A. This Section includes excavation support and protection systems.

Transcription

1 SECTION EXCAVATION SUPPORT AND PROTECTION PART 1 GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. 1.2 SUMMARY A. This Section includes excavation support and protection systems. B. Related Sections include the following: 1. Section Construction Facilities and Temporary Controls 2. Section Earthwork 1.3 PERFORMANCE REQUIREMENTS A. Design, provide, monitor, and maintain an anchored and braced excavation support and protection system capable of resisting soil and hydrostatic pressure and supporting sidewalls of excavations. 1. Work includes removing excavation support and protection systems when no longer needed. 2. Prevent surface water from entering excavations by grading, dikes, or other means. 3. Install excavation support and protection systems without damaging existing trees, buildings, pavements, and other improvements adjacent to excavation. 1.4 SUBMITTALS A. Shop Drawings: Prepared by or under the supervision of a qualified professional engineer for excavation support and protection systems. System design and calculations must be acceptable to authorities having jurisdiction. 1. Include Shop Drawings signed and sealed by the qualified professional engineer responsible for their preparation. B. Qualification Data: For firms and persons specified in "Quality Assurance" Article to demonstrate their capabilities and experience. Include lists of completed projects with project names and addresses, names and addresses of architects and owners, and other information specified. C. Photographs or videotape, sufficiently detailed, of existing conditions of adjoining construction and site improvements that might be misconstrued as damage caused by excavation support and protection systems. 1.5 QUALITY ASSURANCE A. Installer Qualifications: Engage an experienced installer to assume engineering responsibility and perform work of this Section who has specialized in installing excavation support and Project # T Excavation Support and Protection

2 protection systems similar to those required for this Project and with a record of successful inservice performance. B. Professional Engineer Qualifications: A professional engineer who is legally qualified to practice in the State of Missouri and who is experienced in providing engineering services for designing excavation support and protection systems that are similar to those indicated for this Project in material, design, and extent. 1. Engineering Responsibility: Engage a qualified professional engineer to prepare or supervise the preparation of data for the excavation support and protection system including drawings and comprehensive engineering analysis that shows the system's compliance with specified requirements. 1.6 PROJECT CONDITIONS A. Existing Utilities: Ensure locate is performed for the existing utilities prior to initiating work. Do not interrupt utilities serving facilities occupied by the Owner or others unless permitted in writing by the Owner and then only after arranging to provide temporary utility services according to requirements indicated. PART 2 PRODUCTS 2.1 MATERIALS A. Materials need not be new but must be in serviceable condition. B. Structural Steel: ASTM A 36. C. Steel Sheet Piling: ASTM A 328 or ASTM A 572. D. Wood Lagging: Lumber, mixed hardwood, nominal rough thickness of 3 inches. PART 3 EXECUTION 3.1 PREPARATION A. Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards that could develop during excavation support and protection system operations. B. Install excavation support and protection systems to ensure minimum interference with roads, streets, walks, and other adjacent occupied and used facilities. C. Locate excavation support and protection systems clear of permanent construction and to permit forming and finishing of concrete surfaces. D. Monitor excavation support and protection systems daily during excavation progress and for as long as excavation remains open. Promptly correct bulges, breakage, or other evidence of movement to ensure excavation support and protection systems remain stable. E. Promptly repair damages to adjacent facilities caused by installing excavation support and protection systems. Project # T Excavation Support and Protection

3 3.2 REMOVAL AND REPAIRS A. Remove excavation support and protection systems when construction has progressed sufficiently to support excavation and bear soil and hydrostatic pressures. Remove in stages to avoid disturbing underlying soils and damaging structures, pavements, facilities, and utilities. 1. Repair or replace, as approved by Owner, adjacent work damaged or displaced by removing excavation support and protection systems. 2. Install the gypsum wallboard in accordance with the Drawings and in accordance with ASTM C-840, with the separate boards in moderate contract, not forced into place. 3. At internal and external corners, conceal the cut edges of the boards by overlapping covered edges of the butted boards. 4. Stagger the boards so that the corners of an four boards will not meet at a common point except in vertical corners. PART 4 MEASUREMENT 4.1 MEASUREMENT A. No direct measurement or payment will be made for excavation support and protection, the cost of which shall be incidental to the cost of other items of work. END OF SECTION Project # T Excavation Support and Protection

