SECTION EARTHWORK

Transcription

1 SECTION EARTHWORK PART 1 - GENERAL 1.01 WORK INVOLVED A. Provide all labor, materials and equipment as required for all excavation, grading, providing borrow materials, hauling, placing and compacting earthwork materials to construct the site to the grades shown on the Plans. B. Construct the stormwater detention ponds as shown on the Plans. C. Construct earthwork and grading for all roads, streets, etc. D. Construct any ditches or minor earthwork facilities as shown on the Plans. E. Haul and stockpile material on site for backfilling all retaining walls and buildings RELATED WORK A. Section Clearing and Grubbing B. Section Site Grading C. Section Structural Excavation and Backfill D. Section Trench Excavation and Backfill E. Geotechnical Investigation Report 1.03 REFERENCES A. ASTM D Sieve Analysis of Fine and Coarse Aggregates B. ASTM D Density of Soil by the Sand-Cone Method C. ASTM D Moisture-Density Relations of Soils and Soil - Aggregate Mixture Using 10 lb. Rammer and 10-inch Drop D. ASTM D Density of Soil and Soil-Aggregate In Place by Nuclear Methods (Shallow Depth) 03/30/

2 E. OSHA and other applicable sections. F. UDOT Specifications - Latest Edition 1.04 SITE CONTROL A. Unfavorable Weather: Do not place, spread or roll any fill material during unfavorable weather conditions. Do not resume operations until moisture content of material is satisfactory. B. Flooding: Provide berms or channels to prevent flooding or saturation of subgrade. Promptly remove all water collecting in depressions. C. Softened Subgrade: Where soil has been softened or eroded by flooding or placement during unfavorable weather, remove all damaged areas and recompact as specified for fill. D. Dust Control: Use all means necessary to control dust on and near the work and on and near all off-site borrow areas. Thoroughly moisten all surfaces as required to prevent dust from being a nuisance to the public, neighbors, residents, properties, and concurrent performance of other work on the site. E. Noise Control: Use equipment that is equipped with adequate noise attenuation devices. Do not cause noise during the nighttime OFF-SITE CONTROLS A. Comply with all traffic and hauling requirements of the State of Utah, County, and the BYU City. B. Provide all signing, flagmen or other special traffic control required to provide for the safety of the public. C. Use only vehicles approved for highway use and comply with all load requirements. D. Hauling may be done during any time of the day or night. E. Provide wheel cleaning as required to minimize the tracking of materials onto public roadways. F. Immediately clean up any tracked or spilled materials on or along public roadways. 03/30/

3 1.06 PROTECTION 1.05 TESTS 1.06 SAMPLES A. Protect trees and other features to remain as a portion of the final landscaping or project. B. Protect bench marks, existing structures, fences, sidewalks, paving and curbs from equipment and vehicular traffic. C. Protect above and below grade utilities which are to remain. D. Notify Engineer of unexpected subsurface conditions and discontinue affected work in the area until notified to resume work. E. Protect bottom of excavations and soil adjacent to and beneath foundation from frost. F. Grade excavation top perimeter to prevent surface water runoff into excavation. A. Tests and analysis of fill materials will be performed in accordance with ASTM D-1556, ASTM D-1557, and ASTM D-2922 by the Owner Representative. A. Submit samples in accordance with Section B. Submit gradation and proctor tests to the Owner Representative. Provide 50 pound samples to the Owner Representative upon request for Owner testing DEFINITIONS A. "Backfill" or "fill" means (a) material used to replace material removed during construction, or (b) the act of replacing or placing material during construction. B. "Backfill operation" or "fill operation" means the method and the activity required to fill surface depressions and excavations, or to construct fills to required grades. C. "Common fill" means fill or borrow materials which are naturally occurring and not meeting a specific gradation or classification. D. "Select fill" means fill or borrow materials which are naturally occurring, screened or graded, or mixed to meet a specific gradation or classification. E. "Subgrade" means those areas and surfaces upon which additional materials are to be placed under contract, or which are to be constructed or prepared for the future placement thereon of other materials. 03/30/

