SECTION STORM DRAIN

Transcription

1 PART 1 - GENERAL 1-01 SECTION INCLUDED A. Furnishing and installing storm drainage facilities, including pipe, cleanout, manhole structures and inlet structures RELATED SECTIONS A. Division 00 Contract General Conditions. B. Section Temporary Facilities. C. Section Clearing and Demoloition. D. Section Soil Materials. E. Section Trench Excavation and Backfilling. F. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 01 Specifications sections, apply to the work of this section REFERENCES A. ANSI/ASTM C76 Reinforced Concrete Culvert, Storm Drain, and Sewer Pipe. B. ANSI/ASTM C443 Joints for Circular Concrete Sewer and Culvert Pipe, using rubber gaskets. C. ANSI/ASTM C478 Precast Reinforced Concrete Manhole Sections. D. California Test Method No. 216 (Dry Method) SUBMITTALS A. Submit under provisions of Division 00 Contract General Conditions. B. Certificates of compliance for material. C. Product Data: Provide data indicating pipe, accessories, and associated equipment to be furnished. D. Manufacturer s Installation Instructions: Indicate special procedures required to install products supplied COORDINATION A. Coordinate work with Owner personnel. B. Verify that the location of existing utilities have been indicated at work site by utility authorities and Owner personnel. CHILDREN S WATER PLAY AREA PAGE 1

2 AGE IMPROVEMENTS 1-06 EXISTING UTILITIES A. The Engineer has indicated on the plans the location of all known existing utility facilities within the work area. The location of said facilities shall be considered approximate only, until exposed by the Contractor. B. Service laterals have been shown where information was available. The location of said facilities shall be considered approximate only, until exposed by the Contractor. C. Contractor shall verify all utilities within the work area, including using hand method. Contractor shall protect all existing utilities not designated to be removed. D. Maintain all existing utility mains and service lines in constant service during construction of the work PROJECT RECORD DOCUMENTS: A. Submit under provisions of Section B. Accurately record actual locations of utilities encountered. PART 2 - PRODUCTS 2-01 MATERIALS A. Reinforced Concrete Pipe for pipe larger than 12 : ANSI/ASTM C76, Class 4, with rubber gasket joints per ANSI/ASTM C443. B. Storm drainage sewer pipeline shall by polyvinyl chloride (PVC) pipe for storm sewer conforming to ASTM designation 3034, SDR 35 for pipe 12 or less. C. Storm drain manhole, frame and cover shall be as per detail drawing. D. Cast in Place Concrete: Per Section E. Mortar: Composed of one part, by weight, Portland cement (Type II low alkali per ASTM C150), 2 parts, by weight, sand, and water. F. Storm drain inlets shall be Dura Drain P-6, or approved equal. G. Soil Fill for Concrete Pipe Bedding Envelope: Type B or C per Section H. Cleanout shall be constructed as per detail drawing. IMPROVEMENTS CHILDREN S WATER PLAY AREA SUMMARY OF WORK PAGE 2 09/12/14

3 PART 3 - EXECUTION 3-01 EXAMINATION A. Verify site conditions. Locate, identify, and protect existing above and below grade utilities from damage PREPARATION A. Protect all improvements not authorized for removal. B. Employ equipment and methods appropriate to the work site. C. Identify location of proposed storm drainage facilities to be constructed. Expose connection points to existing system. D. Protect excavated areas from drainage inflow, and provide drainage to all excavated areas. Dewater as necessary. E. Comply with safety requirements as they pertain to excavations, per Section /3-01C EXCAVATION A. Excavate soil required to locate existing utilities and install the work, use hand method as necessary in congested area. B. Employ equipment and methods appropriate to the work site. C. Cut trenches just wide enough to enable installation and proper backfill and do not interfere with 45 degree bearing splay of foundations. When excavating through tree roots, cut roots by hand. D. Excavate trenches to provide the minimum cover required. E. Excavate trenches, pits, or holes bottoming in hardpan to a minimum of 6 inches below the grade for the bottom of the pipe and any couplings. F. In all trenches or excavation sites where a firm foundation is not encountered, such as soft, spongy, or otherwise unsuitable material, remove the material to a minimum of 12 inches, or to a depth determined by the Engineer, below the bottom of the proposed pipe or structure. G. Stockpile excavated material to be returned to trench adjacent thereto in location, which will not be detrimental to existing improvements, or pedestrian or vehicular traffic. Remove unsuitable or excess materials not being used, from site INSTALLATION AND BEDDING OF PIPE A. Install the pipe and fittings to the lines and grades shown on the construction plans. B. Install pipe and fittings in accordance with the manufacturer s recommendations. CHILDREN S WATER PLAY AREA PAGE 3