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5 SECTION SITE CLEARING PART 1 GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. 1.2 SUMMARY A. This Section includes the following: 1. Protecting existing trees and vegetation to remain. 2. Removing trees and other vegetation. 3. Clearing and grubbing. 4. Topsoil stripping. B. Related Sections include the following: 1. Section Construction Facilities and Temporary Controls 2. Section Earthwork 3. Section Excavation Support and Protection 4. Section Lawns and Grasses 1.3 DEFINITIONS A. Topsoil: Natural or cultivated surface-soli layer containing organic matter and sand, silt, and clay particles; friable, pervious, and black or a darker shade of brown, gray, or red than underlying subsoil; reasonably free subsoil, clay lumps, gravel and other objects, and other objects more than 2 inches in diameter; and free of weeds, roots, and other deleterious materials. B. Interfering or Objectionable Material: Trash, rubbish, demolition debris; vegetation and other organic matter, weather alive, dead, or decaying; topsoil. C. Clearing: Removal of interfering or objectionable material lying on or protruding above the ground surface. Includes the removal of bushes and trees. D. Grubbing: Removal of vegetation and other organic matter including stumps, buried logs, and roots. E. Stripping: Removal of topsoil. F. Project Limits: Areas shown within the construction limits indicated on the drawings. Project # T Site Clearing

6 G. Remove: Remove and legally dispose of items except those indicated to be installed, salvaged, or to remain the Owner s property. H. Remove and Salvage: Items indicated to be removed and salvaged remain the Owner s property. Remove and clean, and pack or crate items to protect against damage. Identify contents of containers and deliver to Owner s designated storage area. I. Remove and Reinstall: Remove items indicated; clean, service, and otherwise prepare them for reuse; store and protect against damage. Reinstall items in the same locations or in locations indicated. J. Remove and Replace: Remove items indicated, legally dispose of, and replace with new as specified. Replacement items shall be new construction meeting the materials, fabrication, assembly, and installation requirements of similar specified new construction. If details are not specified for the new construction, match existing construction with equal replacement using new materials. K. Existing to Remain: Protect construction indicated to remain against damage and soiling during selective demolition. When permitted by the Owner, items may be removed to a suitable, protected storage location during selective demolition and then cleaned and reinstalled in their original locations. 1.4 MATERIALS OWNERSHIP A. Except for items or materials indicated to be reused, salvaged, reinstalled, or otherwise indicated to remain the Owner s property, demolished materials shall become the Contractor s property and shall be removed from the site with further disposition at the Contractor s option. 1.5 SUBMITTALS A. Photographs or videotape, sufficiently detailed, of existing conditions of trees and plantings, adjoining construction and site improvements that might be misconstrued as damage caused by site clearing. B. Record Drawings: 1. Identify and accurately locate utilities and other subsurface structural, electrical, and mechanical conditions. 1.6 QUALITY ASSURANCE A. Obtain Owner s approval of staked clearing, grubbing, and stripping limits, prior to commencing clearing, grubbing, and stripping. Project # T Site Clearing

7 1.7 SCHEDULING AND SEQUENCING A. Prepare site only after site inspection and adequate erosion and sediment controls are in place. Limit areas exposed uncontrolled to erosion during installation of temporary erosion and sediment controls. 1.8 PROJECT CONDITIONS A. Traffic: Minimize interference with adjoining roads, streets, walks, and other adjacent occupied or used facilities during site-clearing operations. 1. Do not close or obstruct streets, walks, or other adjacent occupied or used facilities without permission from the Owner and authorities having jurisdiction. 2. Provide alternate routes around closed or obstructed traffic ways in accordance with project traffic control/construction phasing plans or as approved by Owner or authorities having jurisdiction. B. Salvable Improvements: Carefully remove items indicated to be salvaged and store on Owner s premises where indicated. C. Notify utility locator service for area where Project is located before site clearing. Do not initiate work until utility locate has been completed. PART 3 EXECUTION 3.1 PREPARATION A. Provide erosion-control measures to prevent soil erosion and discharge of soilbearing water runoff or airborne dust to adjacent surfaces. B. Locate and clearly flag trees and vegetation to remain or to be relocated. C. Protect existing site improvements to remain from drainage during construction. 3.2 UTILITIES 1. Restore damaged improvements to their original condition, as acceptable to Owner. A. Existing Utilities: Do not interrupt utilities serving facilities occupied by Owner or others unless permitted under the following conditions and then only arranging to provide temporary utility services according to requirements indicated: 1. Notify owner not less than two days in advance of proposed utility interruptions. 2. Do not proceed with utility interruptions without Owner s written permission. Project # T Site Clearing

