We appreciate the thorough…

We appreciate the thorough and detailed work put toward the development of these standards, and the opportunity to provide feedback. Comments/suggestions for each standard are detailed below and in the attached document. Thanks.

OPSS 960: Construction Specification for Buried Corrugated Steel Structures with Span Greater

960.03 Engineered Fill Definition - Add clarification that Engineered Fill shall be placed adjacent to, and over top of the structure to the limits specified by the structure design. This typically refers to zone 1 and 2 as detailed in section 7.6.7.3 if CHBDC 2025.
960.04.02.01 h) "Suggest rewording slightly:
. Bedding, Backfill, Engineered Backfill:
(1) type of material to be used,
(2) method of installation,
(3) material chemical properties for engineered backfill including PH, Resistivity, Sulphates, Chlorides, and Organics content.
(4) material unit weight,
(5) material test results and gradation, according to OPSS 1010. "
960.05.08 Granular cover shall be engineered fill to the elevation specified by the structure design. Alternative fill material may be used above engineered fill zone, and below the road base, if accounted for in the structure design, and at the discretion of the contract administrator.
960.07.10 A request to proceed, and notice to proceed is required after inspection of subgrade, and placement of bedding. These operations may be performed in the same day. Suggest combining inspection of subgrade and placement of bedding (if applicable) into one request to proceed.
960.07.11 The width of uncompacted bedding for closed bottom structures is typcally span/2 and may vary for pipe arches depending on radii. Suggest noting that the bedding width shall be specified on the design drawings.
960.07.13 The "valley bolt closest to visible edge" rule only applies to SPCSP. Suggest clarifying that SPCSP (152x51 corrugation) shall be bolted with the valley bolt closet to the visible edge. All structures shall be bolted per manufacturer requirements.
960.07.13 Bolt torque is typically 200 to 340 Nm for 19mm bolts. Higher torque is required for 22mm bolts. Suggest adding text to clarify this. Bolt torque requirements are specified on working drawings, ref. 960.04.02.01 f).
960.07.13 Does variations in alignment refer to the overall position and placement of the structure relative to the intended surveyed location, or changes in the vertical and horizontal alignment over the length of the structure? Suggest clarifying. If this intended to check alignment, suggest a tolerance of 1% along the length in the vertical or horizontal direction. 300mm change in horizontal alignment could impact assembly and performance of some structures.
960.07.13 dimensional tolerances of 1:1800 or 5mm are more stringent than what is practical for these types of structures. For example, where two 5mm plates are lapped, this limit is already met. Suggest removing this paragraph as limits reflective of bridge code values are already provided above. Suggest adding a line that additional project specific or manufacture tolerances may apply.
960.07.16.01 Suggest adding a note that more stringent tolerances may be specified in the working drawings.

CAIS No. 960: Administration and Inspection Activities for Buried Corrugated Steel Structures with Span Greater than 3.0 m

940.02.01 or 960.05.05 Check backfill unit weight test results are less than or equal to the unit weight assumed for the design.
940.02.01 or 960.05.05 Check engineered fill chemical properties meets the limits for the specified coating.
960.07.13 Bolt torque is typically 200 to 340 Nm for 19mm bolts. Higher torque is required for 22mm bolts. Suggest adding text to clarify this. Bolt torque requirements are specified on working drawings, ref. 960.04.02.01 f).

CDED B960: Detail Estimating

960.1.2 Where water contact is anticipated, water chemical testing to determine values for PH, resistivity, chlorides, hardness, and sulphate should be obtained to determine the exposure conditions defined in CSA S6, section 2. The soil exposure condition can typically be considered non-aggressive, and can be confirmed through testing of the engineered fill prior to construction.
960.7.3.8 mentions concrete culvert. Should reference buried corrugated metal structures, and differential settlement limits outlined in CSA S6 section 7.
960.9.1 "Contract drawing requirements - for information includes on the contract drawings, add: Corrugation profile, material thickness, coating requirement, design live load, fill unit weight, minimum and maximum design cover heights.
Consider using a fill unit weight of 23.5 kN/m3. This is heavier than CHBDC default of 22, but is more conservative, and fill weights (accounting for moisture content) heavier than 22 are common in Ontario. Making design or source pit changes after award of tender could add costs and risks to the project. "

OPSS.PROV 1805: Material Specification for Corrugated Steel Structural Plate

1805.05.01 Min. steel thickness of 5mm. Use of a thinner steel, particularly when coated with a copolymer, can provide a cost saving option while still meeting 75 year CHBDC design life criteria, or where a 75 year life is not required. Consider removing this limitation for "MUNI" versions of this standard.

1805.07.06 Storage - Storage of plates in a climate controlled facility is not always practical. Storage concerns are generally limited to galvanized coating, additional information can be found in CSPI technical bulletin 28. Suggest the following alternative text: Fabricated and coated plates stored outside for extended period of time during the winter shall be raised off the ground, spaced to allow airflow between plates, stacked to avoid standing water, and covered or wrapped for environmental protection.

CAIS 1805

1805.07.06 See storage comment above.