00490_Addendum No 3_sealed.pdf

Raleigh Water 33 01 30.11-1 Sewer Line Cleaning and TV Inspection

Updated: April 2020

SECTION 33 01 30.11

SEWER LINE CLEANING AND TV INSPECTION

PART 1 GENERAL

1.01 GENERAL REQUIREMENTS

A. Provide labor, materials, and equipment required to clean the sewer lines designated on the drawings, including manhole walls, of dirt, grease, sand, sludge, roots and other solid or semi-solid materials prior to trenchless rehabilitation. Equipment shall be subject to approval of the Engineer.

1.02 SCOPE OF WORK

A. Clean the lines and perform a TV inspection. Based on the TV inspection, deliver to the Owner and Engineer, in report form, the location and extent of the defects for each pipeline. The report will give location and description of obstructions and will also include service lateral locations. The report will be completed and submitted along with an IT Pipes database. After an appropriate period of time for review, the Engineer will call for a meeting to discuss the report and make determinations on the final scope of work.

1.03 RELATED SECTIONS

A. The following Sections have work that is directly related to this Section. This does not relieve the Contractor of his responsibility of proper coordination of all the work:

1. Section 01 35 13 Specific Project Requirements

2. Section 01 50 00 Temporary Facilities and Controls

1.04 REFERENCES

A. National Association of Sewer Service Companies (NASSCO) Pipeline Assessment and Certification Program (PACP).

B. National Association of Sewer Service Companies (NASSCO) Manhole Assessment and Certification Program (MACP).

C. National Association of Sewer Service Companies (NASSCO) Lateral Assessment and Certification Program (LACP).

PART 2 PRODUCTS

2.01 HYDRAULIC CLEANING METHOD

A. Method shall employ the use of a moveable type dam constructed in such a way that the dam may be collapsed at any time during the cleaning. Equipment which cannot be collapsed instantly will not be allowed. Other equipment, equally effective, that will permit passage of sewage when in use may be approved. Moveable dam shall be of equal diameter to the pipe being cleaned and shall provide a flexible scraper around the periphery to insure removal of grease.

2.02 HIGH VELOCITY JET CLEANING METHOD

A. Method shall employ high pressure water streams containing cleaning and sanitizing chemicals ejected through hose nozzles and pressure gun. Truck mounted mobile

Raleigh Water 33 01 30.11-2 Sewer Line Cleaning

Updated: April 2020 equipment shall carry a 1000-gallon water tank capable of holding corrosive or caustic cleaning or sanitizing chemicals, auxiliary engines, pumps and hydraulically driven hose reel. Refill pipe to the tank shall have a minimum 4-inch air gap to prevent backflow and contamination of the Owner water system.

B. There shall be included a minimum of 500 feet of high pressure hose with a selection of two or more high velocity nozzles. Contractor shall determine flow and pressure required to scour and flush debris from sewer without damaging pipe. The nozzle shall be capable of producing a scouring action from 15 degrees to 45 degrees in all size lines designated to be cleaned.

C. There shall be included a high velocity gun for washing and scouring manhole walls and floor. The gun capacity shall equal 25 gpm at 500 to 800 psi. The gun shall be capable of producing flows from a fine spray to a long distance solid stream and shall be operated from the high pressure hose.

2.03 MECHANICAL CLEANING METHOD

A. Bucket machines shall be in pairs with each machine powered with a minimum of a 25 HP engine to insure sufficient pulling power. Each machine shall be equipped with a two-speed transmission and shall be capable of pulling at rates of 150 feet per minute in high speed and 100 feet per minute in low speed. Machine shall have an overload device that will prevent damage to the sewer.

B. Power rodding shall be capable of holding a minimum of 800 feet of rod. The rod shall be of specially treated steel. The machine shall have a positive rod drive and produce a 1000-pound rod pull. To insure safe operation, the machine shall have a fully enclosed body and an automatic safety throw out clutch.

PART 3 EXECUTION

3.01 CLEANING OPERATIONS - GENERAL

A. Take precautions to protect the sewer lines from damage by the improper use of cleaning equipment.

B. Properly dispose of material removed from the sewer.

C. When hydraulically propelled cleaning tools, which depend upon water pressure to provide cleaning force, or any in the sewer line are used, take precautions to ensure that tools which retard the flow of water or that use water pressure for cleaning will not cause damage or flooding to public or private property.

D. Owner’s water system may be used in accordance with Section 01 50 00, Temporary Facilities and Controls.

E. If the Contractor desires to utilize water from the Owner's potable water system, he must first gain authorization prior to use and comply with Owner requirements. The Owner will furnish water for cleaning purposes to the Contractor free of charge, but should it appear to the Engineer or Owner that the Contractor is abusing his privilege to use Owner water free of charge, then the Owner has the option at any time to refuse the Contractor use of the Owner's water supply at no additional cost to the Owner.

F. When fire hydrants are used, hydrants in use shall have fully opened hydrant valves at all times. Hydrants shall be immediately released to fire fighters in an emergency.

Raleigh Water 33 01 30.11-3 Sewer Line Cleaning

Updated: April 2020

Refill pipe to the tank shall have a minimum 4-inch air gap to prevent backflow and contamination of the Owner water system.

G. Collection of Refuse:

1. Remove solid or semi-solid material resulting from the cleaning operations at the downstream manhole of the section being cleaned. Passing material from manhole section to manhole section shall not be permitted.

2. If material is allowed to migrate to a lower manhole reach that is not scheduled for cleaning or rehabilitation, the lower manhole reach shall be cleaned and CCTV inspected in accordance with these specifications at no additional cost.

