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-~ <br />when the data sufficiency relative to those stresses is not adequate. For the <br />subject model; the operation of many local wells and the potential existence of - <br />other stresses on the system that would be very difficult fo define render the <br />- choice of an engineering calculation model appropriate. The impacts from mine <br />dewatering can be assessed sepazate from any local drawdown impacts from well- <br />pumping that can vary from day to day and season to season. <br />- , - - - _ To create the conceptual model prior.to actual model layout and construction, data <br />is needed on such things as aquifer extent and boundaries, aquifer characteristics <br />- (depth, transmissivity, ambient water levels [heads]; etc.), general flow patterns <br />and any important local stresses that must be included, such as stream systems <br />which can act as recharge or discharge boundaries. For the subject study, the <br />primary source of data was the recently published report by the United States <br />Geological Survey ("USGS"), entitled "Geohydrology of the Shallow Aquifers in <br />the Fort Lupton-Gilcrest Area, Colorado"; Hydrologic Investigations Atlas HA- <br />746C; by Robson, Heiny and Arnold; 2000. As this publications coverage does <br />not extend faz enough southwazd to allow for adequate model sizing, an older <br />publication, USGS water supply paper 1658 entitled "Groundwater Resources of <br />the South Platte River Basin in Western Adams and Southwestern Weld Counties, <br />Colorado" by Smith, Schneider and Petri was used to provide aquifer data for the <br />southern 20 percent or so of the model domain. <br />4 <br />Martin acrd Wood Water Consaltants, Inc. <br />