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-- TUTTLE APPLEGATE, INC. Consultants for Land and Resource Development John Hickman Mobile Premix August 3, 1990 Page 2 The First Creek channel and Bull Seep relocation could be moved to the east 200 feet as requested with no technical impact to the channel or river system. 11. The report should have stated that there would be two lakes created by the mining. If the existing lake is not used for recharge, the cone of depression would change, however, the impact should not be too significant in terms of the number of additional well owners that would be affected. The eastern boundary of the cone would be more uniform than originally calculated. There would be no increase in the impact to the north, south or west. A copy of the revised groundwater map is enclosed which shows the revised estimate of the impact zone. 12. The volume of groundwater entering the pit is estimated based on field observations of other dewatering operations along the South Platte River in the immediate vicinity. The range given accounts for some variability in the amount of pit being dewatered, the time of year, the river stage, etc. which can affect the amount of inflow. The values for permeabilities in the area can be found in Table 1 of the report on groundwater impacts. 13. If additional wells are impacted, they would be handled in the same manner as all wells in the vicinity. All data collected would be submitted in the annual report as requested. 14. A considerable portion of the work involved in constructing these structures will be handled in the earth moving costs that are covered in other parts of the bond. The major pay items that would be involved would be some minor additional excavation, rock riprap and filter blankets and concrete. The following costs for the hydraulic structures are proposed as part of the reclamation costs: