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S � 4916o1,a) <br /> JAN 18 2017 <br /> DMSION OF RECLAMATION <br /> January 12, 2017 MINING&SAFETY <br /> AL <br /> Mr. Peter S. Hays <br /> Division of Reclamation, Mining& Safety AGGREGATE <br /> 1313 Sherman Street, Room 215 . D U ST R I E S <br /> Denver, CO 80203 <br /> Re: Permit M-1992-069— 83rd Joint Venture Pit <br /> July 12, 2016 Inspection(Signature Date December 14, 2016) <br /> Corrective Action Response <br /> Dear Peter: <br /> As requested in the Division's report of its July 12, 2016 inspection of the 83rd Joint Venture site, <br /> Aggregate Industries (AI)had the Wright Water Engineer's, Inc. (WWE) September 2, 2016 <br /> report entitled"Engineering Evaluation of Nature and Causes of Erosion in Agricultural Field <br /> Adjacent to Boyd Irrigation Company Pipeline and Damage to Pipeline"reviewed by AI's <br /> consultants, Tetra Tech. Enclosed is Tetra Tech's letter dated January 11, 2017 regarding their <br /> review and evaluation of the WWE report and the March 2011 Preliminary 90% Design <br /> Documents for the Boyd Freeman Ditch as referenced in the Tetra Tech letter. <br /> In addition to complying with approved slope reclamation prior to the 2010 flood event, Al <br /> believes it would be beneficial for the Division to understand some background related to the <br /> relocated Boyd Freeman Ditch through the 83rd Joint Venture site (also referred to as the F Street <br /> Hill Property). Al constructed the replacement ditch along the alignment shown in Exhibit F of <br /> the approved Reclamation Plan. As discussed during the meeting between the Division and Al <br /> on August 26. 2016, Al coordinated with the City of Greeley/Boyd Irrigation Company <br /> (City/Boyd) over a period of years regarding replacement of the ditch. Al was constructing a <br /> ditch that would deliver historic capacity; however, completion of the ditch was deferred while <br /> City/Boyd determined what ditch improvements they might want to incorporate to accommodate <br /> additional flows. <br /> Ultimately,the majority of the ditch was constructed as an open ditch that would accommodate <br /> historical capacity; however, in order to accommodate an access road along the ditch at the east <br /> end of the north boundary of the site, Al proposed to install a piped section. The piped section <br /> was upgraded per City/Boyd's request to accommodate greater ditch flows. Enclosed are letters <br /> dated February 2, 2006, March 3, 2006 and March 13, 2006 between Al and City/Boyd <br /> regarding the requested upgrade. This final section of the ditch was completed in May, 2006, as <br /> Aggregate Industires <br /> West Central Region,Inc. <br /> 1687 Cole Boulevard,Suite 300 <br /> Golden,CO 80401 <br /> Telephone:303-985-1070 <br /> An Equal Opportunity Employer <br />