8 3.4 CLEARING AND GRUBBING A. Remove obstructions, trees, shrubs, grass, and other vegetation to permit installation of new construction. Removal includes digging out stumps and obstructions and grubbing roots. 3.5 TOPSOIL STRIPPING A. Remove sod and grass before stripping topsoil. B. Strip topsoil to whatever depths are encountered in a manner to prevent intermingling with underlying subsoil or other waste materials. 1. Strip surface soil of unsuitable topsoil, including trash, debris, weeds, roots, and other waste materials. C. Remove and dispose of topsoil materials. 3.6 SITE IMPROVEMENTS A. Remove existing above and below-grade improvements as indicated and as necessary to facilitate new construction. B. Remove slabs, paving, curbs, gutters, and aggregate base as indicated. 3.7 DISPOSAL 1. Unless existing full-depth joints coincide with line of demolition, neatly saw-cut length of existing pavement to remain before removing existing pavement. Saw-cut existing pavement full depth, with vertical, faces. A. Disposal: Remove surplus soil material, unsuitable topsoil, obstructions, demolished materials, and waste materials, including trash and debris, and in compliance with all jurisdictional codes and ordinances off Owner s property. END OF SECTION Project # T Site Clearing

9 SECTION EARTHWORK PART 1 - GENERAL 1.2 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. 1.1 SUMMARY Provide all materials, labor and accessories for the complete and proper installation of earthmoving in accordance with the highest industry standards. B. Section Includes: 1. Preparing subgrades for walks, turf and grasses and plants. 2. Subbase course for concrete walks. 3. Subbase course and base course for asphalt paving. 4. Subsurface drainage backfill for walls to accommodate waterproofing. 5. Excavating and backfilling. C. Related Sections: 1. Section Site Clearing 2. Section Excavation Support and Protection 3. Section Lawn and Grasses 1.2 DEFINITIONS A. Backfill: Soil material or controlled low-strength material used to fill an excavation. B. Base Course: Aggregate layer placed between the subbase course and hot-mix asphalt paving. C. Bedding Course: Aggregate layer placed over the excavated subgrade in a trench before laying pipe. D. Borrow Soil: Satisfactory soil imported from off-site for use as fill or backfill. E. Drainage Course: Aggregate layer supporting the slab-on-grade that also minimizes upward capillary flow of pore water. F. Excavation: Removal of material encountered above subgrade elevations.

10 1. Additional Excavation: Excavation below subgrade elevations or beyond pay limits defined in the drawings and/or specifications as directed by Owner. Additional excavation and replacement material will be paid for according to Contract provisions for changes in the Work. 2. Unauthorized Excavation: Excavation below subgrade elevations or beyond indicated lines and dimensions without direction by Owner, shall be without additional compensation. G. Fill: Soil materials used to raise existing grades. H. Rock: Rock material in beds, ledges, unstratified masses, conglomerate deposits, and boulders of rock material that exceed 1 cu. yd. for bulk excavation or 3/4 cu. yd. for footing, trench, and pit excavation that cannot be removed by rock-excavating equipment equivalent to the following in size and performance ratings, without systematic drilling, ram hammering, ripping, or blasting, when permitted: I. Structures: Buildings, footings, foundations, retaining walls, slabs, tanks, curbs, mechanical and electrical appurtenances, or other man-made stationary features constructed above or below the ground surface. J. Subbase Course: Aggregate layer placed between the subgrade and base course for hot-mix asphalt pavement, or aggregate layer placed between the subgrade and a cement concrete pavement or a cement concrete or hot-mix asphalt walk. K. Subgrade: Surface or elevation remaining after completing excavation, or top surface of a fill or backfill immediately below subbase, drainage fill, drainage course, or topsoil materials. L. Utilities include on-site underground pipes, conduits, ducts, and cables as well as underground services within buildings. M. Relative Compaction: 1. Ratio, in percent, of as-compacted field dry density to laboratory maximum dry density as determined in accordance with ASTM D1557. N. Optimum Moisture Content: 1. Determined in accordance with ASTM Standard specified to determine maximum dry density for relative compaction. 2. Determine field moisture content on basis of fraction passing ¾-inch sieve. 1.4 PREINSTALLATION MEETINGS A. Preinstallation Conference: Conduct preexcavation conference at Project site. 1. Review methods and procedures related to earthmoving, including, but not limited to, the following: Project # T Earthwork

