Todd Keay

This technical memorandum has been prepared to summarize the results of drilling, construction, and testing at hydrologic test wells HRES-14 and HRES-15. The wells were installed to characterize hydrogeologic conditions in the Apache Leap Tuff on the east side of Devils Canyon, near the Devils Canyon Fault. Monitoring data obtained from HRES-14 and HRES-15 have been incorporated into the RCM hydrologic monitoring program.

This technical memorandum was prepared to summarize results of drilling, construction, and testing at hydrologic test well HRES-13. The well was installed to characterize hydrogeologic conditions and provide a monitoring location in the western part of the Apache Leap Tuff (ALT) aquifer. Monitoring data obtained from HRES-13 have been incorporated into the RCM hydrologic monitoring program.

This technical memorandum has been prepared to summarize results of drilling and construction at hydrologic test well DHRES-14. DHRES-14 is located east of Devils Canyon, between the Devils Canyon Fault and JI Ranch Fault. The well was installed to characterize hydrogeologic conditions and provide a monitoring location in the Tertiary Whitetail Conglomerate and Precambrian Pinal Schist. Monitoring data obtained from DHRES-14 will be incorporated into the RCM hydrologic monitoring program.

This technical memorandum has been prepared to document results and analysis of a 23-day aquifer test conducted at hydrologic test well HRES-09. M&A conducted the long-term test to provide aquifer parameters for the Apache Leap Tuff (ALT) aquifer in the area of the well.

This technical memorandum was prepared to summarize results of drilling and construction at hydrologic test wells PHRES-01, PHRES-02, PHRES-03, and PHRES-04. The wells were installed to provide observation wells during the long-term pumping test at well HRES-09, and to provide locations for characterization of fracture distribution and hydraulic conductivity in the Apache Leap Tuff (ALT) aquifer in the vicinity of hydrologic test well HRES-09.

Email from Todd Keay, Montgomery Associates, describing historical mine dewatering operations.

This table summarizes hydraulic conductivity estimates from testing of wells and boreholes during hydrologic characterization activities conducted by Montgomery & Associates (M&A) during the period 2004 through 2012. To date, results of hydraulic testing and analysis have been provided in individual reports or technical memoranda for wells or groups of wells completed over the course of the 8 year period from 2004 to 2012.

This technical memorandum was prepared to provide an interim summary of data collected at wells DHRES-01 and DHRES-02. Deep hydrogeologic test wells DHRES-01 and DHRES-02 were drilled and constructed during the period May 2 to September 10, 2008. In order to measure hydraulic heads at specific elevations in the Apache Leap Tuff (Tal) and Whitetail Conglomerate (Tw), vibrating-wire pressure transducers were grouted in the annulus between the borehole wall and conductor casing at wells DHRES-01 and DHRES-02.

This technical memorandum was prepared to document results and analysis of a 60-day pumping test conducted at hydrologic test well HRES-07.

This technical memorandum was prepared to summarize results of drilling, construction, equipping, and testing at hydrologic test well DHRES-06. The well was installed to characterize hydrogeologic conditions in the deep groundwater system south of the South Boundary Fault and to provide a monitoring point for the deep groundwater system during dewatering of existing mine workings. Monitoring data obtained from DHRES-06 will be incorporated into the RCM hydrologic monitoring program.