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. Where utility placement is within a public way scheduled for construction or reconstruction, <br />if a grade has been established, all underground pipes and conduits shall be laid a minimum <br />depth of 30 inches below the design grade of the new construction. <br />Exceptions to the 30-inch minimum depth requirement may be allowed under special <br />circumstances. Examples of possible qualifying circumstances include: gravity flow <br />systems which, due to topography or site constraints, must be shallower to maintain <br />minimum slope; unavoidable grade conflicts with existing underground facilities; and, site, <br />topography and/or subsurface conditions prohibitive of excavation at standard depth. <br />6. No portion of a utility trench within a street may be located closer than 1 foot parallel to the <br />face edge of the gutter. Utility trenches shall not be located closer than 1 foot parallel to the <br />back edge of the curb. <br />7. Whenever pavement removal within public streets would cause the pavement to be cut <br />within 3 feet of an existing edge, curb, score, joint or crack, the existing pavement shall be <br />removed to that edge, curb, score, joint or crack. Undermined street sections shall be <br />removed. <br />8. Minimum width of pavement cuts shall be 3 feet in Portland Cement Concrete streets, alleys, <br />and driveways; and a "T" trench in asphalt concrete streets which shall be computed as <br />follows: Surface Width of Trench (including sloughing) + 1 Foot (6 inches each side). An <br />acceptable alternative to using the "T" trench is through the performance of compaction <br />testing by an independent testing lab. If this alternative is selected, frequency of the compac- <br />tiontesting shall be as is specified by the City on City contract prof ects. Alternate trenching <br />and backfill methods resulting in pavement cuts which differ from these standards maybe <br />submitted for consideration on acase-by--case basis. <br />Pavement restoration for vacuum type excavation and core cuts shall be 24 inch square in <br />Asphalt Cement Concrete streets and 36 inch square in Portland Cement Concrete streets. <br />With prior approval, the Inspector may allow the use of specific polymer based permanent <br />cold patch for the permanent restoration of core holes up to 8 inches in Asphalt Cement <br />Concrete streets. An exception to the backfill for vacuum type excavation within or adj acent <br />to paved surfaces shall be controlled density fill (CDF). Surface restoration for vacuum <br />excavation shall conform to requirements of section 3.B.1 Portland Cement Concrete Streets. <br />Allevs and Driveways for concrete surfaces and 3.B.2 Asphalt Cement Concrete Streets for <br />asphalt surfaces. Monitoring wells within or adjacent to paved surfaces shall be backfilled <br />with bentonite to a level equal with the sub-grade with CDF within the base area. <br />9. Cutting of existing pavements shall be performed with a rotary saw. The alignment of the <br />cutting shall be straight and the cutting depth shall be to a minimum of 60 percent of the <br />existing pavement depth. <br />Utility & R/W Permit Manual <br />Exhibit A - 28 <br />C:\WINDOWS\Temporary Internet Files\OLKB202\03rowrlexa.wpd -Manual (03ROWR 1).WPD(11/07/03) <br />