11 a. Personnel and equipment needed to make progress and avoid delays. b. Coordination of Work with utility locator service. c. Coordination of Work and equipment movement with the locations of tree and plant-protection zones. d. Extent of trenching by hand or with air spade. e. Field quality control. 1.3 ACTION SUBMITTALS A. Product Data: For each type of the following manufactured products required: 1. Geotextiles. 2. Controlled low-strength material, including design mixture. 3. Warning tapes. B. Samples for Verification: For the following products, in sizes indicated below: 1. Geotextile: 12 by 12 inches. 2. Warning Tape: 12 inches long; of each color. C. Preexcavation Photographs or Videotape: Show existing conditions of adjoining construction and site improvements, including finish surfaces that might be misconstrued as damage caused by earth-moving operations. Submit before earth moving begins. 1.4 QUALITY ASSURANCE A. Geotechnical Testing Agency Qualifications: Qualified according to ASTM E 329 and ASTM D 3740 for testing indicated. B. Notify Owner when: 1. Structure is ready for backfilling, and whenever backfilling operations are resumed after a period of inactivity. 2. Soft or loose subgrade materials are encountered wherever embankment or site fill is to be placed. 3. Fill material appears to be deviating from Specifications. 1.5 PROJECT CONDITIONS A. Traffic: Minimize interference with adjoining roads, streets, walks, and other adjacent occupied or used facilities during earth-moving operations. 1. Do not close or obstruct streets, walks, or other adjacent occupied or used facilities without permission from Owner and authorities having jurisdiction. 2. Provide alternate routes around closed or obstructed traffic ways if required by Owner or authorities having jurisdiction. B. Utility Locator Service: Notify utility locator service "Missouri One Call" for area where Project is located before beginning earth-moving operations. Project # T Earthwork

12 C. Do not commence earth-moving operations until temporary silt fencing and erosion and sedimentation control measures. Section "Site Clearing" are in place. D. Do not commence earth-moving operations until plant-protection measures are in place. E. The following practices are prohibited within protection zones: 1. Storage of construction materials, debris, or excavated material. 2. Parking vehicles or equipment. 3. Foot traffic. 4. Erection of sheds or structures. 5. Impoundment of water. 6. Excavation or other digging unless otherwise indicated. 7. Attachment of signs to or wrapping materials around trees or plants unless otherwise indicated. F. Do not direct vehicle or equipment exhaust towards protection zones. G. Prohibit heat sources, flames, ignition sources, and smoking within or near protection zones. PART 2 - PRODUCTS 2.1 SOIL MATERIALS A. General: Provide borrow soil materials when sufficient satisfactory soil materials are not available from excavations. B. Satisfactory Soils: Soil Classification Groups GW, GP, GM, SW, SP, and SM according to ASTM D 2487, or a combination of these groups; free of rock or gravel larger than 2 inches in any dimension, debris, waste, frozen materials, vegetation, and other deleterious matter. C. Unsatisfactory Soils: Soil Classification Groups GC, SC, CL, ML, OL, CH, MH, OH, and PT according to ASTM D 2487, or a combination of these groups. 1. Unsatisfactory soils also include satisfactory soils not maintained within 2 percent of optimum moisture content at time of compaction. D. Sand: ASTM C 33/C 33M; fine aggregate. E. Impervious Fill: Clayey gravel and sand mixture capable of compacting to a dense state. F. Backfill and Fill: Satisfactory soil materials. G. Granular Backfill: ¾ inch minus crushed limestone and screenings complying with Part 2, Section K, Designation MSD 3-Backfill, Metropolitan St. Louis Sewer District Standard Construction Specifications for Sewers and Drainage Facilities, latest edition. H. Base/Subgrade: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; complying with the requirements for Type 1Aggregate, of Project # T Earthwork

