STANDARD SPECIFICATIONS FOR PRIVATE BUILDING SEWER LINES IN PUBLIC RIGHT-OF-WAY

Transcription

1 STANDARD SPECIFICATIONS FOR PRIVATE BUILDING SEWER LINES IN PUBLIC RIGHT-OF-WAY Approved and adopted as Official Document Number this 10th day of December, 1980 Donald R. Boyd, P.E., Director Water & Pollution Control Depts. of Kansas City, Missouri Myron D. Calkins, P.E. Director Public Works Department of Kansas City, Missouri

2 STANDARD SPECIFICATIONS FOR PRIVATE BUILDING SEWERS IN PUBLIC RIGHT-OF-WAY 1. GENERAL a. Description: These specifications shall apply to that part of a private building sewer line which lies in public right-of-way or easement. Building sewer is defined as that part of the horizontal sewer line which begins and extends from the end of the building drain and receives the sewage discharge of the building drain and conveys it to a public sewer, private sewer, individual sewage disposal system or other point of disposal. b. Preference: In case these specifications conflict with city job specifications for a particular project, the job specifications shall govern. In case these specifications conflict with any standard specifications, these specifications shall govern in all instances where private lines in public right-of-way are concerned. c. Standards: Where reference is made to standard specifications and the date of adoption is not shown, the current standard will apply. 2. STANDARD SPECIFICATIONS INCLUDED IN THESE STANDARD SPECIFICATIONS: Private sewer lines in public right-of-way shall conform to these standard specifications and to the following standard specifications, unless modified by the city job specifications. a. General Provisions and Covenants, Division I, Official Document No b. Standard Specifications for Sanitary Sewers, Division II, Official Document No c. Street Specifications and Standards, Official Document No PL-l

3 3. PIPE a. Approved pipe materials shall be vitrified clay, cast iron, polyvinyl chloride, and acrylonitrile butadiene styrene. b. Concrete pipe may be used to convey storm water but shall not be used to convey sanitary sewage. Pipe materials other than these will not be used unless specified in the job specifications and approved by the City. c. (1) Clay pipe shall conform in every respect with the specifications for clay sewer pipe ASTM designation C200 (extra strength). 4. JOINTS (2) Cast iron pipe shall conform in every respect to Federal Specifications WW-P-421. (3) Polyvinyl chloride pipe shall conform in every respect to A.S.T.M. D- 3034, and SDR-35, except as otherwise specified herein. (4) Acrylonitrile butadiene styrene pipe shall conform in every respect to ASTMD 2661 except as otherwise specified herein. (5) Concrete pipe shall conform in every respect with the specifications for concrete sewer pipe ASTM designation C14. a. All vitrified clay pipe shall have factory-molded and applied polyurethane couplings complying with ASTM Designation C-425, or shall be plain end pipe with polyvinyl chloride couplings conforming to ASTM Designation D All couplings shall form tight compression joints. If a repair is encountered in which no more than two (2) joints are required, the Contractor may use plain end pipe with no plastic coupling. If plain end pipe with no plastic couplings is used, the Contractor shall seal all joints, with jute, in accordance with good construction practices; then, the joints shall be encased with a six (6) inch thick concrete collar as shown on Drawing PL-l. b. Cast iron pipe may have bell-and-spigot or mechanical joints. If bell-and-spigot joints are used, they shall be joined with caulked lead or rubber compression joints conforming to USASI As1.11. If mechanical joints are used, manufacturer s recommendations for installation and good construction practices shall be adhered to. c All Polyvinyl chloride shall be of bell-and-spigot PL-2-

