SECTION 161-19 CONSTRUCTION STANDARDS.
A. Work performed by the Department of Public Works. In the event that the Department of Public Works, Water and Sewer Division, is involved either in the installation of a new service or relay to a single-family residence, or repairs to an existing service, the work shall be performed in accordance with the following rules and regulations:
(1) Trenches or areas of excavation, after completion of the installation or repairs, shall be rough graded and hand raked. Permanent repairs on the landowner's property (i.e., looming, seeding, cold patching and hot topping of drives and walks, cement sidewalks, steps, etc.) shall be his or her responsibility.
(2) Fences or walls of any kind, if not removed by the landowner, will, if within the Department's means and capabilities, be removed and stacked on the landowner's property. Upon completion of the Department's work, re-erection or rebuilding shall be the responsibility of the landowner.
(3) Trees, bushes, shrubs, hedges, flowers, lawn ornaments, etc., if not removed by the landowner, will, if within the department's means and capabilities, be removed and stacked on the landowner's property. Upon completion of the department's work, replanting or replacement of these items shall be the responsibility of the landowner.
(4) In the event that the department's work necessitates the cutting of roots of trees, bushes, shrubs, hedges, etc., the city will not be responsible for their continued life.
(5) The landowner shall be responsible for notifying the department of any underground wiring, wells, septic system pipes, drainage pipes, etc., that may be in the line of construction. Unless the department is notified in advance, the city will assume no liability for resulting damages.
B. Work performed by developers and/or private contractors. In case of a sewer extension on or to a new development and on or to any private development, the owner of the property or the developer thereof shall construct and install the water mains and house connections in accordance with the following rules and regulations:
(1) There shall be submitted to the Commissioner of Public Works, in the case of a new development which has the approval of the Planning Board, a plotted plan which has been recorded in the Middlesex South District Registry of Deeds. Other private projects approved by appropriate city agencies shall also submit a plan of a proposed sewer system.
2) Any and all plans for a sewer system in the City of Marlborough will show and/or specify the following: All gravity mains will be a minimum of eight (8) inches in diameter; all laterals, interceptors, trunklines, etc., will be either asbestos cement, cast iron, reinforced concrete or polyvinyl chloride (PVC). The class of pipe will accommodate the field conditions, i.e., all asbestos cement sewer pipe up to twelve-foot bury can be Class 2400; twelve (12) to eighteen (18) feet will be Class 3300; eighteen (18) to twenty-four (24) feet will be Class 4000; and anything over twenty-four (24) feet will be Class 5000. No Class III concrete pipe shall be used for sewer construction. Class IV will be used up to a twenty-foot
bury, and anything over twenty (20) feet will be Class V, PVC pipe shall meet or exceed the ASTM D-3034, SDR 35 requirements. PVC pipe shall not be used for pipes with diameters greater than fifteen (15) inches unless expressly approved in writing by the Commissioner of Public Works. When the cover is five (5) feet or less under a roadway, the class and type of pipe will be specified by the Department of Public Works. The stationing and slopes of all pipes will be shown on a plan and profile view with an appropriate scale. The distance between any two (2) manholes shall never exceed three hundred (300) feet. Any two (2) sewer lines entering a manhole or a structure with a difference in elevation greater than three (3) feet zero (0) inches, the pipe with the higher elevation will enter via an outside drop connection and will be shown as a drop manhole on the plans. All sizes of all pipe will have as their minimum slope that slope which yields the
scouring velocity for the particular diameter pipe. A bench mark shall be provided every five hundred (500) feet. Any and all existing utilities within thirty (30) feet of the proposed main will be shown and, if available, their elevations noted.
(3) Any contractor involved in sewer construction in the City of Marlborough will strictly adhere to the provisions as set forth in S.161-5. No equipment, tools or material will be rented or loaned from the Department of Public Works. All materials used must be of the same make and quality as set forth hereinafter.
(4) Costs. All labor and material costs to install a sewer system a specified herein will be borne by the owner, developer or contractor, whatever the case may be. Costs for taps into the public system and the restoration thereof of any public way will be borne by the owner, developer or contractor.
(5) Inspection will be provided by the City of Marlborough only on a limited or part-time basis. Before any backfilling is done, the Department of Public Works Water Division will be notified twenty-four (24) hours in advance, and a man will inspect the completed work. If the Department of Public Works feels that insufficient workmanship and care is being taken in the installation, a man will be assigned from the Department of Public Works on a full-time basis. The contractor or owner will bear the cost of this man at his hourly wage rate, Monday through Friday, from 7:30 a.m. to 4:30 p.m., or in the case of summer hours, 7:00 a.m. to 3:30 p.m. Any time spent on the site not within these limits or Saturday,
Sunday, holidays, etc., will be at twice the man's rate.