13 Section 1007 Aggregate for Base of the Missouri Department of Transportation Standard Specifications for Highway Construction, latest edition. I. Topsoil: Natural, fertile, and friable soil. Clean and free of roots, plants, sods, stones, clay lumps, and other extraneous materials. Topsoil shall be silty clay loam approximating the following composition: 1. ph Range: Organic Matter Content: Minimum 4% 3. Mechanical Analysis: Any imported soil shall be similar in concentration of sand, silt, and clay as the existing subsoil. 4. Chemical Analysis: Magnesium Minimum 100 lbs./acre Nitrogen Phosphorus Potassium Soluble Salts Minimum 40 lbs./acre Minimum 100 lbs./acre Minimum 100 lbs./acre Not to Exceed 900ppm 2.2 GEOTEXTILES A. Subsurface Drainage/Separation Geotextile: Nonwoven needle-punched geotextile, manufactured for subsurface drainage/separation applications, made from polypropylene fibers; with elongation greater than 50 percent; complying with AASHTO M 288 and the following, measured per test methods referenced: 1. Survivability: Class 3; AASHTO M Survivability: As follows: a. Grab Tensile Strength: 120 lbs. ASTM D b. Tear Strength: 50 lbs. ASTM D c. Puncture Strength: 310 lbs. ASTM D Apparent Opening Size: No. 70 sieve, maximum; ASTM D Permittivity: 1.7 per second, minimum; ASTM D UV Stability: 70 percent after 500 hours' exposure; ASTM D ACCESSORIES A. Warning Tape: Acid and alkali-resistant, polyethylene film warning tape manufactured for marking and identifying underground utilities, 6 inches wide and 4 mils thick, continuously inscribed with a description of the utility; colored as follows: 1. Red: Electric. Project # T Earthwork

14 2. Yellow: Gas, oil, steam, and dangerous materials. 3. Orange: Telephone and other communications. 4. Blue: Water systems. 5. Green: Sewer systems. PART 3 - EXECUTION 3.1 PREPARATION A. Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earth-moving operations. B. Protect and maintain erosion and sedimentation controls during earth-moving operations. C. Protect subgrades and foundation soils from freezing temperatures and frost. Remove temporary protection before placing subsequent materials. 3.2 DEWATERING A. Prevent surface water and ground water from entering excavations, from ponding on prepared subgrades, and from flooding Project site and surrounding area. B. Protect subgrades from softening, undermining, washout, and damage by rain or water accumulation. 1. Reroute surface water runoff away from excavated areas. Do not allow water to accumulate in excavations. Do not use excavated trenches as temporary drainage ditches. 3.3 EXPLOSIVES A. Explosives: Do not use explosives. 3.4 EXCAVATION, GENERAL A. Unclassified Excavation: Excavate to subgrade elevations regardless of the character of surface and subsurface conditions encountered. Unclassified excavated materials may include rock, soil materials, and obstructions. No changes in the Contract Sum or the Contract Time will be authorized for rock excavation or removal of obstructions. 1. If excavated materials intended for fill and backfill include unsatisfactory soil materials and rock, replace with satisfactory soil materials. B. Excavations at Edges of Tree and Plant-Protection Zones: 1. Excavate by hand or with an air spade to indicated lines, cross sections, elevations, and subgrades. If excavating by hand, use narrow-tine spading forks to comb soil and expose Project # T Earthwork

