CONSTRUCTION SPECIFICATION FOR THE CLEANING AND FLUSHING OF PIPE SEWERS, CATCHBASINS, MAINTENANCE HOLES, DITCH INLETS, AND OIL-GRIT SEPARATORS

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1 ONTARIO PROVINCIAL STANDARD SPECIFICATION METRIC OPSS 411 NOVEMBER 2015 CONSTRUCTION SPECIFICATION FOR THE CLEANING AND FLUSHING OF PIPE SEWERS, CATCHBASINS, MAINTENANCE HOLES, DITCH INLETS, AND OIL-GRIT SEPARATORS TABLE OF CONTENTS SCOPE REFERENCES DEFINITIONS DESIGN AND SUBMISSION REQUIREMENTS MATERIALS EQUIPMENT CONSTRUCTION QUALITY ASSURANCE Not Used MEASUREMENT FOR PAYMENT BASIS OF PAYMENT APPENDICES 411-A Commentary SCOPE This specification covers the requirements for the cleaning and flushing of pipe sewers, catchbasins, maintenance holes, ditch inlets, and oil-grit separators Specification Significance and Use This specification has been developed for use in provincial- and municipal-oriented Contracts. The administration, testing, and payment policies, procedures, and practices reflected in this specification correspond to those used by many municipalities and the Ontario Ministry of Transportation. Use of this specification or any other specification shall be according to the Contract Documents. Page 1 Rev. Date: 11/2015 OPSS 411

2 Appendices Significance and Use Appendices are not for use in provincial contracts as they are developed for municipal use, and then, only when invoked by the Owner. Appendices are developed for the Owner s use only. Inclusion of an appendix as part of the Contract Documents is solely at the discretion of the Owner. Appendices are not a mandatory part of this specification and only become part of the Contract Documents as the Owner invokes them. Invoking a particular appendix does not obligate an Owner to use all available appendices. Only invoked appendices form part of the Contract Documents. The decision to use any appendix is determined by an Owner after considering their contract requirements and their administrative, payment, and testing procedures, policies, and practices. Depending on these considerations, an Owner may not wish to invoke some or any of the available appendices REFERENCES When the Contract Documents indicate that provincial-oriented specifications are to be used and there is a provincial-oriented specification of the same number as those listed below, references within this specification to an OPSS shall be deemed to mean OPSS.PROV, unless use of a municipal-oriented specification is specified in the Contract Documents. When there is not a corresponding provincialoriented specification, the references below shall be considered to be to the OPSS listed, unless use of a municipal-oriented specification is specified in the Contract Documents. When the Contract Documents indicate that municipal-oriented specifications are to be used and there is a municipal-oriented specification of the same number as those listed below, references within this specification to an OPSS shall be deemed to mean OPSS.MUNI, unless use of a provincial-oriented specification is specified in the Contract Documents. When there is not a corresponding municipaloriented specification, the references below shall be considered to be the OPSS listed, unless use of a provincial-oriented specification is specified in the Contract Documents. This specification refers to the following standards, specifications, or publications: Ontario Provincial Standard Specifications, Construction OPSS 409 OPSS 410 Closed-Circuit Television Inspection of Sewers Pipe Sewer Installation in Open Cut DEFINITIONS For the purpose of this specification, the following definitions apply: Air Gap Method means a clear vertical separation between the pressurized potable water supply and a non-pressurized, non-potable water receiving vessel. Backflow Prevention means a device used to protect potable water supplies from contamination or pollution due to backflow. Cleaning means suction and vacuuming removal of debris within pipe sewers, catchbasins, maintenance holes, ditch inlets, and oil-grit separators. Page 2 Rev. Date: 11/2015 OPSS 411

