necessary for closures, but no section shall be less than four (4) feet long. Expansion joints of the type called for in the plans shall be constructed to replace a dummy groove at a spacing of approximately one hundred (100) feet. When the gutter is placed next to a concrete pavement, expansion joints in the gutter shall be located opposite expansion joints in the pavement. When a gutter abuts a pavement or other structure, an expansion joint shall be placed between the gutter and the other structure. Forms shall not be removed within twenty-four (24) hours after concrete has been placed. Minor defects shall be repaired with mortar containing one part cement and two parts fine aggregate. The operations of depositing, compacting, and finishing the item shall be conducted in a workmanlike manner to build a satisfactory structure. If any section of concrete is found to be porous, other than minor defects plastered, or is otherwise defective, it shall be removed and replaced by the contractor without additional compensation. 754-3.3 BACKFILLING. After the concrete has set sufficiently, the spaces adjacent to the structure shall be refilled to the required elevation with material called for on the plans and compacted by mechanical equipment to at least ninety (90) percent density, as determined by CAA compaction control tests T-611 for the class of airport involved. 754-3.4 CLEANING AND RESTORATION OF SITE. After the backfill is completed, the contractor shall dispose of all surplus material, dirt, and rubbish from the site. Surplus dirt may be deposited in embankment, shoulders, or as ordered by the engineer. Except for paved areas of the airport, the contractor shall restore all disturbed areas to their original condition. After all work is completed, the contractor shall remove all tools and other equipment used by him, leaving the entire site free, clear, and in good condition. Performance of the work described in this section is not payable directly, but shall be considered as a subsidiary obligation of the contractor, covered under the contract unit price for the structure. METHOD OF MEASUREMENT 754-4.1 The footages to be paid for (structures of uniform cross section) shall be the number of linear feet, measured along the surface profile, of typical sections as shown on the plans for gutters, flumes, or paved ditches measured in place, completed and accepted. 754-4.2 The yardage to be paid for (irregular areas) shall be the number of square yards of concrete, measured along the surface profile, for all special sections and areas of irregular widths, as shown on the plans for gutters, flumes, or paved ditches, measured in place, completed and accepted. BASIS OF PAYMENT 754-5.1 The linear footage of gutters, ditches, or flumes, as provided for in paragraph 4.1, shall be paid for at the contract unit price per linear foot for "Concrete Paved Gutters, Ditches or Flumes," as called for in the bid schedule, which price and payment shall constitute full compensation for furnishing and placing all materials; for concrete; for reinforcing steel and expansion joint material; for forms, drainage openings, excavation, and subgrade; for refilling, tamping, and disposal of surplus materials; and for all labor, equipment, tools, and incidentals necessary to complete the item. 754-5.2 The square yardage, measured as described in paragraph 4.2, shall be paid for at the contract unit price per square yard for "Concrete Paved Gutters, Ditches or Flumes," as called for in the bid schedule, which price and payment shall constitute full compensation for furnishing and placing all materials; for concrete; for reinforcing steel and expansion joint material; for forms, drainage openings, excavation, and subgrade; for refilling, tamping, and disposal of surplus materials; and for all labor, equipment, tools, and incidentals necessary to complete the item. Payment will be made under: Item D-754-5.1 Concrete Paved Gutters, Ditches, or Flumesper linear foot. Item D-754-5.2 Concrete Paved Gutters, Ditches, or Flumes— per square yard. 763591°-48-27 ITEM D-755 GROUTED RUBBLE GUTTERS, DITCHES, AND FLUMES DESCRIPTION 755-1.1 This item shall consist of grouted rubble gutters, ditches, or flumes, constructed on a prepared bed in accordance with these specifications at the locations and in conformity with the lines, grades, and dimensions shown on the plans, or required by the engineer. MATERIALS 755-2.1 RUBBLE STONE. The stones shall be approved, sound, durable rubble stones, not less than six (6) inches and not more than eight (8) inches in thickness, with approximately flat top surfaces, with widths of not less than two (2) inches and lengths not less than six (6) inches. All stones shall be inspected before and after being laid. All rejected material shall be removed immediately from the work. 755-2.2 GROUT. The cement grout for filling the spaces between the stones shall be composed of one part Portland cement and two parts of fine aggregate by volume. The Portland cement shall conform to the requirements of A. S. T. M. Designation C-150, Type I. The sand shall conform to the requirements of A. A. S. H. O. Specification M-45. The water shall be clean and free from injurious amounts of sewage, oil, acid, strong alkalies, or vegetable matter. CONSTRUCTION METHODS 755-3.1 PREPARING SUBGRADE. Excavation shall be made to the required width and depth, and the subgrade upon which the item is to be built shall be compacted to a firm uniform grade. All soft and unsuitable material shall be removed and replaced with suitable approved material. When required, a layer of approved granular material, having the compacted thickness as shown on the plans, shall be placed to form a subbase. The underlying course shall be checked and accepted by the engineer before placing operations are started. 