15 roots. Do not break, tear, or chop exposed roots. Do not use mechanical equipment that rips, tears, or pulls roots. 3.5 EXCAVATION FOR WALKS AND PAVEMENTS A. Excavate surfaces under walks and pavements to indicated lines, cross sections, elevations, and subgrades. 3.6 SUBGRADE APPROVAL A. Notify Architect/Owner when excavations have reached required subgrade. If Architect/Owner determines that unsatisfactory soil is present, continue excavation and replace with compacted backfill or fill material as directed. 3.7 STORAGE OF SOIL MATERIALS A. Stockpile borrow soil materials and excavated satisfactory soil materials without intermixing. Place, grade, and shape stockpiles to drain surface water. Cover to prevent windblown dust. 1. Stockpile soil materials away from edge of excavations. Do not store within drip line of remaining trees. 3.8 BACKFILL A. Place and compact backfill in excavations promptly, but not before completing the following: 1. Construction below finish grade including, where applicable, subdrainage, dampproofing, waterproofing, and perimeter insulation. 2. Surveying locations of underground utilities for Record Documents, if existing. 3. Removing trash and debris. 4. Removing temporary shoring, bracing, and sheeting. B. Place backfill on subgrades free of mud, frost, snow, or ice. 3.9 SOIL FILL A. Plow, scarify, bench, or break up sloped surfaces steeper than 1 vertical to 4 horizontal so fill material will bond with existing material. B. Place and compact fill material in layers to required elevations as follows: 1. Under grass and planted areas, use satisfactory soil material. 2. Under walks and pavements, use satisfactory soil material. C. Place soil fill on subgrades free of mud, frost, snow, or ice. Project # T Earthwork

16 3.10 SOIL MOISTURE CONTROL A. Uniformly moisten or aerate subgrade and each subsequent fill or backfill soil layer before compaction to within 2 percent of optimum moisture content. 1. Do not place backfill or fill soil material on surfaces that are muddy, frozen, or contain frost or ice. 2. Remove and replace, or scarify and air dry, otherwise satisfactory soil material that exceeds optimum moisture content by 2 percent and is too wet to compact to specified dry unit weight COMPACTION OF SOIL BACKFILLS AND FILLS A. Place backfill and fill soil materials in layers not more than 8 inches in loose depth for material compacted by heavy compaction equipment and not more than 4 inches in loose depth for material compacted by hand-operated tampers. B. Place backfill and fill soil materials evenly as required to required elevations and uniformly along the full length of area to be backfilled. C. Compact soil materials to not less than the following percentages of maximum dry unit weight according to ASTM D 698: 1. Under walkways, scarify and recompact top 6 inches below subgrade and compact each layer of backfill or fill soil material at 95 percent P.D. 2. Under turf or unpaved areas, scarify and recompact top 6 inches below subgrade and compact each layer of backfill or fill soil material at 85 percent P.D GRADING A. General: Uniformly grade areas to a smooth surface, free of irregular surface changes. Comply with compaction requirements and grade to cross sections, lines, and elevations indicated. 1. Provide a smooth transition between adjacent existing grades and new grades. 2. Cut out soft spots, fill low spots, and trim high spots to comply with required surface tolerances. B. Site Grading: Slope grades to direct water away from buildings and to prevent ponding. Finish subgrades to elevations required to achieve indicated finish elevations, within the following subgrade tolerances: 1. Turf or Unpaved Areas: Plus or minus 1 inch. 2. Walks: Plus or minus 1/2 inch SUBSURFACE DRAINAGE A. Subsurface Drain: Place subsurface drainage geotextile around perimeter of subdrainage trench. Place a 6-inch course of filter material on subsurface drainage geotextile to support subdrainage Project # T Earthwork

17 pipe. Encase subdrainage pipe in a minimum of 12 inches of filter material, placed in compacted layers 6 inches thick, and wrap in subsurface drainage geotextile, overlapping sides and ends at least 6 inches. 1. Compact each filter material layer to 85 percent of maximum dry unit weight according to ASTM D 698. B. Drainage Backfill: Place and compact filter material over subsurface drain, in width indicated, to within 12 inches of final subgrade, in compacted layers 6 inches thick. Overlay drainage backfill with one layer of subsurface drainage geotextile, overlapping sides and ends at least 6 inches. 1. Compact each filter material layer to 85 percent of maximum dry unit weight according to ASTM D SUBBASE AND BASE COURSES UNDER PAVEMENTS AND WALKS A. Place subbase course and base course on subgrades free of mud, frost, snow, or ice. B. On prepared subgrade, place subbase course and base course under pavements and walks as follows: 1. Install separation geotextile on prepared subgrade according to manufacturer's written instructions, overlapping sides and ends. 2. Place base course material over subbase course under hot-mix asphalt pavement. 3. Shape subbase course and base course to required crown elevations and cross-slope grades. 4. Place subbase course and base course 6 inches or less in compacted thickness in a single layer. 5. Place subbase course and base course that exceeds 6 inches in compacted thickness in layers of equal thickness, with no compacted layer more than 6 inches thick or less than 3 inches thick. 6. Compact subbase course and base course at optimum moisture content to required grades, lines, cross sections, and thickness to not less than 95 percent of maximum dry unit weight according to ASTM D 698, ASTM D FIELD QUALITY CONTROL A. Special Inspections: Owner will engage a qualified special inspector to perform the following special inspections: 1. Determine prior to placement of fill that site has been prepared in compliance with requirements. 2. Determine that fill material classification and maximum lift thickness comply with requirements. 3. Determine, during placement and compaction, that in-place density of compacted fill complies with requirements. Project # T Earthwork

