The vendor is required to provide to clean sediment and debris from municipal drainage system structures and pipes, to perform closed caption television (CCTV) pipe inspections, and to conduct inspections of drainage structures required by the town’s municipal separate storm sewer system (MS4) permit.
- Clean drainage structure includes the use of vacuum equipment to remove all accumulated sediment such as dirt, sand, gravel, roots, grease, and other debris from existing catch basin, drywell and manhole structures, including the recording of removed material volumes and proper disposal in accordance with all local, state and federal regulations.
- This item includes all equipment, tools, materials and labor required to complete the work.
- The structure cleanings are required annually by the town’s municipal separate storm sewer system (MS4) permit issued by the department of energy and environmental protection
- For drainage structure cleaning, contractor shall maintain detailed records identifying the total number of structures cleaned per year, streets where those structures are located and associated volume of removed materials.
- For drainage pipe cleaning, contractor shall maintain detailed records identifying the total length of pipes cleaned per year, pipe segments identified by map id numbers (to be provided by the town) and streets where that worked occurred, and associated volume of removed materials.
- All cleaned drainage structures and pipes must be free of sediment as verified by visual inspection or push camera review when requested by the town.
- The contractor shall make every effort to remove all sludge, dirt, sand, gravel, roots, grease, and other debris from the existing drainage systems.
- Incomplete or deficient work shall be finished or corrected by the contractor at no additional cost to the town.
- Contractor shall retain documentation regarding proper material disposal, which shall be provided to the town upon request.
- Structure frames and covers removed for cleaning operations shall be reinstalled flush with the structure top or frame.
- Precautions shall be taken at all times to protect drainage systems from damage and the discharge of any sediment into downstream areas, which may include the installation of temporary pipe plugs and erosion controls if deemed necessary by the town.
- Contractor staff shall be experienced and skilled in the use of the equipment utilized to complete the work.
- The engineer reserves the right to prohibit use of any equipment or method deemed inappropriate for the task.
- The flushing of sludge, dirt, sand, gravel, roots, grease, and other debris downstream will not be permitted.
- Any material flushed into downstream drainage systems, pipe outlets, wetlands, watercourses and other waterbodies shall be immediately removed to the satisfaction of the town at the contractor’s expense.
1. Measurement and payment
• Clean drainage structure will be measured and paid at the contract unit price for each structure cleaned and accepted, including proper material disposal and all materials, equipment, tools and labor incidental thereto
• Payment applications will not be processed until records identifying the streets where structures were cleaned and associated volume of removed materials has been submitted and approved by the town
• Clean drainage pipe of the size specified will be measured and paid at the contract unit price for each hour spent working in town cleaning sediment from pipes, including proper material disposal and all materials, equipment, tools and labor incidental thereto.
• This work will be assigned on an as-needed basis and will only be paid for when the town has provided prior authorization
• Payment applications will not be processed until records identifying the pipes that were cleaned and the volume of removed materials has been submitted and approved by the town.
- The following items will not be measured separately for payment, but shall be considered as included in the unit price bid for “clean drainage structure” and “clean drainage pipe” of the size specified:
• Removing and replacing grates and cover as required to access structures and pipes for cleaning
• Maintenance and protection of traffic at each site during cleaning operations
• Coordination with the mdc and all costs associated with using water with a portable meter on fire hydrant connections when filling water trucks
• Use of temporary pipe plugs and erosion controls to manage sediment during cleaning operations
• Use of a push camera to verify pipe cleaning is complete
• Removal of excess sediment from the ground surface and downstream areas caused by the contractor’s operations
• Time for crews and equipment travel to and from town
2. Inspect drainage system
• “Inspect drainage structure” includes the visual inspection of existing catch basin, drywell and manhole structure conditions after cleaning to identify any structural deficiencies, which includes filling out the enclosed inspection forms.
• These inspections shall be conducted from the ground surface, only apply to structures in specific areas identified by the town and includes submission of inspection forms to the town on a monthly basis and all equipment, tools, materials and labor required to complete the work.
- Closed circuit television camera:
• the camera used for pipe inspections shall be designed and constructed for inspections with an accurate footage counter.
• Lighting for the camera shall be suitable to allow a clear picture of the entire periphery of the pipe
• The rotating camera and light head configuration shall provide a minimum of 240° pan and tilt angle measuring centerline to centerline and a 70° lens viewing angle.
• The camera shall record in color and provide a minimum of 1280h x 720w pixels for a total of 921,600 pixels at 30 frames per second resolution. geometrical distortion of the image shall not exceed one percent (1%).
• The camera shall be equipped with the necessary circuitry to allow for the remote adjustment of the optical focus and iris from the power control unit at the viewing station
• The camera and associated equipment shall be designed to withstand the harsh conditions encountered in sewer and pipeline environments, including moisture, humidity, and potential contact with debris
- Video capture system:
• The video and audio recordings of the pipe inspections shall be made using digital video equipment.
• A video enhancer may be used in conjunction with, but not in lieu of, the required equipment.
• The digital recording equipment shall capture sewer inspection on hard drive with each sewer reach inspection recorded as an individual movie file and images of defects in picture format (.jpeg).
• The video file name shall contain both the upstream and downstream manhole number and date of inspection, and also be listed in inspection reports generated in .pdf format.
• The system shall use the most current pipeline assessment certification program (PACP) compliant application software and shall be fully object oriented
• It shall be capable of printing pipeline inspection reports with captured images of defects or other related significant visual information on a standard color printer.
• The imaging capture system shall store digitized color picture images and be saved in digital format on a hard drive or approved equal.
• The system shall be able to produce data reports to include, at a minimum, all observation points, and pertinent data with defect severity codes in accordance with PACP naming conventions.
• Camera footage, date and structure numbers (to be provided by the town) shall be maintained in real time and shall be displayed on the video monitor as well as the video character generators illuminated footage display at the control console.
• The audio portion shall be sufficiently free of background and electrical noise so as to produce an oral report that is clear and discernible.
- Reporting capabilities
1. General
• Company and operator name
• Date and time
• Weather conditions
• Street name
• Inspection limits (i.e., structure # to structure # - these numbers will be provided by the town)
• Direction of inspection (upstream or downstream)
• Pipe size and material
• Continuous pipe length counter for each pipe (starting at zero)
• Total pipe length
• Additional information and comments
2. Observations
• Location along pipe (within one foot) and clock position of defects and pipe connections
• Type and severity of defects
• Operator remarks (as appropriate or needed)
- The operator shall also record audio of the type of defect or feature, clock position around pipe circumference, location based on linear footage and other pertinent data.
- Audio descriptions should be made at:
• Points of pipe failure or weakness
• Points of significant infiltration
• Pipe connections
• Where unusual conditions are noted
• Where digital still photos are taken.
- Contract Period/Term: 2 years