4 AGE IMPROVEMENTS C. Lay all pipe with bell end of pipe upgrade from structure to structure. D. Excavate suitable bell holes in the bedding material, so that the bells do not bear on the subgrade or bedding. E. Ensure that all joints are watertight. F. Bed concrete pipe in Type B or C soil envelope, and compact to a minimum of 85 percent relative compaction. Place and compact the bedding material under, around and over the pipe, filling the trench cavity and extending from the bottom of the trench (4 inches below the outside bottom of the pipe barrel) to a level 12 inches above the outside top of the pipe barrel INSTALLATION OF AGE STRUCTURES AND APPURTENANCES A. Install storm drainage structures as indicated on the construction plans, in accordance with the manufacturer s recommendations, and as specified herein. B. Construct cast-in-place concrete per Section C. Key top of poured-in-place concrete bases for structures to receive the tongue of precast riser sections. D. Joint precast manhole and structure riser sections with a minimum thickness of ½ inch of mortar per Section /2-01G to make a watertight joint. Neatly point the inside and outside of the joint. Set sections plumb. E. Construct cleanout per detail drawing BACKFILLING TO FINISH GRADE AND FINISH GRADING A. Backfill from bottom of the trench to pipe grade with Type B and C soil. B. After installation of pipes and appurtenances and backfill of pipe bedding material. C. Backfill trenches above pipe bedding material and to within 6 inches of finish subgrade with Type A, B, & C soils. Compact all soil backfill not exceeding 8 inches in uncompacted thickness. Maintain optimum moisture content of fill materials. D. Backfill final 6 inch thickness to finish subgrade in areas to receive concrete, asphaltconcrete, aggregate base, or other non-vegetative surface improvement, with Type B or C soils. E. Backfill final 6 inch thickness to finish subgrade in areas to receive sod, other vegetation, or bare soil with Type A soil. F. Obtain 85 percent relative compaction of backfill from bottom of backfill to a level of 2 feet below finish subgrade, and obtain minimum of 95 percent relative compaction of backfill in top 2 feet below finish subgrade, in areas to receive concrete, asphalt-concrete, aggregate base, or other non-vegetative surface improvement. G. Obtain minimum of 85 percent relative compaction of backfill in areas to receive sod, other vegetation, or bare soil. IMPROVEMENTS CHILDREN S WATER PLAY AREA SUMMARY OF WORK PAGE 4 09/12/14

5 3-07 TOLERANCES A. Pipe laying tolerances: 1. Above grade: Not to exceed 1/4 inch above planned grade. 2. Below grade: Not to exceed ½ inch below planned grade. 3. Alignment: Not to exceed 2 inches from planned alignment, if gradual and regular over a distance of 20 feet. B. Structure finish grade tolerance: Within ¼ inch of planned grade, but must match adjacent improvements FIELD QUALITY CONTROL A. Field inspection and testing will be performed as per Section B. Compaction testing of bedding and backfill will be performed in accordance with ASTM D C. If tests indicate work does not meet specified requirements, re-compact, or remove and replace, and retest. END OF SECTION CHILDREN S WATER PLAY AREA PAGE 5