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    SECTION 02721

    STORM DRAINAGE SYSTEMS

   PART 1 - GENERAL

   1.01 WORK INCLUDED

    A. Installation of storm drainage systems.

   1.02 RELATED SECTIONS

    A. Section 02222: Excavation

    B. Section 02223: Backfilling

    D. Section 03300: Cast-in-Place Concrete

   PART 2 - PRODUCTS

   2.01 REINFORCED CONCRETE PIPE (RCP)

    A. Culverts: AASHTO M-170 or ASTM C-76

    B. Elliptical Culverts: AASHTO M-207 or ASTM C-507

    C. Reinforced Low-Head: ASTM C-361

   2.02 CONCRETE MATERIALS

    A. Class "A" in accordance with Section 03300.

   2.03 BRICK

    A. AASHTO M-91 or ASTM C-32 for the grade specified.

    B. Clay or shale, Grade MS of MM.

    C. Test brick by AASHTO T-32.

   2.04 MASONRY CEMENT

    A. AASHTO M-150, ASTM C-91.

    B. Method of sampling and testing of masonry cement, when required, shall be by the methods of AASHTO:

    Sampling T-127

    Fineness T-192

    Normal Consistency T-129

    Soundness T-107

    Time of Setting T-154

    Specific Gravity T-133

    Staining Test T-105

    Comprehensive Strength T-106

    Plastic Consistency T-162

    Air Content T-137

    Mixing of Mortar T-162

    C. Fine Aggregate: AASHTO M-45 consisting of hard, strong, durable uncoated mineral or rock particles free from injurious amounts of organic or other deleterious substances.

    1. Sand for mortar shall be uniformly graded from coarse to fine within the following limits:

    Total Percent

    Sieve Size Passing by Weight

    8 100

    50 15 - 40

    100 0 - 10

    200 0 - 5

    2. Methods of test for fire aggregate, when required, shall be by the following methods of AASHTO:

    Sampling T-2

    Organic Impurities T-21

    Mortar Making Properties T-71

    Sieve Analysis T-27

    Material Passing 200 Sieve T-11

    D. Mix mortar in the following proportions:

    1. 1 part masonry cement

    2. 2 parts fine aggregate

    3. Hydrated lime not exceeding 10% of the cement used

    4. Water free of injurious substances, added to form a stiff workable paste.

   2.05 CASTINGS FOR FRAMES, GRATES AND COVERS

    A. Gray or Ductile Iron, conforming to ASTM A-48 Class 30 and A-536 Grade 65-45-12.

    B. Bituminous paint finish not affected by hot or cold weather.

    All shall conform to Metropolitan Nashville Department of Public Works.

   PART 3 - EXECUTION

   3.01 PREPARATION

    A. Prior to laying pipe, prepare a suitable bedding according to Section 02222.

    B. Before placing pipe in the trench, field inspect for cracks or other defects; remove defective pipe from the construction site.

    C. Swab the interior of the pipe to remove all undesirable material.

    D. Prepare the bell end and remove undesirable material from the gasket and gasket recess.

   3.02 INSTALLING STORM SEWER PIPE

    A. Lay pipe in a straight line on a uniform grade from structure to structure with the bell or groove end upgrade.

    B. Firmly support each section throughout its length and form a close concentric joint with the adjoining pipe.

    C. Make junctions and turns with standard or special fittings.

    D. Do not open up more trench at any time than pumping facilities are able to dewater.

    E. Whenever the work ceases, close the end of the pipe with a tight fitting plug or cover.

    F. Close all openings provided for future use and abandoned pipe with a tight fitting plug sealed to avoid leakage.

    G. When the pipe connects with structures, the exposed ends shall be placed or cut off flush with the interior of the structure and satisfactory connections made.

    H. Any pipe which is not in good alignment or which shows any undue settlement or damage shall be taken up and relaid without additional compensation.