18 B. Testing Agency: Owner will engage a qualified geotechnical engineering testing agency to perform tests and inspections. C. Allow testing agency to inspect and test subgrades and each fill or backfill layer. Proceed with subsequent earth moving only after test results for previously completed work comply with requirements. D. Testing agency will test compaction of soils in place according to ASTM D 1556, ASTM D 2167, ASTM D 2937, and ASTM D 6938, as applicable. Tests will be performed at the following locations and frequencies: 1. Paved Sidewalk/Asphalt Areas: At subgrade and at each compacted fill and backfill layer, at least one test for every 2000 sq. ft. 2. Foundation Wall Backfill: At each compacted backfill layer, at least one test for every 100 feet or less of wall length but no fewer than two tests. 3. Planter Backfill: At each compacted initial and final backfill layer, at least one test for every 150 feet or less of trench length but no fewer than two tests. E. When testing agency reports that subgrades, fills, or backfills have not achieved degree of compaction specified, scarify and moisten or aerate, or remove and replace soil materials to depth required; recompact and retest until specified compaction is obtained PROTECTION A. Protecting Graded Areas: Protect newly graded areas from traffic, freezing, and erosion. Keep free of trash and debris. B. Repair and reestablish grades to specified tolerances where completed or partially completed surfaces become eroded, rutted, settled, or where they lose compaction due to subsequent construction operations or weather conditions. 1. Scarify or remove and replace soil material to depth as directed by Architect; reshape and recompact. C. Where settling occurs before Project correction period elapses, remove finished surfacing, backfill with additional soil material, compact, and reconstruct surfacing. 1. Restore appearance, quality, and condition of finished surfacing to match adjacent work, and eliminate evidence of restoration to greatest extent possible DISPOSAL OF SURPLUS AND WASTE MATERIALS A. Remove surplus satisfactory soil and waste materials, including unsatisfactory soil, trash, and debris, and legally dispose of them off Owner's property. END OF SECTION Project # T Earthwork

19 SECTION SEDIMENT AND EROSION CONTROL PART 1 GENERAL 1.1 WORK INCLUDED IN THIS SECTION A. Provide all materials, labor and accessories for the complete and proper installation of sediment erosion control products for the minimization of soil loss from the site during construction to the highest industry standard. B. Related Work in Other Sections: 1. Section Site Clearing 2. Section Earthwork 3. Section Lawns and Grasses 1.2 QUALITY ASSURANCE A. Qualifications of Workmen: Provide at least one person who shall be present at all times during execution of this portion of the work and who shall be thoroughly familiar with the type of materials being installed and the best methods for their installation and who shall direct all work performed under this Section. B. The publications listed below form a part of this specification to the extent referenced. The publications referred to in the text are basic designation only. The latest revision of the following standards shall apply to work hereunder. American Society for Testing and Materials (ASTM): 1. D 1777 Method for Measuring Thickness of Textile Materials. 2. D 1987 Test Method for Biological Clogging of Geotextile or Soil/Geotextile Filters. 3. D 3786 Test Method for Hydraulic Bursting Strength of Knitted Goods and 4. Nonwoven Fabrics: Diaphragm Bursting Strength Tester Method. 5. D 4354 Practice for Sampling of Geosynthetics for Testing. 6. D 4355 Test Method for Deterioration of Geotextiles from Exposure to Ultraviolet Light and Water (Xenon-Arc Type Apparatus). 7. D 4439 Terminology for Geotextiles. 8. D 4533 Test Method for Trapezoid Tearing Strength of Geotextiles. 9. D 4595 Test Method for Tensile Properties of Geotextiles by the Wide- Width Strip Method. 10. D 4632 Test Method for Grab Breaking Load and Elongation of Geotextiles. 11. D 4833 Test Method for Index Puncture Resistance of Geotextiles, Geomembranes, and Related Products. 12. D 4873 Guide for Identification, Storage, and Handling of Geotextiles. C. All work to comply with regional land disturbance guidelines. Contractor shall acquire a land disturbance permit and employ a special inspector per the requirements of the permit, if required. Project # T Sediment and Erosion Control

