DIVISION 2 SITE WORK - Thieneman Construction

1 DIVISION 2 SITE WORK02000-1 SECTION 02000 SUBSURFACE EXPLORATION PART 1 GENERAL SCOPE A. Subsurface soil borings in the Construction sites have been made and are exhibited in the Geotechnical Investigation Report included in Appendix A for review by the contractor. B. Contractor should examine the site and make any additional subsurface investigations necessary to ascertain the conditions they might encounter. C. Any conclusions or decisions arrived at on the basis of soil borings shall be the responsibility of the Contractor. By displaying these boring logs, the Engineer does not indicate or infer that they represent underground conditions at other parts of the site D. Contractor is advised that ground water tables could change from those indicated in borings or observed at time of bidding.

2 Any such water table variation will not be considered as changed conditions by the Owner, and no extra costs will be allowed for such circumstances. E. Contractor shall visit the site and become thoroughly familiar with all site conditions prior to submitting a bid. No additional compensation will be considered for the bidder s failure to become thoroughly familiar with the site conditions. END OF SECTION 02200-1 SECTION 02200 EARTHWORK PART 1 GENERAL SECTION INCLUDES A. Excavating for building foundations. B. Excavating for slabs-on-grade, paving, and landscaping. C. Excavating for site structures. D. Removal of topsoil and subsoil. E. Cutting, grading, filling and rough contouring the site for site structures and building pads.

3 F. The Contractor shall provide the excavation, backfilling, and trenching necessary to accommodate the structures and piping as shown on the plans and as specified. RELATED SECTIONS A. Section 01400 - Quality Control: Testing fill compaction. B. Section 02055 - Demolition C. Section 02221 Trenching D. Section 02233 - Aggregate Materials. E. Section 02251 - Materials Testing DEFINITIONS A. Excavation consists of the removal of material encountered to subgrade elevations and the reuse or disposal of materials removed. B. Subgrade: The exposed surface of an excavation. C. Borrow: Soil material obtained off-site when sufficient approved soil materials are not available from excavations. Should the excavation material be insufficient to provide all of the fill required, the Contractor shall supply material from another source at no additional cost to the Owner.

4 D. Unauthorized excavation consists of removing materials beyond indicated subgrade elevations or dimensions without direction by the Engineer. Unauthorized excavation, as well as remedial work directed by the Engineer, shall be at the Contractor's expense. E. Structures: Building, footings, foundations, retaining walls, slabs tanks, curbs, mechanical and electrical appurtenances, or other man-made stationary feature constructed above or below ground surface. F. Utilities include on-site underground pipes, conduits, ducts, and cables, as well as 02200-2 underground services. GENERAL GUIDELINES A. Furnish all equipment, tools, materials, and labor to accomplish excavation, backfill, structural and area fill for buildings, pits and pipeline appurtenances.

5 B. Excavation for structures shall be to the dimensions and grades shown on plans. C. Contractor shall back-slope excavation or install suitable bracing and sheeting necessary to maintain open excavation in a safe secure condition. D. All backfill around buried tanks, vaults, etc. shall be clean, granular material. On-site material, subject to the approval of the Engineer, may be used where granular material is not specifically called for. E. All fill shall be material free of frozen material, wood, rocks, and rubbish. F. No fill shall be placed covering other work until such work has been inspected and approved. Where fill is required on both sides of a foundation or wall, the fill shall be placed simultaneously on each side.

6 Fill against building walls shall not be placed until the first floor slab has been poured and set, unless otherwise approved by the Engineer. Fill against other work shall be in a manner and at such time as not to endanger the stability or damage the work. No fill shall be placed against water bearing walls until they have been tested for water tightness. No fill shall be placed over snow or frozen material. G. Compaction under structures and in backfilled areas shall be accomplished by vibratory compaction equipment in lifts not exceeding 6 inches in loose depth. H. Prior to backfilling, all trash and rubble shall be removed from the excavation. I. Where compaction is specified, optimum density shall be determined by the methods set forth in ASTM D-698 and compaction, unless specified otherwise, shall be as follows: 1.

7 Area fill, outside of structure, 95% of optimum. 2. Backfill, outside of structure, 98% of optimum. 3. All fill under structures or slabs shall be not less than 100% of optimum. 4. Parking areas, drives, etc., 98% of optimum. J. Excess soils which are free from deleterious components may be used on site for area fill and grading. Area fill shall be compacted and graded to drain. K. Protection - All excavation shall be protected by bracing, sheeting, piling, or other acceptable means. The Contractor shall be responsible for protection of the excavation at all times. L. Dewatering - All excavations shall be kept dewatered by pumping equipment and drained to prohibit saturation of the subgrade.

8 Soft subgrade caused by inundation shall be dewatered or the soft material shall be removed to satisfactory bearing material and the area backfilled with Class B concrete or other approved material to bring the excavated area back to design elevations at no cost to the Owner. 02200-3 M. Unauthorized Excavation - Excavation shall be to the lines and grades indicated on the drawings. Unauthorized excavation below design elevations shall be backfilled with Class B concrete or other approved material to the design elevations at no cost to the Owner. N. Unsuitable Bearing Materials - Unsuitable bearing materials encountered at design elevations shall, upon written direction of the Engineer, be removed and the required bearing provided by the Contractor.

9 All authorized excavation below design elevations and all authorized corrective work such as backfilling with Class B concrete, driving of piling, compacted foundation, or by other acceptable means, will be paid for as specified in the "General Condition". O. Rock 1. Definition - The word "rock" wherever used as the name of an excavated material, shall mean boulders and solid masonry larger than 1/2 cubic yard in volume or solid ledge rock and masonry which required for its removal, drilling and blasting, wedging, sledging, barring, or breaking up with a power operated hand tool. Any material which can be excavated using a hand pick and shovel, power operated excavator, power operated backhoe, or power operated shovel shall not be defined as rock.

10 2. Blasting - No blasting of rock shall be done within 40 feet of pipes or structures without approval of the Engineer. Blasts shall be properly covered and the pipe or structure properly protected. Warning shall be given to all people in the immediate vicinity. Blasting shall be at the risk of the Contractor who shall be liable for all damages to people or property. Necessary permits shall be secured and paid for by the Contractor. SUBMITTALS A. Submit under the provisions of Section 01300. B. Test Reports: Contractor shall provide the following to the Engineer. 1. Laboratory analysis of each soil material proposed for fill and backfill from on-site and borrow sources.