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<br />High Rock Road Waste & Recycling Center Improvements 33 30 00 - 19 <br />Orange County Solid Waste MARCH 2019 <br />DAA PN R00592-213N <br /> <br />in mortar shall be used to adjust the top to finished grade, however, <br />no more than four courses of brick will be used for adjustment. <br /> <br />7. When using 5' diameter manholes, the Contractor may use 5' <br />diameter sections for the full depth or he may use a reducing <br />section to reduce the inside diameter to 4' at a minimum height of <br />42" from the floor of the manhole. <br /> <br />E. Manhole Drops: Manhole drops shall be supported and encased in brick <br />work, and the backfill very thoroughly compacted. Should the trench for <br />the upper sewer be excavated below grade beyond the brick work, <br />enough cast iron pipe shall be used to provide a bearing of 2' on original <br />ground. <br /> <br />F. Manhole Tops: Manhole tops shall be set to the proper elevation as <br />dictated by the location, or as directed by the Engineer. Care shall be <br />exercised to set the tops at the proper elevation. Where manholes are <br />located in streets or roads, the tops shall be set to conform to the finished <br />grade of the roadway. Tops of manholes located in yards, roadway <br />shoulders or populated areas shall be set flush with the ground elevation, <br />unless directed otherwise by the Engineer. In cultivated fields, wooded <br />areas and along outfall sewers the manhole tops shall be set <br />approximately 1' above the elevation of the ground unless the line is <br />subject to flooding or other hazards. In such instances manhole tops shall <br />be set to the elevations given by the Engineer. <br /> <br />3.10 BACKFILLING <br /> <br />A. All trash, forms, debris, and other foreign material shall be cleared from <br />around all pipes and structures before backfilling. <br /> <br />B. Backfilling around the pipe and to a depth of at least 1' above the top of <br />pipe shall be placed by hand in layers of not over 6". Only select material <br />containing no rocks or other objectionable material shall b e used for this <br />portion of the backfill. As fast as the material is placed, it shall be cut <br />under the haunches of the pipe with a shovel and thoroughly compacted <br />with mechanical tamps for the full width of the trench to provide support for <br />the bottom and sides of the pipe. Filling shall be carried up evenly on both <br />sides. <br /> <br />C. The balance of the backfill shall be placed and tamped to prevent <br />excessive settlement in a manner satisfactory to the Engineer. If the <br />trench backfill is located under miscellaneous paved areas, areas to be <br />paved, or unpaved streets, the trench shall be backfilled with suitable <br />material free from large stones or clods in 8" layers (loose measurement) <br />and thoroughly tamped and compacted to 95% of maximum as <br />established by AASHTO specification T99, method A, with mechanical <br />DocuSign Envelope ID: BBF56E0A-3618-497E-AA70-92F097E8F598