20 1.3 JOB CONDITIONS A. The Contractor shall employ Best Management Practice (BMP s) to minimize the transport of sediment and to control erosion. BMP s shall include but not be limited to the products and performance requirements described in this specification. All products shall be installed in accordance with the manufacturer s recommendations, unless modified herein. 1.4 SUBMITTALS A. Submit shop drawings and /or manufacturer s certification of the following: 1. Silt Fence. 2. High Density Polyethylene Pipe (HDPE) for sediment basins. 3. Erosion control blanket. 4. Receipts of temporary seed delivered to the site. PART 2 PRODUCTS 2.1 SILT FENCE A. American Excelsior, 850 Avenue H, East, Arlington, TX 76011, (800) B. Belton Industries, 1205 Humby Rd., Belton, SC 29627, (800) C. US Fabrics, 3904 Virginia Ave., Cincinnati, OH 45227, (800) HIGH DENSITY POLYETHYLENE (HDPE) PIPE A. Corrugated Polyethylene Pipe or approved equal, complying with ASTM F-405 (3 to 6 diameters) or ASTM F-667 (8 to 24 diameters). 2.3 STRAW BALES A. Bales of straw used as a means of controlling sedimentation. 2.4 TEMPORARY SEEDING A. Shall only be permitted by written authorization from the Owner. 1. Cereal Rye 2. Wheat 2.5 PERMANENT SEEDING A. See Section See Section Lawns and Grasses Project # T Sediment and Erosion Control

21 PART 3 PERFORMANCE 3.1 SILT FENCE A. Construction Requirements Silt fences shall be constructed to reduce the transport of sediment from or within the project limits. In addition: 1. Fences shall be maintained in a continuous fashion. 2. Silt fence shall be generally installed on the contour. 3. Fence posts shall be driven into the soil at least 24 inches. 4. The bottom portion of the silt fence shall be trenched into the soil to a minimum depth of 6 inches. 3.2 STRAW BALES A. Construction Requirements Straw bales shall be placed to reduce erosion and trap sediment. Straw bales shall be maintained until permanent vegetation is established. In addition: 1. Straw bales shall be maintained in a continuous fashion. 2. Bales shall generally be installed on the contour. 3. Bales shall be securely anchored with stakes driven at least 24 inches into the soil. 4. The bottom of bales shall be trenched into the soil to a depth of 6 inches. 5. Bales shall be backfilled after staking to prevent sediment from passing beneath bale. 3.3 TEMPORARY BERMS A. Construction Requirements Temporary berms shall be constructed around soil stockpile locations. B. Maintenance Requirements Sediment deposits shall be removed after each storm event. Deposits must be removed when they reach approximately three-fourths the height of the barrier. Sediment removal shall include removal and disposal in a location where it will not erode into construction areas or water courses. 3.4 TEMPORARY SEDIMENT BASINS A. Construction Requirements Sediment basins shall be used to trap and store sediment from the erosive areas. Proposed sediment basin layout and construction methods shall be submitted to the Owner/Architect for review and approval prior to installation. B. Maintenance Requirements Sediment deposits shall be removed when depth of sediment reaches three-fourths of the depth of the structure. The Sediment basins will be maintained until all disturbed areas draining into the structure have been satisfactorily stabilized and turf established to prevent erosion. The structure may then be backfilled, properly compacted, and seeded to permanent vegetation. Project # T Sediment and Erosion Control

22 3.5 MAINTENANCE A. All erosion and sedimentation control devices shall be maintained by the Contractor until such time that permanent turf has been established to such a level to prevent erosion and the transport of sediment. END OF SECTION Project # T Sediment and Erosion Control