ONTARIO PROVINCIAL STANDARD SPECIFICATION METRIC OPSS 404 NOVEMBER 2010 CONSTRUCTION SPECIFICATION FOR SUPPORT SYSTEMS TABLE OF CONTENTS 404.01 SCOPE 404.02 REFERENCES 404.03 DEFINITIONS 404.04 DESIGN AND SUBMISSION REQUIREMENTS 404.05 MATERIALS - Not Used 404.06 EQUIPMENT - Not Used 404.07 CONSTRUCTION 404.08 QUALITY ASSURANCE - Not Used 404.09 MEASUREMENT FOR PAYMENT 404.10 BASIS OF PAYMENT APPENDICES 404-A Commentary 404.01 SCOPE This specification covers the requirements for supplying, placing, maintaining, and removing support systems required to permit the excavation and backfilling of trenches or excavations for the installation of sanitary and storm pipe sewers, pipe culverts and end sections, forcemains and associated appurtenances, watermains and associated appurtenances, and other underground Utilities; maintenance holes, catch basins, ditch inlets, and valve chambers; and any other specified subsurface construction. 404.01.01 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: 11/2010 OPSS 404
404.01.02 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. 404.02 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. Ontario Provincial Standard Specifications, Construction OPSS 412 OPSS 441 Sewage Forcemain Installation in Open Cut Watermain Installation in Open Cut Provincial Statute Occupational Health and Safety Act R.S.O. 1990, c. O.1, as amended Ontario Regulations 213/91 - Regulations for Construction Projects, as amended 404.03 DEFINITIONS For the purpose of this specification, the following definitions apply: Associated Appurtenances mean as defined in OPSS 412 and OPSS 441. Page 2 Rev. Date: 11/2010 OPSS 404
Sheathing means the vertical members of the support system that are placed up against the walls of an excavation to directly resist the pressure exerted from the walls of the excavation. Sheathing may be either wood or steel sheet piling. Support Systems means as described in the Occupational Health and Safety Act and Regulations for Construction Projects. Trench means the definition as provided in the Occupational Health and Safety Act and Regulations for Construction Projects. 404.04 DESIGN AND SUBMISSION REQUIREMENTS 404.04.01 Submission Requirements 404.04.01.01 Pre-Condition Survey When specified in the Contract Documents, a pre-condition survey shall be prepared for all buildings, Utilities, structures, roadway infrastructure, and facilities within 30 m of the location where the support system is to be installed. The pre-condition survey shall include, as a minimum: existing structural and cosmetic damage or defects. A copy of the pre-condition survey shall be provided to the Contract Administrator upon request. 404.07 CONSTRUCTION 404.07.01 General Support systems shall be supplied, placed, and maintained at the locations and elevations that are necessary or required to: a) support and protect the sides and bottom of the excavation. b) prevent undue disturbance or weakening of the supporting material below or beside the works. c) prevent movement of ground which may disturb or damage the works, adjacent pavements, property, structures, or other works. 404.07.02 Installation Support systems shall be placed so they can be removed as backfilling takes place without damage to the works and without settlement of or damage to adjacent pavements, property, structures, or other works. 404.07.03 Removal, Backfilling, and Compacting As the excavation is backfilled, the support system shall be removed, unless it is specified in the Contract Documents to be left in place or approved by the Contract Administrator. Support systems shall be withdrawn gradually as backfilling progresses. Backfill shall be placed and compacted in a manner that fills the voids left by pulled support systems. The procedure for extracting the support system and placing backfill shall ensure the backfill load is applied gradually and disturbance of the works or foundation material is avoided. Page 3 Rev. Date: 11/2010 OPSS 404
Backfill shall be placed and compacted around and over the support systems left in place. Support systems left in place shall be cut off as specified in the Contract Documents. 404.07.04 Management of Excess Material Management of excess material shall be according to the Contract Documents. 404.09 MEASUREMENT FOR PAYMENT 404.09.01 Actual Measurement 404.09.01.01 Support System Left in Place Measurement for support systems left in place shall be based on the sheathing area for all sides of the excavation in square metres according to the following: a) Height The vertical distance of the sheathing actually left in place. If the sheathing is cut off less than 1,200 mm from its top then the actual vertical height placed shall be used. b) Length The horizontal distance along the line of the supported excavation from the beginning to the end of the sheathing left in place. 404.10 BASIS OF PAYMENT 404.10.01 Support Systems Payment at the Contract price for the appropriate tender items for the installation of sanitary and storm pipe sewers, pipe culverts and end sections, forcemains and associated appurtenances, watermains and associated appurtenances, and other underground Utilities; maintenance holes, catch basins, ditch inlets or valve chambers; and any other specified subsurface construction shall include full compensation for all labour, Equipment, and Material to do the work. 404.10.02 Support Systems Left in Place - Item Payment at the Contract price for the above tender item shall be full compensation for all Material left in place. No additional payment shall be made for support systems left in place at the Contractor's option. Page 4 Rev. Date: 11/2010 OPSS 404
Appendix 404-A, November 2010 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 may consider including soil boring data, a geotechnical report, a subsurface report, or a soils report in the Tender Documents. The designer should specify the following in the Contract Documents: - If the support system is to be left in place and the cut-off elevation. (404.07.03) The designer should determine if a pre-condition survey is required and, if so, the need should be specified in the Contract Documents. (404.04.01) The designer should ensure that the General Conditions of Contract and the 100 Series General Specifications are included in the Contract Documents. Related Ontario Provincial Standard Drawings OPSD 802.010 to 802.014 OPSD 802.020 to 802.024 OPSD 802.030 to 802.034 OPSD 802.050 to 802.054 Flexible Pipe Embedment and Backfill Flexible Pipe Arch Embedment and Backfill Rigid Pipe Bedding, Cover, and Backfill Horizontal Elliptical Rigid Pipe Bedding, Cover, and Backfill Page 5 Rev. Date: 11/2010 OPSS 404