2725 32ND AVE NE 2018-01-02 MF Import

SCHEDULE B: SMITH`.,LAND LANDFILL 177065B PHASE 2 CLOSURE IMPROVEMENTS B. Restrain pipe as necessary to prevent their movement during backfill operations. C. Place material simultaneously in lifts on both sides of pi-je or manhole. 1. Pipe 10-Inch and Smaller Diameter: First lift less than or equal to 1/2 pipe diameter. 2. Pipe Over 10-Inch Diameter: Maximum 6-inch lifts. D. Thoroughly tamp each lift, including area under haunches, with handheld tamping bars supplemented by "walking in" and slicing material under haunches with a shovel to ensure that voids are completely filled before placing each succeeding lift. E. After the full depth of the pipe zone material has been placed as specified, compact the material by a minimum of three passes with a vibratory plate compactor only over the area between the sides of the pipe and the trench walls. F. Do not use power -driven impact compactors to compact pipe zone material. 3.7 BACKFILL ABOVE PIPE ZONE A. Trench in Waste: Backfill with excavated waste material to required grades shown on Drawings. Place in maximum 8-inch uncompacted lift thickness and compact material with a minimum three passes with a vibratory plate compactor. B. Trench in Non -Waste Material: Backfill with earthfill to required grades shown on Drawings. Place in maximum 12-inch uncompacted lift thickness and mechanically compact each lift to 90 percent relative compaction prior to placing succeeding lifts. 3.8 SEEPAGE BARRIER (TRENCH PLUG) A. Install trench plug in outlet pipe trench at location shown on the Drawings. B. Contractor shall select material as specified in Article Seepage Barrier (Trench Plug). 1. Low permeability fill, place iri maximum 8-inch uncompacted lifts and compact to 95 percent relative compaction. 2. For controlled density fill, place as specified in Section 2-09.3(1)E of the Standard Specifications. SEA/177065.A7.-9 JULY 16, 2004 02320 4 TRENCH BACKELI.