755-3.2 PLACING. The stones shall be bedded in the foundation in straight rows with each stone perpendicular to the finished surface. The stones shall be set in close contact, their flat surfaces up and their longest dimension at right angles to the centerline of the gutter, ditch, or flume. They shall break joints satisfactorily, and there shall be no interstices exceeding one (1) inch in width. The stones shall be rammed thoroughly until the surface is firm and conforms to the finished surface in grade, alignment, and cross section. Any sections having an irregular or uneven surface shall be taken up and relaid satisfactorily. 755-3.3 GROUTING. After the stones have been rammed into place and the surface is satisfactory, the spaces or voids between and around the stones shall be filled with cement grout. The cement grout shall be poured and broomed into the spaces between the stones, this operation being continued until the grout remains flush with the tops of the stones. The grout shall be of such consistency that it will flow readily into the spaces between the stones, but it must not be so wet that the solid matter separates from the water. 755-3.4 BACKFILLING. After the grout has set sufficiently, the spaces adjacent to the structure shall be refilled to the required elevation with material called for on the plans and compacted by mechanical equipment to at least ninety (90) percent density, as determined by CAA compaction control tests T-611 for the class of airport involved. 755-3.5 CLEANING AND RESTORATION OF SITE. After the backfill is completed, the contractor shall dispose of all surplus material, dirt, and rubbish from the site. Surplus dirt may be deposited in embankment, shoulders, or as ordered by the engineer. Except for paved areas of the airport, the contractor shall restore all disturbed areas to their original condition. After all work is completed, the contractor shall remove all tools and other equipment used by him, leaving the entire site free, clear, and in good condition. Performance of the work described in this section is not payable directly, but shall be considered as a subsidiary obligation of the contractor, covered under the contract unit price for the structure. METHOD OF MEASUREMENT 755-4.1 The yardage to be paid for shall be the number of square yards (widths and lengths measured along the surface profile) of grouted rubble gutters, ditches, or flumes, complete in place and accepted. BASIS OF PAYMENT 755-5.1 The yardage, as determined in paragraph 4.1, shall be paid for at the contract unit price per square yard for "Grouted Rubble Gutters, Ditches, or Flumes," as called for in the bid schedule, which price and payment shall constitute full compensation for furnishing and placing all materials; for excavating and refilling below the finished grade of the grouted rubble gutter, flume, or ditch; for all tamping; for all grouting; for disposing of surplus materials; and for all labor, equipment, tools, and incidentals necessary to complete the item. Payment will be made under: Item D-755-5.1 Grouted Rubble Gutters, Ditches, or Flumesper square yard. 901-1.1. This item shall consist of preparing the ground surface, furnishing and applying lime and fertilizer, furnishing and sowing seed, compacting, establishing, and repairing in accordance with this specification at the locations shown on the plans or as directed by the engineer. MATERIALS 901-2.1 SEED. The seed or seed mixture to be furnished, and the minimum percentage by weight of pure live seed of each species in each lot of seed, and the maximum percentage of weed seed shall be as stated in the special provisions. When the total percentage of pure live seed furnished is higher than the minimum required, the ratio of seed of the named species shall be approximately the same as that stated in the special provisions. All seed used shall be labeled in accordance with U. S. Department of Agriculture "Rules and Regulations Under the Federal Seed Act" in effect on the date of invitation for bids. All seed shall be furnished in standard containers, unless exception is granted by the engineer. Seed which has become wet, moldy, or otherwise damaged in transit or storage will not be acceptable. 901-2.2. LIME. Lime shall be ground limestone containing not less than eighty-five (85) percent of total carbonates, and shall be ground to such fineness that ninety (90) percent will pass through a No. 20 mesh sieve and fifty (50) percent will pass through a No. 100 mesh sieve. Coarser material will be acceptable, providing the rates of application are increased to provide not less than the minimum quantities stated in the special provisions on the basis of the two sieve requirements above. 901-2.3 FERTILIZER. Fertilizers shall be commercial carriers of available plant food elements or combinations thereof, either as inorganic or organic materials, as stated in the special provisions, and shall conform to the applicable State fertilizer laws. The fertilizer shall be uniform in composition, dry, and free-flowing material in condition for application by suitable equipment. The fertilizer shall be delivered in unopened bags or other convenient standard containers, each fully labeled with the manufacturer's guaranteed analysis. Any |