Trench Backfill. All trench backfill material shall be a 3” minus imported granular backfill meeting AASHTO M 145 classification A-1-a. (Do not use gravel or sewer rock). Material must be placed at a maximum lift thickness of 8” before compaction. Material shall be compacted to 95% of the modified xxxxxxx density as determined by ASTM 1557. Compaction testing will be conducted by a certified material testing lab at the contractor/ permit holders expense. Should the applicant find it necessary to change this method or any part of it, approval must be obtained from the City Engineer.
Trench Backfill. All trench backfill material shall be CA-6 or CA-7 unless otherwise noted on the Drawings. 210 FABRIC FOR GROUND STABILIZATION Fabric for ground stabilization (geotextile fabric) shall be provided between the subgrade and subbase in areas of pavement construction or reconstruction. Fabric shall be SUPAC–N51, or equal. 255 RESTORATION Restoration shall include providing and placing 6 inches of topsoil, salt-tolerant seed or sod, fertilizer, and watering where indicated on the Drawings, in this Specification, or by OWNER or ENGINEER, in accordance with applicable portions of Sections 211, 212, and 252 of the Standard Specifications. Sod placed within ditch flow lines and at culvert inverts shall be staked. CONTRACTOR shall be responsible to apply additional watering applications for up to three weeks after installation of seed or sod or until acceptable catch is achieved. ENGINEER’s estimated quantity for restoration is { } square yards based on cross sections and Drawings contained in the drawing set. CONTRACTOR shall be responsible to make his own computation for restoration in compiling the lump sum price bid. No changes will be made in the lump sum payment unless changes are made in the Drawings by ENGINEER or OWNER after award of the Contract. The lump sum unit cost will be modified more or less to reflect these changes by dividing the lump sum bid price by the total ENGINEER’s estimate. Restoration will be paid for at the Contract lump sum price for Restoration–Seed or Restoration-Sod. No additional payment will be made for supplemental seeding, watering, fertilizing, or erosion control placement necessary to obtain the proper catch. This Contract shall include a deductive alternative bid for comparison of restoration with sod versus restoration with seed. CONTRACTOR shall provide a unit price bid for Restoration–Sod, which shall be used to calculate the Contract base bid. CONTRACTOR shall also provide a deductive alternative for Restoration–Seed. The deductive alternative shall be subtracted from the Contract base bid to determine the Contract alternative bid. The project may be awarded based on either the Contract base bid or the Contract alternative bid. 280 TEMPORARY EROSION CONTROL Dewatering discharges shall be provided with erosion control filters to remove sediments and to protect open drainageways and surface waters. Erosion controls shall be installed as shown on the Drawings, indicated in these Specifications, or required by law or ordinance...
Trench Backfill a. 1 test per lift per 500 LF, or fraction thereof, of trench in open areas.
Trench Backfill. Compaction of backfill from the bottom of the trench to 6” above the top of the pipe shall be as specified in Section 3.3.08, Pipe Bedding. Backfilling and surface restoration shall closely follow installation of pipe so that not more than 100’ are left exposed during construction hours without approval of the City. Backfill shall not be deposited in the trench in any manner which will damage or disturb the pipe or the initial backfill. Compaction of the backfill may be accomplished by mechanical tamper, by vibrating, rolling, jetting, or a combination of these methods, as approved by the City. The Developer shall provide the services of a testing laboratory acceptable to the Engineer to perform in place density tests to show that the specified density has been obtained. The approval of the compaction method and the achievement of the specified density shall, in no way, relieve the Developer of responsibility for all repairs caused by settlement of the backfill prior to acceptance and during the two-year period after acceptance of the project. All trenching shall be backfilled with bank run gravel for trench backfill materials conforming to the WSDOT Standard Specifications Section 9-03.19, unless otherwise approved by the City. The City shall be the sole judge of approving materials to be utilized for backfill. All backfill material shall be free from cinders, ashes, refuse, vegetable or organic material, boulders, rocks or stones, frozen soil, or other unsuitable material. Backfill shall be compacted to 95% of the maximum density in traveled areas and road prisms, driveways, roadways, shoulders, parking lots or other traveled areas and 90% in all other areas. Backfill compaction shall be performed in 8” to 12” lifts. Compaction test results shall be supplied to the City for review and approval prior to paving.
Trench Backfill. A. Trench backfill shall conform to the requirements specified by the Engineer. When no material requirements are specified, the Contractor may use soil material excavated from the trench as backfill, provided that it meets the requirement of On-Site Backfill. If trench spoil is wet, rocky, or contains other objectionable materials, the Contractor shall furnish and install Select Backfill. Unacceptable trench spoil shall be wasted in a manner approved by the Engineer.
Trench Backfill. A. Trench backfill under un-paved areas shall consist of on-site backfill or select backfill. When no material requirements are specified, the Contractor may use soil material excavated from the trench as backfill, provided that it meets the requirement of On-Site Backfill. If trench spoil is wet, rocky, or contains other objectionable materials, the Contractor shall furnish and install Select Backfill. Unacceptable trench spoil shall be wasted in a manner approved by the Engineer.