4 c. CONT D type and have a manufacturer s recommended compression rubber gasket joint conforming to ASTM C-443. If less than two joints of pipe are to be used in a repair, the Contractor may use plain end pipe. If plain end pipe is used, all joints without rubber gaskets shall be connected with a flexible repair coupling and be encased with a six (6) inch thick concrete collar (See Dwg. No. PL-1) d. All acrylonitrile butadiene styrene pipe shall be of fitting socket-open end and are to be solvent welded by a solvent known as M.E.K. (methyl-ethylketone) or by a manufacturer s recommended solvent equal to MEK and conforming to ASTM D If less than two joints of pipe are to be used in a repair, the Contractor may use plain end pipe if adequate adapters are solvent welded to it and the existing sewer pipe. The contractor will allow the joint to set for a sufficient length of time before backfilling or disturbing the joint. e. All concrete pipe shall be of bell-and-spigot type and have a manufacturer s recommended compression rubber gasket joint conforming to ASTM C-443. If less than two joints of pipe.are to be used in a repair, the Contractor may use plain end pipe. If plain end pipe is used, all joints without rubber gaskets shall be encased with a six (6) inch thick concrete collar. (See Dwg. No. PL-l). 5. FITTINGS: a. Materials: (1) All fittings used including bends, adapters, tees, wyes, couplers, hubs and transition sections shall conform to the requirements of Sections 3 and 4 of these specifications. (2) All fittings shall be factory-produced and shall be designed for installation on the pipe to be used. Fittings shall be of the same quality and material as the pipe used. (3) When the sewer that is to be tapped is a clay sewer, a clay saddle, a plastic strap on saddle or a Fowler saddle may be used. When the tapped sewer is a plastic sewer, a plastic (PVC) saddle with a neoprene gasket under the saddle or a Fowler saddle shall be used. When the tapped sewer is cast iron pipe, a plastic (PVC) strap on saddle or a Fowler saddle shall be used. When the tapped sewer is an acrylonitrile butadiene styrene pipe, a plastic (PVC) saddle, PL-3

5 5. a.3. CONT D an acrybritrile butadine styrene saddle or a Fowler saddle shall be used. For PVC and ABS sewers, the inert filler shall be coated with epoxy. b. Construction Details 6. PERMITS (1) The maximum deflection permissible at any one fitting shall be forty five (45) degrees (one eighth (1/8) bend). (2) Private sewers shall be connected to a tee, Wye or a manhole on the public sewer where such is available. Where no tee, wye, or manhole are available, the sewers shall be tapped. Paragraph (3) of Section S (a), Materials, lists what type of saddles are permissible depending on the material of the sewer to be tapped. a. The contractor shall obtain all necessary permits and licenses whether issued by City, County, or State. 7. EXCAVATIONS a. General: (1) Excavation for private sewer lines shall be as specified in Standard Specifications for Sanitary Sewers except as amended herein. b. Width of Trench: (1) The width of trench at the top of a pipe shall not exceed the outside diameter of the pipe plus eighteen (18) inches. Where rock is encountered, requiring removal by blasting, this width may be increased by ten (10) inches. c. Tunneling: (1) Tunneling will be permitted only under existing utilities or upon permission from the Engineer. (2) If tunneling is permitted, the Contractor shall submit to the Engineer for approval the method of tunneling, type of bracing and precautions to be used to insure against a collapse. d. Shoring, Sheeting and Bracing (1) The contractor shall do all necessary trench PL-4-

6 7. d. (1) CONT D bracing, shoring, or sheeting that will provide assurance against slides or cave-ins. Additional shoring, sheeting, and bracing shall be placed wherever so required for, the successful and safe prosecution of the work as determined by the Engineer. B. PIPE BEDDING a. General The sewer trench in earth excavation shall be carried to a point not less than four (4) inches below bottom of the pipe barrel and in rock excavation to a point not less than six (6) inches below bottom of pipe barrel. b. Bedding Aggregate All materials used for crushed stone pipe bedding shall conform to the requirements of MCIB Bulletin #2 for coarse aggregate and shall meet the graduation specified therein under Column III, Table 2, for three-quarter (3/4) inch maximum size aggregate with the following modifications. c. Installation Sieve Size Percentage Passing No No The three-fourths (3/4) inch crushed stone pipe bedding shall be compacted to bottom of pipe with proper allowance for bell joints. After each joint of pipe has been shoved home and placed in proper alignment, crushed stone shall be placed and compacted to a minimum of six (6) inches above the pipe bell. In no case shall brick or other large stones be used as bedding, if such stones are necessary to expedite installation, they shall be removed before backfilling and replaced with crushed stone. (See Drawing No. PL-l) No more than six (6) inches of crushed stone shall be used for pipe bedding. If excavation is carried deeper than six (6) inches below bottom of pipe, the overexcavated area shall be filled with earth compacted the full width of trench. This compacted earth shall be continued until no more than six (6) inches, nor less than four (4) inches of three-fourths (3/4) inch crushed stone bedding, will be required to bring pipe to proper grade. PL-5-

