Laserfiche WebLink
' Page 2 Mr. Eric Scott <br /> GEIR June 14, 2020 CO DRMS <br /> Construction Details <br /> Al has contracted with Northern Colorado Constructors, Inc.to prepare designs and specifications <br /> for the construction of the haul road. Figure 3 shows the haul road stationing. The haul road will <br /> be constructed using on-site materials which are anticipated to consist of overburden soils for the <br /> ' lower portion of the haul road (below Station (Sta) 10+10), and rockfill for the upper haul road <br /> (above Sta 10+10). <br /> ' Slope stability evaluations using limit-equilibrium methods for the haul road fill sections were <br /> prepared by Cesare, Inc. (Cesare)and are contained in Attachment A. The Cesare report provides <br /> information on laboratory test results and proposed engineering properties for fill, estimated <br /> 1 factors of safety, and recommendations for fill placement. <br /> GEI performed a kinematic evaluation at the proposed roadcut location, contained in Attachment <br /> B. The kinematic evaluation provides a preliminary assessment of potential rock block failure into <br /> the excavation by planar sliding, wedge sliding, and block toppling mechanisms, and results of <br /> that evaluation indicate that block failure is kinematically admissible for several potential block <br /> ' configurations. The report states that on-site observations of rock discontinuities are necessary <br /> during excavation to identify risk-driving features in the excavated faces. <br /> Drainage Analysis and Design <br /> Al contracted to J&T Consulting, Inc. to develop drainage designs for the haul road, which are <br /> ' documented in a memorandum included in Attachment C. The memorandum includes the <br /> delineated drainage basins and information on the drainage requirements for estimated 5-and 100- <br /> year peak flows. <br /> ' RECLAMATION COST ESTIMATE <br /> A cost estimate to reclaim the haul road leading to the West and South Quarries is included as <br /> Attachment D. The haul road reclamation cost estimate is $996,927. Al will procure reclamation <br /> bonds to address these estimated reclamation costs immediately upon DRMS approval of TR-06. <br /> ' Please contact me at 303-929-7012 if you have any comments or questions. <br /> Sincerely, <br /> ' GEI CONSULTANTS, Inc. <br /> Andrew Lockman, P.G. ;Paul Egge , <br /> Project Manager Senior Reviewer <br /> CC: Jeremy Deuto P.G., P.E., Aggregate Industries— WCR Inc. <br />