(6) Excavation in any public way will require a road opening permit from the Department of Public Works. Necessary forms may be obtained and filed with the Department of Public Works Street Division. It will be the contractor's responsibility to notify utility companies, such as gas, telephone, electric, etc., if there is any possibility of their equipment or their property being jeopardized by excavation. It shall also be the contractor's responsibility to notify the Fire Department and Police Department of said work to be performed and, if necessary, to hire uniformed police for traffic control. In the event that the roadway cannot be restored to its normal surface immediately following the work,
sufficient care will be taken to make the roadway smooth for traffic and, if necessary, to light with flashers as a warning to motor vehicles.
(7) Before any sewer mains, water mains or drain lines are installed in a new subdivision or development, the contractor will bring the entire site where these utilities are located to subgrade, such grade will be verified by grade stakes provided and set by a registered land surveyor or engineer employed by the owner or contractor, so that the Engineering Division of the Department of Public Works may expedite their checking of such grades.
(8) All materials used shall be specified in Section 161-19(B), Work performed by developers and/or private contractors. All sewer mains and sewer services will be set in a screened gravel ben, three-fourths to one-inch stone. The stone bed will always be on firm undisturbed earth. In the event of peat or wet clay at grade, the contractor will excavate enough material so that when backfilled with stone, it will provide a sound bed.
The determination of how much unsuitable material is to be excavated will be at the immediate discretion of the Inspector of the Department of Public works. All concrete pipe shall be jointed by the use of a flat rubber gasket or the O-ring type. All cast iron for sewer shall be the same class for gravity and force main systems; all force main systems will be cast iron. Under normal conditions, all pipe will have a six-inch envelope of screened gravel aground it. In ledge this envelope will go to eight (8) inches. Select material will immediately follow the stone over the pipe and as to the amount will depend upon the depth and whatever the Inspector deems necessary, at which time
normal backfilling may start using already excavated material.
(9) Manholes may be poured in place, pre-cast or, at the discretion of the Department of Public Works, be barrel block and plastered both sides. All manholes will have aluminum steps on a one (1) foot zero (0) inch spacing. All pre-cast sections will be made watertight by O-ring joints or an approved mastic. Connections to manholes may be Mortar Joint, Lock Joint Flexible Manhole Sleeve, Press Wedge II, Kor N Seal and Res Seal. The exterior of all manholes shall be completely covered with a bituminous waterproofing.
(10) Manhole rings/covers shall be of the same type as used by the Department of Public Works.
(11) Brick inverts. All sewer manholes will have a brick table constructed in their base to meet all incoming and outgoing pipes to that the flow is channeled smoothly from one point to another. All brick used for manholes inverts will be a hard burned sewer brick to meet ASTH C32-69 Grade SS. Brickwork will also be used between the manhole structure and ring and ring cover to give the desired grade. However, the brickwork in this area will never exceed eight (8) inches. This brickwork can be with a common brick.
(12) Thrust blocks will be used on any force main sections where called for by the Department of Public Works.
(13) Chimneys will be employed on the main wherever a service is needed when the depth of the main exceeds eight (8) feet zero (0) inches. This will meet exception when the elevation of the connection at the building does not allow the use of a chimney. All chimneys will be encased in a concrete envelope six (6) inches thick.
(14) Y-Branches and/or trees will be employed in the main for depths of eight (8) feet zero (0) inches or less. All Y-branches, trees, chimneys, etc., will be provided with proper end caps until the time that the completed tie-in is made.
(15) Tap to main. Main to main connections will only be made by the use of a manhole as specified in Section 19 B(9), (10), & (11) or, in the case of a service, by use of a tapping saddle approved by the Department of Public Works.
(16) Building Sewers.
(a) All building sewers will be either asbestos cement, cast iron or polyvinyl chloride (PVC) having a minimum diameter of five (5) inches and shall conform to the following specifications: Asbestos cement pipe ASTM C 428-67, cast iron pipe ASTM A74-66 and PVC ASTM D-3034, SDR 35. Joints shall be tight and waterproof. Cast iron shall be used when passing under or through any wall or footing of a building. If installed in filled or unstable ground, the building sewer shall be laid on a suitable concrete be or cradle or shall be cast iron or as approved by the Department of Public Works.
