Todd Keay

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 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.

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 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 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, construction, and testing at hydrologic test wells DHRES-12 and DHRES-13. Borehole DHRES-12 was drilled to characterize hydrogeologic conditions in the deep groundwater system in Cross Canyon, west of the Apache Leap escarpment, and to provide a monitoring location for the deep groundwater system during ongoing dewatering operations. DHRES-12 was abandoned prior to completion due to lost circulation and borehole instability. Well DHRES-13 was drilled at the same site to replace abandoned borehole DHRES-12.

This technical memorandum was prepared to summarize results of drilling, construction, and testing at hydrologic test well DHRES-09. The well was installed to characterize hydrogeologic conditions in the deep groundwater system west of the Concentrator Fault and east of the Main Fault, and to provide a monitoring point for the deep groundwater system during on-going dewatering operations. Monitoring data obtained from DHRES-09 have been incorporated into the RCM hydrologic monitoring program.

This technical memorandum was prepared to summarize results of drilling, construction, equipping, and testing at hydrologic test wells DHRES-03, DHRES-04, and DHRES-05/DHRES-05B. The wells were installed to characterize hydrogeologic conditions in the Gila Conglomerate and Apache Leaf Tuff west of the Concentrator Fault in the vicinity of West Plant site and to provide monitoring locations for the aquifer west of the Concentrator Fault during dewatering operations in 2010 and 2011.