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or reconstructed with permeable pavement within the past three (3) years unless <br /> a deviation is approved by the Engineer. This restriction does not apply to roads <br /> with a chip-seal surface. Further information is provided in Subsection B. <br /> "Installation," below. <br /> 3. Prior to construction, the contractor/utility may be required to submit a proposed <br /> haul route for review by the Engineer. Based on this review, the Engineer may <br /> require that a haul route agreement be administered by Public Works in <br /> accordance with SCC Title 13. <br /> 4. All utility excavation outside of the improved right-of-way (existing road and fill <br /> slope) shall, to the extent required by Title 30 SCC, undergo appropriate <br /> environmental review to ensure all impacts to wetlands, streams, fish and wildlife <br /> habitat areas and buffers are adequately mitigated. <br /> B. Installation <br /> 1. Lateral trenching shall not be permitted in roads that have been constructed, <br /> reconstructed, or resurfaced with either an asphalt overlay or permeable <br /> pavement within the past 3 years, unless it is shown by the utility that <br /> alternatives, such as boring or jacking, are not feasible and a deviation is <br /> approved by the Engineer. <br /> 2. Where boring is the required or approved installation method: <br /> i. The length of the bore shall extend a minimum of 4 feet from edge of <br /> pavement, if sufficient right-of-way exists. <br /> ii. Unused holes or abandoned casings shall be backfilled. <br /> iii. Water boring under roadways shall not be permitted. <br /> iv. Existing carriers and conduit installed under a roadway shall be physically <br /> located prior to boring. <br /> 3. When trenching through existing pavement, the open cut shall be a neat-line cut <br /> made by either saw-cutting or jackhammering a continuous line. Trench sides <br /> shall be kept as nearly vertical as possible. <br /> i. Trench width shall equal the diameter of the pipe plus a minimum of 12 <br /> inches on each side to ensure adequate compaction by mechanical means. <br /> See Standard Drawing 8-030. <br /> ii. Where a trench crosses pavement, the pavement cut shall be at least 12 <br /> inches wider on each side than the width of the trench to ensure adequate <br /> compaction. <br /> 4. The pipe or carrier, including backfill, shall be installed in a manner that ensures <br /> no deformation of the pipe likely to cause leakage or degradation to the structural <br /> integrity of the roadway. Compaction and restoration shall be accomplished as <br /> detailed below immediately after the trench is backfilled. <br /> 5. Plowing of communication and electrical lines on or adjacent to existing roads by <br /> means of a vibratory plow may be allowed by the Engineer provided the structural <br /> integrity of the roadway will not be impaired. Plowing may be no closer than 4 <br /> feet from the pavement. Use of a "static" type plow is not allowed. <br /> 8-5 Engineering Design and Development Standards <br /> September 17, 2021 <br />