe under S. B. 5. Prior to S. B. 5 Arapahoe aquifer wells were completed over the entire aquifer. Robson (1987) and Banta (1989) maintain the Arapahoe aquifer as one aquifer in their models. Therefore, regional groundwater level decline and production information in these United States Geologic Survey reports is not directly applicable to Upper and Lower Arapahoe aquifer well completions. The following Phase 2 No.1 scope of work options relate to the Arapahoe aquifer in the northern metro area. 1. Perform the economic analysis on a non-divided Arapahoe aquifer well. 2. Perform an economic analysis on a Upper Arapahoe aquifer well. 3. Perform an economic analysis on a Lower Arapahoe aquifer well. 4. Perform an economic analysis on another aquifer. Option No.1 above is described in this scope of work. This option should be considered a preliminary choice which is subject to change. Another option could be selected in Phase 2 of this study. 5.1. 1 Literature Review - Aquifer Layering Effects on Well Production A review of the published scientific literature will be performed to examine articles on the effect of layered aquifers on well production. The purpose of the literature review will be to understand previous work on aquifer layering and well production. A list of the articles reviewed will be included in the Phase 2 report. Additionally, the Literature Review report section will describe the significance of each article to groundwater production in the Denver Basin aquifers. The report should also describe any relevant conclusions. 12 HRS WATER CONSULTANTS, INC.