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V <br /> el ER4.9111111 Q <br /> Gagliano Engineering, Inc MEMO <br /> P.O. Box 2520 DEG' <br /> Pueblo, CO 81004 6 2018 <br /> (719) 547-7073 p'4N f �CLAA IoN <br /> t,VArETy <br /> December 19, 2018 <br /> Elliott Russell <br /> Colorado Division of Reclamation, Mining and Safety <br /> 1313 Sherman St, Room 215 <br /> Denver, CO 80203 <br /> Re: Engineering Evaluation for Rocky Ford Highline Canal structures within 200 feet <br /> 112c Construction Materials Amendment Application <br /> (AM-01) Big"G" Gravel Pit, Permit No. M-2006-081 <br /> Dear Mr. Russell, <br /> Multiple attempts have been made to contact Rocky Ford Highline Canal regarding their <br /> irrigation canal within 200 feet of the permit boundary for (AM-01) Big"G" Gravel Pit, Permit <br /> No. M-2006-081. 1 have not received a written response. Please accept this letter as our <br /> "Engineering Evaluation" based on Option "B" of the standard Structure Agreement: <br /> "Where such an agreement cannot be reached, the Applicant shall provide an appropriate <br /> engineering evaluation that demonstrates that such structure shall not be damaged by <br /> activities occurring at the mining operation" <br /> The irrigation canal is directly adjacent to and north of the northeast permit boundary of the <br /> mine. For the original permit, Rocky Ford Highline Canal provided a letter stating their <br /> concerns (see attached). Their biggest concern was potential silt runoff in to the canal. They <br /> also requested the Operator not mine below the elevation of the top of the canal and that they <br /> always have access to the canal. <br /> Earthen berms have been constructed to mitigate erosion and sedimentation due to stormwater <br /> runoff to the canal. To my knowledge, no mining has occurred below the elevation of the top of <br /> the canal and none is planned. The Operator has previousley committed to maintaining at least <br /> 25 feet between the canal and mining operations. <br /> It is my opinion that a "Slope Stability/Geotechnical Analyses" is not warranted for this structure <br /> because no excavation is planned below the top of the structure. <br /> However, the Operator must maintain the berms, slopes above the canal, and the 25 feet <br /> setback to ensure potential conveyance of soils is mitigated. <br /> a <br /> If you have any questions, please call me at 719-547-7073. ID <br /> Cordially, v <br /> 37210 oz <br /> Joseph V. Gagliano, P.E. z rr )) <br /> Gagliano Engineering, Inc. 0 ��l,'..'J.�• ' '47 <br /> �`S NAL <br /> file(J\2017\=BigG\Structures\BigG-Eng-eval-Highlme.odt) Page I of 2 <br />