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2023 Docket Enabling Ordinance December 19, 2023 <br />Page 196 <br /> <br /> <br />approved by the county. The drain outfall shall not be used as a wasteway for routine <br />purging of the carrier unless specifically authorized by the county. <br />3. Location markers and emergency information should be used when required by <br />applicable state and federal standards. <br />4. Manholes should be designed and located in a manner that will cause the least <br />interference to other utilities or future road expansion. Where practicable, installations in <br />the pavement or shoulders should be avoided. (Ord. 94-18 (part), 1994; Ord. 92-30 Exh. <br />A § 6E, 1992. Formerly 12.20.230). <br /> <br />12.14.02.240 Underground utilities - Installation. <br />Installations shall ensure safety of traffic and preservation of the roadway structure, and required construction shall, unless otherwise provided in the approved permit, be in accordance with the following controls: <br />1. Trenched Construction and Backfill. <br />a. Where the pavement must be removed, it first shall be cut in vertical (or <br />undercut) continuous straight lines. <br />b. Trenches shall be cut to have vertical faces, where soil and depth conditions <br />permit, with a maximum width of outside diameter of pipe plus two feet. <br />Shoring shall comply with the Washington State Department of Labor and <br />Industries Safety Code. <br />c. The pipe or carrier shall be installed and the trench backfilled in a manner <br />assuring no deformation of the pipe likely to cause leakage and restoration <br />of the structural integrity of the roadway structure. Specific trench backfill <br />requirements regarding materials and methods shall be provided by the <br />county. <br />d. When trenching is approved on paved roads, the pavement shall be restored <br />as required by the county. <br />2. Untrenched construction may be required for pipelines crossing roads paved with <br />asphalt concrete or cement concrete and for roads paved with bituminous surface <br />treatment when directed by the county. <br />a. If sufficient right-of-way exists, the length of untrenched construction shall <br />extend a minimum of four feet from edge of pavement, except that a lesser <br />standard may be permitted by the county engineer where conditions <br />warrant. <br />b. Overbreaks, unused holes, or abandoned casings shall be backfilled as <br />directed by the county engineer. <br />c. Water boring under roadways shall not be permitted. <br />d. Existing carriers and conduit installed under a roadway may be physically <br />located prior to pipeline installation.