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Environmental Protection Plan-Amendment Z <br /> mitigation of potential leaching metals will naturally occur. Samples <br /> were obtained from gangue material obtained from dry portion of the May Day No. 1. In <br /> the future, Mr. Bird's memo(April 21, 2010), suggests future samples will include"acid- <br /> base accounting(ABA),including notation of the location of sample, date",and sampling <br /> method. Future Synthetic Precipitation Leaching Procedure(SPLP-SW-846)tests will be <br /> obtained(annually)on representative ore,host rock and gangue material to report the <br /> potential presence of acid-producing material,if any. <br /> 6.4.21(7) Facilities Evaluation <br /> (a) Site-Specific Conditions <br /> The mine rock neutralizing capacity will offset acid generation potential. "The(May Day— <br /> Idaho mine rock)acid base ratios demonstrate desirable natural Environmental Protection" <br /> (Bird, David-DRMS Memo February 1,2007) <br /> (b) Materials of Storage <br /> Only small quantity designated hazardous or toxic chemicals(i.e.paints,herbicides, <br /> solvents,antifreeze)will be stored in locked storage units. <br /> (c) Alterations to Naturally Occurring Geological and Geochemical Conditions <br /> The site is located at the southwest region of the La Plata Mountains,a laccolithic type <br /> mountain group produced by the domal uplift of sedimentary rocks intruded by igneous <br /> stocks,dikes and sills(Eckel, 1949).The permit area is predominately sedimentary rocks <br /> with mineralized zones in the forms of limestone replacement or porphyry veins and dikes. <br /> The existing conditions reflect historical mining activities occurring for over 100 years and <br /> alterations to the naturally occurring geological and geochemical conditions are not <br /> anticipated. <br /> Although mining has occurred in the district for over 100 years,no historical mine water <br /> quality impacts have been identified.(See Exhibit G-Water Information) The current <br /> natural conditions suggest the geochemical conditions are favorable to mitigating potential <br /> future water quality impacts. <br /> (d) Monitoring Systems <br /> Five surface water monitoring points(Exhibit-G Figure 6).will be sampled on a quarterly <br /> basis as per Section 6.4.21(12)(see also Surface Water Characterization,Wildcat Mining <br /> Corporation,2015) <br /> • LP-I LaPlata River—surface water above the May Day Idaho mine permit <br /> boundary; <br /> • LP-2 La Plata River—surface water below the May Day Idaho beaver pond; <br /> Exhibit U-EPP Amendment <br /> 112d-M-1981-185 <br /> May Day Idaho Mine Complex <br /> March 10,2017 <br /> Page 4 <br />