4 PART 2 - PRODUCTS 2.01 FILL MATERIAL FOR OVER-EXCAVATED AREAS A. Provide granular backfill materials meeting the requirements of "Select Fill" materials SELECT FILL MATERIALS A. Select Fill Material borrow is a coarse stone, gravel, or a crushed aggregate material which is free of shale, clay, friable materials, and/or debris. Unless otherwise specified in Geotechnical Report, Select Fill Material borrow shall be graded in accordance with ASTM C-136 within the following limits: Sieve Size % Passing 2 inches inch 40 to 80 No to 60 No to IMPORTED FILL MATERIALS A. Buildings - Refer to RB&G Geotechnical Investigation. B. Pavement areas- Refer to RB&G Geotechnical Investigation SUBBASE MATERIAL (PAVEMENT AREAS) A. Use granular subbase material that is untreated and be in conformance with UDOT Specifications. Unless specified otherwise, use "Granular Borrow" with a two (2) inch size maximum AGGREGATE BASE COURSE MATERIAL A. Use granular aggregate base course material that is untreated in conformance with UDOT Specifications. Unless specified otherwise, use "3/4 inch gradation." 03/30/

5 PART 3 - EXECUTION 3.01 PREPARATION A. Notify Owner Representative prior to starting any grading operations. B. Identify required lines, levels, contours and datum. C. Identify known underground utilities. Stake and flag locations. D. Identify and flag surface and aerial utilities. E. Maintain and protect existing utilities remaining which pass through the work area. F. Obtain copies of Referenced Geotechnical Investigation and become familiar with site preparation recommendations EXCAVATION A. Excavate all cut areas to the grades shown on the Plans. B. Excavate all areas that have excessive moisture content and cannot be compacted to the required densities. C. Correct unauthorized excavation at no cost to the Owner with Select Fill materials. D. Use excavated materials for constructing fills in areas designated on-site. Dispose excess materials at an offsite waste site PREPARATION FOR BACKFILLING A. Prepare subgrade as indicated in the RB&G Geotechnical Investigation CONSTRUCTION FILLS OR EMBANKMENTS A. Utilize excavated on-site materials to construct the stormwater detention ponds, landscaping fills, and non-structural fills to the elevations shown on the Plans. B. Do not use on-site materials within two feet (2') of the surface under structures or paved areas unless approved by the Owners Representative. C. Utilize imported fill materials to fill pavement or structural areas to the contours and elevations as shown on the Plans. Do not use frozen materials. D. Place and compact fill materials in continuous lifts not exceeding six inches (6") in depth, unless specifically allowed. 03/30/

6 E. Employ a placement method so as not to disturb or damage utilities in trenches. F. Maintain optimum moisture content of materials to attain required compaction density. G. Slope grade away from building pad as indicated on the plans. H. Make smooth changes in grade. Blend slopes into level areas. I. Leave stockpile areas in neat, evenly graded condition as directed by the Owners Representative IMPORTED STOCKPILED BORROW MATERIALS A. Import and stockpile select fill granular borrow for backfilling retaining walls at the locations and amounts as approved by the Owner Representative. B. Place and shape stockpiles as directed by the Owners Representative SPREADING AGGREGATE BASE OR SUBBASE A. Deliver imported aggregate base to the pavement areas as uniform mixtures and spread each layer in one operation. Avoid segregation and keep the base free from pockets of coarse or fine material. B. Deposit aggregate bases on the pavement area at a uniform quantity, which will provide the required compacted thickness. Maintain a moisture content throughout the material sufficient to obtain the required compaction TOLERANCES A. Finished grade of graded areas shall meet the following requirements: 3.08 COMPACTION TESTING 1. In paved areas including roadways, sidewalks, parking lots, etc., plus or minus 0.10 feet from the grades shown on the Plans. 2. In landscaped areas or similar areas, plus or minus two inches (±2"). 3. In the construction of the water detention ponds, plus or minus one inch (±1"). A. If tests indicate work does not meet specific compaction requirements, remove work, replace and retest at no cost to the Owner. B. One compaction test shall be taken by the Owner Representative for each 1,000 square yards/lift of materials placed. 03/30/

7 3.09 COMPACTION REQUIREMENTS A. Refer to the RB&G Geotechnical Investigation for compaction requirements. END OF SECTION 03/30/