2000-12-05_GENERAL DOCUMENTS - C1981017 (4)

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IV. CONSTRUCTION SUMMARY Following Notice To Proceed,two track hoes, a light dozer, a small end dump truck and miscellaneous equipment was mobilized to the site. The purpose of the project was to reclaim Roads B,C, D and the Huntsman Ridge access road. This was accomplished by removing approximately 35 road drainage culverts, excavating dirt from the outside margin of the road and filling it on the inside' of the road, constructing approximately 153 rolled dips to transport water from the inside margin of the road to the outside margin of the road, constructions of 18 low water crossings at points where larger flows can be expected, severely scarifying the road and revegetating the road surfaces. Initially,the Bid specified that the road surfaces would be inclined toward the inside margin of the roads at a 7% angle as measured from the outside margin of the road. A field directive(No. 1)changed the overall grade upwards to an average of 8.5%. thus increasing the ability of the roads to shed water, which is desirable in order to minimize erosion potential. The road drainage characteristics were re-evaluated prior to construction beginning, and it was determined that additional drainage structures would greatly benefit roads B and C in a reclaimed condition. To this end, an additional 34 rolled dips were constructed on Road C, and an additional 6 were constructed on Road B. In an effort to distribute probable runoff from the outlet end of about half of the rolled dips, logs were anchored in the ground perpendicular to the centerline of the dips. The thought is that water will contact the logs, and traverse laterally,thus dispersing the flow on the road outslope. The Grade of the fill was continuously checked during construction so that the Contractor was constantly aware of his progress toward successful completion of he Project. Rolled Dip,Low Water Crossings and other pertinent construction points were marked with 48"lathe. Each piece of Lathe was numbered to designate the road number, feature number and construction feature to be built. Specific instructions for that point were also written on the lathe as needed. Lathe was color coded, using surveyor tape,to denote at a glance the type of feature to be constructed. This system allowed for an easy reference for the Contractor and Project Manager. This allowed the contractor to visualize specific construction details prior to actually performing the work, and allowed for easy reference points when contractor and Project manager were discussing specifics of the Project. It was also a convenient system for tracking Contractors progress and the number of features built. Following completion and acceptance of the grading work,the roads were fertilized using 300 pounds per acre of 18-46-0. This was done prior to scarification in the hope that the scarification process would serve to work the fertilizer into the dirt, and because it was more desirable to have the fertilizer truck traverse the road prior to roughening it. Surface scarification of the road surface was accomplished using the small dozer(D-4 equivalent). Rippers were spaced at 18" and were about 20"in length. Ripping began at the top of each road, and proceeded down the road toward the bottom of the Basin. In accomplishing the ripping, the dozer was angled downhill facing the inside margin of the road at about a 30 degree angle, with the rippers hanging over the outside edge of the road. The dozer would rip to the inside of the road, then turn down-road just before the dozer blade touched the inside cut slope. This was a time consuming process, requiring a lot of backing up to accomplish the direction of rip desired. However ripping in this manner created a trough and ridge system roughly perpendicular to the fall of the fill slope,given the grade of the road, combined with the slope of the fill. The rip succeeded in creating an exceptionally roughened surface for the entire width and length of the road. The dips and low water crossings were not ripped, however, as it was felt that this could result in unacceptable amounts of sediment being washed into