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SAP <br />KURTZ RANCH SAND AND GRAVEL MINE <br />GROUNDWATER MITIGATION STRATEGY <br />9/5/02 <br />Proposed language for new Development Standard: <br />The Operator shall implement the following groundwater monitoring and mitigation <br />program to address well impacts potentially caused by the Use by Special Review <br />activities in the zone of hydrologic influence of the subject site. <br />Preemptive Measures <br />The Operator will continuously and consistently apply fhe following preemptive <br />measures at the USR-1347 operatlon: <br />1. Through partitioning of mining cells into mining sub-areas, no more than 40 acres <br />of groundwater surface area will be exposed or dewatered at any one time. Pit <br />depths will not exceed 25 feet, limiting the propagation of a cone of depression. <br />2. Concurrent reclamation will reduce exposed area and prevent delays in <br />completion of reclamation that would extend periods of dewatering beyond that <br />absolutely necessary for efficient aggregate mining. The Operator will not <br />engage in the concurrent mining below groundwater of two or more mining cells. <br />3. Timing of mining operations will minimize overlapping dewatering operations in <br />the vicinity of other sand end gravel operations. The first Phase of USR-1347 <br />mining will be at the far northern end of the USR-1347 site, and Phase 4 <br />dewatering (at the southwest Corner) will not be Initiated prior to the cessation of <br />dewatering operations at USR•1219, immediately across Highway 86. <br />Monitoring Program <br />The operator will participate in andlor establish a Well monitoring program to <br />effectively determine the impacts of dewatering on potentially affected well owners. <br />The monitoring program will establish a baseline condition that identifies <br />seasonal and climatic influences, as well as the effects of other sand and gravel <br />operations. <br />The monitoring program wit! be of sufficient extent and frequency to make <br />reasonable and accurate inferences about the impacts of dewatering the USR- <br />1347 site (see attached map showing location of oN-site monitoring wells). <br />3. Monitoring data will be collected twice a year, in the spring and fall when <br />irrigation wells are not operating, and the information collected made available to <br />potentially affected parties. However, monitoring data will be collected monthly <br />