3 Combination Hydro-Jet Cleaner means a service vehicle or equipment capable of pressure washing, suction vacuum cleaning of debris. Debris means sludge, dirt, sand, gravel, rocks, bricks, other solid and semi-solid materials, and roots, grease, and encrustations and other materials that may cause restriction to flow in pipe sewers, catchbasins, maintenance holes, ditch inlets, and oil-grit separators. Flushing means hydraulic pressure washing using various nozzles, pressure and flow rates to flush debris within pipe sewer systems downstream. Oil-grit separator means a device designed to separate oil and suspended solids from water. Pipe Sewer means as defined in OPSS DESIGN AND SUBMISSION REQUIREMENTS When Equipment requiring an environmental compliance approval for a waste management system, issued by the Ontario Ministry of Environment and Climate Change, will be used for the work, a copy of the environmental compliance approval shall be submitted to the Contract Administrator a minimum of two weeks prior to commencement of the work MATERIALS Water Source Water source shall be as specified in the Contract Documents. When the source is not specified, water shall be clean and free from oil, acid, alkali, organic matter, or other deleterious substances. Backflow prevention and air gap methods shall be used when water is taken from potable water systems EQUIPMENT Combination Hydro-Jet Cleaner A combination hydro-jet cleaner specifically designed for the purpose of cleaning pipe sewers, catch basins, maintenance holes, ditch inlets, oil-grit separators, and similar facilities, using a selection of nozzles and attachments to permit reaming and root cutting as required, shall be used for the work. The equipment shall be sufficient to clear blockages and remove debris from pipe sewer systems with varied sizes and downstream constraints CONSTRUCTION General The work shall commence at the upstream end of pipe sewer systems and progress to the downstream end. The conditions of the site and the pipe sewer system shall be thoroughly assessed, including the degree of pipe blockage and types of debris. The equipment, nozzles, flow rates, and pressures necessary to complete the work shall be determined. Any supplemental information regarding the sewer network and the assessment method shall be as specified in the Contract Documents. Page 3 Rev. Date: 11/2015 OPSS 411

4 For post installation inspections, sewers requiring cleaning and flushing shall be as specified in the Contract Documents. The Owner may request additional documentation of findings after cleaning and flushing operations as specified in the Contract Documents. Prior to using any mechanical equipment, verify with CCTV inspections if any utility clearance is required. Water flow volumes and pressures shall not cause damage to the pipe sewer system or flooding of property. Water flow volumes and pressures shall be appropriate for the age and condition of the pipe sewer system. Debris that cannot be removed by flushing shall be loosened and broken up using reamers and root cutters as required. No blockage to service connections shall occur as a result of the cleaning and flushing or cleanout operation. Protection of waterbodies and waterbody banks shall be as specified in the Contract Documents Pipe Sewer Cleaning and Flushing Flushing shall be used to transport debris from each section of pipe sewer to the downstream maintenance hole or catchbasin. Each section of pipe sewer between maintenance holes, catch basins, ditch inlets shall be cleaned and flushed before cleaning and flushing the next downstream section. Debris shall be continuously cleaned from the downstream maintenance hole or catchbasin as flushing occurs. The passage of debris from one section of pipe sewer to another shall not be permitted, unless specified in the Contract Documents. A weir or sediment trap shall be placed in the maintenance hole to prevent passage of debris from the upstream pipes. When cleaning and flushing is completed for each section, the weir or sediment trap shall be removed. Cleaning and flushing shall continue for each section of pipe sewer until no further debris is flushed from the pipe, and the pipe sewer section is free of impediments to flow. A minimum of 90% of the pipe sewer circumference shall be free of debris. If cleanout cannot be completed due to damaged or broken pipe sewer, catchbasin, maintenance hole, or ditch inlet, the Contract Administrator shall be immediately notified Catchbasin, Maintenance hole, and Ditch Inlet Cleanout A combination hydro-jet cleaner shall remove debris from catchbasins, maintenance holes, and ditch inlets separately Oil-Grit Separator Cleanout Oil-grit separators shall be cleaned out by closing or blocking off the inlet and outlet pipes, dewatering the system, removal of debris by vacuum or other mechanical means, and cleaning and flushing to remove sediment. The inlet and outlet pipes shall not be reopened or unblocked until after the separator has been inspected by the Contract Administrator. Page 4 Rev. Date: 11/2015 OPSS 411

