Laserfiche WebLink
• • Received <br />PERMANENT MAN-MADE STRUCTURES ADDENDUM. NOV 2 4 1997 <br />STRIPPING AND RECLAMATION ACTIVITIES ANALYSIS Durarga FgldOfflC9 <br />Divlsian of Minerals 8 Geology <br />This analysis applies to the construction of the Site Berm <br />along the south side of Delta Sand and Gravels' Pit #1 where the <br />operation will be within 200 feet of the Union Pacific Railroad <br />(U.P.R.R.) line. The berm material is stripped from the property <br />north of the fence separating the U.P.R.R. R.O.W. and the East <br />Parcel. Two activities need to be evaluated to see if they could <br />impact offsite structures. The first is the stripping activity <br />and the second is the berm construction in the area adjacent to <br />the south line. <br />Stripping <br />This activity will remove approximately 7 inches of topsoil/ <br />overburden from the area between the north side of the proposed <br />berm and a line running 200 feet from and parallel to the fence <br />next to the railroad line. The shallow nature of the excavation <br />and the distance from the structure limit what impacts would <br />occur. Slope failure is not an issue because of the shallow <br />nature of the excavation. The normal operation of heavy equip- <br />ment on the site would be less detrimental than the trains <br />traveling the line now. The minor disturbance created by removal <br />of material would not impact the structure. <br />Berm construction <br />The berm will be constructed parallel to the existing <br />fence. As shown on cross section B-B', the outer edge of the <br />berm will be between 14 and 16 feet from the fence. This is done <br />so we will not have to worry about material leaving the mine site <br />during construction. The berm will be from 6 to 8 feet tall <br />depending on the amount of material we have to removed to get to <br />the gravel deposit. The outer toe of the berm will be approxi- <br />mately 49 feet from the rail bed when this is done. The overall <br />slope of the surrounding land is towards the mine reducing the <br />chances of upgradient migration of material. <br />A motor scraper is used for this operation and as the load <br />of material is spread, the pile will be compacted. Multiple <br />trips are necessary so each level get compacted as the height <br />increases. This method of construction creates a berm that is <br />layered and compacted as it is built. While we have no compac- <br />tion ratios for this method, it is usually adequate to assure <br />berm stability. once the final height is reached the side slopes <br />will be graded to 2h to lv, and revegetated to protect the berm <br />from erosion. This type of construction creates a stable pile of <br />material that will not move once revegetated. Again, the rela- <br />tive low height of the berm in relation to the railroad, the <br />distance from the tracks and the design of the berm all act to <br />prevent its placement from impacting the structure. The only <br />impact the berm could have on the railroad would be if the slopes <br />degraded and past experience has shown this is unlikely. The 49 <br />foot separation and the land slope would protect the railroad <br />from a berm slope failure. <br />it is our opinion that stripping the area north of the fence <br />and the berm construction will not impact the railroad. <br />