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270 South 15th Street <br /> Canon City, CO 81212 ���+c�"�n <br /> November 2, 2021 <br /> 6.►C V LJ <br /> Eric Scott i��R � 5 2022 <br /> Division of Reclamation, Mining and Safety DIVISIO�1 JF �iECLAMATION, <br /> 1313 Sherman St., Room 215 f�itv"!�G � �',r';�TY-NH�IERq�,S <br /> Denver,CO 80203 <br /> Re: Black Obsidian Pit, Permit M-1987-026,Conversion CN-01, Responses to Second Adequacy <br /> Review Letter <br /> Dear Mr.Scott, ' <br /> We have prepared the following responses tp your second adequacy review letter,dated October 14, <br /> 2021, and have arranged them below in the same numbered order as appeared in your tetter. <br /> 1. Colorado Quarries Inc. (CQI) chooses'ioption B for this conversion application. We have tried <br /> throughout the initial conversion application and the first adequacy response to make clear that <br /> we have no intention of carrying out any mining activity north of the powerlines, and to restrict <br /> our activities, under the current conversion application,to the area south of the powerlines. <br /> More specifically,there will be no disturbance anywhere within 200 feet of the powerlines(both <br /> north and south). We have also stated in earlier conversion materials our understanding that <br /> CQI must apply for and be approved for any future plan to mine or disturb land in the north part <br /> of the permit area. That said, if we still must further define the area north of the 200-foot <br /> setback to the north of the powerlin�s as"unaffected area,"then that is what CQI will call it. <br /> 2. CQI does not believe that a geotechnical stability study is required for this operation,for the <br /> following reasons: CQI had a seismic shot report prepared.See enclosed.Additional information <br /> included in BLASTIN. <br /> 3. CQI acknowledges the need for a dry pit upon final reclamation. The mining plan that we have <br /> already submitted will not change:w�e will excavate material below the elevation of the crushing <br /> pad,and we will plan to backfill the stockpiled overburden material into the pit at the conclusion <br /> of mining to create a free-draining pit. A large volume of overburden will be generated when <br /> the expanded pit is begun, but we also understand that we must not excavate beyond the <br /> volume of overburden we have salvaged., so we will not mine as deep as our plan previously <br /> described. Above all,CQI recognizes that it will be many years before we reach the point of <br /> needing to backfill any material at all, and that no back�lling can even occur before final <br /> reclamation begins. Therefore,even though our plan will be to backfill salvaged overburden, <br /> little to no financial warranty should be required for backfilling until we reach the point of <br /> needing any back�lling. <br /> 4. We have attached a copy of Cross-section B-B'. <br /> 5. CQI has stated that previously that it has applied for a discharge permit.We confirm it will be <br /> from CDPHE,and wil�cover stormwater runoff and dewatering. CQI also wishes to clarify that <br /> an existing detention pond area, located outside the proposed permit area,shown on maps <br />