Chapter 5: Sanitary Sewer Collection Systems 129 4. The Applicant shall remove ledge rocks, boulders, and large stones to provide a clearance of at least 6-inches below and on each side of all pipe and sanitary sewer appurtenances for pipe up to 24-inches in diameter. The Field Inspector may direct a greater clearance for pipes larger than 24-inches in diameter. 5. The Applicant shall not install pipe in standing water or when, in the determination of the Field Inspector, trench conditions are unsuitable. The Applicant shall remove and replace pipe installed in unsuitable trenches when rejected by the FieldInspector once proper trench conditions are established. 6. Backfill within an existing or proposed right-of-way shall conform to allapplicable VDOT standards. 7. Backfill in areas subject to vehicular traffic or structural loading shall begin at the top of the granular bedding and be placed in lifts no greater than 8-inches thick.Compact each lift to 95 percent of the maximum dry density as determined by ASTM-D698, American Association of State Highway and Transportation Officials (AASHTO)-T99, or (Virginia Test Method-1) VTM-1. The Applicant shall provide backfill material that is free of organic materials, frozen clods, highly plastic silts or clays, and other unsuitable materials. Backfill shall consist of #57 stone or crushed aggregate of1-inch or less. The Applicant shall provide bedding that is 4 to 6-inches deep, along the side wall, and a minimum of 24-inches above the crown of the pipe as directed by the Field Inspector. 8. The Applicant shall not use stone or rock larger than 10-inches in any dimensionin any backfill. 9. The Applicant shall compact backfill in areas not subject to vehicular traffic to 90 percent of the maximum dry density as determined by ASTM-D698,AASHTO-T99, or VTM-1. 10. The Applicant shall legally dispose of all surplus materials and debris. The disposal of surplus materials or debris on Prince William Water easements or property is prohibited. G. Pipe and Fitting Installations 1. The Applicant shall inspect pipe, fittings, and appurtenances for defects and notify the field inspector of any defects prior to installation. Before inserting gaskets and joining pipe sections, the Applicant shall clean the outside of the spigot and theinside of the bell. The Applicant shall ensure spigots are dry and free from oil and grease before pipe is installed. 2. When installing pipe or manholes in the trench, the Applicant shall use proper implements, tools, and facilities satisfactory to the Field Inspector and as recommended by the manufacturer for the safe and convenient execution of the work. The Applicant shall carefully lower pipe, manholes, fittings, andappurtenances into the trench, piece by piece, by means of a derrick, ropes, slings, or other suitable tools or equipment and in such a manner to prevent damage to pipe, manholes, fittings, and appurtenances, as well as their protective coatings and linings.