7 9. LINE AND GRADE a. Minimum Grade 10. COVER The minimum grade allowable for private sewers in public right-of-way will be one-fourth (1/4) inch per linear foot. A grade as little as one-eighth (1/8) inch per linear foot may be allowed in special cases upon written permission from the Engineer. In no case will a private sewer in public right-of-way be constructed having a grade less than one-eighth (1/8) inch per linear foot. a. Minimum Allowable Cover 11. BACKFILL (1) A minimum cover of four (4) feet from top of pipe to finish grade of ground surface is required for all private lines in public right-of-way. If less cover is necessary to allow entrance into a public sewer or avoid excessive rock excavation, the private sewer line shall have a concrete encasement no less than six (6) inches thick with a minimum cover over the encasement of one (1) foot. (See Drawing No. PL-3). a. General: (1) Backfill of excavations for private sewer lines in public right-of-way shall be as specified in Sanitary Sewer Specifications as amended herein. b. Backfill in Open Excavation: (1) The backfill material shall be compacted to a minimum of 90.0 percent of optimum density as determined by the Standard Proctor Test (ASTM D- 698) or shall be compacted to a density equivalent to the density of the immediate adjoining soil. The top six (6) inches of backfill in street rightof-way shall be compacted to a minimum density of 95.0 percent of optimum density as determined by the Standard Proctor Test. Backfill material shall be placed and compacted only when its moisture content is within ± 2.0 percent of optimum moisture content as determined by Standard Proctor Test. (2) Acceptable backfill materials shall be earth or rock. Rock used in backfill shall have the following gradation: PL-6-

8 11. b. 2. CONT D Screen Size 1-1/2 1 1/2 1/4 % Passing (3) The area between the top of crushed stone bedding and a horizontal plane one (1) foot above the top of the sewer pipe shall be backfilled with earth or stone. Such material shall be carefully tamped around the pipe with hand or mechanical tampers. (4) The backfill above a horizontal plane one (1) foot above the top of pipe may be filled with earth or stone, except in street right-of-way where backfill material must be in stone. All backfill must be completed with mechanical tampers or other equipment to a density at least equal to the density of adjacent undisturbed soil. (5) No rocks, boulders, concrete rubble, or other stones with any dimension greater than twelve (12) inches shall be used in the backfill. If stones smaller than twelve (12) inches, but larger than two (2) inches are used, they shall not be placed closer than two (2) feet from the top of pipe and care shall be taken to insure that proper compaction is obtained around such stones. c. Backfill in Tunnel d. Boring (1) Backfill in.a tunnel shall consist of cement grout mixed to a ratio of twelve (12) parts sand to one (1) part cement. (2) Grout shall be placed in a manner that will completely fill all voids between the tunnel and outside diameter of the pipe. Adequate provisions shall be made to prevent the grout mixture from slumping or running out the ends of the tunnel. (1) Backfill in bored tunnels shall be with cement grout mixed to a ratio of four (4) parts sand to one (1) part cement. The grout shall be placed in such a manner that will completely fill all voids between the bored tunnel and the outside diameter of the pipe. PL-7-

9 12. TAPPING CITY SEWERS a. General 13. INSPECTION a. General 14. SEWER SIZE a. General 15. SITE RESTORATION (1) All applicable tapping policies and procedures are made part of these specifications by reference and are subject to change by the City without notification. Copies of current policies and procedures as well as fee schedules used in charging for City-made taps can be obtained from the Pollution Control Department. (1) All applicable inspection policies, procedures, and charges are made part of these specifications by reference and are subject to change- by the City without notification. Copies of current policies, procedures, and fee schedules may be obtained from the Pollution Control Department. No private sewer line shall be constructed in public right-of-way with an inside diameter of less than four (4) inches. a. General All pavement, surfacings, driveways, sidewalks, curb, wall, buildings, utility poles, guy wires, and other surface structures affected by work in public right-of-way, together with all sod and shrubs, shall be maintained and, if removed or otherwise damaged, shall be restored to their original condition, and in accordance with all applicable permits and regulations. 16. EXISTING UTILITIES a. General (l) The Contractor is responsible for protecting all utilities in public right-of-way. All permits and licenses required in the prosecution of any and all parts of work shall be obtained by the Contractor. (2) The Contractor shall notify all utilities at PL-8-

10 16. a. (2) CONT D least 48 hours in advance before making excavation in accordance with Missouri State Law; Senate Bill No. 583, 78th General Assembly of the State of Missouri. (3) When water mains or water service lines exist in the area, the Contractor shall comply with all applicable rules and regulations of the Kansas City, Missouri Water Department and the Missouri State Board of Health. PL-9-

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