    I. Laying pipe and sealing joints shall be a continuous operation.

    1. Seal all joints during the same day in which the pipe is laid.

    2. Construct the joints in such a manner that a watertight joint will result.

    J. Joints for rigid pipe:

    1. Portland cement mortar;

    2. Rubber gaskets; or

    3. Other types of joints recommended by the pipe manufacturer and approved.

    K. For mortar joints, the pipe ends shall be thoroughly cleaned and wetted with water before the joint is made. Place stiff mortar in the lower half of the bell or groove of the pipe already laid and on the upper half of the spigot or tongue of the section to be laid. Tightly join sections with their inner surfaces flush and even. Smoothly finish the inside of the joint and remove any surplus material. Protect the complete joints against rapid drying with suitable covering material.

    L. Install rubber ring gaskets to form a flexible watertight seal.

    M. When other type joints are permitted, install or construct in accordance with the recommended of the manufacturer.

    N. Firmly join flexible pipe by approved coupling bands.

    O. Inspect the pipe before any backfill is placed.

    P. When strutting or vertical elongation is required, it shall be performed in accordance with the details shown on the Plans.

    Q. Leave ties and struts in place until the embankment is completed, unless otherwise specified.

    R. As work progresses, clean the interior of all pipe in place.

    S. Make connections by constructing catchbasins, other structures, or by installing wyes or tees as shown on the Plans. Wyes and tees for future connections shall be installed as indicated.

   3.03 CAST-IN-PLACE CONCRETE CATCHBASINS

    A. Perform all concrete construction in accordance with Section 03300.

    B. Inverts: Class A concrete of the shapes indicated on the Plans and constructed to cause the least possible resistance flow. The shape of the inverts shall conform uniformly to inlet and outlet pipes with a smooth and uniform finish.

   3.04 BRICK CATCHBASINS

    A. Do not construct brick masonry in freezing weather nor when the bricks contain frost.

    B. Select brick for exposed surfaces, corners, etc., from brick approved for color and uniformity.

    C. All brick and the receiving bed shall be thoroughly cleaned and well moistened with water immediately before being laid.

    D. Lay all brick in freshly made mortar, in a substantial and workmanlike manner and true to the lines and grades indicated on the Plans.

    E. Arrange headers and stretchers to thoroughly bond the masonry and, unless otherwise indicated or directed, alternate headers and stretchers with consecutive courses breaking joints.

    F. Face joints shall be neatly stuck, using the weather joint.

    G. Finish joints properly as the laying of brick progresses with each not less than 1/4" nor more than 1/2" in thickness.

    H. Do not use spalls or bats except in shaping around irregular openings or when unavoidable to finish out a course, in which case, place a full brick at the corner and the bat in the interior of the course.

    I. The surface of brick masonry against which embankment or backfill is to be placed shall be neatly plastered with mortar to a thickness of not less than 1/2", and the mortar shall be finished to a true and uniform surface. The mortar shall be protected and kept wet for 48 hours after completion.

   3.05 CATCHBASIN - INLET AND OUTLET PIPES

    A. Extend inlet and outlet pipes through the walls of catchbasins, for a sufficient distance beyond the outside surface to allow for connections, cut off flush with the wall on the inside surface, unless otherwise directed.

    B. The concrete or brick and mortar shall be so constructed around the pipes as to prevent leakage and form a neat connection.

   3.06 CASTINGS AND FITTINGS

    A. Handle in a manner that will prevent damage. Reject all damaged castings and fittings.

    B. Place all castings and fittings in the positions indicated on the Plans and set true to line and grade.

    C. If castings are to be set in concrete or cement mortar, place all anchors or bolts and position before the concrete or mortar. The castings shall not be disturbed until the mortar or concrete has set.

    D. When castings are to be placed upon previously constructed masonry, the bearing surface of masonry shall be brought true to line and grade and present an even bearing surface in order that the entire face or block of the casting will come in contact with the masonry as indicated on the plans.

    E. All castings shall be set firm and snug and shall not rattle.

    END OF SECTION

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