8.1. SR 06-03-2019 - Laserfiche WebLink

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C. All excavations shall be kept free of water during the placement of fill. D. The Contractor shall utilize methods and equipment for excavating that will minimize the disturbance to the subgrade. The use of backhoes rather than scrapers or front-end loaders may be required to minimize repeated passes of equipment over wet subgrade soils. E. At the end of each day the Contractor shall eliminate surface indentations, including those caused by sheepsfoot rollers,tractor tires and tracked equipment,and roll the surface with a steel wheel or rubber tired roller. F. Sufficient common excavation shall be utilized by the Contractor to replace the soil shrinkage from excavation which occurs through the course of construction handling and compaction. The Contractor shall make his own estimate of the amount of shrinkage that will occur. G. Topsoil 1. Topsoil shall be salvaged and stockpiled in locations shown on the plans or in areas requiring final turf establishment,as approved by the Engineer. 2. Once the salvaged topsoil is stockpiled,the Contractor shall make an estimate of any potential shortage or surplus of topsoil possible in meeting the other provision of this Contract and notify the Engineer of the estimate. 3. The first priority in re-distributing the topsoil on site shall be to meet the minimum depths required over the entire project area. 4. In areas requiring final turf establishment with no proposed or anticipated structural improvements (building pads,etc.),topsoil shall be spread uniformly to a minimum depth of 6.0-inches, unless otherwise indicated in the plans. 5. In areas requiring final turf establishment with proposed or anticipated structural improvements (building pads,etc.),topsoil shall be spread to a depth of 2.0 to 4.0-inches. 6. In areas not requiring final turf establishment with proposed or anticipated structural improvements, no topsoil shall be placed. H. In areas where filling above the existing grade is necessary to establish the final designed elevation,the Contractor shall fully remove the topsoil and organic material to the level of stable underlying sand or clay prior to backfilling with suitable embankment material. I. The Contractor shall make his own determination as to whether the proposed grading has been completed according to the plans. When the Contractor determines that the grading has been completed, he will notify the Engineer. Neither the Owner nor the Engineer will provide any intermediate acceptance of the grading improvements until all of the grading has been completed and all topsoil has been spread. 3.2 EXCAVATION AND EMBANKMENT IN AREAS WITH PROPOSED STRUCTURAL IMPROVEMENTS. A. All vegetation,topsoil,organic,or other unsuitable materials shall be excavated from the area below the structural improvement. Due to the variability of soils,the depth of the excavation in these areas is expected to vary significantly throughout the site.The excavated area shall be inspected by the geotechnical engineer as specified in Field Quality Control. B. Subcut excavations shall be laterally oversized a distance of 1.0-foot beyond the edges of the proposed structural improvement for each foot of excavation depth (1:1 oversizing). The extents of the structural improvement areas shown on the plans do not necessarily show this 1:1 oversizing. C. Fill placed from the bottom of the subcut to the subgrade elevation shall be selected material from the excavation or borrow material. Such material shall consist of suitable material as defined above. Clay fill shall be moisture-conditioned to within 2 percent above or below the optimum moisture content determined from the Standard Proctor compaction test. D. The embankment material shall be spread in 6.0 to 8.0-inch loose lifts. Elk River Landfill, Inc. -R16.115896 EXCAVATION & EMBANKMENT-SITE GRADING March 2019 PAGE 02310-3 V122217©Bolton&Menk,Inc.2018,All Rights Reserved