H. Heavy Cleaning:

1. When heavy cleaning is required, CCTV shall be used with the cleaning operation.

2. Contractor shall verify all material and debris has been removed from the main.

3. If cleaning reveals sags or other defects, CCTV shall inspect the defects while the cleaning jetter provides temporary full view of sections prone to holding water.

3.02 HYDRAULIC CLEANING:

A. Construct a suitable temporary weir or dam in the downstream manhole so that both liquid and solids are trapped. Pump trapped material, both solid and liquid, from the manhole into an above ground mobile retention chamber. Chamber shall be enclosed and contain not less than two baffles to allow settlement of the solids. Chamber may be equipped with a piping system to permit relatively clean liquid to return to the sewer.

3.03 CLEANING BY BUCKET MACHINE:

A. Provide a suitable container to receive the materials dumped from the buckets and return liquids to the sewer without spillage.

3.04 CLEANING OF MANHOLES:

A. All manholes within the wastewater line sections designated to be cleaned shall have the walls and floor thoroughly cleaned to the bare masonry and concrete by means of the specified high velocity jet gun. If manhole has an existing liner (i.e. epoxy liner), Contractor shall ensure cleaning and jetting operation does not damage existing liner.

Collect debris in manhole that is cleaned. Do not allow debris to flow into sewer system. When manholes are located in reaches of wastewater lines to be cleaned, both the first upstream manhole and the last downstream manhole in each system as well as all intermediate manholes shall be included in the wastewater line cleaning operation.

3.05 DISPOSAL OF REFUSE:

A. Dispose of dewatered sludge, sand and other solid material that results from the cleaning at a State approved sanitary landfill site.

B. Owner will provide a designated debris drying pad that the Contractor can use to dewater the material. Liquid must be decanted prior to dumping material at Owner provided site.

C. Comply with State of North Carolina, County, and local regulations, rules, and ordinances regarding the disposal of such materials. If Contractor does not comply with rules and regulations, Contractor shall pay fees and fines arising from the disposal of the materials.

Raleigh Water 33 01 30.11-4 Sewer Line Cleaning

Updated: April 2020

3.06 UNKNOWN OBSTRUCTIONS STOPPING CLEANING PROCESS:

A. Obstructions such as concrete in joints or badly collapsed pipe may exist that will prevent completing cleaning work. If this should occur, notify the Engineer of the condition and provide recommendation for repair. Engineer will make an assessment of the condition and provide instruction for further rehabilitation work as appropriate.

3.07 BY-PASSING OF SEWER

A. There will be no by-passing of sewage to any surface outside the sewer system.

3.08 TV INSPECTION

A. Visually inspect sewer line reaches designated by means of closed-circuit television.

Perform inspection on one manhole section at a time in accordance with National Association of Sewer Service Companies (NASSCO) Pipeline Assessment and Certification (PACP) standards. The inspection report shall be in NASSCO PACP v.7 Database format and recorded onto external hard drive, thumb drive, or cloud-based server as agreed upon by Contractor and City of Raleigh Public Utilities Department (CORPUD). All inspection reports and photographs shall become the property of

CORPUD.

B. Inspection shall closely follow cleaning operation.

C. Television camera used for the inspection shall be one specifically designed and constructed for such inspection. Lighting for the camera shall be suitable to allow a clear picture for the entire periphery of the pipe. Camera shall be operative in 100 percent humidity conditions. Components of the video system shall be capable of producing a high-resolution (minimum 300 line) images and video. Lighting system shall minimize reflective glare.

D. Move camera through the line in either direction at a uniform rate, but in no case at a speed greater than 30 feet per minute. Stop camera when necessary to insure proper documentation of the sewer’s condition. Camera cables shall not obstruct the camera view or interfere with proper documentation of the sewer. If the camera will not pass through the entire sewer section, re-set the equipment to allow inspection from the opposite manhole.

E. If the camera again fails to pass through the entire section,

1. For pre-installation inspection of sewer pipe to be CIPP lined, notify the City of

Raleigh and perform point repairs, cut protruding service connections or clean to remove roots.

2. For post-installation inspection of new sewer pipe or CIPP lining, perform point repairs, cut protruding service connections or clean to remove roots.

F. There will be no additional cost to the Owner if re-cleaning is required. Point repairs and hammer tap repairs will be paid at the contract unit price.

G. Whenever non-remote powered and controlled winches are used to pull the television camera through the line, suitable means of communication shall be set up between the two manholes of the inspected section to insure that good communications exist between members of the crew.

H. Measurement for location of defects shall be above ground by means of a meter device. Marking on cable which would require interpolation for depth of manhole, will

Raleigh Water 33 01 30.11-5 Sewer Line Cleaning

Updated: April 2020 not be allowed. Measurement meters will be accurate to two tenths (0.2) of a foot over the length of the section being inspected. Accuracy of the measurement meters shall be checked daily by use of a walking meter, roll-a-tape or other suitable device.

I. Prepare and maintain printed location records that clearly show the location, in relation to adjacent manholes, of each service lateral connection and defect requiring repair.

During each inspection, make visual and audio recordings of the data on the television monitor onto external hard drive, thumb drive, or cloud-based server as agreed upon by Contractor and CORPUD. Label copies of the recordings and logs as to the content.

Labels shall include the sewer segment reach designation, street location and manhole facility identifications numbers on the tape. Contractor shall obtain most current manhole ID numbers from City before CCTV.

J. Contractor required to conduct CCTV during low flow periods (overnight) if flow in pipe is too high during normal working hours. If bypass pumping is required, notify Owner and Engineer.

END OF SECTION