(b) The size and slope of the building sewer shall be subject to the approval of the Commissioner, but in no event shall the diameter be less than five(5) inches. The slope of such pipe shall not be less than one-fourth (1/4) inch per foot. The building sewer shall be laid at uniform grade and in straight alignment insofar as possible. Changes in direction shall be made only with benched manholes or curved pipe and fitting, as approved by the Commissioner. A clean-out shall be located on the exterior side of the building service and shall be in a place that is accessible for maintenance by the Department of Public Works or others.
(c) All parts of new building drains and sewers shall withstand, under test without observable leakage, a ten-foot head or water for a minimum period of fifteen (15) minutes at a temperature above the freezing point of water.
(d) The connection of the building sewer into the public sewer shall be made at the Y or T-branch or at bench level in a manhole if such branch tee or manhole is accessible.
(e) If no branch, tee or manhole is available, a connection may be made by tapping the existing sewer by an approved method.
(f) No person shall make connection of roof drains, downspouts, foundation drains, areaway drains, basement drains, sump pumps or other sources of surface runoff or groundwater to a building sewer or building drain which in turn is connected directly or indirectly to a public sanitary sewer.
(17) Leakage tests for gravity sewers.
(a) The pipeline shall be made as nearly watertight as practicable, and leakage tests and measurements shall be made on sections of approved length.
(b) The contractor shall furnish suitable test plugs, water pumps, and appurtenances and all labor required to properly conduct the leakage tests on the pipeline.
(c) Upon completion of a section of the sewer, the contractor shall dewater it and conduct a satisfactory test to measure the infiltration for at least twenty-four (24) hours. The amount of infiltration, including manholes, Y-branches and connections, shall not exceed three hundred (300) gallons per inch of diameter per mile of sewer per twenty-four (24) hours. The contractor shall be responsible for the satisfactory water-tightness of the entire section of sewer and shall satisfactorily repair all joints or other locations that are not sufficiently watertight.
(d) For making the infiltration tests, underdrains, if used, shall be plugged, and other groundwater drainage shall be stopped to permit the groundwater to return to its normal level insofar as practicable.
(e) Where practicable, the leakage test shall be made at a time when the groundwater is at least one (1) foot above the top of the pipe of the highest section of work being tested.
(f) Suitable bulkheads shall be installed, as required, to permit the test of the sewer.
(g) Where the groundwater level is less than one (1) foot above the top of the pipe at its upper end, the sewers shall be subjected to an internal pressure by plugging the pipe at the lower end and then filling the pipelines and manholes with clean water to a height of two (2) feet above the top of the sewer at its upper end. Where conditions between manholes may result in test pressures which would cause leakage at the stoppers in branches, provisions shall be made by suitable ties, braces and wedges to secure the stoppers against leakage resulting from the test pressure.
(h) The rate of leakage from the sewers shall be determined by measuring the amount of water required to maintain the level two (2) feet above the top of the pipe.
(i) Leakage from the sewers under test shall not exceed the requirements for leakage into sewers as hereinbefore specified.
(j) The sewers shall be tested before any connections are made to buildings.
(k) The contractor shall construct weirs or other means of measurement as may be required, shall furnish water and shall do all necessary pumping to enable the tests to be properly made.
(l) Should the sections under test fail to meet the requirements, the contractor shall do all work of locating and repairing leaks and retesting as the Engineer may require without additional compensation.
(m) If in the judgment of the Inspector or the Department of Public Works, it is impracticable to follow the foregoing procedure exactly for any reason, modifications in the procedure shall be made as required and approved, but in any event, the contractor shall be responsible for the ultimate tightness of the line within the above test requirements.
(18) The contract shall furnish to the City of Marlborough, Department of Public Works, upon completion of the job, a set of as-built plans which will indicate the following: invert elevations of all pipes at any structure or manhole; rim elevations of all structures or manholes; the correct slope on all pipe between structures or manholes in feet per foot; the exact location of chimneys and Y-branches on the main and, in the case of chimneys, the vertical height over the top of the pipe; the exact location of when the building sewer enters onto private property form any city street or easement. This location will be pinned down by at least two (2) ties form permanent or fixed
object. This same method will be used for locating cleanouts, when the service connection is made to the building.
(19) Warning ribbons. If nonmetallic pipes are used in the installation of any sewer main or service pipe, a warning ribbon shall be used. Said ribbon shall be green in color and imprinted with the words "caution sewer line below" or words of similar intent and shall be metallic to provide for future locating with inductive tape locators. Depth of burial shall be in accordance with the manufacturer's standards, except that burial shall not be at a depth less than eighteen (18) inches nor at a depth greater than forty-eight (48) inches.
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