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r� <br /> Transit Mix Concrete Co. <br /> figures will be included in a revised permit submittal provided to CDRMS on or <br /> prior to July 22,2016. <br /> Potential Ground Water Impacts <br /> 165) Comment: The text states that during drilling,the only highly productive aquifer zone <br /> that was encountered was in the borehole that intercepted the Little Turkey Creek fault <br /> zone(HC001-15). The Division has determined that this aquifer system should be <br /> monitored by the operation under a groundwater monitoring program. The Division <br /> recommends the applicant begin monitoring this aquifer as soon as possible to <br /> characterize existing conditions before mining begins. Groundwater monitoring wells <br /> should be located hydrologically upgradient and downgradient from the proposed limits <br /> of disturbance. Although groundwater does not appear to have been encountered in the <br /> Deadman Creek fault zone(HC007-15),the Division will require that this potential <br /> aquifer also be monitored under the groundwater monitoring program for this operation. <br /> Response: A proposed Water Monitoring Plan is included in Exhibit G. The sites <br /> will be established and monitoring will begin upon approval of the plan by <br /> CDRMS. <br /> 166) Comment: The applicant discusses the high-angle thrust faults that separate the two <br /> geologic units, granodiorite to the west of the faults, and sandstone units to the east of the <br /> faults. The fault zone is said to effectively separate the two groundwater systems. <br /> However, further down,the text states that some of the existing wells located to the east <br /> of the quarry reportedly penetrated granitic bedrock material in addition to sandstone, <br /> indicating that there is a complex structural geology associated with the faulting. The <br /> applicant then goes on to state that groundwater flow across this complex geologic <br /> structure is limited. Please provide information to support this statement. Additionally, <br /> Figure 3 only shows one well(179279)located east of the fault zone that is reportedly <br /> completed in granite. The text"some of the existing wells"implies that there is more <br /> than one well east of the fault zone completed in granite. Are there wells present that <br /> were not included on Figure 3?If so,please revise this figure and Table I to include all <br /> wells. <br /> Response: Faulting between the granite and sedimentary rock may act as a conduit <br /> for flow parallel to the fault through brecciated areas,but the fault typically <br /> restricts flow perpendicular to the faulting. All wells with valid permits were <br /> included on Figure 3,and there is only one well east of the project area that is <br /> reported to be completed in the granite. The presence of this well indicates a <br /> structural complexity which likely suggests additional fault blocks and faulting <br /> below the ground surface that is not observed in any geologic mapping. Bishop- <br /> Brogden Associates includes a discussion of groundwater flows in the vicinity of the <br /> faults,a discussion on wells in the nearby area, and a discussion of the well in <br /> question(179279)in their response to comments memorandum included in Exhibit <br /> G. <br /> Hitch Rack Ranch Quarry(M-2016-010) <br /> Response to Comments—July 14, 2016 <br />