5 Closed-Circuit Television Inspection Unless otherwise specified in the Contract Documents, pipe sewers shall be inspected after cleaning by closed-circuit television (CCTV) according to OPSS 409. The Contract Administrator shall be notified a minimum 24 hours prior to the inspection. When specified in the Contract Documents, water shall be added immediately prior to CCTV inspection to the upstream end of the sewer system for minimum flow to the system low point by gravity Management of Excess Material Management of excess material shall be according to the Contract Documents. Debris removed from pipe sewers, catchbasins, maintenance holes, ditch inlets, and oil-grit separators shall be managed as excess material according to the Contract Documents. Liquid shall be decanted or filtered and returned to the sewer of origin. The decanted or filtered liquid shall comply with Provincial Water Quality Objectives and local municipal bylaws MEASUREMENT FOR PAYMENT Actual Measurement Pipe Sewer Cleaning and Flushing Measurement for pipe sewer cleaning and flushing shall be by length in metres, by time in hours, or by volume in cubic metres, as specified in the Contract Documents By Length Measurement shall be in metres and along the centreline of the pipe sewer from the centre of the maintenance hole, catch basin, or ditch inlet at each end of the pipe sewer system to be cleaned out. When cleaning and flushing is incomplete due to a collapsed pipe or immovable blockage, the length of collapsed pipe or blockage shall be deducted from the length measured for payment By Time Measurement shall be by time in hours that the combination hydro-jet cleaner is in effective operation By Volume Measurement shall be by volume in cubic metres of decanted debris, in predetermined truck box capacities Catchbasin, Maintenance Hole, Ditch Inlet, and Oil-Grit Separator Cleanout For measurement purposes, a count shall be made of the number of structures cleaned Plan Quantity Measurement When measurement is by Plan Quantity, such measurement shall be based on the units shown in the clause under Actual Measurement. Page 5 Rev. Date: 11/2015 OPSS 411

6 BASIS OF PAYMENT Pipe Sewer Cleaning and Flushing Item Catchbasin, Maintenance Hole, Ditch Inlet Cleanout, and Oil-Grit Separator Cleanout Item Payment at the Contract price for the above tender item shall be full compensation for all labour, Equipment, and Material to do the work. Page 6 Rev. Date: 11/2015 OPSS 411

7 Appendix 411-A, November 2015 FOR USE WHILE DESIGNING MUNICIPAL CONTRACTS Note: This is a non-mandatory Commentary Appendix intended to provide information to a designer, during the design stage of a contract, on the use of the OPS specification in a municipal contract. This appendix does not form part of the standard specification. Actions and considerations discussed in this appendix are for information purposes only and do not supersede an Owner s design decisions and methodology. Designer Action/Considerations The designer should specify the following in the Contract Documents: - The owner shall provide any available information on the condition of the sewer network (e.g. size, age, constraints, material, known defects, vulnerable sections). ( ) - The owner may choose to evaluate, specify or approve the assessment method of pipe prior to work. ( ) - For post installation inspections, the owner shall identify sewers requiring flushing and cleaning ( ) - If access to the waterbody or a waterbody bank is required, necessary protection measures shall be specified ( ) - The individual owners may request documentation of findings after flushing completion (e.g. presence of grease, roots, construction debris, pipe defect and; an estimate of the light/medium/heavy level of material removed, where applicable; and submission of inspection reports and maps) ( ) - The owner shall identify if passing material between maintenance holes will be permitted ( ) - The owner shall designate if CCTV inspection is not required ( ) - The owner shall designate if additional water for minimum flow is required prior to the camera inspection (411.05) - The owner shall designate water source where applicable including any metering or tracking if required ( ) - The owner shall designate disposal sites where applicable, designating as temporary or permanent, as necessary, including any additional environmental requirements ( ) - Method of measurement for pipe sewer cleaning and flushing. ( ) Related Ontario Provincial Standard Drawings No information provided here. Page 7 Rev. Date: 11/2015 OPSS 411

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