1990-03-27_REPORT - C1981013 (5)

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and quality parameters indicate that the water is a mixed calcium- sodium/bicarbonate type with elevated conductivities and low metals. This water has similar characteristics of Golden Eagle Mine discharge water. As mine discharge water was rerouted to Pond 002 , Well PAW-7 went dry. Data collected at the Ciruela Canyon well station (CCAW-1) is presented in Table 2-8 of Appendix 1. No data was collected at well ACAW-1. Data collected at well CCAW-1 was consistent with previous samplings (Table 2-9) . 3 . 3 Hydrologic Consequence Analysis of potential impacts associated with mining and refuse disposal have been completed and are contained in the mine permit application. Of particular concern are changes in the water quality and quantity of the Purgatoire River and side canyons within the permit and adjacent areas. Vertical permeability of the overburden on the mine property has been estimated at 0. 00021 ft/day (mine permit application) . When this low permeability is multiplied by the horizontal surface area of saturated alluvium in the area of both mines, downward flow of water is estimated at 2 . 3 gpm. With the flow measured in the Purgatoire River, this small water loss would not be detectable. This would also be true for the Purgatoire alluvium. Flows of the river will continue to replenish the amount of water lost to seepage. The effects on the side canyon drainages should be similar to the Purgatoire alluvium. Based on general geologic mapping, the alluvial area of each canyon was multiplied by the permeability, the water lost to seepage in Apache, Ciruela and Santistevan Canyons has been estimated 0. 3, 0.07 and 0. 09 gpm, respectively. In all cases, this -19-