2020-06-30_REVISION - M2018037 - Laserfiche WebLink

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Civil Resources LLC July 30, 2020 Page 2 of 3 elevations before initiating work on-site that will impact groundwater levels in the area(installation of slurry walls, dewatering, etc). This baseline data will evaluated in the event that groundwater level mitigation is required. Why is no data available for the monitoring well WWTPMW 1 located in the proposed amendment area? The groundwater monitoring and mitigation plan as submitted states that if trigger levels within the existing wells are exceeded(excess of 2ft deviation from historic background levels), or if a complaint of off-site impact is received,the permittee will take action and notify DRMS within 30 days. In the event that trigger levels are exceeded, or complaints of off-site groundwater impacts are received,please commit to notifying DBMS within 5 working days. The provided notice shall include, at a minimum, a description of the issue observed or reported(excessive mounding or shadowing, off site impact, etc),additional data to be gathered by the permittee to characterize the issue if needed,and possible corrective actions that may be implemented to resolve the issue if deemed necessary. EXHIBIT L-Reclamation Costs(Rule 6.4.12): All information necessary to calculate the costs of reclamation must be submitted and broken down into the various major phases of reclamation. You must provide sufficient information to calculate the cost of reclamation that would be incurred by the state. DBMS will further evaluate the provided reclamation costs when all other adequacy issues have been resolved. At this time the Division asks that you separate out and detail the design and costs for the individual inlet/outlet structures(the NE spillway appears to differ significantly from the others)and for the individual slurry walls to be installed. EXHIBIT S-Permanent Man-Made Structures (Rule 6.4.19): Please note that roadways and above-ground or underground utilities (if present)within 200 feet of the proposed affected area are considered permanent man-made structures. In accordance with Rule 6.4.19,when mining operations will adversely affect the stability of any significant,valuable and permanent man-made structure located within 200 feet of the affected area,the applicant may either: (a) Provide a notarized agreement between the applicant and the person(s)having an interest in the structure, that the applicant is to provide compensation for any damage to the structure; or (b) Where such an agreement cannot be reached,the applicant shall provide an appropriate engineering evaluation that demonstrates that such structure shall not be damaged by activities occurring at the mining operation; or (c) Where such structure is a utility,the Applicant may supply a notarized letter, on utility letterhead, from the owner(s)of the utility that the mining and reclamation activities,as proposed,will have"no negative effect" on their utility. Please provide evidence(such as proof of delivery of certified letter to structure owners)that a notarized agreement between the structure owners and the applicant was pursued. If an agreement is unable to be reached a geotechnical assessment may be provided to demonstrate that the structures shall not be damaged. You must provide information sufficient to demonstrate that the stability of any structures located within two hundred(200)feet of the operation or affected land will not be adversely affected. DBMS notes that a stability assessment was conducted for the proposed amendment area,however,that assessment states that it did not consider additional loading from topsoil or overburden stockpiles that may be placed adjacent to