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<br />High Rock Road Waste & Recycling Center Improvements 33 30 00 - 14 <br />Orange County Solid Waste MARCH 2019 <br />DAA PN R00592-213N <br /> <br />mortar. Brick and mortar shall be as herein specified, and the seal shall <br />be such to withstand hydrostatic pressure from ground water and all <br />backfill loads. Contractor shall provide means to prevent water line from <br />floating within the encasement pipe. Grouting procedure will not be <br />allowed. <br /> <br />E. Casing pipe and joints shall be of leakproof construction, capab le of <br />withstanding railway or traffic loading. The diameter of the casing pipe <br />shall be at least 2" greater than the largest outside diameter of the carrier <br />pipe, joints, or couplings for carrier pipe less than 6" in diameter and at <br />least 4" greater for carrier pipe, 6" in diameter and greater, unless <br />indicated differently on drawings. Further, the casing pipe shall be of <br />great enough diameter to allow carrier pipe to be removed subsequently <br />without disturbing the case pipe and immediate areas. <br /> <br />F. Steel encasement pipe shall be as specified in item 2.10 of this section. <br /> <br />3.6 TRENCH EXCAVATION <br /> <br />A. Trench excavation shall be made along the lines designated by the <br />Engineer and to the depth necessary for laying the sewer to the required <br />grade. <br /> <br />B. Sides of trenches shall be kept as nearly vertical as is allowable by the <br />Occupational Safety and Health Administration. They shall be at least 12" <br />and not more than 24" wider at the top of the pipe than the outside <br />diameter of the pipe plus sheathing where it is necessary. Whe re <br />pavement is to be cut. It shall be cut in advance of trenching 1' wider than <br />the required width of the trench. <br /> <br />C. Where soil conditions prohibit vertical walls, the trench width at the bottom <br />and to 1' above the top of the pipe shall be as specified above with the <br />remainder being held to the least possible width greater than that <br />specified. Where soil conditions prevent ditch excavation without <br />excessive widths, or where directed by the Engineer, wood or steel <br />sheeting, as hereinafter specified, shall be driven to support the trench <br />walls, or a suitably reinforced steel trench box shall be employed. <br /> <br />D. Trench bottoms shall be hand graded to provide uniform and continuous <br />bearing for the pipe along its entire length, with bell holes being dug for <br />pipe bells. No ridges, sags, or undercutting will be allowed. Excess <br />excavating below grade shall be backfilled at the Contractor's exp ense <br />with suitable material which shall be thoroughly stamped. <br /> <br />E. If approved by the Engineer and subject to suitable soil condition s, the <br />trench may be excavated a few inches below the established subgrade <br />and backfilled with selected material (from the excavation, if available) well <br />DocuSign Envelope ID: BBF56E0A-3618-497E-AA70-92F097E8F598