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3.4. Each bale shall be embedded in the soil a minimum of 4 inches (101 mm). Use straw, rocks, or filter fabric <br />to fill any gaps between the bales and tamp the backfill material to prevent erosion under or around the bales. <br />3.5. If the bales are wire bound, they should be oriented so the bindings are around the sides rather than along <br />the top and bottom. Wire bindings that are placed in contact with the soil soon disintegrate and may allow the <br />bale to fall apart. <br />3.6. The bales shall be securely anchored in place by two wooden stakes or rebar driven through the bales. The <br />first stake in each bale shall be driven toward the previously laid bale to force the bales tightly together. Drive <br />the stakes at least 18 inches (0.5 m) into the ground. <br />3.7. The straw bales do not need to be anchored if the bales are used on a relatively flat construction area and <br />the straw bale dike is inspected regularly. The trapped sediment should be removed when required, and repairs <br />made promptly. The bales also do not need to be anchored if they are to be removed and replaced daily to <br />facilitate construction. <br />4. Surtace Roughening of Stockpiled Topsoil and Cut Banks for Roadways <br />4.1. Cut Slope Roughening: <br />4.1.1. Stair-step grade or groove the cut slopes that are steeper than 3:1. <br />4.1.2. Use stair-step grading on any erodible material soft enough to be ripped with a bulldozer. Slopes <br />consisting of soft rock with some subsoil are particularly suited to stair-step grading. <br />4.1.3. Make the vertical cut distance less than the horizontal distance, and slightly slope the horizontal <br />position of the "step" in toward the vertical wall. <br />4.1.4. Do not make individual vertical cuts more than 2 feet (0.6 m) high in soft materials or more than 3 <br />feet (0.9 m) high in rocky materials. <br />4.1.5. Groove the slope using machinery to create a series of ridges and depressions that run across the <br />slope, on the contour. <br />4.2. Fill Slope Roughening <br />4.2.1. Place fill slopes with a gradient steeper than 3:1 in lifts not to exceed 8 inches (0.2 m), and make <br />sure each lift is properly compacted. <br />4.2.2. Ensure that the face of the slope consists of loose, uncompacted fill 4-6 inches (0.1-0.2 m) deep. <br />4.2.3. Use grooving or tracking to roughen the face of the slopes, if necessary. <br />4.2.4. Apply seed, fertilizer and straw mulch then track or punch in the mulch with the bulldozer. <br />4.2.5. Do not blade or scrape the final slope face. <br />4.3. Roughening With Tracked Machinery: <br />4.3.1. Limit roughening with tracked machinery to soils with a sandy textural component to avoid undue <br />compaction of the soil surface. <br />4.3.2. Operate tracked machinery up and down the slope to leave horizontal depressions in the soil. Do <br />not back-blade during the final grading operation. <br />4.3.3. Immediately seed and mulch roughened areas to obtain optimum seed germination and growth. <br />5. Waterbars and Rolling Dips (where required for temporary erosion control) <br />5.1. Install the diversion as soon as the right-of-way has been cleared and graded. <br />5.2. Construct a more gentle rolling dip if the road is intended for winter use and use by vehicles with low <br />clearance. <br />5.3. The waterbars and rolling dips should be built at an angle of 45 to 60 degrees from the centerline. <br />5.4. The diversion slope should have a positive grade of 2% minimum. <br />5.5. For rolling dips the height from channel bottom to the top of the settled ridge shall be 18 inches (0.5 m) and <br />the side slopes of the ridge shall be 2:1 or flatter. <br />SPECIFICATION F STORMWATER AND DRAINAGE PAGE 2 <br />