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roadway is shown on Drawing 1. The existing roadway borrow area is to be left at a two percent <br /> outslope, ripped and left in an extremely rough divot condition, and seeded. A supplemental <br /> source of fill material is located approximately 500 feet upstream of Station 8+50, in the <br /> drainage bottom. This borrow area is not to encroach upon slopes steeper than 1 vertical to 10 <br /> horizontal, nor to be excavated below the existing valley floor more than four feet. Slopes are to <br /> be left no steeper than 1 vertical to 10 horizontal. The remaining surface is to scarified, left in an <br /> extremely rough divot condition, and seeded. <br /> Foundation Preparation: All areas on which fill is to be placed are to be scarified to a depth of <br /> six inches and recompacted (see compaction). All disturbed ground for the culvert bedding is to <br /> be recompacted A bedding for the culvert is to be prepared on a compacted base (to include <br /> any disturbed materials) to provide full support along a continuous 2% grade. All foundation <br /> preparation for the culvert is to be observed by a Division of Minerals and Geology inspector. <br /> Compaction: Materials are to be compacted at a moisture content of 10 to 14%, but not so wet <br /> that shoving or heaving is experienced with the applicable compactive effort. Culvert bedding <br /> and fill material placed within four feet of the culvert is to be hand compacted (air tamper or <br /> walking roller) in lifts not to exceed four inches, with a minimum of three passes. Roadway fills <br /> are to be placed in lifts not to exceed 6 inches in depth, and compacted with a minimum of four <br /> passes of a "mass per foot width of a 1200 to 1500 pound" vibrating roller or equivalent. <br /> Wearing Surface <br /> The finished roadway wearing surface is to be a minimum of 6 inches of 2" minus crushed <br /> angular durable rock or roadbase, compacted by a minimum of two passes of a roller with the <br /> compactive effort described above. <br /> Culvert <br /> The culvert is to be a corrugated metal pipe, corrugations not less than 3-inch by 1-inch, and of <br /> a minimum gauge of 12. <br /> Riprap <br /> Riprap is to be composed of durable rock with not more than 50% of the material under two feet <br /> in diameter (D50 = 2 feet). Riprap is to be underlain by Merafi 140N or equivalent fabric, <br /> overlapping edges not less than one foot (a fabric to prevent washout of fine soil particles but <br /> allows passage of moisture). <br /> Grout <br /> All riprap less than 6 inches in diameter will have interstitial spaces grouted with concrete.All <br /> concrete will be of a Portland cement type with a 30-day compressive strength of not less than <br /> 1500 pounds per square inch. Grout is to be a minimum of 4 inches thick, 1 foot thick at <br /> junctures with the culvert and existing weir. All grouted areas, as well as riprap areas, are to be <br /> underlain by Merafi 140N or equivalent fabric. <br /> 7 <br />